[vlc-devel] [PATCH 4/5] demux/mp4: Add fragmented MP4 support
Frédéric Yhuel
fyhuel at viotech.net
Tue May 22 17:11:11 CEST 2012
TODO: add support for (DASH) multiplexed content
(only video track is played for now).
Test it:
***** DASH *****
- http://www-itec.uni-klu.ac.at/ftp/datasets/mmsys12/ElephantsDream/MPDs/ElephantsDream_15s_isoffmain_DIS_23009_1_v_2_1c2_2011_08_30.mpd
(you must set "#define SEEK 1" in dash.cpp)
***** Smooth Streaming *****
See Smooth Streaming patch message
---
modules/demux/mp4/libmp4.h | 1 +
modules/demux/mp4/mp4.c | 822 ++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 802 insertions(+), 21 deletions(-)
diff --git a/modules/demux/mp4/libmp4.h b/modules/demux/mp4/libmp4.h
index 0775b2a..ace0b38 100644
--- a/modules/demux/mp4/libmp4.h
+++ b/modules/demux/mp4/libmp4.h
@@ -1329,6 +1329,7 @@ typedef struct
bool b_drms;
bool b_end_of_chunk;
+ bool b_adaption;
void *p_drms;
MP4_Box_t *p_skcr;
diff --git a/modules/demux/mp4/mp4.c b/modules/demux/mp4/mp4.c
index 3f7c7cb..34671c1 100644
--- a/modules/demux/mp4/mp4.c
+++ b/modules/demux/mp4/mp4.c
@@ -35,6 +35,8 @@
#include <vlc_charset.h> /* EnsureUTF8 */
#include <vlc_meta.h> /* vlc_meta_t, vlc_meta_ */
#include <vlc_input.h>
+#include <assert.h>
+#include <vlc_modules.h>
#include "libmp4.h"
#include "id3genres.h" /* for ATOM_gnre */
@@ -59,6 +61,7 @@ vlc_module_end ()
*****************************************************************************/
static int Demux ( demux_t * );
static int DemuxRef( demux_t *p_demux ){ (void)p_demux; return 0;}
+static int DemuxFrg( demux_t * );
static int Seek ( demux_t *, mtime_t );
static int Control ( demux_t *, int, va_list );
@@ -76,6 +79,10 @@ struct demux_sys_t
mp4_track_t *track; /* array of track */
float f_fps; /* number of frame per seconds */
+ bool b_smooth; /* Smooth Streaming => no moov box */
+ bool b_dash; /* DASH */
+ bool b_fragmented; /* fMP4 */
+
/* */
MP4_Box_t *p_tref_chap;
@@ -87,6 +94,7 @@ struct demux_sys_t
* Declaration of local function
*****************************************************************************/
static void MP4_TrackCreate ( demux_t *, mp4_track_t *, MP4_Box_t *, bool b_force_enable );
+static int sms_TrackCreate( demux_t *, mp4_track_t *, MP4_Box_t *);
static void MP4_TrackDestroy( mp4_track_t * );
static int MP4_TrackSelect ( demux_t *, mp4_track_t *, mtime_t );
@@ -105,9 +113,20 @@ static const char *MP4_ConvertMacCode( uint16_t );
/* Return time in s of a track */
static inline int64_t MP4_TrackGetDTS( demux_t *p_demux, mp4_track_t *p_track )
{
-#define chunk p_track->chunk[p_track->i_chunk]
+ demux_sys_t *p_sys = p_demux->p_sys;
+ mp4_chunk_t chunk;
+ if( p_sys->b_fragmented )
+ chunk = *p_track->cchunk;
+ else
+ chunk = p_track->chunk[p_track->i_chunk];
unsigned int i_index = 0;
+ if( p_track->i_sample < chunk.i_sample_first )
+ {
+ msg_Err( p_demux, "tk->i_sample is %u and ck->i_sample_first is %u",
+ p_track->i_sample, chunk.i_sample_first );
+ }
+ assert( p_track->i_sample >= chunk.i_sample_first );
unsigned int i_sample = p_track->i_sample - chunk.i_sample_first;
int64_t i_dts = chunk.i_first_dts;
@@ -127,8 +146,6 @@ static inline int64_t MP4_TrackGetDTS( demux_t *p_demux, mp4_track_t *p_track )
}
}
-#undef chunk
-
/* now handle elst */
if( p_track->p_elst )
{
@@ -153,9 +170,15 @@ static inline int64_t MP4_TrackGetDTS( demux_t *p_demux, mp4_track_t *p_track )
return INT64_C(1000000) * i_dts / p_track->i_timescale;
}
-static inline int64_t MP4_TrackGetPTSDelta( mp4_track_t *p_track )
+static inline int64_t MP4_TrackGetPTSDelta( demux_t *p_demux, mp4_track_t *p_track )
{
- mp4_chunk_t *ck = &p_track->chunk[p_track->i_chunk];
+ demux_sys_t *p_sys = p_demux->p_sys;
+ mp4_chunk_t *ck;
+ if( p_sys->b_fragmented )
+ ck = p_track->cchunk;
+ else
+ ck = &p_track->chunk[p_track->i_chunk];
+
unsigned int i_index = 0;
unsigned int i_sample = p_track->i_sample - ck->i_sample_first;
@@ -179,6 +202,7 @@ static inline int64_t MP4_GetMoviePTS(demux_sys_t *p_sys )
static void LoadChapter( demux_t *p_demux );
+
/*****************************************************************************
* Open: check file and initializes MP4 structures
*****************************************************************************/
@@ -212,6 +236,7 @@ static int Open( vlc_object_t * p_this )
case ATOM_free:
case ATOM_skip:
case ATOM_wide:
+ case ATOM_uuid:
case VLC_FOURCC( 'p', 'n', 'o', 't' ):
break;
default:
@@ -219,7 +244,7 @@ static int Open( vlc_object_t * p_this )
}
/* I need to seek */
- stream_Control( p_demux->s, STREAM_CAN_FASTSEEK, &b_seekable );
+ stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_seekable );
if( !b_seekable )
{
msg_Warn( p_demux, "MP4 plugin discarded (not fastseekable)" );
@@ -233,11 +258,70 @@ static int Open( vlc_object_t * p_this )
/* create our structure that will contains all data */
p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
- /* Now load all boxes ( except raw data ) */
- if( ( p_sys->p_root = MP4_BoxGetRoot( p_demux->s ) ) == NULL )
+ /* Is it smooth streaming or DASH ? */
+ char *parent_name = NULL;
+ if( p_demux->s->p_source && p_demux->s->p_source->p_module )
+ parent_name = (char *)module_get_name( p_demux->s->p_source->p_module, false );
+ if( parent_name && !strcmp( parent_name, "Smooth Streaming" ) )
{
- msg_Warn( p_demux, "MP4 plugin discarded (not a valid file)" );
- goto error;
+ p_sys->b_smooth = true;
+ p_sys->b_fragmented = true;
+ }
+ if( parent_name && !strcmp( parent_name, "DASH" ) )
+ {
+ p_sys->b_dash = true;
+ p_sys->b_fragmented = true;
+ }
+ if( p_sys->b_fragmented )
+ p_demux->pf_demux = DemuxFrg;
+
+ if( p_sys->b_dash )
+ {
+ /* Now load init segment */
+ if( ( p_sys->p_root = MP4_BoxGetInitFrag( p_demux->s ) ) == NULL )
+ {
+ msg_Warn( p_demux,
+ "MP4 plugin discarded (not a valid initilization fragment)" );
+ goto error;
+ }
+ }
+ else if( p_sys->b_smooth )
+ {
+ /* Now load init segment */
+ if( ( p_sys->p_root = MP4_BoxGetSmooBox( p_demux->s ) ) == NULL )
+ {
+ msg_Warn( p_demux,
+ "MP4 plugin discarded (not a valid 'smoo' box)" );
+ goto error;
+ }
+ else
+ {
+ MP4_Box_t *p_smoo = MP4_BoxGet( p_sys->p_root, "uuid" );
+ if( !p_smoo || CmpUUID( &p_smoo->i_uuid, &SmooBoxUUID ) )
+ goto error;
+ /* Get number of tracks */
+ p_sys->i_tracks = 0;
+ for( int i = 0; i < 3; i++ )
+ {
+ MP4_Box_t *p_stra = MP4_BoxGet( p_smoo, "uuid[%d]", i );
+ if( p_stra && p_stra->data.p_stra->i_track_ID )
+ p_sys->i_tracks++;
+ /* Get timescale of the video track; */
+ if( i == 0 )
+ p_sys->i_timescale = p_stra->data.p_stra->i_timescale;
+ }
+
+ goto allocate_memory;
+ }
+ }
+ else
+ {
+ /* Now load all boxes ( except raw data ) */
+ if( ( p_sys->p_root = MP4_BoxGetRoot( p_demux->s ) ) == NULL )
+ {
+ msg_Warn( p_demux, "MP4 plugin discarded (not a valid file)" );
+ goto error;
+ }
}
MP4_BoxDumpStructure( p_demux->s, p_sys->p_root );
@@ -288,13 +372,8 @@ static int Open( vlc_object_t * p_this )
if( !p_foov )
{
- /* search also for moof box used by smoothstreaming */
- p_foov = MP4_BoxGet( p_sys->p_root, "/moof" );
- if( !p_foov )
- {
- msg_Err( p_demux, "MP4 plugin discarded (no moov,foov,moof box)" );
- goto error;
- }
+ msg_Err( p_demux, "MP4 plugin discarded (no moov,foov,moof box)" );
+ goto error;
}
/* we have a free box as a moov, rename it */
p_foov->i_type = ATOM_moov;
@@ -411,10 +490,42 @@ static int Open( vlc_object_t * p_this )
p_sys->i_tracks,
p_sys->i_tracks ? 's':' ' );
+allocate_memory:
/* allocate memory */
p_sys->track = calloc( p_sys->i_tracks, sizeof( mp4_track_t ) );
if( p_sys->track == NULL )
goto error;
+ if( p_sys->b_fragmented )
+ {
+ mp4_track_t *p_track;
+ for( uint16_t i = 0; i < p_sys->i_tracks; i++ )
+ {
+ p_track = &p_sys->track[i];
+ p_track->cchunk = calloc( 1, sizeof( mp4_chunk_t ) );
+ }
+ }
+
+ if( p_sys->b_smooth )
+ {
+ /*track create */
+ MP4_Box_t *p_smoo = MP4_BoxGet( p_sys->p_root, "uuid" );
+ mp4_track_t *p_track;
+ int j = 0;
+ for( int i = 0; i < 3; i++ )
+ {
+ MP4_Box_t *p_stra = MP4_BoxGet( p_smoo, "uuid[%d]", i );
+ if( !p_stra || p_stra->data.p_stra->i_track_ID == 0 )
+ continue;
+ else
+ {
+ p_track = &p_sys->track[j]; j++;
+ p_track->b_end_of_chunk = true;
+ sms_TrackCreate( p_demux, p_track, p_stra );
+ p_track->p_es = es_out_Add( p_demux->out, &p_track->fmt );
+ }
+ }
+ return VLC_SUCCESS;
+ }
/* Search the first chap reference (like quicktime) and
* check that at least 1 stream is enabled */
@@ -439,6 +550,7 @@ static int Open( vlc_object_t * p_this )
{
p_trak = MP4_BoxGet( p_sys->p_root, "/moov/trak[%d]", i );
MP4_TrackCreate( p_demux, &p_sys->track[i], p_trak, !b_enabled_es );
+ p_sys->track[i].b_end_of_chunk = true;
if( p_sys->track[i].b_ok && !p_sys->track[i].b_chapter )
{
@@ -636,7 +748,7 @@ static int Demux( demux_t *p_demux )
/* dts */
p_block->i_dts = VLC_TS_0 + MP4_TrackGetDTS( p_demux, tk );
/* pts */
- i_delta = MP4_TrackGetPTSDelta( tk );
+ i_delta = MP4_TrackGetPTSDelta( p_demux, tk );
if( i_delta != -1 )
p_block->i_pts = p_block->i_dts + i_delta;
else if( tk->fmt.i_cat != VIDEO_ES )
@@ -999,7 +1111,7 @@ static void LoadChapterApple( demux_t *p_demux, mp4_track_t *tk )
for( tk->i_sample = 0; tk->i_sample < tk->i_sample_count; tk->i_sample++ )
{
const int64_t i_dts = MP4_TrackGetDTS( p_demux, tk );
- const int64_t i_pts_delta = MP4_TrackGetPTSDelta( tk );
+ const int64_t i_pts_delta = MP4_TrackGetPTSDelta( p_demux, tk );
const unsigned int i_size = MP4_TrackSampleSize( tk );
if( i_size > 0 && !stream_Seek( p_demux->s, MP4_TrackGetPos( tk ) ) )
@@ -1071,6 +1183,10 @@ static void LoadChapter( demux_t *p_demux )
static int TrackCreateChunksIndex( demux_t *p_demux,
mp4_track_t *p_demux_track )
{
+ demux_sys_t *p_sys = p_demux->p_sys;
+ if( p_sys->b_fragmented )
+ return VLC_SUCCESS;
+
MP4_Box_t *p_co64; /* give offset for each chunk, same for stco and co64 */
MP4_Box_t *p_stsc;
@@ -1158,6 +1274,10 @@ static int TrackCreateChunksIndex( demux_t *p_demux,
static int TrackCreateSamplesIndex( demux_t *p_demux,
mp4_track_t *p_demux_track )
{
+ demux_sys_t *p_sys = p_demux->p_sys;
+ if( p_sys->b_fragmented )
+ return VLC_SUCCESS;
+
MP4_Box_t *p_box;
MP4_Box_data_stsz_t *stsz;
MP4_Box_data_stts_t *stts;
@@ -1407,8 +1527,15 @@ static void TrackGetESSampleRate( unsigned *pi_num, unsigned *pi_den,
static int TrackCreateES( demux_t *p_demux, mp4_track_t *p_track,
unsigned int i_chunk, es_out_id_t **pp_es )
{
- const unsigned i_sample_description_index =
- p_track->chunk[i_chunk].i_sample_description_index;
+ demux_sys_t *p_sys = p_demux->p_sys;
+ unsigned int i_sample_description_index;
+
+ if( p_sys->b_fragmented )
+ i_sample_description_index = 1; /* XXX */
+ else
+ i_sample_description_index =
+ p_track->chunk[i_chunk].i_sample_description_index;
+
MP4_Box_t *p_sample;
MP4_Box_t *p_esds;
MP4_Box_t *p_frma;
@@ -1485,12 +1612,15 @@ static int TrackCreateES( demux_t *p_demux, mp4_track_t *p_track,
p_track->fmt.video.i_visible_width = p_track->fmt.video.i_width;
p_track->fmt.video.i_visible_height = p_track->fmt.video.i_height;
+ /* TODO: Set frame rate for DASH and Smooth Streaming */
+ if( !p_sys->b_fragmented ) {
/* Frame rate */
TrackGetESSampleRate( &p_track->fmt.video.i_frame_rate,
&p_track->fmt.video.i_frame_rate_base,
p_track, i_sample_description_index, i_chunk );
p_demux->p_sys->f_fps = (float)p_track->fmt.video.i_frame_rate /
(float)p_track->fmt.video.i_frame_rate_base;
+ }
/* Rotation */
switch( (int)p_track->f_rotation ) {
@@ -2680,6 +2810,7 @@ static int MP4_TrackNextSample( demux_t *p_demux, mp4_track_t *p_track )
return VLC_EGENERIC;
/* Have we changed chunk ? */
+
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 )
@@ -2798,3 +2929,652 @@ static const char *MP4_ConvertMacCode( uint16_t i_code )
}
return "";
}
+
+/******************************************************************************
+ * Here are the functions used for fragmented MP4
+ *****************************************************************************/
+
+static int hex_digit( char c )
+{
+ if (c >= 'A' && c <= 'F')
+ return c - 'A' + 10;
+ else if (c >= 'a' && c <= 'f')
+ return c - 'a' + 10;
+ else if (c >= '0' && c<= '9')
+ return c - '0';
+ else
+ return -1;
+}
+
+static uint8_t *decode_string_hex_to_binary( const char *psz_src )
+{
+ int i = 0, j = 0, first_digit, second_digit;
+ int i_len = strlen( psz_src );
+ uint8_t *p_data = malloc ( i_len / 2 );
+
+ if( !p_data )
+ return NULL;
+
+ while( i < i_len )
+ {
+ first_digit = hex_digit( psz_src[i++] );
+ second_digit = hex_digit( psz_src[i++] );
+ p_data[j++] = ( first_digit << 4 ) | second_digit;
+ }
+
+ return p_data;
+}
+
+/* Build raw avcC box (without the 8 bytes header) and return its size */
+static int build_raw_avcC( uint8_t **p_extra, const char *CodecPrivateData )
+{
+ uint8_t *avcC;
+ const char *mark = "00000001";
+ char head[9];
+ char *pos;
+ char tmp[512];
+ char sps_nal_unit[512], pps_nal_unit[512];
+
+ strncpy( head, CodecPrivateData, 8 );
+ head[8] = '\0';
+ assert( !strcmp( head, mark ) );
+ strncpy( tmp, CodecPrivateData + 8, 511 );
+ tmp[511] = '\0';
+ pos = strstr( tmp, mark );
+ if( pos == NULL )
+ return 0;
+ strncpy( pps_nal_unit, pos + 8, 511 );
+ pps_nal_unit[511] = '\0';
+ size_t len = (size_t)(pos - tmp);
+ assert( len < 512 );
+ strncpy( sps_nal_unit, tmp, len );
+ sps_nal_unit[len] = '\0';
+ uint8_t *sps = decode_string_hex_to_binary( sps_nal_unit );
+ uint8_t *pps = decode_string_hex_to_binary( pps_nal_unit );
+
+ uint32_t length = 8 + (strlen( CodecPrivateData ) - 16) / 2 + 11;
+ avcC = calloc( length, 1 );
+ if( unlikely( avcC == NULL ) )
+ return 0;
+
+ /* XXX */
+ uint8_t AVCProfileIndication = 0x64;
+ uint8_t profile_compatibility = 0x40;
+ uint8_t AVCLevelIndication = 0x1f;
+ uint8_t lengthSizeMinusOne = 0x03;
+
+ int sps_len = strlen( sps_nal_unit ) / 2;
+ int pps_len = strlen( pps_nal_unit ) / 2;
+
+ avcC[0] = 1;
+ avcC[1] = AVCProfileIndication;
+ avcC[2] = profile_compatibility;
+ avcC[3] = AVCLevelIndication;
+ avcC[4] = 0xfc + lengthSizeMinusOne;
+ avcC[5] = 0xe0 + 1;
+ avcC[6] = (sps_len & 0xff00)>>8;
+ avcC[7] = sps_len & 0xff;
+ memcpy( avcC+8, sps, sps_len );
+
+ avcC[8+sps_len] = 1;
+ avcC[9+sps_len] = (pps_len & 0xff00) >> 8;
+ avcC[10+sps_len] = pps_len & 0xff;
+ memcpy( avcC + 11 + sps_len, pps, pps_len );
+
+ *p_extra = avcC;
+ return length;
+}
+
+/* Build part of esds box (actually just the CodecPrivateData),
+ * and return its size */
+static int build_raw_esds( uint8_t **p_extra, const char *CodecPrivateData )
+{
+ uint8_t *esds;
+ uint8_t *codec_data = decode_string_hex_to_binary( CodecPrivateData );
+ size_t codec_data_length = strlen( CodecPrivateData ) / 2;
+ esds = calloc( 1, codec_data_length );
+ if( unlikely( esds == NULL ) )
+ return 0;
+
+ memcpy( esds, codec_data, codec_data_length );
+
+ *p_extra = esds;
+ return codec_data_length;
+}
+
+/* Build a mp4_track_t from a StraBox */
+static int sms_TrackCreate( demux_t *p_demux, mp4_track_t *p_track, MP4_Box_t *p_stra )
+{
+ demux_sys_t *p_sys = p_demux->p_sys;
+ MP4_Box_data_stra_t *p_data = p_stra->data.p_stra;
+
+ p_track->b_ok = true;
+ p_track->b_selected = false;
+ p_track->i_sample_count = UINT32_MAX;
+
+ p_track->i_timescale = p_sys->i_timescale;
+ p_track->i_width = p_data->MaxWidth;
+ p_track->i_height = p_data->MaxHeight;
+ p_track->i_track_ID = p_data->i_track_ID;
+
+ es_format_t *fmt = &p_track->fmt;
+
+ es_format_Init( fmt, p_data->i_es_cat, 0 );
+
+ /* Set language FIXME */
+ fmt->psz_language = strdup( "en" );
+
+ switch( fmt->i_cat )
+ {
+ case VIDEO_ES:
+ if( p_data->FourCC == VLC_FOURCC( 'A', 'V', 'C', '1' ) ||
+ p_data->FourCC == VLC_FOURCC( 'H', '2', '6', '4' ) )
+ {
+ fmt->i_extra = build_raw_avcC( (uint8_t **)&fmt->p_extra,
+ p_data->CodecPrivateData );
+ fmt->i_codec = VLC_CODEC_H264;
+ }
+ else
+ {
+ fmt->i_extra = build_raw_esds( (uint8_t **)&fmt->p_extra,
+ p_data->CodecPrivateData );
+ fmt->i_codec = p_data->FourCC;
+ }
+
+ fmt->video.i_width = p_data->MaxWidth;
+ fmt->video.i_height = p_data->MaxHeight;
+ fmt->video.i_bits_per_pixel = 0x18;
+ fmt->video.i_visible_width = p_data->MaxWidth;
+ fmt->video.i_visible_height = p_data->MaxHeight;
+ break;
+
+ case AUDIO_ES:
+ fmt->i_extra = build_raw_esds( (uint8_t **)&fmt->p_extra,
+ p_data->CodecPrivateData );
+ if( p_data->FourCC == VLC_FOURCC( 'A', 'A', 'C', 'H' ) ||
+ p_data->FourCC == VLC_FOURCC( 'A', 'A', 'C', 'L' ) )
+ fmt->i_codec = VLC_CODEC_MP4A;
+
+ /* disable WMAP for now (doesn't work) */
+ else if( p_data->FourCC == VLC_FOURCC( 'W', 'M', 'A', 'P' ) )
+ fmt->i_codec = 0;
+ else
+ fmt->i_codec = p_data->FourCC;
+
+ fmt->audio.i_channels = p_data->Channels;
+ fmt->audio.i_rate = p_data->SamplingRate;
+ fmt->audio.i_bitspersample = p_data->BitsPerSample;
+ break;
+
+ default:
+ break;
+ }
+
+ return VLC_SUCCESS;
+}
+
+static mp4_track_t *fMP4_GetTrack( demux_t *p_demux, uint16_t tid )
+{
+ demux_sys_t *p_sys = p_demux->p_sys;
+
+ mp4_track_t *ret = NULL;
+ for( unsigned i = 0; i < p_sys->i_tracks; i++ )
+ {
+ ret = &p_sys->track[i];
+ if( ret->i_track_ID == tid )
+ break;
+ if( i == p_sys->i_tracks - 1 )
+ {
+ msg_Err( p_demux, "fMP4_GetTrack: track %"PRIu16" not found!", tid );
+ return NULL;
+ }
+ }
+ return ret;
+}
+
+static int FreeChunk( mp4_chunk_t *ck )
+{
+ free( ck->p_sample_count_dts );
+ free( ck->p_sample_delta_dts );
+ free( ck->p_sample_count_pts );
+ free( ck->p_sample_offset_pts );
+ free( ck->p_sample_size );
+ for( uint32_t i = 0; i < ck->i_sample_count; i++ )
+ free( ck->p_sample_data[i] );
+ free( ck->p_sample_data );
+ memset( ck, 0, sizeof( mp4_chunk_t ) );
+ return VLC_SUCCESS;
+}
+
+static void FlushChunk( demux_t *p_demux, mp4_track_t *tk, mp4_chunk_t *ck )
+{
+ msg_Dbg( p_demux, "Flushing chunk" );
+ while( ck->i_sample < ck->i_sample_count )
+ {
+ block_t *p_block;
+ int64_t i_delta;
+
+ uint32_t sample_size = ck->p_sample_size[ck->i_sample];
+ assert( sample_size > 0 );
+ p_block = block_Alloc( sample_size );
+ if( unlikely( !p_block ) )
+ return;
+ uint8_t *src = ck->p_sample_data[ck->i_sample];
+ memcpy( p_block->p_buffer, src, sample_size );
+ ck->i_sample++;
+
+ /* dts */
+ p_block->i_dts = VLC_TS_0 + MP4_TrackGetDTS( p_demux, tk );
+ /* pts */
+ i_delta = MP4_TrackGetPTSDelta( p_demux, tk );
+ if( i_delta != -1 )
+ p_block->i_pts = p_block->i_dts + i_delta;
+ else if( tk->fmt.i_cat != VIDEO_ES )
+ p_block->i_pts = p_block->i_dts;
+ else
+ p_block->i_pts = VLC_TS_INVALID;
+
+ es_out_Send( p_demux->out, tk->p_es, p_block );
+
+ tk->i_sample++;
+ }
+}
+
+/* This function fills a mp4_chunk_t structure from a MP4_Box_t (p_chunk).
+ * p_chunk usually contains a 'moof' and a 'mdat', and might contain a 'sidx'.
+ * The 'i_tk_id' argument returns the ID of the track the chunk belongs to.
+ */
+static int fMP4_GetChunk( demux_t *p_demux, MP4_Box_t *p_chunk, unsigned *i_tk_id )
+{
+ demux_sys_t *p_sys = p_demux->p_sys;
+ MP4_Box_t *p_sidx = MP4_BoxGet( p_chunk, "sidx" );
+ MP4_Box_t *p_moof = MP4_BoxGet( p_chunk, "moof" );
+ if( p_moof == NULL)
+ {
+ msg_Warn( p_demux, "no moof box found!" );
+ return VLC_EGENERIC;
+ }
+
+ /* There is only one traf per moof in un-multiplexed fMP4 */
+ MP4_Box_t *p_traf = MP4_BoxGet( p_moof, "traf" );
+ if( p_traf == NULL)
+ {
+ msg_Warn( p_demux, "no traf box found!" );
+ return VLC_EGENERIC;
+ }
+ MP4_Box_t *p_tfhd = MP4_BoxGet( p_traf, "tfhd" );
+ if( p_tfhd == NULL)
+ {
+ msg_Warn( p_demux, "no tfhd box found!" );
+ return VLC_EGENERIC;
+ }
+ uint32_t i_track_ID = p_tfhd->data.p_tfhd->i_track_ID;
+ *i_tk_id = i_track_ID;
+ assert( i_track_ID > 0 );
+ msg_Dbg( p_demux, "GetChunk: track ID is %"PRIu32"", i_track_ID );
+ mp4_track_t *p_track = fMP4_GetTrack( p_demux, i_track_ID );
+ if( !p_track )
+ return VLC_EGENERIC;
+ mp4_chunk_t *ret = p_track->cchunk;
+
+ if( p_tfhd->data.p_tfhd->b_empty )
+ {
+ /* XXX Don't know what to do in this case actually */
+ msg_Warn( p_demux, "No samples in this chunk!" );
+ }
+
+ if( ret->i_sample < ret->i_sample_count )
+ FlushChunk( p_demux, p_track, ret );
+ if( ret->i_sample_count )
+ FreeChunk( ret );
+
+ uint32_t default_duration = 0;
+ if( p_tfhd->data.p_tfhd->i_flags & MP4_TFHD_DFLT_SAMPLE_DURATION )
+ default_duration = p_tfhd->data.p_tfhd->i_default_sample_duration;
+
+ uint32_t default_size = 0;
+ if( p_tfhd->data.p_tfhd->i_flags & MP4_TFHD_DFLT_SAMPLE_SIZE )
+ default_size = p_tfhd->data.p_tfhd->i_default_sample_size;
+
+ MP4_Box_t *p_trun = MP4_BoxGet( p_traf, "trun");
+ if( p_trun == NULL)
+ {
+ msg_Warn( p_demux, "no trun box found!" );
+ return VLC_EGENERIC;
+ }
+ MP4_Box_data_trun_t *p_trun_data = p_trun->data.p_trun;
+
+ ret->i_sample_count = p_trun_data->i_sample_count;
+ assert( ret->i_sample_count > 0 );
+ ret->i_sample_description_index = 1; /* seems to be always 1, is it? */
+ ret->i_sample_first = p_track->i_sample_first;
+ p_track->i_sample_first += ret->i_sample_count;
+
+ ret->i_first_dts = p_track->i_first_dts;
+
+ /* temporary hack for DASH */
+ if( p_sys->b_dash && !default_duration )
+ {
+ if( p_sidx )
+ {
+ MP4_Box_data_sidx_t *p_sidx_data = p_sidx->data.p_sidx;
+ assert( p_sidx_data->i_reference_count == 1 );
+ unsigned i_chunk_duration = p_sidx_data->p_items[0].i_subsegment_duration /
+ p_sidx_data->i_timescale;
+ default_duration = i_chunk_duration *
+ p_track->i_timescale / ret->i_sample_count;
+ }
+#define DASH_FRAG_DURATION 4
+ /* you may edit this value (look at the MPD for segment duration */
+ else
+ {
+ default_duration = DASH_FRAG_DURATION *
+ p_track->i_timescale / ret->i_sample_count;
+ }
+ }
+#undef DASH_FRAG_DURATION
+
+ msg_Dbg( p_demux, "Default sample duration is %"PRIu32, default_duration );
+
+ ret->p_sample_count_dts = calloc( ret->i_sample_count, sizeof( uint32_t ) );
+ ret->p_sample_delta_dts = calloc( ret->i_sample_count, sizeof( uint32_t ) );
+
+ if( !ret->p_sample_count_dts || !ret->p_sample_delta_dts )
+ return VLC_ENOMEM;
+
+ ret->p_sample_count_pts = calloc( ret->i_sample_count, sizeof( uint32_t ) );
+ ret->p_sample_offset_pts = calloc( ret->i_sample_count, sizeof( int32_t ) );
+
+ if( !ret->p_sample_count_pts || !ret->p_sample_offset_pts )
+ return VLC_ENOMEM;
+
+ ret->p_sample_size = calloc( ret->i_sample_count, sizeof( uint32_t ) );
+ if( !ret->p_sample_size )
+ return VLC_ENOMEM;
+
+ ret->p_sample_data = calloc( ret->i_sample_count, sizeof( uint8_t * ) );
+ if( !ret->p_sample_data )
+ return VLC_ENOMEM;
+
+ uint32_t dur = 0, len;
+ uint32_t chunk_duration = 0, chunk_size = 0;
+
+ /* Skip header of mdat (this is not really clean) */
+ stream_Read( p_demux->s, NULL, 8 );
+
+ for( uint32_t i = 0; i < ret->i_sample_count; i++)
+ {
+ if( p_trun_data->i_flags & MP4_TRUN_SAMPLE_DURATION )
+ dur = p_trun_data->p_samples[i].i_duration;
+ else
+ dur = default_duration;
+ ret->p_sample_delta_dts[i] = dur;
+ chunk_duration += dur;
+ ret->p_sample_count_dts[i] = 1;
+ ret->p_sample_count_pts[i] = 1;
+ if( p_trun_data->i_flags & MP4_TRUN_SAMPLE_TIME_OFFSET )
+ ret->p_sample_offset_pts[i] =
+ p_trun_data->p_samples[i].i_composition_time_offset;
+ else
+ ret->p_sample_offset_pts[i] = 0;
+ if( p_trun_data->i_flags & MP4_TRUN_SAMPLE_SIZE )
+ len = ret->p_sample_size[i] = p_trun_data->p_samples[i].i_size;
+ else
+ len = ret->p_sample_size[i] = default_size;
+ ret->p_sample_data[i] = malloc( len );
+ int read = stream_Read( p_demux->s, ret->p_sample_data[i], len );
+ if( read < (int)len )
+ return VLC_EGENERIC;
+ else
+ msg_Dbg( p_demux, "GetChunk: read a sample of size %"PRIu32"", len );
+ chunk_size += len;
+ }
+ ret->i_last_dts = chunk_duration - dur;
+ p_track->i_first_dts = chunk_duration + ret->i_first_dts;
+
+ /* Warning! If we do a es_out_Del / es_out_Add too soon,
+ * before the track has been selected by MP4_TrackSelect
+ * (during the first execution of Demux), then the track gets disabled */
+ uint32_t i_sample = 0;
+ MP4_Box_t *p_stra = NULL, *p_trak = NULL;
+ if( p_track->b_adaption && p_track->fmt.i_cat == VIDEO_ES )
+ {
+ if( p_sys->b_smooth )
+ {
+ p_stra = MP4_BoxGet( p_sys->p_root, "uuid/uuid[0]" );
+ if( !p_stra || CmpUUID( &p_stra->i_uuid, &StraBoxUUID ) )
+ return VLC_EGENERIC;
+ }
+ else /* DASH */
+ {
+ p_trak = MP4_BoxGet( p_sys->p_root, "/moov/trak[0]" );
+ if( !p_trak )
+ return VLC_EGENERIC;
+ }
+
+ i_sample = p_track->i_sample;
+ es_out_Del( p_demux->out, p_track->p_es );
+ es_format_Clean( &p_track->fmt );
+
+ if( p_sys->b_smooth )
+ sms_TrackCreate( p_demux, p_track, p_stra );
+ else /* DASH */
+ MP4_TrackCreate( p_demux, p_track, p_trak, true );
+
+ p_track->i_sample = i_sample;
+
+ /* Temporary hack until we support track selection */
+ p_track->b_selected = true;
+ p_track->b_ok = true;
+ p_track->b_enable = true;
+
+ p_track->p_es = es_out_Add( p_demux->out, &p_track->fmt );
+ p_track->b_adaption = false;
+ }
+
+ p_track->b_end_of_chunk = false;
+ return VLC_SUCCESS;
+}
+
+/* Get the next chunk of the track identified by i_tk_id.
+ * We don't want to seek all the time, so if the first chunk given by the
+ * input method doesn't belong to the right track, we don't throw it away,
+ * and so, in general, this function fetch more than one chunk.
+ * Not to mention that a new init segment might be put everywhere
+ * between two chunks by the input method. */
+static int fMP4_GetChunks( demux_t *p_demux, unsigned i_tk_id )
+{
+ demux_sys_t *p_sys = p_demux->p_sys;
+ unsigned tid;
+ mp4_track_t *p_track;
+
+ for( unsigned i = 0; i < p_sys->i_tracks; i++ )
+ {
+ MP4_Box_t *p_chunk = MP4_BoxGetNextChunk( p_demux->s );
+ if( !p_chunk )
+ return VLC_EGENERIC;
+ if( p_chunk->i_type == ATOM_uuid && !CmpUUID( &p_chunk->i_uuid, &SmooBoxUUID ) )
+ {
+ free( p_sys->p_root );
+ if( ( p_sys->p_root = MP4_BoxGetSmooBox( p_demux->s ) ) == NULL )
+ {
+ msg_Warn( p_demux,
+ "MP4 plugin discarded (not a valid 'smoo' box)" );
+ return VLC_EGENERIC;
+ }
+ MP4_Box_t *p_stra = MP4_BoxGet( p_sys->p_root, "uuid/uuid[0]" );
+ if( !p_stra || CmpUUID( &p_stra->i_uuid, &StraBoxUUID ) )
+ {
+ msg_Warn( p_demux, "No StraBox found!" );
+ return VLC_EGENERIC;
+ }
+ p_track = fMP4_GetTrack( p_demux, p_stra->data.p_stra->i_track_ID );
+ p_track->b_adaption = true;
+
+ return fMP4_GetChunks( p_demux, i_tk_id );
+ }
+ else if( p_chunk->i_type == ATOM_ftyp )
+ {
+ free( p_sys->p_root );
+ if( ( p_sys->p_root = MP4_BoxGetInitFrag( p_demux->s ) ) == NULL )
+ {
+ msg_Warn( p_demux, "MP4 plugin discarded (not a valid init frag)" );
+ return VLC_EGENERIC;
+ }
+ MP4_Box_t *p_tkhd = MP4_BoxGet( p_sys->p_root, "/moov/trak[0]/tkhd" );
+ p_track = fMP4_GetTrack( p_demux, p_tkhd->data.p_tkhd->i_track_ID );
+ p_track->b_adaption = true;
+
+ return fMP4_GetChunks( p_demux, i_tk_id );
+ }
+
+ if( fMP4_GetChunk( p_demux, p_chunk, &tid ) != VLC_SUCCESS )
+ return VLC_EGENERIC;
+ if( tid == i_tk_id )
+ break;
+ }
+
+ return VLC_SUCCESS;
+}
+
+static int fMP4_TrackSelect( demux_t *p_demux, mp4_track_t *p_track )
+{
+ if( !p_track->b_ok || p_track->b_chapter )
+ {
+ return VLC_EGENERIC;
+ }
+
+ if( p_track->b_selected )
+ {
+ msg_Warn( p_demux, "track[Id 0x%x] already selected", p_track->i_track_ID );
+ return VLC_SUCCESS;
+ }
+
+ msg_Dbg( p_demux, "Select track id %u", p_track->i_track_ID );
+ p_track->b_selected = true;
+ return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * DemuxFrg: read packet and send them to decoders
+ *****************************************************************************
+ * TODO check for newly selected track
+ *****************************************************************************/
+int DemuxFrg( demux_t *p_demux )
+{
+ msg_Dbg( p_demux, "Entering DemuxFrag" );
+ demux_sys_t *p_sys = p_demux->p_sys;
+ unsigned i_track;
+ unsigned i_track_selected;
+
+ /* check for newly selected/unselected track */
+ for( i_track = 0, i_track_selected = 0; i_track < p_sys->i_tracks; i_track++ )
+ {
+ mp4_track_t *tk = &p_sys->track[i_track];
+ bool b;
+
+ if( !tk->b_ok || tk->b_chapter )
+ {
+ continue;
+ }
+
+ es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE, tk->p_es, &b );
+ msg_Dbg( p_demux, "track %u %s!", tk->i_track_ID, b ? "enabled" : "disabled" );
+
+ if( tk->b_selected && !b )
+ {
+ MP4_TrackUnselect( p_demux, tk );
+ }
+ else if( !tk->b_selected && b)
+ {
+ fMP4_TrackSelect( p_demux, tk );
+ }
+
+ if( tk->b_selected )
+ {
+ i_track_selected++;
+ }
+ }
+
+ if( i_track_selected <= 0 )
+ {
+ p_sys->i_time += __MAX( p_sys->i_timescale / 10 , 1 );
+ if( p_sys->i_timescale > 0 )
+ {
+ int64_t i_length = (mtime_t)1000000 *
+ (mtime_t)p_sys->i_duration /
+ (mtime_t)p_sys->i_timescale;
+ if( MP4_GetMoviePTS( p_sys ) >= i_length )
+ return 0;
+ return 1;
+ }
+
+ msg_Warn( p_demux, "no track selected, exiting..." );
+ return 0;
+ }
+
+ /* first wait for the good time to read a packet */
+ es_out_Control( p_demux->out, ES_OUT_SET_PCR, VLC_TS_0 + p_sys->i_pcr );
+
+ p_sys->i_pcr = MP4_GetMoviePTS( p_sys );
+
+ /* we will read 100ms for each stream so ...*/
+ p_sys->i_time += __MAX( p_sys->i_timescale / 10, 1 );
+
+ for( i_track = 0; i_track < p_sys->i_tracks; i_track++ )
+ {
+ mp4_track_t *tk = &p_sys->track[i_track];
+
+ if( !tk->b_ok || tk->b_chapter || !tk->b_selected )
+ continue;
+ if( tk->b_end_of_chunk )
+ {
+ if( fMP4_GetChunks( p_demux, tk->i_track_ID ) != VLC_SUCCESS )
+ return 0;
+ }
+
+ while( MP4_TrackGetDTS( p_demux, tk ) < MP4_GetMoviePTS( p_sys ) )
+ {
+ msg_Dbg( p_demux, "tk(%i)=%lld mv=%lld", i_track,
+ MP4_TrackGetDTS( p_demux, tk ),
+ MP4_GetMoviePTS( p_sys ) );
+ block_t *p_block;
+ int64_t i_delta;
+
+ mp4_chunk_t *ck = tk->cchunk;
+ if( ck->i_sample >= ck->i_sample_count )
+ {
+ msg_Err( p_demux, "sample %"PRIu32" of %"PRIu32"",
+ ck->i_sample, ck->i_sample_count );
+ }
+ assert( ck->i_sample < ck->i_sample_count );
+ uint32_t sample_size = ck->p_sample_size[ck->i_sample];
+ assert( sample_size > 0 );
+ p_block = block_Alloc( sample_size );
+ uint8_t *src = ck->p_sample_data[ck->i_sample];
+ memcpy( p_block->p_buffer, src, sample_size );
+ ck->i_sample++;
+ if( ck->i_sample == ck->i_sample_count )
+ tk->b_end_of_chunk = true;
+
+ /* dts */
+ p_block->i_dts = VLC_TS_0 + MP4_TrackGetDTS( p_demux, tk );
+ /* pts */
+ i_delta = MP4_TrackGetPTSDelta( p_demux, tk );
+ if( i_delta != -1 )
+ p_block->i_pts = p_block->i_dts + i_delta;
+ else if( tk->fmt.i_cat != VIDEO_ES )
+ p_block->i_pts = p_block->i_dts;
+ else
+ p_block->i_pts = VLC_TS_INVALID;
+
+ es_out_Send( p_demux->out, tk->p_es, p_block );
+
+ tk->i_sample++;
+ if( tk->b_end_of_chunk )
+ break;
+ }
+ }
+
+ return 1;
+}
--
1.7.9.5
More information about the vlc-devel
mailing list