[vlc-devel] [PATCH] Fix seeking without cues for clusters without I frames
Denis Charmet
typx at dinauz.org
Thu Apr 12 02:08:30 CEST 2012
If no frame was found in the cluster rewind to previous seekpoint
Thanks to Haali.
---
modules/demux/mkv/matroska_segment.cpp | 96 +++++++++++++++-----------
modules/demux/mkv/matroska_segment.hpp | 2 +-
modules/demux/mkv/matroska_segment_parse.cpp | 5 +-
3 files changed, 59 insertions(+), 44 deletions(-)
diff --git a/modules/demux/mkv/matroska_segment.cpp b/modules/demux/mkv/matroska_segment.cpp
index 637c5f7..de3c027 100644
--- a/modules/demux/mkv/matroska_segment.cpp
+++ b/modules/demux/mkv/matroska_segment.cpp
@@ -691,6 +691,7 @@ void matroska_segment_c::Seek( mtime_t i_date, mtime_t i_time_offset, int64_t i_
spoint *p_first = NULL;
spoint *p_last = NULL;
int i_cat;
+ bool b_has_key = false;
if( i_global_position >= 0 )
{
@@ -717,7 +718,7 @@ void matroska_segment_c::Seek( mtime_t i_date, mtime_t i_time_offset, int64_t i_
( i_index > 0 &&
p_indexes[i_index - 1].i_position < (int64_t)cluster->GetElementPosition() ) )
{
- ParseCluster();
+ ParseCluster(false);
IndexAppendCluster( cluster );
}
if( es.I_O().getFilePointer() >= (unsigned) i_global_position )
@@ -744,9 +745,9 @@ void matroska_segment_c::Seek( mtime_t i_date, mtime_t i_time_offset, int64_t i_
}
#endif
+ int i_idx = 0;
if ( i_index > 0 )
{
- int i_idx = 0;
for( ; i_idx < i_index; i_idx++ )
if( p_indexes[i_idx].i_time + i_time_offset > i_date )
@@ -773,9 +774,9 @@ void matroska_segment_c::Seek( mtime_t i_date, mtime_t i_time_offset, int64_t i_
es_out_Control( sys.demuxer.out, ES_OUT_SET_NEXT_DISPLAY_TIME, i_date );
/* now parse until key frame */
- const int es[3] = { VIDEO_ES, AUDIO_ES, SPU_ES };
- i_cat = es[0];
- for( int i = 0; i < 2; i_cat = es[++i] )
+ const int es_types[3] = { VIDEO_ES, AUDIO_ES, SPU_ES };
+ i_cat = es_types[0];
+ for( int i = 0; i < 2; i_cat = es_types[++i] )
{
for( i_track = 0; i_track < tracks.size(); i_track++ )
{
@@ -811,49 +812,63 @@ void matroska_segment_c::Seek( mtime_t i_date, mtime_t i_time_offset, int64_t i_
if( unlikely( !p_first ) )
return;
- while( i_pts < i_date )
+ for(;;)
{
- bool b_key_picture;
- bool b_discardable_picture;
- if( BlockGet( block, simpleblock, &b_key_picture, &b_discardable_picture, &i_block_duration ) )
- {
- msg_Warn( &sys.demuxer, "cannot get block EOF?" );
-
- return;
- }
-
- /* check if block's track is in our list */
- for( i_track = 0; i_track < tracks.size(); i_track++ )
+ while( i_pts < i_date )
{
- if( (simpleblock && tracks[i_track]->i_number == simpleblock->TrackNum()) ||
- (block && tracks[i_track]->i_number == block->TrackNum()) )
- break;
- }
+ bool b_key_picture;
+ bool b_discardable_picture;
+ if( BlockGet( block, simpleblock, &b_key_picture, &b_discardable_picture, &i_block_duration ) )
+ {
+ msg_Warn( &sys.demuxer, "cannot get block EOF?" );
+ return;
+ }
- if( simpleblock )
- i_pts = sys.i_chapter_time + simpleblock->GlobalTimecode() / (mtime_t) 1000;
- else
- i_pts = sys.i_chapter_time + block->GlobalTimecode() / (mtime_t) 1000;
- if( i_track < tracks.size() )
- {
- if( tracks[i_track]->fmt.i_cat == i_cat && b_key_picture )
+ /* check if block's track is in our list */
+ for( i_track = 0; i_track < tracks.size(); i_track++ )
{
- /* get the seekpoint */
- spoint * sp;
- for( sp = p_first; sp; sp = sp->p_next )
- if( sp->i_track == i_track )
- break;
+ if( (simpleblock && tracks[i_track]->i_number == simpleblock->TrackNum()) ||
+ (block && tracks[i_track]->i_number == block->TrackNum()) )
+ break;
+ }
- sp->i_date = i_pts;
- if( simpleblock )
- sp->i_seek_pos = simpleblock->GetElementPosition();
- else
- sp->i_seek_pos = i_block_pos;
- sp->i_cluster_pos = i_cluster_pos;
+ if( simpleblock )
+ i_pts = sys.i_chapter_time + simpleblock->GlobalTimecode() / (mtime_t) 1000;
+ else
+ i_pts = sys.i_chapter_time + block->GlobalTimecode() / (mtime_t) 1000;
+ if( i_track < tracks.size() )
+ {
+ if( tracks[i_track]->fmt.i_cat == i_cat && b_key_picture )
+ {
+ /* get the seekpoint */
+ spoint * sp;
+ for( sp = p_first; sp; sp = sp->p_next )
+ if( sp->i_track == i_track )
+ break;
+
+ sp->i_date = i_pts;
+ if( simpleblock )
+ sp->i_seek_pos = simpleblock->GetElementPosition();
+ else
+ sp->i_seek_pos = i_block_pos;
+ sp->i_cluster_pos = i_cluster_pos;
+ b_has_key = true;
+ }
}
+
+ delete block;
}
+ if( b_has_key || !i_idx )
+ break;
- delete block;
+ /* No key picture was found in the cluster seek to previous seekpoint */
+ i_date = i_time_offset + p_indexes[i_idx].i_time;
+ i_idx--;
+ i_pts = 0;
+ es.I_O().setFilePointer( p_indexes[i_idx].i_position );
+ delete ep;
+ ep = new EbmlParser( &es, segment, &sys.demuxer );
+ cluster = NULL;
}
/* rewind to the last I img */
@@ -866,7 +881,6 @@ void matroska_segment_c::Seek( mtime_t i_date, mtime_t i_time_offset, int64_t i_
es_out_Control( sys.demuxer.out, ES_OUT_SET_PCR, VLC_TS_0 + sys.i_pcr );
cluster = (KaxCluster *) ep->UnGet( p_min->i_seek_pos, p_min->i_cluster_pos );
-
/* hack use BlockGet to get the cluster then goto the wanted block */
if ( !cluster )
{
diff --git a/modules/demux/mkv/matroska_segment.hpp b/modules/demux/mkv/matroska_segment.hpp
index 713f498..1e69016 100644
--- a/modules/demux/mkv/matroska_segment.hpp
+++ b/modules/demux/mkv/matroska_segment.hpp
@@ -124,7 +124,7 @@ private:
void ParseTracks( KaxTracks *tracks );
void ParseChapterAtom( int i_level, KaxChapterAtom *ca, chapter_item_c & chapters );
void ParseTrackEntry( KaxTrackEntry *m );
- void ParseCluster( );
+ void ParseCluster( bool b_update_start_time = true );
void ParseSimpleTags( KaxTagSimple *tag );
void IndexAppendCluster( KaxCluster *cluster );
};
diff --git a/modules/demux/mkv/matroska_segment_parse.cpp b/modules/demux/mkv/matroska_segment_parse.cpp
index 3964674..7d7cc3f 100644
--- a/modules/demux/mkv/matroska_segment_parse.cpp
+++ b/modules/demux/mkv/matroska_segment_parse.cpp
@@ -1094,7 +1094,7 @@ void matroska_segment_c::ParseChapters( KaxChapters *chapters )
}
}
-void matroska_segment_c::ParseCluster( )
+void matroska_segment_c::ParseCluster( bool b_update_start_time )
{
EbmlElement *el;
EbmlMaster *m;
@@ -1117,6 +1117,7 @@ void matroska_segment_c::ParseCluster( )
}
}
- i_start_time = cluster->GlobalTimecode() / 1000;
+ if( b_update_start_time )
+ i_start_time = cluster->GlobalTimecode() / 1000;
}
--
1.7.9.5
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