libmp4.c

来自「VLC媒体播放程序」· C语言 代码 · 共 2,060 行 · 第 1/5 页

    MP4_GET2BYTES( p_box->data.p_sample_vide->i_depth );
    MP4_GET2BYTES( p_box->data.p_sample_vide->i_qt_color_table );

    MP4_SeekStream( p_stream, p_box->i_pos + MP4_BOX_HEADERSIZE( p_box ) + 78);
    MP4_ReadBoxContainerRaw( p_stream, p_box );

#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input, "read box: \"vide\" in stsd %dx%d depth %d",
                      p_box->data.p_sample_vide->i_width,
                      p_box->data.p_sample_vide->i_height,
                      p_box->data.p_sample_vide->i_depth );

#endif
    MP4_READBOX_EXIT( 1 );
}


static int MP4_ReadBox_stsd( MP4_Stream_t *p_stream, MP4_Box_t *p_box )
{

    MP4_READBOX_ENTER( MP4_Box_data_stsd_t );

    MP4_GETVERSIONFLAGS( p_box->data.p_stsd );

    MP4_GET4BYTES( p_box->data.p_stsd->i_entry_count );

    MP4_SeekStream( p_stream, p_box->i_pos + MP4_BOX_HEADERSIZE( p_box ) + 8 );

    MP4_ReadBoxContainerRaw( p_stream, p_box );

#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input, "read box: \"stsd\" entry-count %d",
                      p_box->data.p_stsd->i_entry_count );

#endif
    MP4_READBOX_EXIT( 1 );
}


static int MP4_ReadBox_stsz( MP4_Stream_t *p_stream, MP4_Box_t *p_box )
{
    unsigned int i;

    MP4_READBOX_ENTER( MP4_Box_data_stsz_t );

    MP4_GETVERSIONFLAGS( p_box->data.p_stsz );

    MP4_GET4BYTES( p_box->data.p_stsz->i_sample_size );

    MP4_GET4BYTES( p_box->data.p_stsz->i_sample_count );

    p_box->data.p_stsz->i_entry_size =
        calloc( sizeof( uint32_t ), p_box->data.p_stsz->i_sample_count );

    if( !p_box->data.p_stsz->i_sample_size )
    {
        for( i=0; (i<p_box->data.p_stsz->i_sample_count)&&(i_read >= 4 ); i++ )
        {
            MP4_GET4BYTES( p_box->data.p_stsz->i_entry_size[i] );
        }
    }

#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input, "read box: \"stsz\" sample-size %d sample-count %d",
                      p_box->data.p_stsz->i_sample_size,
                      p_box->data.p_stsz->i_sample_count );

#endif
    MP4_READBOX_EXIT( 1 );
}

static void MP4_FreeBox_stsz( MP4_Box_t *p_box )
{
    FREE( p_box->data.p_stsz->i_entry_size );
}

static int MP4_ReadBox_stsc( MP4_Stream_t *p_stream, MP4_Box_t *p_box )
{
    unsigned int i;

    MP4_READBOX_ENTER( MP4_Box_data_stsc_t );

    MP4_GETVERSIONFLAGS( p_box->data.p_stsc );

    MP4_GET4BYTES( p_box->data.p_stsc->i_entry_count );

    p_box->data.p_stsc->i_first_chunk =
        calloc( sizeof( uint32_t ), p_box->data.p_stsc->i_entry_count );
    p_box->data.p_stsc->i_samples_per_chunk =
        calloc( sizeof( uint32_t ), p_box->data.p_stsc->i_entry_count );
    p_box->data.p_stsc->i_sample_description_index =
        calloc( sizeof( uint32_t ), p_box->data.p_stsc->i_entry_count );

    for( i = 0; (i < p_box->data.p_stsc->i_entry_count )&&( i_read >= 12 );i++ )
    {
        MP4_GET4BYTES( p_box->data.p_stsc->i_first_chunk[i] );
        MP4_GET4BYTES( p_box->data.p_stsc->i_samples_per_chunk[i] );
        MP4_GET4BYTES( p_box->data.p_stsc->i_sample_description_index[i] );
    }

#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input, "read box: \"stsc\" entry-count %d",
                      p_box->data.p_stsc->i_entry_count );

#endif
    MP4_READBOX_EXIT( 1 );
}

static void MP4_FreeBox_stsc( MP4_Box_t *p_box )
{
    FREE( p_box->data.p_stsc->i_first_chunk );
    FREE( p_box->data.p_stsc->i_samples_per_chunk );
    FREE( p_box->data.p_stsc->i_sample_description_index );
}

static int MP4_ReadBox_stco_co64( MP4_Stream_t *p_stream, MP4_Box_t *p_box )
{
    unsigned int i;

    MP4_READBOX_ENTER( MP4_Box_data_co64_t );

    MP4_GETVERSIONFLAGS( p_box->data.p_co64 );

    MP4_GET4BYTES( p_box->data.p_co64->i_entry_count );

    p_box->data.p_co64->i_chunk_offset =
        calloc( sizeof( uint64_t ), p_box->data.p_co64->i_entry_count );

    for( i = 0; i < p_box->data.p_co64->i_entry_count; i++ )
    {
        if( p_box->i_type == FOURCC_stco )
        {
            if( i_read < 4 )
            {
                break;
            }
            MP4_GET4BYTES( p_box->data.p_co64->i_chunk_offset[i] );
        }
        else
        {
            if( i_read < 8 )
            {
                break;
            }
            MP4_GET8BYTES( p_box->data.p_co64->i_chunk_offset[i] );
        }
    }

#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input, "read box: \"co64\" entry-count %d",
                      p_box->data.p_co64->i_entry_count );

#endif
    MP4_READBOX_EXIT( 1 );
}

static void MP4_FreeBox_stco_co64( MP4_Box_t *p_box )
{
    FREE( p_box->data.p_co64->i_chunk_offset );
}

static int MP4_ReadBox_stss( MP4_Stream_t *p_stream, MP4_Box_t *p_box )
{
    unsigned int i;

    MP4_READBOX_ENTER( MP4_Box_data_stss_t );

    MP4_GETVERSIONFLAGS( p_box->data.p_stss );

    MP4_GET4BYTES( p_box->data.p_stss->i_entry_count );

    p_box->data.p_stss->i_sample_number =
        calloc( sizeof( uint32_t ), p_box->data.p_stss->i_entry_count );

    for( i = 0; (i < p_box->data.p_stss->i_entry_count )&&( i_read >= 4 ); i++ )
    {

        MP4_GET4BYTES( p_box->data.p_stss->i_sample_number[i] );
        /* XXX in libmp4 sample begin at 0 */
        p_box->data.p_stss->i_sample_number[i]--;
    }

#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input, "read box: \"stss\" entry-count %d",
                      p_box->data.p_stss->i_entry_count );

#endif
    MP4_READBOX_EXIT( 1 );
}

static void MP4_FreeBox_stss( MP4_Box_t *p_box )
{
    FREE( p_box->data.p_stss->i_sample_number )
}

static int MP4_ReadBox_stsh( MP4_Stream_t *p_stream, MP4_Box_t *p_box )
{
    unsigned int i;

    MP4_READBOX_ENTER( MP4_Box_data_stsh_t );

    MP4_GETVERSIONFLAGS( p_box->data.p_stsh );


    MP4_GET4BYTES( p_box->data.p_stsh->i_entry_count );

    p_box->data.p_stsh->i_shadowed_sample_number =
        calloc( sizeof( uint32_t ), p_box->data.p_stsh->i_entry_count );

    p_box->data.p_stsh->i_sync_sample_number =
        calloc( sizeof( uint32_t ), p_box->data.p_stsh->i_entry_count );


    for( i = 0; (i < p_box->data.p_stss->i_entry_count )&&( i_read >= 8 ); i++ )
    {

        MP4_GET4BYTES( p_box->data.p_stsh->i_shadowed_sample_number[i] );
        MP4_GET4BYTES( p_box->data.p_stsh->i_sync_sample_number[i] );
    }

#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input, "read box: \"stsh\" entry-count %d",
                      p_box->data.p_stsh->i_entry_count );
#endif
    MP4_READBOX_EXIT( 1 );
}

static void MP4_FreeBox_stsh( MP4_Box_t *p_box )
{
    FREE( p_box->data.p_stsh->i_shadowed_sample_number )
    FREE( p_box->data.p_stsh->i_sync_sample_number )
}


static int MP4_ReadBox_stdp( MP4_Stream_t *p_stream, MP4_Box_t *p_box )
{
    unsigned int i;

    MP4_READBOX_ENTER( MP4_Box_data_stdp_t );

    MP4_GETVERSIONFLAGS( p_box->data.p_stdp );

    p_box->data.p_stdp->i_priority =
        calloc( sizeof( uint16_t ), i_read / 2 );

    for( i = 0; i < i_read / 2 ; i++ )
    {

        MP4_GET2BYTES( p_box->data.p_stdp->i_priority[i] );
    }

#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input, "read box: \"stdp\" entry-count "I64Fd,
                      i_read / 2 );

#endif
    MP4_READBOX_EXIT( 1 );
}

static void MP4_FreeBox_stdp( MP4_Box_t *p_box )
{
    FREE( p_box->data.p_stdp->i_priority )
}

static int MP4_ReadBox_padb( MP4_Stream_t *p_stream, MP4_Box_t *p_box )
{
    unsigned int i;

    MP4_READBOX_ENTER( MP4_Box_data_padb_t );

    MP4_GETVERSIONFLAGS( p_box->data.p_padb );


    MP4_GET4BYTES( p_box->data.p_padb->i_sample_count );

    p_box->data.p_padb->i_reserved1 =
        calloc( sizeof( uint16_t ), ( p_box->data.p_padb->i_sample_count + 1 ) / 2 );
    p_box->data.p_padb->i_pad2 =
        calloc( sizeof( uint16_t ), ( p_box->data.p_padb->i_sample_count + 1 ) / 2 );
    p_box->data.p_padb->i_reserved2 =
        calloc( sizeof( uint16_t ), ( p_box->data.p_padb->i_sample_count + 1 ) / 2 );
    p_box->data.p_padb->i_pad1 =
        calloc( sizeof( uint16_t ), ( p_box->data.p_padb->i_sample_count + 1 ) / 2 );


    for( i = 0; i < i_read / 2 ; i++ )
    {
        p_box->data.p_padb->i_reserved1[i] = ( (*p_peek) >> 7 )&0x01;
        p_box->data.p_padb->i_pad2[i] = ( (*p_peek) >> 4 )&0x07;
        p_box->data.p_padb->i_reserved1[i] = ( (*p_peek) >> 3 )&0x01;
        p_box->data.p_padb->i_pad1[i] = ( (*p_peek) )&0x07;

        p_peek += 1; i_read -= 1;
    }

#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input, "read box: \"stdp\" entry-count "I64Fd,
                      i_read / 2 );

#endif
    MP4_READBOX_EXIT( 1 );
}

static void MP4_FreeBox_padb( MP4_Box_t *p_box )
{
    FREE( p_box->data.p_padb->i_reserved1 );
    FREE( p_box->data.p_padb->i_pad2 );
    FREE( p_box->data.p_padb->i_reserved2 );
    FREE( p_box->data.p_padb->i_pad1 );
}

static int MP4_ReadBox_elst( MP4_Stream_t *p_stream, MP4_Box_t *p_box )
{
    unsigned int i;

    MP4_READBOX_ENTER( MP4_Box_data_padb_t );

    MP4_GETVERSIONFLAGS( p_box->data.p_elst );


    MP4_GET4BYTES( p_box->data.p_elst->i_entry_count );

    p_box->data.p_elst->i_segment_duration =
        calloc( sizeof( uint64_t ), p_box->data.p_elst->i_entry_count );
    p_box->data.p_elst->i_media_time =
        calloc( sizeof( int64_t ),  p_box->data.p_elst->i_entry_count );
    p_box->data.p_elst->i_media_rate_integer =
        calloc( sizeof( uint16_t ), p_box->data.p_elst->i_entry_count );
    p_box->data.p_elst->i_media_rate_fraction=
        calloc( sizeof( uint16_t ), p_box->data.p_elst->i_entry_count );


    for( i = 0; i < p_box->data.p_elst->i_entry_count; i++ )
    {
        if( p_box->data.p_elst->i_version == 1 )
        {

            MP4_GET8BYTES( p_box->data.p_elst->i_segment_duration[i] );

            MP4_GET8BYTES( p_box->data.p_elst->i_media_time[i] );
        }
        else
        {

            MP4_GET4BYTES( p_box->data.p_elst->i_segment_duration[i] );

            MP4_GET4BYTES( p_box->data.p_elst->i_media_time[i] );
            p_box->data.p_elst->i_media_time[i] = (int32_t)p_box->data.p_elst->i_media_time[i];
        }

        MP4_GET2BYTES( p_box->data.p_elst->i_media_rate_integer[i] );
        MP4_GET2BYTES( p_box->data.p_elst->i_media_rate_fraction[i] );
    }

#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input, "read box: \"elst\" entry-count "I64Fd,
                      i_read / 2 );

#endif
    MP4_READBOX_EXIT( 1 );
}

static void MP4_FreeBox_elst( MP4_Box_t *p_box )
{
    FREE( p_box->data.p_elst->i_segment_duration );
    FREE( p_box->data.p_elst->i_media_time );
    FREE( p_box->data.p_elst->i_media_rate_integer );
    FREE( p_box->data.p_elst->i_media_rate_fraction );
}

static int MP4_ReadBox_cprt( MP4_Stream_t *p_stream, MP4_Box_t *p_box )
{
    unsigned int i_language;
    unsigned int i;

    MP4_READBOX_ENTER( MP4_Box_data_cprt_t );

    MP4_GETVERSIONFLAGS( p_box->data.p_cprt );

    i_language = GetWBE( p_peek );
    for( i = 0; i < 3; i++ )
    {
        p_box->data.p_cprt->i_language[i] =
            ( ( i_language >> ( (2-i)*5 ) )&0x1f ) + 0x60;
    }
    p_peek += 2; i_read -= 2;
    MP4_GETSTRINGZ( p_box->data.p_cprt->psz_notice );

#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input, "read box: \"cprt\" language %c%c%c notice %s",
                      p_box->data.p_cprt->i_language[0],
                      p_box->data.p_cprt->i_language[1],
                      p_box->data.p_cprt->i_language[2],
                      p_box->data.p_cprt->psz_notice );

#endif
    MP4_READBOX_EXIT( 1 );
}

static void MP4_FreeBox_cprt( MP4_Box_t *p_box )
{
    FREE( p_box->data.p_cprt->psz_notice );
}


static int MP4_ReadBox_dcom( MP4_Stream_t *p_stream, MP4_Box_t *p_box )
{
    MP4_READBOX_ENTER( MP4_Box_data_dcom_t );

    MP4_GETFOURCC( p_box->data.p_dcom->i_algorithm );
#ifdef MP4_VERBOSE
    msg_Dbg( p_stream->p_input,