FFmpeg: libavcodec/adpcm.c Source File

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adpcm.c

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1 /*

3 *

4 * This file is part of FFmpeg.

5 *

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

7 * modify it under the terms of the GNU Lesser General Public

8 * License as published by the Free Software Foundation; either

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

10 *

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

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

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

14 * Lesser General Public License for more details.

15 *

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

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

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

19 */

20 #include "avcodec.h"

21 #include "get_bits.h"

22 #include "put_bits.h"

23 #include "bytestream.h"

24 #include "adpcm.h"

25 #include "adpcm_data.h"

26 #include "internal.h"

28 /**

29 * @file

30 * ADPCM decoders

31 * First version by Francois Revol (revol@free.fr)

32 * Fringe ADPCM codecs (e.g., DK3, DK4, Westwood)

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

34 * CD-ROM XA ADPCM codec by BERO

35 * EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)

36 * EA ADPCM R1/R2/R3 decoder by Peter Ross (pross@xvid.org)

37 * EA IMA EACS decoder by Peter Ross (pross@xvid.org)

38 * EA IMA SEAD decoder by Peter Ross (pross@xvid.org)

39 * EA ADPCM XAS decoder by Peter Ross (pross@xvid.org)

40 * MAXIS EA ADPCM decoder by Robert Marston (rmarston@gmail.com)

41 * THP ADPCM decoder by Marco Gerards (mgerards@xs4all.nl)

42 *

43 * Features and limitations:

44 *

45 * Reference documents:

46 * http://wiki.multimedia.cx/index.php?title=Category:ADPCM_Audio_Codecs

47 * http://www.pcisys.net/~melanson/codecs/simpleaudio.html [dead]

48 * http://www.geocities.com/SiliconValley/8682/aud3.txt [dead]

49 * http://openquicktime.sourceforge.net/

50 * XAnim sources (xa_codec.c) http://xanim.polter.net/

51 * http://www.cs.ucla.edu/~leec/mediabench/applications.html [dead]

52 * SoX source code http://sox.sourceforge.net/

53 *

54 * CD-ROM XA:

55 * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html [dead]

56 * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html [dead]

57 * readstr http://www.geocities.co.jp/Playtown/2004/

58 */

60 /* These are for CD-ROM XA ADPCM */

61 static const int xa_adpcm_table[5][2] = {

62 { 0, 0 },

63 { 60, 0 },

64 { 115, -52 },

65 { 98, -55 },

66 { 122, -60 }

67 };

69 static const int ea_adpcm_table[] = {

70 0, 240, 460, 392,

71 0, 0, -208, -220,

72 0, 1, 3, 4,

73 7, 8, 10, 11,

74 0, -1, -3, -4

75 };

77 // padded to zero where table size is less then 16

78 static const int swf_index_tables[4][16] = {

79 /*2*/ { -1, 2 },

80 /*3*/ { -1, -1, 2, 4 },

81 /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },

82 /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }

83 };

85 /* end of tables */

87 typedef struct ADPCMDecodeContext {

88 AVFrame frame;

89 ADPCMChannelStatus status[6];

90 int vqa_version; /**< VQA version. Used for ADPCM_IMA_WS */

91 } ADPCMDecodeContext;

93 static av_cold int adpcm_decode_init(AVCodecContext * avctx)

94 {

95 ADPCMDecodeContext *c = avctx->priv_data;

96 unsigned int min_channels = 1;

97 unsigned int max_channels = 2;

99 switch(avctx->codec->id) {

100 case AV_CODEC_ID_ADPCM_EA:

101 min_channels = 2;

102 break;

103 case AV_CODEC_ID_ADPCM_AFC:

104 case AV_CODEC_ID_ADPCM_EA_R1:

105 case AV_CODEC_ID_ADPCM_EA_R2:

106 case AV_CODEC_ID_ADPCM_EA_R3:

107 case AV_CODEC_ID_ADPCM_EA_XAS:

108 case AV_CODEC_ID_ADPCM_THP:

109 max_channels = 6;

110 break;

111 }

112 if (avctx->channels < min_channels || avctx->channels > max_channels) {

113 av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");

114 return AVERROR(EINVAL);

115 }

116

117 switch(avctx->codec->id) {

118 case AV_CODEC_ID_ADPCM_CT:

119 c->status[0].step = c->status[1].step = 511;

120 break;

121 case AV_CODEC_ID_ADPCM_IMA_WAV:

122 if (avctx->bits_per_coded_sample != 4) {

123 av_log(avctx, AV_LOG_ERROR, "Only 4-bit ADPCM IMA WAV files are supported\n");

124 return -1;

125 }

126 break;

127 case AV_CODEC_ID_ADPCM_IMA_APC:

128 if (avctx->extradata && avctx->extradata_size >= 8) {

129 c->status[0].predictor = AV_RL32(avctx->extradata);

130 c->status[1].predictor = AV_RL32(avctx->extradata + 4);

131 }

132 break;

133 case AV_CODEC_ID_ADPCM_IMA_WS:

134 if (avctx->extradata && avctx->extradata_size >= 2)

135 c->vqa_version = AV_RL16(avctx->extradata);

136 break;

137 default:

138 break;

139 }

140

141 switch(avctx->codec->id) {

142 case AV_CODEC_ID_ADPCM_IMA_QT:

143 case AV_CODEC_ID_ADPCM_IMA_WAV:

144 case AV_CODEC_ID_ADPCM_4XM:

145 case AV_CODEC_ID_ADPCM_XA:

146 case AV_CODEC_ID_ADPCM_EA_R1:

147 case AV_CODEC_ID_ADPCM_EA_R2:

148 case AV_CODEC_ID_ADPCM_EA_R3:

149 case AV_CODEC_ID_ADPCM_EA_XAS:

150 case AV_CODEC_ID_ADPCM_THP:

151 case AV_CODEC_ID_ADPCM_AFC:

152 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;

153 break;

154 case AV_CODEC_ID_ADPCM_IMA_WS:

155 avctx->sample_fmt = c->vqa_version == 3 ? AV_SAMPLE_FMT_S16P :

156 AV_SAMPLE_FMT_S16;

157 break;

158 default:

159 avctx->sample_fmt = AV_SAMPLE_FMT_S16;

160 }

161

162 avcodec_get_frame_defaults(&c->frame);

163 avctx->coded_frame = &c->frame;

164

165 return 0;

166 }

167

168 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)

169 {

170 int step_index;

171 int predictor;

172 int sign, delta, diff, step;

173

174 step = ff_adpcm_step_table[c->step_index];

175 step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];

176 step_index = av_clip(step_index, 0, 88);

177

178 sign = nibble & 8;

179 delta = nibble & 7;

180 /* perform direct multiplication instead of series of jumps proposed by

181 * the reference ADPCM implementation since modern CPUs can do the mults

182 * quickly enough */

183 diff = ((2 * delta + 1) * step) >> shift;

184 predictor = c->predictor;

185 if (sign) predictor -= diff;

186 else predictor += diff;

187

188 c->predictor = av_clip_int16(predictor);

189 c->step_index = step_index;

190

191 return (short)c->predictor;

192 }

193

194 static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble, int shift)

195 {

196 int step_index;

197 int predictor;

198 int diff, step;

199

200 step = ff_adpcm_step_table[c->step_index];

201 step_index = c->step_index + ff_adpcm_index_table[nibble];

202 step_index = av_clip(step_index, 0, 88);

203

204 diff = step >> 3;

205 if (nibble & 4) diff += step;

206 if (nibble & 2) diff += step >> 1;

207 if (nibble & 1) diff += step >> 2;

208

209 if (nibble & 8)

210 predictor = c->predictor - diff;

211 else

212 predictor = c->predictor + diff;

213

214 c->predictor = av_clip_int16(predictor);

215 c->step_index = step_index;

216

217 return c->predictor;

218 }

219

220 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, int nibble)

221 {

222 int predictor;

223

224 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;

225 predictor += ((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;

226

227 c->sample2 = c->sample1;

228 c->sample1 = av_clip_int16(predictor);

229 c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;

230 if (c->idelta < 16) c->idelta = 16;

231

232 return c->sample1;

233 }

234

235 static inline short adpcm_ima_oki_expand_nibble(ADPCMChannelStatus *c, int nibble)

236 {

237 int step_index, predictor, sign, delta, diff, step;

238

239 step = ff_adpcm_oki_step_table[c->step_index];

240 step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];

241 step_index = av_clip(step_index, 0, 48);

242

243 sign = nibble & 8;

244 delta = nibble & 7;

245 diff = ((2 * delta + 1) * step) >> 3;

246 predictor = c->predictor;

247 if (sign) predictor -= diff;

248 else predictor += diff;

249

250 c->predictor = av_clip(predictor, -2048, 2047);

251 c->step_index = step_index;

252

253 return c->predictor << 4;

254 }

255

256 static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)

257 {

258 int sign, delta, diff;

259 int new_step;

260

261 sign = nibble & 8;

262 delta = nibble & 7;

263 /* perform direct multiplication instead of series of jumps proposed by

264 * the reference ADPCM implementation since modern CPUs can do the mults

265 * quickly enough */

266 diff = ((2 * delta + 1) * c->step) >> 3;

267 /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */

268 c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);

269 c->predictor = av_clip_int16(c->predictor);

270 /* calculate new step and clamp it to range 511..32767 */

271 new_step = (ff_adpcm_AdaptationTable[nibble & 7] * c->step) >> 8;

272 c->step = av_clip(new_step, 511, 32767);

273

274 return (short)c->predictor;

275 }

276

277 static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)

278 {

279 int sign, delta, diff;

280

281 sign = nibble & (1<<(size-1));

282 delta = nibble & ((1<<(size-1))-1);

283 diff = delta << (7 + c->step + shift);

284

285 /* clamp result */

286 c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);

287

288 /* calculate new step */

289 if (delta >= (2*size - 3) && c->step < 3)

290 c->step++;

291 else if (delta == 0 && c->step > 0)

292 c->step--;

293

294 return (short) c->predictor;

295 }

296

297 static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)

298 {

299 if(!c->step) {

300 c->predictor = 0;

301 c->step = 127;

302 }

303

304 c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;

305 c->predictor = av_clip_int16(c->predictor);

306 c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;

307 c->step = av_clip(c->step, 127, 24567);

308 return c->predictor;

309 }

310

311 static int xa_decode(AVCodecContext *avctx, int16_t *out0, int16_t *out1,

312 const uint8_t *in, ADPCMChannelStatus *left,

313 ADPCMChannelStatus *right, int channels, int sample_offset)

314 {

315 int i, j;

316 int shift,filter,f0,f1;

317 int s_1,s_2;

318 int d,s,t;

319

320 out0 += sample_offset;

321 if (channels == 1)

322 out1 = out0 + 28;

323 else

324 out1 += sample_offset;

325

326 for(i=0;i<4;i++) {

327 shift = 12 - (in[4+i*2] & 15);

328 filter = in[4+i*2] >> 4;

329 if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table)) {

330 av_log_ask_for_sample(avctx, "unknown XA-ADPCM filter %d\n", filter);

331 filter=0;

332 }

333 f0 = xa_adpcm_table[filter][0];

334 f1 = xa_adpcm_table[filter][1];

335

336 s_1 = left->sample1;

337 s_2 = left->sample2;

338

339 for(j=0;j<28;j++) {

340 d = in[16+i+j*4];

341

342 t = sign_extend(d, 4);

343 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);

344 s_2 = s_1;

345 s_1 = av_clip_int16(s);

346 out0[j] = s_1;

347 }

348

349 if (channels == 2) {

350 left->sample1 = s_1;

351 left->sample2 = s_2;

352 s_1 = right->sample1;

353 s_2 = right->sample2;

354 }

355

356 shift = 12 - (in[5+i*2] & 15);

357 filter = in[5+i*2] >> 4;

358 if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table)) {

359 av_log_ask_for_sample(avctx, "unknown XA-ADPCM filter %d\n", filter);

360 filter=0;

361 }

362

363 f0 = xa_adpcm_table[filter][0];

364 f1 = xa_adpcm_table[filter][1];

365

366 for(j=0;j<28;j++) {

367 d = in[16+i+j*4];

368

369 t = sign_extend(d >> 4, 4);

370 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);

371 s_2 = s_1;

372 s_1 = av_clip_int16(s);

373 out1[j] = s_1;

374 }

375

376 if (channels == 2) {

377 right->sample1 = s_1;

378 right->sample2 = s_2;

379 } else {

380 left->sample1 = s_1;

381 left->sample2 = s_2;

382 }

383

384 out0 += 28 * (3 - channels);

385 out1 += 28 * (3 - channels);

386 }

387

388 return 0;

389 }

390

391 static void adpcm_swf_decode(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int16_t *samples)

392 {

393 ADPCMDecodeContext *c = avctx->priv_data;

394 GetBitContext gb;

395 const int *table;

396 int k0, signmask, nb_bits, count;

397 int size = buf_size*8;

398 int i;

399

400 init_get_bits(&gb, buf, size);

401

402 //read bits & initial values

403 nb_bits = get_bits(&gb, 2)+2;

404 table = swf_index_tables[nb_bits-2];

405 k0 = 1 << (nb_bits-2);

406 signmask = 1 << (nb_bits-1);

407

408 while (get_bits_count(&gb) <= size - 22*avctx->channels) {

409 for (i = 0; i < avctx->channels; i++) {

410 *samples++ = c->status[i].predictor = get_sbits(&gb, 16);

411 c->status[i].step_index = get_bits(&gb, 6);

412 }

413

414 for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {

415 int i;

416

417 for (i = 0; i < avctx->channels; i++) {

418 // similar to IMA adpcm

419 int delta = get_bits(&gb, nb_bits);

420 int step = ff_adpcm_step_table[c->status[i].step_index];

421 long vpdiff = 0; // vpdiff = (delta+0.5)*step/4

422 int k = k0;

423

424 do {

425 if (delta & k)

426 vpdiff += step;

427 step >>= 1;

428 k >>= 1;

429 } while(k);

430 vpdiff += step;

431

432 if (delta & signmask)

433 c->status[i].predictor -= vpdiff;

434 else

435 c->status[i].predictor += vpdiff;

436

437 c->status[i].step_index += table[delta & (~signmask)];

438

439 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);

440 c->status[i].predictor = av_clip_int16(c->status[i].predictor);

441

442 *samples++ = c->status[i].predictor;

443 }

444 }

445 }

446 }

447

448 /**

449 * Get the number of samples that will be decoded from the packet.

450 * In one case, this is actually the maximum number of samples possible to

451 * decode with the given buf_size.

452 *

453 * @param[out] coded_samples set to the number of samples as coded in the

454 * packet, or 0 if the codec does not encode the

455 * number of samples in each frame.

456 */

457 static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,

458 int buf_size, int *coded_samples)

459 {

460 ADPCMDecodeContext *s = avctx->priv_data;

461 int nb_samples = 0;

462 int ch = avctx->channels;

463 int has_coded_samples = 0;

464 int header_size;

465

466 *coded_samples = 0;

467

468 if(ch <= 0)

469 return 0;

470

471 switch (avctx->codec->id) {

472 /* constant, only check buf_size */

473 case AV_CODEC_ID_ADPCM_EA_XAS:

474 if (buf_size < 76 * ch)

475 return 0;

476 nb_samples = 128;

477 break;

478 case AV_CODEC_ID_ADPCM_IMA_QT:

479 if (buf_size < 34 * ch)

480 return 0;

481 nb_samples = 64;

482 break;

483 /* simple 4-bit adpcm */

484 case AV_CODEC_ID_ADPCM_CT:

485 case AV_CODEC_ID_ADPCM_IMA_APC:

486 case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

487 case AV_CODEC_ID_ADPCM_IMA_OKI:

488 case AV_CODEC_ID_ADPCM_IMA_WS:

489 case AV_CODEC_ID_ADPCM_YAMAHA:

490 nb_samples = buf_size * 2 / ch;

491 break;

492 }

493 if (nb_samples)

494 return nb_samples;

495

496 /* simple 4-bit adpcm, with header */

497 header_size = 0;

498 switch (avctx->codec->id) {

499 case AV_CODEC_ID_ADPCM_4XM:

500 case AV_CODEC_ID_ADPCM_IMA_ISS: header_size = 4 * ch; break;

501 case AV_CODEC_ID_ADPCM_IMA_AMV: header_size = 8; break;

502 case AV_CODEC_ID_ADPCM_IMA_SMJPEG: header_size = 4 * ch; break;

503 }

504 if (header_size > 0)

505 return (buf_size - header_size) * 2 / ch;

506

507 /* more complex formats */

508 switch (avctx->codec->id) {

509 case AV_CODEC_ID_ADPCM_EA:

510 has_coded_samples = 1;

511 *coded_samples = bytestream2_get_le32(gb);

512 *coded_samples -= *coded_samples % 28;

513 nb_samples = (buf_size - 12) / 30 * 28;

514 break;

515 case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

516 has_coded_samples = 1;

517 *coded_samples = bytestream2_get_le32(gb);

518 nb_samples = (buf_size - (4 + 8 * ch)) * 2 / ch;

519 break;

520 case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

521 nb_samples = (buf_size - ch) / ch * 2;

522 break;

523 case AV_CODEC_ID_ADPCM_EA_R1:

524 case AV_CODEC_ID_ADPCM_EA_R2:

525 case AV_CODEC_ID_ADPCM_EA_R3:

526 /* maximum number of samples */

527 /* has internal offsets and a per-frame switch to signal raw 16-bit */

528 has_coded_samples = 1;

529 switch (avctx->codec->id) {

530 case AV_CODEC_ID_ADPCM_EA_R1:

531 header_size = 4 + 9 * ch;

532 *coded_samples = bytestream2_get_le32(gb);

533 break;

534 case AV_CODEC_ID_ADPCM_EA_R2:

535 header_size = 4 + 5 * ch;

536 *coded_samples = bytestream2_get_le32(gb);

537 break;

538 case AV_CODEC_ID_ADPCM_EA_R3:

539 header_size = 4 + 5 * ch;

540 *coded_samples = bytestream2_get_be32(gb);

541 break;

542 }

543 *coded_samples -= *coded_samples % 28;

544 nb_samples = (buf_size - header_size) * 2 / ch;

545 nb_samples -= nb_samples % 28;

546 break;

547 case AV_CODEC_ID_ADPCM_IMA_DK3:

548 if (avctx->block_align > 0)

549 buf_size = FFMIN(buf_size, avctx->block_align);

550 nb_samples = ((buf_size - 16) * 2 / 3 * 4) / ch;

551 break;

552 case AV_CODEC_ID_ADPCM_IMA_DK4:

553 if (avctx->block_align > 0)

554 buf_size = FFMIN(buf_size, avctx->block_align);

555 nb_samples = 1 + (buf_size - 4 * ch) * 2 / ch;

556 break;

557 case AV_CODEC_ID_ADPCM_IMA_WAV:

558 if (avctx->block_align > 0)

559 buf_size = FFMIN(buf_size, avctx->block_align);

560 nb_samples = 1 + (buf_size - 4 * ch) / (4 * ch) * 8;

561 break;

562 case AV_CODEC_ID_ADPCM_MS:

563 if (avctx->block_align > 0)

564 buf_size = FFMIN(buf_size, avctx->block_align);

565 nb_samples = 2 + (buf_size - 7 * ch) * 2 / ch;

566 break;

567 case AV_CODEC_ID_ADPCM_SBPRO_2:

568 case AV_CODEC_ID_ADPCM_SBPRO_3:

569 case AV_CODEC_ID_ADPCM_SBPRO_4:

570 {

571 int samples_per_byte;

572 switch (avctx->codec->id) {

573 case AV_CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;

574 case AV_CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;

575 case AV_CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;

576 }

577 if (!s->status[0].step_index) {

578 nb_samples++;

579 buf_size -= ch;

580 }

581 nb_samples += buf_size * samples_per_byte / ch;

582 break;

583 }

584 case AV_CODEC_ID_ADPCM_SWF:

585 {

586 int buf_bits = buf_size * 8 - 2;

587 int nbits = (bytestream2_get_byte(gb) >> 6) + 2;

588 int block_hdr_size = 22 * ch;

589 int block_size = block_hdr_size + nbits * ch * 4095;

590 int nblocks = buf_bits / block_size;

591 int bits_left = buf_bits - nblocks * block_size;

592 nb_samples = nblocks * 4096;

593 if (bits_left >= block_hdr_size)

594 nb_samples += 1 + (bits_left - block_hdr_size) / (nbits * ch);

595 break;

596 }

597 case AV_CODEC_ID_ADPCM_THP:

598 has_coded_samples = 1;

599 bytestream2_skip(gb, 4); // channel size

600 *coded_samples = bytestream2_get_be32(gb);

601 *coded_samples -= *coded_samples % 14;

602 nb_samples = (buf_size - (8 + 36 * ch)) / (8 * ch) * 14;

603 break;

604 case AV_CODEC_ID_ADPCM_AFC:

605 nb_samples = buf_size / (9 * ch) * 16;

606 break;

607 case AV_CODEC_ID_ADPCM_XA:

608 nb_samples = (buf_size / 128) * 224 / ch;

609 break;

610 }

611

612 /* validate coded sample count */

613 if (has_coded_samples && (*coded_samples <= 0 || *coded_samples > nb_samples))

614 return AVERROR_INVALIDDATA;

615

616 return nb_samples;

617 }

618

619 static int adpcm_decode_frame(AVCodecContext *avctx, void *data,

620 int *got_frame_ptr, AVPacket *avpkt)

621 {

622 const uint8_t *buf = avpkt->data;

623 int buf_size = avpkt->size;

624 ADPCMDecodeContext *c = avctx->priv_data;

625 ADPCMChannelStatus *cs;

626 int n, m, channel, i;

627 short *samples;

628 int16_t **samples_p;

629 int st; /* stereo */

630 int count1, count2;

631 int nb_samples, coded_samples, ret;

632 GetByteContext gb;

633

634 bytestream2_init(&gb, buf, buf_size);

635 nb_samples = get_nb_samples(avctx, &gb, buf_size, &coded_samples);

636 if (nb_samples <= 0) {

637 av_log(avctx, AV_LOG_ERROR, "invalid number of samples in packet\n");

638 return AVERROR_INVALIDDATA;

639 }

640

641 /* get output buffer */

642 c->frame.nb_samples = nb_samples;

643 if ((ret = ff_get_buffer(avctx, &c->frame)) < 0) {

644 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

645 return ret;

646 }

647 samples = (short *)c->frame.data[0];

648 samples_p = (int16_t **)c->frame.extended_data;

649

650 /* use coded_samples when applicable */

651 /* it is always <= nb_samples, so the output buffer will be large enough */

652 if (coded_samples) {

653 if (coded_samples != nb_samples)

654 av_log(avctx, AV_LOG_WARNING, "mismatch in coded sample count\n");

655 c->frame.nb_samples = nb_samples = coded_samples;

656 }

657

658 st = avctx->channels == 2 ? 1 : 0;

659

660 switch(avctx->codec->id) {

661 case AV_CODEC_ID_ADPCM_IMA_QT:

662 /* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples).

663 Channel data is interleaved per-chunk. */

664 for (channel = 0; channel < avctx->channels; channel++) {

665 int predictor;

666 int step_index;

667 cs = &(c->status[channel]);

668 /* (pppppp) (piiiiiii) */

669

670 /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */

671 predictor = sign_extend(bytestream2_get_be16u(&gb), 16);

672 step_index = predictor & 0x7F;

673 predictor &= ~0x7F;

674

675 if (cs->step_index == step_index) {

676 int diff = predictor - cs->predictor;

677 if (diff < 0)

678 diff = - diff;

679 if (diff > 0x7f)

680 goto update;

681 } else {

682 update:

683 cs->step_index = step_index;

684 cs->predictor = predictor;

685 }

686

687 if (cs->step_index > 88u){

688 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

689 channel, cs->step_index);

690 return AVERROR_INVALIDDATA;

691 }

692

693 samples = samples_p[channel];

694

695 for (m = 0; m < 64; m += 2) {

696 int byte = bytestream2_get_byteu(&gb);

697 samples[m ] = adpcm_ima_qt_expand_nibble(cs, byte & 0x0F, 3);

698 samples[m + 1] = adpcm_ima_qt_expand_nibble(cs, byte >> 4 , 3);

699 }

700 }

701 break;

702 case AV_CODEC_ID_ADPCM_IMA_WAV:

703 for(i=0; i<avctx->channels; i++){

704 cs = &(c->status[i]);

705 cs->predictor = samples_p[i][0] = sign_extend(bytestream2_get_le16u(&gb), 16);

706

707 cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

708 if (cs->step_index > 88u){

709 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

710 i, cs->step_index);

711 return AVERROR_INVALIDDATA;

712 }

713 }

714

715 for (n = 0; n < (nb_samples - 1) / 8; n++) {

716 for (i = 0; i < avctx->channels; i++) {

717 cs = &c->status[i];

718 samples = &samples_p[i][1 + n * 8];

719 for (m = 0; m < 8; m += 2) {

720 int v = bytestream2_get_byteu(&gb);

721 samples[m ] = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);

722 samples[m + 1] = adpcm_ima_expand_nibble(cs, v >> 4 , 3);

723 }

724 }

725 }

726 break;

727 case AV_CODEC_ID_ADPCM_4XM:

728 for (i = 0; i < avctx->channels; i++)

729 c->status[i].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

730

731 for (i = 0; i < avctx->channels; i++) {

732 c->status[i].step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

733 if (c->status[i].step_index > 88u) {

734 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

735 i, c->status[i].step_index);

736 return AVERROR_INVALIDDATA;

737 }

738 }

739

740 for (i = 0; i < avctx->channels; i++) {

741 samples = (int16_t *)c->frame.data[i];

742 cs = &c->status[i];

743 for (n = nb_samples >> 1; n > 0; n--) {

744 int v = bytestream2_get_byteu(&gb);

745 *samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 4);

746 *samples++ = adpcm_ima_expand_nibble(cs, v >> 4 , 4);

747 }

748 }

749 break;

750 case AV_CODEC_ID_ADPCM_MS:

751 {

752 int block_predictor;

753

754 block_predictor = bytestream2_get_byteu(&gb);

755 if (block_predictor > 6) {

756 av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[0] = %d\n",

757 block_predictor);

758 return AVERROR_INVALIDDATA;

759 }

760 c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];

761 c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];

762 if (st) {

763 block_predictor = bytestream2_get_byteu(&gb);

764 if (block_predictor > 6) {

765 av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[1] = %d\n",

766 block_predictor);

767 return AVERROR_INVALIDDATA;

768 }

769 c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];

770 c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];

771 }

772 c->status[0].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);

773 if (st){

774 c->status[1].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);

775 }

776

777 c->status[0].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);

778 if (st) c->status[1].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);

779 c->status[0].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);

780 if (st) c->status[1].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);

781

782 *samples++ = c->status[0].sample2;

783 if (st) *samples++ = c->status[1].sample2;

784 *samples++ = c->status[0].sample1;

785 if (st) *samples++ = c->status[1].sample1;

786 for(n = (nb_samples - 2) >> (1 - st); n > 0; n--) {

787 int byte = bytestream2_get_byteu(&gb);

788 *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], byte >> 4 );

789 *samples++ = adpcm_ms_expand_nibble(&c->status[st], byte & 0x0F);

790 }

791 break;

792 }

793 case AV_CODEC_ID_ADPCM_IMA_DK4:

794 for (channel = 0; channel < avctx->channels; channel++) {

795 cs = &c->status[channel];

796 cs->predictor = *samples++ = sign_extend(bytestream2_get_le16u(&gb), 16);

797 cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

798 if (cs->step_index > 88u){

799 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

800 channel, cs->step_index);

801 return AVERROR_INVALIDDATA;

802 }

803 }

804 for (n = (nb_samples - 1) >> (1 - st); n > 0; n--) {

805 int v = bytestream2_get_byteu(&gb);

806 *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4 , 3);

807 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);

808 }

809 break;

810 case AV_CODEC_ID_ADPCM_IMA_DK3:

811 {

812 int last_byte = 0;

813 int nibble;

814 int decode_top_nibble_next = 0;

815 int diff_channel;

816 const int16_t *samples_end = samples + avctx->channels * nb_samples;

817

818 bytestream2_skipu(&gb, 10);

819 c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

820 c->status[1].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

821 c->status[0].step_index = bytestream2_get_byteu(&gb);

822 c->status[1].step_index = bytestream2_get_byteu(&gb);

823 if (c->status[0].step_index > 88u || c->status[1].step_index > 88u){

824 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i/%i\n",

825 c->status[0].step_index, c->status[1].step_index);

826 return AVERROR_INVALIDDATA;

827 }

828 /* sign extend the predictors */

829 diff_channel = c->status[1].predictor;

830

831 /* DK3 ADPCM support macro */

832 #define DK3_GET_NEXT_NIBBLE() \

833 if (decode_top_nibble_next) { \

834 nibble = last_byte >> 4; \

835 decode_top_nibble_next = 0; \

836 } else { \

837 last_byte = bytestream2_get_byteu(&gb); \

838 nibble = last_byte & 0x0F; \

839 decode_top_nibble_next = 1; \

840 }

841

842 while (samples < samples_end) {

843

844 /* for this algorithm, c->status[0] is the sum channel and

845 * c->status[1] is the diff channel */

846

847 /* process the first predictor of the sum channel */

848 DK3_GET_NEXT_NIBBLE();

849 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

850

851 /* process the diff channel predictor */

852 DK3_GET_NEXT_NIBBLE();

853 adpcm_ima_expand_nibble(&c->status[1], nibble, 3);

854

855 /* process the first pair of stereo PCM samples */

856 diff_channel = (diff_channel + c->status[1].predictor) / 2;

857 *samples++ = c->status[0].predictor + c->status[1].predictor;

858 *samples++ = c->status[0].predictor - c->status[1].predictor;

859

860 /* process the second predictor of the sum channel */

861 DK3_GET_NEXT_NIBBLE();

862 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

863

864 /* process the second pair of stereo PCM samples */

865 diff_channel = (diff_channel + c->status[1].predictor) / 2;

866 *samples++ = c->status[0].predictor + c->status[1].predictor;

867 *samples++ = c->status[0].predictor - c->status[1].predictor;

868 }

869 break;

870 }

871 case AV_CODEC_ID_ADPCM_IMA_ISS:

872 for (channel = 0; channel < avctx->channels; channel++) {

873 cs = &c->status[channel];

874 cs->predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

875 cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

876 if (cs->step_index > 88u){

877 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

878 channel, cs->step_index);

879 return AVERROR_INVALIDDATA;

880 }

881 }

882

883 for (n = nb_samples >> (1 - st); n > 0; n--) {

884 int v1, v2;

885 int v = bytestream2_get_byteu(&gb);

886 /* nibbles are swapped for mono */

887 if (st) {

888 v1 = v >> 4;

889 v2 = v & 0x0F;

890 } else {

891 v2 = v >> 4;

892 v1 = v & 0x0F;

893 }

894 *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);

895 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);

896 }

897 break;

898 case AV_CODEC_ID_ADPCM_IMA_APC:

899 while (bytestream2_get_bytes_left(&gb) > 0) {

900 int v = bytestream2_get_byteu(&gb);

901 *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4 , 3);

902 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);

903 }

904 break;

905 case AV_CODEC_ID_ADPCM_IMA_OKI:

906 while (bytestream2_get_bytes_left(&gb) > 0) {

907 int v = bytestream2_get_byteu(&gb);

908 *samples++ = adpcm_ima_oki_expand_nibble(&c->status[0], v >> 4 );

909 *samples++ = adpcm_ima_oki_expand_nibble(&c->status[st], v & 0x0F);

910 }

911 break;

912 case AV_CODEC_ID_ADPCM_IMA_WS:

913 if (c->vqa_version == 3) {

914 for (channel = 0; channel < avctx->channels; channel++) {

915 int16_t *smp = samples_p[channel];

916

917 for (n = nb_samples / 2; n > 0; n--) {

918 int v = bytestream2_get_byteu(&gb);

919 *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4 , 3);

920 *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

921 }

922 }

923 } else {

924 for (n = nb_samples / 2; n > 0; n--) {

925 for (channel = 0; channel < avctx->channels; channel++) {

926 int v = bytestream2_get_byteu(&gb);

927 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4 , 3);

928 samples[st] = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

929 }

930 samples += avctx->channels;

931 }

932 }

933 bytestream2_seek(&gb, 0, SEEK_END);

934 break;

935 case AV_CODEC_ID_ADPCM_XA:

936 {

937 int16_t *out0 = samples_p[0];

938 int16_t *out1 = samples_p[1];

939 int samples_per_block = 28 * (3 - avctx->channels) * 4;

940 int sample_offset = 0;

941 while (bytestream2_get_bytes_left(&gb) >= 128) {

942 if ((ret = xa_decode(avctx, out0, out1, buf + bytestream2_tell(&gb),

943 &c->status[0], &c->status[1],

944 avctx->channels, sample_offset)) < 0)

945 return ret;

946 bytestream2_skipu(&gb, 128);

947 sample_offset += samples_per_block;

948 }

949 break;

950 }

951 case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

952 for (i=0; i<=st; i++) {

953 c->status[i].step_index = bytestream2_get_le32u(&gb);

954 if (c->status[i].step_index > 88u) {

955 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

956 i, c->status[i].step_index);

957 return AVERROR_INVALIDDATA;

958 }

959 }

960 for (i=0; i<=st; i++)

961 c->status[i].predictor = bytestream2_get_le32u(&gb);

962

963 for (n = nb_samples >> (1 - st); n > 0; n--) {

964 int byte = bytestream2_get_byteu(&gb);

965 *samples++ = adpcm_ima_expand_nibble(&c->status[0], byte >> 4, 3);

966 *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 3);

967 }

968 break;

969 case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

970 for (n = nb_samples >> (1 - st); n > 0; n--) {

971 int byte = bytestream2_get_byteu(&gb);

972 *samples++ = adpcm_ima_expand_nibble(&c->status[0], byte >> 4, 6);

973 *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 6);

974 }

975 break;

976 case AV_CODEC_ID_ADPCM_EA:

977 {

978 int previous_left_sample, previous_right_sample;

979 int current_left_sample, current_right_sample;

980 int next_left_sample, next_right_sample;

981 int coeff1l, coeff2l, coeff1r, coeff2r;

982 int shift_left, shift_right;

983

984 /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,

985 each coding 28 stereo samples. */

986

987 if(avctx->channels != 2)

988 return AVERROR_INVALIDDATA;

989

990 current_left_sample = sign_extend(bytestream2_get_le16u(&gb), 16);

991 previous_left_sample = sign_extend(bytestream2_get_le16u(&gb), 16);

992 current_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);

993 previous_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);

994

995 for (count1 = 0; count1 < nb_samples / 28; count1++) {

996 int byte = bytestream2_get_byteu(&gb);

997 coeff1l = ea_adpcm_table[ byte >> 4 ];

998 coeff2l = ea_adpcm_table[(byte >> 4 ) + 4];

999 coeff1r = ea_adpcm_table[ byte & 0x0F];

1000 coeff2r = ea_adpcm_table[(byte & 0x0F) + 4];

1001

1002 byte = bytestream2_get_byteu(&gb);

1003 shift_left = 20 - (byte >> 4);

1004 shift_right = 20 - (byte & 0x0F);

1005

1006 for (count2 = 0; count2 < 28; count2++) {

1007 byte = bytestream2_get_byteu(&gb);

1008 next_left_sample = sign_extend(byte >> 4, 4) << shift_left;

1009 next_right_sample = sign_extend(byte, 4) << shift_right;

1010

1011 next_left_sample = (next_left_sample +

1012 (current_left_sample * coeff1l) +

1013 (previous_left_sample * coeff2l) + 0x80) >> 8;

1014 next_right_sample = (next_right_sample +

1015 (current_right_sample * coeff1r) +

1016 (previous_right_sample * coeff2r) + 0x80) >> 8;

1017

1018 previous_left_sample = current_left_sample;

1019 current_left_sample = av_clip_int16(next_left_sample);

1020 previous_right_sample = current_right_sample;

1021 current_right_sample = av_clip_int16(next_right_sample);

1022 *samples++ = current_left_sample;

1023 *samples++ = current_right_sample;

1024 }

1025 }

1026

1027 bytestream2_skip(&gb, 2); // Skip terminating 0x0000

1028

1029 break;

1030 }

1031 case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

1032 {

1033 int coeff[2][2], shift[2];

1034

1035 for(channel = 0; channel < avctx->channels; channel++) {

1036 int byte = bytestream2_get_byteu(&gb);

1037 for (i=0; i<2; i++)

1038 coeff[channel][i] = ea_adpcm_table[(byte >> 4) + 4*i];

1039 shift[channel] = 20 - (byte & 0x0F);

1040 }

1041 for (count1 = 0; count1 < nb_samples / 2; count1++) {

1042 int byte[2];

1043

1044 byte[0] = bytestream2_get_byteu(&gb);

1045 if (st) byte[1] = bytestream2_get_byteu(&gb);

1046 for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */

1047 for(channel = 0; channel < avctx->channels; channel++) {

1048 int sample = sign_extend(byte[channel] >> i, 4) << shift[channel];

1049 sample = (sample +

1050 c->status[channel].sample1 * coeff[channel][0] +

1051 c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;

1052 c->status[channel].sample2 = c->status[channel].sample1;

1053 c->status[channel].sample1 = av_clip_int16(sample);

1054 *samples++ = c->status[channel].sample1;

1055 }

1056 }

1057 }

1058 bytestream2_seek(&gb, 0, SEEK_END);

1059 break;

1060 }

1061 case AV_CODEC_ID_ADPCM_EA_R1:

1062 case AV_CODEC_ID_ADPCM_EA_R2:

1063 case AV_CODEC_ID_ADPCM_EA_R3: {

1064 /* channel numbering

1065 2chan: 0=fl, 1=fr

1066 4chan: 0=fl, 1=rl, 2=fr, 3=rr

1067 6chan: 0=fl, 1=c, 2=fr, 3=rl, 4=rr, 5=sub */

1068 const int big_endian = avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R3;

1069 int previous_sample, current_sample, next_sample;

1070 int coeff1, coeff2;

1071 int shift;

1072 unsigned int channel;

1073 uint16_t *samplesC;

1074 int count = 0;

1075 int offsets[6];

1076

1077 for (channel=0; channel<avctx->channels; channel++)

1078 offsets[channel] = (big_endian ? bytestream2_get_be32(&gb) :

1079 bytestream2_get_le32(&gb)) +

1080 (avctx->channels + 1) * 4;

1081

1082 for (channel=0; channel<avctx->channels; channel++) {

1083 bytestream2_seek(&gb, offsets[channel], SEEK_SET);

1084 samplesC = samples_p[channel];

1085

1086 if (avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R1) {

1087 current_sample = sign_extend(bytestream2_get_le16(&gb), 16);

1088 previous_sample = sign_extend(bytestream2_get_le16(&gb), 16);

1089 } else {

1090 current_sample = c->status[channel].predictor;

1091 previous_sample = c->status[channel].prev_sample;

1092 }

1093

1094 for (count1 = 0; count1 < nb_samples / 28; count1++) {

1095 int byte = bytestream2_get_byte(&gb);

1096 if (byte == 0xEE) { /* only seen in R2 and R3 */

1097 current_sample = sign_extend(bytestream2_get_be16(&gb), 16);

1098 previous_sample = sign_extend(bytestream2_get_be16(&gb), 16);

1099

1100 for (count2=0; count2<28; count2++)

1101 *samplesC++ = sign_extend(bytestream2_get_be16(&gb), 16);

1102 } else {

1103 coeff1 = ea_adpcm_table[ byte >> 4 ];

1104 coeff2 = ea_adpcm_table[(byte >> 4) + 4];

1105 shift = 20 - (byte & 0x0F);

1106

1107 for (count2=0; count2<28; count2++) {

1108 if (count2 & 1)

1109 next_sample = sign_extend(byte, 4) << shift;

1110 else {

1111 byte = bytestream2_get_byte(&gb);

1112 next_sample = sign_extend(byte >> 4, 4) << shift;

1113 }

1114

1115 next_sample += (current_sample * coeff1) +

1116 (previous_sample * coeff2);

1117 next_sample = av_clip_int16(next_sample >> 8);

1118

1119 previous_sample = current_sample;

1120 current_sample = next_sample;

1121 *samplesC++ = current_sample;

1122 }

1123 }

1124 }

1125 if (!count) {

1126 count = count1;

1127 } else if (count != count1) {

1128 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");

1129 count = FFMAX(count, count1);

1130 }

1131

1132 if (avctx->codec->id != AV_CODEC_ID_ADPCM_EA_R1) {

1133 c->status[channel].predictor = current_sample;

1134 c->status[channel].prev_sample = previous_sample;

1135 }

1136 }

1137

1138 c->frame.nb_samples = count * 28;

1139 bytestream2_seek(&gb, 0, SEEK_END);

1140 break;

1141 }

1142 case AV_CODEC_ID_ADPCM_EA_XAS:

1143 for (channel=0; channel<avctx->channels; channel++) {

1144 int coeff[2][4], shift[4];

1145 int16_t *s = samples_p[channel];

1146 for (n = 0; n < 4; n++, s += 32) {

1147 int val = sign_extend(bytestream2_get_le16u(&gb), 16);

1148 for (i=0; i<2; i++)

1149 coeff[i][n] = ea_adpcm_table[(val&0x0F)+4*i];

1150 s[0] = val & ~0x0F;

1151

1152 val = sign_extend(bytestream2_get_le16u(&gb), 16);

1153 shift[n] = 20 - (val & 0x0F);

1154 s[1] = val & ~0x0F;

1155 }

1156

1157 for (m=2; m<32; m+=2) {

1158 s = &samples_p[channel][m];

1159 for (n = 0; n < 4; n++, s += 32) {

1160 int level, pred;

1161 int byte = bytestream2_get_byteu(&gb);

1162

1163 level = sign_extend(byte >> 4, 4) << shift[n];

1164 pred = s[-1] * coeff[0][n] + s[-2] * coeff[1][n];

1165 s[0] = av_clip_int16((level + pred + 0x80) >> 8);

1166

1167 level = sign_extend(byte, 4) << shift[n];

1168 pred = s[0] * coeff[0][n] + s[-1] * coeff[1][n];

1169 s[1] = av_clip_int16((level + pred + 0x80) >> 8);

1170 }

1171 }

1172 }

1173 break;

1174 case AV_CODEC_ID_ADPCM_IMA_AMV:

1175 c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

1176 c->status[0].step_index = bytestream2_get_le16u(&gb);

1177 bytestream2_skipu(&gb, 4);

1178 if (c->status[0].step_index > 88u) {

1179 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

1180 c->status[0].step_index);

1181 return AVERROR_INVALIDDATA;

1182 }

1183

1184 for (n = nb_samples >> (1 - st); n > 0; n--) {

1185 int v = bytestream2_get_byteu(&gb);

1186

1187 *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);

1188 *samples++ = adpcm_ima_expand_nibble(&c->status[0], v & 0xf, 3);

1189 }

1190 break;

1191 case AV_CODEC_ID_ADPCM_IMA_SMJPEG:

1192 for (i = 0; i < avctx->channels; i++) {

1193 c->status[i].predictor = sign_extend(bytestream2_get_be16u(&gb), 16);

1194 c->status[i].step_index = bytestream2_get_byteu(&gb);

1195 bytestream2_skipu(&gb, 1);

1196 if (c->status[i].step_index > 88u) {

1197 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

1198 c->status[i].step_index);

1199 return AVERROR_INVALIDDATA;

1200 }

1201 }

1202

1203 for (n = nb_samples >> (1 - st); n > 0; n--) {

1204 int v = bytestream2_get_byteu(&gb);

1205

1206 *samples++ = adpcm_ima_qt_expand_nibble(&c->status[0 ], v >> 4, 3);

1207 *samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0xf, 3);

1208 }

1209 break;

1210 case AV_CODEC_ID_ADPCM_CT:

1211 for (n = nb_samples >> (1 - st); n > 0; n--) {

1212 int v = bytestream2_get_byteu(&gb);

1213 *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4 );

1214 *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);

1215 }

1216 break;

1217 case AV_CODEC_ID_ADPCM_SBPRO_4:

1218 case AV_CODEC_ID_ADPCM_SBPRO_3:

1219 case AV_CODEC_ID_ADPCM_SBPRO_2:

1220 if (!c->status[0].step_index) {

1221 /* the first byte is a raw sample */

1222 *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

1223 if (st)

1224 *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

1225 c->status[0].step_index = 1;

1226 nb_samples--;

1227 }

1228 if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_4) {

1229 for (n = nb_samples >> (1 - st); n > 0; n--) {

1230 int byte = bytestream2_get_byteu(&gb);

1231 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

1232 byte >> 4, 4, 0);

1233 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

1234 byte & 0x0F, 4, 0);

1235 }

1236 } else if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_3) {

1237 for (n = nb_samples / 3; n > 0; n--) {

1238 int byte = bytestream2_get_byteu(&gb);

1239 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

1240 byte >> 5 , 3, 0);

1241 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

1242 (byte >> 2) & 0x07, 3, 0);

1243 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

1244 byte & 0x03, 2, 0);

1245 }

1246 } else {

1247 for (n = nb_samples >> (2 - st); n > 0; n--) {

1248 int byte = bytestream2_get_byteu(&gb);

1249 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

1250 byte >> 6 , 2, 2);

1251 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

1252 (byte >> 4) & 0x03, 2, 2);

1253 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

1254 (byte >> 2) & 0x03, 2, 2);

1255 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

1256 byte & 0x03, 2, 2);

1257 }

1258 }

1259 break;

1260 case AV_CODEC_ID_ADPCM_SWF:

1261 adpcm_swf_decode(avctx, buf, buf_size, samples);

1262 bytestream2_seek(&gb, 0, SEEK_END);

1263 break;

1264 case AV_CODEC_ID_ADPCM_YAMAHA:

1265 for (n = nb_samples >> (1 - st); n > 0; n--) {

1266 int v = bytestream2_get_byteu(&gb);

1267 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);

1268 *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4 );

1269 }

1270 break;

1271 case AV_CODEC_ID_ADPCM_AFC:

1272 {

1273 int samples_per_block;

1274 int blocks;

1275

1276 if (avctx->extradata && avctx->extradata_size == 1 && avctx->extradata[0]) {

1277 samples_per_block = avctx->extradata[0] / 16;

1278 blocks = nb_samples / avctx->extradata[0];

1279 } else {

1280 samples_per_block = nb_samples / 16;

1281 blocks = 1;

1282 }

1283

1284 for (m = 0; m < blocks; m++) {

1285 for (channel = 0; channel < avctx->channels; channel++) {

1286 int prev1 = c->status[channel].sample1;

1287 int prev2 = c->status[channel].sample2;

1288

1289 samples = samples_p[channel] + m * 16;

1290 /* Read in every sample for this channel. */

1291 for (i = 0; i < samples_per_block; i++) {

1292 int byte = bytestream2_get_byteu(&gb);

1293 int scale = 1 << (byte >> 4);

1294 int index = byte & 0xf;

1295 int factor1 = ff_adpcm_afc_coeffs[0][index];

1296 int factor2 = ff_adpcm_afc_coeffs[1][index];

1297

1298 /* Decode 16 samples. */

1299 for (n = 0; n < 16; n++) {

1300 int32_t sampledat;

1301

1302 if (n & 1) {

1303 sampledat = sign_extend(byte, 4);

1304 } else {

1305 byte = bytestream2_get_byteu(&gb);

1306 sampledat = sign_extend(byte >> 4, 4);

1307 }

1308

1309 sampledat = ((prev1 * factor1 + prev2 * factor2) +

1310 ((sampledat * scale) << 11)) >> 11;

1311 *samples = av_clip_int16(sampledat);

1312 prev2 = prev1;

1313 prev1 = *samples++;

1314 }

1315 }

1316

1317 c->status[channel].sample1 = prev1;

1318 c->status[channel].sample2 = prev2;

1319 }

1320 }

1321 bytestream2_seek(&gb, 0, SEEK_END);

1322 break;

1323 }

1324 case AV_CODEC_ID_ADPCM_THP:

1325 {

1326 int table[6][16];

1327 int ch;

1328

1329 for (i = 0; i < avctx->channels; i++)

1330 for (n = 0; n < 16; n++)

1331 table[i][n] = sign_extend(bytestream2_get_be16u(&gb), 16);

1332

1333 /* Initialize the previous sample. */

1334 for (i = 0; i < avctx->channels; i++) {

1335 c->status[i].sample1 = sign_extend(bytestream2_get_be16u(&gb), 16);

1336 c->status[i].sample2 = sign_extend(bytestream2_get_be16u(&gb), 16);

1337 }

1338

1339 for (ch = 0; ch < avctx->channels; ch++) {

1340 samples = samples_p[ch];

1341

1342 /* Read in every sample for this channel. */

1343 for (i = 0; i < nb_samples / 14; i++) {

1344 int byte = bytestream2_get_byteu(&gb);

1345 int index = (byte >> 4) & 7;

1346 unsigned int exp = byte & 0x0F;

1347 int factor1 = table[ch][index * 2];

1348 int factor2 = table[ch][index * 2 + 1];

1349

1350 /* Decode 14 samples. */

1351 for (n = 0; n < 14; n++) {

1352 int32_t sampledat;

1353

1354 if (n & 1) {

1355 sampledat = sign_extend(byte, 4);

1356 } else {

1357 byte = bytestream2_get_byteu(&gb);

1358 sampledat = sign_extend(byte >> 4, 4);

1359 }

1360

1361 sampledat = ((c->status[ch].sample1 * factor1

1362 + c->status[ch].sample2 * factor2) >> 11) + (sampledat << exp);

1363 *samples = av_clip_int16(sampledat);

1364 c->status[ch].sample2 = c->status[ch].sample1;

1365 c->status[ch].sample1 = *samples++;

1366 }

1367 }

1368 }

1369 break;

1370 }

1371

1372 default:

1373 return -1;

1374 }

1375

1376 if (avpkt->size && bytestream2_tell(&gb) == 0) {

1377 av_log(avctx, AV_LOG_ERROR, "Nothing consumed\n");

1378 return AVERROR_INVALIDDATA;

1379 }

1380

1381 *got_frame_ptr = 1;

1382 *(AVFrame *)data = c->frame;

1383

1384 return bytestream2_tell(&gb);

1385 }

1386

1387

1388 static const enum AVSampleFormat sample_fmts_s16[] = { AV_SAMPLE_FMT_S16,

1389 AV_SAMPLE_FMT_NONE };

1390 static const enum AVSampleFormat sample_fmts_s16p[] = { AV_SAMPLE_FMT_S16,

1391 AV_SAMPLE_FMT_NONE };

1392 static const enum AVSampleFormat sample_fmts_both[] = { AV_SAMPLE_FMT_S16,

1393 AV_SAMPLE_FMT_S16P,

1394 AV_SAMPLE_FMT_NONE };

1395

1396 #define ADPCM_DECODER(id_, sample_fmts_, name_, long_name_) \

1397 AVCodec ff_ ## name_ ## _decoder = { \

1398 .name = #name_, \

1399 .type = AVMEDIA_TYPE_AUDIO, \

1400 .id = id_, \

1401 .priv_data_size = sizeof(ADPCMDecodeContext), \

1402 .init = adpcm_decode_init, \

1403 .decode = adpcm_decode_frame, \

1404 .capabilities = CODEC_CAP_DR1, \

1405 .long_name = NULL_IF_CONFIG_SMALL(long_name_), \

1406 .sample_fmts = sample_fmts_, \

1407 }

1408

1409 /* Note: Do not forget to add new entries to the Makefile as well. */

1410 ADPCM_DECODER(AV_CODEC_ID_ADPCM_4XM, sample_fmts_s16p, adpcm_4xm, "ADPCM 4X Movie");

1411 ADPCM_DECODER(AV_CODEC_ID_ADPCM_AFC, sample_fmts_s16p, adpcm_afc, "ADPCM Nintendo Gamecube AFC");

1412 ADPCM_DECODER(AV_CODEC_ID_ADPCM_CT, sample_fmts_s16, adpcm_ct, "ADPCM Creative Technology");

1413 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA, sample_fmts_s16, adpcm_ea, "ADPCM Electronic Arts");

1414 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_MAXIS_XA, sample_fmts_s16, adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");

1415 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R1, sample_fmts_s16p, adpcm_ea_r1, "ADPCM Electronic Arts R1");

1416 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R2, sample_fmts_s16p, adpcm_ea_r2, "ADPCM Electronic Arts R2");

1417 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3, sample_fmts_s16p, adpcm_ea_r3, "ADPCM Electronic Arts R3");

1418 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS, sample_fmts_s16p, adpcm_ea_xas, "ADPCM Electronic Arts XAS");

1419 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV, sample_fmts_s16, adpcm_ima_amv, "ADPCM IMA AMV");

1420 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC, sample_fmts_s16, adpcm_ima_apc, "ADPCM IMA CRYO APC");

1421 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3, sample_fmts_s16, adpcm_ima_dk3, "ADPCM IMA Duck DK3");

1422 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4, sample_fmts_s16, adpcm_ima_dk4, "ADPCM IMA Duck DK4");

1423 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_EACS, sample_fmts_s16, adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");

1424 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_SEAD, sample_fmts_s16, adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");

1425 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS, sample_fmts_s16, adpcm_ima_iss, "ADPCM IMA Funcom ISS");

1426 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_OKI, sample_fmts_s16, adpcm_ima_oki, "ADPCM IMA Dialogic OKI");

1427 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT, sample_fmts_s16p, adpcm_ima_qt, "ADPCM IMA QuickTime");

1428 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG, sample_fmts_s16, adpcm_ima_smjpeg, "ADPCM IMA Loki SDL MJPEG");

1429 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV, sample_fmts_s16p, adpcm_ima_wav, "ADPCM IMA WAV");

1430 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS, sample_fmts_both, adpcm_ima_ws, "ADPCM IMA Westwood");

1431 ADPCM_DECODER(AV_CODEC_ID_ADPCM_MS, sample_fmts_s16, adpcm_ms, "ADPCM Microsoft");

1432 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_2, sample_fmts_s16, adpcm_sbpro_2, "ADPCM Sound Blaster Pro 2-bit");

1433 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_3, sample_fmts_s16, adpcm_sbpro_3, "ADPCM Sound Blaster Pro 2.6-bit");

1434 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_4, sample_fmts_s16, adpcm_sbpro_4, "ADPCM Sound Blaster Pro 4-bit");

1435 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SWF, sample_fmts_s16, adpcm_swf, "ADPCM Shockwave Flash");

1436 ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP, sample_fmts_s16p, adpcm_thp, "ADPCM Nintendo Gamecube THP");

1437 ADPCM_DECODER(AV_CODEC_ID_ADPCM_XA, sample_fmts_s16p, adpcm_xa, "ADPCM CDROM XA");

1438 ADPCM_DECODER(AV_CODEC_ID_ADPCM_YAMAHA, sample_fmts_s16, adpcm_yamaha, "ADPCM Yamaha");

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