avi.c

VLC Player Source Code

                                       i, tk->i_samplesize, tk->i_blocksize );
                    tk->i_samplesize = tk->i_blocksize;
                }

                if( tk->i_codec == VLC_FOURCC( 'v', 'o', 'r', 'b' ) )
                {
                    tk->i_blocksize = 0; /* fix vorbis VBR decoding */
                }

                es_format_Init( &fmt, AUDIO_ES, tk->i_codec );

                fmt.audio.i_channels        = p_auds->p_wf->nChannels;
                fmt.audio.i_rate            = p_auds->p_wf->nSamplesPerSec;
                fmt.i_bitrate               = p_auds->p_wf->nAvgBytesPerSec*8;
                fmt.audio.i_blockalign      = p_auds->p_wf->nBlockAlign;
                fmt.audio.i_bitspersample   = p_auds->p_wf->wBitsPerSample;
                fmt.b_packetized            = !tk->i_blocksize;

                msg_Dbg( p_demux,
                    "stream[%d] audio(0x%x) %d channels %dHz %dbits",
                    i, p_auds->p_wf->wFormatTag, p_auds->p_wf->nChannels,
                    p_auds->p_wf->nSamplesPerSec, 
                    p_auds->p_wf->wBitsPerSample );

                fmt.i_extra = __MIN( p_auds->p_wf->cbSize,
                    p_auds->i_chunk_size - sizeof(WAVEFORMATEX) );
                fmt.p_extra = tk->p_extra = malloc( fmt.i_extra );
                if( !fmt.p_extra ) goto error;
                memcpy( fmt.p_extra, &p_auds->p_wf[1], fmt.i_extra );

                /* Rewrite the vorbis headers from Xiph-like format
                 * to VLC internal format
                 *
                 * Xiph format:
                 *  - 1st byte == N, is the number of packets - 1
                 *  - Following bytes are the size of the N first packets:
                 *      while( *p == 0xFF ) { size += 0xFF; p++ } size += *p;
                 *      (the size of the last packet is the size of remaining
                 *      data in the buffer)
                 *  - Finally, all the packets concatenated
                 *
                 * VLC format:
                 *  - Size of the packet on 16 bits (big endian) FIXME: should be 32 bits to be safe
                 *  - The packet itself
                 *  - Size of the next packet, and so on ...
                 */

                if( tk->i_codec == VLC_FOURCC( 'v', 'o', 'r', 'b' ) )
                {
                    uint8_t *p_extra = fmt.p_extra; 
                    size_t i_extra = fmt.i_extra;

                    if( i_extra <= 1 ) break;
                    if( *p_extra++ != 2 ) break; /* 3 packets - 1 = 2 */
                    i_extra--;

                    size_t i_identifier_len = 0;
                    while( *p_extra == 0xFF )
                    {
                        i_identifier_len += 0xFF;
                        p_extra++;
                        if( --i_extra <= 1 ) break;
                    }
                    i_identifier_len += *p_extra++;
                    if( i_identifier_len > --i_extra ) break;

                    size_t i_comment_len = 0;
                    while( *p_extra == 0xFF )
                    {
                        i_comment_len += 0xFF;
                        p_extra++;
                        if( --i_extra <= 1 ) break;
                    }
                    i_comment_len += *p_extra++;
                    if( i_comment_len > --i_extra ) break;
                    size_t i_cookbook_len = i_extra;

                    size_t i_headers_size = 3  * 2 + i_identifier_len +
                                            i_comment_len + i_cookbook_len;
                    uint8_t *p_out = malloc( i_headers_size );
                    if( !p_out ) goto error;
                    free( fmt.p_extra );
                    fmt.p_extra = tk->p_extra = p_out;
                    fmt.i_extra = i_headers_size;
                    #define copy_packet( len ) \
                        *p_out++ = len >> 8; \
                        *p_out++ = len & 0xFF; \
                        memcpy( p_out, p_extra, len ); \
                        p_out += len; \
                        p_extra += len;
                    copy_packet( i_identifier_len );
                    copy_packet( i_comment_len );
                    copy_packet( i_cookbook_len );
                    #undef copy_packet
                    break;
                }
                break;

            case( AVIFOURCC_vids ):
                tk->i_cat   = VIDEO_ES;
                tk->i_codec = AVI_FourccGetCodec( VIDEO_ES,
                                                  p_vids->p_bih->biCompression );
                if( p_vids->p_bih->biCompression == 0x00 )
                {
                    switch( p_vids->p_bih->biBitCount )
                    {
                        case 32:
                            tk->i_codec = VLC_FOURCC('R','V','3','2');
                            break;
                        case 24:
                            tk->i_codec = VLC_FOURCC('R','V','2','4');
                            break;
                        case 16:
                            /* tk->i_codec = VLC_FOURCC('R','V','1','6');*/
                            /* break;*/
                        case 15:
                            tk->i_codec = VLC_FOURCC('R','V','1','5');
                            break;
                        case 9:
                            tk->i_codec = VLC_FOURCC( 'Y', 'V', 'U', '9' ); /* <- TODO check that */
                            break;
                        case 8:
                            tk->i_codec = VLC_FOURCC('Y','8','0','0');
                            break;
                    }
                    es_format_Init( &fmt, VIDEO_ES, tk->i_codec );

                    if( p_vids->p_bih->biBitCount == 24 )
                    {
                        /* This is in BGR format */
                        fmt.video.i_bmask = 0x00ff0000;
                        fmt.video.i_gmask = 0x0000ff00;
                        fmt.video.i_rmask = 0x000000ff;
                    }
                }
                else
                {
                    es_format_Init( &fmt, VIDEO_ES, p_vids->p_bih->biCompression );
                    if( tk->i_codec == FOURCC_mp4v &&
                        !strncasecmp( (char*)&p_strh->i_handler, "XVID", 4 ) )
                    {
                        fmt.i_codec = VLC_FOURCC( 'X', 'V', 'I', 'D' );
                    }
                }
                tk->i_samplesize = 0;
                fmt.video.i_width  = p_vids->p_bih->biWidth;
                fmt.video.i_height = p_vids->p_bih->biHeight;
                fmt.video.i_bits_per_pixel = p_vids->p_bih->biBitCount;
                fmt.video.i_frame_rate = tk->i_rate;
                fmt.video.i_frame_rate_base = tk->i_scale;
                fmt.i_extra =
                    __MIN( p_vids->p_bih->biSize - sizeof( BITMAPINFOHEADER ),
                           p_vids->i_chunk_size - sizeof(BITMAPINFOHEADER) );
                fmt.p_extra = &p_vids->p_bih[1];
                msg_Dbg( p_demux, "stream[%d] video(%4.4s) %"PRIu32"x%"PRIu32" %dbpp %ffps",
                         i, (char*)&p_vids->p_bih->biCompression,
                         (uint32_t)p_vids->p_bih->biWidth,
                         (uint32_t)p_vids->p_bih->biHeight,
                         p_vids->p_bih->biBitCount,
                         (float)tk->i_rate/(float)tk->i_scale );

                if( p_vids->p_bih->biCompression == 0x00 )
                {
                    /* RGB DIB are coded from bottom to top */
                    fmt.video.i_height =
                        (unsigned int)(-(int)p_vids->p_bih->biHeight);
                }

                /* Extract palette from extradata if bpp <= 8
                 * (assumes that extradata contains only palette but appears
                 *  to be true for all palettized codecs we support) */
                if( fmt.i_extra && fmt.video.i_bits_per_pixel <= 8 &&
                    fmt.video.i_bits_per_pixel > 0 )
                {
                    int i;

                    fmt.video.p_palette = calloc( sizeof(video_palette_t), 1 );
                    fmt.video.p_palette->i_entries = 1;

                    /* Apparently this is necessary. But why ? */
                    fmt.i_extra =
                        p_vids->i_chunk_size - sizeof(BITMAPINFOHEADER);
                    for( i = 0; i < __MIN(fmt.i_extra/4, 256); i++ )
                    {
                        ((uint32_t *)&fmt.video.p_palette->palette[0][0])[i] =
                            GetDWLE((uint32_t*)fmt.p_extra + i);
                    }
                }
                break;

            case( AVIFOURCC_txts):
                tk->i_cat   = SPU_ES;
                tk->i_codec = VLC_FOURCC( 's', 'u', 'b', 't' );
                msg_Dbg( p_demux, "stream[%d] subtitles", i );
                es_format_Init( &fmt, SPU_ES, tk->i_codec );
                break;

            case( AVIFOURCC_iavs):
            case( AVIFOURCC_ivas):
                p_sys->b_muxed = true;
                msg_Dbg( p_demux, "stream[%d] iavs with handler %4.4s", i, (char *)&p_strh->i_handler );
                if( p_strh->i_handler == FOURCC_dvsd ||
                    p_strh->i_handler == FOURCC_dvhd ||
                    p_strh->i_handler == FOURCC_dvsl ||
                    p_strh->i_handler == FOURCC_dv25 ||
                    p_strh->i_handler == FOURCC_dv50 )
                {
                    tk->p_out_muxed = stream_DemuxNew( p_demux, (char *)"rawdv", p_demux->out );
                    if( !tk->p_out_muxed )
                        msg_Err( p_demux, "could not load the DV parser" );
                    else break;
                }
                free( tk );
                continue;

            case( AVIFOURCC_mids):
                msg_Dbg( p_demux, "stream[%d] midi is UNSUPPORTED", i );

            default:
                msg_Warn( p_demux, "stream[%d] unknown type %4.4s", i, (char *)&p_strh->i_type );
                free( tk );
                continue;
        }
        if( p_strn )
        {
            /* The charset of p_strn is undefined */
            EnsureUTF8( p_strn->p_str );
            fmt.psz_description = strdup( p_strn->p_str );
        }
        if( tk->p_out_muxed == NULL )
            tk->p_es = es_out_Add( p_demux->out, &fmt );
        TAB_APPEND( p_sys->i_track, p_sys->track, tk );
    }

    if( p_sys->i_track <= 0 )
    {
        msg_Err( p_demux, "no valid track" );
        goto error;
    }

    i_do_index =  config_GetInt( p_demux, "avi-index" );
    if( i_do_index == 1 ) /* Always fix */
    {
aviindex:
        if( p_sys->b_seekable )
        {
            AVI_IndexCreate( p_demux );
        }
        else
        {
            msg_Warn( p_demux, "cannot create index (unseekable stream)" );
            AVI_IndexLoad( p_demux );
        }
    }
    else
    {
        AVI_IndexLoad( p_demux );
    }

    /* *** movie length in sec *** */
    p_sys->i_length = AVI_MovieGetLength( p_demux );
    if( p_sys->i_length < (mtime_t)p_avih->i_totalframes *
                          (mtime_t)p_avih->i_microsecperframe /
                          (mtime_t)1000000 )
    {
        msg_Warn( p_demux, "broken or missing index, 'seek' will be "
                           "approximative or will exhibit strange behavior" );
        if( i_do_index == 0 && !b_index )
        {
            if( !p_sys->b_seekable ) {
                b_index = true;
                goto aviindex;
            }
            int i_create;
            i_create = intf_UserYesNo( p_demux, _("AVI Index") ,
                        _( "This AVI file is broken. Seeking will not "
                        "work correctly.\nDo you want to "
                        "try to repair it?\n\nThis might take a long time." ),
                        _( "Repair" ), _( "Don't repair" ), _( "Cancel") );
            if( i_create == DIALOG_OK_YES )
            {
                b_index = true;
                msg_Dbg( p_demux, "Fixing AVI index" );
                goto aviindex;
            }
            else if( i_create == DIALOG_CANCELLED )
            {
                /* Kill input */
                vlc_object_kill( p_demux->p_parent );
                goto error;
            }
        }
    }

    /* fix some BeOS MediaKit generated file */
    for( i = 0 ; i < p_sys->i_track; i++ )
    {
        avi_track_t         *tk = p_sys->track[i];
        avi_chunk_list_t    *p_strl;
        avi_chunk_strh_t    *p_strh;
        avi_chunk_strf_auds_t    *p_auds;

        if( tk->i_cat != AUDIO_ES )
        {
            continue;
        }
        if( tk->i_idxnb < 1 ||
            tk->i_scale != 1 ||
            tk->i_samplesize != 0 )
        {
            continue;
        }
        p_strl = AVI_ChunkFind( p_hdrl, AVIFOURCC_strl, i );
        p_strh = AVI_ChunkFind( p_strl, AVIFOURCC_strh, 0 );
        p_auds = AVI_ChunkFind( p_strl, AVIFOURCC_strf, 0 );

        if( p_auds->p_wf->wFormatTag != WAVE_FORMAT_PCM &&
            (unsigned int)tk->i_rate == p_auds->p_wf->nSamplesPerSec )
        {
            int64_t i_track_length =
                tk->p_index[tk->i_idxnb-1].i_length +
                tk->p_index[tk->i_idxnb-1].i_lengthtotal;
            mtime_t i_length = (mtime_t)p_avih->i_totalframes *
                               (mtime_t)p_avih->i_microsecperframe;

            if( i_length == 0 )
            {
                msg_Warn( p_demux, "track[%d] cannot be fixed (BeOS MediaKit generated)", i );
                continue;
            }
            tk->i_samplesize = 1;
            tk->i_rate       = i_track_length  * (int64_t)1000000/ i_length;
            msg_Warn( p_demux, "track[%d] fixed with rate=%d scale=%d (BeOS MediaKit generated)", i, tk->i_rate, tk->i_scale );
        }
    }

    if( p_sys->b_seekable )
    {
        /* we have read all chunk so go back to movi */
        stream_Seek( p_demux->s, p_movi->i_chunk_pos );
    }
    /* Skip movi header */
    stream_Read( p_demux->s, NULL, 12 );

    p_sys->i_movi_begin = p_movi->i_chunk_pos;
    return VLC_SUCCESS;

error:
    if( p_sys->meta )
    {
        vlc_meta_Delete( p_sys->meta );
    }
    AVI_ChunkFreeRoot( p_demux->s, &p_sys->ck_root );
    free( p_sys );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * Close: frees unused data
 *****************************************************************************/
static void Close ( vlc_object_t * p_this )
{
    demux_t *    p_demux = (demux_t *)p_this;
    unsigned int i;
    demux_sys_t *p_sys = p_demux->p_sys  ;

    for( i = 0; i < p_sys->i_track; i++ )
    {
        if( p_sys->track[i] )
        {
            if( p_sys->track[i]->p_out_muxed )
                stream_DemuxDelete( p_sys->track[i]->p_out_muxed );
            free( p_sys->track[i]->p_index );
            free( p_sys->track[i]->p_extra );
            free( p_sys->track[i] );
        }
    }
    free( p_sys->track );
    AVI_ChunkFreeRoot( p_demux->s, &p_sys->ck_root );
    vlc_meta_Delete( p_sys->meta );

    free( p_sys );
}

/*****************************************************************************
 * Demux_Seekable: reads and demuxes data packets for stream seekable
 *****************************************************************************
 * AVIDemux: reads and demuxes data packets
 *****************************************************************************
 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 *****************************************************************************/
typedef struct
{
    bool b_ok;

    int i_toread;

    off_t i_posf; /* where we will read :
                   if i_idxposb == 0 : begining of chunk (+8 to acces data)