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FFmpeg/libavcodec/dpcm.c

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  1. /*

  2.  * Assorted DPCM codecs

  3.  * Copyright (c) 2003 The ffmpeg Project.

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /**

  23.  * @file: dpcm.c

  24.  * Assorted DPCM (differential pulse code modulation) audio codecs

  25.  * by Mike Melanson (melanson@pcisys.net)

  26.  * Xan DPCM decoder by Mario Brito (mbrito@student.dei.uc.pt)

  27.  * for more information on the specific data formats, visit:

  28.  *   http://www.pcisys.net/~melanson/codecs/simpleaudio.html

  29.  * SOL DPCMs implemented by Konstantin Shishkov

  30.  *

  31.  * Note about using the Xan DPCM decoder: Xan DPCM is used in AVI files

  32.  * found in the Wing Commander IV computer game. These AVI files contain

  33.  * WAVEFORMAT headers which report the audio format as 0x01: raw PCM.

  34.  * Clearly incorrect. To detect Xan DPCM, you will probably have to

  35.  * special-case your AVI demuxer to use Xan DPCM if the file uses 'Xxan'

  36.  * (Xan video) for its video codec. Alternately, such AVI files also contain

  37.  * the fourcc 'Axan' in the 'auds' chunk of the AVI header.

  38.  */

  39. 

  40. #include "avcodec.h"

  41. 

  42. typedef struct DPCMContext {

  43.     int channels;

  44.     short roq_square_array[256];

  45.     long sample[2];//for SOL_DPCM

  46.     const int *sol_table;//for SOL_DPCM

  47. } DPCMContext;

  48. 

  49. #define SATURATE_S16(x)  if (x < -32768) x = -32768; \

  50.   else if (x > 32767) x = 32767;

  51. #define SE_16BIT(x)  if (x & 0x8000) x -= 0x10000;

  52. 

  53. static int interplay_delta_table[] = {

  54.          0,      1,      2,      3,      4,      5,      6,      7,

  55.          8,      9,     10,     11,     12,     13,     14,     15,

  56.         16,     17,     18,     19,     20,     21,     22,     23,

  57.         24,     25,     26,     27,     28,     29,     30,     31,

  58.         32,     33,     34,     35,     36,     37,     38,     39,

  59.         40,     41,     42,     43,     47,     51,     56,     61,

  60.         66,     72,     79,     86,     94,    102,    112,    122,

  61.        133,    145,    158,    173,    189,    206,    225,    245,

  62.        267,    292,    318,    348,    379,    414,    452,    493,

  63.        538,    587,    640,    699,    763,    832,    908,    991,

  64.       1081,   1180,   1288,   1405,   1534,   1673,   1826,   1993,

  65.       2175,   2373,   2590,   2826,   3084,   3365,   3672,   4008,

  66.       4373,   4772,   5208,   5683,   6202,   6767,   7385,   8059,

  67.       8794,   9597,  10472,  11428,  12471,  13609,  14851,  16206,

  68.      17685,  19298,  21060,  22981,  25078,  27367,  29864,  32589,

  69.     -29973, -26728, -23186, -19322, -15105, -10503,  -5481,     -1,

  70.          1,      1,   5481,  10503,  15105,  19322,  23186,  26728,

  71.      29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298,

  72.     -17685, -16206, -14851, -13609, -12471, -11428, -10472,  -9597,

  73.      -8794,  -8059,  -7385,  -6767,  -6202,  -5683,  -5208,  -4772,

  74.      -4373,  -4008,  -3672,  -3365,  -3084,  -2826,  -2590,  -2373,

  75.      -2175,  -1993,  -1826,  -1673,  -1534,  -1405,  -1288,  -1180,

  76.      -1081,   -991,   -908,   -832,   -763,   -699,   -640,   -587,

  77.       -538,   -493,   -452,   -414,   -379,   -348,   -318,   -292,

  78.       -267,   -245,   -225,   -206,   -189,   -173,   -158,   -145,

  79.       -133,   -122,   -112,   -102,    -94,    -86,    -79,    -72,

  80.        -66,    -61,    -56,    -51,    -47,    -43,    -42,    -41,

  81.        -40,    -39,    -38,    -37,    -36,    -35,    -34,    -33,

  82.        -32,    -31,    -30,    -29,    -28,    -27,    -26,    -25,

  83.        -24,    -23,    -22,    -21,    -20,    -19,    -18,    -17,

  84.        -16,    -15,    -14,    -13,    -12,    -11,    -10,     -9,

  85.         -8,     -7,     -6,     -5,     -4,     -3,     -2,     -1

  86. 

  87. };

  88. 

  89. static const int sol_table_old[16] =

  90.     { 0x0,  0x1,  0x2 , 0x3,  0x6,  0xA,  0xF, 0x15,

  91.     -0x15, -0xF, -0xA, -0x6, -0x3, -0x2, -0x1, 0x0};

  92. 

  93. static const int sol_table_new[16] =

  94.     { 0x0,  0x1,  0x2,  0x3,  0x6,  0xA,  0xF,  0x15,

  95.       0x0, -0x1, -0x2, -0x3, -0x6, -0xA, -0xF, -0x15};

  96. 

  97. static const int sol_table_16[128] = {

  98.     0x000, 0x008, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080,

  99.     0x090, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x110, 0x120,

  100.     0x130, 0x140, 0x150, 0x160, 0x170, 0x180, 0x190, 0x1A0, 0x1B0, 0x1C0,

  101.     0x1D0, 0x1E0, 0x1F0, 0x200, 0x208, 0x210, 0x218, 0x220, 0x228, 0x230,

  102.     0x238, 0x240, 0x248, 0x250, 0x258, 0x260, 0x268, 0x270, 0x278, 0x280,

  103.     0x288, 0x290, 0x298, 0x2A0, 0x2A8, 0x2B0, 0x2B8, 0x2C0, 0x2C8, 0x2D0,

  104.     0x2D8, 0x2E0, 0x2E8, 0x2F0, 0x2F8, 0x300, 0x308, 0x310, 0x318, 0x320,

  105.     0x328, 0x330, 0x338, 0x340, 0x348, 0x350, 0x358, 0x360, 0x368, 0x370,

  106.     0x378, 0x380, 0x388, 0x390, 0x398, 0x3A0, 0x3A8, 0x3B0, 0x3B8, 0x3C0,

  107.     0x3C8, 0x3D0, 0x3D8, 0x3E0, 0x3E8, 0x3F0, 0x3F8, 0x400, 0x440, 0x480,

  108.     0x4C0, 0x500, 0x540, 0x580, 0x5C0, 0x600, 0x640, 0x680, 0x6C0, 0x700,

  109.     0x740, 0x780, 0x7C0, 0x800, 0x900, 0xA00, 0xB00, 0xC00, 0xD00, 0xE00,

  110.     0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000

  111. };

  112. 

  113. 

  114. 

  115. static int dpcm_decode_init(AVCodecContext *avctx)

  116. {

  117.     DPCMContext *s = avctx->priv_data;

  118.     int i;

  119.     short square;

  120. 

  121.     s->channels = avctx->channels;

  122.     s->sample[0] = s->sample[1] = 0;

  123. 

  124.     switch(avctx->codec->id) {

  125. 

  126.     case CODEC_ID_ROQ_DPCM:

  127.         /* initialize square table */

  128.         for (i = 0; i < 128; i++) {

  129.             square = i * i;

  130.             s->roq_square_array[i] = square;

  131.             s->roq_square_array[i + 128] = -square;

  132.         }

  133.         break;

  134. 

  135. 

  136.     case CODEC_ID_SOL_DPCM:

  137.         switch(avctx->codec_tag){

  138.         case 1:

  139.             s->sol_table=sol_table_old;

  140.             s->sample[0] = s->sample[1] = 0x80;

  141.             break;

  142.         case 2:

  143.             s->sol_table=sol_table_new;

  144.             s->sample[0] = s->sample[1] = 0x80;

  145.             break;

  146.         case 3:

  147.             s->sol_table=sol_table_16;

  148.             break;

  149.         default:

  150.             av_log(avctx, AV_LOG_ERROR, "Unknown SOL subcodec\n");

  151.             return -1;

  152.         }

  153.         break;

  154. 

  155.     default:

  156.         break;

  157.     }

  158. 

  159.     return 0;

  160. }

  161. 

  162. static int dpcm_decode_frame(AVCodecContext *avctx,

  163.                              void *data, int *data_size,

  164.                              uint8_t *buf, int buf_size)

  165. {

  166.     DPCMContext *s = avctx->priv_data;

  167.     int in, out = 0;

  168.     int predictor[2];

  169.     int channel_number = 0;

  170.     short *output_samples = data;

  171.     int shift[2];

  172.     unsigned char byte;

  173.     short diff;

  174. 

  175.     if (!buf_size)

  176.         return 0;

  177. 

  178.     switch(avctx->codec->id) {

  179. 

  180.     case CODEC_ID_ROQ_DPCM:

  181.         if (s->channels == 1)

  182.             predictor[0] = AV_RL16(&buf[6]);

  183.         else {

  184.             predictor[0] = buf[7] << 8;

  185.             predictor[1] = buf[6] << 8;

  186.         }

  187.         SE_16BIT(predictor[0]);

  188.         SE_16BIT(predictor[1]);

  189. 

  190.         /* decode the samples */

  191.         for (in = 8, out = 0; in < buf_size; in++, out++) {

  192.             predictor[channel_number] += s->roq_square_array[buf[in]];

  193.             SATURATE_S16(predictor[channel_number]);

  194.             output_samples[out] = predictor[channel_number];

  195. 

  196.             /* toggle channel */

  197.             channel_number ^= s->channels - 1;

  198.         }

  199.         break;

  200. 

  201.     case CODEC_ID_INTERPLAY_DPCM:

  202.         in = 6;  /* skip over the stream mask and stream length */

  203.         predictor[0] = AV_RL16(&buf[in]);

  204.         in += 2;

  205.         SE_16BIT(predictor[0])

  206.         output_samples[out++] = predictor[0];

  207.         if (s->channels == 2) {

  208.             predictor[1] = AV_RL16(&buf[in]);

  209.             in += 2;

  210.             SE_16BIT(predictor[1])

  211.             output_samples[out++] = predictor[1];

  212.         }

  213. 

  214.         while (in < buf_size) {

  215.             predictor[channel_number] += interplay_delta_table[buf[in++]];

  216.             SATURATE_S16(predictor[channel_number]);

  217.             output_samples[out++] = predictor[channel_number];

  218. 

  219.             /* toggle channel */

  220.             channel_number ^= s->channels - 1;

  221.         }

  222. 

  223.         break;

  224. 

  225.     case CODEC_ID_XAN_DPCM:

  226.         in = 0;

  227.         shift[0] = shift[1] = 4;

  228.         predictor[0] = AV_RL16(&buf[in]);

  229.         in += 2;

  230.         SE_16BIT(predictor[0]);

  231.         if (s->channels == 2) {

  232.             predictor[1] = AV_RL16(&buf[in]);

  233.             in += 2;

  234.             SE_16BIT(predictor[1]);

  235.         }

  236. 

  237.         while (in < buf_size) {

  238.             byte = buf[in++];

  239.             diff = (byte & 0xFC) << 8;

  240.             if ((byte & 0x03) == 3)

  241.                 shift[channel_number]++;

  242.             else

  243.                 shift[channel_number] -= (2 * (byte & 3));

  244.             /* saturate the shifter to a lower limit of 0 */

  245.             if (shift[channel_number] < 0)

  246.                 shift[channel_number] = 0;

  247. 

  248.             diff >>= shift[channel_number];

  249.             predictor[channel_number] += diff;

  250. 

  251.             SATURATE_S16(predictor[channel_number]);

  252.             output_samples[out++] = predictor[channel_number];

  253. 

  254.             /* toggle channel */

  255.             channel_number ^= s->channels - 1;

  256.         }

  257.         break;

  258.     case CODEC_ID_SOL_DPCM:

  259.         in = 0;

  260.         if (avctx->codec_tag != 3) {

  261.             while (in < buf_size) {

  262.                 int n1, n2;

  263.                 n1 = (buf[in] >> 4) & 0xF;

  264.                 n2 = buf[in++] & 0xF;

  265.                 s->sample[0] += s->sol_table[n1];

  266.                  if (s->sample[0] < 0) s->sample[0] = 0;

  267.                 if (s->sample[0] > 255) s->sample[0] = 255;

  268.                 output_samples[out++] = (s->sample[0] - 128) << 8;

  269.                 s->sample[s->channels - 1] += s->sol_table[n2];

  270.                 if (s->sample[s->channels - 1] < 0) s->sample[s->channels - 1] = 0;

  271.                 if (s->sample[s->channels - 1] > 255) s->sample[s->channels - 1] = 255;

  272.                 output_samples[out++] = (s->sample[s->channels - 1] - 128) << 8;

  273.             }

  274.         } else {

  275.             while (in < buf_size) {

  276.                 int n;

  277.                 n = buf[in++];

  278.                 if (n & 0x80) s->sample[channel_number] -= s->sol_table[n & 0x7F];

  279.                 else s->sample[channel_number] += s->sol_table[n & 0x7F];

  280.                 SATURATE_S16(s->sample[channel_number]);

  281.                 output_samples[out++] = s->sample[channel_number];

  282.                 /* toggle channel */

  283.                 channel_number ^= s->channels - 1;

  284.             }

  285.         }

  286.         break;

  287.     }

  288. 

  289.     *data_size = out * sizeof(short);

  290.     return buf_size;

  291. }

  292. 

  293. AVCodec roq_dpcm_decoder = {

  294.     "roq_dpcm",

  295.     CODEC_TYPE_AUDIO,

  296.     CODEC_ID_ROQ_DPCM,

  297.     sizeof(DPCMContext),

  298.     dpcm_decode_init,

  299.     NULL,

  300.     NULL,

  301.     dpcm_decode_frame,

  302. };

  303. 

  304. AVCodec interplay_dpcm_decoder = {

  305.     "interplay_dpcm",

  306.     CODEC_TYPE_AUDIO,

  307.     CODEC_ID_INTERPLAY_DPCM,

  308.     sizeof(DPCMContext),

  309.     dpcm_decode_init,

  310.     NULL,

  311.     NULL,

  312.     dpcm_decode_frame,

  313. };

  314. 

  315. AVCodec xan_dpcm_decoder = {

  316.     "xan_dpcm",

  317.     CODEC_TYPE_AUDIO,

  318.     CODEC_ID_XAN_DPCM,

  319.     sizeof(DPCMContext),

  320.     dpcm_decode_init,

  321.     NULL,

  322.     NULL,

  323.     dpcm_decode_frame,

  324. };

  325. 

  326. AVCodec sol_dpcm_decoder = {

  327.     "sol_dpcm",

  328.     CODEC_TYPE_AUDIO,

  329.     CODEC_ID_SOL_DPCM,

  330.     sizeof(DPCMContext),

  331.     dpcm_decode_init,

  332.     NULL,

  333.     NULL,

  334.     dpcm_decode_frame,

  335. };