wav.c

VLC Player Source Code

             GetWLE( &p_wf->wFormatTag ), (char *)&p_sys->fmt.i_codec,
             p_sys->fmt.audio.i_channels, p_sys->fmt.audio.i_rate,
             p_sys->fmt.i_bitrate / 8 / 1024, p_sys->fmt.audio.i_blockalign,
             p_sys->fmt.audio.i_bitspersample, p_sys->fmt.i_extra );

    free( p_wf );
    p_wf = NULL;

    switch( p_sys->fmt.i_codec )
    {
    case VLC_FOURCC( 'a', 'r', 'a', 'w' ):
    case VLC_FOURCC( 'a', 'f', 'l', 't' ):
    case VLC_FOURCC( 'u', 'l', 'a', 'w' ):
    case VLC_FOURCC( 'a', 'l', 'a', 'w' ):
    case VLC_FOURCC( 'm', 'l', 'a', 'w' ):
    case VLC_FOURCC( 'p', 'c', 'm', ' ' ):
        FrameInfo_PCM( p_demux, &p_sys->i_frame_size,
                       &p_sys->i_frame_samples );
        break;
    case VLC_FOURCC( 'm', 's', 0x00, 0x02 ):
        FrameInfo_MS_ADPCM( p_demux, &p_sys->i_frame_size,
                            &p_sys->i_frame_samples );
        break;
    case VLC_FOURCC( 'm', 's', 0x00, 0x11 ):
        FrameInfo_IMA_ADPCM( p_demux, &p_sys->i_frame_size,
                             &p_sys->i_frame_samples );
        break;
    case VLC_FOURCC( 'm', 's', 0x00, 0x61 ):
    case VLC_FOURCC( 'm', 's', 0x00, 0x62 ):
        /* FIXME not sure at all FIXME */
        FrameInfo_MS_ADPCM( p_demux, &p_sys->i_frame_size,
                            &p_sys->i_frame_samples );
        break;
    case VLC_FOURCC( 'm', 'p', 'g', 'a' ):
    case VLC_FOURCC( 'a', '5', '2', ' ' ):
        /* FIXME set end of area FIXME */
        goto error;
    default:
        msg_Err( p_demux, "unsupported codec (%4.4s)",
                 (char*)&p_sys->fmt.i_codec );
        goto error;
    }

    msg_Dbg( p_demux, "found %s audio format", psz_name );

    if( ChunkFind( p_demux, "data", &p_sys->i_data_size ) )
    {
        msg_Err( p_demux, "cannot find 'data' chunk" );
        goto error;
    }
    stream_Read( p_demux->s, NULL, 8 );   /* Cannot fail */
    p_sys->i_data_pos = stream_Tell( p_demux->s );

    if( p_sys->fmt.i_bitrate <= 0 )
    {
        p_sys->fmt.i_bitrate = (mtime_t)p_sys->i_frame_size *
            p_sys->fmt.audio.i_rate * 8 / p_sys->i_frame_samples;
    }

    p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );

    date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
    date_Set( &p_sys->pts, 1 );

    return VLC_SUCCESS;

error:
    free( p_wf );
    free( p_sys );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * Demux: read packet and send them to decoders
 *****************************************************************************
 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 *****************************************************************************/
static int Demux( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    int64_t     i_pos;
    block_t     *p_block;

    i_pos = stream_Tell( p_demux->s );

    if( p_sys->i_data_size > 0 &&
        i_pos >= p_sys->i_data_pos + p_sys->i_data_size )
    {
        /* EOF */
        return 0;
    }

    if( ( p_block = stream_Block( p_demux->s, p_sys->i_frame_size ) ) == NULL )
    {
        msg_Warn( p_demux, "cannot read data" );
        return 0;
    }

    p_block->i_dts = p_block->i_pts =
        date_Increment( &p_sys->pts, p_sys->i_frame_samples );

    /* set PCR */
    es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );

    /* Do the channel reordering */
    if( p_sys->b_chan_reorder )
        aout_ChannelReorder( p_block->p_buffer, p_block->i_buffer,
                             p_sys->fmt.audio.i_channels,
                             p_sys->pi_chan_table,
                             p_sys->fmt.audio.i_bitspersample );

    es_out_Send( p_demux->out, p_sys->p_es, p_block );

    return 1;
}

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

    free( p_sys );
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
    demux_sys_t *p_sys  = p_demux->p_sys;
    int64_t i_end = -1;

    if( p_sys->i_data_size > 0 )
    {
        i_end = p_sys->i_data_pos + p_sys->i_data_size;
    }

    return demux_vaControlHelper( p_demux->s, p_sys->i_data_pos, i_end,
                                   p_sys->fmt.i_bitrate,
                                   p_sys->fmt.audio.i_blockalign,
                                   i_query, args );
}

/*****************************************************************************
 * Local functions
 *****************************************************************************/
static int ChunkFind( demux_t *p_demux, const char *fcc, unsigned int *pi_size )
{
    const uint8_t *p_peek;

    for( ;; )
    {
        uint32_t i_size;

        if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
        {
            msg_Err( p_demux, "cannot peek" );
            return VLC_EGENERIC;
        }

        i_size = GetDWLE( p_peek + 4 );

        msg_Dbg( p_demux, "chunk: fcc=`%4.4s` size=%"PRIu32, p_peek, i_size );

        if( !memcmp( p_peek, fcc, 4 ) )
        {
            if( pi_size )
            {
                *pi_size = i_size;
            }
            return VLC_SUCCESS;
        }

        /* Skip chunk */
        if( stream_Read( p_demux->s, NULL, 8 ) != 8
         || stream_Read( p_demux->s, NULL, i_size ) != i_size
         || ((i_size & 1) && stream_Read( p_demux->s, NULL, 1 ) != 1 ))
            return VLC_EGENERIC;
    }
}

static void FrameInfo_PCM( demux_t *p_demux, unsigned int *pi_size,
                           int *pi_samples )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    int i_bytes, i_modulo;

    /* read samples for 50ms of */
    *pi_samples = __MAX( p_sys->fmt.audio.i_rate / 20, 1 );

    i_bytes = *pi_samples * p_sys->fmt.audio.i_channels *
        ( (p_sys->fmt.audio.i_bitspersample + 7) / 8 );

    if( p_sys->fmt.audio.i_blockalign > 0 )
    {
        if( ( i_modulo = i_bytes % p_sys->fmt.audio.i_blockalign ) != 0 )
        {
            i_bytes += p_sys->fmt.audio.i_blockalign - i_modulo;
        }
    }

    *pi_size = i_bytes;
}

static void FrameInfo_MS_ADPCM( demux_t *p_demux, unsigned int *pi_size,
                                int *pi_samples )
{
    demux_sys_t *p_sys = p_demux->p_sys;

    *pi_samples = 2 + 2 * ( p_sys->fmt.audio.i_blockalign -
        7 * p_sys->fmt.audio.i_channels ) / p_sys->fmt.audio.i_channels;

    *pi_size = p_sys->fmt.audio.i_blockalign;
}

static void FrameInfo_IMA_ADPCM( demux_t *p_demux, unsigned int *pi_size,
                                 int *pi_samples )
{
    demux_sys_t *p_sys = p_demux->p_sys;

    *pi_samples = 2 * ( p_sys->fmt.audio.i_blockalign -
        4 * p_sys->fmt.audio.i_channels ) / p_sys->fmt.audio.i_channels;

    *pi_size = p_sys->fmt.audio.i_blockalign;
}