mp4.c

VLC Player Source Code

            }
            break;
        }

        case( VLC_FOURCC( 's', '2', '6', '3' ) ):
            p_track->fmt.i_codec = VLC_FOURCC( 'h', '2', '6', '3' );
            break;

        case( VLC_FOURCC( 't', 'e', 'x', 't' ) ):
        case( VLC_FOURCC( 't', 'x', '3', 'g' ) ):
            p_track->fmt.i_codec = VLC_FOURCC( 's', 'u', 'b', 't' );
            /* FIXME: Not true, could be UTF-16 with a Byte Order Mark (0xfeff) */
            /* FIXME UTF-8 doesn't work here ? */
            if( p_track->b_mac_encoding )
                p_track->fmt.subs.psz_encoding = strdup( "MAC" );
            else
                p_track->fmt.subs.psz_encoding = strdup( "UTF-8" );
            break;

        case VLC_FOURCC('y','v','1','2'):
            p_track->fmt.i_codec = VLC_FOURCC('Y','V','1','2');
            break;
        case VLC_FOURCC('y','u','v','2'):
            p_track->fmt.i_codec = VLC_FOURCC('Y','U','Y','2');
            break;

        case VLC_FOURCC('i','n','2','4'):
            /* in in24/in32 there's enda-atom to tell it's little-endian (if present) */
            if( ( MP4_BoxGet( p_sample, "wave/enda" ) ) ||
                ( MP4_BoxGet( p_sample, "enda" ) ) )
            {
                p_track->fmt.i_codec = VLC_FOURCC('4','2','n','i');
            } else {
                p_track->fmt.i_codec = p_sample->i_type;
            }
            break;

        default:
            p_track->fmt.i_codec = p_sample->i_type;
            break;
    }

    /* now see if esds is present and if so create a data packet
        with decoder_specific_info  */
#define p_decconfig p_esds->data.p_esds->es_descriptor.p_decConfigDescr
    if( ( ( p_esds = MP4_BoxGet( p_sample, "esds" ) ) ||
          ( p_esds = MP4_BoxGet( p_sample, "wave/esds" ) ) )&&
        ( p_esds->data.p_esds )&&
        ( p_decconfig ) )
    {
        /* First update information based on i_objectTypeIndication */
        switch( p_decconfig->i_objectTypeIndication )
        {
            case( 0x20 ): /* MPEG4 VIDEO */
                p_track->fmt.i_codec = VLC_FOURCC( 'm','p','4','v' );
                break;
            case( 0x40):
                p_track->fmt.i_codec = VLC_FOURCC( 'm','p','4','a' );
                break;
            case( 0x60):
            case( 0x61):
            case( 0x62):
            case( 0x63):
            case( 0x64):
            case( 0x65): /* MPEG2 video */
                p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','v' );
                break;
            /* Theses are MPEG2-AAC */
            case( 0x66): /* main profile */
            case( 0x67): /* Low complexity profile */
            case( 0x68): /* Scaleable Sampling rate profile */
                p_track->fmt.i_codec = VLC_FOURCC( 'm','p','4','a' );
                break;
            /* true MPEG 2 audio */
            case( 0x69):
                p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','a' );
                break;
            case( 0x6a): /* MPEG1 video */
                p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','v' );
                break;
            case( 0x6b): /* MPEG1 audio */
                p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','a' );
                break;
            case( 0x6c ): /* jpeg */
                p_track->fmt.i_codec = VLC_FOURCC( 'j','p','e','g' );
                break;
            case( 0x6d ): /* png */
                p_track->fmt.i_codec = VLC_FOURCC( 'p','n','g',' ' );
                break;
            case( 0x6e ): /* jpeg200 */
                p_track->fmt.i_codec = VLC_FOURCC( 'M','J','2','C' );
                break;
            case( 0xa3 ): /* vc1 */
                p_track->fmt.i_codec = VLC_FOURCC( 'W','V','C','1' );
                break;

            /* Private ID */
            case( 0xe0 ): /* NeroDigital: dvd subs */
                if( p_track->fmt.i_cat == SPU_ES )
                {
                    p_track->fmt.i_codec = VLC_FOURCC( 's','p','u',' ' );
                    if( p_track->i_width > 0 )
                        p_track->fmt.subs.spu.i_original_frame_width = p_track->i_width;
                    if( p_track->i_height > 0 )
                        p_track->fmt.subs.spu.i_original_frame_height = p_track->i_height;
                    break;
                }
            case( 0xe1 ): /* QCelp for 3gp */
                if( p_track->fmt.i_cat == AUDIO_ES )
                {
                    p_track->fmt.i_codec = VLC_FOURCC( 'Q','c','l','p' );
                }
                break;

            /* Fallback */
            default:
                /* Unknown entry, but don't touch i_fourcc */
                msg_Warn( p_demux,
                          "unknown objectTypeIndication(0x%x) (Track[ID 0x%x])",
                          p_decconfig->i_objectTypeIndication,
                          p_track->i_track_ID );
                break;
        }
        p_track->fmt.i_extra = p_decconfig->i_decoder_specific_info_len;
        if( p_track->fmt.i_extra > 0 )
        {
            p_track->fmt.p_extra = malloc( p_track->fmt.i_extra );
            memcpy( p_track->fmt.p_extra, p_decconfig->p_decoder_specific_info,
                    p_track->fmt.i_extra );
        }
    }
    else
    {
        switch( p_sample->i_type )
        {
            /* qt decoder, send the complete chunk */
            case VLC_FOURCC ('h', 'd', 'v', '1'): // HDV 720p30
            case VLC_FOURCC ('h', 'd', 'v', '2'): // HDV 1080i60
            case VLC_FOURCC ('h', 'd', 'v', '3'): // HDV 1080i50
            case VLC_FOURCC ('h', 'd', 'v', '5'): // HDV 720p25
            case VLC_FOURCC ('m', 'x', '5', 'n'): // MPEG2 IMX NTSC 525/60 50mb/s produced by FCP
            case VLC_FOURCC ('m', 'x', '5', 'p'): // MPEG2 IMX PAL 625/60 50mb/s produced by FCP
            case VLC_FOURCC ('m', 'x', '4', 'n'): // MPEG2 IMX NTSC 525/60 40mb/s produced by FCP
            case VLC_FOURCC ('m', 'x', '4', 'p'): // MPEG2 IMX PAL 625/60 40mb/s produced by FCP
            case VLC_FOURCC ('m', 'x', '3', 'n'): // MPEG2 IMX NTSC 525/60 30mb/s produced by FCP
            case VLC_FOURCC ('m', 'x', '3', 'p'): // MPEG2 IMX PAL 625/50 30mb/s produced by FCP
            case VLC_FOURCC ('x', 'd', 'v', '2'): // XDCAM HD 1080i60
            case VLC_FOURCC ('A', 'V', 'm', 'p'): // AVID IMX PAL
                p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','v' );
                break;
            /* qt decoder, send the complete chunk */
            case VLC_FOURCC( 'S', 'V', 'Q', '3' ):
            case VLC_FOURCC( 'S', 'V', 'Q', '1' ):
            case VLC_FOURCC( 'V', 'P', '3', '1' ):
            case VLC_FOURCC( '3', 'I', 'V', '1' ):
            case VLC_FOURCC( 'Z', 'y', 'G', 'o' ):
                p_track->fmt.i_extra =
                    p_sample->data.p_sample_vide->i_qt_image_description;
                if( p_track->fmt.i_extra > 0 )
                {
                    p_track->fmt.p_extra = malloc( p_track->fmt.i_extra );
                    memcpy( p_track->fmt.p_extra,
                            p_sample->data.p_sample_vide->p_qt_image_description,
                            p_track->fmt.i_extra);
                }
                break;
            case VLC_FOURCC( 'Q', 'D', 'M', 'C' ):
            case VLC_FOURCC( 'Q', 'D', 'M', '2' ):
            case VLC_FOURCC( 'Q', 'c', 'l', 'p' ):
            case VLC_FOURCC( 's', 'a', 'm', 'r' ):
            case VLC_FOURCC( 'a', 'l', 'a', 'c' ):
                p_track->fmt.i_extra =
                    p_sample->data.p_sample_soun->i_qt_description;
                if( p_track->fmt.i_extra > 0 )
                {
                    p_track->fmt.p_extra = malloc( p_track->fmt.i_extra );
                    memcpy( p_track->fmt.p_extra,
                            p_sample->data.p_sample_soun->p_qt_description,
                            p_track->fmt.i_extra);
                }
                break;

            /* avc1: send avcC (h264 without annexe B, ie without start code)*/
            case VLC_FOURCC( 'a', 'v', 'c', '1' ):
            {
                MP4_Box_t *p_avcC = MP4_BoxGet( p_sample, "avcC" );

                if( p_avcC )
                {
                    p_track->fmt.i_extra = p_avcC->data.p_avcC->i_avcC;
                    p_track->fmt.p_extra = malloc( p_avcC->data.p_avcC->i_avcC );
                    memcpy( p_track->fmt.p_extra, p_avcC->data.p_avcC->p_avcC,
                            p_track->fmt.i_extra );
                }
                else
                {
                    msg_Err( p_demux, "missing avcC" );
                }
                break;
            }

            case VLC_FOURCC('m','s',0x00,0x02):
            case VLC_FOURCC('m','s',0x00,0x11):
                p_track->fmt.audio.i_blockalign = p_sample->data.p_sample_soun->i_bytes_per_frame;
                break;

            default:
                break;
        }
    }

#undef p_decconfig

    /* some last initialisation */
    switch( p_track->fmt.i_cat )
    {
    case VIDEO_ES:
        p_track->fmt.video.i_width = p_sample->data.p_sample_vide->i_width;
        p_track->fmt.video.i_height = p_sample->data.p_sample_vide->i_height;
        p_track->fmt.video.i_bits_per_pixel =
            p_sample->data.p_sample_vide->i_depth;

        /* fall on display size */
        if( p_track->fmt.video.i_width <= 0 )
            p_track->fmt.video.i_width = p_track->i_width;
        if( p_track->fmt.video.i_height <= 0 )
            p_track->fmt.video.i_height = p_track->i_height;

        /* Find out apect ratio from display size */
        if( p_track->i_width > 0 && p_track->i_height > 0 &&
            /* Work-around buggy muxed files */
            p_sample->data.p_sample_vide->i_width != p_track->i_width )
            p_track->fmt.video.i_aspect =
                VOUT_ASPECT_FACTOR * p_track->i_width / p_track->i_height;

        /* Support for cropping (eg. in H263 files) */
        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;

        /* Frame rate */
        p_track->fmt.video.i_frame_rate = p_track->i_timescale;
        p_track->fmt.video.i_frame_rate_base = 1;

        if( p_track->fmt.video.i_frame_rate &&
            (p_box = MP4_BoxGet( p_track->p_stbl, "stts" )) &&
            p_box->data.p_stts->i_entry_count >= 1 )
        {
            p_track->fmt.video.i_frame_rate_base =
                p_box->data.p_stts->i_sample_delta[0];
        }

        break;

    case AUDIO_ES:
        p_track->fmt.audio.i_channels =
            p_sample->data.p_sample_soun->i_channelcount;
        p_track->fmt.audio.i_rate =
            p_sample->data.p_sample_soun->i_sampleratehi;
        p_track->fmt.i_bitrate = p_sample->data.p_sample_soun->i_channelcount *
            p_sample->data.p_sample_soun->i_sampleratehi *
                p_sample->data.p_sample_soun->i_samplesize;
        p_track->fmt.audio.i_bitspersample =
            p_sample->data.p_sample_soun->i_samplesize;

        if( p_track->i_sample_size != 0 &&
            p_sample->data.p_sample_soun->i_qt_version == 1 && p_sample->data.p_sample_soun->i_sample_per_packet <= 0 )
        {
            msg_Err( p_demux, "Invalid sample per packet value for qt_version 1" );
            return VLC_EGENERIC;
        }
        break;

    default:
        break;
    }

    if( pp_es )
        *pp_es = es_out_Add( p_demux->out, &p_track->fmt );

    return VLC_SUCCESS;
}

/* given a time it return sample/chunk
 * it also update elst field of the track
 */
static int TrackTimeToSampleChunk( demux_t *p_demux, mp4_track_t *p_track,
                                   int64_t i_start, uint32_t *pi_chunk,
                                   uint32_t *pi_sample )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    MP4_Box_t   *p_stss;
    uint64_t     i_dts;
    unsigned int i_sample;
    unsigned int i_chunk;
    int          i_index;

    /* FIXME see if it's needed to check p_track->i_chunk_count */
    if( p_track->i_chunk_count == 0 )
        return( VLC_EGENERIC );

    /* handle elst (find the correct one) */
    MP4_TrackSetELST( p_demux, p_track, i_start );
    if( p_track->p_elst && p_track->p_elst->data.p_elst->i_entry_count > 0 )
    {
        MP4_Box_data_elst_t *elst = p_track->p_elst->data.p_elst;
        int64_t i_mvt= i_start * p_sys->i_timescale / (int64_t)1000000;

        /* now calculate i_start for this elst */
        /* offset */
        i_start -= p_track->i_elst_time * INT64_C(1000000) / p_sys->i_timescale;
        if( i_start < 0 )
        {
            *pi_chunk = 0;
            *pi_sample= 0;

            return VLC_SUCCESS;
        }
        /* to track time scale */
        i_start  = i_start * p_track->i_timescale / (int64_t)1000000;
        /* add elst offset */
        if( ( elst->i_media_rate_integer[p_track->i_elst] > 0 ||
             elst->i_media_rate_fraction[p_track->i_elst] > 0 ) &&
            elst->i_media_time[p_track->i_elst] > 0 )
        {
            i_start += elst->i_media_time[p_track->i_elst];
        }

        msg_Dbg( p_demux, "elst (%d) gives %"PRId64"ms (movie)-> %"PRId64
                 "ms (track)", p_track->i_elst,
                 i_mvt * 1000 / p_sys->i_timescale,
                 i_start * 1000 / p_track->i_timescale );
    }
    else
    {
        /* convert absolute time to in timescale unit */
        i_start = i_start * p_track->i_timescale / (int64_t)1000000;
    }

    /* we start from sample 0/chunk 0, hope it won't take too much time */
    /* *** find good chunk *** */
    for( i_chunk = 0; ; i_chunk++ )
    {
        if( i_chunk + 1 >= p_track->i_chunk_count )
        {
            /* at the end and can't check if i_start in this chunk,
               it will be check while searching i_sample */
            i_chunk = p_track->i_chunk_count - 1;
            break;
        }

        if( (uint64_t)i_start >= p_track->chunk[i_chunk].i_first_dts &&
            (uint64_t)i_start <  p_track->chunk[i_chunk + 1].i_first_dts )
        {
            break;
        }
    }

    /* *** find sample in the chunk *** */
    i_sample = p_track->chunk[i_chunk].i_sample_first;
    i_dts    = p_track->chunk[i_chunk].i_first_dts;
    for( i_index = 0; i_sample < p_track->chunk[i_chunk].i_sample_count; )
    {
        if( i_dts +
            p_track->chunk[i_chunk].p_sample_count_dts[i_index] *
            p_track->chunk[i_chunk].p_sample_delta_dts[i_index] < (uint64_t)i_start )
        {
            i_dts    +=
                p_track->chunk[i_chunk].p_sample_count_dts[i_index] *
                p_track->chunk[i_chunk].p_sample_delta_dts[i_index];

            i_sample += p_track->chunk[i_chunk].p_sample_count_dts[i_index];
            i_index++;
        }
        else