rawdv.c

VLC Player Source Code

            p_sys->fmt_audio.audio.i_rate = 48000;
            break;
        case 1:
            p_sys->fmt_audio.audio.i_rate = 44100;
            break;
        case 2:
        default:
            p_sys->fmt_audio.audio.i_rate = 32000;
            break;
        }

        /* 12 bits non-linear will be converted to 16 bits linear */
        p_sys->fmt_audio.audio.i_bitspersample = 16;

        p_sys->p_es_audio = es_out_Add( p_demux->out, &p_sys->fmt_audio );
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * 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;

    var_Destroy( p_demux, "rawdv-hurry-up");
    free( p_sys );
}

/*****************************************************************************
 * Demux: reads and demuxes data packets
 *****************************************************************************
 * 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;
    block_t     *p_block;
    bool  b_audio = false;

    if( p_sys->b_hurry_up )
    {
         /* 3 frames */
        p_sys->i_pcr = mdate() + (p_sys->i_dsf ? 120000 : 90000);
    }

    /* Call the pace control */
    es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr );
    p_block = stream_Block( p_demux->s, p_sys->frame_size );
    if( p_block == NULL )
    {
        /* EOF */
        return 0;
    }

    if( p_sys->p_es_audio )
    {
        es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
                        p_sys->p_es_audio, &b_audio );
    }

    p_block->i_dts =
    p_block->i_pts = p_sys->i_pcr;

    if( b_audio )
    {
        block_t *p_audio_block = dv_extract_audio( p_demux, p_block );
        if( p_audio_block )
        {
            p_audio_block->i_pts =
            p_audio_block->i_dts = p_sys->i_pcr;
            es_out_Send( p_demux->out, p_sys->p_es_audio, p_audio_block );
        }
    }

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

    if( !p_sys->b_hurry_up )
    {
        p_sys->i_pcr += ( INT64_C(1000000) / p_sys->f_rate );
    }

    return 1;
}

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

    /* XXX: DEMUX_SET_TIME is precise here */
    return demux_vaControlHelper( p_demux->s,
                                   0, -1,
                                   p_sys->frame_size * p_sys->f_rate * 8,
                                   p_sys->frame_size, i_query, args );
}

static const uint16_t dv_audio_shuffle525[10][9] = {
  {  0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */
  {  6, 36, 66, 26, 56, 86, 16, 46, 76 },
  { 12, 42, 72,  2, 32, 62, 22, 52, 82 },
  { 18, 48, 78,  8, 38, 68, 28, 58, 88 },
  { 24, 54, 84, 14, 44, 74,  4, 34, 64 },

  {  1, 31, 61, 21, 51, 81, 11, 41, 71 }, /* 2nd channel */
  {  7, 37, 67, 27, 57, 87, 17, 47, 77 },
  { 13, 43, 73,  3, 33, 63, 23, 53, 83 },
  { 19, 49, 79,  9, 39, 69, 29, 59, 89 },
  { 25, 55, 85, 15, 45, 75,  5, 35, 65 },
};

static const uint16_t dv_audio_shuffle625[12][9] = {
  {   0,  36,  72,  26,  62,  98,  16,  52,  88}, /* 1st channel */
  {   6,  42,  78,  32,  68, 104,  22,  58,  94},
  {  12,  48,  84,   2,  38,  74,  28,  64, 100},
  {  18,  54,  90,   8,  44,  80,  34,  70, 106},
  {  24,  60,  96,  14,  50,  86,   4,  40,  76},
  {  30,  66, 102,  20,  56,  92,  10,  46,  82},

  {   1,  37,  73,  27,  63,  99,  17,  53,  89}, /* 2nd channel */
  {   7,  43,  79,  33,  69, 105,  23,  59,  95},
  {  13,  49,  85,   3,  39,  75,  29,  65, 101},
  {  19,  55,  91,   9,  45,  81,  35,  71, 107},
  {  25,  61,  97,  15,  51,  87,   5,  41,  77},
  {  31,  67, 103,  21,  57,  93,  11,  47,  83},
};

static inline uint16_t dv_audio_12to16( uint16_t sample )
{
    uint16_t shift, result;

    sample = (sample < 0x800) ? sample : sample | 0xf000;
    shift = (sample & 0xf00) >> 8;

    if (shift < 0x2 || shift > 0xd) {
        result = sample;
    } else if (shift < 0x8) {
        shift--;
        result = (sample - (256 * shift)) << shift;
    } else {
        shift = 0xe - shift;
        result = ((sample + ((256 * shift) + 1)) << shift) - 1;
    }

    return result;
}

static block_t *dv_extract_audio( demux_t *p_demux,
                                  block_t* p_frame_block )
{
    demux_sys_t *p_sys  = p_demux->p_sys;
    block_t *p_block;
    uint8_t *p_frame, *p_buf;
    int i_audio_quant, i_samples, i_size, i_half_ch;
    const uint16_t (*audio_shuffle)[9];
    int i, j, d, of;
    uint16_t lc;

    /* Beginning of AAUX pack */
    p_buf = p_frame_block->p_buffer + 80*6+80*16*3 + 3;
    if( *p_buf != 0x50 ) return NULL;

    i_audio_quant = p_buf[4] & 0x07; /* 0 - 16bit, 1 - 12bit */
    if( i_audio_quant > 1 )
    {
        msg_Dbg( p_demux, "unsupported quantization for DV audio");
        return NULL;
    }

    i_samples = p_buf[1] & 0x3f; /* samples in this frame - min samples */
    switch( (p_buf[4] >> 3) & 0x07 )
    {
    case 0:
        i_size = p_sys->i_dsf ? 1896 : 1580;
        break;
    case 1:
        i_size = p_sys->i_dsf ? 1742 : 1452;
        break;
    case 2:
    default:
        i_size = p_sys->i_dsf ? 1264 : 1053;
        break;
    }
    i_size = (i_size + i_samples) * 4; /* 2ch, 2bytes */

    p_block = block_New( p_demux, i_size );

    /* for each DIF segment */
    p_frame = p_frame_block->p_buffer;
    audio_shuffle = p_sys->i_dsf ? dv_audio_shuffle625 : dv_audio_shuffle525;
    i_half_ch = (p_sys->i_dsf ? 12 : 10)/2;
    for( i = 0; i < (p_sys->i_dsf ? 12 : 10); i++ )
    {
        p_frame += 6 * 80; /* skip DIF segment header */

        if( i_audio_quant == 1 && i == i_half_ch ) break;

        for( j = 0; j < 9; j++ )
        {
            for( d = 8; d < 80; d += 2 )
            {
                if( i_audio_quant == 0 )
                {
                    /* 16bit quantization */
                    of = audio_shuffle[i][j] + (d - 8) / 2 *
                           (p_sys->i_dsf ? 108 : 90);

                    if( of * 2 >= i_size ) continue;

                    /* big endian */
                    p_block->p_buffer[of*2] = p_frame[d+1];
                    p_block->p_buffer[of*2+1] = p_frame[d];

                    if( p_block->p_buffer[of*2+1] == 0x80 &&
                        p_block->p_buffer[of*2] == 0x00 )
                        p_block->p_buffer[of*2+1] = 0;
                }
                else
                {
                    /* 12bit quantization */
                    lc = ((uint16_t)p_frame[d] << 4) |
                         ((uint16_t)p_frame[d+2] >> 4);
                    lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));

                    of = audio_shuffle[i][j] + (d - 8) / 3 *
                         (p_sys->i_dsf ? 108 : 90);
                    if( of*2 >= i_size ) continue;

                    /* big endian */
                    p_block->p_buffer[of*2] = lc & 0xff;
                    p_block->p_buffer[of*2+1] = lc >> 8;
                    ++d;
                }
            }

            p_frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
        }
    }

    return p_block;
}