--- /dev/null
+/* GStreamer
+ *
+ * gstv4lsrc.c: BT8x8/V4L source element
+ *
+ * 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 <sys/time.h>
+#include "v4lsrc_calls.h"
+#include <sys/ioctl.h>
+
+
+GST_DEBUG_CATEGORY_STATIC (v4lsrc_debug);
+#define GST_CAT_DEFAULT v4lsrc_debug
+
+
+enum
+{
+ PROP_0,
+ PROP_AUTOPROBE,
+ PROP_AUTOPROBE_FPS,
+ PROP_COPY_MODE,
+ PROP_TIMESTAMP_OFFSET
+};
+
+
+GST_BOILERPLATE (GstV4lSrc, gst_v4lsrc, GstV4lElement, GST_TYPE_V4LELEMENT);
+
+static GstStaticPadTemplate v4l_src_template = GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("ANY")
+ );
+
+/* basesrc methods */
+static gboolean gst_v4lsrc_start (GstBaseSrc * src);
+static gboolean gst_v4lsrc_stop (GstBaseSrc * src);
+static gboolean gst_v4lsrc_set_caps (GstBaseSrc * src, GstCaps * caps);
+static GstCaps *gst_v4lsrc_get_caps (GstBaseSrc * src);
+static GstFlowReturn gst_v4lsrc_create (GstPushSrc * src, GstBuffer ** out);
+static gboolean gst_v4lsrc_query (GstBaseSrc * bsrc, GstQuery * query);
+static void gst_v4lsrc_fixate (GstBaseSrc * bsrc, GstCaps * caps);
+
+static void gst_v4lsrc_set_property (GObject * object,
+ guint prop_id, const GValue * value, GParamSpec * pspec);
+static void gst_v4lsrc_get_property (GObject * object,
+ guint prop_id, GValue * value, GParamSpec * pspec);
+
+
+static void
+gst_v4lsrc_base_init (gpointer g_class)
+{
+ GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
+
+ gst_element_class_set_details_simple (gstelement_class,
+ "Video (video4linux/raw) Source", "Source/Video",
+ "Reads raw frames from a video4linux device",
+ "GStreamer maintainers <gstreamer-devel@lists.sourceforge.net>");
+
+ gst_element_class_add_pad_template (gstelement_class,
+ gst_static_pad_template_get (&v4l_src_template));
+}
+
+static void
+gst_v4lsrc_class_init (GstV4lSrcClass * klass)
+{
+ GObjectClass *gobject_class;
+ GstBaseSrcClass *basesrc_class;
+ GstPushSrcClass *pushsrc_class;
+
+ gobject_class = (GObjectClass *) klass;
+ basesrc_class = (GstBaseSrcClass *) klass;
+ pushsrc_class = (GstPushSrcClass *) klass;
+
+ gobject_class->set_property = gst_v4lsrc_set_property;
+ gobject_class->get_property = gst_v4lsrc_get_property;
+
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_AUTOPROBE,
+ g_param_spec_boolean ("autoprobe", "Autoprobe",
+ "Whether the device should be probed for all possible features",
+ TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_AUTOPROBE_FPS,
+ g_param_spec_boolean ("autoprobe-fps", "Autoprobe FPS",
+ "Whether the device should be probed for framerates",
+ TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_COPY_MODE,
+ g_param_spec_boolean ("copy-mode", "Copy mode",
+ "Whether to send out copies of buffers, or direct pointers to the mmap region",
+ TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass),
+ PROP_TIMESTAMP_OFFSET, g_param_spec_int64 ("timestamp-offset",
+ "Timestamp offset",
+ "A time offset subtracted from timestamps set on buffers (in ns)",
+ G_MININT64, G_MAXINT64, 0,
+ G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+ GST_DEBUG_CATEGORY_INIT (v4lsrc_debug, "v4lsrc", 0, "V4L source element");
+
+ basesrc_class->get_caps = gst_v4lsrc_get_caps;
+ basesrc_class->set_caps = gst_v4lsrc_set_caps;
+ basesrc_class->start = gst_v4lsrc_start;
+ basesrc_class->stop = gst_v4lsrc_stop;
+ basesrc_class->fixate = gst_v4lsrc_fixate;
+ basesrc_class->query = gst_v4lsrc_query;
+
+ pushsrc_class->create = gst_v4lsrc_create;
+}
+
+static void
+gst_v4lsrc_init (GstV4lSrc * v4lsrc, GstV4lSrcClass * klass)
+{
+ v4lsrc->buffer_size = 0;
+
+ /* no colorspaces */
+ v4lsrc->colorspaces = NULL;
+
+ v4lsrc->is_capturing = FALSE;
+ v4lsrc->autoprobe = TRUE;
+ v4lsrc->autoprobe_fps = TRUE;
+ v4lsrc->copy_mode = TRUE;
+
+ v4lsrc->timestamp_offset = 0;
+
+ v4lsrc->fps_list = NULL;
+
+ gst_base_src_set_format (GST_BASE_SRC (v4lsrc), GST_FORMAT_TIME);
+ gst_base_src_set_live (GST_BASE_SRC (v4lsrc), TRUE);
+}
+
+static void
+gst_v4lsrc_set_property (GObject * object,
+ guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+ GstV4lSrc *v4lsrc = GST_V4LSRC (object);
+
+ switch (prop_id) {
+ case PROP_AUTOPROBE:
+ g_return_if_fail (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lsrc)));
+ v4lsrc->autoprobe = g_value_get_boolean (value);
+ break;
+ case PROP_AUTOPROBE_FPS:
+ g_return_if_fail (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lsrc)));
+ v4lsrc->autoprobe_fps = g_value_get_boolean (value);
+ break;
+ case PROP_COPY_MODE:
+ v4lsrc->copy_mode = g_value_get_boolean (value);
+ break;
+ case PROP_TIMESTAMP_OFFSET:
+ v4lsrc->timestamp_offset = g_value_get_int64 (value);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+
+static void
+gst_v4lsrc_get_property (GObject * object,
+ guint prop_id, GValue * value, GParamSpec * pspec)
+{
+ GstV4lSrc *v4lsrc = GST_V4LSRC (object);
+
+ switch (prop_id) {
+ case PROP_AUTOPROBE:
+ g_value_set_boolean (value, v4lsrc->autoprobe);
+ break;
+ case PROP_AUTOPROBE_FPS:
+ g_value_set_boolean (value, v4lsrc->autoprobe_fps);
+ break;
+ case PROP_COPY_MODE:
+ g_value_set_boolean (value, v4lsrc->copy_mode);
+ break;
+ case PROP_TIMESTAMP_OFFSET:
+ g_value_set_int64 (value, v4lsrc->timestamp_offset);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+/* this function is a bit of a last resort */
+static void
+gst_v4lsrc_fixate (GstBaseSrc * bsrc, GstCaps * caps)
+{
+ GstStructure *structure;
+ int i;
+ int targetwidth, targetheight;
+ GstV4lSrc *v4lsrc = GST_V4LSRC (bsrc);
+ struct video_capability *vcap = &GST_V4LELEMENT (v4lsrc)->vcap;
+ struct video_window *vwin = &GST_V4LELEMENT (v4lsrc)->vwin;
+
+ if (GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lsrc))) {
+ GST_DEBUG_OBJECT (v4lsrc, "device reported w: %d-%d, h: %d-%d",
+ vcap->minwidth, vcap->maxwidth, vcap->minheight, vcap->maxheight);
+ targetwidth = vcap->minwidth;
+ targetheight = vcap->minheight;
+ /* if we can get the current vwin settings, we use those to fixate */
+ if (!gst_v4l_get_capabilities (GST_V4LELEMENT (v4lsrc)))
+ GST_DEBUG_OBJECT (v4lsrc, "failed getting capabilities");
+ else {
+ targetwidth = vwin->width;
+ targetheight = vwin->height;
+ }
+ } else {
+ GST_DEBUG_OBJECT (v4lsrc, "device closed, guessing");
+ targetwidth = 320;
+ targetheight = 200;
+ }
+
+ GST_DEBUG_OBJECT (v4lsrc, "targetting %dx%d", targetwidth, targetheight);
+
+ for (i = 0; i < gst_caps_get_size (caps); ++i) {
+ const GValue *v;
+
+ structure = gst_caps_get_structure (caps, i);
+ gst_structure_fixate_field_nearest_int (structure, "width", targetwidth);
+ gst_structure_fixate_field_nearest_int (structure, "height", targetheight);
+ gst_structure_fixate_field_nearest_fraction (structure, "framerate", 15, 2);
+
+ v = gst_structure_get_value (structure, "format");
+ if (v && G_VALUE_TYPE (v) != GST_TYPE_FOURCC) {
+ guint32 fourcc;
+
+ g_return_if_fail (G_VALUE_TYPE (v) == GST_TYPE_LIST);
+
+ fourcc = gst_value_get_fourcc (gst_value_list_get_value (v, 0));
+ gst_structure_set (structure, "format", GST_TYPE_FOURCC, fourcc, NULL);
+ }
+ }
+}
+
+static gint all_palettes[] = {
+ VIDEO_PALETTE_YUV422,
+ VIDEO_PALETTE_YUV420P,
+ VIDEO_PALETTE_UYVY,
+ VIDEO_PALETTE_YUV411P,
+ VIDEO_PALETTE_YUV422P,
+ VIDEO_PALETTE_YUV410P,
+ VIDEO_PALETTE_YUV411,
+ VIDEO_PALETTE_RGB555,
+ VIDEO_PALETTE_RGB565,
+ VIDEO_PALETTE_RGB24,
+ VIDEO_PALETTE_RGB32,
+ -1
+};
+
+static GstCaps *
+gst_v4lsrc_palette_to_caps (int palette)
+{
+ guint32 fourcc;
+ GstCaps *caps;
+
+ switch (palette) {
+ case VIDEO_PALETTE_YUV422:
+ case VIDEO_PALETTE_YUYV:
+ fourcc = GST_MAKE_FOURCC ('Y', 'U', 'Y', '2');
+ break;
+ case VIDEO_PALETTE_YUV420P:
+ fourcc = GST_MAKE_FOURCC ('I', '4', '2', '0');
+ break;
+ case VIDEO_PALETTE_UYVY:
+ fourcc = GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y');
+ break;
+ case VIDEO_PALETTE_YUV411P:
+ fourcc = GST_MAKE_FOURCC ('Y', '4', '1', 'B');
+ break;
+ case VIDEO_PALETTE_YUV411:
+ fourcc = GST_MAKE_FOURCC ('Y', '4', '1', 'P');
+ break;
+ case VIDEO_PALETTE_YUV422P:
+ fourcc = GST_MAKE_FOURCC ('Y', '4', '2', 'B');
+ break;
+ case VIDEO_PALETTE_YUV410P:
+ fourcc = GST_MAKE_FOURCC ('Y', 'U', 'V', '9');
+ break;
+ case VIDEO_PALETTE_RGB555:
+ case VIDEO_PALETTE_RGB565:
+ case VIDEO_PALETTE_RGB24:
+ case VIDEO_PALETTE_RGB32:
+ fourcc = GST_MAKE_FOURCC ('R', 'G', 'B', ' ');
+ break;
+ default:
+ return NULL;
+ }
+
+ if (fourcc == GST_MAKE_FOURCC ('R', 'G', 'B', ' ')) {
+ switch (palette) {
+ case VIDEO_PALETTE_RGB555:
+ caps = gst_caps_from_string ("video/x-raw-rgb, "
+ "bpp = (int) 16, "
+ "depth = (int) 15, "
+ "endianness = (int) BYTE_ORDER, "
+ "red_mask = 0x7c00, " "green_mask = 0x03e0, " "blue_mask = 0x001f");
+ break;
+ case VIDEO_PALETTE_RGB565:
+ caps = gst_caps_from_string ("video/x-raw-rgb, "
+ "bpp = (int) 16, "
+ "depth = (int) 16, "
+ "endianness = (int) BYTE_ORDER, "
+ "red_mask = 0xf800, " "green_mask = 0x07f0, " "blue_mask = 0x001f");
+ break;
+ case VIDEO_PALETTE_RGB24:
+ caps = gst_caps_from_string ("video/x-raw-rgb, "
+ "bpp = (int) 24, "
+ "depth = (int) 24, "
+ "endianness = (int) BIG_ENDIAN, "
+ "red_mask = 0xFF0000, "
+ "green_mask = 0x00FF00, " "blue_mask = 0x0000FF");
+ break;
+ case VIDEO_PALETTE_RGB32:
+ caps = gst_caps_from_string ("video/x-raw-rgb, "
+ "bpp = (int) 32, "
+ "depth = (int) 24, "
+ "endianness = (int) BIG_ENDIAN, "
+ "red_mask = 0xFF000000, "
+ "green_mask = 0x00FF0000, " "blue_mask = 0x0000FF00");
+ break;
+ default:
+ g_assert_not_reached ();
+ return NULL;
+ }
+ } else {
+ caps = gst_caps_new_simple ("video/x-raw-yuv",
+ "format", GST_TYPE_FOURCC, fourcc, NULL);
+ }
+
+ return caps;
+}
+
+static GstCaps *
+gst_v4lsrc_get_any_caps (void)
+{
+ gint i;
+ GstCaps *caps = gst_caps_new_empty (), *one;
+
+ for (i = 0; all_palettes[i] != -1; i++) {
+ one = gst_v4lsrc_palette_to_caps (all_palettes[i]);
+ gst_caps_append (caps, one);
+ }
+
+ return caps;
+}
+
+static GstCaps *
+gst_v4lsrc_get_caps (GstBaseSrc * src)
+{
+ GstCaps *list;
+ GstV4lSrc *v4lsrc = GST_V4LSRC (src);
+ struct video_capability *vcap = &GST_V4LELEMENT (v4lsrc)->vcap;
+ gint width = GST_V4LELEMENT (src)->vcap.minwidth;
+ gint height = GST_V4LELEMENT (src)->vcap.minheight;
+ gint i;
+ gint fps_n, fps_d;
+ GList *item;
+
+ if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lsrc))) {
+ return gst_v4lsrc_get_any_caps ();
+ }
+
+ if (!v4lsrc->autoprobe) {
+ /* FIXME: query current caps and return those, with _any appended */
+ return gst_v4lsrc_get_any_caps ();
+ }
+
+ if (!v4lsrc->colorspaces) {
+ GST_DEBUG_OBJECT (v4lsrc, "Checking supported palettes");
+ for (i = 0; all_palettes[i] != -1; i++) {
+ /* try palette out */
+ if (!gst_v4lsrc_try_capture (v4lsrc, width, height, all_palettes[i]))
+ continue;
+ GST_DEBUG_OBJECT (v4lsrc, "Added palette %d (%s) to supported list",
+ all_palettes[i], gst_v4lsrc_palette_name (all_palettes[i]));
+ v4lsrc->colorspaces = g_list_append (v4lsrc->colorspaces,
+ GINT_TO_POINTER (all_palettes[i]));
+ }
+ GST_DEBUG_OBJECT (v4lsrc, "%d palette(s) supported",
+ g_list_length (v4lsrc->colorspaces));
+ if (v4lsrc->autoprobe_fps) {
+ GST_DEBUG_OBJECT (v4lsrc, "autoprobing framerates");
+ v4lsrc->fps_list = gst_v4lsrc_get_fps_list (v4lsrc);
+ }
+ }
+
+
+ if (!gst_v4lsrc_get_fps (v4lsrc, &fps_n, &fps_d)) {
+ fps_n = 0;
+ fps_d = 1;
+ }
+
+ list = gst_caps_new_empty ();
+ for (item = v4lsrc->colorspaces; item != NULL; item = item->next) {
+ GstCaps *one;
+
+ one = gst_v4lsrc_palette_to_caps (GPOINTER_TO_INT (item->data));
+ if (!one) {
+ GST_WARNING_OBJECT (v4lsrc, "Palette %d gave no caps\n",
+ GPOINTER_TO_INT (item->data));
+ continue;
+ }
+
+ GST_DEBUG_OBJECT (v4lsrc,
+ "Device reports w: %d-%d, h: %d-%d, fps: %d/%d for palette %d",
+ vcap->minwidth, vcap->maxwidth, vcap->minheight, vcap->maxheight,
+ fps_n, fps_d, GPOINTER_TO_INT (item->data));
+
+ if (vcap->minwidth < vcap->maxwidth) {
+ gst_caps_set_simple (one, "width", GST_TYPE_INT_RANGE, vcap->minwidth,
+ vcap->maxwidth, NULL);
+ } else {
+ gst_caps_set_simple (one, "width", G_TYPE_INT, vcap->minwidth, NULL);
+ }
+ if (vcap->minheight < vcap->maxheight) {
+ gst_caps_set_simple (one, "height", GST_TYPE_INT_RANGE, vcap->minheight,
+ vcap->maxheight, NULL);
+ } else {
+ gst_caps_set_simple (one, "height", G_TYPE_INT, vcap->minheight, NULL);
+ }
+
+ if (v4lsrc->autoprobe_fps) {
+ GstStructure *structure = gst_caps_get_structure (one, 0);
+
+ if (v4lsrc->fps_list) {
+ gst_structure_set_value (structure, "framerate", v4lsrc->fps_list);
+ } else {
+ gst_structure_set (structure, "framerate", GST_TYPE_FRACTION,
+ fps_n, fps_d, NULL);
+ }
+ } else {
+ gst_caps_set_simple (one, "framerate", GST_TYPE_FRACTION_RANGE,
+ 1, 1, 100, 1, NULL);
+ }
+
+ GST_DEBUG_OBJECT (v4lsrc, "caps: %" GST_PTR_FORMAT, one);
+ gst_caps_append (list, one);
+ }
+
+ return list;
+}
+
+static gboolean
+gst_v4lsrc_set_caps (GstBaseSrc * src, GstCaps * caps)
+{
+ GstV4lSrc *v4lsrc;
+ guint32 fourcc;
+ gint bpp, depth, w, h, palette = -1;
+ const GValue *new_fps;
+ gint cur_fps_n, cur_fps_d;
+ GstStructure *structure;
+ struct video_window *vwin;
+
+ v4lsrc = GST_V4LSRC (src);
+ vwin = &GST_V4LELEMENT (v4lsrc)->vwin;
+
+ /* if we're not open, punt -- we'll get setcaps'd later via negotiate */
+ if (!GST_V4L_IS_OPEN (v4lsrc))
+ return FALSE;
+
+ /* make sure we stop capturing and dealloc buffers */
+ if (GST_V4L_IS_ACTIVE (v4lsrc)) {
+ if (!gst_v4lsrc_capture_stop (v4lsrc))
+ return FALSE;
+ if (!gst_v4lsrc_capture_deinit (v4lsrc))
+ return FALSE;
+ }
+
+ /* it's fixed, one struct */
+ structure = gst_caps_get_structure (caps, 0);
+
+ if (strcmp (gst_structure_get_name (structure), "video/x-raw-yuv") == 0)
+ gst_structure_get_fourcc (structure, "format", &fourcc);
+ else
+ fourcc = GST_MAKE_FOURCC ('R', 'G', 'B', ' ');
+
+ gst_structure_get_int (structure, "width", &w);
+ gst_structure_get_int (structure, "height", &h);
+ new_fps = gst_structure_get_value (structure, "framerate");
+
+ /* set framerate if it's not already correct */
+ if (!gst_v4lsrc_get_fps (v4lsrc, &cur_fps_n, &cur_fps_d))
+ return FALSE;
+
+ if (new_fps) {
+ GST_DEBUG_OBJECT (v4lsrc, "linking with %dx%d at %d/%d fps", w, h,
+ gst_value_get_fraction_numerator (new_fps),
+ gst_value_get_fraction_denominator (new_fps));
+
+ if (gst_value_get_fraction_numerator (new_fps) != cur_fps_n ||
+ gst_value_get_fraction_denominator (new_fps) != cur_fps_d) {
+ int fps_index = (gst_value_get_fraction_numerator (new_fps) * 16) /
+ (gst_value_get_fraction_denominator (new_fps) * 15);
+
+ GST_DEBUG_OBJECT (v4lsrc, "Trying to set fps index %d", fps_index);
+ /* set bits 16 to 21 to 0 */
+ vwin->flags &= (0x3F00 - 1);
+ /* set bits 16 to 21 to the index */
+ vwin->flags |= fps_index << 16;
+ if (!gst_v4l_set_window_properties (GST_V4LELEMENT (v4lsrc))) {
+ return FALSE;
+ }
+ }
+ }
+
+ switch (fourcc) {
+ case GST_MAKE_FOURCC ('I', '4', '2', '0'):
+ palette = VIDEO_PALETTE_YUV420P;
+ v4lsrc->buffer_size = ((w + 1) & ~1) * ((h + 1) & ~1) * 1.5;
+ break;
+ case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'):
+ palette = VIDEO_PALETTE_YUV422;
+ v4lsrc->buffer_size = ((w + 1) & ~1) * h * 2;
+ break;
+ case GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y'):
+ palette = VIDEO_PALETTE_UYVY;
+ v4lsrc->buffer_size = ((w + 1) & ~1) * h * 2;
+ break;
+ case GST_MAKE_FOURCC ('Y', '4', '1', 'B'):
+ palette = VIDEO_PALETTE_YUV411P;
+ v4lsrc->buffer_size = ((w + 3) & ~3) * h * 1.5;
+ break;
+ case GST_MAKE_FOURCC ('Y', '4', '1', 'P'):
+ palette = VIDEO_PALETTE_YUV411;
+ v4lsrc->buffer_size = ((w + 3) & ~3) * h * 1.5;
+ break;
+ case GST_MAKE_FOURCC ('Y', 'U', 'V', '9'):
+ palette = VIDEO_PALETTE_YUV410P;
+ v4lsrc->buffer_size = ((w + 3) & ~3) * ((h + 3) & ~3) * 1.125;
+ break;
+ case GST_MAKE_FOURCC ('Y', '4', '2', 'B'):
+ palette = VIDEO_PALETTE_YUV422P;
+ v4lsrc->buffer_size = ((w + 1) & ~1) * h * 2;
+ break;
+ case GST_MAKE_FOURCC ('R', 'G', 'B', ' '):
+ gst_structure_get_int (structure, "depth", &depth);
+ switch (depth) {
+ case 15:
+ palette = VIDEO_PALETTE_RGB555;
+ v4lsrc->buffer_size = w * h * 2;
+ break;
+ case 16:
+ palette = VIDEO_PALETTE_RGB565;
+ v4lsrc->buffer_size = w * h * 2;
+ break;
+ case 24:
+ gst_structure_get_int (structure, "bpp", &bpp);
+ switch (bpp) {
+ case 24:
+ palette = VIDEO_PALETTE_RGB24;
+ v4lsrc->buffer_size = w * h * 3;
+ break;
+ case 32:
+ palette = VIDEO_PALETTE_RGB32;
+ v4lsrc->buffer_size = w * h * 4;
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (palette == -1) {
+ GST_WARNING_OBJECT (v4lsrc, "palette for fourcc %" GST_FOURCC_FORMAT
+ " is -1, refusing link", GST_FOURCC_ARGS (fourcc));
+ return FALSE;
+ }
+
+ GST_DEBUG_OBJECT (v4lsrc, "trying to set_capture %dx%d, palette %d",
+ w, h, palette);
+ /* this only fills in v4lsrc->mmap values */
+ if (!gst_v4lsrc_set_capture (v4lsrc, w, h, palette)) {
+ GST_WARNING_OBJECT (v4lsrc, "could not set_capture %dx%d, palette %d",
+ w, h, palette);
+ return FALSE;
+ }
+
+ /* first try the negotiated settings using try_capture */
+ if (!gst_v4lsrc_try_capture (v4lsrc, w, h, palette)) {
+ GST_DEBUG_OBJECT (v4lsrc, "failed trying palette %d for %dx%d", palette,
+ w, h);
+ return FALSE;
+ }
+
+ if (!gst_v4lsrc_capture_init (v4lsrc))
+ return FALSE;
+
+ if (!gst_v4lsrc_capture_start (v4lsrc))
+ return FALSE;
+
+ return TRUE;
+}
+
+static gboolean
+gst_v4lsrc_query (GstBaseSrc * bsrc, GstQuery * query)
+{
+ GstV4lSrc *v4lsrc;
+ gboolean res = FALSE;
+
+ v4lsrc = GST_V4LSRC (bsrc);
+
+ switch (GST_QUERY_TYPE (query)) {
+ case GST_QUERY_LATENCY:
+ {
+ GstClockTime min_latency, max_latency;
+ gint fps_n, fps_d;
+
+ /* device must be open */
+ if (!GST_V4L_IS_OPEN (v4lsrc))
+ goto done;
+
+ /* we must have a framerate */
+ if (!(res = gst_v4lsrc_get_fps (v4lsrc, &fps_n, &fps_d)))
+ goto done;
+
+ /* min latency is the time to capture one frame */
+ min_latency = gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n);
+
+ /* max latency is total duration of the frame buffer */
+ max_latency = v4lsrc->mbuf.frames * min_latency;
+
+ GST_DEBUG_OBJECT (bsrc,
+ "report latency min %" GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
+
+ /* we are always live, the min latency is 1 frame and the max latency is
+ * the complete buffer of frames. */
+ gst_query_set_latency (query, TRUE, min_latency, max_latency);
+
+ res = TRUE;
+ break;
+ }
+ default:
+ res = GST_BASE_SRC_CLASS (parent_class)->query (bsrc, query);
+ break;
+ }
+done:
+ return res;
+}
+
+/* start and stop are not symmetric -- start will open the device, but not start
+ capture. it's setcaps that will start capture, which is called via basesrc's
+ negotiate method. stop will both stop capture and close the device.
+ */
+static gboolean
+gst_v4lsrc_start (GstBaseSrc * src)
+{
+ GstV4lSrc *v4lsrc = GST_V4LSRC (src);
+
+ v4lsrc->offset = 0;
+
+ return TRUE;
+}
+
+static gboolean
+gst_v4lsrc_stop (GstBaseSrc * src)
+{
+ GstV4lSrc *v4lsrc = GST_V4LSRC (src);
+
+ if (GST_V4L_IS_ACTIVE (v4lsrc) && !gst_v4lsrc_capture_stop (v4lsrc))
+ return FALSE;
+
+ if (GST_V4LELEMENT (v4lsrc)->buffer != NULL) {
+ if (!gst_v4lsrc_capture_deinit (v4lsrc))
+ return FALSE;
+ }
+
+ g_list_free (v4lsrc->colorspaces);
+ v4lsrc->colorspaces = NULL;
+
+ if (v4lsrc->fps_list) {
+ g_value_unset (v4lsrc->fps_list);
+ g_free (v4lsrc->fps_list);
+ v4lsrc->fps_list = NULL;
+ }
+
+ return TRUE;
+}
+
+static GstFlowReturn
+gst_v4lsrc_create (GstPushSrc * src, GstBuffer ** buf)
+{
+ GstV4lSrc *v4lsrc;
+ gint num;
+
+ v4lsrc = GST_V4LSRC (src);
+
+ /* grab a frame from the device */
+ if (!gst_v4lsrc_grab_frame (v4lsrc, &num))
+ return GST_FLOW_ERROR;
+
+ *buf = gst_v4lsrc_buffer_new (v4lsrc, num);
+
+ if (v4lsrc->copy_mode) {
+ GstBuffer *copy = gst_buffer_copy (*buf);
+
+ gst_buffer_unref (*buf);
+ *buf = copy;
+ }
+
+ return GST_FLOW_OK;
+}
projects / mafwsubrenderer / blobdiff