[vlc-devel] [PATCH 3/3] demux/mp4: Add fragmented MP4 support

Frédéric Yhuel fyhuel at viotech.net
Thu May 31 15:17:52 CEST 2012


TODO: add support for 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    |  902 ++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 880 insertions(+), 23 deletions(-)

diff --git a/modules/demux/mp4/libmp4.h b/modules/demux/mp4/libmp4.h
index 973689f..c3d4a71 100644
--- a/modules/demux/mp4/libmp4.h
+++ b/modules/demux/mp4/libmp4.h
@@ -1330,6 +1330,7 @@ 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 bef1102..5c26de5 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 +79,9 @@ 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_fragmented;   /* fMP4 */
+
     /* */
     MP4_Box_t    *p_tref_chap;
 
@@ -87,6 +93,7 @@ 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 );
@@ -105,7 +112,12 @@ 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;
     unsigned int i_sample = p_track->i_sample - chunk.i_sample_first;
@@ -127,8 +139,6 @@ 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 +163,15 @@ 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 +195,104 @@ static inline int64_t MP4_GetMoviePTS(demux_sys_t *p_sys )
 
 static void LoadChapter( demux_t  *p_demux );
 
+static int LoadInitFrag( demux_t *p_demux )
+{
+    demux_sys_t *p_sys = p_demux->p_sys;
+
+    if( p_sys->b_smooth ) /* Smooth Streaming */
+    {
+        if( ( p_sys->p_root = MP4_BoxGetSmooBox( p_demux->s ) ) == NULL )
+        {
+            goto LoadInitFragError;
+        }
+        else
+        {
+            MP4_Box_t *p_smoo = MP4_BoxGet( p_sys->p_root, "uuid" );
+            if( !p_smoo || CmpUUID( &p_smoo->i_uuid, &SmooBoxUUID ) )
+                goto LoadInitFragError;
+            /* 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;
+            }
+        }
+    }
+    else if( p_sys->b_fragmented ) /* DASH */
+    {
+        /* Load moov box */
+        if( ( p_sys->p_root = MP4_BoxGetInitFrag( p_demux->s ) ) == NULL )
+        {
+            goto LoadInitFragError;
+        }
+    }
+    else
+    {
+        /* Load all boxes ( except raw data ) */
+        if( ( p_sys->p_root = MP4_BoxGetRoot( p_demux->s ) ) == NULL )
+        {
+            goto LoadInitFragError;
+        }
+    }
+    return VLC_SUCCESS;
+
+LoadInitFragError:
+    msg_Warn( p_demux, "MP4 plugin discarded (not a valid initialization chunk)" );
+    return VLC_EGENERIC;
+}
+
+static int AllocateMemory( demux_t *p_demux )
+{
+    demux_sys_t *p_sys = p_demux->p_sys;
+
+    p_sys->track = calloc( p_sys->i_tracks, sizeof( mp4_track_t ) );
+    if( p_sys->track == NULL )
+        return VLC_EGENERIC;
+
+    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( unlikely( !p_track->cchunk ) )
+            {
+                free( p_sys->track );
+                return VLC_EGENERIC;
+            }
+        }
+    }
+    return VLC_SUCCESS;
+}
+
+static void CreateTracksFromSmooBox( demux_t *p_demux )
+{
+    demux_sys_t *p_sys = p_demux->p_sys;
+
+    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 );
+        }
+    }
+}
+
 /*****************************************************************************
  * Open: check file and initializes MP4 structures
  *****************************************************************************/
@@ -211,6 +325,7 @@ 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;
         case ATOM_ftyp:
@@ -223,7 +338,7 @@ 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)" );
@@ -237,11 +352,33 @@ 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)" );
+        p_sys->b_smooth = true;
+        p_sys->b_fragmented = true;
+    }
+    else if( parent_name && !strcmp( parent_name, "DASH" ) )
+    {
+        p_sys->b_fragmented = true;
+    }
+    if( p_sys->b_fragmented )
+    {
+        p_demux->pf_demux = DemuxFrg;
+    }
+
+    if( LoadInitFrag( p_demux ) != VLC_SUCCESS )
         goto error;
+
+    if( p_sys->b_smooth )
+    {
+        if( AllocateMemory( p_demux ) != VLC_SUCCESS )
+            goto error;
+        CreateTracksFromSmooBox( p_demux );
+        return VLC_SUCCESS;
     }
 
     MP4_BoxDumpStructure( p_demux->s, p_sys->p_root );
@@ -292,13 +429,8 @@ 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;
@@ -415,9 +547,7 @@ static int Open( vlc_object_t * p_this )
                         p_sys->i_tracks,
                         p_sys->i_tracks ? 's':' ' );
 
-    /* allocate memory */
-    p_sys->track = calloc( p_sys->i_tracks, sizeof( mp4_track_t ) );
-    if( p_sys->track == NULL )
+    if( AllocateMemory( p_demux ) != VLC_SUCCESS )
         goto error;
 
     /* Search the first chap reference (like quicktime) and
@@ -443,6 +573,7 @@ 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 )
         {
@@ -640,7 +771,7 @@ 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 )
@@ -1003,7 +1134,7 @@ 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 ) ) )
@@ -1075,6 +1206,10 @@ 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;
 
@@ -1162,6 +1297,10 @@ 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;
@@ -1411,8 +1550,15 @@ 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;
@@ -1489,12 +1635,15 @@ 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 Smooth Streaming */
+        if( !p_sys->b_smooth ) {
         /* 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 ) {
@@ -2802,3 +2951,710 @@ 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)
+ * \return The size of the box.
+ */
+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).
+ * \return The size of the box.
+ */
+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 );
+    if( !codec_data )
+        return 0;
+
+    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;
+    if( !p_data )
+        return VLC_EGENERIC;
+
+    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;
+    assert( fmt != NULL );
+
+    es_format_Init( fmt, p_data->i_es_cat, 0 );
+
+    /* Set language FIXME */
+    fmt->psz_language = strdup( "en" );
+
+    uint8_t **p_extra = (uint8_t **)&fmt->p_extra;
+    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( p_extra, p_data->CodecPrivateData );
+                assert( fmt->i_extra > 0 );
+                fmt->i_codec = VLC_CODEC_H264;
+            }
+            else
+            {
+                fmt->i_extra = build_raw_esds( p_extra, p_data->CodecPrivateData );
+                assert( fmt->i_extra > 0 );
+                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( p_extra, p_data->CodecPrivateData );
+            assert( fmt->i_extra > 0 );
+            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;
+}
+
+/**
+ * Return the track identified by tid
+ */
+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 )
+            return NULL;
+        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;
+
+        if( ck->p_sample_size == NULL || ck->p_sample_data == NULL )
+            return;
+
+        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];
+        assert( src );
+        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++;
+    }
+}
+
+/**
+ * Re-init decoder.
+ * \Note If we call that function too soon,
+ * before the track has been selected by MP4_TrackSelect
+ * (during the first execution of Demux), then the track gets disabled
+ */
+static int ReInitDecoder( demux_t *p_demux, mp4_track_t *p_track )
+{
+    demux_sys_t *p_sys = p_demux->p_sys;
+
+    uint32_t i_sample = 0;
+    MP4_Box_t *p_stra = NULL, *p_trak = NULL;
+
+    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;
+
+    return VLC_SUCCESS;
+}
+
+/**
+ * This function fills a mp4_chunk_t structure from a MP4_Box_t (p_chunk).
+ * The 'i_tk_id' argument returns the ID of the track the chunk belongs to.
+ * \note p_chunk usually contains a 'moof' and a 'mdat', and might contain a 'sidx'.
+ * \return VLC_SUCCESS, VLC_EGENERIC or VLC_ENOMEM.
+ */
+static int fMP4_GetChunk( demux_t *p_demux, MP4_Box_t *p_chunk, unsigned *i_tk_id )
+{
+    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!" );
+    }
+
+    /* Usually we read 100 ms of each track. However, suppose we have two tracks,
+     * Ta and Tv (audio and video). Suppose also that Ta is the first track to be
+     * read, i.e. we read 100 ms of Ta, then 100 ms of Tv, then 100 ms of Ta,
+     * and so on. Finally, suppose that we get the chunks the other way around,
+     * i.e. first a chunk of Tv, then a chunk of Ta, then a chunk of Tv, and so on.
+     * In that case, it is very likely that at some point, Ta->cchunk or Tv->cchunk
+     * is not emptied when fMP4_GetChunks is called. It is therefore necessary to
+     * flush it, i.e. send to the decoder the samples not yet sent.
+     * Note that all the samples to be flushed should worth less than 100 ms,
+     * (though I did not do the formal proof) and thus this flushing mechanism
+     * should not cause A/V sync issues, or delays or whatever.
+     */
+    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;
+
+    /* XXX I already saw DASH content with no default_duration and no
+     * MP4_TRUN_SAMPLE_DURATION flag, but a sidx box was present.
+     * This chunk of code might be buggy with segments having
+     * more than one subsegment. */
+    if( !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;
+        }
+    }
+
+    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 */
+    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] = 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 );
+        if( ret->p_sample_data[i] == NULL )
+            return VLC_ENOMEM;
+        int read = stream_Read( p_demux->s, ret->p_sample_data[i], len );
+        if( read < (int)len )
+            return VLC_EGENERIC;
+        chunk_size += len;
+    }
+    ret->i_last_dts = chunk_duration - dur;
+    p_track->i_first_dts = chunk_duration + ret->i_first_dts;
+
+    if( p_track->b_adaption && p_track->fmt.i_cat == VIDEO_ES )
+        ReInitDecoder( p_demux, p_track );
+
+    p_track->b_end_of_chunk = false;
+    return VLC_SUCCESS;
+}
+
+/**
+ * Get the next chunk of the track identified by i_tk_id.
+ * \Note 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;
+    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;
+
+        uint32_t i_type = p_chunk->p_first->i_type;
+        uint16_t tid = 0;
+        if( i_type == ATOM_uuid || i_type == ATOM_ftyp )
+        {
+            free( p_sys->p_root );
+            p_sys->p_root = p_chunk;
+
+            if( i_type == ATOM_ftyp ) /* DASH */
+            {
+                MP4_Box_t *p_tkhd = MP4_BoxGet( p_chunk, "/moov/trak[0]/tkhd" );
+                if( !p_tkhd )
+                {
+                    msg_Warn( p_demux, "No tkhd found!" );
+                    free( p_chunk );
+                    return VLC_EGENERIC;
+                }
+                tid = p_tkhd->data.p_tkhd->i_track_ID;
+            }
+            else                      /* Smooth Streaming */
+            {
+                assert( !CmpUUID( &p_chunk->p_first->i_uuid, &SmooBoxUUID ) );
+                MP4_Box_t *p_stra = MP4_BoxGet( p_chunk, "/uuid/uuid[0]" );
+                if( !p_stra || CmpUUID( &p_stra->i_uuid, &StraBoxUUID ) )
+                {
+                    msg_Warn( p_demux, "No StraBox found!" );
+                    free( p_chunk );
+                    return VLC_EGENERIC;
+                }
+                tid = p_stra->data.p_stra->i_track_ID;
+            }
+
+            p_track = fMP4_GetTrack( p_demux, tid );
+            if( !p_track )
+                return VLC_EGENERIC;
+            p_track->b_adaption = true;
+
+            return fMP4_GetChunks( p_demux, i_tk_id );
+        }
+
+        if( fMP4_GetChunk( p_demux, p_chunk, (unsigned *)&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
+ * \return 1 on success, 0 on error.
+ * TODO check for newly selected track
+ */
+int DemuxFrg( demux_t *p_demux )
+{
+    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 );
+                return 0;
+            }
+
+            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