mp4.c

uclinux 下的vlc播放器源代码

    wave = box_new( "wave" );

    box = box_new( "frma" );
    bo_add_fourcc( box, "mp4a" );
    box_fix( box );
    box_gather( wave, box );

    box = box_new( "mp4a" );
    bo_add_32be( box, 0 );
    box_fix( box );
    box_gather( wave, box );

    box = GetESDS( p_stream );
    box_fix( box );
    box_gather( wave, box );

    box = box_new( "srcq" );
    bo_add_32be( box, 0x40 );
    box_fix( box );
    box_gather( wave, box );

    /* wazza ? */
    bo_add_32be( wave, 8 ); /* new empty box */
    bo_add_32be( wave, 0 ); /* box label */

    box_fix( wave );

    return wave;
}

static bo_t *GetDamrTag( mp4_stream_t *p_stream )
{
    bo_t *damr;

    damr = box_new( "damr" );

    bo_add_fourcc( damr, "REFC" );
    bo_add_8( damr, 0 );

    if( p_stream->fmt.i_codec == VLC_FOURCC( 's', 'a', 'm', 'r' ) )
        bo_add_16be( damr, 0x81ff ); /* Mode set (all modes for AMR_NB) */
    else
        bo_add_16be( damr, 0x83ff ); /* Mode set (all modes for AMR_WB) */
    bo_add_16be( damr, 0x1 ); /* Mode change period (no restriction) */

    box_fix( damr );

    return damr;
}

static bo_t *GetD263Tag( mp4_stream_t *p_stream )
{
    bo_t *d263;

    d263 = box_new( "d263" );

    bo_add_fourcc( d263, "VLC " );
    bo_add_16be( d263, 0xa );
    bo_add_8( d263, 0 );

    box_fix( d263 );

    return d263;
}

static bo_t *GetAvcCTag( mp4_stream_t *p_stream )
{
    bo_t *avcC;

    /* FIXME use better value */
    avcC = box_new( "avcC" );
    bo_add_8( avcC, 1 );      /* configuration version */
    bo_add_8( avcC, p_stream->avc.i_profile );
    bo_add_8( avcC, p_stream->avc.i_profile_compat );
    bo_add_8( avcC, p_stream->avc.i_level );       /* level, 5.1 */
    bo_add_8( avcC, 0xff );   /* 0b11111100 | lengthsize = 0x11 */

    bo_add_8( avcC, 0xe0 | (p_stream->avc.i_sps > 0 ? 1 : 0) );   /* 0b11100000 | sps_count */
    if( p_stream->avc.i_sps > 0 )
    {
        bo_add_16be( avcC, p_stream->avc.i_sps );
        bo_add_mem( avcC, p_stream->avc.i_sps, p_stream->avc.sps );
    }

    bo_add_8( avcC, (p_stream->avc.i_pps > 0 ? 1 : 0) );   /* pps_count */
    if( p_stream->avc.i_pps > 0 )
    {
        bo_add_16be( avcC, p_stream->avc.i_pps );
        bo_add_mem( avcC, p_stream->avc.i_pps, p_stream->avc.pps );
    }
    box_fix( avcC );

    return avcC;
}

/* TODO: No idea about these values */
static bo_t *GetSVQ3Tag( mp4_stream_t *p_stream )
{
    bo_t *smi = box_new( "SMI " );

    if( p_stream->fmt.i_extra > 0x4e )
    {
        uint8_t *p_end = &((uint8_t*)p_stream->fmt.p_extra)[p_stream->fmt.i_extra];
        uint8_t *p     = &((uint8_t*)p_stream->fmt.p_extra)[0x46];

        while( p + 8 < p_end )
        {
            int i_size = GetDWBE( p );
            if( i_size <= 1 )
            {
                /* FIXME handle 1 as long size */
                break;
            }
            if( !strncmp( (const char *)&p[4], "SMI ", 4 ) )
            {
                bo_add_mem( smi, p_end - p - 8, &p[8] );
                return smi;
            }
            p += i_size;
        }
    }

    /* Create a dummy one in fallback */
    bo_add_fourcc( smi, "SEQH" );
    bo_add_32be( smi, 0x5 );
    bo_add_32be( smi, 0xe2c0211d );
    bo_add_8( smi, 0xc0 );
    box_fix( smi );

    return smi;
}

static bo_t *GetUdtaTag( sout_mux_t *p_mux )
{
    sout_mux_sys_t *p_sys = p_mux->p_sys;
    bo_t *udta = box_new( "udta" );
    vlc_meta_t *p_meta = p_mux->p_sout->p_meta;
    int i_track;

    /* Requirements */
    for( i_track = 0; i_track < p_sys->i_nb_streams; i_track++ )
    {
        mp4_stream_t *p_stream = p_sys->pp_streams[i_track];

        if( p_stream->fmt.i_codec == VLC_FOURCC('m','p','4','v') ||
            p_stream->fmt.i_codec == VLC_FOURCC('m','p','4','a') )
        {
            bo_t *box = box_new( "\251req" );
            /* String length */
            bo_add_16be( box, sizeof("QuickTime 6.0 or greater") - 1);
            bo_add_16be( box, 0 );
            bo_add_mem( box, sizeof("QuickTime 6.0 or greater") - 1,
                        (uint8_t *)"QuickTime 6.0 or greater" );
            box_fix( box );
            box_gather( udta, box );
            break;
        }
    }

    /* Encoder */
    {
        bo_t *box = box_new( "\251enc" );
        /* String length */
        bo_add_16be( box, sizeof(PACKAGE_STRING " stream output") - 1);
        bo_add_16be( box, 0 );
        bo_add_mem( box, sizeof(PACKAGE_STRING " stream output") - 1,
                    (uint8_t*)PACKAGE_STRING " stream output" );
        box_fix( box );
        box_gather( udta, box );
    }

    /* Misc atoms */
    if( p_meta )
    {
        int i;
        for( i = 0; i < p_meta->i_meta; i++ )
        {
            bo_t *box = NULL;

            if( !strcmp( p_meta->name[i], VLC_META_TITLE ) )
                box = box_new( "\251nam" );
            else if( !strcmp( p_meta->name[i], VLC_META_AUTHOR ) )
                box = box_new( "\251aut" );
            else if( !strcmp( p_meta->name[i], VLC_META_ARTIST ) )
                box = box_new( "\251ART" );
            else if( !strcmp( p_meta->name[i], VLC_META_GENRE ) )
                box = box_new( "\251gen" );
            else if( !strcmp( p_meta->name[i], VLC_META_COPYRIGHT ) )
                box = box_new( "\251cpy" );
            else if( !strcmp( p_meta->name[i], VLC_META_DESCRIPTION ) )
                box = box_new( "\251des" );
            else if( !strcmp( p_meta->name[i], VLC_META_DATE ) )
                box = box_new( "\251day" );
            else if( !strcmp( p_meta->name[i], VLC_META_URL ) )
                box = box_new( "\251url" );

            if( box )
            {
                bo_add_16be( box, strlen( p_meta->value[i] ) );
                bo_add_16be( box, 0 );
                bo_add_mem( box, strlen( p_meta->value[i] ),
                            (uint8_t*)(p_meta->value[i]) );
                box_fix( box );
                box_gather( udta, box );
            }
        }
    }

    box_fix( udta );
    return udta;
}

static bo_t *GetSounBox( sout_mux_t *p_mux, mp4_stream_t *p_stream )
{
    sout_mux_sys_t *p_sys = p_mux->p_sys;
    vlc_bool_t b_descr = VLC_FALSE;
    bo_t *soun;
    char fcc[4] = "    ";
    int  i;

    switch( p_stream->fmt.i_codec )
    {
    case VLC_FOURCC('m','p','4','a'):
        memcpy( fcc, "mp4a", 4 );
        b_descr = VLC_TRUE;
        break;

    case VLC_FOURCC('s','a','m','r'):
    case VLC_FOURCC('s','a','w','b'):
        memcpy( fcc, (char*)&p_stream->fmt.i_codec, 4 );
        b_descr = VLC_TRUE;
        break;

    case VLC_FOURCC('m','p','g','a'):
        if( p_sys->b_mov )
            memcpy( fcc, ".mp3", 4 );
        else
        {
            memcpy( fcc, "mp4a", 4 );
            b_descr = VLC_TRUE;
        }
        break;

    default:
        memcpy( fcc, (char*)&p_stream->fmt.i_codec, 4 );
        break;
    }

    soun = box_new( fcc );
    for( i = 0; i < 6; i++ )
    {
        bo_add_8( soun, 0 );        // reserved;
    }
    bo_add_16be( soun, 1 );         // data-reference-index

    /* SoundDescription */
    if( p_sys->b_mov &&
        p_stream->fmt.i_codec == VLC_FOURCC('m','p','4','a') )
    {
        bo_add_16be( soun, 1 );     // version 1;
    }
    else
    {
        bo_add_16be( soun, 0 );     // version 0;
    }
    bo_add_16be( soun, 0 );         // revision level (0)
    bo_add_32be( soun, 0 );         // vendor
    // channel-count
    bo_add_16be( soun, p_stream->fmt.audio.i_channels );
    // sample size
    bo_add_16be( soun, p_stream->fmt.audio.i_bitspersample ?
                 p_stream->fmt.audio.i_bitspersample : 16 );
    bo_add_16be( soun, -2 );        // compression id
    bo_add_16be( soun, 0 );         // packet size (0)
    bo_add_16be( soun, p_stream->fmt.audio.i_rate ); // sampleratehi
    bo_add_16be( soun, 0 );                             // sampleratelo

    /* Extended data for SoundDescription V1 */
    if( p_sys->b_mov &&
        p_stream->fmt.i_codec == VLC_FOURCC('m','p','4','a') )
    {
        /* samples per packet */
        bo_add_32be( soun, p_stream->fmt.audio.i_frame_length );
        bo_add_32be( soun, 1536 ); /* bytes per packet */
        bo_add_32be( soun, 2 );    /* bytes per frame */
        /* bytes per sample */
        bo_add_32be( soun, 2 /*p_stream->fmt.audio.i_bitspersample/8 */);
    }

    /* Add an ES Descriptor */
    if( b_descr )
    {
        bo_t *box;

        if( p_sys->b_mov &&
            p_stream->fmt.i_codec == VLC_FOURCC('m','p','4','a') )
        {
            box = GetWaveTag( p_stream );
        }
        else if( p_stream->fmt.i_codec == VLC_FOURCC('s','a','m','r') )
        {
            box = GetDamrTag( p_stream );
        }
        else
        {
            box = GetESDS( p_stream );
        }
        box_fix( box );
        box_gather( soun, box );
    }

    box_fix( soun );

    return soun;
}

static bo_t *GetVideBox( sout_mux_t *p_mux, mp4_stream_t *p_stream )
{

    bo_t *vide;
    char fcc[4] = "    ";
    int  i;

    switch( p_stream->fmt.i_codec )
    {
    case VLC_FOURCC('m','p','4','v'):
    case VLC_FOURCC('m','p','g','v'):
        memcpy( fcc, "mp4v", 4 );
        break;

    case VLC_FOURCC('M','J','P','G'):
        memcpy( fcc, "mjpa", 4 );
        break;

    case VLC_FOURCC('S','V','Q','1'):
        memcpy( fcc, "SVQ1", 4 );
        break;

    case VLC_FOURCC('S','V','Q','3'):
        memcpy( fcc, "SVQ3", 4 );
        break;

    case VLC_FOURCC('H','2','6','3'):
        memcpy( fcc, "s263", 4 );
        break;

    case VLC_FOURCC('h','2','6','4'):
        memcpy( fcc, "avc1", 4 );
        break;

    default:
        memcpy( fcc, (char*)&p_stream->fmt.i_codec, 4 );
        break;
    }

    vide = box_new( fcc );
    for( i = 0; i < 6; i++ )
    {
        bo_add_8( vide, 0 );        // reserved;
    }
    bo_add_16be( vide, 1 );         // data-reference-index

    bo_add_16be( vide, 0 );         // predefined;
    bo_add_16be( vide, 0 );         // reserved;
    for( i = 0; i < 3; i++ )
    {
        bo_add_32be( vide, 0 );     // predefined;
    }

    bo_add_16be( vide, p_stream->fmt.video.i_width );  // i_width
    bo_add_16be( vide, p_stream->fmt.video.i_height ); // i_height

    bo_add_32be( vide, 0x00480000 );                // h 72dpi
    bo_add_32be( vide, 0x00480000 );                // v 72dpi

    bo_add_32be( vide, 0 );         // data size, always 0
    bo_add_16be( vide, 1 );         // frames count per sample

    // compressor name;
    for( i = 0; i < 32; i++ )
    {
        bo_add_8( vide, 0 );
    }

    bo_add_16be( vide, 0x18 );      // depth
    bo_add_16be( vide, 0xffff );    // predefined

    /* add an ES Descriptor */
    switch( p_stream->fmt.i_codec )
    {
    case VLC_FOURCC('m','p','4','v'):
    case VLC_FOURCC('m','p','g','v'):
        {
            bo_t *esds = GetESDS( p_stream );

            box_fix( esds );
            box_gather( vide, esds );
        }
        break;

    case VLC_FOURCC('H','2','6','3'):
        {
            bo_t *d263 = GetD263Tag( p_stream );

            box_fix( d263 );
            box_gather( vide, d263 );
        }
        break;

    case VLC_FOURCC('S','V','Q','3'):
        {
            bo_t *esds = GetSVQ3Tag( p_stream );

            box_fix( esds );
            box_gather( vide, esds );
        }
        break;

    case VLC_FOURCC('h','2','6','4'):
        box_gather( vide, GetAvcCTag( p_stream ) );
        break;

    default:
        break;
    }

    box_fix( vide );

    return vide;
}