ogg.c

VLC Player Source Code

    if( !b_selected )
    {
        /* This stream isn't currently selected so we don't need to decode it,
         * but we did need to store its pcr as it might be selected later on */
        return;
    }

    if( p_oggpacket->bytes <= 0 )
        return;

    if( !( p_block = block_New( p_demux, p_oggpacket->bytes ) ) ) return;

    /* Normalize PTS */
    if( i_pts == 0 ) i_pts = 1;
    else if( i_pts == -1 && i_interpolated_pts == 0 ) i_pts = 1;
    else if( i_pts == -1 ) i_pts = 0;

    if( p_stream->fmt.i_cat == AUDIO_ES )
        p_block->i_dts = p_block->i_pts = i_pts;
    else if( p_stream->fmt.i_cat == SPU_ES )
    {
        p_block->i_dts = p_block->i_pts = i_pts;
        p_block->i_length = 0;
    }
    else if( p_stream->fmt.i_codec == VLC_FOURCC( 't','h','e','o' ) )
        p_block->i_dts = p_block->i_pts = i_pts;
    else if( p_stream->fmt.i_codec == VLC_FOURCC( 'd','r','a','c' ) )
    {
        ogg_int64_t dts = p_oggpacket->granulepos >> 31;
        ogg_int64_t delay = (p_oggpacket->granulepos >> 9) & 0x1fff;

        uint64_t u_pnum = dts + delay;

        p_block->i_dts = p_stream->i_pcr;
        p_block->i_pts = 0;
        /* NB, OggDirac granulepos values are in units of 2*picturerate */
        if( -1 != p_oggpacket->granulepos )
            p_block->i_pts = u_pnum * INT64_C(1000000) / p_stream->f_rate / 2;
    }
    else
    {
        p_block->i_dts = i_pts;
        p_block->i_pts = 0;
    }

    if( p_stream->fmt.i_codec != VLC_FOURCC( 'v','o','r','b' ) &&
        p_stream->fmt.i_codec != VLC_FOURCC( 's','p','x',' ' ) &&
        p_stream->fmt.i_codec != VLC_FOURCC( 'f','l','a','c' ) &&
        p_stream->fmt.i_codec != VLC_FOURCC( 't','a','r','k' ) &&
        p_stream->fmt.i_codec != VLC_FOURCC( 't','h','e','o' ) &&
        p_stream->fmt.i_codec != VLC_FOURCC( 'c','m','m','l' ) &&
        p_stream->fmt.i_codec != VLC_FOURCC( 'd','r','a','c' ) &&
        p_stream->fmt.i_codec != VLC_FOURCC( 'k','a','t','e' ) )
    {
        /* We remove the header from the packet */
        i_header_len = (*p_oggpacket->packet & PACKET_LEN_BITS01) >> 6;
        i_header_len |= (*p_oggpacket->packet & PACKET_LEN_BITS2) << 1;

        if( p_stream->fmt.i_codec == VLC_FOURCC( 's','u','b','t' ))
        {
            /* But with subtitles we need to retrieve the duration first */
            int i, lenbytes = 0;

            if( i_header_len > 0 && p_oggpacket->bytes >= i_header_len + 1 )
            {
                for( i = 0, lenbytes = 0; i < i_header_len; i++ )
                {
                    lenbytes = lenbytes << 8;
                    lenbytes += *(p_oggpacket->packet + i_header_len - i);
                }
            }
            if( p_oggpacket->bytes - 1 - i_header_len > 2 ||
                ( p_oggpacket->packet[i_header_len + 1] != ' ' &&
                  p_oggpacket->packet[i_header_len + 1] != 0 &&
                  p_oggpacket->packet[i_header_len + 1] != '\n' &&
                  p_oggpacket->packet[i_header_len + 1] != '\r' ) )
            {
                p_block->i_length = (mtime_t)lenbytes * 1000;
            }
        }

        i_header_len++;
        if( p_block->i_buffer >= (unsigned int)i_header_len )
            p_block->i_buffer -= i_header_len;
        else
            p_block->i_buffer = 0;
    }

    if( p_stream->fmt.i_codec == VLC_FOURCC( 't','a','r','k' ) )
    {
        /* FIXME: the biggest hack I've ever done */
        msg_Warn( p_demux, "tarkin pts: %"PRId64", granule: %"PRId64,
                  p_block->i_pts, p_block->i_dts );
        msleep(10000);
    }

    memcpy( p_block->p_buffer, p_oggpacket->packet + i_header_len,
            p_oggpacket->bytes - i_header_len );

    es_out_Send( p_demux->out, p_stream->p_es, p_block );
}

/****************************************************************************
 * Ogg_FindLogicalStreams: Find the logical streams embedded in the physical
 *                         stream and fill p_ogg.
 *****************************************************************************
 * The initial page of a logical stream is marked as a 'bos' page.
 * Furthermore, the Ogg specification mandates that grouped bitstreams begin
 * together and all of the initial pages must appear before any data pages.
 *
 * On success this function returns VLC_SUCCESS.
 ****************************************************************************/
static int Ogg_FindLogicalStreams( demux_t *p_demux )
{
    demux_sys_t *p_ogg = p_demux->p_sys  ;
    ogg_packet oggpacket;
    ogg_page oggpage;
    int i_stream;

#define p_stream p_ogg->pp_stream[p_ogg->i_streams - 1]

    while( Ogg_ReadPage( p_demux, &oggpage ) == VLC_SUCCESS )
    {
        if( ogg_page_bos( &oggpage ) )
        {

            /* All is wonderful in our fine fine little world.
             * We found the beginning of our first logical stream. */
            while( ogg_page_bos( &oggpage ) )
            {
                logical_stream_t **pp_sav = p_ogg->pp_stream;

                p_ogg->i_streams++;
                p_ogg->pp_stream =
                    realloc( p_ogg->pp_stream, p_ogg->i_streams *
                             sizeof(logical_stream_t *) );
                if( !p_ogg->pp_stream )
                {
                    p_ogg->pp_stream = pp_sav;
                    p_ogg->i_streams--;
                    return VLC_ENOMEM;
                }

                p_stream = malloc( sizeof(logical_stream_t) );
                if( !p_stream )
                    return VLC_ENOMEM;
                memset( p_stream, 0, sizeof(logical_stream_t) );
                p_stream->p_headers = 0;
                p_stream->secondary_header_packets = 0;

                es_format_Init( &p_stream->fmt, 0, 0 );
                es_format_Init( &p_stream->fmt_old, 0, 0 );

                /* Setup the logical stream */
                p_stream->i_serial_no = ogg_page_serialno( &oggpage );
                ogg_stream_init( &p_stream->os, p_stream->i_serial_no );

                /* Extract the initial header from the first page and verify
                 * the codec type of tis Ogg bitstream */
                if( ogg_stream_pagein( &p_stream->os, &oggpage ) < 0 )
                {
                    /* error. stream version mismatch perhaps */
                    msg_Err( p_demux, "error reading first page of "
                             "Ogg bitstream data" );
                    return VLC_EGENERIC;
                }

                /* FIXME: check return value */
                ogg_stream_packetpeek( &p_stream->os, &oggpacket );

                /* Check for Vorbis header */
                if( oggpacket.bytes >= 7 &&
                    ! memcmp( oggpacket.packet, "\x01vorbis", 7 ) )
                {
                    Ogg_ReadVorbisHeader( p_stream, &oggpacket );
                    msg_Dbg( p_demux, "found vorbis header" );
                }
                /* Check for Speex header */
                else if( oggpacket.bytes >= 5 &&
                    ! memcmp( oggpacket.packet, "Speex", 5 ) )
                {
                    Ogg_ReadSpeexHeader( p_stream, &oggpacket );
                    msg_Dbg( p_demux, "found speex header, channels: %i, "
                             "rate: %i,  bitrate: %i",
                             p_stream->fmt.audio.i_channels,
                             (int)p_stream->f_rate, p_stream->fmt.i_bitrate );
                }
                /* Check for Flac header (< version 1.1.1) */
                else if( oggpacket.bytes >= 4 &&
                    ! memcmp( oggpacket.packet, "fLaC", 4 ) )
                {
                    msg_Dbg( p_demux, "found FLAC header" );

                    /* Grrrr!!!! Did they really have to put all the
                     * important info in the second header packet!!!
                     * (STREAMINFO metadata is in the following packet) */
                    p_stream->b_force_backup = 1;

                    p_stream->fmt.i_cat = AUDIO_ES;
                    p_stream->fmt.i_codec = VLC_FOURCC( 'f','l','a','c' );
                }
                /* Check for Flac header (>= version 1.1.1) */
                else if( oggpacket.bytes >= 13 && oggpacket.packet[0] ==0x7F &&
                    ! memcmp( &oggpacket.packet[1], "FLAC", 4 ) &&
                    ! memcmp( &oggpacket.packet[9], "fLaC", 4 ) )
                {
                    int i_packets = ((int)oggpacket.packet[7]) << 8 |
                        oggpacket.packet[8];
                    msg_Dbg( p_demux, "found FLAC header version %i.%i "
                             "(%i header packets)",
                             oggpacket.packet[5], oggpacket.packet[6],
                             i_packets );

                    p_stream->b_force_backup = 1;

                    p_stream->fmt.i_cat = AUDIO_ES;
                    p_stream->fmt.i_codec = VLC_FOURCC( 'f','l','a','c' );
                    oggpacket.packet += 13; oggpacket.bytes -= 13;
                    Ogg_ReadFlacHeader( p_demux, p_stream, &oggpacket );
                }
                /* Check for Theora header */
                else if( oggpacket.bytes >= 7 &&
                         ! memcmp( oggpacket.packet, "\x80theora", 7 ) )
                {
                    Ogg_ReadTheoraHeader( p_stream, &oggpacket );

                    msg_Dbg( p_demux,
                             "found theora header, bitrate: %i, rate: %f",
                             p_stream->fmt.i_bitrate, p_stream->f_rate );
                }
                /* Check for Dirac header */
                else if( oggpacket.bytes >= 5 &&
                         ! memcmp( oggpacket.packet, "BBCD\x00", 5 ) )
                {
                    Ogg_ReadDiracHeader( p_stream, &oggpacket );
                    msg_Dbg( p_demux, "found dirac header" );
                }
                /* Check for Tarkin header */
                else if( oggpacket.bytes >= 7 &&
                         ! memcmp( &oggpacket.packet[1], "tarkin", 6 ) )
                {
                    oggpack_buffer opb;

                    msg_Dbg( p_demux, "found tarkin header" );
                    p_stream->fmt.i_cat = VIDEO_ES;
                    p_stream->fmt.i_codec = VLC_FOURCC( 't','a','r','k' );

                    /* Cheat and get additionnal info ;) */
                    oggpack_readinit( &opb, oggpacket.packet, oggpacket.bytes);
                    oggpack_adv( &opb, 88 );
                    oggpack_adv( &opb, 104 );
                    p_stream->fmt.i_bitrate = oggpack_read( &opb, 32 );
                    p_stream->f_rate = 2; /* FIXME */
                    msg_Dbg( p_demux,
                             "found tarkin header, bitrate: %i, rate: %f",
                             p_stream->fmt.i_bitrate, p_stream->f_rate );
                }
                /* Check for Annodex header */
                else if( oggpacket.bytes >= 7 &&
                         ! memcmp( oggpacket.packet, "Annodex", 7 ) )
                {
                    Ogg_ReadAnnodexHeader( VLC_OBJECT(p_demux), p_stream,
                                           &oggpacket );
                    /* kill annodex track */
                    free( p_stream );
                    p_ogg->i_streams--;
                }
                /* Check for Annodex header */
                else if( oggpacket.bytes >= 7 &&
                         ! memcmp( oggpacket.packet, "AnxData", 7 ) )
                {
                    Ogg_ReadAnnodexHeader( VLC_OBJECT(p_demux), p_stream,
                                           &oggpacket );
                }
                /* Check for Kate header */
                else if( oggpacket.bytes >= 8 &&
                    ! memcmp( &oggpacket.packet[1], "kate\0\0\0", 7 ) )
                {
                    Ogg_ReadKateHeader( p_stream, &oggpacket );
                    msg_Dbg( p_demux, "found kate header" );
                }
                else if( oggpacket.bytes >= 142 &&
                         !memcmp( &oggpacket.packet[1],
                                   "Direct Show Samples embedded in Ogg", 35 ))
                {
                    /* Old header type */

                    /* Check for video header (old format) */
                    if( GetDWLE((oggpacket.packet+96)) == 0x05589f80 &&
                        oggpacket.bytes >= 184 )
                    {
                        p_stream->fmt.i_cat = VIDEO_ES;
                        p_stream->fmt.i_codec =
                            VLC_FOURCC( oggpacket.packet[68],
                                        oggpacket.packet[69],
                                        oggpacket.packet[70],
                                        oggpacket.packet[71] );
                        msg_Dbg( p_demux, "found video header of type: %.4s",
                                 (char *)&p_stream->fmt.i_codec );

                        p_stream->fmt.video.i_frame_rate = 10000000;
                        p_stream->fmt.video.i_frame_rate_base =
                            GetQWLE((oggpacket.packet+164));
                        p_stream->f_rate = 10000000.0 /
                            GetQWLE((oggpacket.packet+164));
                        p_stream->fmt.video.i_bits_per_pixel =
                            GetWLE((oggpacket.packet+182));
                        if( !p_stream->fmt.video.i_bits_per_pixel )
                            /* hack, FIXME */
                            p_stream->fmt.video.i_bits_per_pixel = 24;
                        p_stream->fmt.video.i_width =
                            GetDWLE((oggpacket.packet+176));
                        p_stream->fmt.video.i_height =
                            GetDWLE((oggpacket.packet+180));

                        msg_Dbg( p_demux,
                                 "fps: %f, width:%i; height:%i, bitcount:%i",
                                 p_stream->f_rate,
                                 p_stream->fmt.video.i_width,
                                 p_stream->fmt.video.i_height,
                                 p_stream->fmt.video.i_bits_per_pixel);

                    }
                    /* Check for audio header (old format) */
                    else if( GetDWLE((oggpacket.packet+96)) == 0x05589F81 )
                    {
                        unsigned int i_extra_size;
                        unsigned int i_format_tag;

                        p_stream->fmt.i_cat = AUDIO_ES;

                        i_extra_size = GetWLE((oggpacket.packet+140));
                        if( i_extra_size > 0 && i_extra_size < oggpacket.bytes - 142 )
                        {
                            p_stream->fmt.i_extra = i_extra_size;
                            p_stream->fmt.p_extra = malloc( i_extra_size );
                            if( p_stream->fmt.p_extra )
                                memcpy( p_stream->fmt.p_extra,
                                        oggpacket.packet + 142, i_extra_size );
                            else
                                p_stream->fmt.i_extra = 0;
                        }

                        i_format_tag = GetWLE((oggpacket.packet+124));
                        p_stream->fmt.audio.i_channels =
                            GetWLE((oggpacket.packet+126));
                        p_stream->f_rate = p_stream->fmt.audio.i_rate =
                            GetDWLE((oggpacket.packet+128));