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flvdemux: support (pull mode) negative seek rate

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This commit is contained in:
Mark Nauwelaerts 2010-03-31 14:40:50 +02:00
parent d3ae0ef71f
commit 1c7b1d110b
3 changed files with 151 additions and 36 deletions
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123
gst/flv/gstflvdemux.c
View file

@ -565,10 +565,80 @@ beach:
return ret;
}
static void
gst_flv_demux_move_to_offset (GstFLVDemux * demux, gint64 offset,
gboolean reset)
{
demux->offset = offset;
/* Tell all the stream we moved to a different position (discont) */
demux->audio_need_discont = TRUE;
demux->video_need_discont = TRUE;
/* next section setup */
demux->from_offset = -1;
demux->audio_done = demux->video_done = FALSE;
demux->audio_first_ts = demux->video_first_ts = GST_CLOCK_TIME_NONE;
if (reset) {
demux->from_offset = -1;
demux->to_offset = G_MAXINT64;
}
/* If we seeked at the beginning of the file parse the header again */
if (G_UNLIKELY (!demux->offset)) {
demux->state = FLV_STATE_HEADER;
} else { /* or parse a tag */
demux->state = FLV_STATE_TAG_TYPE;
}
}
static GstFlowReturn
gst_flv_demux_seek_to_prev_keyframe (GstFLVDemux * demux)
{
return GST_FLOW_OK;
GstFlowReturn ret = GST_FLOW_UNEXPECTED;
GstIndexEntry *entry = NULL;
GST_DEBUG_OBJECT (demux,
"terminated section started at offset %" G_GINT64_FORMAT,
demux->from_offset);
/* we are done if we got all audio and video */
if ((!GST_CLOCK_TIME_IS_VALID (demux->audio_first_ts) ||
demux->audio_first_ts < demux->segment.start) &&
(!GST_CLOCK_TIME_IS_VALID (demux->video_first_ts) ||
demux->video_first_ts < demux->segment.start))
goto done;
if (demux->from_offset <= 0)
goto done;
GST_DEBUG_OBJECT (demux, "locating previous position");
/* locate index entry before previous start position */
if (demux->index)
entry = gst_index_get_assoc_entry (demux->index, demux->index_id,
GST_INDEX_LOOKUP_BEFORE, GST_ASSOCIATION_FLAG_KEY_UNIT,
GST_FORMAT_BYTES, demux->from_offset - 1);
if (entry) {
gint64 bytes, time;
gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &time);
GST_DEBUG_OBJECT (demux, "found index entry for %" G_GINT64_FORMAT
" at %" GST_TIME_FORMAT ", seeking to %" G_GINT64_FORMAT,
demux->offset - 1, GST_TIME_ARGS (time), bytes);
/* setup for next section */
demux->to_offset = demux->from_offset;
gst_flv_demux_move_to_offset (demux, bytes, FALSE);
ret = GST_FLOW_OK;
}
done:
return ret;
}
static gboolean
@ -702,10 +772,12 @@ gst_flv_demux_loop (GstPad * pad)
demux = GST_FLV_DEMUX (gst_pad_get_parent (pad));
if (demux->segment.rate >= 0) {
if (TRUE || demux->segment.rate >= 0) {
/* pull in data */
switch (demux->state) {
case FLV_STATE_TAG_TYPE:
if (demux->from_offset == -1)
demux->from_offset = demux->offset;
ret = gst_flv_demux_pull_tag (pad, demux);
/* if we have seen real data, we probably passed a possible metadata
* header located at start. So if we do not yet have an index,
@ -738,16 +810,23 @@ gst_flv_demux_loop (GstPad * pad)
break;
}
/* pause if something went wrong */
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto pause;
if (demux->segment.rate < 0.0) {
/* check end of section */
if ((gint64) demux->offset >= demux->to_offset ||
demux->segment.last_stop >= demux->segment.stop + 2 * GST_SECOND ||
(demux->audio_done && demux->video_done))
ret = gst_flv_demux_seek_to_prev_keyframe (demux);
} else {
/* check EOS condition */
if ((demux->segment.stop != -1) &&
(demux->segment.last_stop >= demux->segment.stop)) {
ret = GST_FLOW_UNEXPECTED;
goto pause;
}
}
/* pause if something went wrong or at end */
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto pause;
} else { /* Reverse playback */
/* pull in data */
switch (demux->state) {
@ -849,7 +928,7 @@ gst_flv_demux_find_offset (GstFLVDemux * demux, GstSegment * segment)
g_return_val_if_fail (segment != NULL, 0);
time = segment->start;
time = segment->last_stop;
if (demux->index) {
/* Let's check if we have an index entry for that seek time */
@ -863,7 +942,7 @@ gst_flv_demux_find_offset (GstFLVDemux * demux, GstSegment * segment)
GST_DEBUG_OBJECT (demux, "found index entry for %" GST_TIME_FORMAT
" at %" GST_TIME_FORMAT ", seeking to %" G_GINT64_FORMAT,
GST_TIME_ARGS (segment->start), GST_TIME_ARGS (time), bytes);
GST_TIME_ARGS (segment->last_stop), GST_TIME_ARGS (time), bytes);
/* Key frame seeking */
if (segment->flags & GST_SEEK_FLAG_KEY_UNIT) {
@ -1103,18 +1182,8 @@ gst_flv_demux_handle_seek_pull (GstFLVDemux * demux, GstEvent * event,
goto exit;
}
/* now index should be as reliable as it can be for current purpose */
demux->offset = gst_flv_demux_find_offset (demux, &seeksegment);
/* Tell all the stream we moved to a different position (discont) */
demux->audio_need_discont = TRUE;
demux->video_need_discont = TRUE;
/* If we seeked at the beginning of the file parse the header again */
if (G_UNLIKELY (!demux->offset)) {
demux->state = FLV_STATE_HEADER;
} else { /* or parse a tag */
demux->state = FLV_STATE_TAG_TYPE;
}
gst_flv_demux_move_to_offset (demux,
gst_flv_demux_find_offset (demux, &seeksegment), TRUE);
ret = TRUE;
} else {
ret = TRUE;
@ -1171,6 +1240,18 @@ gst_flv_demux_handle_seek_pull (GstFLVDemux * demux, GstEvent * event,
gst_event_unref (demux->new_seg_event);
demux->new_seg_event = NULL;
}
if (demux->segment.rate < 0.0) {
/* we can't generate a segment by locking on
* to the first timestamp we see */
GST_DEBUG_OBJECT (demux, "preparing newsegment from %"
GST_TIME_FORMAT " to %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->segment.start),
GST_TIME_ARGS (demux->segment.stop));
demux->new_seg_event =
gst_event_new_new_segment (FALSE, demux->segment.rate,
demux->segment.format, demux->segment.start,
demux->segment.stop, demux->segment.start);
}
}
exit:

8
gst/flv/gstflvdemux.h
View file

@ -129,6 +129,14 @@ struct _GstFLVDemux
GstClockTime index_max_time;
gint64 index_max_pos;
/* reverse playback */
GstClockTime video_first_ts;
GstClockTime audio_first_ts;
gboolean video_done;
gboolean audio_done;
gint64 from_offset;
gint64 to_offset;
};
struct _GstFLVDemuxClass

26
gst/flv/gstflvparse.c
View file

@ -856,6 +856,9 @@ gst_flv_parse_tag_audio (GstFLVDemux * demux, GstBuffer * buffer)
if (!GST_CLOCK_TIME_IS_VALID (demux->audio_start)) {
demux->audio_start = GST_BUFFER_TIMESTAMP (outbuf);
}
if (!GST_CLOCK_TIME_IS_VALID (demux->audio_first_ts)) {
demux->audio_first_ts = GST_BUFFER_TIMESTAMP (outbuf);
}
if (G_UNLIKELY (!demux->no_more_pads
&& (GST_CLOCK_DIFF (demux->audio_start,
@ -870,6 +873,15 @@ gst_flv_parse_tag_audio (GstFLVDemux * demux, GstBuffer * buffer)
/* Push downstream */
ret = gst_pad_push (demux->audio_pad, outbuf);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
if (demux->segment.rate < 0.0 && ret == GST_FLOW_UNEXPECTED &&
demux->segment.last_stop > demux->segment.stop) {
/* In reverse playback we can get a GST_FLOW_UNEXPECTED when
* we are at the end of the segment, so we just need to jump
* back to the previous section. */
GST_DEBUG_OBJECT (demux, "downstream has reached end of segment");
demux->audio_done = TRUE;
ret = GST_FLOW_OK;
} else {
GST_WARNING_OBJECT (demux, "failed pushing a %" G_GUINT64_FORMAT
" bytes audio buffer: %s", demux->tag_data_size,
gst_flow_get_name (ret));
@ -878,6 +890,7 @@ gst_flv_parse_tag_audio (GstFLVDemux * demux, GstBuffer * buffer)
}
goto beach;
}
}
demux->audio_linked = TRUE;
@ -1192,6 +1205,9 @@ gst_flv_parse_tag_video (GstFLVDemux * demux, GstBuffer * buffer)
if (!GST_CLOCK_TIME_IS_VALID (demux->video_start)) {
demux->video_start = GST_BUFFER_TIMESTAMP (outbuf);
}
if (!GST_CLOCK_TIME_IS_VALID (demux->audio_first_ts)) {
demux->video_first_ts = GST_BUFFER_TIMESTAMP (outbuf);
}
if (G_UNLIKELY (!demux->no_more_pads
&& (GST_CLOCK_DIFF (demux->video_start,
@ -1207,6 +1223,15 @@ gst_flv_parse_tag_video (GstFLVDemux * demux, GstBuffer * buffer)
ret = gst_pad_push (demux->video_pad, outbuf);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
if (demux->segment.rate < 0.0 && ret == GST_FLOW_UNEXPECTED &&
demux->segment.last_stop > demux->segment.stop) {
/* In reverse playback we can get a GST_FLOW_UNEXPECTED when
* we are at the end of the segment, so we just need to jump
* back to the previous section. */
GST_DEBUG_OBJECT (demux, "downstream has reached end of segment");
demux->video_done = TRUE;
ret = GST_FLOW_OK;
} else {
GST_WARNING_OBJECT (demux, "failed pushing a %" G_GUINT64_FORMAT
" bytes video buffer: %s", demux->tag_data_size,
gst_flow_get_name (ret));
@ -1215,6 +1240,7 @@ gst_flv_parse_tag_video (GstFLVDemux * demux, GstBuffer * buffer)
}
goto beach;
}
}
demux->video_linked = TRUE;