FFmpeg: libavcodec/vmdav.c Source File

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libavcodec

vmdav.c

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1 /*

2 * Sierra VMD Audio & Video Decoders

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 */

22 /**

23 * @file

24 * Sierra VMD audio & video decoders

25 * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)

26 * for more information on the Sierra VMD format, visit:

27 * http://www.pcisys.net/~melanson/codecs/

28 *

29 * The video decoder outputs PAL8 colorspace data. The decoder expects

30 * a 0x330-byte VMD file header to be transmitted via extradata during

31 * codec initialization. Each encoded frame that is sent to this decoder

32 * is expected to be prepended with the appropriate 16-byte frame

33 * information record from the VMD file.

34 *

35 * The audio decoder, like the video decoder, expects each encoded data

36 * chunk to be prepended with the appropriate 16-byte frame information

37 * record from the VMD file. It does not require the 0x330-byte VMD file

38 * header, but it does need the audio setup parameters passed in through

39 * normal libavcodec API means.

40 */

42 #include <stdio.h>

43 #include <stdlib.h>

44 #include <string.h>

46 #include "libavutil/avassert.h"

47 #include "libavutil/channel_layout.h"

48 #include "libavutil/common.h"

49 #include "libavutil/intreadwrite.h"

50 #include "avcodec.h"

51 #include "internal.h"

52 #include "bytestream.h"

54 #define VMD_HEADER_SIZE 0x330

55 #define PALETTE_COUNT 256

57 /*

58 * Video Decoder

59 */

61 typedef struct VmdVideoContext {

63 AVCodecContext *avctx;

64 AVFrame prev_frame;

66 const unsigned char *buf;

67 int size;

69 unsigned char palette[PALETTE_COUNT * 4];

70 unsigned char *unpack_buffer;

71 int unpack_buffer_size;

73 int x_off, y_off;

74 } VmdVideoContext;

76 #define QUEUE_SIZE 0x1000

77 #define QUEUE_MASK 0x0FFF

79 static void lz_unpack(const unsigned char *src, int src_len,

80 unsigned char *dest, int dest_len)

81 {

82 unsigned char *d;

83 unsigned char *d_end;

84 unsigned char queue[QUEUE_SIZE];

85 unsigned int qpos;

86 unsigned int dataleft;

87 unsigned int chainofs;

88 unsigned int chainlen;

89 unsigned int speclen;

90 unsigned char tag;

91 unsigned int i, j;

92 GetByteContext gb;

94 bytestream2_init(&gb, src, src_len);

95 d = dest;

96 d_end = d + dest_len;

97 dataleft = bytestream2_get_le32(&gb);

98 memset(queue, 0x20, QUEUE_SIZE);

99 if (bytestream2_get_bytes_left(&gb) < 4)

100 return;

101 if (bytestream2_peek_le32(&gb) == 0x56781234) {

102 bytestream2_skipu(&gb, 4);

103 qpos = 0x111;

104 speclen = 0xF + 3;

105 } else {

106 qpos = 0xFEE;

107 speclen = 100; /* no speclen */

108 }

109

110 while (dataleft > 0 && bytestream2_get_bytes_left(&gb) > 0) {

111 tag = bytestream2_get_byteu(&gb);

112 if ((tag == 0xFF) && (dataleft > 8)) {

113 if (d_end - d < 8 || bytestream2_get_bytes_left(&gb) < 8)

114 return;

115 for (i = 0; i < 8; i++) {

116 queue[qpos++] = *d++ = bytestream2_get_byteu(&gb);

117 qpos &= QUEUE_MASK;

118 }

119 dataleft -= 8;

120 } else {

121 for (i = 0; i < 8; i++) {

122 if (dataleft == 0)

123 break;

124 if (tag & 0x01) {

125 if (d_end - d < 1 || bytestream2_get_bytes_left(&gb) < 1)

126 return;

127 queue[qpos++] = *d++ = bytestream2_get_byteu(&gb);

128 qpos &= QUEUE_MASK;

129 dataleft--;

130 } else {

131 chainofs = bytestream2_get_byte(&gb);

132 chainofs |= ((bytestream2_peek_byte(&gb) & 0xF0) << 4);

133 chainlen = (bytestream2_get_byte(&gb) & 0x0F) + 3;

134 if (chainlen == speclen) {

135 chainlen = bytestream2_get_byte(&gb) + 0xF + 3;

136 }

137 if (d_end - d < chainlen)

138 return;

139 for (j = 0; j < chainlen; j++) {

140 *d = queue[chainofs++ & QUEUE_MASK];

141 queue[qpos++] = *d++;

142 qpos &= QUEUE_MASK;

143 }

144 dataleft -= chainlen;

145 }

146 tag >>= 1;

147 }

148 }

149 }

150 }

151 static int rle_unpack(const unsigned char *src, unsigned char *dest,

152 int src_count, int src_size, int dest_len)

153 {

154 unsigned char *pd;

155 int i, l, used = 0;

156 unsigned char *dest_end = dest + dest_len;

157 GetByteContext gb;

158 uint16_t run_val;

159

160 bytestream2_init(&gb, src, src_size);

161 pd = dest;

162 if (src_count & 1) {

163 if (bytestream2_get_bytes_left(&gb) < 1)

164 return 0;

165 *pd++ = bytestream2_get_byteu(&gb);

166 used++;

167 }

168

169 do {

170 if (bytestream2_get_bytes_left(&gb) < 1)

171 break;

172 l = bytestream2_get_byteu(&gb);

173 if (l & 0x80) {

174 l = (l & 0x7F) * 2;

175 if (dest_end - pd < l || bytestream2_get_bytes_left(&gb) < l)

176 return bytestream2_tell(&gb);

177 bytestream2_get_bufferu(&gb, pd, l);

178 pd += l;

179 } else {

180 if (dest_end - pd < 2*l || bytestream2_get_bytes_left(&gb) < 2)

181 return bytestream2_tell(&gb);

182 run_val = bytestream2_get_ne16(&gb);

183 for (i = 0; i < l; i++) {

184 AV_WN16(pd, run_val);

185 pd += 2;

186 }

187 l *= 2;

188 }

189 used += l;

190 } while (used < src_count);

191

192 return bytestream2_tell(&gb);

193 }

194

195 static int vmd_decode(VmdVideoContext *s, AVFrame *frame)

196 {

197 int i;

198 unsigned int *palette32;

199 unsigned char r, g, b;

200

201 GetByteContext gb;

202

203 unsigned char meth;

204 unsigned char *dp; /* pointer to current frame */

205 unsigned char *pp; /* pointer to previous frame */

206 unsigned char len;

207 int ofs;

208

209 int frame_x, frame_y;

210 int frame_width, frame_height;

211

212 frame_x = AV_RL16(&s->buf[6]);

213 frame_y = AV_RL16(&s->buf[8]);

214 frame_width = AV_RL16(&s->buf[10]) - frame_x + 1;

215 frame_height = AV_RL16(&s->buf[12]) - frame_y + 1;

216

217 if ((frame_width == s->avctx->width && frame_height == s->avctx->height) &&

218 (frame_x || frame_y)) {

219

220 s->x_off = frame_x;

221 s->y_off = frame_y;

222 }

223 frame_x -= s->x_off;

224 frame_y -= s->y_off;

225

226 if (frame_x < 0 || frame_width < 0 ||

227 frame_x >= s->avctx->width ||

228 frame_width > s->avctx->width ||

229 frame_x + frame_width > s->avctx->width) {

230 av_log(s->avctx, AV_LOG_ERROR,

231 "Invalid horizontal range %d-%d\n",

232 frame_x, frame_width);

233 return AVERROR_INVALIDDATA;

234 }

235 if (frame_y < 0 || frame_height < 0 ||

236 frame_y >= s->avctx->height ||

237 frame_height > s->avctx->height ||

238 frame_y + frame_height > s->avctx->height) {

239 av_log(s->avctx, AV_LOG_ERROR,

240 "Invalid vertical range %d-%d\n",

241 frame_x, frame_width);

242 return AVERROR_INVALIDDATA;

243 }

244

245 /* if only a certain region will be updated, copy the entire previous

246 * frame before the decode */

247 if (s->prev_frame.data[0] &&

248 (frame_x || frame_y || (frame_width != s->avctx->width) ||

249 (frame_height != s->avctx->height))) {

250

251 memcpy(frame->data[0], s->prev_frame.data[0],

252 s->avctx->height * frame->linesize[0]);

253 }

254

255 /* check if there is a new palette */

256 bytestream2_init(&gb, s->buf + 16, s->size - 16);

257 if (s->buf[15] & 0x02) {

258 bytestream2_skip(&gb, 2);

259 palette32 = (unsigned int *)s->palette;

260 if (bytestream2_get_bytes_left(&gb) >= PALETTE_COUNT * 3) {

261 for (i = 0; i < PALETTE_COUNT; i++) {

262 r = bytestream2_get_byteu(&gb) * 4;

263 g = bytestream2_get_byteu(&gb) * 4;

264 b = bytestream2_get_byteu(&gb) * 4;

265 palette32[i] = 0xFFU << 24 | (r << 16) | (g << 8) | (b);

266 palette32[i] |= palette32[i] >> 6 & 0x30303;

267 }

268 } else {

269 av_log(s->avctx, AV_LOG_ERROR, "Incomplete palette\n");

270 return AVERROR_INVALIDDATA;

271 }

272 }

273

274 if (!s->size)

275 return 0;

276

277 /* originally UnpackFrame in VAG's code */

278 if (bytestream2_get_bytes_left(&gb) < 1)

279 return AVERROR_INVALIDDATA;

280 meth = bytestream2_get_byteu(&gb);

281 if (meth & 0x80) {

282 if (!s->unpack_buffer_size) {

283 av_log(s->avctx, AV_LOG_ERROR,

284 "Trying to unpack LZ-compressed frame with no LZ buffer\n");

285 return AVERROR_INVALIDDATA;

286 }

287 lz_unpack(gb.buffer, bytestream2_get_bytes_left(&gb),

288 s->unpack_buffer, s->unpack_buffer_size);

289 meth &= 0x7F;

290 bytestream2_init(&gb, s->unpack_buffer, s->unpack_buffer_size);

291 }

292

293 dp = &frame->data[0][frame_y * frame->linesize[0] + frame_x];

294 pp = &s->prev_frame.data[0][frame_y * s->prev_frame.linesize[0] + frame_x];

295 switch (meth) {

296 case 1:

297 for (i = 0; i < frame_height; i++) {

298 ofs = 0;

299 do {

300 len = bytestream2_get_byte(&gb);

301 if (len & 0x80) {

302 len = (len & 0x7F) + 1;

303 if (ofs + len > frame_width ||

304 bytestream2_get_bytes_left(&gb) < len)

305 return AVERROR_INVALIDDATA;

306 bytestream2_get_bufferu(&gb, &dp[ofs], len);

307 ofs += len;

308 } else {

309 /* interframe pixel copy */

310 if (ofs + len + 1 > frame_width || !s->prev_frame.data[0])

311 return AVERROR_INVALIDDATA;

312 memcpy(&dp[ofs], &pp[ofs], len + 1);

313 ofs += len + 1;

314 }

315 } while (ofs < frame_width);

316 if (ofs > frame_width) {

317 av_log(s->avctx, AV_LOG_ERROR,

318 "offset > width (%d > %d)\n",

319 ofs, frame_width);

320 return AVERROR_INVALIDDATA;

321 }

322 dp += frame->linesize[0];

323 pp += s->prev_frame.linesize[0];

324 }

325 break;

326

327 case 2:

328 for (i = 0; i < frame_height; i++) {

329 bytestream2_get_buffer(&gb, dp, frame_width);

330 dp += frame->linesize[0];

331 pp += s->prev_frame.linesize[0];

332 }

333 break;

334

335 case 3:

336 for (i = 0; i < frame_height; i++) {

337 ofs = 0;

338 do {

339 len = bytestream2_get_byte(&gb);

340 if (len & 0x80) {

341 len = (len & 0x7F) + 1;

342 if (bytestream2_peek_byte(&gb) == 0xFF) {

343 int slen = len;

344 bytestream2_get_byte(&gb);

345 len = rle_unpack(gb.buffer, &dp[ofs],

346 len, bytestream2_get_bytes_left(&gb),

347 frame_width - ofs);

348 ofs += slen;

349 bytestream2_skip(&gb, len);

350 } else {

351 bytestream2_get_buffer(&gb, &dp[ofs], len);

352 ofs += len;

353 }

354 } else {

355 /* interframe pixel copy */

356 if (ofs + len + 1 > frame_width || !s->prev_frame.data[0])

357 return AVERROR_INVALIDDATA;

358 memcpy(&dp[ofs], &pp[ofs], len + 1);

359 ofs += len + 1;

360 }

361 } while (ofs < frame_width);

362 if (ofs > frame_width) {

363 av_log(s->avctx, AV_LOG_ERROR,

364 "offset > width (%d > %d)\n",

365 ofs, frame_width);

366 return AVERROR_INVALIDDATA;

367 }

368 dp += frame->linesize[0];

369 pp += s->prev_frame.linesize[0];

370 }

371 break;

372 }

373 return 0;

374 }

375

376 static av_cold int vmdvideo_decode_init(AVCodecContext *avctx)

377 {

378 VmdVideoContext *s = avctx->priv_data;

379 int i;

380 unsigned int *palette32;

381 int palette_index = 0;

382 unsigned char r, g, b;

383 unsigned char *vmd_header;

384 unsigned char *raw_palette;

385

386 s->avctx = avctx;

387 avctx->pix_fmt = AV_PIX_FMT_PAL8;

388

389 /* make sure the VMD header made it */

390 if (s->avctx->extradata_size != VMD_HEADER_SIZE) {

391 av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n",

392 VMD_HEADER_SIZE);

393 return AVERROR_INVALIDDATA;

394 }

395 vmd_header = (unsigned char *)avctx->extradata;

396

397 s->unpack_buffer_size = AV_RL32(&vmd_header[800]);

398 if (s->unpack_buffer_size) {

399 s->unpack_buffer = av_malloc(s->unpack_buffer_size);

400 if (!s->unpack_buffer)

401 return AVERROR(ENOMEM);

402 }

403

404 /* load up the initial palette */

405 raw_palette = &vmd_header[28];

406 palette32 = (unsigned int *)s->palette;

407 for (i = 0; i < PALETTE_COUNT; i++) {

408 r = raw_palette[palette_index++] * 4;

409 g = raw_palette[palette_index++] * 4;

410 b = raw_palette[palette_index++] * 4;

411 palette32[i] = 0xFFU << 24 | (r << 16) | (g << 8) | (b);

412 palette32[i] |= palette32[i] >> 6 & 0x30303;

413 }

414

415 avcodec_get_frame_defaults(&s->prev_frame);

416

417 return 0;

418 }

419

420 static int vmdvideo_decode_frame(AVCodecContext *avctx,

421 void *data, int *got_frame,

422 AVPacket *avpkt)

423 {

424 const uint8_t *buf = avpkt->data;

425 int buf_size = avpkt->size;

426 VmdVideoContext *s = avctx->priv_data;

427 AVFrame *frame = data;

428 int ret;

429

430 s->buf = buf;

431 s->size = buf_size;

432

433 if (buf_size < 16)

434 return AVERROR_INVALIDDATA;

435

436 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)

437 return ret;

438

439 if ((ret = vmd_decode(s, frame)) < 0)

440 return ret;

441

442 /* make the palette available on the way out */

443 memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);

444

445 /* shuffle frames */

446 av_frame_unref(&s->prev_frame);

447 if ((ret = av_frame_ref(&s->prev_frame, frame)) < 0)

448 return ret;

449

450 *got_frame = 1;

451

452 /* report that the buffer was completely consumed */

453 return buf_size;

454 }

455

456 static av_cold int vmdvideo_decode_end(AVCodecContext *avctx)

457 {

458 VmdVideoContext *s = avctx->priv_data;

459

460 av_frame_unref(&s->prev_frame);

461 av_free(s->unpack_buffer);

462

463 return 0;

464 }

465

466

467 /*

468 * Audio Decoder

469 */

470

471 #define BLOCK_TYPE_AUDIO 1

472 #define BLOCK_TYPE_INITIAL 2

473 #define BLOCK_TYPE_SILENCE 3

474

475 typedef struct VmdAudioContext {

476 int out_bps;

477 int chunk_size;

478 } VmdAudioContext;

479

480 static const uint16_t vmdaudio_table[128] = {

481 0x000, 0x008, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080,

482 0x090, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x110, 0x120,

483 0x130, 0x140, 0x150, 0x160, 0x170, 0x180, 0x190, 0x1A0, 0x1B0, 0x1C0,

484 0x1D0, 0x1E0, 0x1F0, 0x200, 0x208, 0x210, 0x218, 0x220, 0x228, 0x230,

485 0x238, 0x240, 0x248, 0x250, 0x258, 0x260, 0x268, 0x270, 0x278, 0x280,

486 0x288, 0x290, 0x298, 0x2A0, 0x2A8, 0x2B0, 0x2B8, 0x2C0, 0x2C8, 0x2D0,

487 0x2D8, 0x2E0, 0x2E8, 0x2F0, 0x2F8, 0x300, 0x308, 0x310, 0x318, 0x320,

488 0x328, 0x330, 0x338, 0x340, 0x348, 0x350, 0x358, 0x360, 0x368, 0x370,

489 0x378, 0x380, 0x388, 0x390, 0x398, 0x3A0, 0x3A8, 0x3B0, 0x3B8, 0x3C0,

490 0x3C8, 0x3D0, 0x3D8, 0x3E0, 0x3E8, 0x3F0, 0x3F8, 0x400, 0x440, 0x480,

491 0x4C0, 0x500, 0x540, 0x580, 0x5C0, 0x600, 0x640, 0x680, 0x6C0, 0x700,

492 0x740, 0x780, 0x7C0, 0x800, 0x900, 0xA00, 0xB00, 0xC00, 0xD00, 0xE00,

493 0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000

494 };

495

496 static av_cold int vmdaudio_decode_init(AVCodecContext *avctx)

497 {

498 VmdAudioContext *s = avctx->priv_data;

499

500 if (avctx->channels < 1 || avctx->channels > 2) {

501 av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");

502 return AVERROR(EINVAL);

503 }

504 if (avctx->block_align < 1 || avctx->block_align % avctx->channels) {

505 av_log(avctx, AV_LOG_ERROR, "invalid block align\n");

506 return AVERROR(EINVAL);

507 }

508

509 avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO :

510 AV_CH_LAYOUT_STEREO;

511

512 if (avctx->bits_per_coded_sample == 16)

513 avctx->sample_fmt = AV_SAMPLE_FMT_S16;

514 else

515 avctx->sample_fmt = AV_SAMPLE_FMT_U8;

516 s->out_bps = av_get_bytes_per_sample(avctx->sample_fmt);

517

518 s->chunk_size = avctx->block_align + avctx->channels * (s->out_bps == 2);

519

520 av_log(avctx, AV_LOG_DEBUG, "%d channels, %d bits/sample, "

521 "block align = %d, sample rate = %d\n",

522 avctx->channels, avctx->bits_per_coded_sample, avctx->block_align,

523 avctx->sample_rate);

524

525 return 0;

526 }

527

528 static void decode_audio_s16(int16_t *out, const uint8_t *buf, int buf_size,

529 int channels)

530 {

531 int ch;

532 const uint8_t *buf_end = buf + buf_size;

533 int predictor[2];

534 int st = channels - 1;

535

536 /* decode initial raw sample */

537 for (ch = 0; ch < channels; ch++) {

538 predictor[ch] = (int16_t)AV_RL16(buf);

539 buf += 2;

540 *out++ = predictor[ch];

541 }

542

543 /* decode DPCM samples */

544 ch = 0;

545 while (buf < buf_end) {

546 uint8_t b = *buf++;

547 if (b & 0x80)

548 predictor[ch] -= vmdaudio_table[b & 0x7F];

549 else

550 predictor[ch] += vmdaudio_table[b];

551 predictor[ch] = av_clip_int16(predictor[ch]);

552 *out++ = predictor[ch];

553 ch ^= st;

554 }

555 }

556

557 static int vmdaudio_decode_frame(AVCodecContext *avctx, void *data,

558 int *got_frame_ptr, AVPacket *avpkt)

559 {

560 AVFrame *frame = data;

561 const uint8_t *buf = avpkt->data;

562 const uint8_t *buf_end;

563 int buf_size = avpkt->size;

564 VmdAudioContext *s = avctx->priv_data;

565 int block_type, silent_chunks, audio_chunks;

566 int ret;

567 uint8_t *output_samples_u8;

568 int16_t *output_samples_s16;

569

570 if (buf_size < 16) {

571 av_log(avctx, AV_LOG_WARNING, "skipping small junk packet\n");

572 *got_frame_ptr = 0;

573 return buf_size;

574 }

575

576 block_type = buf[6];

577 if (block_type < BLOCK_TYPE_AUDIO || block_type > BLOCK_TYPE_SILENCE) {

578 av_log(avctx, AV_LOG_ERROR, "unknown block type: %d\n", block_type);

579 return AVERROR(EINVAL);

580 }

581 buf += 16;

582 buf_size -= 16;

583

584 /* get number of silent chunks */

585 silent_chunks = 0;

586 if (block_type == BLOCK_TYPE_INITIAL) {

587 uint32_t flags;

588 if (buf_size < 4) {

589 av_log(avctx, AV_LOG_ERROR, "packet is too small\n");

590 return AVERROR(EINVAL);

591 }

592 flags = AV_RB32(buf);

593 silent_chunks = av_popcount(flags);

594 buf += 4;

595 buf_size -= 4;

596 } else if (block_type == BLOCK_TYPE_SILENCE) {

597 silent_chunks = 1;

598 buf_size = 0; // should already be zero but set it just to be sure

599 }

600

601 /* ensure output buffer is large enough */

602 audio_chunks = buf_size / s->chunk_size;

603

604 /* drop incomplete chunks */

605 buf_size = audio_chunks * s->chunk_size;

606

607 /* get output buffer */

608 frame->nb_samples = ((silent_chunks + audio_chunks) * avctx->block_align) /

609 avctx->channels;

610 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)

611 return ret;

612 output_samples_u8 = frame->data[0];

613 output_samples_s16 = (int16_t *)frame->data[0];

614

615 /* decode silent chunks */

616 if (silent_chunks > 0) {

617 int silent_size = avctx->block_align * silent_chunks;

618 av_assert0(avctx->block_align * silent_chunks <= frame->nb_samples * avctx->channels);

619

620 if (s->out_bps == 2) {

621 memset(output_samples_s16, 0x00, silent_size * 2);

622 output_samples_s16 += silent_size;

623 } else {

624 memset(output_samples_u8, 0x80, silent_size);

625 output_samples_u8 += silent_size;

626 }

627 }

628

629 /* decode audio chunks */

630 if (audio_chunks > 0) {

631 buf_end = buf + buf_size;

632 av_assert0((buf_size & (avctx->channels > 1)) == 0);

633 while (buf_end - buf >= s->chunk_size) {

634 if (s->out_bps == 2) {

635 decode_audio_s16(output_samples_s16, buf, s->chunk_size,

636 avctx->channels);

637 output_samples_s16 += avctx->block_align;

638 } else {

639 memcpy(output_samples_u8, buf, s->chunk_size);

640 output_samples_u8 += avctx->block_align;

641 }

642 buf += s->chunk_size;

643 }

644 }

645

646 *got_frame_ptr = 1;

647

648 return avpkt->size;

649 }

650

651

652 /*

653 * Public Data Structures

654 */

655

656 AVCodec ff_vmdvideo_decoder = {

657 .name = "vmdvideo",

658 .type = AVMEDIA_TYPE_VIDEO,

659 .id = AV_CODEC_ID_VMDVIDEO,

660 .priv_data_size = sizeof(VmdVideoContext),

661 .init = vmdvideo_decode_init,

662 .close = vmdvideo_decode_end,

663 .decode = vmdvideo_decode_frame,

664 .capabilities = CODEC_CAP_DR1,

665 .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"),

666 };

667

668 AVCodec ff_vmdaudio_decoder = {

669 .name = "vmdaudio",

670 .type = AVMEDIA_TYPE_AUDIO,

671 .id = AV_CODEC_ID_VMDAUDIO,

672 .priv_data_size = sizeof(VmdAudioContext),

673 .init = vmdaudio_decode_init,

674 .decode = vmdaudio_decode_frame,

675 .capabilities = CODEC_CAP_DR1,

676 .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD audio"),

677 };

Generated on Wed Jul 10 2013 23:48:07 for FFmpeg by doxygen 1.8.2