mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2025-02-02 12:32:29 +00:00
Code Issues 1 Projects Releases Wiki Activity

avi: implement forward snapping keyframe seeking

Browse source 
In pull mode with an index.
This commit is contained in:
Vincent Penquerc'h 2012-04-26 12:46:11 +01:00
parent 95da93fcb7
commit cfd0da4146
1 changed files with 73 additions and 22 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

95
gst/avi/gstavidemux.c
View file

@ -72,6 +72,16 @@ static GstStaticPadTemplate sink_templ = GST_STATIC_PAD_TEMPLATE ("sink",
GST_STATIC_CAPS ("video/x-msvideo")
);
#ifndef GST_DISABLE_GST_DEBUG
static const char *const snap_types[2][2] = {
{"any", "before"},
{"after", "nearest"},
};
#endif
static void gst_avi_demux_base_init (GstAviDemuxClass * klass);
static void gst_avi_demux_class_init (GstAviDemuxClass * klass);
static void gst_avi_demux_init (GstAviDemux * avi);
static void gst_avi_demux_finalize (GObject * object);
static void gst_avi_demux_reset (GstAviDemux * avi);
@ -3979,15 +3989,18 @@ static gboolean
gst_avi_demux_do_seek (GstAviDemux * avi, GstSegment * segment)
{
GstClockTime seek_time;
gboolean keyframe;
gboolean keyframe, before, after;
guint i, index;
GstAviStream *stream;
seek_time = segment->position;
keyframe = ! !(segment->flags & GST_SEEK_FLAG_KEY_UNIT);
keyframe = !!(segment->flags & GST_SEEK_FLAG_KEY_UNIT);
before = !!(segment->flags & GST_SEEK_FLAG_SNAP_BEFORE);
after = !!(segment->flags & GST_SEEK_FLAG_SNAP_AFTER);
GST_DEBUG_OBJECT (avi, "seek to: %" GST_TIME_FORMAT
" keyframe seeking:%d", GST_TIME_ARGS (seek_time), keyframe);
" keyframe seeking:%d, %s", GST_TIME_ARGS (seek_time), keyframe,
snap_types[before ? 1 : 0][after ? 1 : 0]);
/* FIXME, this code assumes the main stream with keyframes is stream 0,
* which is mostly correct... */
@ -3999,11 +4012,25 @@ gst_avi_demux_do_seek (GstAviDemux * avi, GstSegment * segment)
/* check if we are already on a keyframe */
if (!ENTRY_IS_KEYFRAME (&stream->index[index])) {
GST_DEBUG_OBJECT (avi, "not keyframe, searching back");
/* now go to the previous keyframe, this is where we should start
* decoding from. */
index = gst_avi_demux_index_prev (avi, stream, index, TRUE);
GST_DEBUG_OBJECT (avi, "previous keyframe at %u", index);
gboolean next;
next = after && !before;
if (segment->rate < 0)
next = !next;
if (next) {
GST_DEBUG_OBJECT (avi, "not keyframe, searching forward");
/* now go to the next keyframe, this is where we should start
* decoding from. */
index = gst_avi_demux_index_next (avi, stream, index, TRUE);
GST_DEBUG_OBJECT (avi, "next keyframe at %u", index);
} else {
GST_DEBUG_OBJECT (avi, "not keyframe, searching back");
/* now go to the previous keyframe, this is where we should start
* decoding from. */
index = gst_avi_demux_index_prev (avi, stream, index, TRUE);
GST_DEBUG_OBJECT (avi, "previous keyframe at %u", index);
}
}
/* move the main stream to this position */
@ -4184,7 +4211,7 @@ avi_demux_handle_seek_push (GstAviDemux * avi, GstPad * pad, GstEvent * event)
GstSeekFlags flags;
GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
gint64 cur, stop;
gboolean keyframe;
gboolean keyframe, before, after;
GstAviStream *stream;
guint index;
guint n, str_num;
@ -4224,13 +4251,15 @@ avi_demux_handle_seek_push (GstAviDemux * avi, GstPad * pad, GstEvent * event)
gst_segment_do_seek (&seeksegment, rate, format, flags,
cur_type, cur, stop_type, stop, &update);
keyframe = ! !(flags & GST_SEEK_FLAG_KEY_UNIT);
keyframe = !!(flags & GST_SEEK_FLAG_KEY_UNIT);
cur = seeksegment.position;
before = !!(flags & GST_SEEK_FLAG_SNAP_BEFORE);
after = !!(flags & GST_SEEK_FLAG_SNAP_AFTER);
GST_DEBUG_OBJECT (avi,
"Seek requested: ts %" GST_TIME_FORMAT " stop %" GST_TIME_FORMAT
", kf %u, rate %lf", GST_TIME_ARGS (cur), GST_TIME_ARGS (stop), keyframe,
rate);
", kf %u, %s, rate %lf", GST_TIME_ARGS (cur), GST_TIME_ARGS (stop),
keyframe, snap_types[before ? 1 : 0][after ? 1 : 0], rate);
if (rate < 0) {
GST_DEBUG_OBJECT (avi, "negative rate seek not supported in push mode");
@ -4249,11 +4278,25 @@ avi_demux_handle_seek_push (GstAviDemux * avi, GstPad * pad, GstEvent * event)
/* check if we are already on a keyframe */
if (!ENTRY_IS_KEYFRAME (&stream->index[index])) {
GST_DEBUG_OBJECT (avi, "Entry is not a keyframe - searching back");
/* now go to the previous keyframe, this is where we should start
* decoding from. */
index = gst_avi_demux_index_prev (avi, stream, index, TRUE);
GST_DEBUG_OBJECT (avi, "Found previous keyframe at %u", index);
gboolean next;
next = after && !before;
if (seeksegment.rate < 0)
next = !next;
if (next) {
GST_DEBUG_OBJECT (avi, "Entry is not a keyframe - searching forward");
/* now go to the next keyframe, this is where we should start
* decoding from. */
index = gst_avi_demux_index_next (avi, stream, index, TRUE);
GST_DEBUG_OBJECT (avi, "Found previous keyframe at %u", index);
} else {
GST_DEBUG_OBJECT (avi, "Entry is not a keyframe - searching back");
/* now go to the previous keyframe, this is where we should start
* decoding from. */
index = gst_avi_demux_index_prev (avi, stream, index, TRUE);
GST_DEBUG_OBJECT (avi, "Found previous keyframe at %u", index);
}
}
gst_avi_demux_get_buffer_info (avi, stream, index,
@ -4285,11 +4328,19 @@ avi_demux_handle_seek_push (GstAviDemux * avi, GstPad * pad, GstEvent * event)
/* check if we are already on a keyframe */
if (!ENTRY_IS_KEYFRAME (&str->index[idx])) {
GST_DEBUG_OBJECT (avi, "Entry is not a keyframe - searching back");
/* now go to the previous keyframe, this is where we should start
* decoding from. */
idx = gst_avi_demux_index_prev (avi, str, idx, TRUE);
GST_DEBUG_OBJECT (avi, "Found previous keyframe at %u", idx);
if (after && !before) {
GST_DEBUG_OBJECT (avi, "Entry is not a keyframe - searching forward");
/* now go to the next keyframe, this is where we should start
* decoding from. */
idx = gst_avi_demux_index_next (avi, str, idx, TRUE);
GST_DEBUG_OBJECT (avi, "Found next keyframe at %u", idx);
} else {
GST_DEBUG_OBJECT (avi, "Entry is not a keyframe - searching back");
/* now go to the previous keyframe, this is where we should start
* decoding from. */
idx = gst_avi_demux_index_prev (avi, str, idx, TRUE);
GST_DEBUG_OBJECT (avi, "Found previous keyframe at %u", idx);
}
}
gst_avi_demux_get_buffer_info (avi, str, idx,