araw.c

video linux conference

    msg_Dbg( p_dec, "samplerate:%dHz channels:%d bits/sample:%d",
             p_dec->fmt_in.audio.i_rate, p_dec->fmt_in.audio.i_channels,
             p_dec->fmt_in.audio.i_bitspersample );

    if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', '6', '4' ) )
    {
        p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
        p_dec->fmt_in.audio.i_bitspersample = 64;
    }
    else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', '3', '2' ) )
    {
        p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
        p_dec->fmt_in.audio.i_bitspersample = 32;
    }
    else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '3', '2', 'l' ) ||
             p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '3', '2', 'b' ) )
    {
        p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
        p_dec->fmt_in.audio.i_bitspersample = 32;
    }
    else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '2', '4', 'l' ) ||
             p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '2', '4', 'b' ) )
    {
        p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
        p_dec->fmt_in.audio.i_bitspersample = 24;
    }
    else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '1', '6', 'l' ) ||
             p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '1', '6', 'b' ) )
    {
        p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
        p_dec->fmt_in.audio.i_bitspersample = 16;
    }
    else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '8', ' ', ' ' ) ||
             p_dec->fmt_in.i_codec == VLC_FOURCC( 'u', '8', ' ', ' ' ) )
    {
        p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
        p_dec->fmt_in.audio.i_bitspersample = 8;
    }
    else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'f', 'l', 't' ) )
    {
        switch( ( p_dec->fmt_in.audio.i_bitspersample + 7 ) / 8 )
        {
        case 4:
            p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
            break;
        case 8:
            p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','6','4');
            break;
        default:
            msg_Err( p_dec, "bad parameters(bits/sample)" );
            return VLC_EGENERIC;
        }
    }
    else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'r', 'a', 'w' ) )
    {
        switch( ( p_dec->fmt_in.audio.i_bitspersample + 7 ) / 8 )
        {
        case 1:
            p_dec->fmt_out.i_codec = VLC_FOURCC('u','8',' ',' ');
            break;
        case 2:
            p_dec->fmt_out.i_codec = VLC_FOURCC('s','1','6','l');
            break;
        case 3:
            p_dec->fmt_out.i_codec = VLC_FOURCC('s','2','4','l');
            break;
        case 4:
            p_dec->fmt_out.i_codec = VLC_FOURCC('s','3','2','l');
            break;
        default:
            msg_Err( p_dec, "bad parameters(bits/sample)" );
            return VLC_EGENERIC;
        }
    }
    else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 't', 'w', 'o', 's' ) )
    {
        switch( ( p_dec->fmt_in.audio.i_bitspersample + 7 ) / 8 )
        {
        case 1:
            p_dec->fmt_out.i_codec = VLC_FOURCC('s','8',' ',' ');
            break;
        case 2:
            p_dec->fmt_out.i_codec = VLC_FOURCC('s','1','6','b');
            break;
        case 3:
            p_dec->fmt_out.i_codec = VLC_FOURCC('s','2','4','b');
            break;
        case 4:
            p_dec->fmt_out.i_codec = VLC_FOURCC('s','3','2','b');
            break;
        default:
            msg_Err( p_dec, "bad parameters(bits/sample)" );
            return VLC_EGENERIC;
        }
    }
    else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 's', 'o', 'w', 't' ) )
    {
        switch( ( p_dec->fmt_in.audio.i_bitspersample + 7 ) / 8 )
        {
        case 1:
            p_dec->fmt_out.i_codec = VLC_FOURCC('s','8',' ',' ');
            break;
        case 2:
            p_dec->fmt_out.i_codec = VLC_FOURCC('s','1','6','l');
            break;
        case 3:
            p_dec->fmt_out.i_codec = VLC_FOURCC('s','2','4','l');
            break;
        case 4:
            p_dec->fmt_out.i_codec = VLC_FOURCC('s','3','2','l');
            break;
        default:
            msg_Err( p_dec, "bad parameters(bits/sample)" );
            return VLC_EGENERIC;
        }
    }
    else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'l', 'a', 'w' ) )
    {
        p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
        p_sys->p_logtos16  = alawtos16;
        p_dec->fmt_in.audio.i_bitspersample = 8;
    }
    else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'u', 'l', 'a', 'w' ) ||
             p_dec->fmt_in.i_codec == VLC_FOURCC( 'm', 'l', 'a', 'w' ) )
    {
        p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
        p_sys->p_logtos16  = ulawtos16;
        p_dec->fmt_in.audio.i_bitspersample = 8;
    }

    /* Set output properties */
    p_dec->fmt_out.i_cat = AUDIO_ES;
    p_dec->fmt_out.audio.i_rate = p_dec->fmt_in.audio.i_rate;
    p_dec->fmt_out.audio.i_channels = p_dec->fmt_in.audio.i_channels;
    p_dec->fmt_out.audio.i_bitspersample = p_dec->fmt_in.audio.i_bitspersample;
    p_dec->fmt_out.audio.i_physical_channels =
        p_dec->fmt_out.audio.i_original_channels =
            pi_channels_maps[p_dec->fmt_in.audio.i_channels];
    if( p_dec->fmt_in.audio.i_physical_channels )
        p_dec->fmt_out.audio.i_physical_channels =
            p_dec->fmt_in.audio.i_physical_channels;
    if( p_dec->fmt_in.audio.i_original_channels )
        p_dec->fmt_out.audio.i_original_channels =
            p_dec->fmt_in.audio.i_original_channels;

    if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'l', 'a', 'w' ) ||
        p_dec->fmt_in.i_codec == VLC_FOURCC( 'u', 'l', 'a', 'w' ) ||
        p_dec->fmt_in.i_codec == VLC_FOURCC( 'm', 'l', 'a', 'w' ) )
    {
        p_dec->fmt_out.audio.i_bitspersample = 16;
    }

    aout_DateInit( &p_sys->end_date, p_dec->fmt_out.audio.i_rate );
    aout_DateSet( &p_sys->end_date, 0 );

    p_dec->pf_decode_audio = DecodeBlock;

    return VLC_SUCCESS;
}

/****************************************************************************
 * DecodeBlock: the whole thing
 ****************************************************************************
 * This function must be fed with whole samples (see nBlockAlign).
 ****************************************************************************/
static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    block_t *p_block;
    aout_buffer_t *p_out;
    int i_samples;

    if( !pp_block || !*pp_block ) return NULL;

    p_block = *pp_block;

    if( p_block->i_pts != 0 &&
        p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
    {
        aout_DateSet( &p_sys->end_date, p_block->i_pts );
    }
    else if( !aout_DateGet( &p_sys->end_date ) )
    {
        /* We've just started the stream, wait for the first PTS. */
        block_Release( p_block );
        return NULL;
    }

    /* Don't re-use the same pts twice */
    p_block->i_pts = 0;

    i_samples = p_block->i_buffer * 8 / p_dec->fmt_in.audio.i_bitspersample /
        p_dec->fmt_in.audio.i_channels;

    if( i_samples <= 0 )
    {
        block_Release( p_block );
        return NULL;
    }

    /* Create chunks of max 1024 samples */
    i_samples = __MIN( i_samples, 1024 );

    p_out = p_dec->pf_aout_buffer_new( p_dec, i_samples );
    if( p_out == NULL )
    {
        block_Release( p_block );
        return NULL;
    }

    p_out->start_date = aout_DateGet( &p_sys->end_date );
    p_out->end_date   = aout_DateIncrement( &p_sys->end_date, i_samples );

    if( p_sys->p_logtos16 )
    {
        int16_t *s = (int16_t*)p_out->p_buffer;
        unsigned int i;

        for( i = 0; i < p_out->i_nb_bytes / 2; i++ )
        {
            *s++ = p_sys->p_logtos16[*p_block->p_buffer++];