X-Git-Url: http://git.maemo.org/git/?p=mafwsubrenderer;a=blobdiff_plain;f=gst-plugins-base-subtitles0.10%2Fgst%2Fplayback%2Fgstdecodebin2.c;fp=gst-plugins-base-subtitles0.10%2Fgst%2Fplayback%2Fgstdecodebin2.c;h=31b5ebba8afeffcddad214efd9fd5fbae3c45ba9;hp=0000000000000000000000000000000000000000;hb=57ba96e291a055f69dbfd4ae9f1ae2390e36986e;hpb=be2c98fb83895d10ac44af7b9a9c3e00ca54bf49 diff --git a/gst-plugins-base-subtitles0.10/gst/playback/gstdecodebin2.c b/gst-plugins-base-subtitles0.10/gst/playback/gstdecodebin2.c new file mode 100644 index 0000000..31b5ebb --- /dev/null +++ b/gst-plugins-base-subtitles0.10/gst/playback/gstdecodebin2.c @@ -0,0 +1,3738 @@ +/* GStreamer + * Copyright (C) <2006> Edward Hervey + * Copyright (C) <2009> Sebastian Dröge + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +/** + * SECTION:element-decodebin2 + * + * #GstBin that auto-magically constructs a decoding pipeline using available + * decoders and demuxers via auto-plugging. + * + * decodebin2 is considered stable now and replaces the old #decodebin element. + * #uridecodebin uses decodebin2 internally and is often more convenient to + * use, as it creates a suitable source element as well. + */ + +/* Implementation notes: + * + * The following section describes how decodebin2 works internally. + * + * The first part of decodebin2 is its typefind element, which tries + * to determine the media type of the input stream. If the type is found + * autoplugging starts. + * + * decodebin2 internally organizes the elements it autoplugged into GstDecodeChains + * and GstDecodeGroups. A decode chain is a single chain of decoding, this + * means that if decodebin2 every autoplugs an element with two+ srcpads + * (e.g. a demuxer) this will end the chain and everything following this + * demuxer will be put into decode groups below the chain. Otherwise, + * if an element has a single srcpad that outputs raw data the decode chain + * is ended too and a GstDecodePad is stored and blocked. + * + * A decode group combines a number of chains that are created by a + * demuxer element. All those chains are connected through a multiqueue to + * the demuxer. A new group for the same demuxer is only created if the + * demuxer has signaled no-more-pads, in which case all following pads + * create a new chain in the new group. + * + * This continues until the top-level decode chain is complete. A decode + * chain is complete if it either ends with a blocked endpad, if autoplugging + * stopped because no suitable plugins could be found or if the active group + * is complete. A decode group on the other hand is complete if all child + * chains are complete. + * + * If this happens at some point, all endpads of all active groups are exposed. + * For this decodebin2 adds the endpads, signals no-more-pads and then unblocks + * them. Now playback starts. + * + * If one of the chains that end on a endpad receives EOS decodebin2 checks + * if all chains and groups are drained. In that case everything goes into EOS. + * If there is a chain where the active group is drained but there exist next + * groups, the active group is hidden (endpads are removed) and the next group + * is exposed. This means that in some cases more pads may be created even + * after the initial no-more-pads signal. This happens for example with + * so-called "chained oggs", most commonly found among ogg/vorbis internet + * radio streams. + * + * Note 1: If we're talking about blocked endpads this really means that the + * *target* pads of the endpads are blocked. Pads that are exposed to the outside + * should never ever be blocked! + * + * Note 2: If a group is complete and the parent's chain demuxer adds new pads + * but never signaled no-more-pads this additional pads will be ignored! + * + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include + +#include +#include +#include + +#include "gstplay-marshal.h" +#include "gstplay-enum.h" +#include "gstplayback.h" +#include "gstrawcaps.h" + +/* generic templates */ +static GstStaticPadTemplate decoder_bin_sink_template = +GST_STATIC_PAD_TEMPLATE ("sink", + GST_PAD_SINK, + GST_PAD_ALWAYS, + GST_STATIC_CAPS_ANY); + +static GstStaticPadTemplate decoder_bin_src_template = +GST_STATIC_PAD_TEMPLATE ("src%d", + GST_PAD_SRC, + GST_PAD_SOMETIMES, + GST_STATIC_CAPS_ANY); + +GST_DEBUG_CATEGORY_STATIC (gst_decode_bin_debug); +#define GST_CAT_DEFAULT gst_decode_bin_debug + +typedef struct _GstPendingPad GstPendingPad; +typedef struct _GstDecodeChain GstDecodeChain; +typedef struct _GstDecodeGroup GstDecodeGroup; +typedef struct _GstDecodePad GstDecodePad; +typedef GstGhostPadClass GstDecodePadClass; +typedef struct _GstDecodeBin GstDecodeBin; +typedef struct _GstDecodeBin GstDecodeBin2; +typedef struct _GstDecodeBinClass GstDecodeBinClass; + +#define GST_TYPE_DECODE_BIN (gst_decode_bin_get_type()) +#define GST_DECODE_BIN_CAST(obj) ((GstDecodeBin*)(obj)) +#define GST_DECODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DECODE_BIN,GstDecodeBin)) +#define GST_DECODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DECODE_BIN,GstDecodeBinClass)) +#define GST_IS_DECODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DECODE_BIN)) +#define GST_IS_DECODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DECODE_BIN)) + +/** + * GstDecodeBin2: + * + * The opaque #DecodeBin2 data structure + */ +struct _GstDecodeBin +{ + GstBin bin; /* we extend GstBin */ + + /* properties */ + GstCaps *caps; /* caps on which to stop decoding */ + gchar *encoding; /* encoding of subtitles */ + gboolean use_buffering; /* configure buffering on multiqueues */ + gint low_percent; + gint high_percent; + guint max_size_bytes; + guint max_size_buffers; + guint64 max_size_time; + gboolean post_stream_topology; + + GstElement *typefind; /* this holds the typefind object */ + + GMutex *expose_lock; /* Protects exposal and removal of groups */ + GstDecodeChain *decode_chain; /* Top level decode chain */ + gint nbpads; /* unique identifier for source pads */ + + GMutex *factories_lock; + guint32 factories_cookie; /* Cookie from last time when factories was updated */ + GList *factories; /* factories we can use for selecting elements */ + + GMutex *subtitle_lock; /* Protects changes to subtitles and encoding */ + GList *subtitles; /* List of elements with subtitle-encoding, + * protected by above mutex! */ + + gboolean have_type; /* if we received the have_type signal */ + guint have_type_id; /* signal id for have-type from typefind */ + + gboolean async_pending; /* async-start has been emited */ + + GMutex *dyn_lock; /* lock protecting pad blocking */ + gboolean shutdown; /* if we are shutting down */ + GList *blocked_pads; /* pads that have set to block */ + + gboolean expose_allstreams; /* Whether to expose unknow type streams or not */ +}; + +struct _GstDecodeBinClass +{ + GstBinClass parent_class; + + /* signal we fire when a new pad has been decoded into raw audio/video */ + void (*new_decoded_pad) (GstElement * element, GstPad * pad, gboolean last); + /* signal we fire when a pad has been removed */ + void (*removed_decoded_pad) (GstElement * element, GstPad * pad); + /* signal fired when we found a pad that we cannot decode */ + void (*unknown_type) (GstElement * element, GstPad * pad, GstCaps * caps); + + /* signal fired to know if we continue trying to decode the given caps */ + gboolean (*autoplug_continue) (GstElement * element, GstPad * pad, + GstCaps * caps); + /* signal fired to get a list of factories to try to autoplug */ + GValueArray *(*autoplug_factories) (GstElement * element, GstPad * pad, + GstCaps * caps); + /* signal fired to sort the factories */ + GValueArray *(*autoplug_sort) (GstElement * element, GstPad * pad, + GstCaps * caps, GValueArray * factories); + /* signal fired to select from the proposed list of factories */ + GstAutoplugSelectResult (*autoplug_select) (GstElement * element, + GstPad * pad, GstCaps * caps, GstElementFactory * factory); + + /* fired when the last group is drained */ + void (*drained) (GstElement * element); +}; + +/* signals */ +enum +{ + SIGNAL_NEW_DECODED_PAD, + SIGNAL_REMOVED_DECODED_PAD, + SIGNAL_UNKNOWN_TYPE, + SIGNAL_AUTOPLUG_CONTINUE, + SIGNAL_AUTOPLUG_FACTORIES, + SIGNAL_AUTOPLUG_SELECT, + SIGNAL_AUTOPLUG_SORT, + SIGNAL_DRAINED, + LAST_SIGNAL +}; + +/* automatic sizes, while prerolling we buffer up to 2MB, we ignore time + * and buffers in this case. */ +#define AUTO_PREROLL_SIZE_BYTES 2 * 1024 * 1024 +#define AUTO_PREROLL_SIZE_BUFFERS 0 +#define AUTO_PREROLL_SIZE_TIME 0 + +/* whan playing, keep a max of 2MB of data but try to keep the number of buffers + * as low as possible (try to aim for 5 buffers) */ +#define AUTO_PLAY_SIZE_BYTES 2 * 1024 * 1024 +#define AUTO_PLAY_SIZE_BUFFERS 5 +#define AUTO_PLAY_SIZE_TIME 0 + +#define DEFAULT_SUBTITLE_ENCODING NULL +#define DEFAULT_USE_BUFFERING FALSE +#define DEFAULT_LOW_PERCENT 10 +#define DEFAULT_HIGH_PERCENT 99 +/* by default we use the automatic values above */ +#define DEFAULT_MAX_SIZE_BYTES 0 +#define DEFAULT_MAX_SIZE_BUFFERS 0 +#define DEFAULT_MAX_SIZE_TIME 0 +#define DEFAULT_POST_STREAM_TOPOLOGY FALSE +#define DEFAULT_EXPOSE_ALL_STREAMS TRUE + +/* Properties */ +enum +{ + PROP_0, + PROP_CAPS, + PROP_SUBTITLE_ENCODING, + PROP_SINK_CAPS, + PROP_USE_BUFFERING, + PROP_LOW_PERCENT, + PROP_HIGH_PERCENT, + PROP_MAX_SIZE_BYTES, + PROP_MAX_SIZE_BUFFERS, + PROP_MAX_SIZE_TIME, + PROP_POST_STREAM_TOPOLOGY, + PROP_EXPOSE_ALL_STREAMS, + PROP_LAST +}; + +static GstBinClass *parent_class; +static guint gst_decode_bin_signals[LAST_SIGNAL] = { 0 }; + +static GstStaticCaps default_raw_caps = GST_STATIC_CAPS (DEFAULT_RAW_CAPS); + +static void do_async_start (GstDecodeBin * dbin); +static void do_async_done (GstDecodeBin * dbin); + +static void type_found (GstElement * typefind, guint probability, + GstCaps * caps, GstDecodeBin * decode_bin); + +static void decodebin_set_queue_size (GstDecodeBin * dbin, + GstElement * multiqueue, gboolean preroll); + +static gboolean gst_decode_bin_autoplug_continue (GstElement * element, + GstPad * pad, GstCaps * caps); +static GValueArray *gst_decode_bin_autoplug_factories (GstElement * + element, GstPad * pad, GstCaps * caps); +static GValueArray *gst_decode_bin_autoplug_sort (GstElement * element, + GstPad * pad, GstCaps * caps, GValueArray * factories); +static GstAutoplugSelectResult gst_decode_bin_autoplug_select (GstElement * + element, GstPad * pad, GstCaps * caps, GstElementFactory * factory); + +static void gst_decode_bin_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec); +static void gst_decode_bin_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec); +static void gst_decode_bin_set_caps (GstDecodeBin * dbin, GstCaps * caps); +static GstCaps *gst_decode_bin_get_caps (GstDecodeBin * dbin); +static void caps_notify_cb (GstPad * pad, GParamSpec * unused, + GstDecodeChain * chain); + +static GstPad *find_sink_pad (GstElement * element); +static GstStateChangeReturn gst_decode_bin_change_state (GstElement * element, + GstStateChange transition); + +#define EXPOSE_LOCK(dbin) G_STMT_START { \ + GST_LOG_OBJECT (dbin, \ + "expose locking from thread %p", \ + g_thread_self ()); \ + g_mutex_lock (GST_DECODE_BIN_CAST(dbin)->expose_lock); \ + GST_LOG_OBJECT (dbin, \ + "expose locked from thread %p", \ + g_thread_self ()); \ +} G_STMT_END + +#define EXPOSE_UNLOCK(dbin) G_STMT_START { \ + GST_LOG_OBJECT (dbin, \ + "expose unlocking from thread %p", \ + g_thread_self ()); \ + g_mutex_unlock (GST_DECODE_BIN_CAST(dbin)->expose_lock); \ +} G_STMT_END + +#define DYN_LOCK(dbin) G_STMT_START { \ + GST_LOG_OBJECT (dbin, \ + "dynlocking from thread %p", \ + g_thread_self ()); \ + g_mutex_lock (GST_DECODE_BIN_CAST(dbin)->dyn_lock); \ + GST_LOG_OBJECT (dbin, \ + "dynlocked from thread %p", \ + g_thread_self ()); \ +} G_STMT_END + +#define DYN_UNLOCK(dbin) G_STMT_START { \ + GST_LOG_OBJECT (dbin, \ + "dynunlocking from thread %p", \ + g_thread_self ()); \ + g_mutex_unlock (GST_DECODE_BIN_CAST(dbin)->dyn_lock); \ +} G_STMT_END + +#define SUBTITLE_LOCK(dbin) G_STMT_START { \ + GST_LOG_OBJECT (dbin, \ + "subtitle locking from thread %p", \ + g_thread_self ()); \ + g_mutex_lock (GST_DECODE_BIN_CAST(dbin)->subtitle_lock); \ + GST_LOG_OBJECT (dbin, \ + "subtitle lock from thread %p", \ + g_thread_self ()); \ +} G_STMT_END + +#define SUBTITLE_UNLOCK(dbin) G_STMT_START { \ + GST_LOG_OBJECT (dbin, \ + "subtitle unlocking from thread %p", \ + g_thread_self ()); \ + g_mutex_unlock (GST_DECODE_BIN_CAST(dbin)->subtitle_lock); \ +} G_STMT_END + +struct _GstPendingPad +{ + GstPad *pad; + GstDecodeChain *chain; + gulong event_probe_id; +}; + +/* GstDecodeGroup + * + * Streams belonging to the same group/chain of a media file + * + * When changing something here lock the parent chain! + */ +struct _GstDecodeGroup +{ + GstDecodeBin *dbin; + GstDecodeChain *parent; + + GstElement *multiqueue; /* Used for linking all child chains */ + gulong overrunsig; /* the overrun signal for multiqueue */ + + gboolean overrun; /* TRUE if the multiqueue signaled overrun. This + * means that we should really expose the group */ + + gboolean no_more_pads; /* TRUE if the demuxer signaled no-more-pads */ + gboolean drained; /* TRUE if the all children are drained */ + + GList *children; /* List of GstDecodeChains in this group */ + + GList *reqpads; /* List of RequestPads for multiqueue, there is + * exactly one RequestPad per child chain */ +}; + +struct _GstDecodeChain +{ + GstDecodeGroup *parent; + GstDecodeBin *dbin; + + GMutex *lock; /* Protects this chain and its groups */ + + GstPad *pad; /* srcpad that caused creation of this chain */ + + gboolean demuxer; /* TRUE if elements->data is a demuxer */ + GList *elements; /* All elements in this group, first + is the latest and most downstream element */ + + /* Note: there are only groups if the last element of this chain + * is a demuxer, otherwise the chain will end with an endpad. + * The other way around this means, that endpad only exists if this + * chain doesn't end with a demuxer! */ + + GstDecodeGroup *active_group; /* Currently active group */ + GList *next_groups; /* head is newest group, tail is next group. + a new group will be created only if the head + group had no-more-pads. If it's only exposed + all new pads will be ignored! */ + GList *pending_pads; /* Pads that have no fixed caps yet */ + + GstDecodePad *endpad; /* Pad of this chain that could be exposed */ + gboolean deadend; /* This chain is incomplete and can't be completed, + e.g. no suitable decoder could be found + e.g. stream got EOS without buffers + */ + GstCaps *endcaps; /* Caps that were used when linking to the endpad + or that resulted in the deadend + */ + + /* FIXME: This should be done directly via a thread! */ + GList *old_groups; /* Groups that should be freed later */ +}; + +static void gst_decode_chain_free (GstDecodeChain * chain); +static GstDecodeChain *gst_decode_chain_new (GstDecodeBin * dbin, + GstDecodeGroup * group, GstPad * pad); +static void gst_decode_group_hide (GstDecodeGroup * group); +static void gst_decode_group_free (GstDecodeGroup * group); +static GstDecodeGroup *gst_decode_group_new (GstDecodeBin * dbin, + GstDecodeChain * chain); +static gboolean gst_decode_chain_is_complete (GstDecodeChain * chain); +static void gst_decode_chain_handle_eos (GstDecodeChain * chain); +static gboolean gst_decode_chain_expose (GstDecodeChain * chain, + GList ** endpads, gboolean * missing_plugin); +static gboolean gst_decode_chain_is_drained (GstDecodeChain * chain); +static gboolean gst_decode_group_is_complete (GstDecodeGroup * group); +static GstPad *gst_decode_group_control_demuxer_pad (GstDecodeGroup * group, + GstPad * pad); +static gboolean gst_decode_group_is_drained (GstDecodeGroup * group); + +static gboolean gst_decode_bin_expose (GstDecodeBin * dbin); + +#define CHAIN_MUTEX_LOCK(chain) G_STMT_START { \ + GST_LOG_OBJECT (chain->dbin, \ + "locking chain %p from thread %p", \ + chain, g_thread_self ()); \ + g_mutex_lock (chain->lock); \ + GST_LOG_OBJECT (chain->dbin, \ + "locked chain %p from thread %p", \ + chain, g_thread_self ()); \ +} G_STMT_END + +#define CHAIN_MUTEX_UNLOCK(chain) G_STMT_START { \ + GST_LOG_OBJECT (chain->dbin, \ + "unlocking chain %p from thread %p", \ + chain, g_thread_self ()); \ + g_mutex_unlock (chain->lock); \ +} G_STMT_END + +/* GstDecodePad + * + * GstPad private used for source pads of chains + */ +struct _GstDecodePad +{ + GstGhostPad parent; + GstDecodeBin *dbin; + GstDecodeChain *chain; + + gboolean blocked; /* the *target* pad is blocked */ + gboolean exposed; /* the pad is exposed */ + gboolean drained; /* an EOS has been seen on the pad */ +}; + +GType gst_decode_pad_get_type (void); +G_DEFINE_TYPE (GstDecodePad, gst_decode_pad, GST_TYPE_GHOST_PAD); +#define GST_TYPE_DECODE_PAD (gst_decode_pad_get_type ()) +#define GST_DECODE_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DECODE_PAD,GstDecodePad)) + +static GstDecodePad *gst_decode_pad_new (GstDecodeBin * dbin, GstPad * pad, + GstDecodeChain * chain); +static void gst_decode_pad_activate (GstDecodePad * dpad, + GstDecodeChain * chain); +static void gst_decode_pad_unblock (GstDecodePad * dpad); +static void gst_decode_pad_set_blocked (GstDecodePad * dpad, gboolean blocked); + +static void gst_pending_pad_free (GstPendingPad * ppad); +static gboolean pad_event_cb (GstPad * pad, GstEvent * event, gpointer data); + +/******************************** + * Standard GObject boilerplate * + ********************************/ + +static void gst_decode_bin_class_init (GstDecodeBinClass * klass); +static void gst_decode_bin_init (GstDecodeBin * decode_bin); +static void gst_decode_bin_dispose (GObject * object); +static void gst_decode_bin_finalize (GObject * object); + +static GType +gst_decode_bin_get_type (void) +{ + static GType gst_decode_bin_type = 0; + + if (!gst_decode_bin_type) { + static const GTypeInfo gst_decode_bin_info = { + sizeof (GstDecodeBinClass), + NULL, + NULL, + (GClassInitFunc) gst_decode_bin_class_init, + NULL, + NULL, + sizeof (GstDecodeBin), + 0, + (GInstanceInitFunc) gst_decode_bin_init, + NULL + }; + + gst_decode_bin_type = + g_type_register_static (GST_TYPE_BIN, "GstDecodeBin2", + &gst_decode_bin_info, 0); + } + + return gst_decode_bin_type; +} + +static gboolean +_gst_boolean_accumulator (GSignalInvocationHint * ihint, + GValue * return_accu, const GValue * handler_return, gpointer dummy) +{ + gboolean myboolean; + + myboolean = g_value_get_boolean (handler_return); + if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP)) + g_value_set_boolean (return_accu, myboolean); + + /* stop emission if FALSE */ + return myboolean; +} + +/* we collect the first result */ +static gboolean +_gst_array_accumulator (GSignalInvocationHint * ihint, + GValue * return_accu, const GValue * handler_return, gpointer dummy) +{ + gpointer array; + + array = g_value_get_boxed (handler_return); + if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP)) + g_value_set_boxed (return_accu, array); + + return FALSE; +} + +static gboolean +_gst_select_accumulator (GSignalInvocationHint * ihint, + GValue * return_accu, const GValue * handler_return, gpointer dummy) +{ + GstAutoplugSelectResult res; + + res = g_value_get_enum (handler_return); + if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP)) + g_value_set_enum (return_accu, res); + + return FALSE; +} + +static gboolean +_gst_array_hasvalue_accumulator (GSignalInvocationHint * ihint, + GValue * return_accu, const GValue * handler_return, gpointer dummy) +{ + gpointer array; + + array = g_value_get_boxed (handler_return); + if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP)) + g_value_set_boxed (return_accu, array); + + if (array != NULL) + return FALSE; + + return TRUE; +} + +static void +gst_decode_bin_class_init (GstDecodeBinClass * klass) +{ + GObjectClass *gobject_klass; + GstElementClass *gstelement_klass; + + gobject_klass = (GObjectClass *) klass; + gstelement_klass = (GstElementClass *) klass; + + parent_class = g_type_class_peek_parent (klass); + + gobject_klass->dispose = gst_decode_bin_dispose; + gobject_klass->finalize = gst_decode_bin_finalize; + gobject_klass->set_property = gst_decode_bin_set_property; + gobject_klass->get_property = gst_decode_bin_get_property; + + /** + * GstDecodeBin2::new-decoded-pad: + * @bin: The decodebin. + * @pad: The newly created pad. + * @islast: #TRUE if this is the last pad to be added. Deprecated. + * + * This signal gets emitted as soon as a new pad of the same type as one of + * the valid 'raw' types is added. + * + * Deprecated: Use GstElement::pad-added instead of this signal. + * + */ + gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD] = + g_signal_new ("new-decoded-pad", G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (GstDecodeBinClass, new_decoded_pad), NULL, NULL, + gst_play_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 2, GST_TYPE_PAD, + G_TYPE_BOOLEAN); + + /** + * GstDecodeBin2::removed-decoded-pad: + * @bin: The decodebin. + * @pad: The pad that was removed. + * + * This signal is emitted when a 'final' caps pad has been removed. + * + * Deprecated: Use GstElement::pad-removed instead of this signal. + * + */ + gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD] = + g_signal_new ("removed-decoded-pad", G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (GstDecodeBinClass, removed_decoded_pad), NULL, NULL, + gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD); + + /** + * GstDecodeBin2::unknown-type: + * @bin: The decodebin. + * @pad: The new pad containing caps that cannot be resolved to a 'final' + * stream type. + * @caps: The #GstCaps of the pad that cannot be resolved. + * + * This signal is emitted when a pad for which there is no further possible + * decoding is added to the decodebin. + */ + gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE] = + g_signal_new ("unknown-type", G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, unknown_type), + NULL, NULL, gst_marshal_VOID__OBJECT_BOXED, G_TYPE_NONE, 2, + GST_TYPE_PAD, GST_TYPE_CAPS); + + /** + * GstDecodeBin2::autoplug-continue: + * @bin: The decodebin. + * @pad: The #GstPad. + * @caps: The #GstCaps found. + * + * This signal is emitted whenever decodebin2 finds a new stream. It is + * emitted before looking for any elements that can handle that stream. + * + * + * Invocation of signal handlers stops after the first signal handler + * returns #FALSE. Signal handlers are invoked in the order they were + * connected in. + * + * + * Returns: #TRUE if you wish decodebin2 to look for elements that can + * handle the given @caps. If #FALSE, those caps will be considered as + * final and the pad will be exposed as such (see 'new-decoded-pad' + * signal). + */ + gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE] = + g_signal_new ("autoplug-continue", G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_continue), + _gst_boolean_accumulator, NULL, gst_play_marshal_BOOLEAN__OBJECT_BOXED, + G_TYPE_BOOLEAN, 2, GST_TYPE_PAD, GST_TYPE_CAPS); + + /** + * GstDecodeBin2::autoplug-factories: + * @bin: The decodebin. + * @pad: The #GstPad. + * @caps: The #GstCaps found. + * + * This function is emited when an array of possible factories for @caps on + * @pad is needed. Decodebin2 will by default return an array with all + * compatible factories, sorted by rank. + * + * If this function returns NULL, @pad will be exposed as a final caps. + * + * If this function returns an empty array, the pad will be considered as + * having an unhandled type media type. + * + * + * Only the signal handler that is connected first will ever by invoked. + * Don't connect signal handlers with the #G_CONNECT_AFTER flag to this + * signal, they will never be invoked! + * + * + * Returns: a #GValueArray* with a list of factories to try. The factories are + * by default tried in the returned order or based on the index returned by + * "autoplug-select". + */ + gst_decode_bin_signals[SIGNAL_AUTOPLUG_FACTORIES] = + g_signal_new ("autoplug-factories", G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, + autoplug_factories), _gst_array_accumulator, NULL, + gst_play_marshal_BOXED__OBJECT_BOXED, G_TYPE_VALUE_ARRAY, 2, + GST_TYPE_PAD, GST_TYPE_CAPS); + + /** + * GstDecodeBin2::autoplug-sort: + * @bin: The decodebin. + * @pad: The #GstPad. + * @caps: The #GstCaps. + * @factories: A #GValueArray of possible #GstElementFactory to use. + * + * Once decodebin2 has found the possible #GstElementFactory objects to try + * for @caps on @pad, this signal is emited. The purpose of the signal is for + * the application to perform additional sorting or filtering on the element + * factory array. + * + * The callee should copy and modify @factories or return #NULL if the + * order should not change. + * + * + * Invocation of signal handlers stops after one signal handler has + * returned something else than #NULL. Signal handlers are invoked in + * the order they were connected in. + * Don't connect signal handlers with the #G_CONNECT_AFTER flag to this + * signal, they will never be invoked! + * + * + * Returns: A new sorted array of #GstElementFactory objects. + */ + gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT] = + g_signal_new ("autoplug-sort", G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_sort), + _gst_array_hasvalue_accumulator, NULL, + gst_play_marshal_BOXED__OBJECT_BOXED_BOXED, G_TYPE_VALUE_ARRAY, 3, + GST_TYPE_PAD, GST_TYPE_CAPS, G_TYPE_VALUE_ARRAY); + + /** + * GstDecodeBin2::autoplug-select: + * @bin: The decodebin. + * @pad: The #GstPad. + * @caps: The #GstCaps. + * @factory: A #GstElementFactory to use. + * + * This signal is emitted once decodebin2 has found all the possible + * #GstElementFactory that can be used to handle the given @caps. For each of + * those factories, this signal is emited. + * + * The signal handler should return a #GST_TYPE_AUTOPLUG_SELECT_RESULT enum + * value indicating what decodebin2 should do next. + * + * A value of #GST_AUTOPLUG_SELECT_TRY will try to autoplug an element from + * @factory. + * + * A value of #GST_AUTOPLUG_SELECT_EXPOSE will expose @pad without plugging + * any element to it. + * + * A value of #GST_AUTOPLUG_SELECT_SKIP will skip @factory and move to the + * next factory. + * + * + * Only the signal handler that is connected first will ever by invoked. + * Don't connect signal handlers with the #G_CONNECT_AFTER flag to this + * signal, they will never be invoked! + * + * + * Returns: a #GST_TYPE_AUTOPLUG_SELECT_RESULT that indicates the required + * operation. the default handler will always return + * #GST_AUTOPLUG_SELECT_TRY. + */ + gst_decode_bin_signals[SIGNAL_AUTOPLUG_SELECT] = + g_signal_new ("autoplug-select", G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_select), + _gst_select_accumulator, NULL, + gst_play_marshal_ENUM__OBJECT_BOXED_OBJECT, + GST_TYPE_AUTOPLUG_SELECT_RESULT, 3, GST_TYPE_PAD, GST_TYPE_CAPS, + GST_TYPE_ELEMENT_FACTORY); + + /** + * GstDecodeBin2::drained + * @bin: The decodebin + * + * This signal is emitted once decodebin2 has finished decoding all the data. + * + * Since: 0.10.16 + */ + gst_decode_bin_signals[SIGNAL_DRAINED] = + g_signal_new ("drained", G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, drained), + NULL, NULL, gst_marshal_VOID__VOID, G_TYPE_NONE, 0, G_TYPE_NONE); + + g_object_class_install_property (gobject_klass, PROP_CAPS, + g_param_spec_boxed ("caps", "Caps", "The caps on which to stop decoding.", + GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + g_object_class_install_property (gobject_klass, PROP_SUBTITLE_ENCODING, + g_param_spec_string ("subtitle-encoding", "subtitle encoding", + "Encoding to assume if input subtitles are not in UTF-8 encoding. " + "If not set, the GST_SUBTITLE_ENCODING environment variable will " + "be checked for an encoding to use. If that is not set either, " + "ISO-8859-15 will be assumed.", NULL, + G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + g_object_class_install_property (gobject_klass, PROP_SINK_CAPS, + g_param_spec_boxed ("sink-caps", "Sink Caps", + "The caps of the input data. (NULL = use typefind element)", + GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + /** + * GstDecodeBin2::use-buffering + * + * Activate buffering in decodebin2. This will instruct the multiqueues behind + * decoders to emit BUFFERING messages. + + * Since: 0.10.26 + */ + g_object_class_install_property (gobject_klass, PROP_USE_BUFFERING, + g_param_spec_boolean ("use-buffering", "Use Buffering", + "Emit GST_MESSAGE_BUFFERING based on low-/high-percent thresholds", + DEFAULT_USE_BUFFERING, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + /** + * GstDecodebin2:low-percent + * + * Low threshold percent for buffering to start. + * + * Since: 0.10.26 + */ + g_object_class_install_property (gobject_klass, PROP_LOW_PERCENT, + g_param_spec_int ("low-percent", "Low percent", + "Low threshold for buffering to start", 0, 100, + DEFAULT_LOW_PERCENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + /** + * GstDecodebin2:high-percent + * + * High threshold percent for buffering to finish. + * + * Since: 0.10.26 + */ + g_object_class_install_property (gobject_klass, PROP_HIGH_PERCENT, + g_param_spec_int ("high-percent", "High percent", + "High threshold for buffering to finish", 0, 100, + DEFAULT_HIGH_PERCENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + /** + * GstDecodebin2:max-size-bytes + * + * Max amount amount of bytes in the queue (0=automatic). + * + * Since: 0.10.26 + */ + g_object_class_install_property (gobject_klass, PROP_MAX_SIZE_BYTES, + g_param_spec_uint ("max-size-bytes", "Max. size (bytes)", + "Max. amount of bytes in the queue (0=automatic)", + 0, G_MAXUINT, DEFAULT_MAX_SIZE_BYTES, + G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + /** + * GstDecodebin2:max-size-buffers + * + * Max amount amount of buffers in the queue (0=automatic). + * + * Since: 0.10.26 + */ + g_object_class_install_property (gobject_klass, PROP_MAX_SIZE_BUFFERS, + g_param_spec_uint ("max-size-buffers", "Max. size (buffers)", + "Max. number of buffers in the queue (0=automatic)", + 0, G_MAXUINT, DEFAULT_MAX_SIZE_BUFFERS, + G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + /** + * GstDecodebin2:max-size-time + * + * Max amount amount of time in the queue (in ns, 0=automatic). + * + * Since: 0.10.26 + */ + g_object_class_install_property (gobject_klass, PROP_MAX_SIZE_TIME, + g_param_spec_uint64 ("max-size-time", "Max. size (ns)", + "Max. amount of data in the queue (in ns, 0=automatic)", + 0, G_MAXUINT64, + DEFAULT_MAX_SIZE_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + /** + * GstDecodeBin2::post-stream-topology + * + * Post stream-topology messages on the bus every time the topology changes. + * + * Since: 0.10.26 + */ + g_object_class_install_property (gobject_klass, PROP_POST_STREAM_TOPOLOGY, + g_param_spec_boolean ("post-stream-topology", "Post Stream Topology", + "Post stream-topology messages", + DEFAULT_POST_STREAM_TOPOLOGY, + G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + /** + * GstDecodeBin2::expose-all-streams + * + * Expose streams of unknown type. + * + * If set to %FALSE, then only the streams that can be decoded to the final + * caps (see 'caps' property) will have a pad exposed. Streams that do not + * match those caps but could have been decoded will not have decoder plugged + * in internally and will not have a pad exposed. + * + * Since: 0.10.30 + */ + g_object_class_install_property (gobject_klass, PROP_EXPOSE_ALL_STREAMS, + g_param_spec_boolean ("expose-all-streams", "Expose All Streams", + "Expose all streams, including those of unknown type or that don't match the 'caps' property", + DEFAULT_EXPOSE_ALL_STREAMS, + G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + + + klass->autoplug_continue = + GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_continue); + klass->autoplug_factories = + GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_factories); + klass->autoplug_sort = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_sort); + klass->autoplug_select = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_select); + + gst_element_class_add_pad_template (gstelement_klass, + gst_static_pad_template_get (&decoder_bin_sink_template)); + gst_element_class_add_pad_template (gstelement_klass, + gst_static_pad_template_get (&decoder_bin_src_template)); + + gst_element_class_set_details_simple (gstelement_klass, + "Decoder Bin", "Generic/Bin/Decoder", + "Autoplug and decode to raw media", + "Edward Hervey , " + "Sebastian Dröge "); + + gstelement_klass->change_state = + GST_DEBUG_FUNCPTR (gst_decode_bin_change_state); +} + +/* Must be called with factories lock! */ +static void +gst_decode_bin_update_factories_list (GstDecodeBin * dbin) +{ + if (!dbin->factories + || dbin->factories_cookie != + gst_default_registry_get_feature_list_cookie ()) { + if (dbin->factories) + gst_plugin_feature_list_free (dbin->factories); + dbin->factories = + gst_element_factory_list_get_elements + (GST_ELEMENT_FACTORY_TYPE_DECODABLE, GST_RANK_MARGINAL); + dbin->factories_cookie = gst_default_registry_get_feature_list_cookie (); + } +} + +static void +gst_decode_bin_init (GstDecodeBin * decode_bin) +{ + /* first filter out the interesting element factories */ + decode_bin->factories_lock = g_mutex_new (); + + /* we create the typefind element only once */ + decode_bin->typefind = gst_element_factory_make ("typefind", "typefind"); + if (!decode_bin->typefind) { + g_warning ("can't find typefind element, decodebin will not work"); + } else { + GstPad *pad; + GstPad *gpad; + GstPadTemplate *pad_tmpl; + + /* add the typefind element */ + if (!gst_bin_add (GST_BIN (decode_bin), decode_bin->typefind)) { + g_warning ("Could not add typefind element, decodebin will not work"); + gst_object_unref (decode_bin->typefind); + decode_bin->typefind = NULL; + } + + /* get the sinkpad */ + pad = gst_element_get_static_pad (decode_bin->typefind, "sink"); + + /* get the pad template */ + pad_tmpl = gst_static_pad_template_get (&decoder_bin_sink_template); + + /* ghost the sink pad to ourself */ + gpad = gst_ghost_pad_new_from_template ("sink", pad, pad_tmpl); + gst_pad_set_active (gpad, TRUE); + gst_element_add_pad (GST_ELEMENT (decode_bin), gpad); + + gst_object_unref (pad_tmpl); + gst_object_unref (pad); + + /* connect a signal to find out when the typefind element found + * a type */ + decode_bin->have_type_id = + g_signal_connect (G_OBJECT (decode_bin->typefind), "have-type", + G_CALLBACK (type_found), decode_bin); + } + + decode_bin->expose_lock = g_mutex_new (); + decode_bin->decode_chain = NULL; + + decode_bin->dyn_lock = g_mutex_new (); + decode_bin->shutdown = FALSE; + decode_bin->blocked_pads = NULL; + + decode_bin->subtitle_lock = g_mutex_new (); + + decode_bin->encoding = g_strdup (DEFAULT_SUBTITLE_ENCODING); + decode_bin->caps = gst_static_caps_get (&default_raw_caps); + decode_bin->use_buffering = DEFAULT_USE_BUFFERING; + decode_bin->low_percent = DEFAULT_LOW_PERCENT; + decode_bin->high_percent = DEFAULT_HIGH_PERCENT; + + decode_bin->max_size_bytes = DEFAULT_MAX_SIZE_BYTES; + decode_bin->max_size_buffers = DEFAULT_MAX_SIZE_BUFFERS; + decode_bin->max_size_time = DEFAULT_MAX_SIZE_TIME; + + decode_bin->expose_allstreams = DEFAULT_EXPOSE_ALL_STREAMS; +} + +static void +gst_decode_bin_dispose (GObject * object) +{ + GstDecodeBin *decode_bin; + + decode_bin = GST_DECODE_BIN (object); + + if (decode_bin->factories) + gst_plugin_feature_list_free (decode_bin->factories); + decode_bin->factories = NULL; + + if (decode_bin->decode_chain) + gst_decode_chain_free (decode_bin->decode_chain); + decode_bin->decode_chain = NULL; + + if (decode_bin->caps) + gst_caps_unref (decode_bin->caps); + decode_bin->caps = NULL; + + g_free (decode_bin->encoding); + decode_bin->encoding = NULL; + + g_list_free (decode_bin->subtitles); + decode_bin->subtitles = NULL; + + G_OBJECT_CLASS (parent_class)->dispose (object); +} + +static void +gst_decode_bin_finalize (GObject * object) +{ + GstDecodeBin *decode_bin; + + decode_bin = GST_DECODE_BIN (object); + + if (decode_bin->expose_lock) { + g_mutex_free (decode_bin->expose_lock); + decode_bin->expose_lock = NULL; + } + + if (decode_bin->dyn_lock) { + g_mutex_free (decode_bin->dyn_lock); + decode_bin->dyn_lock = NULL; + } + + if (decode_bin->subtitle_lock) { + g_mutex_free (decode_bin->subtitle_lock); + decode_bin->subtitle_lock = NULL; + } + + if (decode_bin->factories_lock) { + g_mutex_free (decode_bin->factories_lock); + decode_bin->factories_lock = NULL; + } + + G_OBJECT_CLASS (parent_class)->finalize (object); +} + +/* _set_caps + * Changes the caps on which decodebin will stop decoding. + * Will unref the previously set one. The refcount of the given caps will be + * increased. + * @caps can be NULL. + * + * MT-safe + */ +static void +gst_decode_bin_set_caps (GstDecodeBin * dbin, GstCaps * caps) +{ + GST_DEBUG_OBJECT (dbin, "Setting new caps: %" GST_PTR_FORMAT, caps); + + GST_OBJECT_LOCK (dbin); + gst_caps_replace (&dbin->caps, caps); + GST_OBJECT_UNLOCK (dbin); +} + +/* _get_caps + * Returns the currently configured caps on which decodebin will stop decoding. + * The returned caps (if not NULL), will have its refcount incremented. + * + * MT-safe + */ +static GstCaps * +gst_decode_bin_get_caps (GstDecodeBin * dbin) +{ + GstCaps *caps; + + GST_DEBUG_OBJECT (dbin, "Getting currently set caps"); + + GST_OBJECT_LOCK (dbin); + caps = dbin->caps; + if (caps) + gst_caps_ref (caps); + GST_OBJECT_UNLOCK (dbin); + + return caps; +} + +static void +gst_decode_bin_set_sink_caps (GstDecodeBin * dbin, GstCaps * caps) +{ + GST_DEBUG_OBJECT (dbin, "Setting new caps: %" GST_PTR_FORMAT, caps); + + g_object_set (dbin->typefind, "force-caps", caps, NULL); +} + +static GstCaps * +gst_decode_bin_get_sink_caps (GstDecodeBin * dbin) +{ + GstCaps *caps; + + GST_DEBUG_OBJECT (dbin, "Getting currently set caps"); + + g_object_get (dbin->typefind, "force-caps", &caps, NULL); + + return caps; +} + +static void +gst_decode_bin_set_subs_encoding (GstDecodeBin * dbin, const gchar * encoding) +{ + GList *walk; + + GST_DEBUG_OBJECT (dbin, "Setting new encoding: %s", GST_STR_NULL (encoding)); + + SUBTITLE_LOCK (dbin); + g_free (dbin->encoding); + dbin->encoding = g_strdup (encoding); + + /* set the subtitle encoding on all added elements */ + for (walk = dbin->subtitles; walk; walk = g_list_next (walk)) { + g_object_set (G_OBJECT (walk->data), "subtitle-encoding", dbin->encoding, + NULL); + } + SUBTITLE_UNLOCK (dbin); +} + +static gchar * +gst_decode_bin_get_subs_encoding (GstDecodeBin * dbin) +{ + gchar *encoding; + + GST_DEBUG_OBJECT (dbin, "Getting currently set encoding"); + + SUBTITLE_LOCK (dbin); + encoding = g_strdup (dbin->encoding); + SUBTITLE_UNLOCK (dbin); + + return encoding; +} + +static void +gst_decode_bin_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec) +{ + GstDecodeBin *dbin; + + dbin = GST_DECODE_BIN (object); + + switch (prop_id) { + case PROP_CAPS: + gst_decode_bin_set_caps (dbin, g_value_get_boxed (value)); + break; + case PROP_SUBTITLE_ENCODING: + gst_decode_bin_set_subs_encoding (dbin, g_value_get_string (value)); + break; + case PROP_SINK_CAPS: + gst_decode_bin_set_sink_caps (dbin, g_value_get_boxed (value)); + break; + case PROP_USE_BUFFERING: + dbin->use_buffering = g_value_get_boolean (value); + break; + case PROP_LOW_PERCENT: + dbin->low_percent = g_value_get_int (value); + break; + case PROP_HIGH_PERCENT: + dbin->high_percent = g_value_get_int (value); + break; + case PROP_MAX_SIZE_BYTES: + dbin->max_size_bytes = g_value_get_uint (value); + break; + case PROP_MAX_SIZE_BUFFERS: + dbin->max_size_buffers = g_value_get_uint (value); + break; + case PROP_MAX_SIZE_TIME: + dbin->max_size_time = g_value_get_uint64 (value); + break; + case PROP_POST_STREAM_TOPOLOGY: + dbin->post_stream_topology = g_value_get_boolean (value); + break; + case PROP_EXPOSE_ALL_STREAMS: + dbin->expose_allstreams = g_value_get_boolean (value); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +gst_decode_bin_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec) +{ + GstDecodeBin *dbin; + + dbin = GST_DECODE_BIN (object); + switch (prop_id) { + case PROP_CAPS: + g_value_take_boxed (value, gst_decode_bin_get_caps (dbin)); + break; + case PROP_SUBTITLE_ENCODING: + g_value_take_string (value, gst_decode_bin_get_subs_encoding (dbin)); + break; + case PROP_SINK_CAPS: + g_value_take_boxed (value, gst_decode_bin_get_sink_caps (dbin)); + break; + case PROP_USE_BUFFERING: + g_value_set_boolean (value, dbin->use_buffering); + break; + case PROP_LOW_PERCENT: + g_value_set_int (value, dbin->low_percent); + break; + case PROP_HIGH_PERCENT: + g_value_set_int (value, dbin->high_percent); + break; + case PROP_MAX_SIZE_BYTES: + g_value_set_uint (value, dbin->max_size_bytes); + break; + case PROP_MAX_SIZE_BUFFERS: + g_value_set_uint (value, dbin->max_size_buffers); + break; + case PROP_MAX_SIZE_TIME: + g_value_set_uint64 (value, dbin->max_size_time); + break; + case PROP_POST_STREAM_TOPOLOGY: + g_value_set_boolean (value, dbin->post_stream_topology); + break; + case PROP_EXPOSE_ALL_STREAMS: + g_value_set_boolean (value, dbin->expose_allstreams); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + + +/***** + * Default autoplug signal handlers + *****/ +static gboolean +gst_decode_bin_autoplug_continue (GstElement * element, GstPad * pad, + GstCaps * caps) +{ + GST_DEBUG_OBJECT (element, "autoplug-continue returns TRUE"); + + /* by default we always continue */ + return TRUE; +} + +static GValueArray * +gst_decode_bin_autoplug_factories (GstElement * element, GstPad * pad, + GstCaps * caps) +{ + GList *list, *tmp; + GValueArray *result; + GstDecodeBin *dbin = GST_DECODE_BIN_CAST (element); + + GST_DEBUG_OBJECT (element, "finding factories"); + + /* return all compatible factories for caps */ + g_mutex_lock (dbin->factories_lock); + gst_decode_bin_update_factories_list (dbin); + list = + gst_element_factory_list_filter (dbin->factories, caps, GST_PAD_SINK, + FALSE); + g_mutex_unlock (dbin->factories_lock); + + result = g_value_array_new (g_list_length (list)); + for (tmp = list; tmp; tmp = tmp->next) { + GstElementFactory *factory = GST_ELEMENT_FACTORY_CAST (tmp->data); + GValue val = { 0, }; + + g_value_init (&val, G_TYPE_OBJECT); + g_value_set_object (&val, factory); + g_value_array_append (result, &val); + g_value_unset (&val); + } + gst_plugin_feature_list_free (list); + + GST_DEBUG_OBJECT (element, "autoplug-factories returns %p", result); + + return result; +} + +static GValueArray * +gst_decode_bin_autoplug_sort (GstElement * element, GstPad * pad, + GstCaps * caps, GValueArray * factories) +{ + return NULL; +} + +static GstAutoplugSelectResult +gst_decode_bin_autoplug_select (GstElement * element, GstPad * pad, + GstCaps * caps, GstElementFactory * factory) +{ + GST_DEBUG_OBJECT (element, "default autoplug-select returns TRY"); + + /* Try factory. */ + return GST_AUTOPLUG_SELECT_TRY; +} + +/******** + * Discovery methods + *****/ + +static gboolean are_final_caps (GstDecodeBin * dbin, GstCaps * caps); +static gboolean is_demuxer_element (GstElement * srcelement); + +static gboolean connect_pad (GstDecodeBin * dbin, GstElement * src, + GstDecodePad * dpad, GstPad * pad, GstCaps * caps, GValueArray * factories, + GstDecodeChain * chain); +static gboolean connect_element (GstDecodeBin * dbin, GstElement * element, + GstDecodeChain * chain); +static void expose_pad (GstDecodeBin * dbin, GstElement * src, + GstDecodePad * dpad, GstPad * pad, GstCaps * caps, GstDecodeChain * chain); + +static void pad_added_cb (GstElement * element, GstPad * pad, + GstDecodeChain * chain); +static void pad_removed_cb (GstElement * element, GstPad * pad, + GstDecodeChain * chain); +static void no_more_pads_cb (GstElement * element, GstDecodeChain * chain); + +static GstDecodeGroup *gst_decode_chain_get_current_group (GstDecodeChain * + chain); + +/* called when a new pad is discovered. It will perform some basic actions + * before trying to link something to it. + * + * - Check the caps, don't do anything when there are no caps or when they have + * no good type. + * - signal AUTOPLUG_CONTINUE to check if we need to continue autoplugging this + * pad. + * - if the caps are non-fixed, setup a handler to continue autoplugging when + * the caps become fixed (connect to notify::caps). + * - get list of factories to autoplug. + * - continue autoplugging to one of the factories. + */ +static void +analyze_new_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad, + GstCaps * caps, GstDecodeChain * chain) +{ + gboolean apcontinue = TRUE; + GValueArray *factories = NULL, *result = NULL; + GstDecodePad *dpad; + + GST_DEBUG_OBJECT (dbin, "Pad %s:%s caps:%" GST_PTR_FORMAT, + GST_DEBUG_PAD_NAME (pad), caps); + + if (chain->elements && src != chain->elements->data) { + GST_ERROR_OBJECT (dbin, "New pad from not the last element in this chain"); + return; + } + + if (chain->endpad) { + GST_ERROR_OBJECT (dbin, "New pad in a chain that is already complete"); + return; + } + + if (chain->demuxer) { + GstDecodeGroup *group; + GstDecodeChain *oldchain = chain; + + /* we are adding a new pad for a demuxer (see is_demuxer_element(), + * start a new chain for it */ + CHAIN_MUTEX_LOCK (oldchain); + group = gst_decode_chain_get_current_group (chain); + if (group) { + chain = gst_decode_chain_new (dbin, group, pad); + group->children = g_list_prepend (group->children, chain); + } + CHAIN_MUTEX_UNLOCK (oldchain); + if (!group) { + GST_WARNING_OBJECT (dbin, "No current group"); + return; + } + } + + if ((caps == NULL) || gst_caps_is_empty (caps)) + goto unknown_type; + + if (gst_caps_is_any (caps)) + goto any_caps; + + dpad = gst_decode_pad_new (dbin, pad, chain); + + /* 1. Emit 'autoplug-continue' the result will tell us if this pads needs + * further autoplugging. */ + g_signal_emit (G_OBJECT (dbin), + gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE], 0, dpad, caps, + &apcontinue); + + /* 1.a if autoplug-continue is FALSE or caps is a raw format, goto pad_is_final */ + if ((!apcontinue) || are_final_caps (dbin, caps)) + goto expose_pad; + + /* 1.b when the caps are not fixed yet, we can't be sure what element to + * connect. We delay autoplugging until the caps are fixed */ + if (!gst_caps_is_fixed (caps)) + goto non_fixed; + + /* 1.c else get the factories and if there's no compatible factory goto + * unknown_type */ + g_signal_emit (G_OBJECT (dbin), + gst_decode_bin_signals[SIGNAL_AUTOPLUG_FACTORIES], 0, dpad, caps, + &factories); + + /* NULL means that we can expose the pad */ + if (factories == NULL) + goto expose_pad; + + /* if the array is empty, we have a type for which we have no decoder */ + if (factories->n_values == 0) { + if (!dbin->expose_allstreams) { + GstCaps *raw = gst_static_caps_get (&default_raw_caps); + + /* If the caps are raw, this just means we don't want to expose them */ + if (gst_caps_can_intersect (raw, caps)) { + gst_caps_unref (raw); + gst_object_unref (dpad); + goto discarded_type; + } + gst_caps_unref (raw); + } + + /* if not we have a unhandled type with no compatible factories */ + g_value_array_free (factories); + gst_object_unref (dpad); + goto unknown_type; + } + + /* 1.d sort some more. */ + g_signal_emit (G_OBJECT (dbin), + gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT], 0, dpad, caps, factories, + &result); + if (result) { + g_value_array_free (factories); + factories = result; + } + + /* At this point we have a potential decoder, but we might not need it + * if it doesn't match the output caps */ + if (!dbin->expose_allstreams) { + guint i; + const GList *tmps; + gboolean dontuse = FALSE; + + GST_DEBUG ("Checking if we can abort early"); + + /* 1.e Do an early check to see if the candidates are potential decoders, but + * due to the fact that they decode to a mediatype that is not final we don't + * need them */ + + for (i = 0; i < factories->n_values && !dontuse; i++) { + GstElementFactory *factory = + g_value_get_object (g_value_array_get_nth (factories, 0)); + GstCaps *tcaps; + + /* We are only interested in skipping decoders */ + if (strstr (gst_element_factory_get_klass (factory), "Decoder")) { + + GST_DEBUG ("Trying factory %s", + gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory))); + + /* Check the source pad template caps to see if they match raw caps but don't match + * our final caps*/ + for (tmps = gst_element_factory_get_static_pad_templates (factory); + tmps && !dontuse; tmps = tmps->next) { + GstStaticPadTemplate *st = (GstStaticPadTemplate *) tmps->data; + if (st->direction != GST_PAD_SRC) + continue; + tcaps = gst_static_pad_template_get_caps (st); + + apcontinue = TRUE; + + /* Emit autoplug-continue to see if the caps are considered to be raw caps */ + g_signal_emit (G_OBJECT (dbin), + gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE], 0, dpad, tcaps, + &apcontinue); + + /* If autoplug-continue returns TRUE and the caps are not final, don't use them */ + if (apcontinue && !are_final_caps (dbin, tcaps)) + dontuse = TRUE; + gst_caps_unref (tcaps); + } + } + } + + if (dontuse) { + gst_object_unref (dpad); + goto discarded_type; + } + } + + /* 1.f else continue autoplugging something from the list. */ + GST_LOG_OBJECT (pad, "Let's continue discovery on this pad"); + connect_pad (dbin, src, dpad, pad, caps, factories, chain); + + gst_object_unref (dpad); + g_value_array_free (factories); + + return; + +expose_pad: + { + GST_LOG_OBJECT (dbin, "Pad is final. autoplug-continue:%d", apcontinue); + expose_pad (dbin, src, dpad, pad, caps, chain); + gst_object_unref (dpad); + return; + } + +discarded_type: + { + GST_LOG_OBJECT (pad, "Known type, but discarded because not final caps"); + chain->deadend = TRUE; + chain->endcaps = gst_caps_ref (caps); + + /* Try to expose anything */ + EXPOSE_LOCK (dbin); + if (gst_decode_chain_is_complete (dbin->decode_chain)) { + gst_decode_bin_expose (dbin); + } + EXPOSE_UNLOCK (dbin); + do_async_done (dbin); + + return; + } + +unknown_type: + { + GST_LOG_OBJECT (pad, "Unknown type, posting message and firing signal"); + + chain->deadend = TRUE; + chain->endcaps = gst_caps_ref (caps); + + gst_element_post_message (GST_ELEMENT_CAST (dbin), + gst_missing_decoder_message_new (GST_ELEMENT_CAST (dbin), caps)); + + g_signal_emit (G_OBJECT (dbin), + gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE], 0, pad, caps); + + /* Try to expose anything */ + EXPOSE_LOCK (dbin); + if (gst_decode_chain_is_complete (dbin->decode_chain)) { + gst_decode_bin_expose (dbin); + } + EXPOSE_UNLOCK (dbin); + + if (src == dbin->typefind) { + gchar *desc; + + if (caps && !gst_caps_is_empty (caps)) { + desc = gst_pb_utils_get_decoder_description (caps); + GST_ELEMENT_ERROR (dbin, STREAM, CODEC_NOT_FOUND, + (_("A %s plugin is required to play this stream, " + "but not installed."), desc), + ("No decoder to handle media type '%s'", + gst_structure_get_name (gst_caps_get_structure (caps, 0)))); + g_free (desc); + } else { + GST_ELEMENT_ERROR (dbin, STREAM, TYPE_NOT_FOUND, + (_("Could not determine type of stream")), + ("Stream caps %" GST_PTR_FORMAT, caps)); + } + do_async_done (dbin); + } + return; + } +non_fixed: + { + GST_DEBUG_OBJECT (pad, "pad has non-fixed caps delay autoplugging"); + gst_object_unref (dpad); + goto setup_caps_delay; + } +any_caps: + { + GST_WARNING_OBJECT (pad, + "pad has ANY caps, not able to autoplug to anything"); + goto setup_caps_delay; + } +setup_caps_delay: + { + GstPendingPad *ppad; + + /* connect to caps notification */ + CHAIN_MUTEX_LOCK (chain); + GST_LOG_OBJECT (dbin, "Chain %p has now %d dynamic pads", chain, + g_list_length (chain->pending_pads)); + ppad = g_slice_new0 (GstPendingPad); + ppad->pad = gst_object_ref (pad); + ppad->chain = chain; + ppad->event_probe_id = + gst_pad_add_event_probe (pad, (GCallback) pad_event_cb, ppad); + chain->pending_pads = g_list_prepend (chain->pending_pads, ppad); + CHAIN_MUTEX_UNLOCK (chain); + g_signal_connect (G_OBJECT (pad), "notify::caps", + G_CALLBACK (caps_notify_cb), chain); + return; + } +} + + +/* connect_pad: + * + * Try to connect the given pad to an element created from one of the factories, + * and recursively. + * + * Note that dpad is ghosting pad, and so pad is linked; be sure to unset dpad's + * target before trying to link pad. + * + * Returns TRUE if an element was properly created and linked + */ +static gboolean +connect_pad (GstDecodeBin * dbin, GstElement * src, GstDecodePad * dpad, + GstPad * pad, GstCaps * caps, GValueArray * factories, + GstDecodeChain * chain) +{ + gboolean res = FALSE; + GstPad *mqpad = NULL; + gboolean is_demuxer = chain->parent && !chain->elements; /* First pad after the demuxer */ + + g_return_val_if_fail (factories != NULL, FALSE); + g_return_val_if_fail (factories->n_values > 0, FALSE); + + GST_DEBUG_OBJECT (dbin, "pad %s:%s , chain:%p", + GST_DEBUG_PAD_NAME (pad), chain); + + /* 1. is element demuxer or parser */ + if (is_demuxer) { + GST_LOG_OBJECT (src, + "is a demuxer, connecting the pad through multiqueue '%s'", + GST_OBJECT_NAME (chain->parent->multiqueue)); + + gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), NULL); + if (!(mqpad = gst_decode_group_control_demuxer_pad (chain->parent, pad))) + goto beach; + src = chain->parent->multiqueue; + pad = mqpad; + gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), pad); + } + + /* 2. Try to create an element and link to it */ + while (factories->n_values > 0) { + GstAutoplugSelectResult ret; + GstElementFactory *factory; + GstElement *element; + GstPad *sinkpad; + gboolean subtitle; + + /* Set dpad target to pad again, it might've been unset + * below but we came back here because something failed + */ + gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), pad); + + /* take first factory */ + factory = g_value_get_object (g_value_array_get_nth (factories, 0)); + /* Remove selected factory from the list. */ + g_value_array_remove (factories, 0); + + /* If the factory is for a parser we first check if the factory + * was already used for the current chain. If it was used already + * we would otherwise create an infinite loop here because the + * parser apparently accepts its own output as input. + * This is only done for parsers because it's perfectly valid + * to have other element classes after each other because a + * parser is the only one that does not change the data. A + * valid example for this would be multiple id3demux in a row. + */ + if (strstr (gst_element_factory_get_klass (factory), "Parser")) { + gboolean skip = FALSE; + GList *l; + + CHAIN_MUTEX_LOCK (chain); + for (l = chain->elements; l; l = l->next) { + GstElement *otherelement = GST_ELEMENT_CAST (l->data); + + if (gst_element_get_factory (otherelement) == factory) { + skip = TRUE; + break; + } + } + CHAIN_MUTEX_UNLOCK (chain); + if (skip) { + GST_DEBUG_OBJECT (dbin, + "Skipping factory '%s' because it was already used in this chain", + gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST (factory))); + continue; + } + } + + /* emit autoplug-select to see what we should do with it. */ + g_signal_emit (G_OBJECT (dbin), + gst_decode_bin_signals[SIGNAL_AUTOPLUG_SELECT], + 0, dpad, caps, factory, &ret); + + switch (ret) { + case GST_AUTOPLUG_SELECT_TRY: + GST_DEBUG_OBJECT (dbin, "autoplug select requested try"); + break; + case GST_AUTOPLUG_SELECT_EXPOSE: + GST_DEBUG_OBJECT (dbin, "autoplug select requested expose"); + /* expose the pad, we don't have the source element */ + expose_pad (dbin, src, dpad, pad, caps, chain); + res = TRUE; + goto beach; + case GST_AUTOPLUG_SELECT_SKIP: + GST_DEBUG_OBJECT (dbin, "autoplug select requested skip"); + continue; + default: + GST_WARNING_OBJECT (dbin, "autoplug select returned unhandled %d", ret); + break; + } + + /* 2.0. Unlink pad */ + gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), NULL); + + /* 2.1. Try to create an element */ + if ((element = gst_element_factory_create (factory, NULL)) == NULL) { + GST_WARNING_OBJECT (dbin, "Could not create an element from %s", + gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory))); + continue; + } + + /* ... activate it ... We do this before adding it to the bin so that we + * don't accidentally make it post error messages that will stop + * everything. */ + if ((gst_element_set_state (element, + GST_STATE_READY)) == GST_STATE_CHANGE_FAILURE) { + GST_WARNING_OBJECT (dbin, "Couldn't set %s to READY", + GST_ELEMENT_NAME (element)); + gst_object_unref (element); + continue; + } + + /* 2.3. Find its sink pad, this should work after activating it. */ + if (!(sinkpad = find_sink_pad (element))) { + GST_WARNING_OBJECT (dbin, "Element %s doesn't have a sink pad", + GST_ELEMENT_NAME (element)); + gst_element_set_state (element, GST_STATE_NULL); + gst_object_unref (element); + continue; + } + + /* 2.4 add it ... */ + if (!(gst_bin_add (GST_BIN_CAST (dbin), element))) { + GST_WARNING_OBJECT (dbin, "Couldn't add %s to the bin", + GST_ELEMENT_NAME (element)); + gst_object_unref (sinkpad); + gst_element_set_state (element, GST_STATE_NULL); + gst_object_unref (element); + continue; + } + + /* 2.5 ...and try to link */ + if ((gst_pad_link (pad, sinkpad)) != GST_PAD_LINK_OK) { + GST_WARNING_OBJECT (dbin, "Link failed on pad %s:%s", + GST_DEBUG_PAD_NAME (sinkpad)); + gst_element_set_state (element, GST_STATE_NULL); + gst_object_unref (sinkpad); + gst_bin_remove (GST_BIN (dbin), element); + continue; + } + gst_object_unref (sinkpad); + GST_LOG_OBJECT (dbin, "linked on pad %s:%s", GST_DEBUG_PAD_NAME (pad)); + + CHAIN_MUTEX_LOCK (chain); + chain->elements = + g_list_prepend (chain->elements, gst_object_ref (element)); + chain->demuxer = is_demuxer_element (element); + CHAIN_MUTEX_UNLOCK (chain); + + /* link this element further */ + connect_element (dbin, element, chain); + + /* try to configure the subtitle encoding property when we can */ + if (g_object_class_find_property (G_OBJECT_GET_CLASS (element), + "subtitle-encoding")) { + SUBTITLE_LOCK (dbin); + GST_DEBUG_OBJECT (dbin, + "setting subtitle-encoding=%s to element", dbin->encoding); + g_object_set (G_OBJECT (element), "subtitle-encoding", dbin->encoding, + NULL); + SUBTITLE_UNLOCK (dbin); + subtitle = TRUE; + } else + subtitle = FALSE; + + /* Bring the element to the state of the parent */ + if ((gst_element_set_state (element, + GST_STATE_PAUSED)) == GST_STATE_CHANGE_FAILURE) { + GstElement *tmp = NULL; + + GST_WARNING_OBJECT (dbin, "Couldn't set %s to PAUSED", + GST_ELEMENT_NAME (element)); + + /* Remove all elements in this chain that were just added. No + * other thread could've added elements in the meantime */ + CHAIN_MUTEX_LOCK (chain); + do { + GList *l; + + tmp = chain->elements->data; + + /* Disconnect any signal handlers that might be connected + * in connect_element() or analyze_pad() */ + g_signal_handlers_disconnect_by_func (tmp, pad_added_cb, chain); + g_signal_handlers_disconnect_by_func (tmp, pad_removed_cb, chain); + g_signal_handlers_disconnect_by_func (tmp, no_more_pads_cb, chain); + + for (l = chain->pending_pads; l;) { + GstPendingPad *pp = l->data; + GList *n; + + if (GST_PAD_PARENT (pp->pad) != tmp) { + l = l->next; + continue; + } + + g_signal_handlers_disconnect_by_func (pp->pad, caps_notify_cb, chain); + gst_pad_remove_event_probe (pp->pad, pp->event_probe_id); + gst_object_unref (pp->pad); + g_slice_free (GstPendingPad, pp); + + /* Remove element from the list, update list head and go to the + * next element in the list */ + n = l->next; + chain->pending_pads = g_list_delete_link (chain->pending_pads, l); + l = n; + } + + gst_bin_remove (GST_BIN (dbin), tmp); + gst_element_set_state (tmp, GST_STATE_NULL); + + gst_object_unref (tmp); + chain->elements = g_list_delete_link (chain->elements, chain->elements); + } while (tmp != element); + CHAIN_MUTEX_UNLOCK (chain); + + continue; + } + if (subtitle) { + SUBTITLE_LOCK (dbin); + /* we added the element now, add it to the list of subtitle-encoding + * elements when we can set the property */ + dbin->subtitles = g_list_prepend (dbin->subtitles, element); + SUBTITLE_UNLOCK (dbin); + } + + res = TRUE; + break; + } + +beach: + if (mqpad) + gst_object_unref (mqpad); + + return res; +} + +static GstCaps * +get_pad_caps (GstPad * pad) +{ + GstCaps *caps; + + /* first check the pad caps, if this is set, we are positively sure it is + * fixed and exactly what the element will produce. */ + GST_OBJECT_LOCK (pad); + if ((caps = GST_PAD_CAPS (pad))) + gst_caps_ref (caps); + GST_OBJECT_UNLOCK (pad); + + /* then use the getcaps function if we don't have caps. These caps might not + * be fixed in some cases, in which case analyze_new_pad will set up a + * notify::caps signal to continue autoplugging. */ + if (caps == NULL) + caps = gst_pad_get_caps_reffed (pad); + + return caps; +} + +static gboolean +connect_element (GstDecodeBin * dbin, GstElement * element, + GstDecodeChain * chain) +{ + GList *pads; + gboolean res = TRUE; + gboolean dynamic = FALSE; + GList *to_connect = NULL; + + GST_DEBUG_OBJECT (dbin, "Attempting to connect element %s [chain:%p] further", + GST_ELEMENT_NAME (element), chain); + + /* 1. Loop over pad templates, grabbing existing pads along the way */ + for (pads = GST_ELEMENT_GET_CLASS (element)->padtemplates; pads; + pads = g_list_next (pads)) { + GstPadTemplate *templ = GST_PAD_TEMPLATE (pads->data); + const gchar *templ_name; + + /* we are only interested in source pads */ + if (GST_PAD_TEMPLATE_DIRECTION (templ) != GST_PAD_SRC) + continue; + + templ_name = GST_PAD_TEMPLATE_NAME_TEMPLATE (templ); + GST_DEBUG_OBJECT (dbin, "got a source pad template %s", templ_name); + + /* figure out what kind of pad this is */ + switch (GST_PAD_TEMPLATE_PRESENCE (templ)) { + case GST_PAD_ALWAYS: + { + /* get the pad that we need to autoplug */ + GstPad *pad = gst_element_get_static_pad (element, templ_name); + + if (pad) { + GST_DEBUG_OBJECT (dbin, "got the pad for always template %s", + templ_name); + /* here is the pad, we need to autoplug it */ + to_connect = g_list_prepend (to_connect, pad); + } else { + /* strange, pad is marked as always but it's not + * there. Fix the element */ + GST_WARNING_OBJECT (dbin, + "could not get the pad for always template %s", templ_name); + } + break; + } + case GST_PAD_SOMETIMES: + { + /* try to get the pad to see if it is already created or + * not */ + GstPad *pad = gst_element_get_static_pad (element, templ_name); + + if (pad) { + GST_DEBUG_OBJECT (dbin, "got the pad for sometimes template %s", + templ_name); + /* the pad is created, we need to autoplug it */ + to_connect = g_list_prepend (to_connect, pad); + } else { + GST_DEBUG_OBJECT (dbin, + "did not get the sometimes pad of template %s", templ_name); + /* we have an element that will create dynamic pads */ + dynamic = TRUE; + } + break; + } + case GST_PAD_REQUEST: + /* ignore request pads */ + GST_DEBUG_OBJECT (dbin, "ignoring request padtemplate %s", templ_name); + break; + } + } + + /* 2. if there are more potential pads, connect to relevant signals */ + if (dynamic) { + GST_LOG_OBJECT (dbin, "Adding signals to element %s in chain %p", + GST_ELEMENT_NAME (element), chain); + g_signal_connect (G_OBJECT (element), "pad-added", + G_CALLBACK (pad_added_cb), chain); + g_signal_connect (G_OBJECT (element), "pad-removed", + G_CALLBACK (pad_removed_cb), chain); + g_signal_connect (G_OBJECT (element), "no-more-pads", + G_CALLBACK (no_more_pads_cb), chain); + } + + /* 3. for every available pad, connect it */ + for (pads = to_connect; pads; pads = g_list_next (pads)) { + GstPad *pad = GST_PAD_CAST (pads->data); + GstCaps *caps; + + caps = get_pad_caps (pad); + analyze_new_pad (dbin, element, pad, caps, chain); + if (caps) + gst_caps_unref (caps); + + gst_object_unref (pad); + } + g_list_free (to_connect); + + return res; +} + +/* expose_pad: + * + * Expose the given pad on the chain as a decoded pad. + */ +static void +expose_pad (GstDecodeBin * dbin, GstElement * src, GstDecodePad * dpad, + GstPad * pad, GstCaps * caps, GstDecodeChain * chain) +{ + GstPad *mqpad = NULL; + + GST_DEBUG_OBJECT (dbin, "pad %s:%s, chain:%p", + GST_DEBUG_PAD_NAME (pad), chain); + + /* If this is the first pad for this chain, there are no other elements + * and the source element is not the multiqueue we must link through the + * multiqueue. + * + * This is the case if a demuxer directly exposed a raw pad. + */ + if (chain->parent && !chain->elements && src != chain->parent->multiqueue) { + GST_LOG_OBJECT (src, "connecting the pad through multiqueue"); + + gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), NULL); + if (!(mqpad = gst_decode_group_control_demuxer_pad (chain->parent, pad))) + goto beach; + pad = mqpad; + gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), pad); + } + + gst_decode_pad_activate (dpad, chain); + chain->endpad = gst_object_ref (dpad); + chain->endcaps = gst_caps_ref (caps); + + EXPOSE_LOCK (dbin); + if (gst_decode_chain_is_complete (dbin->decode_chain)) { + gst_decode_bin_expose (dbin); + } + EXPOSE_UNLOCK (dbin); + + if (mqpad) + gst_object_unref (mqpad); + +beach: + return; +} + +static void +type_found (GstElement * typefind, guint probability, + GstCaps * caps, GstDecodeBin * decode_bin) +{ + GstPad *pad, *sink_pad; + + GST_DEBUG_OBJECT (decode_bin, "typefind found caps %" GST_PTR_FORMAT, caps); + + /* If the typefinder (but not something else) finds text/plain - i.e. that's + * the top-level type of the file - then error out. + */ + if (gst_structure_has_name (gst_caps_get_structure (caps, 0), "text/plain")) { + GST_ELEMENT_ERROR (decode_bin, STREAM, WRONG_TYPE, + (_("This appears to be a text file")), + ("decodebin2 cannot decode plain text files")); + goto exit; + } + + /* FIXME: we can only deal with one type, we don't yet support dynamically changing + * caps from the typefind element */ + if (decode_bin->have_type || decode_bin->decode_chain) + goto exit; + + decode_bin->have_type = TRUE; + + pad = gst_element_get_static_pad (typefind, "src"); + sink_pad = gst_element_get_static_pad (typefind, "sink"); + + /* need some lock here to prevent race with shutdown state change + * which might yank away e.g. decode_chain while building stuff here. + * In typical cases, STREAM_LOCK is held and handles that, it need not + * be held (if called from a proxied setcaps), so grab it anyway */ + GST_PAD_STREAM_LOCK (sink_pad); + decode_bin->decode_chain = gst_decode_chain_new (decode_bin, NULL, pad); + analyze_new_pad (decode_bin, typefind, pad, caps, decode_bin->decode_chain); + GST_PAD_STREAM_UNLOCK (sink_pad); + + gst_object_unref (sink_pad); + gst_object_unref (pad); + +exit: + return; +} + +static gboolean +pad_event_cb (GstPad * pad, GstEvent * event, gpointer data) +{ + GstPendingPad *ppad = (GstPendingPad *) data; + GstDecodeChain *chain = ppad->chain; + GstDecodeBin *dbin = chain->dbin; + + g_assert (ppad); + g_assert (chain); + g_assert (dbin); + switch (GST_EVENT_TYPE (event)) { + case GST_EVENT_EOS: + GST_DEBUG_OBJECT (dbin, "Received EOS on a non final pad, this stream " + "ended too early"); + chain->deadend = TRUE; + /* we don't set the endcaps because NULL endcaps means early EOS */ + EXPOSE_LOCK (dbin); + if (gst_decode_chain_is_complete (dbin->decode_chain)) + gst_decode_bin_expose (dbin); + EXPOSE_UNLOCK (dbin); + break; + default: + break; + } + return TRUE; +} + +static void +pad_added_cb (GstElement * element, GstPad * pad, GstDecodeChain * chain) +{ + GstCaps *caps; + GstDecodeBin *dbin; + + dbin = chain->dbin; + + GST_DEBUG_OBJECT (pad, "pad added, chain:%p", chain); + + caps = get_pad_caps (pad); + analyze_new_pad (dbin, element, pad, caps, chain); + if (caps) + gst_caps_unref (caps); + + EXPOSE_LOCK (dbin); + if (gst_decode_chain_is_complete (dbin->decode_chain)) { + GST_LOG_OBJECT (dbin, + "That was the last dynamic object, now attempting to expose the group"); + if (!gst_decode_bin_expose (dbin)) + GST_WARNING_OBJECT (dbin, "Couldn't expose group"); + } + EXPOSE_UNLOCK (dbin); +} + +static void +pad_removed_cb (GstElement * element, GstPad * pad, GstDecodeChain * chain) +{ + GList *l; + + GST_LOG_OBJECT (pad, "pad removed, chain:%p", chain); + + /* In fact, we don't have to do anything here, the active group will be + * removed when the group's multiqueue is drained */ + CHAIN_MUTEX_LOCK (chain); + for (l = chain->pending_pads; l; l = l->next) { + GstPendingPad *ppad = l->data; + GstPad *opad = ppad->pad; + + if (pad == opad) { + g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain); + gst_pending_pad_free (ppad); + chain->pending_pads = g_list_delete_link (chain->pending_pads, l); + break; + } + } + CHAIN_MUTEX_UNLOCK (chain); +} + +static void +no_more_pads_cb (GstElement * element, GstDecodeChain * chain) +{ + GstDecodeGroup *group = NULL; + + GST_LOG_OBJECT (element, "got no more pads"); + + CHAIN_MUTEX_LOCK (chain); + if (!chain->elements || (GstElement *) chain->elements->data != element) { + GST_LOG_OBJECT (chain->dbin, "no-more-pads from old chain element '%s'", + GST_OBJECT_NAME (element)); + CHAIN_MUTEX_UNLOCK (chain); + return; + } else if (!chain->demuxer) { + GST_LOG_OBJECT (chain->dbin, "no-more-pads from a non-demuxer element '%s'", + GST_OBJECT_NAME (element)); + CHAIN_MUTEX_UNLOCK (chain); + return; + } + + /* when we received no_more_pads, we can complete the pads of the chain */ + if (!chain->next_groups && chain->active_group) { + group = chain->active_group; + } else if (chain->next_groups) { + group = chain->next_groups->data; + } + if (!group) { + GST_ERROR_OBJECT (chain->dbin, "can't find group for element"); + CHAIN_MUTEX_UNLOCK (chain); + return; + } + + GST_DEBUG_OBJECT (element, "Setting group %p to complete", group); + + group->no_more_pads = TRUE; + /* this group has prerolled enough to not need more pads, + * we can probably set its buffering state to playing now */ + GST_DEBUG_OBJECT (group->dbin, "Setting group %p multiqueue to " + "'playing' buffering mode", group); + decodebin_set_queue_size (group->dbin, group->multiqueue, FALSE); + CHAIN_MUTEX_UNLOCK (chain); + + EXPOSE_LOCK (chain->dbin); + if (gst_decode_chain_is_complete (chain->dbin->decode_chain)) { + gst_decode_bin_expose (chain->dbin); + } + EXPOSE_UNLOCK (chain->dbin); +} + +static void +caps_notify_cb (GstPad * pad, GParamSpec * unused, GstDecodeChain * chain) +{ + GstElement *element; + GList *l; + + GST_LOG_OBJECT (pad, "Notified caps for pad %s:%s", GST_DEBUG_PAD_NAME (pad)); + + /* Disconnect this; if we still need it, we'll reconnect to this in + * analyze_new_pad */ + g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain); + + element = GST_ELEMENT_CAST (gst_pad_get_parent (pad)); + + CHAIN_MUTEX_LOCK (chain); + for (l = chain->pending_pads; l; l = l->next) { + GstPendingPad *ppad = l->data; + if (ppad->pad == pad) { + gst_pending_pad_free (ppad); + chain->pending_pads = g_list_delete_link (chain->pending_pads, l); + break; + } + } + CHAIN_MUTEX_UNLOCK (chain); + + pad_added_cb (element, pad, chain); + + gst_object_unref (element); +} + +/* Decide whether an element is a demuxer based on the + * klass and number/type of src pad templates it has */ +static gboolean +is_demuxer_element (GstElement * srcelement) +{ + GstElementFactory *srcfactory; + GstElementClass *elemclass; + GList *walk; + const gchar *klass; + gint potential_src_pads = 0; + + srcfactory = gst_element_get_factory (srcelement); + klass = gst_element_factory_get_klass (srcfactory); + + /* Can't be a demuxer unless it has Demux in the klass name */ + if (!strstr (klass, "Demux")) + return FALSE; + + /* Walk the src pad templates and count how many the element + * might produce */ + elemclass = GST_ELEMENT_GET_CLASS (srcelement); + + walk = gst_element_class_get_pad_template_list (elemclass); + while (walk != NULL) { + GstPadTemplate *templ; + + templ = (GstPadTemplate *) walk->data; + if (GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SRC) { + switch (GST_PAD_TEMPLATE_PRESENCE (templ)) { + case GST_PAD_ALWAYS: + case GST_PAD_SOMETIMES: + if (strstr (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ), "%")) + potential_src_pads += 2; /* Might make multiple pads */ + else + potential_src_pads += 1; + break; + case GST_PAD_REQUEST: + potential_src_pads += 2; + break; + } + } + walk = g_list_next (walk); + } + + if (potential_src_pads < 2) + return FALSE; + + return TRUE; +} + +/* Returns TRUE if the caps are compatible with the caps specified in the 'caps' + * property (which by default are the raw caps) + * + * The decodebin_lock should be taken ! + */ +static gboolean +are_final_caps (GstDecodeBin * dbin, GstCaps * caps) +{ + gboolean res; + + GST_LOG_OBJECT (dbin, "Checking with caps %" GST_PTR_FORMAT, caps); + + /* lock for getting the caps */ + GST_OBJECT_LOCK (dbin); + res = gst_caps_can_intersect (dbin->caps, caps); + GST_OBJECT_UNLOCK (dbin); + + GST_LOG_OBJECT (dbin, "Caps are %sfinal caps", res ? "" : "not "); + + return res; +} + +/**** + * GstDecodeChain functions + ****/ + +/* gst_decode_chain_get_current_group: + * + * Returns the current group of this chain, to which + * new chains should be attached or NULL if the last + * group didn't have no-more-pads. + * + * Not MT-safe: Call with parent chain lock! + */ +static GstDecodeGroup * +gst_decode_chain_get_current_group (GstDecodeChain * chain) +{ + GstDecodeGroup *group; + + if (!chain->next_groups && chain->active_group + && chain->active_group->overrun && !chain->active_group->no_more_pads) { + GST_WARNING_OBJECT (chain->dbin, + "Currently active group %p is exposed" + " and wants to add a new pad without having signaled no-more-pads", + chain->active_group); + return NULL; + } + + if (chain->next_groups && (group = chain->next_groups->data) && group->overrun + && !group->no_more_pads) { + GST_WARNING_OBJECT (chain->dbin, + "Currently newest pending group %p " + "had overflow but didn't signal no-more-pads", group); + return NULL; + } + + /* Now we know that we can really return something useful */ + if (!chain->active_group) { + chain->active_group = group = gst_decode_group_new (chain->dbin, chain); + } else if (!chain->active_group->overrun + && !chain->active_group->no_more_pads) { + group = chain->active_group; + } else if (chain->next_groups && (group = chain->next_groups->data) + && !group->overrun && !group->no_more_pads) { + /* group = chain->next_groups->data */ + } else { + group = gst_decode_group_new (chain->dbin, chain); + chain->next_groups = g_list_prepend (chain->next_groups, group); + } + + return group; +} + +static void gst_decode_group_free_internal (GstDecodeGroup * group, + gboolean hide); + +static void +gst_decode_chain_free_internal (GstDecodeChain * chain, gboolean hide) +{ + GList *l; + + CHAIN_MUTEX_LOCK (chain); + + GST_DEBUG_OBJECT (chain->dbin, "%s chain %p", (hide ? "Hiding" : "Freeing"), + chain); + + if (chain->active_group) { + gst_decode_group_free_internal (chain->active_group, hide); + if (!hide) + chain->active_group = NULL; + } + + for (l = chain->next_groups; l; l = l->next) { + gst_decode_group_free_internal ((GstDecodeGroup *) l->data, hide); + if (!hide) + l->data = NULL; + } + if (!hide) { + g_list_free (chain->next_groups); + chain->next_groups = NULL; + } + + if (!hide) { + for (l = chain->old_groups; l; l = l->next) { + GstDecodeGroup *group = l->data; + + gst_decode_group_free (group); + } + g_list_free (chain->old_groups); + chain->old_groups = NULL; + } + + for (l = chain->pending_pads; l; l = l->next) { + GstPendingPad *ppad = l->data; + GstPad *pad = ppad->pad; + + g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain); + gst_pending_pad_free (ppad); + l->data = NULL; + } + g_list_free (chain->pending_pads); + chain->pending_pads = NULL; + + for (l = chain->elements; l; l = l->next) { + GstElement *element = GST_ELEMENT (l->data); + + g_signal_handlers_disconnect_by_func (element, pad_added_cb, chain); + g_signal_handlers_disconnect_by_func (element, pad_removed_cb, chain); + g_signal_handlers_disconnect_by_func (element, no_more_pads_cb, chain); + + if (GST_OBJECT_PARENT (element) == GST_OBJECT_CAST (chain->dbin)) + gst_bin_remove (GST_BIN_CAST (chain->dbin), element); + if (!hide) { + gst_element_set_state (element, GST_STATE_NULL); + } + + SUBTITLE_LOCK (chain->dbin); + /* remove possible subtitle element */ + chain->dbin->subtitles = g_list_remove (chain->dbin->subtitles, element); + SUBTITLE_UNLOCK (chain->dbin); + + if (!hide) { + gst_object_unref (element); + l->data = NULL; + } + } + if (!hide) { + g_list_free (chain->elements); + chain->elements = NULL; + } + + if (chain->endpad) { + if (chain->endpad->exposed) { + gst_element_remove_pad (GST_ELEMENT_CAST (chain->dbin), + GST_PAD_CAST (chain->endpad)); + g_signal_emit (G_OBJECT (chain->dbin), + gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD], 0, chain->endpad); + } + + gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (chain->endpad), NULL); + chain->endpad->exposed = FALSE; + if (!hide) { + gst_object_unref (chain->endpad); + chain->endpad = NULL; + } + } + + if (chain->pad) { + gst_object_unref (chain->pad); + chain->pad = NULL; + } + + if (chain->endcaps) { + gst_caps_unref (chain->endcaps); + chain->endcaps = NULL; + } + + GST_DEBUG_OBJECT (chain->dbin, "%s chain %p", (hide ? "Hidden" : "Freed"), + chain); + CHAIN_MUTEX_UNLOCK (chain); + if (!hide) { + g_mutex_free (chain->lock); + g_slice_free (GstDecodeChain, chain); + } +} + +/* gst_decode_chain_free: + * + * Completely frees and removes the chain and all + * child groups from decodebin2. + * + * MT-safe, don't hold the chain lock or any child chain's lock + * when calling this! + */ +static void +gst_decode_chain_free (GstDecodeChain * chain) +{ + gst_decode_chain_free_internal (chain, FALSE); +} + +/* gst_decode_chain_new: + * + * Creates a new decode chain and initializes it. + * + * It's up to the caller to add it to the list of child chains of + * a group! + */ +static GstDecodeChain * +gst_decode_chain_new (GstDecodeBin * dbin, GstDecodeGroup * parent, + GstPad * pad) +{ + GstDecodeChain *chain = g_slice_new0 (GstDecodeChain); + + GST_DEBUG_OBJECT (dbin, "Creating new chain %p with parent group %p", chain, + parent); + + chain->dbin = dbin; + chain->parent = parent; + chain->lock = g_mutex_new (); + chain->pad = gst_object_ref (pad); + + return chain; +} + +/**** + * GstDecodeGroup functions + ****/ + +/* The overrun callback is used to expose groups that have not yet had their + * no_more_pads called while the (large) multiqueue overflowed. When this + * happens we must assume that the no_more_pads will not arrive anymore and we + * must expose the pads that we have. + */ +static void +multi_queue_overrun_cb (GstElement * queue, GstDecodeGroup * group) +{ + GstDecodeBin *dbin; + + dbin = group->dbin; + + GST_LOG_OBJECT (dbin, "multiqueue '%s' (%p) is full", GST_OBJECT_NAME (queue), + queue); + + group->overrun = TRUE; + + /* FIXME: We should make sure that everything gets exposed now + * even if child chains are not complete because the will never + * be complete! Ignore any non-complete chains when exposing + * and never expose them later + */ + + EXPOSE_LOCK (dbin); + if (gst_decode_chain_is_complete (dbin->decode_chain)) { + if (!gst_decode_bin_expose (dbin)) + GST_WARNING_OBJECT (dbin, "Couldn't expose group"); + } + EXPOSE_UNLOCK (group->dbin); +} + +static void +gst_decode_group_free_internal (GstDecodeGroup * group, gboolean hide) +{ + GList *l; + + GST_DEBUG_OBJECT (group->dbin, "%s group %p", (hide ? "Hiding" : "Freeing"), + group); + for (l = group->children; l; l = l->next) { + GstDecodeChain *chain = (GstDecodeChain *) l->data; + + gst_decode_chain_free_internal (chain, hide); + if (!hide) + l->data = NULL; + } + if (!hide) { + g_list_free (group->children); + group->children = NULL; + } + + if (!hide) { + for (l = group->reqpads; l; l = l->next) { + GstPad *pad = l->data; + + gst_element_release_request_pad (group->multiqueue, pad); + gst_object_unref (pad); + l->data = NULL; + } + g_list_free (group->reqpads); + group->reqpads = NULL; + } + + if (group->multiqueue) { + if (group->overrunsig) { + g_signal_handler_disconnect (group->multiqueue, group->overrunsig); + group->overrunsig = 0; + } + + if (GST_OBJECT_PARENT (group->multiqueue) == GST_OBJECT_CAST (group->dbin)) + gst_bin_remove (GST_BIN_CAST (group->dbin), group->multiqueue); + if (!hide) { + gst_element_set_state (group->multiqueue, GST_STATE_NULL); + gst_object_unref (group->multiqueue); + group->multiqueue = NULL; + } + } + + GST_DEBUG_OBJECT (group->dbin, "%s group %p", (hide ? "Hided" : "Freed"), + group); + if (!hide) + g_slice_free (GstDecodeGroup, group); +} + +/* gst_decode_group_free: + * + * Completely frees and removes the decode group and all + * it's children. + * + * Never call this from any streaming thread! + * + * Not MT-safe, call with parent's chain lock! + */ +static void +gst_decode_group_free (GstDecodeGroup * group) +{ + gst_decode_group_free_internal (group, FALSE); +} + +/* gst_decode_group_hide: + * + * Hide the decode group only, this means that + * all child endpads are removed from decodebin2 + * and all signals are unconnected. + * + * No element is set to NULL state and completely + * unrefed here. + * + * Can be called from streaming threads. + * + * Not MT-safe, call with parent's chain lock! + */ +static void +gst_decode_group_hide (GstDecodeGroup * group) +{ + gst_decode_group_free_internal (group, TRUE); +} + +/* configure queue sizes, this depends on the buffering method and if we are + * playing or prerolling. */ +static void +decodebin_set_queue_size (GstDecodeBin * dbin, GstElement * multiqueue, + gboolean preroll) +{ + guint max_bytes, max_buffers; + guint64 max_time; + + if (preroll || dbin->use_buffering) { + /* takes queue limits, initially we only queue up up to the max bytes limit, + * with a default of 2MB. we use the same values for buffering mode. */ + if ((max_bytes = dbin->max_size_bytes) == 0) + max_bytes = AUTO_PREROLL_SIZE_BYTES; + if ((max_buffers = dbin->max_size_buffers) == 0) + max_buffers = AUTO_PREROLL_SIZE_BUFFERS; + if ((max_time = dbin->max_size_time) == 0) + max_time = AUTO_PREROLL_SIZE_TIME; + } else { + /* update runtime limits. At runtime, we try to keep the amount of buffers + * in the queues as low as possible (but at least 5 buffers). */ + if ((max_bytes = dbin->max_size_bytes) == 0) + max_bytes = AUTO_PLAY_SIZE_BYTES; + if ((max_buffers = dbin->max_size_buffers) == 0) + max_buffers = AUTO_PLAY_SIZE_BUFFERS; + if ((max_time = dbin->max_size_time) == 0) + max_time = AUTO_PLAY_SIZE_TIME; + } + + g_object_set (multiqueue, + "max-size-bytes", max_bytes, "max-size-time", max_time, + "max-size-buffers", max_buffers, NULL); +} + +/* gst_decode_group_new: + * @dbin: Parent decodebin + * @parent: Parent chain or %NULL + * + * Creates a new GstDecodeGroup. It is up to the caller to add it to the list + * of groups. + */ +static GstDecodeGroup * +gst_decode_group_new (GstDecodeBin * dbin, GstDecodeChain * parent) +{ + GstDecodeGroup *group = g_slice_new0 (GstDecodeGroup); + GstElement *mq; + + GST_DEBUG_OBJECT (dbin, "Creating new group %p with parent chain %p", group, + parent); + + group->dbin = dbin; + group->parent = parent; + + mq = group->multiqueue = gst_element_factory_make ("multiqueue", NULL); + if (G_UNLIKELY (!group->multiqueue)) + goto missing_multiqueue; + + /* default is for use-buffering is FALSE */ + if (dbin->use_buffering) { + g_object_set (mq, + "use-buffering", TRUE, + "low-percent", dbin->low_percent, + "high-percent", dbin->high_percent, NULL); + } + + /* configure queue sizes for preroll */ + decodebin_set_queue_size (dbin, mq, TRUE); + + group->overrunsig = g_signal_connect (G_OBJECT (mq), "overrun", + G_CALLBACK (multi_queue_overrun_cb), group); + + gst_bin_add (GST_BIN (dbin), gst_object_ref (mq)); + gst_element_set_state (mq, GST_STATE_PAUSED); + + return group; + + /* ERRORS */ +missing_multiqueue: + { + gst_element_post_message (GST_ELEMENT_CAST (dbin), + gst_missing_element_message_new (GST_ELEMENT_CAST (dbin), + "multiqueue")); + GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL), ("no multiqueue!")); + g_slice_free (GstDecodeGroup, group); + return NULL; + } +} + +/* gst_decode_group_control_demuxer_pad + * + * Adds a new demuxer srcpad to the given group. + * + * Returns the srcpad of the multiqueue corresponding the given pad. + * Returns NULL if there was an error. + */ +static GstPad * +gst_decode_group_control_demuxer_pad (GstDecodeGroup * group, GstPad * pad) +{ + GstDecodeBin *dbin; + GstPad *srcpad, *sinkpad; + GstIterator *it = NULL; + + dbin = group->dbin; + + GST_LOG_OBJECT (dbin, "group:%p pad %s:%s", group, GST_DEBUG_PAD_NAME (pad)); + + srcpad = NULL; + + if (G_UNLIKELY (!group->multiqueue)) + return NULL; + + if (!(sinkpad = gst_element_get_request_pad (group->multiqueue, "sink%d"))) { + GST_ERROR_OBJECT (dbin, "Couldn't get sinkpad from multiqueue"); + return NULL; + } + + if ((gst_pad_link (pad, sinkpad) != GST_PAD_LINK_OK)) { + GST_ERROR_OBJECT (dbin, "Couldn't link demuxer and multiqueue"); + goto error; + } + + it = gst_pad_iterate_internal_links (sinkpad); + + if (!it || (gst_iterator_next (it, (gpointer) & srcpad)) != GST_ITERATOR_OK + || srcpad == NULL) { + GST_ERROR_OBJECT (dbin, + "Couldn't get srcpad from multiqueue for sinkpad %" GST_PTR_FORMAT, + sinkpad); + goto error; + } + + CHAIN_MUTEX_LOCK (group->parent); + group->reqpads = g_list_prepend (group->reqpads, gst_object_ref (sinkpad)); + CHAIN_MUTEX_UNLOCK (group->parent); + +beach: + if (it) + gst_iterator_free (it); + gst_object_unref (sinkpad); + return srcpad; + +error: + gst_element_release_request_pad (group->multiqueue, sinkpad); + goto beach; +} + +/* gst_decode_group_is_complete: + * + * Checks if the group is complete, this means that + * a) overrun of the multiqueue or no-more-pads happened + * b) all child chains are complete + * + * Not MT-safe, always call with decodebin expose lock + */ +static gboolean +gst_decode_group_is_complete (GstDecodeGroup * group) +{ + GList *l; + gboolean complete = TRUE; + + if (!group->overrun && !group->no_more_pads) { + complete = FALSE; + goto out; + } + + for (l = group->children; l; l = l->next) { + GstDecodeChain *chain = l->data; + + if (!gst_decode_chain_is_complete (chain)) { + complete = FALSE; + goto out; + } + } + +out: + GST_DEBUG_OBJECT (group->dbin, "Group %p is complete: %d", group, complete); + return complete; +} + +/* gst_decode_chain_is_complete: + * + * Returns TRUE if the chain is complete, this means either + * a) This chain is a dead end, i.e. we have no suitable plugins + * b) This chain ends in an endpad and this is blocked or exposed + * + * Not MT-safe, always call with decodebin expose lock + */ +static gboolean +gst_decode_chain_is_complete (GstDecodeChain * chain) +{ + gboolean complete = FALSE; + + CHAIN_MUTEX_LOCK (chain); + if (chain->deadend) { + complete = TRUE; + goto out; + } + + if (chain->endpad && (chain->endpad->blocked || chain->endpad->exposed)) { + complete = TRUE; + goto out; + } + + if (chain->demuxer) { + if (chain->active_group + && gst_decode_group_is_complete (chain->active_group)) { + complete = TRUE; + goto out; + } + } + +out: + CHAIN_MUTEX_UNLOCK (chain); + GST_DEBUG_OBJECT (chain->dbin, "Chain %p is complete: %d", chain, complete); + return complete; +} + +/* check if the group is drained, meaning all pads have seen an EOS + * event. */ +static void +gst_decode_pad_handle_eos (GstDecodePad * pad) +{ + GstDecodeChain *chain = pad->chain; + + GST_LOG_OBJECT (pad->dbin, "chain : %p, pad %p", chain, pad); + pad->drained = TRUE; + gst_decode_chain_handle_eos (chain); +} + +/* gst_decode_chain_handle_eos: + * + * Checks if there are next groups in any parent chain + * to which we can switch or if everything is drained. + * + * If there are groups to switch to, hide the current active + * one and expose the new one. + * + * MT-safe, don't call with chain lock! + */ +static void +gst_decode_chain_handle_eos (GstDecodeChain * eos_chain) +{ + GstDecodeBin *dbin = eos_chain->dbin; + GstDecodeGroup *group; + GstDecodeChain *chain = eos_chain; + gboolean drained; + + g_return_if_fail (eos_chain->endpad); + + CHAIN_MUTEX_LOCK (chain); + while ((group = chain->parent)) { + CHAIN_MUTEX_UNLOCK (chain); + chain = group->parent; + CHAIN_MUTEX_LOCK (chain); + + if (gst_decode_group_is_drained (group)) { + continue; + } + break; + } + + drained = chain->active_group ? + gst_decode_group_is_drained (chain->active_group) : TRUE; + + /* Now either group == NULL and chain == dbin->decode_chain + * or chain is the lowest chain that has a non-drained group */ + if (chain->active_group && drained && chain->next_groups) { + GST_DEBUG_OBJECT (dbin, "Hiding current group %p", chain->active_group); + gst_decode_group_hide (chain->active_group); + chain->old_groups = g_list_prepend (chain->old_groups, chain->active_group); + GST_DEBUG_OBJECT (dbin, "Switching to next group %p", + chain->next_groups->data); + chain->active_group = chain->next_groups->data; + chain->next_groups = + g_list_delete_link (chain->next_groups, chain->next_groups); + CHAIN_MUTEX_UNLOCK (chain); + EXPOSE_LOCK (dbin); + if (gst_decode_chain_is_complete (dbin->decode_chain)) + gst_decode_bin_expose (dbin); + EXPOSE_UNLOCK (dbin); + } else if (!chain->active_group || drained) { + g_assert (chain == dbin->decode_chain); + CHAIN_MUTEX_UNLOCK (chain); + + GST_LOG_OBJECT (dbin, "all groups drained, fire signal"); + g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_DRAINED], 0, + NULL); + } else { + CHAIN_MUTEX_UNLOCK (chain); + GST_DEBUG_OBJECT (dbin, + "Current active group in chain %p is not drained yet", chain); + } +} + +/* gst_decode_group_is_drained: + * + * Check is this group is drained and cache this result. + * The group is drained if all child chains are drained. + * + * Not MT-safe, call with group->parent's lock */ +static gboolean +gst_decode_group_is_drained (GstDecodeGroup * group) +{ + GList *l; + gboolean drained = TRUE; + + if (group->drained) { + drained = TRUE; + goto out; + } + + for (l = group->children; l; l = l->next) { + GstDecodeChain *chain = l->data; + + CHAIN_MUTEX_LOCK (chain); + if (!gst_decode_chain_is_drained (chain)) + drained = FALSE; + CHAIN_MUTEX_UNLOCK (chain); + if (!drained) + goto out; + } + group->drained = drained; + +out: + GST_DEBUG_OBJECT (group->dbin, "Group %p is drained: %d", group, drained); + return drained; +} + +/* gst_decode_chain_is_drained: + * + * Check is the chain is drained, which means that + * either + * + * a) it's endpad is drained + * b) there are no pending pads, the active group is drained + * and there are no next groups + * + * Not MT-safe, call with chain lock + */ +static gboolean +gst_decode_chain_is_drained (GstDecodeChain * chain) +{ + gboolean drained = FALSE; + + if (chain->endpad) { + drained = chain->endpad->drained; + goto out; + } + + if (chain->pending_pads) { + drained = FALSE; + goto out; + } + + if (chain->active_group && gst_decode_group_is_drained (chain->active_group) + && !chain->next_groups) { + drained = TRUE; + goto out; + } + +out: + GST_DEBUG_OBJECT (chain->dbin, "Chain %p is drained: %d", chain, drained); + return drained; +} + +/* sort_end_pads: + * GCompareFunc to use with lists of GstPad. + * Sorts pads by mime type. + * First video (raw, then non-raw), then audio (raw, then non-raw), + * then others. + * + * Return: negative if ab + */ +static gint +sort_end_pads (GstDecodePad * da, GstDecodePad * db) +{ + gint va, vb; + GstCaps *capsa, *capsb; + GstStructure *sa, *sb; + const gchar *namea, *nameb; + + capsa = get_pad_caps (GST_PAD_CAST (da)); + capsb = get_pad_caps (GST_PAD_CAST (db)); + + sa = gst_caps_get_structure ((const GstCaps *) capsa, 0); + sb = gst_caps_get_structure ((const GstCaps *) capsb, 0); + + namea = gst_structure_get_name (sa); + nameb = gst_structure_get_name (sb); + + if (g_strrstr (namea, "video/x-raw-")) + va = 0; + else if (g_strrstr (namea, "video/")) + va = 1; + else if (g_strrstr (namea, "audio/x-raw")) + va = 2; + else if (g_strrstr (namea, "audio/")) + va = 3; + else + va = 4; + + if (g_strrstr (nameb, "video/x-raw-")) + vb = 0; + else if (g_strrstr (nameb, "video/")) + vb = 1; + else if (g_strrstr (nameb, "audio/x-raw")) + vb = 2; + else if (g_strrstr (nameb, "audio/")) + vb = 3; + else + vb = 4; + + gst_caps_unref (capsa); + gst_caps_unref (capsb); + + return va - vb; +} + +static GstCaps * +_gst_element_get_linked_caps (GstElement * src, GstElement * sink) +{ + GstIterator *it; + GstElement *parent; + GstPad *pad, *peer; + gboolean done = FALSE; + GstCaps *caps = NULL; + + it = gst_element_iterate_src_pads (src); + while (!done) { + switch (gst_iterator_next (it, (gpointer) & pad)) { + case GST_ITERATOR_OK: + peer = gst_pad_get_peer (pad); + if (peer) { + parent = gst_pad_get_parent_element (peer); + if (parent == sink) { + caps = gst_pad_get_negotiated_caps (pad); + done = TRUE; + } + + if (parent) + gst_object_unref (parent); + gst_object_unref (peer); + } + gst_object_unref (pad); + break; + case GST_ITERATOR_RESYNC: + gst_iterator_resync (it); + break; + case GST_ITERATOR_ERROR: + case GST_ITERATOR_DONE: + done = TRUE; + break; + } + } + + gst_iterator_free (it); + + return caps; +} + +static GQuark topology_structure_name = 0; +static GQuark topology_caps = 0; +static GQuark topology_next = 0; +static GQuark topology_pad = 0; + +/* FIXME: Invent gst_structure_take_structure() to prevent all the + * structure copying for nothing + */ +static GstStructure * +gst_decode_chain_get_topology (GstDecodeChain * chain) +{ + GstStructure *s, *u; + GList *l; + GstCaps *caps; + + if (G_UNLIKELY ((chain->endpad || chain->deadend) + && (chain->endcaps == NULL))) { + GST_WARNING ("End chain without valid caps !"); + return NULL; + } + + u = gst_structure_id_empty_new (topology_structure_name); + + /* Now at the last element */ + if (chain->elements && (chain->endpad || chain->deadend)) { + s = gst_structure_id_empty_new (topology_structure_name); + gst_structure_id_set (u, topology_caps, GST_TYPE_CAPS, chain->endcaps, + NULL); + + if (chain->endpad) + gst_structure_id_set (u, topology_pad, GST_TYPE_PAD, chain->endpad, NULL); + gst_structure_id_set (s, topology_next, GST_TYPE_STRUCTURE, u, NULL); + gst_structure_free (u); + u = s; + } else if (chain->active_group) { + GValue list = { 0, }; + GValue item = { 0, }; + + g_value_init (&list, GST_TYPE_LIST); + g_value_init (&item, GST_TYPE_STRUCTURE); + for (l = chain->active_group->children; l; l = l->next) { + s = gst_decode_chain_get_topology (l->data); + if (s) { + gst_value_set_structure (&item, s); + gst_value_list_append_value (&list, &item); + g_value_reset (&item); + gst_structure_free (s); + } + } + gst_structure_id_set_value (u, topology_next, &list); + g_value_unset (&list); + g_value_unset (&item); + } + + /* Get caps between all elements in this chain */ + l = (chain->elements && chain->elements->next) ? chain->elements : NULL; + for (; l && l->next; l = l->next) { + GstCaps *caps = _gst_element_get_linked_caps (l->next->data, l->data); + + if (caps) { + s = gst_structure_id_empty_new (topology_structure_name); + gst_structure_id_set (u, topology_caps, GST_TYPE_CAPS, caps, NULL); + gst_caps_unref (caps); + + gst_structure_id_set (s, topology_next, GST_TYPE_STRUCTURE, u, NULL); + gst_structure_free (u); + u = s; + } + } + + /* Caps that resulted in this chain */ + caps = gst_pad_get_negotiated_caps (chain->pad); + if (!caps) { + caps = get_pad_caps (chain->pad); + if (G_UNLIKELY (!gst_caps_is_fixed (caps))) { + GST_ERROR_OBJECT (chain->pad, + "Couldn't get fixed caps, got %" GST_PTR_FORMAT, caps); + gst_caps_unref (caps); + caps = NULL; + } + } + gst_structure_set (u, "caps", GST_TYPE_CAPS, caps, NULL); + gst_caps_unref (caps); + + return u; +} + +static void +gst_decode_bin_post_topology_message (GstDecodeBin * dbin) +{ + GstStructure *s; + GstMessage *msg; + + s = gst_decode_chain_get_topology (dbin->decode_chain); + + msg = gst_message_new_element (GST_OBJECT (dbin), s); + gst_element_post_message (GST_ELEMENT (dbin), msg); +} + +/* Must only be called if the toplevel chain is complete and blocked! */ +/* Not MT-safe, call with decodebin expose lock! */ +static gboolean +gst_decode_bin_expose (GstDecodeBin * dbin) +{ + GList *tmp, *endpads = NULL; + gboolean missing_plugin = FALSE; + gboolean already_exposed = TRUE; + + GST_DEBUG_OBJECT (dbin, "Exposing currently active chains/groups"); + + /* Don't expose if we're currently shutting down */ + DYN_LOCK (dbin); + if (G_UNLIKELY (dbin->shutdown == TRUE)) { + GST_WARNING_OBJECT (dbin, "Currently, shutting down, aborting exposing"); + DYN_UNLOCK (dbin); + return FALSE; + } + DYN_UNLOCK (dbin); + + /* Get the pads that we're going to expose and mark things as exposed */ + if (!gst_decode_chain_expose (dbin->decode_chain, &endpads, &missing_plugin)) { + g_list_foreach (endpads, (GFunc) gst_object_unref, NULL); + g_list_free (endpads); + GST_ERROR_OBJECT (dbin, "Broken chain/group tree"); + g_return_val_if_reached (FALSE); + return FALSE; + } + if (endpads == NULL) { + if (missing_plugin) { + GST_WARNING_OBJECT (dbin, "No suitable plugins found"); + GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL), + ("no suitable plugins found")); + } else { + /* in this case, the stream ended without buffers, + * just post a warning */ + GST_WARNING_OBJECT (dbin, "All streams finished without buffers"); + GST_ELEMENT_ERROR (dbin, STREAM, FAILED, (NULL), + ("all streams without buffers")); + } + return FALSE; + } + + /* Check if this was called when everything was exposed already */ + for (tmp = endpads; tmp && already_exposed; tmp = tmp->next) { + GstDecodePad *dpad = tmp->data; + + already_exposed &= dpad->exposed; + if (!already_exposed) + break; + } + if (already_exposed) { + GST_DEBUG_OBJECT (dbin, "Everything was exposed already!"); + g_list_foreach (endpads, (GFunc) gst_object_unref, NULL); + g_list_free (endpads); + return TRUE; + } + + /* Set all already exposed pads to blocked */ + for (tmp = endpads; tmp; tmp = tmp->next) { + GstDecodePad *dpad = tmp->data; + + if (dpad->exposed) { + GST_DEBUG_OBJECT (dpad, "blocking exposed pad"); + gst_decode_pad_set_blocked (dpad, TRUE); + } + } + + /* re-order pads : video, then audio, then others */ + endpads = g_list_sort (endpads, (GCompareFunc) sort_end_pads); + + /* Expose pads */ + for (tmp = endpads; tmp; tmp = tmp->next) { + GstDecodePad *dpad = (GstDecodePad *) tmp->data; + gchar *padname; + + /* 1. rewrite name */ + padname = g_strdup_printf ("src%d", dbin->nbpads); + dbin->nbpads++; + GST_DEBUG_OBJECT (dbin, "About to expose dpad %s as %s", + GST_OBJECT_NAME (dpad), padname); + gst_object_set_name (GST_OBJECT (dpad), padname); + g_free (padname); + + /* 2. activate and add */ + if (!dpad->exposed + && !gst_element_add_pad (GST_ELEMENT (dbin), GST_PAD_CAST (dpad))) { + /* not really fatal, we can try to add the other pads */ + g_warning ("error adding pad to decodebin2"); + continue; + } + dpad->exposed = TRUE; + + /* 3. emit signal */ + GST_DEBUG_OBJECT (dbin, "emitting new-decoded-pad"); + g_signal_emit (G_OBJECT (dbin), + gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD], 0, dpad, + (tmp->next == NULL)); + GST_DEBUG_OBJECT (dbin, "emitted new-decoded-pad"); + } + + /* 4. Signal no-more-pads. This allows the application to hook stuff to the + * exposed pads */ + GST_LOG_OBJECT (dbin, "signalling no-more-pads"); + gst_element_no_more_pads (GST_ELEMENT (dbin)); + + /* 5. Send a custom element message with the stream topology */ + if (dbin->post_stream_topology) + gst_decode_bin_post_topology_message (dbin); + + /* 6. Unblock internal pads. The application should have connected stuff now + * so that streaming can continue. */ + for (tmp = endpads; tmp; tmp = tmp->next) { + GstDecodePad *dpad = (GstDecodePad *) tmp->data; + + GST_DEBUG_OBJECT (dpad, "unblocking"); + gst_decode_pad_unblock (dpad); + GST_DEBUG_OBJECT (dpad, "unblocked"); + gst_object_unref (dpad); + } + g_list_free (endpads); + + do_async_done (dbin); + GST_DEBUG_OBJECT (dbin, "Exposed everything"); + return TRUE; +} + +/* gst_decode_chain_expose: + * + * Check if the chain can be exposed and add all endpads + * to the endpads list. + * + * Also update the active group's multiqueue to the + * runtime limits. + * + * Not MT-safe, call with decodebin expose lock! * + */ +static gboolean +gst_decode_chain_expose (GstDecodeChain * chain, GList ** endpads, + gboolean * missing_plugin) +{ + GstDecodeGroup *group; + GList *l; + GstDecodeBin *dbin; + + if (chain->deadend) { + if (chain->endcaps) + *missing_plugin = TRUE; + return TRUE; + } + + if (chain->endpad) { + if (!chain->endpad->blocked && !chain->endpad->exposed) + return FALSE; + *endpads = g_list_prepend (*endpads, gst_object_ref (chain->endpad)); + return TRUE; + } + + group = chain->active_group; + if (!group) + return FALSE; + if (!group->no_more_pads && !group->overrun) + return FALSE; + + dbin = group->dbin; + + /* configure queues for playback */ + decodebin_set_queue_size (dbin, group->multiqueue, FALSE); + + /* we can now disconnect any overrun signal, which is used to expose the + * group. */ + if (group->overrunsig) { + GST_LOG_OBJECT (dbin, "Disconnecting overrun"); + g_signal_handler_disconnect (group->multiqueue, group->overrunsig); + group->overrunsig = 0; + } + + for (l = group->children; l; l = l->next) { + GstDecodeChain *childchain = l->data; + + if (!gst_decode_chain_expose (childchain, endpads, missing_plugin)) + return FALSE; + } + + return TRUE; +} + +/************************* + * GstDecodePad functions + *************************/ + +static void +gst_decode_pad_class_init (GstDecodePadClass * klass) +{ +} + +static void +gst_decode_pad_init (GstDecodePad * pad) +{ + pad->chain = NULL; + pad->blocked = FALSE; + pad->exposed = FALSE; + pad->drained = FALSE; + gst_object_ref (pad); + gst_object_sink (pad); +} + +static void +source_pad_blocked_cb (GstPad * pad, gboolean blocked, GstDecodePad * dpad) +{ + GstDecodeChain *chain; + GstDecodeBin *dbin; + + chain = dpad->chain; + dbin = chain->dbin; + + GST_LOG_OBJECT (dpad, "blocked:%d, dpad->chain:%p", blocked, chain); + + dpad->blocked = blocked; + + if (dpad->blocked) { + EXPOSE_LOCK (dbin); + if (gst_decode_chain_is_complete (dbin->decode_chain)) { + if (!gst_decode_bin_expose (dbin)) + GST_WARNING_OBJECT (dbin, "Couldn't expose group"); + } + EXPOSE_UNLOCK (dbin); + } +} + +static gboolean +source_pad_event_probe (GstPad * pad, GstEvent * event, GstDecodePad * dpad) +{ + GST_LOG_OBJECT (pad, "%s dpad:%p", GST_EVENT_TYPE_NAME (event), dpad); + + if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) { + GST_DEBUG_OBJECT (pad, "we received EOS"); + + /* Check if all pads are drained. If there is a next group to expose, we + * will remove the ghostpad of the current group first, which unlinks the + * peer and so drops the EOS. */ + gst_decode_pad_handle_eos (dpad); + } + /* never drop events */ + return TRUE; +} + +static void +gst_decode_pad_set_blocked (GstDecodePad * dpad, gboolean blocked) +{ + GstDecodeBin *dbin = dpad->dbin; + GstPad *opad; + + DYN_LOCK (dbin); + + GST_DEBUG_OBJECT (dpad, "blocking pad: %d", blocked); + + opad = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (dpad)); + if (!opad) + goto out; + + /* do not block if shutting down. + * we do not consider/expect it blocked further below, but use other trick */ + if (!blocked || !dbin->shutdown) + gst_pad_set_blocked_async_full (opad, blocked, + (GstPadBlockCallback) source_pad_blocked_cb, gst_object_ref (dpad), + (GDestroyNotify) gst_object_unref); + + if (blocked) { + if (dbin->shutdown) { + /* deactivate to force flushing state to prevent NOT_LINKED errors */ + gst_pad_set_active (GST_PAD_CAST (dpad), FALSE); + /* note that deactivating the target pad would have no effect here, + * since elements are typically connected first (and pads exposed), + * and only then brought to PAUSED state (so pads activated) */ + } else { + gst_object_ref (dpad); + dbin->blocked_pads = g_list_prepend (dbin->blocked_pads, dpad); + } + } else { + GList *l; + + if ((l = g_list_find (dbin->blocked_pads, dpad))) { + gst_object_unref (dpad); + dbin->blocked_pads = g_list_delete_link (dbin->blocked_pads, l); + } + } + gst_object_unref (opad); +out: + DYN_UNLOCK (dbin); +} + +static void +gst_decode_pad_add_drained_check (GstDecodePad * dpad) +{ + gst_pad_add_event_probe (GST_PAD_CAST (dpad), + G_CALLBACK (source_pad_event_probe), dpad); +} + +static void +gst_decode_pad_activate (GstDecodePad * dpad, GstDecodeChain * chain) +{ + g_return_if_fail (chain != NULL); + + dpad->chain = chain; + gst_pad_set_active (GST_PAD_CAST (dpad), TRUE); + gst_decode_pad_set_blocked (dpad, TRUE); + gst_decode_pad_add_drained_check (dpad); +} + +static void +gst_decode_pad_unblock (GstDecodePad * dpad) +{ + gst_decode_pad_set_blocked (dpad, FALSE); +} + +/*gst_decode_pad_new: + * + * Creates a new GstDecodePad for the given pad. + */ +static GstDecodePad * +gst_decode_pad_new (GstDecodeBin * dbin, GstPad * pad, GstDecodeChain * chain) +{ + GstDecodePad *dpad; + GstPadTemplate *pad_tmpl; + + GST_DEBUG_OBJECT (dbin, "making new decodepad"); + pad_tmpl = gst_static_pad_template_get (&decoder_bin_src_template); + dpad = + g_object_new (GST_TYPE_DECODE_PAD, "direction", GST_PAD_DIRECTION (pad), + "template", pad_tmpl, NULL); + gst_ghost_pad_construct (GST_GHOST_PAD_CAST (dpad)); + gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), pad); + dpad->chain = chain; + dpad->dbin = dbin; + gst_object_unref (pad_tmpl); + + return dpad; +} + +static void +gst_pending_pad_free (GstPendingPad * ppad) +{ + g_assert (ppad); + g_assert (ppad->pad); + + if (ppad->event_probe_id != 0) + gst_pad_remove_event_probe (ppad->pad, ppad->event_probe_id); + gst_object_unref (ppad->pad); + g_slice_free (GstPendingPad, ppad); +} + +/***** + * Element add/remove + *****/ + +static void +do_async_start (GstDecodeBin * dbin) +{ + GstMessage *message; + + dbin->async_pending = TRUE; + + message = gst_message_new_async_start (GST_OBJECT_CAST (dbin), FALSE); + parent_class->handle_message (GST_BIN_CAST (dbin), message); +} + +static void +do_async_done (GstDecodeBin * dbin) +{ + GstMessage *message; + + if (dbin->async_pending) { + message = gst_message_new_async_done (GST_OBJECT_CAST (dbin)); + parent_class->handle_message (GST_BIN_CAST (dbin), message); + + dbin->async_pending = FALSE; + } +} + +/***** + * convenience functions + *****/ + +/* find_sink_pad + * + * Returns the first sink pad of the given element, or NULL if it doesn't have + * any. + */ + +static GstPad * +find_sink_pad (GstElement * element) +{ + GstIterator *it; + GstPad *pad = NULL; + gpointer point; + + it = gst_element_iterate_sink_pads (element); + + if ((gst_iterator_next (it, &point)) == GST_ITERATOR_OK) + pad = (GstPad *) point; + + gst_iterator_free (it); + + return pad; +} + +/* call with dyn_lock held */ +static void +unblock_pads (GstDecodeBin * dbin) +{ + GList *tmp; + + GST_LOG_OBJECT (dbin, "unblocking pads"); + + for (tmp = dbin->blocked_pads; tmp; tmp = tmp->next) { + GstDecodePad *dpad = (GstDecodePad *) tmp->data; + GstPad *opad; + + opad = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (dpad)); + if (!opad) + continue; + + GST_DEBUG_OBJECT (dpad, "unblocking"); + gst_pad_set_blocked_async_full (opad, FALSE, + (GstPadBlockCallback) source_pad_blocked_cb, gst_object_ref (dpad), + (GDestroyNotify) gst_object_unref); + /* make flushing, prevent NOT_LINKED */ + GST_PAD_SET_FLUSHING (GST_PAD_CAST (dpad)); + gst_object_unref (dpad); + gst_object_unref (opad); + GST_DEBUG_OBJECT (dpad, "unblocked"); + } + + /* clear, no more blocked pads */ + g_list_free (dbin->blocked_pads); + dbin->blocked_pads = NULL; +} + +static GstStateChangeReturn +gst_decode_bin_change_state (GstElement * element, GstStateChange transition) +{ + GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; + GstDecodeBin *dbin = GST_DECODE_BIN (element); + + switch (transition) { + case GST_STATE_CHANGE_NULL_TO_READY: + if (dbin->typefind == NULL) + goto missing_typefind; + break; + case GST_STATE_CHANGE_READY_TO_PAUSED: + /* Make sure we've cleared all existing chains */ + if (dbin->decode_chain) { + gst_decode_chain_free (dbin->decode_chain); + dbin->decode_chain = NULL; + } + DYN_LOCK (dbin); + GST_LOG_OBJECT (dbin, "clearing shutdown flag"); + dbin->shutdown = FALSE; + DYN_UNLOCK (dbin); + dbin->have_type = FALSE; + ret = GST_STATE_CHANGE_ASYNC; + do_async_start (dbin); + break; + case GST_STATE_CHANGE_PAUSED_TO_READY: + DYN_LOCK (dbin); + GST_LOG_OBJECT (dbin, "setting shutdown flag"); + dbin->shutdown = TRUE; + unblock_pads (dbin); + DYN_UNLOCK (dbin); + default: + break; + } + + { + GstStateChangeReturn bret; + + bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); + if (G_UNLIKELY (bret == GST_STATE_CHANGE_FAILURE)) + goto activate_failed; + else if (G_UNLIKELY (bret == GST_STATE_CHANGE_NO_PREROLL)) { + do_async_done (dbin); + ret = bret; + } + } + switch (transition) { + case GST_STATE_CHANGE_PAUSED_TO_READY: + do_async_done (dbin); + if (dbin->decode_chain) { + gst_decode_chain_free (dbin->decode_chain); + dbin->decode_chain = NULL; + } + break; + case GST_STATE_CHANGE_READY_TO_NULL: + default: + break; + } + + return ret; + +/* ERRORS */ +missing_typefind: + { + gst_element_post_message (element, + gst_missing_element_message_new (element, "typefind")); + GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL), ("no typefind!")); + return GST_STATE_CHANGE_FAILURE; + } +activate_failed: + { + GST_DEBUG_OBJECT (element, + "element failed to change states -- activation problem?"); + return GST_STATE_CHANGE_FAILURE; + } +} + +gboolean +gst_decode_bin_plugin_init (GstPlugin * plugin) +{ + GST_DEBUG_CATEGORY_INIT (gst_decode_bin_debug, "decodebin2", 0, + "decoder bin"); + +#ifdef ENABLE_NLS + GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE, + LOCALEDIR); + bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR); + bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8"); +#endif /* ENABLE_NLS */ + + /* Register some quarks here for the stream topology message */ + topology_structure_name = g_quark_from_static_string ("stream-topology"); + topology_caps = g_quark_from_static_string ("caps"); + topology_next = g_quark_from_static_string ("next"); + topology_pad = g_quark_from_static_string ("pad"); + + return gst_element_register (plugin, "decodebin2", GST_RANK_NONE, + GST_TYPE_DECODE_BIN); +}