FFmpeg: libavcodec/indeo4.c Source File

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libavcodec

indeo4.c

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1 /*

2 * Indeo Video Interactive v4 compatible decoder

4 *

5 * This file is part of Libav.

6 *

7 * Libav 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 * Libav 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 Libav; 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 * Indeo Video Interactive version 4 decoder

25 *

26 * Indeo 4 data is usually transported within .avi or .mov files.

27 * Known FOURCCs: 'IV41'

28 */

30 #define BITSTREAM_READER_LE

31 #include "avcodec.h"

32 #include "get_bits.h"

33 #include "ivi_dsp.h"

34 #include "ivi_common.h"

35 #include "indeo4data.h"

37 /**

38 * Indeo 4 frame types.

39 */

40 enum {

41 FRAMETYPE_INTRA = 0,

42 FRAMETYPE_INTRA1 = 1, ///< intra frame with slightly different bitstream coding

43 FRAMETYPE_INTER = 2, ///< non-droppable P-frame

44 FRAMETYPE_BIDIR = 3, ///< bidirectional frame

45 FRAMETYPE_INTER_NOREF = 4, ///< droppable P-frame

46 FRAMETYPE_NULL_FIRST = 5, ///< empty frame with no data

47 FRAMETYPE_NULL_LAST = 6 ///< empty frame with no data

48 };

50 #define IVI4_PIC_SIZE_ESC 7

53 static const struct {

54 InvTransformPtr *inv_trans;

55 DCTransformPtr *dc_trans;

56 int is_2d_trans;

57 } transforms[18] = {

58 { ff_ivi_inverse_haar_8x8, ff_ivi_dc_haar_2d, 1 },

59 { ff_ivi_row_haar8, ff_ivi_dc_haar_2d, 0 },

60 { ff_ivi_col_haar8, ff_ivi_dc_haar_2d, 0 },

61 { ff_ivi_put_pixels_8x8, ff_ivi_put_dc_pixel_8x8, 1 },

62 { ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d, 1 },

63 { ff_ivi_row_slant8, ff_ivi_dc_row_slant, 1 },

64 { ff_ivi_col_slant8, ff_ivi_dc_col_slant, 1 },

65 { NULL, NULL, 0 }, /* inverse DCT 8x8 */

66 { NULL, NULL, 0 }, /* inverse DCT 8x1 */

67 { NULL, NULL, 0 }, /* inverse DCT 1x8 */

68 { ff_ivi_inverse_haar_4x4, ff_ivi_dc_haar_2d, 1 },

69 { ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d, 1 },

70 { NULL, NULL, 0 }, /* no transform 4x4 */

71 { ff_ivi_row_haar4, ff_ivi_dc_haar_2d, 0 },

72 { ff_ivi_col_haar4, ff_ivi_dc_haar_2d, 0 },

73 { ff_ivi_row_slant4, ff_ivi_dc_row_slant, 0 },

74 { ff_ivi_col_slant4, ff_ivi_dc_col_slant, 0 },

75 { NULL, NULL, 0 }, /* inverse DCT 4x4 */

76 };

78 /**

79 * Decode subdivision of a plane.

80 * This is a simplified version that checks for two supported subdivisions:

81 * - 1 wavelet band per plane, size factor 1:1, code pattern: 3

82 * - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3

83 * Anything else is either unsupported or corrupt.

84 *

85 * @param[in,out] gb the GetBit context

86 * @return number of wavelet bands or 0 on error

87 */

88 static int decode_plane_subdivision(GetBitContext *gb)

89 {

90 int i;

92 switch (get_bits(gb, 2)) {

93 case 3:

94 return 1;

95 case 2:

96 for (i = 0; i < 4; i++)

97 if (get_bits(gb, 2) != 3)

98 return 0;

99 return 4;

100 default:

101 return 0;

102 }

103 }

104

105 static inline int scale_tile_size(int def_size, int size_factor)

106 {

107 return size_factor == 15 ? def_size : (size_factor + 1) << 5;

108 }

109

110 /**

111 * Decode Indeo 4 picture header.

112 *

113 * @param[in,out] ctx pointer to the decoder context

114 * @param[in] avctx pointer to the AVCodecContext

115 * @return result code: 0 = OK, negative number = error

116 */

117 static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)

118 {

119 int pic_size_indx, i, p;

120 IVIPicConfig pic_conf;

121

122 if (get_bits(&ctx->gb, 18) != 0x3FFF8) {

123 av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");

124 return AVERROR_INVALIDDATA;

125 }

126

127 ctx->prev_frame_type = ctx->frame_type;

128 ctx->frame_type = get_bits(&ctx->gb, 3);

129 if (ctx->frame_type == 7) {

130 av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d\n", ctx->frame_type);

131 return AVERROR_INVALIDDATA;

132 }

133

134 #if IVI4_STREAM_ANALYSER

135 if (ctx->frame_type == FRAMETYPE_BIDIR)

136 ctx->has_b_frames = 1;

137 #endif

138

139 ctx->transp_status = get_bits1(&ctx->gb);

140 #if IVI4_STREAM_ANALYSER

141 if (ctx->transp_status) {

142 ctx->has_transp = 1;

143 }

144 #endif

145

146 /* unknown bit: Mac decoder ignores this bit, XANIM returns error */

147 if (get_bits1(&ctx->gb)) {

148 av_log(avctx, AV_LOG_ERROR, "Sync bit is set!\n");

149 return AVERROR_INVALIDDATA;

150 }

151

152 ctx->data_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 24) : 0;

153

154 /* null frames don't contain anything else so we just return */

155 if (ctx->frame_type >= FRAMETYPE_NULL_FIRST) {

156 av_dlog(avctx, "Null frame encountered!\n");

157 return 0;

158 }

159

160 /* Check key lock status. If enabled - ignore lock word. */

161 /* Usually we have to prompt the user for the password, but */

162 /* we don't do that because Indeo 4 videos can be decoded anyway */

163 if (get_bits1(&ctx->gb)) {

164 skip_bits_long(&ctx->gb, 32);

165 av_dlog(avctx, "Password-protected clip!\n");

166 }

167

168 pic_size_indx = get_bits(&ctx->gb, 3);

169 if (pic_size_indx == IVI4_PIC_SIZE_ESC) {

170 pic_conf.pic_height = get_bits(&ctx->gb, 16);

171 pic_conf.pic_width = get_bits(&ctx->gb, 16);

172 } else {

173 pic_conf.pic_height = ivi4_common_pic_sizes[pic_size_indx * 2 + 1];

174 pic_conf.pic_width = ivi4_common_pic_sizes[pic_size_indx * 2 ];

175 }

176

177 /* Decode tile dimensions. */

178 if (get_bits1(&ctx->gb)) {

179 pic_conf.tile_height = scale_tile_size(pic_conf.pic_height, get_bits(&ctx->gb, 4));

180 pic_conf.tile_width = scale_tile_size(pic_conf.pic_width, get_bits(&ctx->gb, 4));

181 #if IVI4_STREAM_ANALYSER

182 ctx->uses_tiling = 1;

183 #endif

184 } else {

185 pic_conf.tile_height = pic_conf.pic_height;

186 pic_conf.tile_width = pic_conf.pic_width;

187 }

188

189 /* Decode chroma subsampling. We support only 4:4 aka YVU9. */

190 if (get_bits(&ctx->gb, 2)) {

191 av_log(avctx, AV_LOG_ERROR, "Only YVU9 picture format is supported!\n");

192 return AVERROR_INVALIDDATA;

193 }

194 pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;

195 pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2;

196

197 /* decode subdivision of the planes */

198 pic_conf.luma_bands = decode_plane_subdivision(&ctx->gb);

199 pic_conf.chroma_bands = 0;

200 if (pic_conf.luma_bands)

201 pic_conf.chroma_bands = decode_plane_subdivision(&ctx->gb);

202 ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;

203 if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {

204 av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",

205 pic_conf.luma_bands, pic_conf.chroma_bands);

206 return AVERROR_INVALIDDATA;

207 }

208

209 /* check if picture layout was changed and reallocate buffers */

210 if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {

211 if (ff_ivi_init_planes(ctx->planes, &pic_conf)) {

212 av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");

213 return AVERROR(ENOMEM);

214 }

215

216 ctx->pic_conf = pic_conf;

217

218 /* set default macroblock/block dimensions */

219 for (p = 0; p <= 2; p++) {

220 for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {

221 ctx->planes[p].bands[i].mb_size = !p ? (!ctx->is_scalable ? 16 : 8) : 4;

222 ctx->planes[p].bands[i].blk_size = !p ? 8 : 4;

223 }

224 }

225

226 if (ff_ivi_init_tiles(ctx->planes, ctx->pic_conf.tile_width,

227 ctx->pic_conf.tile_height)) {

228 av_log(avctx, AV_LOG_ERROR,

229 "Couldn't reallocate internal structures!\n");

230 return AVERROR(ENOMEM);

231 }

232 }

233

234 ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0;

235

236 /* skip decTimeEst field if present */

237 if (get_bits1(&ctx->gb))

238 skip_bits(&ctx->gb, 8);

239

240 /* decode macroblock and block huffman codebooks */

241 if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF, &ctx->mb_vlc, avctx) ||

242 ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx))

243 return AVERROR_INVALIDDATA;

244

245 ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;

246

247 ctx->in_imf = get_bits1(&ctx->gb);

248 ctx->in_q = get_bits1(&ctx->gb);

249

250 ctx->pic_glob_quant = get_bits(&ctx->gb, 5);

251

252 /* TODO: ignore this parameter if unused */

253 ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0;

254

255 ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0;

256

257 /* skip picture header extension if any */

258 while (get_bits1(&ctx->gb)) {

259 av_dlog(avctx, "Pic hdr extension encountered!\n");

260 skip_bits(&ctx->gb, 8);

261 }

262

263 if (get_bits1(&ctx->gb)) {

264 av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n");

265 }

266

267 align_get_bits(&ctx->gb);

268

269 return 0;

270 }

271

272

273 /**

274 * Decode Indeo 4 band header.

275 *

276 * @param[in,out] ctx pointer to the decoder context

277 * @param[in,out] band pointer to the band descriptor

278 * @param[in] avctx pointer to the AVCodecContext

279 * @return result code: 0 = OK, negative number = error

280 */

281 static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,

282 AVCodecContext *avctx)

283 {

284 int plane, band_num, indx, transform_id, scan_indx;

285 int i;

286 int quant_mat;

287

288 plane = get_bits(&ctx->gb, 2);

289 band_num = get_bits(&ctx->gb, 4);

290 if (band->plane != plane || band->band_num != band_num) {

291 av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n");

292 return AVERROR_INVALIDDATA;

293 }

294

295 band->is_empty = get_bits1(&ctx->gb);

296 if (!band->is_empty) {

297 /* skip header size

298 * If header size is not given, header size is 4 bytes. */

299 if (get_bits1(&ctx->gb))

300 skip_bits(&ctx->gb, 16);

301

302 band->is_halfpel = get_bits(&ctx->gb, 2);

303 if (band->is_halfpel >= 2) {

304 av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n",

305 band->is_halfpel);

306 return AVERROR_INVALIDDATA;

307 }

308 #if IVI4_STREAM_ANALYSER

309 if (!band->is_halfpel)

310 ctx->uses_fullpel = 1;

311 #endif

312

313 band->checksum_present = get_bits1(&ctx->gb);

314 if (band->checksum_present)

315 band->checksum = get_bits(&ctx->gb, 16);

316

317 indx = get_bits(&ctx->gb, 2);

318 if (indx == 3) {

319 av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n");

320 return AVERROR_INVALIDDATA;

321 }

322 band->mb_size = 16 >> indx;

323 band->blk_size = 8 >> (indx >> 1);

324

325 band->inherit_mv = get_bits1(&ctx->gb);

326 band->inherit_qdelta = get_bits1(&ctx->gb);

327

328 band->glob_quant = get_bits(&ctx->gb, 5);

329

330 if (!get_bits1(&ctx->gb) || ctx->frame_type == FRAMETYPE_INTRA) {

331 transform_id = get_bits(&ctx->gb, 5);

332 if (transform_id >= FF_ARRAY_ELEMS(transforms) ||

333 !transforms[transform_id].inv_trans) {

334 avpriv_request_sample(avctx, "Transform %d", transform_id);

335 return AVERROR_PATCHWELCOME;

336 }

337 if ((transform_id >= 7 && transform_id <= 9) ||

338 transform_id == 17) {

339 avpriv_request_sample(avctx, "DCT transform");

340 return AVERROR_PATCHWELCOME;

341 }

342

343 if (transform_id < 10 && band->blk_size < 8) {

344 av_log(avctx, AV_LOG_ERROR, "wrong transform size!\n");

345 return AVERROR_INVALIDDATA;

346 }

347 #if IVI4_STREAM_ANALYSER

348 if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10)

349 ctx->uses_haar = 1;

350 #endif

351

352 band->inv_transform = transforms[transform_id].inv_trans;

353 band->dc_transform = transforms[transform_id].dc_trans;

354 band->is_2d_trans = transforms[transform_id].is_2d_trans;

355 band->transform_size= (transform_id < 10) ? 8 : 4;

356

357 scan_indx = get_bits(&ctx->gb, 4);

358 if ((scan_indx>4 && scan_indx<10) != (band->blk_size==4)) {

359 av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");

360 return AVERROR_INVALIDDATA;

361 }

362 if (scan_indx == 15) {

363 av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");

364 return AVERROR_INVALIDDATA;

365 }

366 band->scan = scan_index_to_tab[scan_indx];

367 band->scan_size = band->blk_size;

368

369 quant_mat = get_bits(&ctx->gb, 5);

370 if (quant_mat == 31) {

371 av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n");

372 return AVERROR_INVALIDDATA;

373 }

374 if (quant_mat > 21) {

375 av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix encountered!\n");

376 return AVERROR_INVALIDDATA;

377 }

378 band->quant_mat = quant_mat;

379 }

380 if (quant_index_to_tab[band->quant_mat] > 4 && band->blk_size == 4) {

381 av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix for 4x4 block encountered!\n");

382 band->quant_mat = 0;

383 return AVERROR_INVALIDDATA;

384 }

385 if (band->scan_size != band->blk_size) {

386 av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");

387 return AVERROR_INVALIDDATA;

388 }

389 if (band->transform_size == 8 && band->blk_size < 8) {

390 av_log(avctx, AV_LOG_ERROR, "mismatching transform_size!\n");

391 return AVERROR_INVALIDDATA;

392 }

393

394 /* decode block huffman codebook */

395 if (!get_bits1(&ctx->gb))

396 band->blk_vlc.tab = ctx->blk_vlc.tab;

397 else

398 if (ff_ivi_dec_huff_desc(&ctx->gb, 1, IVI_BLK_HUFF,

399 &band->blk_vlc, avctx))

400 return AVERROR_INVALIDDATA;

401

402 /* select appropriate rvmap table for this band */

403 band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;

404

405 /* decode rvmap probability corrections if any */

406 band->num_corr = 0; /* there is no corrections */

407 if (get_bits1(&ctx->gb)) {

408 band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */

409 if (band->num_corr > 61) {

410 av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",

411 band->num_corr);

412 return AVERROR_INVALIDDATA;

413 }

414

415 /* read correction pairs */

416 for (i = 0; i < band->num_corr * 2; i++)

417 band->corr[i] = get_bits(&ctx->gb, 8);

418 }

419 }

420

421 if (band->blk_size == 8) {

422 band->intra_base = &ivi4_quant_8x8_intra[quant_index_to_tab[band->quant_mat]][0];

423 band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];

424 } else {

425 band->intra_base = &ivi4_quant_4x4_intra[quant_index_to_tab[band->quant_mat]][0];

426 band->inter_base = &ivi4_quant_4x4_inter[quant_index_to_tab[band->quant_mat]][0];

427 }

428

429 /* Indeo 4 doesn't use scale tables */

430 band->intra_scale = NULL;

431 band->inter_scale = NULL;

432

433 align_get_bits(&ctx->gb);

434

435 if (!band->scan) {

436 av_log(avctx, AV_LOG_ERROR, "band->scan not set\n");

437 return AVERROR_INVALIDDATA;

438 }

439

440 return 0;

441 }

442

443

444 /**

445 * Decode information (block type, cbp, quant delta, motion vector)

446 * for all macroblocks in the current tile.

447 *

448 * @param[in,out] ctx pointer to the decoder context

449 * @param[in,out] band pointer to the band descriptor

450 * @param[in,out] tile pointer to the tile descriptor

451 * @param[in] avctx pointer to the AVCodecContext

452 * @return result code: 0 = OK, negative number = error

453 */

454 static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,

455 IVITile *tile, AVCodecContext *avctx)

456 {

457 int x, y, mv_x, mv_y, mv_delta, offs, mb_offset, blks_per_mb,

458 mv_scale, mb_type_bits, s;

459 IVIMbInfo *mb, *ref_mb;

460 int row_offset = band->mb_size * band->pitch;

461

462 mb = tile->mbs;

463 ref_mb = tile->ref_mbs;

464 offs = tile->ypos * band->pitch + tile->xpos;

465

466 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;

467 mb_type_bits = ctx->frame_type == FRAMETYPE_BIDIR ? 2 : 1;

468

469 /* scale factor for motion vectors */

470 mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);

471 mv_x = mv_y = 0;

472

473 if (((tile->width + band->mb_size-1)/band->mb_size) * ((tile->height + band->mb_size-1)/band->mb_size) != tile->num_MBs) {

474 av_log(avctx, AV_LOG_ERROR, "num_MBs mismatch %d %d %d %d\n", tile->width, tile->height, band->mb_size, tile->num_MBs);

475 return -1;

476 }

477

478 for (y = tile->ypos; y < tile->ypos + tile->height; y += band->mb_size) {

479 mb_offset = offs;

480

481 for (x = tile->xpos; x < tile->xpos + tile->width; x += band->mb_size) {

482 mb->xpos = x;

483 mb->ypos = y;

484 mb->buf_offs = mb_offset;

485

486 if (get_bits1(&ctx->gb)) {

487 if (ctx->frame_type == FRAMETYPE_INTRA) {

488 av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");

489 return AVERROR_INVALIDDATA;

490 }

491 mb->type = 1; /* empty macroblocks are always INTER */

492 mb->cbp = 0; /* all blocks are empty */

493

494 mb->q_delta = 0;

495 if (!band->plane && !band->band_num && ctx->in_q) {

496 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,

497 IVI_VLC_BITS, 1);

498 mb->q_delta = IVI_TOSIGNED(mb->q_delta);

499 }

500

501 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */

502 if (band->inherit_mv && ref_mb) {

503 /* motion vector inheritance */

504 if (mv_scale) {

505 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);

506 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);

507 } else {

508 mb->mv_x = ref_mb->mv_x;

509 mb->mv_y = ref_mb->mv_y;

510 }

511 }

512 } else {

513 if (band->inherit_mv && ref_mb) {

514 mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */

515 } else if (ctx->frame_type == FRAMETYPE_INTRA ||

516 ctx->frame_type == FRAMETYPE_INTRA1) {

517 mb->type = 0; /* mb_type is always INTRA for intra-frames */

518 } else {

519 mb->type = get_bits(&ctx->gb, mb_type_bits);

520 }

521

522 mb->cbp = get_bits(&ctx->gb, blks_per_mb);

523

524 mb->q_delta = 0;

525 if (band->inherit_qdelta) {

526 if (ref_mb) mb->q_delta = ref_mb->q_delta;

527 } else if (mb->cbp || (!band->plane && !band->band_num &&

528 ctx->in_q)) {

529 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,

530 IVI_VLC_BITS, 1);

531 mb->q_delta = IVI_TOSIGNED(mb->q_delta);

532 }

533

534 if (!mb->type) {

535 mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */

536 } else {

537 if (band->inherit_mv && ref_mb) {

538 /* motion vector inheritance */

539 if (mv_scale) {

540 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);

541 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);

542 } else {

543 mb->mv_x = ref_mb->mv_x;

544 mb->mv_y = ref_mb->mv_y;

545 }

546 } else {

547 /* decode motion vector deltas */

548 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,

549 IVI_VLC_BITS, 1);

550 mv_y += IVI_TOSIGNED(mv_delta);

551 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,

552 IVI_VLC_BITS, 1);

553 mv_x += IVI_TOSIGNED(mv_delta);

554 mb->mv_x = mv_x;

555 mb->mv_y = mv_y;

556 }

557 }

558 }

559

560 s= band->is_halfpel;

561 if (mb->type)

562 if ( x + (mb->mv_x >>s) + (y+ (mb->mv_y >>s))*band->pitch < 0 ||

563 x + ((mb->mv_x+s)>>s) + band->mb_size - 1

564 + (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize -1) {

565 av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);

566 return AVERROR_INVALIDDATA;

567 }

568

569 mb++;

570 if (ref_mb)

571 ref_mb++;

572 mb_offset += band->mb_size;

573 }

574

575 offs += row_offset;

576 }

577

578 align_get_bits(&ctx->gb);

579

580 return 0;

581 }

582

583

584 /**

585 * Rearrange decoding and reference buffers.

586 *

587 * @param[in,out] ctx pointer to the decoder context

588 */

589 static void switch_buffers(IVI45DecContext *ctx)

590 {

591 switch (ctx->prev_frame_type) {

592 case FRAMETYPE_INTRA:

593 case FRAMETYPE_INTRA1:

594 case FRAMETYPE_INTER:

595 ctx->buf_switch ^= 1;

596 ctx->dst_buf = ctx->buf_switch;

597 ctx->ref_buf = ctx->buf_switch ^ 1;

598 break;

599 case FRAMETYPE_INTER_NOREF:

600 break;

601 }

602

603 switch (ctx->frame_type) {

604 case FRAMETYPE_INTRA:

605 case FRAMETYPE_INTRA1:

606 ctx->buf_switch = 0;

607 /* FALLTHROUGH */

608 case FRAMETYPE_INTER:

609 ctx->dst_buf = ctx->buf_switch;

610 ctx->ref_buf = ctx->buf_switch ^ 1;

611 break;

612 case FRAMETYPE_INTER_NOREF:

613 case FRAMETYPE_NULL_FIRST:

614 case FRAMETYPE_NULL_LAST:

615 break;

616 }

617 }

618

619

620 static int is_nonnull_frame(IVI45DecContext *ctx)

621 {

622 return ctx->frame_type < FRAMETYPE_NULL_FIRST;

623 }

624

625

626 static av_cold int decode_init(AVCodecContext *avctx)

627 {

628 IVI45DecContext *ctx = avctx->priv_data;

629

630 ff_ivi_init_static_vlc();

631

632 /* copy rvmap tables in our context so we can apply changes to them */

633 memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));

634

635 /* Force allocation of the internal buffers */

636 /* during picture header decoding. */

637 ctx->pic_conf.pic_width = 0;

638 ctx->pic_conf.pic_height = 0;

639

640 avctx->pix_fmt = AV_PIX_FMT_YUV410P;

641

642 ctx->decode_pic_hdr = decode_pic_hdr;

643 ctx->decode_band_hdr = decode_band_hdr;

644 ctx->decode_mb_info = decode_mb_info;

645 ctx->switch_buffers = switch_buffers;

646 ctx->is_nonnull_frame = is_nonnull_frame;

647

648 return 0;

649 }

650

651

652 AVCodec ff_indeo4_decoder = {

653 .name = "indeo4",

654 .type = AVMEDIA_TYPE_VIDEO,

655 .id = AV_CODEC_ID_INDEO4,

656 .priv_data_size = sizeof(IVI45DecContext),

657 .init = decode_init,

658 .close = ff_ivi_decode_close,

659 .decode = ff_ivi_decode_frame,

660 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),

661 .capabilities = CODEC_CAP_DR1,

662 };

Generated on Wed Jul 10 2013 23:47:59 for FFmpeg by doxygen 1.8.2