--- /dev/null
+/* GStreamer
+ *
+ * gstv4lmjpegsrc.c: hardware MJPEG video source plugin
+ *
+ * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#include "v4lmjpegsrc_calls.h"
+
+GST_DEBUG_CATEGORY (v4lmjpegsrc_debug);
+#define GST_CAT_DEFAULT v4lmjpegsrc_debug
+
+/* V4lMjpegSrc signals and args */
+enum
+{
+ SIGNAL_FRAME_CAPTURE,
+ SIGNAL_FRAME_DROP,
+ SIGNAL_FRAME_INSERT,
+ SIGNAL_FRAME_LOST,
+ LAST_SIGNAL
+};
+
+/* arguments */
+enum
+{
+ ARG_0,
+#if 0
+ ARG_X_OFFSET,
+ ARG_Y_OFFSET,
+ ARG_F_WIDTH,
+ ARG_F_HEIGHT,
+ /* normally, we would want to use subframe capture, however,
+ * for the time being it's easier if we disable it first */
+#endif
+ ARG_QUALITY,
+ ARG_NUMBUFS,
+ ARG_BUFSIZE,
+ ARG_USE_FIXED_FPS
+};
+
+GST_FORMATS_FUNCTION (GstPad *, gst_v4lmjpegsrc_get_formats,
+ GST_FORMAT_TIME, GST_FORMAT_DEFAULT);
+GST_QUERY_TYPE_FUNCTION (GstPad *, gst_v4lmjpegsrc_get_query_types,
+ GST_QUERY_POSITION);
+
+/* init functions */
+static void gst_v4lmjpegsrc_base_init (gpointer g_class);
+static void gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass * klass);
+static void gst_v4lmjpegsrc_init (GstV4lMjpegSrc * v4lmjpegsrc);
+
+/* pad/info functions */
+static gboolean gst_v4lmjpegsrc_src_convert (GstPad * pad,
+ GstFormat src_format,
+ gint64 src_value, GstFormat * dest_format, gint64 * dest_value);
+static gboolean gst_v4lmjpegsrc_src_query (GstPad * pad,
+ GstQueryType type, GstFormat * format, gint64 * value);
+
+/* buffer functions */
+static GstPadLinkReturn gst_v4lmjpegsrc_srcconnect (GstPad * pad,
+ const GstCaps * caps);
+static GstData *gst_v4lmjpegsrc_get (GstPad * pad);
+static GstCaps *gst_v4lmjpegsrc_getcaps (GstPad * pad);
+
+/* get/set params */
+static void gst_v4lmjpegsrc_set_property (GObject * object,
+ guint prop_id, const GValue * value, GParamSpec * pspec);
+static void gst_v4lmjpegsrc_get_property (GObject * object,
+ guint prop_id, GValue * value, GParamSpec * pspec);
+
+/* set_clock function for A/V sync */
+static void gst_v4lmjpegsrc_set_clock (GstElement * element, GstClock * clock);
+
+/* state handling */
+static GstStateChangeReturn gst_v4lmjpegsrc_change_state (GstElement * element);
+
+/* requeue buffer after use */
+static void gst_v4lmjpegsrc_buffer_free (GstBuffer * buffer);
+
+static GstElementClass *parent_class = NULL;
+static guint gst_v4lmjpegsrc_signals[LAST_SIGNAL] = { 0 };
+
+
+GType
+gst_v4lmjpegsrc_get_type (void)
+{
+ static GType v4lmjpegsrc_type = 0;
+
+ if (!v4lmjpegsrc_type) {
+ static const GTypeInfo v4lmjpegsrc_info = {
+ sizeof (GstV4lMjpegSrcClass),
+ gst_v4lmjpegsrc_base_init,
+ NULL,
+ (GClassInitFunc) gst_v4lmjpegsrc_class_init,
+ NULL,
+ NULL,
+ sizeof (GstV4lMjpegSrc),
+ 0,
+ (GInstanceInitFunc) gst_v4lmjpegsrc_init,
+ NULL
+ };
+
+ v4lmjpegsrc_type =
+ g_type_register_static (GST_TYPE_V4LELEMENT, "GstV4lMjpegSrc",
+ &v4lmjpegsrc_info, 0);
+ }
+ return v4lmjpegsrc_type;
+}
+
+
+static void
+gst_v4lmjpegsrc_base_init (gpointer g_class)
+{
+ static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("image/jpeg, "
+ "width = (int) [ 0, MAX ], "
+ "height = (int) [ 0, MAX ], " "framerate = (fraction) [ 0, MAX ]")
+ );
+ GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
+
+ gst_element_class_set_details_sinmple (gstelement_class,
+ "Video (video4linux/MJPEG) Source", "Source/Video",
+ "Reads MJPEG-encoded frames from a zoran MJPEG/video4linux device",
+ "GStreamer maintainers <gstreamer-devel@lists.sourceforge.net>");
+
+ gst_element_class_add_pad_template (gstelement_class,
+ gst_static_pad_template_get (&src_template));
+}
+
+static void
+gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass * klass)
+{
+ GObjectClass *gobject_class;
+ GstElementClass *gstelement_class;
+
+ gobject_class = (GObjectClass *) klass;
+ gstelement_class = (GstElementClass *) klass;
+
+ parent_class = g_type_class_peek_parent (klass);
+
+#if 0
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_X_OFFSET,
+ g_param_spec_int ("x-offset", "x_offset", "x_offset",
+ G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_Y_OFFSET,
+ g_param_spec_int ("y-offset", "y_offset", "y_offset",
+ G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_F_WIDTH,
+ g_param_spec_int ("frame-width", "frame_width", "frame_width",
+ G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_F_HEIGHT,
+ g_param_spec_int ("frame-height", "frame_height", "frame_height",
+ G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
+#endif
+
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_QUALITY,
+ g_param_spec_int ("quality", "Quality", "JPEG frame quality",
+ 1, 100, 50, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_NUMBUFS,
+ g_param_spec_int ("num-buffers", "Num Buffers", "Number of Buffers",
+ 1, 256, 64, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BUFSIZE,
+ g_param_spec_int ("buffer-size", "Buffer Size", "Size of buffers",
+ 0, 512 * 1024, 128 * 1024,
+ G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_USE_FIXED_FPS,
+ g_param_spec_boolean ("use-fixed-fps", "Use Fixed FPS",
+ "Drop/Insert frames to reach a certain FPS (TRUE) "
+ "or adapt FPS to suit the number of grabbed frames",
+ TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+ /* signals */
+ gst_v4lmjpegsrc_signals[SIGNAL_FRAME_CAPTURE] =
+ g_signal_new ("frame-capture", G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_capture),
+ NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
+ gst_v4lmjpegsrc_signals[SIGNAL_FRAME_DROP] =
+ g_signal_new ("frame-drop", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
+ G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_drop), NULL, NULL,
+ g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
+ gst_v4lmjpegsrc_signals[SIGNAL_FRAME_INSERT] =
+ g_signal_new ("frame-insert", G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_insert),
+ NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
+ gst_v4lmjpegsrc_signals[SIGNAL_FRAME_LOST] =
+ g_signal_new ("frame-lost", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
+ G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_lost), NULL, NULL,
+ g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
+
+ GST_DEBUG_CATEGORY_INIT (v4lmjpegsrc_debug, "v4lmjpegsrc", 0,
+ "V4L MJPEG source element");
+ gobject_class->set_property = gst_v4lmjpegsrc_set_property;
+ gobject_class->get_property = gst_v4lmjpegsrc_get_property;
+
+ gstelement_class->change_state = gst_v4lmjpegsrc_change_state;
+
+ gstelement_class->set_clock = gst_v4lmjpegsrc_set_clock;
+}
+
+
+static void
+gst_v4lmjpegsrc_init (GstV4lMjpegSrc * v4lmjpegsrc)
+{
+ GstElementClass *klass = GST_ELEMENT_GET_CLASS (v4lmjpegsrc);
+
+ GST_OBJECT_FLAG_SET (GST_ELEMENT (v4lmjpegsrc), GST_ELEMENT_THREAD_SUGGESTED);
+
+ v4lmjpegsrc->srcpad =
+ gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
+ "src"), "src");
+ gst_element_add_pad (GST_ELEMENT (v4lmjpegsrc), v4lmjpegsrc->srcpad);
+
+ gst_pad_set_get_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_get);
+ gst_pad_set_getcaps_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_getcaps);
+ gst_pad_set_link_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_srcconnect);
+ gst_pad_set_convert_function (v4lmjpegsrc->srcpad,
+ gst_v4lmjpegsrc_src_convert);
+ gst_pad_set_formats_function (v4lmjpegsrc->srcpad,
+ gst_v4lmjpegsrc_get_formats);
+ gst_pad_set_query_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_src_query);
+ gst_pad_set_query_type_function (v4lmjpegsrc->srcpad,
+ gst_v4lmjpegsrc_get_query_types);
+
+#if 0
+ v4lmjpegsrc->frame_width = 0;
+ v4lmjpegsrc->frame_height = 0;
+ v4lmjpegsrc->x_offset = -1;
+ v4lmjpegsrc->y_offset = -1;
+#endif
+
+ v4lmjpegsrc->quality = 50;
+
+ v4lmjpegsrc->numbufs = 64;
+
+ /* no clock */
+ v4lmjpegsrc->clock = NULL;
+
+ /* fps */
+ v4lmjpegsrc->use_fixed_fps = TRUE;
+
+ v4lmjpegsrc->is_capturing = FALSE;
+}
+
+
+static gboolean
+gst_v4lmjpegsrc_get_fps (GstV4lMjpegSrc * v4lmjpegsrc, GValue * fps)
+{
+ gint norm;
+
+ g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (fps), FALSE);
+
+ if (!v4lmjpegsrc->use_fixed_fps &&
+ v4lmjpegsrc->clock != NULL && v4lmjpegsrc->handled > 0) {
+ /* try to get time from clock master and calculate fps */
+ GstClockTime time =
+ gst_clock_get_time (v4lmjpegsrc->clock) - v4lmjpegsrc->substract_time;
+ return v4lmjpegsrc->handled * GST_SECOND / time;
+ }
+
+ /* if that failed ... */
+
+ if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc)))
+ return FALSE;
+
+ if (!gst_v4l_get_chan_norm (GST_V4LELEMENT (v4lmjpegsrc), NULL, &norm))
+ return FALSE;
+
+ if (norm == VIDEO_MODE_NTSC)
+ gst_value_set_fraction (fps, 30000, 1001);
+ else
+ gst_value_set_fraction (fps, 25, 1);
+
+ return TRUE;
+}
+
+static gboolean
+gst_v4lmjpegsrc_src_convert (GstPad * pad,
+ GstFormat src_format,
+ gint64 src_value, GstFormat * dest_format, gint64 * dest_value)
+{
+ GstV4lMjpegSrc *v4lmjpegsrc;
+ GValue fps = { 0 };
+ gboolean result = TRUE;
+
+ v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
+
+ g_value_init (&fps, GST_VALUE_FRACTION);
+ if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps))
+ return FALSE;
+
+ switch (src_format) {
+ case GST_FORMAT_TIME:
+ switch (*dest_format) {
+ case GST_FORMAT_DEFAULT:
+ *dest_value = gst_util_uint64_scale (src_value,
+ gst_value_get_fraction_numerator (&fps),
+ gst_value_get_fraction_denominator (&fps) * GST_SECOND);
+ break;
+ default:
+ result = FALSE;
+ }
+ break;
+
+ case GST_FORMAT_DEFAULT:
+ switch (*dest_format) {
+ case GST_FORMAT_TIME:
+ *dest_value = src_value * gst_util_uint64_scale_int (GST_SECOND,
+ gst_value_get_fraction_denominator (&fps),
+ gst_value_get_fraction_numerator (&fps));
+ break;
+ default:
+ result = FALSE;
+ }
+ break;
+
+ default:
+ result = FALSE;
+ }
+
+ g_value_unset (&fps);
+ return result;
+}
+
+static gboolean
+gst_v4lmjpegsrc_src_query (GstPad * pad,
+ GstQueryType type, GstFormat * format, gint64 * value)
+{
+ GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
+ gboolean res = TRUE;
+ GValue fps = { 0 };
+
+ g_value_init (&fps, GST_VALUE_FRACTION);
+ if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps))
+ return FALSE;
+
+ switch (type) {
+ case GST_QUERY_POSITION:
+ switch (*format) {
+ case GST_FORMAT_TIME:
+ *value = v4lmjpegsrc->handled * gst_util_uint64_scale_int (GST_SECOND,
+ gst_value_get_fraction_denominator (&fps),
+ gst_value_get_fraction_numerator (&fps));
+ break;
+ case GST_FORMAT_DEFAULT:
+ *value = v4lmjpegsrc->handled;
+ break;
+ default:
+ res = FALSE;
+ break;
+ }
+ break;
+ default:
+ res = FALSE;
+ break;
+ }
+
+ g_value_unset (&fps);
+ return res;
+}
+
+static inline gulong
+calc_bufsize (int hor_dec, int ver_dec)
+{
+ guint8 div = hor_dec * ver_dec;
+ guint32 num = (1024 * 512) / (div);
+ guint32 result = 2;
+
+ num--;
+ while (num) {
+ num >>= 1;
+ result <<= 1;
+ }
+
+ if (result > (512 * 1024))
+ return (512 * 1024);
+ if (result < 8192)
+ return 8192;
+ return result;
+}
+
+static GstPadLinkReturn
+gst_v4lmjpegsrc_srcconnect (GstPad * pad, const GstCaps * caps)
+{
+ GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
+ gint hor_dec, ver_dec;
+ gint w, h;
+ gint max_w = GST_V4LELEMENT (v4lmjpegsrc)->vcap.maxwidth,
+ max_h = GST_V4LELEMENT (v4lmjpegsrc)->vcap.maxheight;
+ gulong bufsize;
+ GstStructure *structure;
+ gboolean was_capturing;
+
+ /* in case the buffers are active (which means that we already
+ * did capsnego before and didn't clean up), clean up anyways */
+ if ((was_capturing = v4lmjpegsrc->is_capturing)) {
+ if (!gst_v4lmjpegsrc_capture_stop (v4lmjpegsrc))
+ return GST_PAD_LINK_REFUSED;
+ }
+ if (GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc))) {
+ if (!gst_v4lmjpegsrc_capture_deinit (v4lmjpegsrc))
+ return GST_PAD_LINK_REFUSED;
+ } else if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc))) {
+ return GST_PAD_LINK_DELAYED;
+ }
+
+ /* Note: basically, we don't give a damn about the opposite caps here.
+ * that might seem odd, but it isn't. we know that the opposite caps is
+ * either NULL or has mime type image/jpeg, and in both cases, we'll set
+ * our own mime type back and it'll work. Other properties are to be set
+ * by the src, not by the opposite caps */
+
+ structure = gst_caps_get_structure (caps, 0);
+ gst_structure_get_int (structure, "width", &w);
+ gst_structure_get_int (structure, "height", &h);
+
+ /* figure out decimation */
+ if (w >= max_w) {
+ hor_dec = 1;
+ } else if (w * 2 >= max_w) {
+ hor_dec = 2;
+ } else {
+ hor_dec = 4;
+ }
+ if (h >= max_h) {
+ ver_dec = 1;
+ } else if (h * 2 >= max_h) {
+ ver_dec = 2;
+ } else {
+ ver_dec = 4;
+ }
+
+ /* calculate bufsize */
+ bufsize = calc_bufsize (hor_dec, ver_dec);
+
+ /* set buffer info */
+ if (!gst_v4lmjpegsrc_set_buffer (v4lmjpegsrc, v4lmjpegsrc->numbufs, bufsize)) {
+ return GST_PAD_LINK_REFUSED;
+ }
+
+ /* set capture parameters and mmap the buffers */
+ if (hor_dec == ver_dec) {
+ if (!gst_v4lmjpegsrc_set_capture (v4lmjpegsrc,
+ hor_dec, v4lmjpegsrc->quality)) {
+ return GST_PAD_LINK_REFUSED;
+ }
+ } else {
+ if (!gst_v4lmjpegsrc_set_capture_m (v4lmjpegsrc,
+ 0, 0, max_w, max_h, hor_dec, ver_dec, v4lmjpegsrc->quality)) {
+ return GST_PAD_LINK_REFUSED;
+ }
+ }
+#if 0
+ if (!v4lmjpegsrc->frame_width && !v4lmjpegsrc->frame_height &&
+ v4lmjpegsrc->x_offset < 0 && v4lmjpegsrc->y_offset < 0 &&
+ v4lmjpegsrc->horizontal_decimation == v4lmjpegsrc->vertical_decimation) {
+ if (!gst_v4lmjpegsrc_set_capture (v4lmjpegsrc,
+ v4lmjpegsrc->horizontal_decimation, v4lmjpegsrc->quality))
+ return GST_PAD_LINK_REFUSED;
+ } else {
+ if (!gst_v4lmjpegsrc_set_capture_m (v4lmjpegsrc,
+ v4lmjpegsrc->x_offset, v4lmjpegsrc->y_offset,
+ v4lmjpegsrc->frame_width, v4lmjpegsrc->frame_height,
+ v4lmjpegsrc->horizontal_decimation,
+ v4lmjpegsrc->vertical_decimation, v4lmjpegsrc->quality))
+ return GST_PAD_LINK_REFUSED;
+ }
+#endif
+
+ if (!gst_v4lmjpegsrc_capture_init (v4lmjpegsrc))
+ return GST_PAD_LINK_REFUSED;
+
+ if (was_capturing || GST_STATE (v4lmjpegsrc) == GST_STATE_PLAYING)
+ if (!gst_v4lmjpegsrc_capture_start (v4lmjpegsrc))
+ return GST_PAD_LINK_REFUSED;
+
+ return GST_PAD_LINK_OK;
+}
+
+
+static GstData *
+gst_v4lmjpegsrc_get (GstPad * pad)
+{
+ GstV4lMjpegSrc *v4lmjpegsrc;
+ GstBuffer *buf;
+ gint num;
+ GValue fps = { 0 };
+ GstClockTime duration;
+ GstClockTime cur_frame_time;
+
+ g_return_val_if_fail (pad != NULL, NULL);
+
+ v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
+
+ if (v4lmjpegsrc->use_fixed_fps) {
+ g_value_init (&fps, GST_VALUE_FRACTION);
+ duration = gst_util_uint64_scale_int (GST_SECOND,
+ gst_value_get_fraction_denominator (&fps),
+ gst_value_get_fraction_numerator (&fps));
+ cur_frame_time =
+ gst_util_uint64_scale_int (v4lmjpegsrc->handled * GST_SECOND,
+ gst_value_get_fraction_denominator (&fps),
+ gst_value_get_fraction_numerator (&fps));
+
+
+ if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps)) {
+ g_value_unset (&fps);
+ return NULL;
+ }
+ }
+
+ if (v4lmjpegsrc->need_writes > 0) {
+ /* use last frame */
+ num = v4lmjpegsrc->last_frame;
+ v4lmjpegsrc->need_writes--;
+ } else if (v4lmjpegsrc->clock && v4lmjpegsrc->use_fixed_fps) {
+ GstClockTime time;
+ gboolean have_frame = FALSE;
+
+ do {
+ /* by default, we use the frame once */
+ v4lmjpegsrc->need_writes = 1;
+
+ /* grab a frame from the device */
+ if (!gst_v4lmjpegsrc_grab_frame (v4lmjpegsrc, &num,
+ &v4lmjpegsrc->last_size))
+ return NULL;
+
+ v4lmjpegsrc->last_frame = num;
+ time = GST_TIMEVAL_TO_TIME (v4lmjpegsrc->bsync.timestamp) -
+ v4lmjpegsrc->substract_time;
+
+ /* first check whether we lost any frames according to the device */
+ if (v4lmjpegsrc->last_seq != 0) {
+ if (v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq > 1) {
+ v4lmjpegsrc->need_writes =
+ v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq;
+ g_signal_emit (G_OBJECT (v4lmjpegsrc),
+ gst_v4lmjpegsrc_signals[SIGNAL_FRAME_LOST], 0,
+ v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq - 1);
+ }
+ }
+ v4lmjpegsrc->last_seq = v4lmjpegsrc->bsync.seq;
+
+ /* decide how often we're going to write the frame - set
+ * v4lmjpegsrc->need_writes to (that-1) and have_frame to TRUE
+ * if we're going to write it - else, just continue.
+ *
+ * time is generally the system or audio clock. Let's
+ * say that we've written one second of audio, then we want
+ * to have written one second of video too, within the same
+ * timeframe. This means that if time - begin_time = X sec,
+ * we want to have written X*fps frames. If we've written
+ * more - drop, if we've written less - dup... */
+ if (cur_frame_time - time > 1.5 * duration) {
+ /* yo dude, we've got too many frames here! Drop! DROP! */
+ v4lmjpegsrc->need_writes--; /* -= (v4lmjpegsrc->handled - (time / fps)); */
+ g_signal_emit (G_OBJECT (v4lmjpegsrc),
+ gst_v4lmjpegsrc_signals[SIGNAL_FRAME_DROP], 0);
+ } else if (cur_frame_time - time < -1.5 * duration) {
+ /* this means we're lagging far behind */
+ v4lmjpegsrc->need_writes++; /* += ((time / fps) - v4lmjpegsrc->handled); */
+ g_signal_emit (G_OBJECT (v4lmjpegsrc),
+ gst_v4lmjpegsrc_signals[SIGNAL_FRAME_INSERT], 0);
+ }
+
+ if (v4lmjpegsrc->need_writes > 0) {
+ have_frame = TRUE;
+ v4lmjpegsrc->use_num_times[num] = v4lmjpegsrc->need_writes;
+ v4lmjpegsrc->need_writes--;
+ } else {
+ gst_v4lmjpegsrc_requeue_frame (v4lmjpegsrc, num);
+ }
+ } while (!have_frame);
+ } else {
+ /* grab a frame from the device */
+ if (!gst_v4lmjpegsrc_grab_frame (v4lmjpegsrc, &num,
+ &v4lmjpegsrc->last_size))
+ return NULL;
+
+ v4lmjpegsrc->use_num_times[num] = 1;
+ }
+
+ buf = gst_buffer_new ();
+ GST_BUFFER_FREE_DATA_FUNC (buf) = gst_v4lmjpegsrc_buffer_free;
+ GST_BUFFER_PRIVATE (buf) = v4lmjpegsrc;
+ GST_BUFFER_DATA (buf) = gst_v4lmjpegsrc_get_buffer (v4lmjpegsrc, num);
+ GST_BUFFER_SIZE (buf) = v4lmjpegsrc->last_size;
+ GST_BUFFER_MAXSIZE (buf) = v4lmjpegsrc->breq.size;
+ GST_BUFFER_FLAG_SET (buf, GST_BUFFER_READONLY);
+ GST_BUFFER_FLAG_SET (buf, GST_BUFFER_DONTFREE);
+ if (v4lmjpegsrc->use_fixed_fps)
+ GST_BUFFER_TIMESTAMP (buf) = cur_frame_time;
+ else /* calculate time based on our own clock */
+ GST_BUFFER_TIMESTAMP (buf) =
+ GST_TIMEVAL_TO_TIME (v4lmjpegsrc->bsync.timestamp) -
+ v4lmjpegsrc->substract_time;
+
+ v4lmjpegsrc->handled++;
+ g_signal_emit (G_OBJECT (v4lmjpegsrc),
+ gst_v4lmjpegsrc_signals[SIGNAL_FRAME_CAPTURE], 0);
+
+ return GST_DATA (buf);
+}
+
+
+static GstCaps *
+gst_v4lmjpegsrc_getcaps (GstPad * pad)
+{
+ GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
+ struct video_capability *vcap = &GST_V4LELEMENT (v4lmjpegsrc)->vcap;
+ GstCaps *caps;
+ GstStructure *str;
+ gint i;
+ GValue w = { 0 }, h = {
+ 0}, w1 = {
+ 0}, h1 = {
+ 0}, fps = {
+ 0};
+
+ if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc))) {
+ return gst_caps_copy (gst_pad_get_pad_template_caps (pad));
+ }
+
+ g_value_init (&fps, GST_TYPE_FRACTION);
+ gst_return_val_if_fail (gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps), NULL);
+
+ caps = gst_caps_new_simple ("image/jpeg", NULL);
+ str = gst_caps_get_structure (caps, 0);
+ gst_structure_set_value (str, "framerate", &fps);
+ g_value_unset (&fps);
+
+ g_value_init (&w, GST_TYPE_LIST);
+ g_value_init (&h, GST_TYPE_LIST);
+ g_value_init (&w1, G_TYPE_INT);
+ g_value_init (&h1, G_TYPE_INT);
+ for (i = 0; i <= 2; i++) {
+ g_value_set_int (&w1, vcap->maxwidth / (1 << i));
+ g_value_set_int (&h1, vcap->maxheight / (1 << i));
+ gst_value_list_append_value (&w, &w1);
+ gst_value_list_append_value (&h, &h1);
+ }
+ g_value_unset (&h1);
+ g_value_unset (&w1);
+ gst_structure_set_value (str, "width", &w);
+ gst_structure_set_value (str, "height", &h);
+ g_value_unset (&w);
+ g_value_unset (&h);
+
+ return caps;
+}
+
+
+static void
+gst_v4lmjpegsrc_set_property (GObject * object,
+ guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+ GstV4lMjpegSrc *v4lmjpegsrc;
+
+ g_return_if_fail (GST_IS_V4LMJPEGSRC (object));
+ v4lmjpegsrc = GST_V4LMJPEGSRC (object);
+
+ switch (prop_id) {
+#if 0
+ case ARG_X_OFFSET:
+ v4lmjpegsrc->x_offset = g_value_get_int (value);
+ break;
+ case ARG_Y_OFFSET:
+ v4lmjpegsrc->y_offset = g_value_get_int (value);
+ break;
+ case ARG_F_WIDTH:
+ v4lmjpegsrc->frame_width = g_value_get_int (value);
+ break;
+ case ARG_F_HEIGHT:
+ v4lmjpegsrc->frame_height = g_value_get_int (value);
+ break;
+#endif
+ case ARG_QUALITY:
+ v4lmjpegsrc->quality = g_value_get_int (value);
+ break;
+ case ARG_NUMBUFS:
+ v4lmjpegsrc->numbufs = g_value_get_int (value);
+ break;
+ case ARG_USE_FIXED_FPS:
+ if (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc))) {
+ v4lmjpegsrc->use_fixed_fps = g_value_get_boolean (value);
+ }
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+
+static void
+gst_v4lmjpegsrc_get_property (GObject * object,
+ guint prop_id, GValue * value, GParamSpec * pspec)
+{
+ GstV4lMjpegSrc *v4lmjpegsrc;
+
+ g_return_if_fail (GST_IS_V4LMJPEGSRC (object));
+ v4lmjpegsrc = GST_V4LMJPEGSRC (object);
+
+ switch (prop_id) {
+#if 0
+ case ARG_X_OFFSET:
+ g_value_set_int (value, v4lmjpegsrc->x_offset);
+ break;
+ case ARG_Y_OFFSET:
+ g_value_set_int (value, v4lmjpegsrc->y_offset);
+ break;
+ case ARG_F_WIDTH:
+ g_value_set_int (value, v4lmjpegsrc->frame_width);
+ break;
+ case ARG_F_HEIGHT:
+ g_value_set_int (value, v4lmjpegsrc->frame_height);
+ break;
+#endif
+ case ARG_QUALITY:
+ g_value_set_int (value, v4lmjpegsrc->quality);
+ break;
+ case ARG_NUMBUFS:
+ if (GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc)))
+ g_value_set_int (value, v4lmjpegsrc->breq.count);
+ else
+ g_value_set_int (value, v4lmjpegsrc->numbufs);
+ break;
+ case ARG_BUFSIZE:
+ g_value_set_int (value, v4lmjpegsrc->breq.size);
+ break;
+ case ARG_USE_FIXED_FPS:
+ g_value_set_boolean (value, v4lmjpegsrc->use_fixed_fps);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+
+static GstStateChangeReturn
+gst_v4lmjpegsrc_change_state (GstElement * element, GstStateChange transition)
+{
+ GstV4lMjpegSrc *v4lmjpegsrc;
+ GTimeVal time;
+
+ g_return_val_if_fail (GST_IS_V4LMJPEGSRC (element), GST_STATE_CHANGE_FAILURE);
+
+ v4lmjpegsrc = GST_V4LMJPEGSRC (element);
+
+ switch (transition) {
+ case GST_STATE_CHANGE_READY_TO_PAUSED:
+ /* actual buffer set-up used to be done here - but I moved
+ * it to capsnego itself */
+ v4lmjpegsrc->handled = 0;
+ v4lmjpegsrc->need_writes = 0;
+ v4lmjpegsrc->last_frame = 0;
+ v4lmjpegsrc->substract_time = 0;
+ break;
+ case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
+ /* queue all buffer, start streaming capture */
+ if (GST_V4LELEMENT (v4lmjpegsrc)->buffer &&
+ !gst_v4lmjpegsrc_capture_start (v4lmjpegsrc))
+ return GST_STATE_CHANGE_FAILURE;
+ g_get_current_time (&time);
+ v4lmjpegsrc->substract_time = GST_TIMEVAL_TO_TIME (time) -
+ v4lmjpegsrc->substract_time;
+ v4lmjpegsrc->last_seq = 0;
+ break;
+ case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
+ g_get_current_time (&time);
+ v4lmjpegsrc->substract_time = GST_TIMEVAL_TO_TIME (time) -
+ v4lmjpegsrc->substract_time;
+ /* de-queue all queued buffers */
+ if (v4lmjpegsrc->is_capturing &&
+ !gst_v4lmjpegsrc_capture_stop (v4lmjpegsrc))
+ return GST_STATE_CHANGE_FAILURE;
+ break;
+ case GST_STATE_CHANGE_PAUSED_TO_READY:
+ /* stop capturing, unmap all buffers */
+ if (GST_V4LELEMENT (v4lmjpegsrc)->buffer &&
+ !gst_v4lmjpegsrc_capture_deinit (v4lmjpegsrc))
+ return GST_STATE_CHANGE_FAILURE;
+ break;
+ }
+
+ if (GST_ELEMENT_CLASS (parent_class)->change_state)
+ return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+
+ return GST_STATE_CHANGE_SUCCESS;
+}
+
+
+static void
+gst_v4lmjpegsrc_set_clock (GstElement * element, GstClock * clock)
+{
+ GST_V4LMJPEGSRC (element)->clock = clock;
+}
+
+
+#if 0
+static GstBuffer *
+gst_v4lmjpegsrc_buffer_new (GstBufferPool * pool,
+ guint64 offset, guint size, gpointer user_data)
+{
+ GstBuffer *buffer;
+ GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (user_data);
+
+ if (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc)))
+ return NULL;
+
+ buffer = gst_buffer_new ();
+ if (!buffer)
+ return NULL;
+
+ /* TODO: add interlacing info to buffer as metadata */
+ GST_BUFFER_MAXSIZE (buffer) = v4lmjpegsrc->breq.size;
+ GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_DONTFREE);
+
+ return buffer;
+}
+#endif
+
+static void
+gst_v4lmjpegsrc_buffer_free (GstBuffer * buf)
+{
+ GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (GST_BUFFER_PRIVATE (buf));
+ int n;
+
+ if (gst_element_get_state (GST_ELEMENT (v4lmjpegsrc)) != GST_STATE_PLAYING)
+ return; /* we've already cleaned up ourselves */
+
+ for (n = 0; n < v4lmjpegsrc->breq.count; n++)
+ if (GST_BUFFER_DATA (buf) == gst_v4lmjpegsrc_get_buffer (v4lmjpegsrc, n)) {
+ v4lmjpegsrc->use_num_times[n]--;
+ if (v4lmjpegsrc->use_num_times[n] <= 0) {
+ gst_v4lmjpegsrc_requeue_frame (v4lmjpegsrc, n);
+ }
+ break;
+ }
+
+ if (n == v4lmjpegsrc->breq.count)
+ GST_ELEMENT_ERROR (v4lmjpegsrc, RESOURCE, TOO_LAZY, (NULL),
+ ("Couldn't find the buffer"));
+}
projects / mafwsubrenderer / blobdiff