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Commit 885249c1 authored by Francois Cartegnie's avatar Francois Cartegnie
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demux: mp4: unify and simplify samples reading

parent 503cbba7
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Showing with 77 additions and 82 deletions
modules/demux/mp4/mp4.c
View file @ 885249c1
......@@ -119,7 +119,7 @@ static void MP4_TrackUnselect(demux_t *, mp4_track_t * );
static int MP4_TrackSeek ( demux_t *, mp4_track_t *, mtime_t );
static uint64_t MP4_TrackGetPos ( mp4_track_t * );
static uint32_t MP4_TrackSampleSize( mp4_track_t *, uint32_t * );
static uint32_t MP4_TrackGetReadSize( mp4_track_t *, uint32_t * );
static int MP4_TrackNextSample( demux_t *, mp4_track_t *, uint32_t );
static void MP4_TrackSetELST( demux_t *, mp4_track_t *, int64_t );
......@@ -863,7 +863,7 @@ static int Demux( demux_t *p_demux )
#endif
uint32_t i_nb_samples = 0;
uint32_t i_samplessize = MP4_TrackSampleSize( tk, &i_nb_samples );
uint32_t i_samplessize = MP4_TrackGetReadSize( tk, &i_nb_samples );
if( i_samplessize > 0 )
{
block_t *p_block;
......@@ -1565,7 +1565,7 @@ static void LoadChapterApple( demux_t *p_demux, mp4_track_t *tk )
const int64_t i_dts = MP4_TrackGetDTS( p_demux, tk );
const int64_t i_pts_delta = MP4_TrackGetPTSDelta( p_demux, tk );
uint32_t i_nb_samples = 0;
const uint32_t i_size = MP4_TrackSampleSize( tk, &i_nb_samples );
const uint32_t i_size = MP4_TrackGetReadSize( tk, &i_nb_samples );
if( i_size > 0 && !stream_Seek( p_demux->s, MP4_TrackGetPos( tk ) ) )
{
......@@ -3339,63 +3339,89 @@ static int MP4_TrackSeek( demux_t *p_demux, mp4_track_t *p_track,
*
*/
#define QT_V0_MAX_SAMPLES 1024
static uint32_t MP4_TrackSampleSize( mp4_track_t *p_track, uint32_t *pi_nb_samples )
static uint32_t MP4_TrackGetReadSize( mp4_track_t *p_track, uint32_t *pi_nb_samples )
{
uint32_t i_size;
MP4_Box_data_sample_soun_t *p_soun;
uint32_t i_size = 0;
*pi_nb_samples = 0;
if( p_track->i_sample_size == 0 )
{
/* most simple case */
*pi_nb_samples = 1;
return p_track->p_sample_size[p_track->i_sample];
}
if ( p_track->i_sample == p_track->i_sample_count )
return 0;
if( p_track->fmt.i_cat != AUDIO_ES )
if ( p_track->fmt.i_cat != AUDIO_ES )
{
*pi_nb_samples = 1;
return p_track->i_sample_size;
}
p_soun = p_track->p_sample->data.p_sample_soun;
if( p_soun->i_qt_version == 1 )
{
uint32_t i_samples = p_track->chunk[p_track->i_chunk].i_sample_count;
if( p_track->fmt.audio.i_blockalign > 1 )
i_samples = p_soun->i_sample_per_packet;
i_size = i_samples / p_soun->i_sample_per_packet;
if ( UINT32_MAX / i_size >= p_soun->i_bytes_per_frame )
i_size *= p_soun->i_bytes_per_frame;
if( p_track->i_sample_size == 0 ) /* all sizes are different */
return p_track->p_sample_size[p_track->i_sample];
else
i_size = UINT32_MAX;
*pi_nb_samples = i_samples;
}
else if( p_track->i_sample_size > 256 )
{
/* We do that so we don't read too much data
* (in this case we are likely dealing with compressed data) */
i_size = p_track->i_sample_size;
*pi_nb_samples = 1;
return p_track->i_sample_size;
}
else
{
mp4_chunk_t *p_chunk = &p_track->chunk[p_track->i_chunk];
int64_t i_length = CLOCK_FREQ / 10;
uint32_t i_samples = 0;
uint32_t i_maxsamples = 0;
const MP4_Box_data_sample_soun_t *p_soun = p_track->p_sample->data.p_sample_soun;
const mp4_chunk_t *p_chunk = &p_track->chunk[p_track->i_chunk];
uint32_t i_max_samples = p_chunk->i_sample_count - p_chunk->i_sample + 1;
i_max_samples = __MIN( i_max_samples, QT_V0_MAX_SAMPLES );
/* Group audio packets so we don't call demux for single sample unit */
if( p_track->fmt.i_original_fourcc == VLC_CODEC_DVD_LPCM &&
p_soun->i_constLPCMframesperaudiopacket &&
p_soun->i_constbytesperaudiopacket )
{
/* uncompressed case */
uint32_t i_packets = i_max_samples / p_soun->i_constLPCMframesperaudiopacket;
if ( UINT32_MAX / p_soun->i_constbytesperaudiopacket < i_packets )
i_packets = UINT32_MAX / p_soun->i_constbytesperaudiopacket;
*pi_nb_samples = i_packets * p_soun->i_constLPCMframesperaudiopacket;
return i_packets * p_soun->i_constbytesperaudiopacket;
}
/* all samples have a different size */
if( p_track->i_sample_size == 0 )
{
*pi_nb_samples = 1;
return p_track->p_sample_size[p_track->i_sample];
}
if( p_soun->i_qt_version == 1 )
{
if ( p_soun->i_compressionid != 0 )
{
/* in this case we are dealing with compressed data
-2 in V1: additional fields are meaningless (VBR and such) */
i_size = p_track->i_sample_size;
*pi_nb_samples = 1;
}
else /* uncompressed case */
{
uint32_t i_packets;
if( p_track->fmt.audio.i_blockalign > 1 )
i_packets = 1;
else
i_packets = i_max_samples / p_soun->i_sample_per_packet;
if ( UINT32_MAX / p_soun->i_bytes_per_frame < i_packets )
i_packets = UINT32_MAX / p_soun->i_bytes_per_frame;
*pi_nb_samples = i_packets * p_soun->i_sample_per_packet;
i_size = i_packets * p_soun->i_bytes_per_frame;
}
}
/* uncompressed */
*pi_nb_samples = 0;
mtime_t i_length = CLOCK_FREQ / 10;
for( uint32_t i=p_track->i_sample; i<p_chunk->i_sample_count; i++ )
{
i_length -= CLOCK_FREQ * p_chunk->p_sample_delta_dts[i] / p_track->i_timescale;
if ( i_length < 0 ) break;
i_maxsamples++;
if ( i_length < 0 || *pi_nb_samples == QT_V0_MAX_SAMPLES )
break;
(*pi_nb_samples)++;
if ( p_track->i_sample_size == 0 )
i_size += p_track->p_sample_size[i];
else
i_size += p_track->i_sample_size;
}
i_samples = __MIN( QT_V0_MAX_SAMPLES, i_samples );
i_samples = __MIN( i_maxsamples, i_samples );
if ( i_samples == 0 ) i_samples = 1;
i_size = i_samples * p_track->i_sample_size;
*pi_nb_samples = i_samples;
}
//fprintf( stderr, "size=%d\n", i_size );
......@@ -3442,45 +3468,14 @@ static uint64_t MP4_TrackGetPos( mp4_track_t *p_track )
static int MP4_TrackNextSample( demux_t *p_demux, mp4_track_t *p_track, uint32_t i_samples )
{
if( p_track->fmt.i_cat == AUDIO_ES && p_track->i_sample_size != 0 )
if ( UINT32_MAX - p_track->i_sample < i_samples )
{
MP4_Box_data_sample_soun_t *p_soun;
p_soun = p_track->p_sample->data.p_sample_soun;
if( p_soun->i_qt_version == 1 )
{
/* we read chunk by chunk unless a blockalign is requested */
if( p_track->fmt.audio.i_blockalign > 1 )
p_track->i_sample += p_soun->i_sample_per_packet;
else
p_track->i_sample += p_track->chunk[p_track->i_chunk].i_sample_count;
}
else if( p_track->i_sample_size > 256 )
{
/* We do that so we don't read too much data
* (in this case we are likely dealing with compressed data) */
p_track->i_sample += 1;
}
else
{
/* FIXME */
p_track->i_sample += i_samples;
if( p_track->i_sample >
p_track->chunk[p_track->i_chunk].i_sample_first +
p_track->chunk[p_track->i_chunk].i_sample_count )
{
p_track->i_sample =
p_track->chunk[p_track->i_chunk].i_sample_first +
p_track->chunk[p_track->i_chunk].i_sample_count;
}
}
}
else
{
p_track->i_sample++;
p_track->i_sample = UINT32_MAX;
return VLC_EGENERIC;
}
p_track->i_sample += i_samples;
if( p_track->i_sample >= p_track->i_sample_count )
return VLC_EGENERIC;
......
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