modules/demux/rawdv.h

   1 /*****************************************************************************
   2  * rawdv.h : raw DV helpers
   3  *****************************************************************************
   4  * Copyright (C) 2001-2011 VLC authors and VideoLAN
   5  *
   6  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   7  *          Paul Corke <paul dot corke at datatote dot co dot uk>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #define DV_PAL_FRAME_SIZE  (12 * 150 * 80)
  25 #define DV_NTSC_FRAME_SIZE (10 * 150 * 80)
  26
  27
  28 static const uint16_t dv_audio_shuffle525[10][9] = {
  29   {  0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */
  30   {  6, 36, 66, 26, 56, 86, 16, 46, 76 },
  31   { 12, 42, 72,  2, 32, 62, 22, 52, 82 },
  32   { 18, 48, 78,  8, 38, 68, 28, 58, 88 },
  33   { 24, 54, 84, 14, 44, 74,  4, 34, 64 },
  34
  35   {  1, 31, 61, 21, 51, 81, 11, 41, 71 }, /* 2nd channel */
  36   {  7, 37, 67, 27, 57, 87, 17, 47, 77 },
  37   { 13, 43, 73,  3, 33, 63, 23, 53, 83 },
  38   { 19, 49, 79,  9, 39, 69, 29, 59, 89 },
  39   { 25, 55, 85, 15, 45, 75,  5, 35, 65 },
  40 };
  41
  42 static const uint16_t dv_audio_shuffle625[12][9] = {
  43   {   0,  36,  72,  26,  62,  98,  16,  52,  88}, /* 1st channel */
  44   {   6,  42,  78,  32,  68, 104,  22,  58,  94},
  45   {  12,  48,  84,   2,  38,  74,  28,  64, 100},
  46   {  18,  54,  90,   8,  44,  80,  34,  70, 106},
  47   {  24,  60,  96,  14,  50,  86,   4,  40,  76},
  48   {  30,  66, 102,  20,  56,  92,  10,  46,  82},
  49
  50   {   1,  37,  73,  27,  63,  99,  17,  53,  89}, /* 2nd channel */
  51   {   7,  43,  79,  33,  69, 105,  23,  59,  95},
  52   {  13,  49,  85,   3,  39,  75,  29,  65, 101},
  53   {  19,  55,  91,   9,  45,  81,  35,  71, 107},
  54   {  25,  61,  97,  15,  51,  87,   5,  41,  77},
  55   {  31,  67, 103,  21,  57,  93,  11,  47,  83},
  56 };
  57
  58 static inline uint16_t dv_audio_12to16( uint16_t sample )
  59 {
  60     uint16_t shift, result;
  61
  62     sample = (sample < 0x800) ? sample : sample | 0xf000;
  63     shift = (sample & 0xf00) >> 8;
  64
  65     if (shift < 0x2 || shift > 0xd) {
  66         result = sample;
  67     } else if (shift < 0x8) {
  68         shift--;
  69         result = (sample - (256 * shift)) << shift;
  70     } else {
  71         shift = 0xe - shift;
  72         result = ((sample + ((256 * shift) + 1)) << shift) - 1;
  73     }
  74
  75     return result;
  76 }
  77
  78 static inline void dv_get_audio_format( es_format_t *p_fmt,
  79                                         const uint8_t *p_aaux_src )
  80 {
  81     /* 12 bits non-linear will be converted to 16 bits linear */
  82     es_format_Init( p_fmt, AUDIO_ES, VLC_CODEC_S16L );
  83
  84     p_fmt->audio.i_bitspersample = 16;
  85     p_fmt->audio.i_channels = 2;
  86     switch( (p_aaux_src[4-1] >> 3) & 0x07 )
  87     {
  88     case 0:
  89         p_fmt->audio.i_rate = 48000;
  90         break;
  91     case 1:
  92         p_fmt->audio.i_rate = 44100;
  93         break;
  94     case 2:
  95     default:
  96         p_fmt->audio.i_rate = 32000;
  97         break;
  98     }
  99 }
 100
 101 static inline int dv_get_audio_sample_count( const uint8_t *p_buffer, int i_dsf )
 102 {
 103     int i_samples = p_buffer[0] & 0x3f; /* samples in this frame - min samples */
 104     switch( (p_buffer[3] >> 3) & 0x07 )
 105     {
 106     case 0:
 107         return i_samples + (i_dsf ? 1896 : 1580);
 108     case 1:
 109         return i_samples + (i_dsf ? 1742 : 1452);
 110     case 2:
 111     default:
 112         return i_samples + (i_dsf ? 1264 : 1053);
 113     }
 114 }
 115
 116 static inline block_t *dv_extract_audio( block_t *p_frame_block )
 117 {
 118     block_t *p_block;
 119     uint8_t *p_frame, *p_buf;
 120     int i_audio_quant, i_samples, i_half_ch;
 121     const uint16_t (*audio_shuffle)[9];
 122     int i, j, d, of;
 123
 124     if( p_frame_block->i_buffer < 4 )
 125         return NULL;
 126     const int i_dsf = (p_frame_block->p_buffer[3] & 0x80) >> 7;
 127     if( p_frame_block->i_buffer < (i_dsf ? DV_PAL_FRAME_SIZE
 128                                          : DV_NTSC_FRAME_SIZE ) )
 129         return NULL;
 130
 131     /* Beginning of AAUX pack */
 132     p_buf = p_frame_block->p_buffer + 80*6+80*16*3 + 3;
 133     if( *p_buf != 0x50 ) return NULL;
 134
 135     i_audio_quant = p_buf[4] & 0x07; /* 0 - 16bit, 1 - 12bit */
 136     if( i_audio_quant > 1 )
 137         return NULL;
 138
 139     i_samples = dv_get_audio_sample_count( &p_buf[1], i_dsf );
 140
 141     p_block = block_Alloc( 4 * i_samples );
 142
 143     /* for each DIF segment */
 144     p_frame = p_frame_block->p_buffer;
 145     audio_shuffle = i_dsf ? dv_audio_shuffle625 : dv_audio_shuffle525;
 146     i_half_ch = (i_dsf ? 12 : 10)/2;
 147     for( i = 0; i < (i_dsf ? 12 : 10); i++ )
 148     {
 149         p_frame += 6 * 80; /* skip DIF segment header */
 150
 151         if( i_audio_quant == 1 && i == i_half_ch ) break;
 152
 153         for( j = 0; j < 9; j++ )
 154         {
 155             for( d = 8; d < 80; d += 2 )
 156             {
 157                 if( i_audio_quant == 0 )
 158                 {
 159                     /* 16bit quantization */
 160                     of = audio_shuffle[i][j] + (d - 8) / 2 *
 161                            (i_dsf ? 108 : 90);
 162
 163                     if( of * 2 >= 4 * i_samples ) continue;
 164
 165                     /* big endian */
 166                     p_block->p_buffer[of*2] = p_frame[d+1];
 167                     p_block->p_buffer[of*2+1] = p_frame[d];
 168
 169                     if( p_block->p_buffer[of*2+1] == 0x80 &&
 170                         p_block->p_buffer[of*2] == 0x00 )
 171                         p_block->p_buffer[of*2+1] = 0;
 172                 }
 173                 else
 174                 {
 175                     /* 12bit quantization */
 176                     uint16_t lc = (p_frame[d+0] << 4) | (p_frame[d+2] >> 4);
 177                     uint16_t rc = (p_frame[d+1] << 4) | (p_frame[d+2] & 0x0f);
 178
 179                     lc = lc == 0x800 ? 0 : dv_audio_12to16(lc);
 180                     rc = rc == 0x800 ? 0 : dv_audio_12to16(rc);
 181
 182                     of = audio_shuffle[i][j] + (d - 8) / 3 * (i_dsf ? 108 : 90);
 183                     if( of*2 >= 4 * i_samples )
 184                         continue;
 185                     p_block->p_buffer[of*2+0] = lc & 0xff;
 186                     p_block->p_buffer[of*2+1] = lc >> 8;
 187
 188                     of = audio_shuffle[i + i_half_ch][j] + (d - 8) / 3 * (i_dsf ? 108 : 90);
 189                     if( of*2 >= 4 * i_samples )
 190                         continue;
 191                     p_block->p_buffer[of*2+0] = rc & 0xff;
 192                     p_block->p_buffer[of*2+1] = rc >> 8;
 193
 194                     ++d;
 195                 }
 196             }
 197
 198             p_frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
 199         }
 200     }
 201
 202     p_block->i_pts = p_frame_block->i_pts != VLC_TICK_INVALID ? p_frame_block->i_pts
 203                                                            : p_frame_block->i_dts;
 204     p_block->i_dts = p_frame_block->i_dts;
 205     return p_block;
 206 }
 207