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matroskademux: refactor delta unit handling

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This allows us to skip delta units earlier and is a bit clearer in my
opinion. It also makes only video buffers ever be delta units, not
just for SimpleBlock as before.
This commit is contained in:
Philip Jägenstedt 2010-06-06 15:12:16 +02:00 committed by Sebastian Dröge
parent 6e9e48c0b9
commit 21c84e23e8
1 changed files with 20 additions and 24 deletions
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44
gst/matroska/matroska-demux.c
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@ -4617,6 +4617,7 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
if (ret == GST_FLOW_OK && readblock) {
guint64 duration = 0;
gint64 lace_time = 0;
gboolean delta_unit;
stream = g_ptr_array_index (demux->src, stream_num);
@ -4665,6 +4666,20 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
duration = stream->default_duration * laces;
}
/* else duration is diff between timecode of this and next block */
/* For SimpleBlock, look at the keyframe bit in flags. Otherwise,
a ReferenceBlock implies that this is not a keyframe. In either
case, it only makes sense for video streams. */
delta_unit = stream->type == GST_MATROSKA_TRACK_TYPE_VIDEO &&
((is_simpleblock && !(flags & 0x80)) || referenceblock);
if (delta_unit && stream->set_discont) {
/* When doing seeks or such, we need to restart on key frames or
* decoders might choke. */
GST_DEBUG_OBJECT (demux, "skipping delta unit");
goto done;
}
for (n = 0; n < laces; n++) {
GstBuffer *sub;
@ -4716,6 +4731,11 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
GST_BUFFER_SIZE (buf) - size, lace_size[n]);
GST_DEBUG_OBJECT (demux, "created subbuffer %p", sub);
if (delta_unit)
GST_BUFFER_FLAG_SET (sub, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_UNSET (sub, GST_BUFFER_FLAG_DELTA_UNIT);
if (stream->encodings != NULL && stream->encodings->len > 0)
sub = gst_matroska_decode_buffer (stream, sub);
@ -4814,30 +4834,6 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
gst_matroska_demux_sync_streams (demux);
if (is_simpleblock) {
/* bit 0 of SimpleBlock Flags is "Keyframe, set when the Block
contains only keyframes" */
if (flags & 0x80 || stream->type != GST_MATROSKA_TRACK_TYPE_VIDEO)
GST_BUFFER_FLAG_UNSET (sub, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (sub, GST_BUFFER_FLAG_DELTA_UNIT);
} else {
if (referenceblock) {
GST_BUFFER_FLAG_SET (sub, GST_BUFFER_FLAG_DELTA_UNIT);
} else {
GST_BUFFER_FLAG_UNSET (sub, GST_BUFFER_FLAG_DELTA_UNIT);
}
}
if (GST_BUFFER_FLAG_IS_SET (sub, GST_BUFFER_FLAG_DELTA_UNIT)
&& stream->set_discont) {
/* When doing seeks or such, we need to restart on key frames or
* decoders might choke. */
GST_DEBUG_OBJECT (demux, "skipping delta unit");
gst_buffer_unref (sub);
goto done;
}
if (stream->set_discont) {
GST_DEBUG_OBJECT (demux, "marking DISCONT");
GST_BUFFER_FLAG_SET (sub, GST_BUFFER_FLAG_DISCONT);