-fPIC compileable
[libav.git] / libavcodec / adpcm.c
CommitLineData
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1/*
2 * ADPCM codecs
3 * Copyright (c) 2001 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19#include "avcodec.h"
20
21/*
22 * First version by Francois Revol revol@free.fr
23 *
24 * Features and limitations:
25 *
26 * Reference documents:
27 * http://www.pcisys.net/~melanson/codecs/adpcm.txt
28 * http://www.geocities.com/SiliconValley/8682/aud3.txt
29 * http://openquicktime.sourceforge.net/plugins.htm
30 * XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html
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31 * http://www.cs.ucla.edu/~leec/mediabench/applications.html
32 * SoX source code http://home.sprynet.com/~cbagwell/sox.html
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33 */
34
35#define BLKSIZE 1024
36
37#define CLAMP_TO_SHORT(value) \
38if (value > 32767) \
39 value = 32767; \
40else if (value < -32768) \
41 value = -32768; \
42
43/* step_table[] and index_table[] are from the ADPCM reference source */
44/* This is the index table: */
45static int index_table[16] = {
46 -1, -1, -1, -1, 2, 4, 6, 8,
47 -1, -1, -1, -1, 2, 4, 6, 8,
48};
49
50/* This is the step table. Note that many programs use slight deviations from
51 * this table, but such deviations are negligible:
52 */
53static int step_table[89] = {
54 7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
55 19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
56 50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
57 130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
58 337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
59 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
60 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
61 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
62 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
63};
64
889c5224 65/* Those are for MS-ADPCM */
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66/* AdaptationTable[], AdaptCoeff1[], and AdaptCoeff2[] are from libsndfile */
67static int AdaptationTable[] = {
68 230, 230, 230, 230, 307, 409, 512, 614,
69 768, 614, 512, 409, 307, 230, 230, 230
70};
71
72static int AdaptCoeff1[] = {
73 256, 512, 0, 192, 240, 460, 392
74};
75
76static int AdaptCoeff2[] = {
77 0, -256, 0, 64, 0, -208, -232
78};
79
80/* end of tables */
81
82typedef struct ADPCMChannelStatus {
83 int predictor;
84 short int step_index;
85 int step;
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86 /* for encoding */
87 int prev_sample;
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88
89 /* MS version */
90 short sample1;
91 short sample2;
92 int coeff1;
93 int coeff2;
94 int idelta;
95} ADPCMChannelStatus;
96
97typedef struct ADPCMContext {
98 int channel; /* for stereo MOVs, decode left, then decode right, then tell it's decoded */
99 ADPCMChannelStatus status[2];
100 short sample_buffer[32]; /* hold left samples while waiting for right samples */
101} ADPCMContext;
102
103/* XXX: implement encoding */
104
105static int adpcm_encode_init(AVCodecContext *avctx)
106{
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107 if (avctx->channels > 2)
108 return -1; /* only stereo or mono =) */
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109 switch(avctx->codec->id) {
110 case CODEC_ID_ADPCM_IMA_QT:
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111 fprintf(stderr, "ADPCM: codec admcp_ima_qt unsupported for encoding !\n");
112 avctx->frame_size = 64; /* XXX: can multiple of avctx->channels * 64 (left and right blocks are interleaved) */
113 return -1;
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114 break;
115 case CODEC_ID_ADPCM_IMA_WAV:
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116 avctx->frame_size = (BLKSIZE - 4 * avctx->channels) * 8 / (4 * avctx->channels) + 1; /* each 16 bits sample gives one nibble */
117 /* and we have 4 bytes per channel overhead */
118 avctx->block_align = BLKSIZE;
119 /* seems frame_size isn't taken into account... have to buffer the samples :-( */
120 break;
121 case CODEC_ID_ADPCM_MS:
122 fprintf(stderr, "ADPCM: codec admcp_ms unsupported for encoding !\n");
123 return -1;
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124 break;
125 default:
889c5224 126 return -1;
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127 break;
128 }
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129
130 avctx->coded_frame= avcodec_alloc_frame();
131 avctx->coded_frame->key_frame= 1;
132
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133 return 0;
134}
135
136static int adpcm_encode_close(AVCodecContext *avctx)
137{
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138 av_freep(&avctx->coded_frame);
139
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140 return 0;
141}
142
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143
144static inline unsigned char adpcm_ima_compress_sample(ADPCMChannelStatus *c, short sample)
145{
146 int step_index;
147 unsigned char nibble;
148
149 int sign = 0; /* sign bit of the nibble (MSB) */
150 int delta, predicted_delta;
151
152 delta = sample - c->prev_sample;
153
154 if (delta < 0) {
155 sign = 1;
156 delta = -delta;
157 }
158
159 step_index = c->step_index;
160
161 /* nibble = 4 * delta / step_table[step_index]; */
162 nibble = (delta << 2) / step_table[step_index];
163
164 if (nibble > 7)
165 nibble = 7;
166
167 step_index += index_table[nibble];
168 if (step_index < 0)
169 step_index = 0;
170 if (step_index > 88)
171 step_index = 88;
172
173 /* what the decoder will find */
174 predicted_delta = ((step_table[step_index] * nibble) / 4) + (step_table[step_index] / 8);
175
176 if (sign)
177 c->prev_sample -= predicted_delta;
178 else
179 c->prev_sample += predicted_delta;
180
181 CLAMP_TO_SHORT(c->prev_sample);
182
183
184 nibble += sign << 3; /* sign * 8 */
185
186 /* save back */
187 c->step_index = step_index;
188
189 return nibble;
190}
191
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192static int adpcm_encode_frame(AVCodecContext *avctx,
193 unsigned char *frame, int buf_size, void *data)
194{
889c5224 195 int n;
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196 short *samples;
197 unsigned char *dst;
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198 ADPCMContext *c = avctx->priv_data;
199
200 dst = frame;
201 samples = (short *)data;
202/* n = (BLKSIZE - 4 * avctx->channels) / (2 * 8 * avctx->channels); */
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203
204 switch(avctx->codec->id) {
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205 case CODEC_ID_ADPCM_IMA_QT: /* XXX: can't test until we get .mov writer */
206 break;
207 case CODEC_ID_ADPCM_IMA_WAV:
208 n = avctx->frame_size / 8;
209 c->status[0].prev_sample = (signed short)samples[0]; /* XXX */
210/* c->status[0].step_index = 0; *//* XXX: not sure how to init the state machine */
211 *dst++ = (c->status[0].prev_sample) & 0xFF; /* little endian */
212 *dst++ = (c->status[0].prev_sample >> 8) & 0xFF;
213 *dst++ = (unsigned char)c->status[0].step_index;
214 *dst++ = 0; /* unknown */
215 samples++;
216 if (avctx->channels == 2) {
217 c->status[1].prev_sample = (signed short)samples[0];
218/* c->status[1].step_index = 0; */
219 *dst++ = (c->status[1].prev_sample) & 0xFF;
220 *dst++ = (c->status[1].prev_sample >> 8) & 0xFF;
221 *dst++ = (unsigned char)c->status[1].step_index;
222 *dst++ = 0;
223 samples++;
224 }
225
226 /* stereo: 4 bytes (8 samples) for left, 4 bytes for right, 4 bytes left, ... */
227 for (; n>0; n--) {
228 *dst = adpcm_ima_compress_sample(&c->status[0], samples[0]) & 0x0F;
229 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels]) << 4) & 0xF0;
230 dst++;
231 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 2]) & 0x0F;
232 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 3]) << 4) & 0xF0;
233 dst++;
234 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 4]) & 0x0F;
235 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 5]) << 4) & 0xF0;
236 dst++;
237 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 6]) & 0x0F;
238 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 7]) << 4) & 0xF0;
239 dst++;
240 /* right channel */
241 if (avctx->channels == 2) {
242 *dst = adpcm_ima_compress_sample(&c->status[1], samples[1]);
243 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[3]) << 4;
244 dst++;
245 *dst = adpcm_ima_compress_sample(&c->status[1], samples[5]);
246 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[7]) << 4;
247 dst++;
248 *dst = adpcm_ima_compress_sample(&c->status[1], samples[9]);
249 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[11]) << 4;
250 dst++;
251 *dst = adpcm_ima_compress_sample(&c->status[1], samples[13]);
252 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[15]) << 4;
253 dst++;
254 }
255 samples += 8 * avctx->channels;
256 }
257 break;
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258 default:
259 return -1;
260 }
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261 return dst - frame;
262}
263
264static int adpcm_decode_init(AVCodecContext * avctx)
265{
266 ADPCMContext *c = avctx->priv_data;
267
268 c->channel = 0;
269 c->status[0].predictor = c->status[1].predictor = 0;
270 c->status[0].step_index = c->status[1].step_index = 0;
271 c->status[0].step = c->status[1].step = 0;
272
273 switch(avctx->codec->id) {
274 default:
275 break;
276 }
277 return 0;
278}
279
280static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble)
281{
282 int step_index;
283 int predictor;
284 int sign, delta, diff, step;
285
286 predictor = c->predictor;
287 step_index = c->step_index + index_table[(unsigned)nibble];
288 if (step_index < 0) step_index = 0;
289 if (step_index > 88) step_index = 88;
290
291 step = c->step;
292
293/*
294 diff = ((signed)((nibble & 0x08)?(nibble | 0xF0):(nibble)) + 0.5) * step / 4;
295 predictor += diff;
296*/
297 sign = nibble & 8;
298 delta = nibble & 7;
299 diff = step >> 3;
300 if (delta & 4) diff += step;
301 if (delta & 2) diff += step >> 1;
302 if (delta & 1) diff += step >> 2;
303 if (sign) predictor -= diff;
304 else predictor += diff;
305
306 CLAMP_TO_SHORT(predictor);
307 c->predictor = predictor;
308 c->step_index = step_index;
309 c->step = step_table[step_index];
310
311 return (short)predictor;
312}
313
314static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
315{
316 int predictor;
317
318 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
319 predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
320 CLAMP_TO_SHORT(predictor);
321
322 c->sample2 = c->sample1;
323 c->sample1 = predictor;
324 c->idelta = (AdaptationTable[(int)nibble] * c->idelta) / 256;
325 if (c->idelta < 16) c->idelta = 16;
326
327 return (short)predictor;
328}
329
330static int adpcm_decode_frame(AVCodecContext *avctx,
331 void *data, int *data_size,
332 UINT8 *buf, int buf_size)
333{
334 ADPCMContext *c = avctx->priv_data;
335 ADPCMChannelStatus *cs;
336 int n, m, channel;
337 int block_predictor[2];
338 short *samples;
339 UINT8 *src;
340 int st; /* stereo */
341
342 samples = data;
343 src = buf;
344
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345 st = avctx->channels == 2;
346
347 switch(avctx->codec->id) {
348 case CODEC_ID_ADPCM_IMA_QT:
349 n = (buf_size - 2);/* >> 2*avctx->channels;*/
350 channel = c->channel;
351 cs = &(c->status[channel]);
352 /* (pppppp) (piiiiiii) */
353
354 /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
355 cs->predictor = (*src++) << 8;
356 cs->predictor |= (*src & 0x80);
357 cs->predictor &= 0xFF80;
358
359 /* sign extension */
360 if(cs->predictor & 0x8000)
361 cs->predictor -= 0x10000;
362
363 CLAMP_TO_SHORT(cs->predictor);
364
365 cs->step_index = (*src++) & 0x7F;
366
889c5224 367 if (cs->step_index > 88) fprintf(stderr, "ERROR: step_index = %i\n", cs->step_index);
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368 if (cs->step_index > 88) cs->step_index = 88;
369
370 cs->step = step_table[cs->step_index];
371
372 if (st && channel)
373 samples++;
374
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375 *samples++ = cs->predictor;
376 samples += st;
377
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378 for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
379 *samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F);
380 samples += avctx->channels;
381 *samples = adpcm_ima_expand_nibble(cs, (src[0] >> 4) & 0x0F);
382 samples += avctx->channels;
383 src ++;
384 }
385
386 if(st) { /* handle stereo interlacing */
387 c->channel = (channel + 1) % 2; /* we get one packet for left, then one for right data */
388 if(channel == 0) { /* wait for the other packet before outputing anything */
389 *data_size = 0;
390 return src - buf;
391 }
392 }
393 break;
394 case CODEC_ID_ADPCM_IMA_WAV:
395 if (buf_size > BLKSIZE) {
396 if (avctx->block_align != 0)
397 buf_size = avctx->block_align;
398 else
399 buf_size = BLKSIZE;
400 }
401 n = buf_size - 4 * avctx->channels;
402 cs = &(c->status[0]);
403 cs->predictor = (*src++) & 0x0FF;
404 cs->predictor |= ((*src++) << 8) & 0x0FF00;
405 if(cs->predictor & 0x8000)
406 cs->predictor -= 0x10000;
407 CLAMP_TO_SHORT(cs->predictor);
408
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409 *samples++ = cs->predictor;
410
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411 cs->step_index = *src++;
412 if (cs->step_index < 0) cs->step_index = 0;
413 if (cs->step_index > 88) cs->step_index = 88;
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414 if (*src++) fprintf(stderr, "unused byte should be null !!\n"); /* unused */
415
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416 if (st) {
417 cs = &(c->status[1]);
418 cs->predictor = (*src++) & 0x0FF;
419 cs->predictor |= ((*src++) << 8) & 0x0FF00;
420 if(cs->predictor & 0x8000)
421 cs->predictor -= 0x10000;
422 CLAMP_TO_SHORT(cs->predictor);
423
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424 *samples++ = cs->predictor;
425
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426 cs->step_index = *src++;
427 if (cs->step_index < 0) cs->step_index = 0;
428 if (cs->step_index > 88) cs->step_index = 88;
429 src++; /* unused */
430 }
431 cs = &(c->status[0]);
432
433
434 for(m=3; n>0; n--, m--) {
435 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] & 0x0F);
436 if (st)
437 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[4] & 0x0F);
438 *samples++ = adpcm_ima_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
439 if (st)
440 *samples++ = adpcm_ima_expand_nibble(&c->status[1], (src[4] >> 4) & 0x0F);
441 src ++;
442 if (st && !m) {
443 m=3;
444 src+=4;
445 }
446 }
447 break;
448 case CODEC_ID_ADPCM_MS:
449
450 if (buf_size > BLKSIZE) {
451 if (avctx->block_align != 0)
452 buf_size = avctx->block_align;
453 else
454 buf_size = BLKSIZE;
455 }
456 n = buf_size - 7 * avctx->channels;
457 if (n < 0)
458 return -1;
459 block_predictor[0] = (*src++); /* should be bound */
460 block_predictor[0] = (block_predictor[0] < 0)?(0):((block_predictor[0] > 7)?(7):(block_predictor[0]));
461 block_predictor[1] = 0;
462 if (st)
463 block_predictor[1] = (*src++);
464 block_predictor[1] = (block_predictor[1] < 0)?(0):((block_predictor[1] > 7)?(7):(block_predictor[1]));
465 c->status[0].idelta = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
466 if (c->status[0].idelta & 0x08000)
467 c->status[0].idelta -= 0x10000;
468 src+=2;
469 if (st)
470 c->status[1].idelta = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
471 if (st && c->status[1].idelta & 0x08000)
472 c->status[1].idelta |= 0xFFFF0000;
473 if (st)
474 src+=2;
475 c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];
476 c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];
477 c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];
478 c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];
479
480 c->status[0].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
481 src+=2;
482 if (st) c->status[1].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
483 if (st) src+=2;
484 c->status[0].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
485 src+=2;
486 if (st) c->status[1].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
487 if (st) src+=2;
488
489 *samples++ = c->status[0].sample1;
490 if (st) *samples++ = c->status[1].sample1;
491 *samples++ = c->status[0].sample2;
492 if (st) *samples++ = c->status[1].sample2;
493 for(;n>0;n--) {
494 *samples++ = adpcm_ms_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
495 *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
496 src ++;
497 }
498 break;
499 default:
500 *data_size = 0;
501 return -1;
502 }
503 *data_size = (UINT8 *)samples - (UINT8 *)data;
504 return src - buf;
505}
506
507#define ADPCM_CODEC(id, name) \
508AVCodec name ## _encoder = { \
509 #name, \
510 CODEC_TYPE_AUDIO, \
511 id, \
512 sizeof(ADPCMContext), \
513 adpcm_encode_init, \
514 adpcm_encode_frame, \
515 adpcm_encode_close, \
516 NULL, \
517}; \
518AVCodec name ## _decoder = { \
519 #name, \
520 CODEC_TYPE_AUDIO, \
521 id, \
522 sizeof(ADPCMContext), \
523 adpcm_decode_init, \
524 NULL, \
525 NULL, \
526 adpcm_decode_frame, \
527};
528
529ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
530ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
531ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
532
533#undef ADPCM_CODEC
889c5224 534