FFmpeg: libavcodec/rv10.c Source File

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rv10.c

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1 /*

2 * RV10/RV20 decoder

5 *

6 * This file is part of FFmpeg.

7 *

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

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

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

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

12 *

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

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

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

16 * Lesser General Public License for more details.

17 *

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

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

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

21 */

23 /**

24 * @file

25 * RV10/RV20 decoder

26 */

28 #include <inttypes.h>

30 #include "libavutil/imgutils.h"

31 #include "libavutil/thread.h"

33 #include "avcodec.h"

34 #include "codec_internal.h"

35 #include "decode.h"

36 #include "error_resilience.h"

37 #include "h263.h"

38 #include "h263data.h"

39 #include "h263dec.h"

40 #include "mpeg_er.h"

41 #include "mpegutils.h"

42 #include "mpegvideo.h"

43 #include "mpegvideodec.h"

44 #include "mpeg4video.h"

45 #include "mpegvideodata.h"

46 #include "rv10dec.h"

48 #define RV_GET_MAJOR_VER(x) ((x) >> 28)

49 #define RV_GET_MINOR_VER(x) (((x) >> 20) & 0xFF)

50 #define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF)

52 #define MAX_VLC_ENTRIES 1023 // Note: Does not include the skip entries.

53 #define DC_VLC_BITS 9

55 typedef struct RVDecContext {

56 MpegEncContext m;

57 int sub_id;

58 int orig_width, orig_height;

59 } RVDecContext;

61 /* (run, length) encoded value for the symbols table. The actual symbols

62 * are run..run - length (mod 256).

63 * The last two entries in the following table apply to luma only.

64 * The skip values are not included in this list. */

65 static const uint8_t rv_sym_run_len[][2] = {

66 { 0, 0 }, { 1, 0 }, { 255, 0 }, { 3, 1 }, { 254, 1 },

67 { 7, 3 }, { 252, 3 }, { 15, 7 }, { 248, 7 }, { 31, 15 },

68 { 240, 15 }, { 63, 31 }, { 224, 31 }, { 127, 63 }, { 192, 63 },

69 { 255, 127 }, { 128, 127 }, { 127, 255 }, { 128, 255 },

70 };

72 /* entry[i] of the following tables gives

73 * the number of VLC codes of length i + 2. */

74 static const uint16_t rv_lum_len_count[15] = {

75 1, 0, 2, 4, 8, 16, 32, 0, 64, 0, 128, 0, 256, 0, 512,

76 };

78 static const uint16_t rv_chrom_len_count[15] = {

79 1, 2, 4, 0, 8, 0, 16, 0, 32, 0, 64, 0, 128, 0, 256,

80 };

82 static VLC rv_dc_lum, rv_dc_chrom;

84 int ff_rv_decode_dc(MpegEncContext *s, int n)

85 {

86 int code;

88 if (n < 4) {

89 code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2);

90 } else {

91 code = get_vlc2(&s->gb, rv_dc_chrom.table, DC_VLC_BITS, 2);

92 if (code < 0) {

93 av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");

94 return -1;

95 }

96 }

97 return code;

98 }

100 /* read RV 1.0 compatible frame header */

101 static int rv10_decode_picture_header(MpegEncContext *s)

102 {

103 int mb_count, pb_frame, marker, mb_xy;

104

105 marker = get_bits1(&s->gb);

106

107 if (get_bits1(&s->gb))

108 s->pict_type = AV_PICTURE_TYPE_P;

109 else

110 s->pict_type = AV_PICTURE_TYPE_I;

111

112 if (!marker)

113 av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");

114

115 pb_frame = get_bits1(&s->gb);

116

117 ff_dlog(s->avctx, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);

118

119 if (pb_frame) {

120 avpriv_request_sample(s->avctx, "PB-frame");

121 return AVERROR_PATCHWELCOME;

122 }

123

124 s->qscale = get_bits(&s->gb, 5);

125 if (s->qscale == 0) {

126 av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");

127 return AVERROR_INVALIDDATA;

128 }

129

130 if (s->pict_type == AV_PICTURE_TYPE_I) {

131 if (s->rv10_version == 3) {

132 /* specific MPEG like DC coding not used */

133 s->last_dc[0] = get_bits(&s->gb, 8);

134 s->last_dc[1] = get_bits(&s->gb, 8);

135 s->last_dc[2] = get_bits(&s->gb, 8);

136 ff_dlog(s->avctx, "DC:%d %d %d\n", s->last_dc[0],

137 s->last_dc[1], s->last_dc[2]);

138 }

139 }

140 /* if multiple packets per frame are sent, the position at which

141 * to display the macroblocks is coded here */

142

143 mb_xy = s->mb_x + s->mb_y * s->mb_width;

144 if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) {

145 s->mb_x = get_bits(&s->gb, 6); /* mb_x */

146 s->mb_y = get_bits(&s->gb, 6); /* mb_y */

147 mb_count = get_bits(&s->gb, 12);

148 } else {

149 s->mb_x = 0;

150 s->mb_y = 0;

151 mb_count = s->mb_width * s->mb_height;

152 }

153 skip_bits(&s->gb, 3); /* ignored */

154 s->f_code = 1;

155

156 return mb_count;

157 }

158

159 static int rv20_decode_picture_header(RVDecContext *rv, int whole_size)

160 {

161 static const enum AVPictureType pict_types[] =

162 { AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I /* hmm ... */,

163 AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B };

164 MpegEncContext *s = &rv->m;

165 int seq, mb_pos, ret;

166 int rpr_max;

167

168 s->pict_type = pict_types[get_bits(&s->gb, 2)];

169

170 if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) {

171 av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");

172 return -1;

173 }

174 if (!s->last_picture_ptr && s->pict_type == AV_PICTURE_TYPE_B) {

175 av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");

176 return AVERROR_INVALIDDATA;

177 }

178

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

180 av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");

181 return AVERROR_INVALIDDATA;

182 }

183

184 s->qscale = get_bits(&s->gb, 5);

185 if (s->qscale == 0) {

186 av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");

187 return AVERROR_INVALIDDATA;

188 }

189

190 if (RV_GET_MINOR_VER(rv->sub_id) >= 2)

191 s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres;

192

193 if (RV_GET_MINOR_VER(rv->sub_id) <= 1)

194 seq = get_bits(&s->gb, 8) << 7;

195 else

196 seq = get_bits(&s->gb, 13) << 2;

197

198 rpr_max = s->avctx->extradata[1] & 7;

199 if (rpr_max) {

200 int f, new_w, new_h;

201 int rpr_bits = av_log2(rpr_max) + 1;

202

203 f = get_bits(&s->gb, rpr_bits);

204

205 if (f) {

206 if (s->avctx->extradata_size < 8 + 2 * f) {

207 av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");

208 return AVERROR_INVALIDDATA;

209 }

210

211 new_w = 4 * ((uint8_t *) s->avctx->extradata)[6 + 2 * f];

212 new_h = 4 * ((uint8_t *) s->avctx->extradata)[7 + 2 * f];

213 } else {

214 new_w = rv->orig_width;

215 new_h = rv->orig_height;

216 }

217 if (new_w != s->width || new_h != s->height || !s->context_initialized) {

218 AVRational old_aspect = s->avctx->sample_aspect_ratio;

219 av_log(s->avctx, AV_LOG_DEBUG,

220 "attempting to change resolution to %dx%d\n", new_w, new_h);

221 if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)

222 return AVERROR_INVALIDDATA;

223

224 if (whole_size < (new_w + 15)/16 * ((new_h + 15)/16) / 8)

225 return AVERROR_INVALIDDATA;

226

227 ff_mpv_common_end(s);

228

229 // attempt to keep aspect during typical resolution switches

230 if (!old_aspect.num)

231 old_aspect = (AVRational){1, 1};

232 if (2 * (int64_t)new_w * s->height == (int64_t)new_h * s->width)

233 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});

234 if ((int64_t)new_w * s->height == 2 * (int64_t)new_h * s->width)

235 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});

236

237 ret = ff_set_dimensions(s->avctx, new_w, new_h);

238 if (ret < 0)

239 return ret;

240

241 s->width = new_w;

242 s->height = new_h;

243 if ((ret = ff_mpv_common_init(s)) < 0)

244 return ret;

245 }

246

247 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {

248 av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d/%d\n", f, rpr_bits, rpr_max);

249 }

250 }

251 if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)

252 return AVERROR_INVALIDDATA;

253

254 mb_pos = ff_h263_decode_mba(s);

255

256 seq |= s->time & ~0x7FFF;

257 if (seq - s->time > 0x4000)

258 seq -= 0x8000;

259 if (seq - s->time < -0x4000)

260 seq += 0x8000;

261

262 if (seq != s->time) {

263 if (s->pict_type != AV_PICTURE_TYPE_B) {

264 s->time = seq;

265 s->pp_time = s->time - s->last_non_b_time;

266 s->last_non_b_time = s->time;

267 } else {

268 s->time = seq;

269 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);

270 }

271 }

272 if (s->pict_type == AV_PICTURE_TYPE_B) {

273 if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) {

274 av_log(s->avctx, AV_LOG_DEBUG,

275 "messed up order, possible from seeking? skipping current B-frame\n");

276 #define ERROR_SKIP_FRAME -123

277 return ERROR_SKIP_FRAME;

278 }

279 ff_mpeg4_init_direct_mv(s);

280 }

281

282 s->no_rounding = get_bits1(&s->gb);

283

284 if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)

285 // binary decoder reads 3+2 bits here but they don't seem to be used

286 skip_bits(&s->gb, 5);

287

288 s->f_code = 1;

289 s->h263_aic = s->pict_type == AV_PICTURE_TYPE_I;

290 s->modified_quant = 1;

291 if (!s->avctx->lowres)

292 s->loop_filter = 1;

293

294 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {

295 av_log(s->avctx, AV_LOG_INFO,

296 "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",

297 seq, s->mb_x, s->mb_y, s->pict_type, s->qscale,

298 s->no_rounding);

299 }

300

301 av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);

302

303 return s->mb_width * s->mb_height - mb_pos;

304 }

305

306 static av_cold void rv10_build_vlc(VLC *vlc, const uint16_t len_count[15],

307 const uint8_t sym_rl[][2], int sym_rl_elems)

308 {

309 uint16_t syms[MAX_VLC_ENTRIES];

310 uint8_t lens[MAX_VLC_ENTRIES];

311 unsigned nb_syms = 0, nb_lens = 0;

312

313 for (unsigned i = 0; i < sym_rl_elems; i++) {

314 unsigned cur_sym = sym_rl[i][0];

315 for (unsigned tmp = nb_syms + sym_rl[i][1]; nb_syms <= tmp; nb_syms++)

316 syms[nb_syms] = 0xFF & cur_sym--;

317 }

318

319 for (unsigned i = 0; i < 15; i++)

320 for (unsigned tmp = nb_lens + len_count[i]; nb_lens < tmp; nb_lens++)

321 lens[nb_lens] = i + 2;

322 av_assert1(nb_lens == nb_syms);

323 ff_vlc_init_from_lengths(vlc, DC_VLC_BITS, nb_lens, lens, 1,

324 syms, 2, 2, 0, VLC_INIT_STATIC_OVERLONG, NULL);

325 }

326

327 static av_cold void rv10_init_static(void)

328 {

329 static VLCElem table[1472 + 992];

330

331 rv_dc_lum.table = table;

332 rv_dc_lum.table_allocated = 1472;

333 rv10_build_vlc(&rv_dc_lum, rv_lum_len_count,

334 rv_sym_run_len, FF_ARRAY_ELEMS(rv_sym_run_len));

335 for (int i = 0; i < 1 << (DC_VLC_BITS - 7 /* Length of skip prefix */); i++) {

336 /* All codes beginning with 0x7F have the same length and value.

337 * Modifying the table directly saves us the useless subtables. */

338 rv_dc_lum.table[(0x7F << (DC_VLC_BITS - 7)) + i].sym = 255;

339 rv_dc_lum.table[(0x7F << (DC_VLC_BITS - 7)) + i].len = 18;

340 }

341 rv_dc_chrom.table = &table[1472];

342 rv_dc_chrom.table_allocated = 992;

343 rv10_build_vlc(&rv_dc_chrom, rv_chrom_len_count,

344 rv_sym_run_len, FF_ARRAY_ELEMS(rv_sym_run_len) - 2);

345 for (int i = 0; i < 1 << (DC_VLC_BITS - 9 /* Length of skip prefix */); i++) {

346 /* Same as above. */

347 rv_dc_chrom.table[(0x1FE << (DC_VLC_BITS - 9)) + i].sym = 255;

348 rv_dc_chrom.table[(0x1FE << (DC_VLC_BITS - 9)) + i].len = 18;

349 }

350 ff_h263_decode_init_vlc();

351 }

352

353 static av_cold int rv10_decode_init(AVCodecContext *avctx)

354 {

355 static AVOnce init_static_once = AV_ONCE_INIT;

356 RVDecContext *rv = avctx->priv_data;

357 MpegEncContext *s = &rv->m;

358 int major_ver, minor_ver, micro_ver, ret;

359

360 if (avctx->extradata_size < 8) {

361 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");

362 return AVERROR_INVALIDDATA;

363 }

364 if ((ret = av_image_check_size(avctx->coded_width,

365 avctx->coded_height, 0, avctx)) < 0)

366 return ret;

367

368 ff_mpv_decode_init(s, avctx);

369

370 s->out_format = FMT_H263;

371

372 rv->orig_width =

373 s->width = avctx->coded_width;

374 rv->orig_height =

375 s->height = avctx->coded_height;

376

377 s->h263_long_vectors = ((uint8_t *) avctx->extradata)[3] & 1;

378 rv->sub_id = AV_RB32((uint8_t *) avctx->extradata + 4);

379

380 major_ver = RV_GET_MAJOR_VER(rv->sub_id);

381 minor_ver = RV_GET_MINOR_VER(rv->sub_id);

382 micro_ver = RV_GET_MICRO_VER(rv->sub_id);

383

384 s->low_delay = 1;

385 switch (major_ver) {

386 case 1:

387 s->rv10_version = micro_ver ? 3 : 1;

388 s->obmc = micro_ver == 2;

389 break;

390 case 2:

391 if (minor_ver >= 2) {

392 s->low_delay = 0;

393 s->avctx->has_b_frames = 1;

394 }

395 break;

396 default:

397 av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);

398 avpriv_request_sample(avctx, "RV1/2 version");

399 return AVERROR_PATCHWELCOME;

400 }

401

402 if (avctx->debug & FF_DEBUG_PICT_INFO) {

403 av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%"PRIX32"\n", rv->sub_id,

404 ((uint32_t *) avctx->extradata)[0]);

405 }

406

407 avctx->pix_fmt = AV_PIX_FMT_YUV420P;

408

409 if ((ret = ff_mpv_common_init(s)) < 0)

410 return ret;

411

412 ff_h263dsp_init(&s->h263dsp);

413

414 /* init static VLCs */

415 ff_thread_once(&init_static_once, rv10_init_static);

416

417 return 0;

418 }

419

420 static av_cold int rv10_decode_end(AVCodecContext *avctx)

421 {

422 MpegEncContext *s = avctx->priv_data;

423

424 ff_mpv_common_end(s);

425 return 0;

426 }

427

428 static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,

429 int buf_size, int buf_size2, int whole_size)

430 {

431 RVDecContext *rv = avctx->priv_data;

432 MpegEncContext *s = &rv->m;

433 int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;

434

435 active_bits_size = buf_size * 8;

436 init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);

437 if (s->codec_id == AV_CODEC_ID_RV10)

438 mb_count = rv10_decode_picture_header(s);

439 else

440 mb_count = rv20_decode_picture_header(rv, whole_size);

441 if (mb_count < 0) {

442 if (mb_count != ERROR_SKIP_FRAME)

443 av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");

444 return AVERROR_INVALIDDATA;

445 }

446

447 if (s->mb_x >= s->mb_width ||

448 s->mb_y >= s->mb_height) {

449 av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);

450 return AVERROR_INVALIDDATA;

451 }

452 mb_pos = s->mb_y * s->mb_width + s->mb_x;

453 left = s->mb_width * s->mb_height - mb_pos;

454 if (mb_count > left) {

455 av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");

456 return AVERROR_INVALIDDATA;

457 }

458

459 if (whole_size < s->mb_width * s->mb_height / 8)

460 return AVERROR_INVALIDDATA;

461

462 if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) {

463 // FIXME write parser so we always have complete frames?

464 if (s->current_picture_ptr) {

465 ff_er_frame_end(&s->er, NULL);

466 ff_mpv_frame_end(s);

467 s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;

468 }

469 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)

470 return ret;

471 ff_mpeg_er_frame_start(s);

472 } else {

473 if (s->current_picture_ptr->f->pict_type != s->pict_type) {

474 av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");

475 return AVERROR_INVALIDDATA;

476 }

477 }

478

479

480 ff_dlog(avctx, "qscale=%d\n", s->qscale);

481

482 /* default quantization values */

483 if (s->codec_id == AV_CODEC_ID_RV10) {

484 if (s->mb_y == 0)

485 s->first_slice_line = 1;

486 } else {

487 s->first_slice_line = 1;

488 s->resync_mb_x = s->mb_x;

489 }

490 start_mb_x = s->mb_x;

491 s->resync_mb_y = s->mb_y;

492 if (s->h263_aic) {

493 s->y_dc_scale_table =

494 s->c_dc_scale_table = ff_aic_dc_scale_table;

495 } else {

496 s->y_dc_scale_table =

497 s->c_dc_scale_table = ff_mpeg1_dc_scale_table;

498 }

499

500 if (s->modified_quant)

501 s->chroma_qscale_table = ff_h263_chroma_qscale_table;

502

503 ff_set_qscale(s, s->qscale);

504

505 s->rv10_first_dc_coded[0] = 0;

506 s->rv10_first_dc_coded[1] = 0;

507 s->rv10_first_dc_coded[2] = 0;

508 s->block_wrap[0] =

509 s->block_wrap[1] =

510 s->block_wrap[2] =

511 s->block_wrap[3] = s->b8_stride;

512 s->block_wrap[4] =

513 s->block_wrap[5] = s->mb_stride;

514 ff_init_block_index(s);

515

516 /* decode each macroblock */

517 for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {

518 int ret;

519 ff_update_block_index(s, 8, s->avctx->lowres, 1);

520 ff_tlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);

521

522 s->mv_dir = MV_DIR_FORWARD;

523 s->mv_type = MV_TYPE_16X16;

524 ret = ff_h263_decode_mb(s, s->block);

525

526 // Repeat the slice end check from ff_h263_decode_mb with our active

527 // bitstream size

528 if (ret != SLICE_ERROR && active_bits_size >= get_bits_count(&s->gb)) {

529 int v = show_bits(&s->gb, 16);

530

531 if (get_bits_count(&s->gb) + 16 > active_bits_size)

532 v >>= get_bits_count(&s->gb) + 16 - active_bits_size;

533

534 if (!v)

535 ret = SLICE_END;

536 }

537 if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&

538 8 * buf_size2 >= get_bits_count(&s->gb)) {

539 active_bits_size = buf_size2 * 8;

540 av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",

541 8 * buf_size, active_bits_size);

542 ret = SLICE_OK;

543 }

544

545 if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {

546 av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x,

547 s->mb_y);

548 return AVERROR_INVALIDDATA;

549 }

550 if (s->pict_type != AV_PICTURE_TYPE_B)

551 ff_h263_update_motion_val(s);

552 ff_mpv_reconstruct_mb(s, s->block);

553 if (s->loop_filter)

554 ff_h263_loop_filter(s);

555

556 if (++s->mb_x == s->mb_width) {

557 s->mb_x = 0;

558 s->mb_y++;

559 ff_init_block_index(s);

560 }

561 if (s->mb_x == s->resync_mb_x)

562 s->first_slice_line = 0;

563 if (ret == SLICE_END)

564 break;

565 }

566

567 ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y,

568 ER_MB_END);

569

570 return active_bits_size;

571 }

572

573 static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

574 {

575 return AV_RL32(buf + n * 8);

576 }

577

578 static int rv10_decode_frame(AVCodecContext *avctx, AVFrame *pict,

579 int *got_frame, AVPacket *avpkt)

580 {

581 const uint8_t *buf = avpkt->data;

582 int buf_size = avpkt->size;

583 MpegEncContext *s = avctx->priv_data;

584 int i, ret;

585 int slice_count;

586 const uint8_t *slices_hdr = NULL;

587

588 ff_dlog(avctx, "*****frame %"PRId64" size=%d\n", avctx->frame_num, buf_size);

589

590 /* no supplementary picture */

591 if (buf_size == 0) {

592 return 0;

593 }

594

595 slice_count = (*buf++) + 1;

596 buf_size--;

597

598 if (!slice_count || buf_size <= 8 * slice_count) {

599 av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n",

600 slice_count);

601 return AVERROR_INVALIDDATA;

602 }

603

604 slices_hdr = buf + 4;

605 buf += 8 * slice_count;

606 buf_size -= 8 * slice_count;

607

608 for (i = 0; i < slice_count; i++) {

609 unsigned offset = get_slice_offset(avctx, slices_hdr, i);

610 int size, size2;

611

612 if (offset >= buf_size)

613 return AVERROR_INVALIDDATA;

614

615 if (i + 1 == slice_count)

616 size = buf_size - offset;

617 else

618 size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;

619

620 if (i + 2 >= slice_count)

621 size2 = buf_size - offset;

622 else

623 size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;

624

625 if (size <= 0 || size2 <= 0 ||

626 offset + FFMAX(size, size2) > buf_size)

627 return AVERROR_INVALIDDATA;

628

629 if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2, buf_size)) < 0)

630 return ret;

631

632 if (ret > 8 * size)

633 i++;

634 }

635

636 if (s->current_picture_ptr && s->mb_y >= s->mb_height) {

637 ff_er_frame_end(&s->er, NULL);

638 ff_mpv_frame_end(s);

639

640 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

641 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)

642 return ret;

643 ff_print_debug_info(s, s->current_picture_ptr, pict);

644 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG1);

645 } else if (s->last_picture_ptr) {

646 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)

647 return ret;

648 ff_print_debug_info(s, s->last_picture_ptr, pict);

649 ff_mpv_export_qp_table(s, pict,s->last_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG1);

650 }

651

652 if (s->last_picture_ptr || s->low_delay) {

653 *got_frame = 1;

654 }

655

656 // so we can detect if frame_end was not called (find some nicer solution...)

657 s->current_picture_ptr = NULL;

658 }

659

660 return avpkt->size;

661 }

662

663 const FFCodec ff_rv10_decoder = {

664 .p.name = "rv10",

665 CODEC_LONG_NAME("RealVideo 1.0"),

666 .p.type = AVMEDIA_TYPE_VIDEO,

667 .p.id = AV_CODEC_ID_RV10,

668 .priv_data_size = sizeof(RVDecContext),

669 .init = rv10_decode_init,

670 .close = rv10_decode_end,

671 FF_CODEC_DECODE_CB(rv10_decode_frame),

672 .p.capabilities = AV_CODEC_CAP_DR1,

673 .p.max_lowres = 3,

674 };

675

676 const FFCodec ff_rv20_decoder = {

677 .p.name = "rv20",

678 CODEC_LONG_NAME("RealVideo 2.0"),

679 .p.type = AVMEDIA_TYPE_VIDEO,

680 .p.id = AV_CODEC_ID_RV20,

681 .priv_data_size = sizeof(RVDecContext),

682 .init = rv10_decode_init,

683 .close = rv10_decode_end,

684 FF_CODEC_DECODE_CB(rv10_decode_frame),

685 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,

686 .flush = ff_mpeg_flush,

687 .p.max_lowres = 3,

688 };

ff_mpv_common_init

av_cold int ff_mpv_common_init(MpegEncContext *s)

init common structure for both encoder and decoder.

Definition: mpegvideo.c:681

MV_TYPE_16X16

#define MV_TYPE_16X16

1 vector for the whole mb

Definition: mpegvideo.h:261

h263data.h

ff_vlc_init_from_lengths

int ff_vlc_init_from_lengths(VLC *vlc, int nb_bits, int nb_codes, const int8_t *lens, int lens_wrap, const void *symbols, int symbols_wrap, int symbols_size, int offset, int flags, void *logctx)

Build VLC decoding tables suitable for use with get_vlc2()

Definition: vlc.c:306

RV_GET_MINOR_VER

#define RV_GET_MINOR_VER(x)

Definition: rv10.c:49

ff_mpv_export_qp_table

int ff_mpv_export_qp_table(const MpegEncContext *s, AVFrame *f, const Picture *p, int qp_type)

Definition: mpegvideo_dec.c:505

ff_h263_decode_mb

int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])

Definition: ituh263dec.c:787

thread.h

AVPictureType

Definition: avutil.h:277

int64_t

long long int64_t

Definition: coverity.c:34

get_bits_count

static int get_bits_count(const GetBitContext *s)

Definition: get_bits.h:266

AVFrame

This structure describes decoded (raw) audio or video data.

Definition: frame.h:344

tmp

static uint8_t tmp[11]

Definition: aes_ctr.c:28

AVPacket::data

uint8_t * data

Definition: packet.h:522

table

static const uint16_t table[]

Definition: prosumer.c:205

FFCodec

Definition: codec_internal.h:127

VLCElem::len

VLCBaseType len

Definition: vlc.h:33

ff_er_add_slice

void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)

Add a slice.

Definition: error_resilience.c:822

ff_init_block_index

void ff_init_block_index(MpegEncContext *s)

Definition: mpegvideo.c:845

mpegvideo.h

FFMAX

#define FFMAX(a, b)

Definition: macros.h:47

ff_h263_decode_mba

int ff_h263_decode_mba(MpegEncContext *s)

Definition: ituh263dec.c:142

mpegutils.h

ff_set_dimensions

int ff_set_dimensions(AVCodecContext *s, int width, int height)

Check that the provided frame dimensions are valid and set them on the codec context.

Definition: utils.c:94

init_get_bits

static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)

Initialize GetBitContext.

Definition: get_bits.h:514

RVDecContext

Definition: rv10.c:55

FF_DEBUG_PICT_INFO

#define FF_DEBUG_PICT_INFO

Definition: avcodec.h:1397

MAX_VLC_ENTRIES

#define MAX_VLC_ENTRIES

Definition: rv10.c:52

skip_bits

static void skip_bits(GetBitContext *s, int n)

Definition: get_bits.h:381

get_bits

static unsigned int get_bits(GetBitContext *s, int n)

Read 1-25 bits.

Definition: get_bits.h:335

ff_mpv_reconstruct_mb

void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])

Definition: mpegvideo_dec.c:1008

FFCodec::p

AVCodec p

The public AVCodec.

Definition: codec_internal.h:131

ff_h263dsp_init

av_cold void ff_h263dsp_init(H263DSPContext *ctx)

Definition: h263dsp.c:117

VLCElem::sym

VLCBaseType sym

Definition: vlc.h:33

AVCodecContext::coded_height

int coded_height

Definition: avcodec.h:633

ff_print_debug_info

void ff_print_debug_info(const MpegEncContext *s, const Picture *p, AVFrame *pict)

Definition: mpegvideo_dec.c:498

SLICE_END

#define SLICE_END

end marker found

Definition: mpegvideo.h:473

ff_h263_update_motion_val

void ff_h263_update_motion_val(MpegEncContext *s)

Definition: h263.c:53

AVRational::num

int num

Numerator.

Definition: rational.h:59

rv10_decode_end

static av_cold int rv10_decode_end(AVCodecContext *avctx)

Definition: rv10.c:420

ff_mpv_common_end

void ff_mpv_common_end(MpegEncContext *s)

Definition: mpegvideo.c:782

ff_thread_once

static int ff_thread_once(char *control, void(*routine)(void))

Definition: thread.h:205

mpegvideodec.h

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:180

h263dec.h

FF_ARRAY_ELEMS

#define FF_ARRAY_ELEMS(a)

Definition: sinewin_tablegen.c:29

av_cold

#define av_cold

Definition: attributes.h:90

rv10_decode_picture_header

static int rv10_decode_picture_header(MpegEncContext *s)

Definition: rv10.c:101

AVCodecContext::extradata_size

int extradata_size

Definition: avcodec.h:524

ff_er_frame_end

void ff_er_frame_end(ERContext *s, int *decode_error_flags)

Indicate that a frame has finished decoding and perform error concealment in case it has been enabled...

Definition: error_resilience.c:892

FF_CODEC_DECODE_CB

#define FF_CODEC_DECODE_CB(func)

Definition: codec_internal.h:287

ff_h263_chroma_qscale_table

const uint8_t ff_h263_chroma_qscale_table[32]

Definition: h263data.c:260

#define s(width, name)

Definition: cbs_vp9.c:198

RV_GET_MAJOR_VER

#define RV_GET_MAJOR_VER(x)

Definition: rv10.c:48

ff_mpeg_er_frame_start

void ff_mpeg_er_frame_start(MpegEncContext *s)

Definition: mpeg_er.c:47

ff_mpeg1_dc_scale_table

static const uint8_t *const ff_mpeg1_dc_scale_table

Definition: mpegvideodata.h:32

av_assert0

#define av_assert0(cond)

assert() equivalent, that is always enabled.

Definition: avassert.h:40

AV_LOG_DEBUG

#define AV_LOG_DEBUG

Stuff which is only useful for libav* developers.

Definition: log.h:201

rv_dc_chrom

static VLC rv_dc_chrom

Definition: rv10.c:82

decode.h

rv10_build_vlc

static av_cold void rv10_build_vlc(VLC *vlc, const uint16_t len_count[15], const uint8_t sym_rl[][2], int sym_rl_elems)

Definition: rv10.c:306

AV_PIX_FMT_YUV420P

@ AV_PIX_FMT_YUV420P

planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)

Definition: pixfmt.h:73

CODEC_LONG_NAME

#define CODEC_LONG_NAME(str)

Definition: codec_internal.h:272

ff_h263_decode_init_vlc

void ff_h263_decode_init_vlc(void)

Definition: ituh263dec.c:136

RVDecContext::orig_height

int orig_height

Definition: rv10.c:58

AV_ONCE_INIT

#define AV_ONCE_INIT

Definition: thread.h:203

NULL

#define NULL

Definition: coverity.c:32

AVERROR_PATCHWELCOME

#define AVERROR_PATCHWELCOME

Not yet implemented in FFmpeg, patches welcome.

Definition: error.h:64

RVDecContext::orig_width

int orig_width

Definition: rv10.c:58

AVRational

Rational number (pair of numerator and denominator).

Definition: rational.h:58

ERROR_SKIP_FRAME

#define ERROR_SKIP_FRAME

AV_PICTURE_TYPE_I

@ AV_PICTURE_TYPE_I

Intra.

Definition: avutil.h:279

get_bits1

static unsigned int get_bits1(GetBitContext *s)

Definition: get_bits.h:388

ff_set_qscale

void ff_set_qscale(MpegEncContext *s, int qscale)

set qscale and update qscale dependent variables.

Definition: mpegvideo.c:878

get_vlc2

static av_always_inline int get_vlc2(GetBitContext *s, const VLCElem *table, int bits, int max_depth)

Parse a vlc code.

Definition: get_bits.h:652

FF_MPV_QSCALE_TYPE_MPEG1

#define FF_MPV_QSCALE_TYPE_MPEG1

Definition: mpegvideodec.h:40

AVOnce

#define AVOnce

Definition: thread.h:202

rv10_decode_frame

static int rv10_decode_frame(AVCodecContext *avctx, AVFrame *pict, int *got_frame, AVPacket *avpkt)

Definition: rv10.c:578

rv_chrom_len_count

static const uint16_t rv_chrom_len_count[15]

Definition: rv10.c:78

ff_dlog

#define ff_dlog(a,...)

Definition: tableprint_vlc.h:28

VLC::table_allocated

int table_allocated

Definition: vlc.h:39

ff_rv20_decoder

const FFCodec ff_rv20_decoder

Definition: rv10.c:676

rv_dc_lum

static VLC rv_dc_lum

Definition: rv10.c:82

Definition: af_crystalizer.c:121

init

int(* init)(AVBSFContext *ctx)

Definition: dts2pts.c:365

AV_CODEC_CAP_DR1

#define AV_CODEC_CAP_DR1

Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.

Definition: codec.h:52

AVPacket::size

int size

Definition: packet.h:523

RV_GET_MICRO_VER

#define RV_GET_MICRO_VER(x)

Definition: rv10.c:50

av_frame_ref

int av_frame_ref(AVFrame *dst, const AVFrame *src)

Set up a new reference to the data described by the source frame.

Definition: frame.c:354

codec_internal.h

ff_update_block_index

static void ff_update_block_index(MpegEncContext *s, int bits_per_raw_sample, int lowres, int chroma_x_shift)

Definition: mpegvideo.h:594

size

int size

Definition: twinvq_data.h:10344

VLCElem

Definition: vlc.h:32

AV_RB32

uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32

Definition: bytestream.h:96

ff_mpv_frame_start

int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)

generic function called after decoding the header and before a frame is decoded.

Definition: mpegvideo_dec.c:295

ff_mpeg_flush

void ff_mpeg_flush(AVCodecContext *avctx)

Definition: mpegvideo_dec.c:543

RVDecContext::m

MpegEncContext m

Definition: rv10.c:56

mpegvideodata.h

offset

it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset

Definition: writing_filters.txt:86

rv10_decode_packet

static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int buf_size2, int whole_size)

Definition: rv10.c:428

AV_LOG_INFO

#define AV_LOG_INFO

Standard information.

Definition: log.h:191

rv_sym_run_len

static const uint8_t rv_sym_run_len[][2]

Definition: rv10.c:65

ff_rv_decode_dc

int ff_rv_decode_dc(MpegEncContext *s, int n)

Definition: rv10.c:84

rv10_init_static

static av_cold void rv10_init_static(void)

Definition: rv10.c:327

FMT_H263

@ FMT_H263

Definition: mpegutils.h:119

AV_CODEC_ID_RV10

@ AV_CODEC_ID_RV10

Definition: codec_id.h:57

#define i(width, name, range_min, range_max)

Definition: cbs_h2645.c:255

code

and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code

Definition: filter_design.txt:178

AVCodecContext::extradata

uint8_t * extradata

some codecs need / can use extradata like Huffman tables.

Definition: avcodec.h:523

show_bits

static unsigned int show_bits(GetBitContext *s, int n)

Show 1-25 bits.

Definition: get_bits.h:371

ff_mpv_decode_init

void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)

Initialize the given MpegEncContext for decoding.

Definition: mpegvideo_dec.c:45

av_assert1

#define av_assert1(cond)

assert() equivalent, that does not lie in speed critical code.

Definition: avassert.h:56

AV_CODEC_ID_RV20

@ AV_CODEC_ID_RV20

Definition: codec_id.h:58

AVCodec::name

const char * name

Name of the codec implementation.

Definition: codec.h:194

AVCodecContext::pix_fmt

enum AVPixelFormat pix_fmt

Pixel format, see AV_PIX_FMT_xxx.

Definition: avcodec.h:657

ff_rv10_decoder

const FFCodec ff_rv10_decoder

Definition: rv10.c:663

avcodec.h

AVCodecContext::frame_num

int64_t frame_num

Frame counter, set by libavcodec.

Definition: avcodec.h:2030

get_slice_offset

static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

Definition: rv10.c:573

ret

Definition: filter_design.txt:187

SLICE_OK

#define SLICE_OK

Definition: mpegvideo.h:471

ff_aic_dc_scale_table

const uint8_t ff_aic_dc_scale_table[32]

Definition: h263data.c:245

rv20_decode_picture_header

static int rv20_decode_picture_header(RVDecContext *rv, int whole_size)

Definition: rv10.c:159

ff_h263_loop_filter

void ff_h263_loop_filter(MpegEncContext *s)

Definition: h263.c:105

ff_mpeg4_init_direct_mv

void ff_mpeg4_init_direct_mv(MpegEncContext *s)

Definition: mpeg4video.c:83

left

Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left

Definition: snow.txt:386

AV_RL32

uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32

Definition: bytestream.h:92

rv_lum_len_count

static const uint16_t rv_lum_len_count[15]

Definition: rv10.c:74

AVCodecContext

main external API structure.

Definition: avcodec.h:445

VLC_INIT_STATIC_OVERLONG

#define VLC_INIT_STATIC_OVERLONG