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 "dsputil.h"

34 #include "ivi_dsp.h"

35 #include "ivi_common.h"

36 #include "indeo4data.h"

38 /**

39 * Indeo 4 frame types.

40 */

41 enum {

42 FRAMETYPE_INTRA = 0,

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

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

45 FRAMETYPE_BIDIR = 3, ///< bidirectional frame

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

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

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

49 };

51 #define IVI4_PIC_SIZE_ESC 7

54 static const struct {

55 InvTransformPtr *inv_trans;

56 DCTransformPtr *dc_trans;

57 int is_2d_trans;

58 } transforms[18] = {

59 { ff_ivi_inverse_haar_8x8, ff_ivi_dc_haar_2d, 1 },

60 { NULL, NULL, 0 }, /* inverse Haar 8x1 */

61 { NULL, NULL, 0 }, /* inverse Haar 1x8 */

62 { ff_ivi_put_pixels_8x8, ff_ivi_put_dc_pixel_8x8, 1 },

63 { ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d, 1 },

64 { ff_ivi_row_slant8, ff_ivi_dc_row_slant, 1 },

65 { ff_ivi_col_slant8, ff_ivi_dc_col_slant, 1 },

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

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

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

69 { NULL, NULL, 0 }, /* inverse Haar 4x4 */

70 { ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d, 1 },

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

72 { NULL, NULL, 0 }, /* inverse Haar 1x4 */

73 { NULL, NULL, 0 }, /* inverse Haar 4x1 */

74 { NULL, NULL, 0 }, /* inverse slant 1x4 */

75 { NULL, NULL, 0 }, /* inverse slant 4x1 */

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

77 };

79 /**

80 * Decode subdivision of a plane.

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

82 * - 1 wavelet band per plane, size factor 1:1, code pattern: 3

83 * - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3

84 * Anything else is either unsupported or corrupt.

85 *

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

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

88 */

89 static int decode_plane_subdivision(GetBitContext *gb)

90 {

91 int i;

93 switch (get_bits(gb, 2)) {

94 case 3:

95 return 1;

96 case 2:

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

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

99 return 0;

100 return 4;

101 default:

102 return 0;

103 }

104 }

105

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

107 {

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

109 }

110

111 /**

112 * Decode Indeo 4 picture header.

113 *

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

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

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

117 */

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

119 {

120 int pic_size_indx, i, p;

121 IVIPicConfig pic_conf;

122

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

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

125 return AVERROR_INVALIDDATA;

126 }

127

128 ctx->prev_frame_type = ctx->frame_type;

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

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

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

132 return AVERROR_INVALIDDATA;

133 }

134

135 #if IVI4_STREAM_ANALYSER

136 if (ctx->frame_type == FRAMETYPE_BIDIR)

137 ctx->has_b_frames = 1;

138 #endif

139

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

141 #if IVI4_STREAM_ANALYSER

142 if (ctx->transp_status) {

143 ctx->has_transp = 1;

144 }

145 #endif

146

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

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

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

150 return AVERROR_INVALIDDATA;

151 }

152

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

154

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

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

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

158 return 0;

159 }

160

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

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

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

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

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

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

167 }

168

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

170 if (pic_size_indx == IVI4_PIC_SIZE_ESC) {

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

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

173 } else {

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

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

176 }

177

178 /* Decode tile dimensions. */

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

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

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

182 #if IVI4_STREAM_ANALYSER

183 ctx->uses_tiling = 1;

184 #endif

185 } else {

186 pic_conf.tile_height = pic_conf.pic_height;

187 pic_conf.tile_width = pic_conf.pic_width;

188 }

189

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

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

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

193 return AVERROR_INVALIDDATA;

194 }

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

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

197

198 /* decode subdivision of the planes */

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

200 pic_conf.chroma_bands = 0;

201 if (pic_conf.luma_bands)

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

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

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

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

206 pic_conf.luma_bands, pic_conf.chroma_bands);

207 return AVERROR_INVALIDDATA;

208 }

209

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

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

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

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

214 return AVERROR(ENOMEM);

215 }

216

217 ctx->pic_conf = pic_conf;

218

219 /* set default macroblock/block dimensions */

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

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

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

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

224 }

225 }

226

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

228 ctx->pic_conf.tile_height)) {

229 av_log(avctx, AV_LOG_ERROR,

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

231 return AVERROR(ENOMEM);

232 }

233 }

234

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

236

237 /* skip decTimeEst field if present */

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

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

240

241 /* decode macroblock and block huffman codebooks */

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

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

244 return AVERROR_INVALIDDATA;

245

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

247

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

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

250

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

252

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

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

255

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

257

258 /* skip picture header extension if any */

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

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

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

262 }

263

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

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

266 }

267

268 align_get_bits(&ctx->gb);

269

270 return 0;

271 }

272

273

274 /**

275 * Decode Indeo 4 band header.

276 *

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

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

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

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

281 */

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

283 AVCodecContext *avctx)

284 {

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

286 int i;

287 int quant_mat;

288

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

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

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

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

293 return AVERROR_INVALIDDATA;

294 }

295

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

297 if (!band->is_empty) {

298 /* skip header size

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

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

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

302

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

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

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

306 band->is_halfpel);

307 return AVERROR_INVALIDDATA;

308 }

309 #if IVI4_STREAM_ANALYSER

310 if (!band->is_halfpel)

311 ctx->uses_fullpel = 1;

312 #endif

313

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

315 if (band->checksum_present)

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

317

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

319 if (indx == 3) {

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

321 return AVERROR_INVALIDDATA;

322 }

323 band->mb_size = 16 >> indx;

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

325

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

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

328

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

330

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

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

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

334 !transforms[transform_id].inv_trans) {

335 av_log_ask_for_sample(avctx, "Unimplemented transform: %d!\n", transform_id);

336 return AVERROR_PATCHWELCOME;

337 }

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

339 transform_id == 17) {

340 av_log_ask_for_sample(avctx, "DCT transform not supported yet!\n");

341 return AVERROR_PATCHWELCOME;

342 }

343

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

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

346 return AVERROR_INVALIDDATA;

347 }

348 #if IVI4_STREAM_ANALYSER

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

350 ctx->uses_haar = 1;

351 #endif

352

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

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

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

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

357

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

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

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

361 return AVERROR_INVALIDDATA;

362 }

363 if (scan_indx == 15) {

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

365 return AVERROR_INVALIDDATA;

366 }

367 band->scan = scan_index_to_tab[scan_indx];

368 band->scan_size = band->blk_size;

369

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

371 if (quant_mat == 31) {

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

373 return AVERROR_INVALIDDATA;

374 }

375 if (quant_mat > 21) {

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

377 return AVERROR_INVALIDDATA;

378 }

379 band->quant_mat = quant_mat;

380 }

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

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

383 band->quant_mat = 0;

384 return AVERROR_INVALIDDATA;

385 }

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

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

388 return AVERROR_INVALIDDATA;

389 }

390

391 /* decode block huffman codebook */

392 if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF,

393 &band->blk_vlc, avctx))

394 return AVERROR_INVALIDDATA;

395

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

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

398

399 /* decode rvmap probability corrections if any */

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

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

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

403 if (band->num_corr > 61) {

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

405 band->num_corr);

406 return AVERROR_INVALIDDATA;

407 }

408

409 /* read correction pairs */

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

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

412 }

413 }

414

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

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

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

418 } else {

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

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

421 }

422

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

424 band->intra_scale = NULL;

425 band->inter_scale = NULL;

426

427 align_get_bits(&ctx->gb);

428

429 if (!band->scan) {

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

431 return AVERROR_INVALIDDATA;

432 }

433

434 return 0;

435 }

436

437

438 /**

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

440 * for all macroblocks in the current tile.

441 *

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

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

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

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

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

447 */

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

449 IVITile *tile, AVCodecContext *avctx)

450 {

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

452 mv_scale, mb_type_bits, s;

453 IVIMbInfo *mb, *ref_mb;

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

455

456 mb = tile->mbs;

457 ref_mb = tile->ref_mbs;

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

459

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

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

462

463 /* scale factor for motion vectors */

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

465 mv_x = mv_y = 0;

466

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

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

469 return -1;

470 }

471

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

473 mb_offset = offs;

474

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

476 mb->xpos = x;

477 mb->ypos = y;

478 mb->buf_offs = mb_offset;

479

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

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

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

483 return AVERROR_INVALIDDATA;

484 }

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

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

487

488 mb->q_delta = 0;

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

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

491 IVI_VLC_BITS, 1);

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

493 }

494

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

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

497 /* motion vector inheritance */

498 if (mv_scale) {

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

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

501 } else {

502 mb->mv_x = ref_mb->mv_x;

503 mb->mv_y = ref_mb->mv_y;

504 }

505 }

506 } else {

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

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

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

510 ctx->frame_type == FRAMETYPE_INTRA1) {

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

512 } else {

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

514 }

515

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

517

518 mb->q_delta = 0;

519 if (band->inherit_qdelta) {

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

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

522 ctx->in_q)) {

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

524 IVI_VLC_BITS, 1);

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

526 }

527

528 if (!mb->type) {

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

530 } else {

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

532 /* motion vector inheritance */

533 if (mv_scale) {

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

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

536 } else {

537 mb->mv_x = ref_mb->mv_x;

538 mb->mv_y = ref_mb->mv_y;

539 }

540 } else {

541 /* decode motion vector deltas */

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

543 IVI_VLC_BITS, 1);

544 mv_y += IVI_TOSIGNED(mv_delta);

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

546 IVI_VLC_BITS, 1);

547 mv_x += IVI_TOSIGNED(mv_delta);

548 mb->mv_x = mv_x;

549 mb->mv_y = mv_y;

550 }

551 }

552 }

553

554 s= band->is_halfpel;

555 if (mb->type)

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

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

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

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

560 return AVERROR_INVALIDDATA;

561 }

562

563 mb++;

564 if (ref_mb)

565 ref_mb++;

566 mb_offset += band->mb_size;

567 }

568

569 offs += row_offset;

570 }

571

572 align_get_bits(&ctx->gb);

573

574 return 0;

575 }

576

577

578 /**

579 * Rearrange decoding and reference buffers.

580 *

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

582 */

583 static void switch_buffers(IVI45DecContext *ctx)

584 {

585 switch (ctx->prev_frame_type) {

586 case FRAMETYPE_INTRA:

587 case FRAMETYPE_INTRA1:

588 case FRAMETYPE_INTER:

589 ctx->buf_switch ^= 1;

590 ctx->dst_buf = ctx->buf_switch;

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

592 break;

593 case FRAMETYPE_INTER_NOREF:

594 break;

595 }

596

597 switch (ctx->frame_type) {

598 case FRAMETYPE_INTRA:

599 case FRAMETYPE_INTRA1:

600 ctx->buf_switch = 0;

601 /* FALLTHROUGH */

602 case FRAMETYPE_INTER:

603 ctx->dst_buf = ctx->buf_switch;

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

605 break;

606 case FRAMETYPE_INTER_NOREF:

607 case FRAMETYPE_NULL_FIRST:

608 case FRAMETYPE_NULL_LAST:

609 break;

610 }

611 }

612

613

614 static int is_nonnull_frame(IVI45DecContext *ctx)

615 {

616 return ctx->frame_type < FRAMETYPE_NULL_FIRST;

617 }

618

619

620 static av_cold int decode_init(AVCodecContext *avctx)

621 {

622 IVI45DecContext *ctx = avctx->priv_data;

623

624 ff_ivi_init_static_vlc();

625

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

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

628

629 /* Force allocation of the internal buffers */

630 /* during picture header decoding. */

631 ctx->pic_conf.pic_width = 0;

632 ctx->pic_conf.pic_height = 0;

633

634 avctx->pix_fmt = AV_PIX_FMT_YUV410P;

635

636 ctx->decode_pic_hdr = decode_pic_hdr;

637 ctx->decode_band_hdr = decode_band_hdr;

638 ctx->decode_mb_info = decode_mb_info;

639 ctx->switch_buffers = switch_buffers;

640 ctx->is_nonnull_frame = is_nonnull_frame;

641

642 return 0;

643 }

644

645

646 AVCodec ff_indeo4_decoder = {

647 .name = "indeo4",

648 .type = AVMEDIA_TYPE_VIDEO,

649 .id = AV_CODEC_ID_INDEO4,

650 .priv_data_size = sizeof(IVI45DecContext),

651 .init = decode_init,

652 .close = ff_ivi_decode_close,

653 .decode = ff_ivi_decode_frame,

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

655 .capabilities = CODEC_CAP_DR1,

656 };

Generated on Sat May 25 2013 03:58:35 for FFmpeg by doxygen 1.8.2