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matroskademux: support (pull mode) negative seek rate

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This commit is contained in:
Mark Nauwelaerts 2010-03-23 17:34:50 +01:00
parent 95e38e59a2
commit 9157c262ba
3 changed files with 169 additions and 48 deletions
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209
gst/matroska/matroska-demux.c
View file

@ -408,6 +408,11 @@ gst_matroska_demux_reset (GstElement * element)
demux->cluster_time = GST_CLOCK_TIME_NONE;
demux->cluster_offset = 0;
demux->from_offset = -1;
demux->to_offset = G_MAXINT64;
demux->seek_index = NULL;
demux->seek_entry = 0;
if (demux->close_segment) {
gst_event_unref (demux->close_segment);
demux->close_segment = NULL;
@ -2019,8 +2024,8 @@ gst_matroska_index_seek_find (GstMatroskaIndex * i1, GstClockTime * time,
static GstMatroskaIndex *
gst_matroskademux_do_index_seek (GstMatroskaDemux * demux,
GstMatroskaTrackContext * track, gint64 seek_pos, gint64 segment_stop,
gboolean keyunit)
GstMatroskaTrackContext * track, gint64 seek_pos, GArray ** _index,
gint * _entry_index)
{
GstMatroskaIndex *entry = NULL;
GArray *index;
@ -2043,6 +2048,11 @@ gst_matroskademux_do_index_seek (GstMatroskaDemux * demux,
if (entry == NULL)
entry = &g_array_index (index, GstMatroskaIndex, 0);
if (_index)
*_index = index;
if (_entry_index)
*_entry_index = entry - (GstMatroskaIndex *) index->data;
return entry;
}
@ -2155,6 +2165,57 @@ gst_matroska_demux_get_seek_track (GstMatroskaDemux * demux,
return track;
}
static gboolean
gst_matroska_demux_move_to_entry (GstMatroskaDemux * demux,
GstMatroskaIndex * entry, gboolean reset)
{
gint i;
GST_OBJECT_LOCK (demux);
/* seek (relative to matroska segment) */
if (gst_ebml_read_seek (GST_EBML_READ (demux),
entry->pos + demux->ebml_segment_start) != GST_FLOW_OK) {
GST_DEBUG_OBJECT (demux, "Failed to seek to offset %" G_GUINT64_FORMAT,
entry->pos + demux->ebml_segment_start);
goto seek_error;
}
GST_DEBUG_OBJECT (demux, "Seeked to offset %" G_GUINT64_FORMAT ", block %d, "
"time %" GST_TIME_FORMAT, entry->pos + demux->ebml_segment_start,
entry->block, GST_TIME_ARGS (entry->time));
/* update the time */
g_assert (demux->src->len == demux->num_streams);
for (i = 0; i < demux->src->len; i++) {
GstMatroskaTrackContext *context = g_ptr_array_index (demux->src, i);
context->pos = entry->time;
context->set_discont = TRUE;
context->last_flow = GST_FLOW_OK;
context->eos = FALSE;
context->from_time = GST_CLOCK_TIME_NONE;
}
demux->segment.last_stop = entry->time;
demux->seek_block = entry->block;
demux->last_stop_end = GST_CLOCK_TIME_NONE;
if (reset) {
demux->from_offset = -1;
demux->to_offset = G_MAXINT64;
}
GST_OBJECT_UNLOCK (demux);
return TRUE;
seek_error:
{
GST_OBJECT_UNLOCK (demux);
GST_ELEMENT_ERROR (demux, STREAM, DEMUX, (NULL), ("Got a seek error"));
return FALSE;
}
}
static gboolean
gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
GstPad * pad, GstEvent * event)
@ -2166,7 +2227,6 @@ gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
gboolean flush, keyunit;
gdouble rate;
gint64 cur, stop;
gint i;
GstMatroskaTrackContext *track = NULL;
GstSegment seeksegment = { 0, };
gboolean update;
@ -2185,12 +2245,6 @@ gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
return FALSE;
}
/* cannot yet do backwards playback */
if (rate <= 0.0) {
GST_DEBUG_OBJECT (demux, "Can only seek with positive rate");
return FALSE;
}
/* copy segment, we need this because we still need the old
* segment when we close the current segment. */
memcpy (&seeksegment, &demux->segment, sizeof (GstSegment));
@ -2205,9 +2259,9 @@ gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
/* check sanity before we start flushing and all that */
GST_OBJECT_LOCK (demux);
if ((entry =
gst_matroskademux_do_index_seek (demux, track,
seeksegment.last_stop, -1, FALSE)) == NULL) {
if ((entry = gst_matroskademux_do_index_seek (demux, track,
seeksegment.last_stop, &demux->seek_index, &demux->seek_entry)) ==
NULL) {
GST_DEBUG_OBJECT (demux, "No matching seek entry in index");
GST_OBJECT_UNLOCK (demux);
return FALSE;
@ -2233,19 +2287,6 @@ gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
GST_DEBUG_OBJECT (demux, "Waiting for streaming to stop");
GST_PAD_STREAM_LOCK (demux->sinkpad);
GST_OBJECT_LOCK (demux);
/* seek (relative to matroska segment) */
if (gst_ebml_read_seek (GST_EBML_READ (demux),
entry->pos + demux->ebml_segment_start) != GST_FLOW_OK) {
GST_DEBUG_OBJECT (demux, "Failed to seek to offset %" G_GUINT64_FORMAT,
entry->pos + demux->ebml_segment_start);
goto seek_error;
}
GST_DEBUG_OBJECT (demux, "Seeked to offset %" G_GUINT64_FORMAT, entry->pos +
demux->ebml_segment_start);
if (keyunit) {
GST_DEBUG_OBJECT (demux, "seek to key unit, adjusting segment start to %"
GST_TIME_FORMAT, GST_TIME_ARGS (entry->time));
@ -2254,8 +2295,6 @@ gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
seeksegment.time = entry->time;
}
GST_OBJECT_UNLOCK (demux);
if (flush) {
GST_DEBUG_OBJECT (demux, "Stopping flush");
gst_pad_push_event (demux->sinkpad, gst_event_new_flush_stop ());
@ -2279,6 +2318,10 @@ gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
memcpy (&demux->segment, &seeksegment, sizeof (GstSegment));
GST_OBJECT_UNLOCK (demux);
/* update some (segment) state */
if (!gst_matroska_demux_move_to_entry (demux, entry, TRUE))
goto seek_error;
/* notify start of new segment */
if (demux->segment.flags & GST_SEEK_FLAG_SEGMENT) {
GstMessage *msg;
@ -2293,22 +2336,9 @@ gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
gst_event_unref (demux->new_segment);
demux->new_segment = gst_event_new_new_segment_full (FALSE,
demux->segment.rate, demux->segment.applied_rate, demux->segment.format,
demux->segment.last_stop, demux->segment.stop, demux->segment.time);
demux->segment.start, demux->segment.stop, demux->segment.time);
GST_OBJECT_UNLOCK (demux);
/* update the time */
g_assert (demux->src->len == demux->num_streams);
for (i = 0; i < demux->src->len; i++) {
GstMatroskaTrackContext *context = g_ptr_array_index (demux->src, i);
context->pos = entry->time;
context->set_discont = TRUE;
context->last_flow = GST_FLOW_OK;
context->eos = FALSE;
}
demux->segment.last_stop = entry->time;
demux->seek_block = entry->block;
demux->last_stop_end = GST_CLOCK_TIME_NONE;
/* restart our task since it might have been stopped when we did the
* flush. */
demux->segment_running = TRUE;
@ -2359,6 +2389,55 @@ gst_matroska_demux_handle_src_event (GstPad * pad, GstEvent * event)
return res;
}
static GstFlowReturn
gst_matroska_demux_seek_to_previous_keyframe (GstMatroskaDemux * demux)
{
GstFlowReturn ret = GST_FLOW_UNEXPECTED;
gboolean done = TRUE;
gint i;
g_return_val_if_fail (demux->seek_index, GST_FLOW_UNEXPECTED);
g_return_val_if_fail (demux->seek_entry < demux->seek_index->len,
GST_FLOW_UNEXPECTED);
GST_DEBUG_OBJECT (demux, "locating previous keyframe");
if (!demux->seek_entry) {
GST_DEBUG_OBJECT (demux, "no earlier index entry");
goto exit;
}
for (i = 0; i < demux->src->len; i++) {
GstMatroskaTrackContext *stream = g_ptr_array_index (demux->src, i);
GST_DEBUG_OBJECT (demux, "segment start %" GST_TIME_FORMAT
", stream %d at %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->segment.start), stream->index,
GST_TIME_ARGS (stream->from_time));
if (GST_CLOCK_TIME_IS_VALID (stream->from_time)) {
if (stream->from_time > demux->segment.start) {
GST_DEBUG_OBJECT (demux, "stream %d not finished yet", stream->index);
done = FALSE;
}
}
}
if (!done) {
GstMatroskaIndex *entry;
entry = &g_array_index (demux->seek_index, GstMatroskaIndex,
--demux->seek_entry);
if (!gst_matroska_demux_move_to_entry (demux, entry, FALSE))
goto exit;
demux->to_offset = demux->from_offset;
demux->from_offset = -1;
ret = GST_FLOW_OK;
}
exit:
return ret;
}
static GstFlowReturn
gst_matroska_demux_parse_header (GstMatroskaDemux * demux)
{
@ -4099,6 +4178,9 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
gint64 time = 0;
gint flags = 0;
gint64 referenceblock = 0;
gint64 offset;
offset = demux->parent.offset;
while (ret == GST_FLOW_OK) {
if (!is_simpleblock) {
@ -4409,16 +4491,20 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
GST_DEBUG_OBJECT (demux,
"Stream %d after segment stop %" GST_TIME_FORMAT, stream->index,
GST_TIME_ARGS (demux->segment.stop));
stream->eos = TRUE;
ret = GST_FLOW_OK;
/* combine flows */
ret = gst_matroska_demux_combine_flows (demux, stream, ret);
goto done;
gst_buffer_unref (sub);
goto eos;
}
if (offset >= demux->to_offset) {
GST_DEBUG_OBJECT (demux, "Stream %d after playback section",
stream->index);
gst_buffer_unref (sub);
goto eos;
}
/* handle gaps, e.g. non-zero start-time, or an cue index entry
* that landed us with timestamps not quite intended */
if (GST_CLOCK_TIME_IS_VALID (demux->segment.last_stop)) {
if (GST_CLOCK_TIME_IS_VALID (demux->segment.last_stop) &&
demux->segment.rate > 0.0) {
GstClockTimeDiff diff;
/* only send newsegments with increasing start times,
@ -4511,6 +4597,12 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
stream->set_discont = FALSE;
}
/* reverse playback book-keeping */
if (!GST_CLOCK_TIME_IS_VALID (stream->from_time))
stream->from_time = lace_time;
if (demux->from_offset == -1)
demux->from_offset = offset;
GST_DEBUG_OBJECT (demux,
"Pushing lace %d, data of size %d for stream %d, time=%"
GST_TIME_FORMAT " and duration=%" GST_TIME_FORMAT, n,
@ -4561,6 +4653,16 @@ done:
g_free (lace_size);
return ret;
/* EXITS */
eos:
{
stream->eos = TRUE;
ret = GST_FLOW_OK;
/* combine flows */
ret = gst_matroska_demux_combine_flows (demux, stream, ret);
goto done;
}
}
/* return FALSE if block(group) should be skipped (due to a seek) */
@ -5190,6 +5292,8 @@ gst_matroska_demux_loop (GstPad * pad)
}
ret = gst_matroska_demux_loop_stream (demux);
if (ret == GST_FLOW_UNEXPECTED)
goto eos;
if (ret != GST_FLOW_OK)
goto pause;
@ -5208,7 +5312,7 @@ gst_matroska_demux_loop (GstPad * pad)
GST_INFO_OBJECT (demux, "All streams are EOS");
ret = GST_FLOW_UNEXPECTED;
goto pause;
goto eos;
}
next:
@ -5221,6 +5325,15 @@ next:
return;
/* ERRORS */
eos:
{
if (demux->segment.rate < 0.0) {
ret = gst_matroska_demux_seek_to_previous_keyframe (demux);
if (ret == GST_FLOW_OK)
goto next;
}
/* fall-through */
}
pause:
{
const gchar *reason = gst_flow_get_name (ret);

6
gst/matroska/matroska-demux.h
View file

@ -105,6 +105,12 @@ typedef struct _GstMatroskaDemux {
/* some state saving */
GstClockTime cluster_time;
guint64 cluster_offset;
/* reverse playback */
GArray *seek_index;
gint seek_entry;
gint64 from_offset;
gint64 to_offset;
} GstMatroskaDemux;
typedef struct _GstMatroskaDemuxClass {

2
gst/matroska/matroska-ids.h
View file

@ -466,6 +466,8 @@ struct _GstMatroskaTrackContext {
GstCaps *caps;
guint index;
GstFlowReturn last_flow;
/* reverse playback */
GstClockTime from_time;
GArray *index_table;