mp4.c

uclinux 下的vlc播放器源代码

        {
            bo_add_32be( elst, p_stream->i_duration *
                         i_movie_timescale / I64C(1000000) );
            bo_add_32be( elst, 0 );
        }
        bo_add_16be( elst, 1 );
        bo_add_16be( elst, 0 );

        box_fix( elst );
        box_gather( edts, elst );
        box_fix( edts );
        box_gather( trak, edts );

        /* *** add /moov/trak/mdia *** */
        mdia = box_new( "mdia" );

        /* media header */
        if( !p_sys->b_64_ext )
        {
            mdhd = box_full_new( "mdhd", 0, 0 );
            bo_add_32be( mdhd, get_timestamp() );   // creation time
            bo_add_32be( mdhd, get_timestamp() );   // modification time
            bo_add_32be( mdhd, i_timescale);        // timescale
            bo_add_32be( mdhd, p_stream->i_duration * (int64_t)i_timescale /
                               (mtime_t)1000000 );  // duration
        }
        else
        {
            mdhd = box_full_new( "mdhd", 1, 0 );
            bo_add_64be( mdhd, get_timestamp() );   // creation time
            bo_add_64be( mdhd, get_timestamp() );   // modification time
            bo_add_32be( mdhd, i_timescale);        // timescale
            bo_add_64be( mdhd, p_stream->i_duration * (int64_t)i_timescale /
                               (mtime_t)1000000 );  // duration
        }

        if( p_stream->fmt.psz_language )
        {
            char *psz = p_stream->fmt.psz_language;
            const iso639_lang_t *pl = NULL;
            uint16_t lang = 0x0;

            if( strlen( psz ) == 2 )
            {
                pl = GetLang_1( psz );
            }
            else if( strlen( psz ) == 3 )
            {
                pl = GetLang_2B( psz );
                if( !strcmp( pl->psz_iso639_1, "??" ) )
                {
                    pl = GetLang_2T( psz );
                }
            }
            if( pl && strcmp( pl->psz_iso639_1, "??" ) )
            {
                lang = ( ( pl->psz_iso639_2T[0] - 0x60 ) << 10 ) |
                       ( ( pl->psz_iso639_2T[1] - 0x60 ) <<  5 ) |
                       ( ( pl->psz_iso639_2T[2] - 0x60 ) );
            }
            bo_add_16be( mdhd, lang );          // language
        }
        else
        {
            bo_add_16be( mdhd, 0    );          // language
        }
        bo_add_16be( mdhd, 0    );              // predefined
        box_fix( mdhd );
        box_gather( mdia, mdhd );

        /* handler reference */
        hdlr = box_full_new( "hdlr", 0, 0 );

        if( p_sys->b_mov )
            bo_add_fourcc( hdlr, "mhlr" );         // media handler
        else
            bo_add_32be( hdlr, 0 );

        if( p_stream->fmt.i_cat == AUDIO_ES )
            bo_add_fourcc( hdlr, "soun" );
        else if( p_stream->fmt.i_cat == VIDEO_ES )
            bo_add_fourcc( hdlr, "vide" );
        else if( p_stream->fmt.i_cat == SPU_ES )
            bo_add_fourcc( hdlr, "text" );

        bo_add_32be( hdlr, 0 );         // reserved
        bo_add_32be( hdlr, 0 );         // reserved
        bo_add_32be( hdlr, 0 );         // reserved

        if( p_sys->b_mov )
            bo_add_8( hdlr, 12 );   /* Pascal string for .mov */

        if( p_stream->fmt.i_cat == AUDIO_ES )
            bo_add_mem( hdlr, 12, (uint8_t*)"SoundHandler" );
        else if( p_stream->fmt.i_cat == VIDEO_ES )
            bo_add_mem( hdlr, 12, (uint8_t*)"VideoHandler" );
        else
            bo_add_mem( hdlr, 12, (uint8_t*)"Text Handler" );

        if( !p_sys->b_mov )
            bo_add_8( hdlr, 0 );   /* asciiz string for .mp4, yes that's BRAIN DAMAGED F**K MP4 */

        box_fix( hdlr );
        box_gather( mdia, hdlr );

        /* minf*/
        minf = box_new( "minf" );

        /* add smhd|vmhd */
        if( p_stream->fmt.i_cat == AUDIO_ES )
        {
            bo_t *smhd;

            smhd = box_full_new( "smhd", 0, 0 );
            bo_add_16be( smhd, 0 );     // balance
            bo_add_16be( smhd, 0 );     // reserved
            box_fix( smhd );

            box_gather( minf, smhd );
        }
        else if( p_stream->fmt.i_cat == VIDEO_ES )
        {
            bo_t *vmhd;

            vmhd = box_full_new( "vmhd", 0, 1 );
            bo_add_16be( vmhd, 0 );     // graphicsmode
            for( i = 0; i < 3; i++ )
            {
                bo_add_16be( vmhd, 0 ); // opcolor
            }
            box_fix( vmhd );

            box_gather( minf, vmhd );
        }
        else if( p_stream->fmt.i_cat == SPU_ES )
        {
            bo_t *gmhd = box_new( "gmhd" );
            bo_t *gmin = box_full_new( "gmin", 0, 1 );

            bo_add_16be( gmin, 0 );     // graphicsmode
            for( i = 0; i < 3; i++ )
            {
                bo_add_16be( gmin, 0 ); // opcolor
            }
            bo_add_16be( gmin, 0 );     // balance
            bo_add_16be( gmin, 0 );     // reserved
            box_fix( gmin );

            box_gather( gmhd, gmin );
            box_fix( gmhd );

            box_gather( minf, gmhd );
        }

        /* dinf */
        dinf = box_new( "dinf" );
        dref = box_full_new( "dref", 0, 0 );
        bo_add_32be( dref, 1 );
        url = box_full_new( "url ", 0, 0x01 );
        box_fix( url );
        box_gather( dref, url );
        box_fix( dref );
        box_gather( dinf, dref );

        /* append dinf to mdia */
        box_fix( dinf );
        box_gather( minf, dinf );

        /* add stbl */
        stbl = GetStblBox( p_mux, p_stream );

        /* append stbl to minf */
        p_stream->i_stco_pos += minf->i_buffer;
        box_gather( minf, stbl );

        /* append minf to mdia */
        box_fix( minf );
        p_stream->i_stco_pos += mdia->i_buffer;
        box_gather( mdia, minf );

        /* append mdia to trak */
        box_fix( mdia );
        p_stream->i_stco_pos += trak->i_buffer;
        box_gather( trak, mdia );

        /* append trak to moov */
        box_fix( trak );
        p_stream->i_stco_pos += moov->i_buffer;
        box_gather( moov, trak );
    }

    /* Add user data tags */
    box_gather( moov, GetUdtaTag( p_mux ) );

    box_fix( moov );
    return moov;
}

/****************************************************************************/

static void bo_init( bo_t *p_bo, int i_size, uint8_t *p_buffer,
                     vlc_bool_t b_grow )
{
    if( !p_buffer )
    {
        p_bo->i_buffer_size = __MAX( i_size, 1024 );
        p_bo->p_buffer = malloc( p_bo->i_buffer_size );
    }
    else
    {
        p_bo->i_buffer_size = i_size;
        p_bo->p_buffer = p_buffer;
    }

    p_bo->b_grow = b_grow;
    p_bo->i_buffer = 0;
}

static void bo_add_8( bo_t *p_bo, uint8_t i )
{
    if( p_bo->i_buffer < p_bo->i_buffer_size )
    {
        p_bo->p_buffer[p_bo->i_buffer] = i;
    }
    else if( p_bo->b_grow )
    {
        p_bo->i_buffer_size += 1024;
        p_bo->p_buffer = realloc( p_bo->p_buffer, p_bo->i_buffer_size );

        p_bo->p_buffer[p_bo->i_buffer] = i;
    }

    p_bo->i_buffer++;
}

static void bo_add_16be( bo_t *p_bo, uint16_t i )
{
    bo_add_8( p_bo, ( ( i >> 8) &0xff ) );
    bo_add_8( p_bo, i &0xff );
}

static void bo_add_24be( bo_t *p_bo, uint32_t i )
{
    bo_add_8( p_bo, ( ( i >> 16) &0xff ) );
    bo_add_8( p_bo, ( ( i >> 8) &0xff ) );
    bo_add_8( p_bo, (   i &0xff ) );
}
static void bo_add_32be( bo_t *p_bo, uint32_t i )
{
    bo_add_16be( p_bo, ( ( i >> 16) &0xffff ) );
    bo_add_16be( p_bo, i &0xffff );
}

static void bo_fix_32be ( bo_t *p_bo, int i_pos, uint32_t i)
{
    p_bo->p_buffer[i_pos    ] = ( i >> 24 )&0xff;
    p_bo->p_buffer[i_pos + 1] = ( i >> 16 )&0xff;
    p_bo->p_buffer[i_pos + 2] = ( i >>  8 )&0xff;
    p_bo->p_buffer[i_pos + 3] = ( i       )&0xff;
}

static void bo_add_64be( bo_t *p_bo, uint64_t i )
{
    bo_add_32be( p_bo, ( ( i >> 32) &0xffffffff ) );
    bo_add_32be( p_bo, i &0xffffffff );
}

static void bo_add_fourcc( bo_t *p_bo, char *fcc )
{
    bo_add_8( p_bo, fcc[0] );
    bo_add_8( p_bo, fcc[1] );
    bo_add_8( p_bo, fcc[2] );
    bo_add_8( p_bo, fcc[3] );
}

static void bo_add_mem( bo_t *p_bo, int i_size, uint8_t *p_mem )
{
    int i;

    for( i = 0; i < i_size; i++ )
    {
        bo_add_8( p_bo, p_mem[i] );
    }
}

static void bo_add_descr( bo_t *p_bo, uint8_t tag, uint32_t i_size )
{
    uint32_t i_length;
    uint8_t  vals[4];

    i_length = i_size;
    vals[3] = (unsigned char)(i_length & 0x7f);
    i_length >>= 7;
    vals[2] = (unsigned char)((i_length & 0x7f) | 0x80); 
    i_length >>= 7;
    vals[1] = (unsigned char)((i_length & 0x7f) | 0x80); 
    i_length >>= 7;
    vals[0] = (unsigned char)((i_length & 0x7f) | 0x80);

    bo_add_8( p_bo, tag );

    if( i_size < 0x00000080 )
    {
        bo_add_8( p_bo, vals[3] );
    }
    else if( i_size < 0x00004000 )
    {
        bo_add_8( p_bo, vals[2] );
        bo_add_8( p_bo, vals[3] );
    }
    else if( i_size < 0x00200000 )
    {
        bo_add_8( p_bo, vals[1] );
        bo_add_8( p_bo, vals[2] );
        bo_add_8( p_bo, vals[3] );
    }
    else if( i_size < 0x10000000 )
    {
        bo_add_8( p_bo, vals[0] );
        bo_add_8( p_bo, vals[1] );
        bo_add_8( p_bo, vals[2] );
        bo_add_8( p_bo, vals[3] );
    }
}

static void bo_add_bo( bo_t *p_bo, bo_t *p_bo2 )
{
    int i;

    for( i = 0; i < p_bo2->i_buffer; i++ )
    {
        bo_add_8( p_bo, p_bo2->p_buffer[i] );
    }
}

static bo_t * box_new( char *fcc )
{
    bo_t *box;

    if( ( box = malloc( sizeof( bo_t ) ) ) )
    {
        bo_init( box, 0, NULL, VLC_TRUE );

        bo_add_32be  ( box, 0 );
        bo_add_fourcc( box, fcc );
    }

    return box;
}

static bo_t * box_full_new( char *fcc, uint8_t v, uint32_t f )
{
    bo_t *box;

    if( ( box = malloc( sizeof( bo_t ) ) ) )
    {
        bo_init( box, 0, NULL, VLC_TRUE );

        bo_add_32be  ( box, 0 );
        bo_add_fourcc( box, fcc );
        bo_add_8     ( box, v );
        bo_add_24be  ( box, f );
    }

    return box;
}

static void box_fix( bo_t *box )
{
    bo_t box_tmp;

    memcpy( &box_tmp, box, sizeof( bo_t ) );

    box_tmp.i_buffer = 0;
    bo_add_32be( &box_tmp, box->i_buffer );
}

static void box_free( bo_t *box )
{
    if( box->p_buffer )
    {
        free( box->p_buffer );
    }

    free( box );
}

static void box_gather ( bo_t *box, bo_t *box2 )
{
    bo_add_bo( box, box2 );
    box_free( box2 );
}

static block_t * bo_to_sout( sout_instance_t *p_sout,  bo_t *box )
{
    block_t *p_buf;

    p_buf = block_New( p_sout, box->i_buffer );
    if( box->i_buffer > 0 )
    {
        memcpy( p_buf->p_buffer, box->p_buffer, box->i_buffer );
    }

    return p_buf;
}

static void box_send( sout_mux_t *p_mux,  bo_t *box )
{
    block_t *p_buf;

    p_buf = bo_to_sout( p_mux->p_sout, box );
    box_free( box );

    sout_AccessOutWrite( p_mux->p_access, p_buf );
}

static int64_t get_timestamp()
{
    int64_t i_timestamp = 0;

#ifdef HAVE_TIME_H
    i_timestamp = time(NULL);
    i_timestamp += 2082844800; // MOV/MP4 start date is 1/1/1904
    // 208284480 is (((1970 - 1904) * 365) + 17) * 24 * 60 * 60
#endif

    return i_timestamp;
}