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matroskamux: Write previous cluster's size

Browse source 
This is useful for backwards playback, which should be implemented
in matroskademux at some point.
This commit is contained in:
Sebastian Dröge 2010-05-01 14:20:59 +02:00
parent 1e1cf5df70
commit ad1c01661f
2 changed files with 6 additions and 1 deletions
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4
gst/matroska/matroska-mux.c
View file

@ -538,6 +538,7 @@ gst_matroska_mux_reset (GstElement * element)
mux->cluster = 0;
mux->cluster_time = 0;
mux->cluster_pos = 0;
mux->prev_cluster_size = 0;
/* reset tags */
gst_tag_setter_reset_tags (GST_TAG_SETTER (mux));
@ -2509,12 +2510,15 @@ gst_matroska_mux_write_data (GstMatroskaMux * mux, GstMatroskaPad * collect_pad)
|| is_video_keyframe) {
gst_ebml_write_master_finish (ebml, mux->cluster);
mux->prev_cluster_size = ebml->pos - mux->cluster_pos;
mux->cluster_pos = ebml->pos;
mux->cluster =
gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_CLUSTER);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_CLUSTERTIMECODE,
GST_BUFFER_TIMESTAMP (buf) / mux->time_scale);
mux->cluster_time = GST_BUFFER_TIMESTAMP (buf);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_PREVSIZE,
mux->prev_cluster_size);
}
} else {
/* first cluster */

3
gst/matroska/matroska-mux.h
View file

@ -116,7 +116,8 @@ typedef struct _GstMatroskaMux {
/* current cluster */
guint64 cluster,
cluster_time,
cluster_pos;
cluster_pos,
prev_cluster_size;
} GstMatroskaMux;