FFmpeg: libavcodec/dnxhddec.c Source File

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dnxhddec.c

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1 /*

2 * VC3/DNxHD decoder.

5 *

6 * 10 bit support added by MirriAd Ltd, Joseph Artsimovich <joseph@mirriad.com>

7 *

8 * This file is part of FFmpeg.

9 *

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

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

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

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

14 *

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

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

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

18 * Lesser General Public License for more details.

19 *

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

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

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

23 */

25 #include "libavutil/imgutils.h"

26 #include "libavutil/timer.h"

27 #include "avcodec.h"

28 #include "blockdsp.h"

29 #include "get_bits.h"

30 #include "dnxhddata.h"

31 #include "idctdsp.h"

32 #include "internal.h"

33 #include "thread.h"

35 typedef struct DNXHDContext {

36 AVCodecContext *avctx;

37 GetBitContext gb;

38 BlockDSPContext bdsp;

39 int64_t cid; ///< compression id

40 unsigned int width, height;

41 enum AVPixelFormat pix_fmt;

42 unsigned int mb_width, mb_height;

43 uint32_t mb_scan_index[68]; /* max for 1080p */

44 int cur_field; ///< current interlaced field

45 VLC ac_vlc, dc_vlc, run_vlc;

46 int last_dc[3];

47 IDCTDSPContext idsp;

48 DECLARE_ALIGNED(16, int16_t, blocks)[12][64];

49 ScanTable scantable;

50 const CIDEntry *cid_table;

51 int bit_depth; // 8, 10 or 0 if not initialized at all.

52 int is_444;

53 void (*decode_dct_block)(struct DNXHDContext *ctx, int16_t *block,

54 int n, int qscale);

55 int last_qscale;

56 int luma_scale[64];

57 int chroma_scale[64];

58 } DNXHDContext;

60 #define DNXHD_VLC_BITS 9

61 #define DNXHD_DC_VLC_BITS 7

63 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block,

64 int n, int qscale);

65 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block,

66 int n, int qscale);

67 static void dnxhd_decode_dct_block_10_444(DNXHDContext *ctx, int16_t *block,

68 int n, int qscale);

70 static av_cold int dnxhd_decode_init(AVCodecContext *avctx)

71 {

72 DNXHDContext *ctx = avctx->priv_data;

74 ctx->avctx = avctx;

75 ctx->cid = -1;

76 return 0;

77 }

79 static int dnxhd_init_vlc(DNXHDContext *ctx, uint32_t cid)

80 {

81 if (cid != ctx->cid) {

82 int index;

84 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {

85 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);

86 return AVERROR(ENOSYS);

87 }

88 if (ff_dnxhd_cid_table[index].bit_depth != ctx->bit_depth) {

89 av_log(ctx->avctx, AV_LOG_ERROR, "bit depth mismatches %d %d\n", ff_dnxhd_cid_table[index].bit_depth, ctx->bit_depth);

90 return AVERROR_INVALIDDATA;

91 }

92 ctx->cid_table = &ff_dnxhd_cid_table[index];

94 ff_free_vlc(&ctx->ac_vlc);

95 ff_free_vlc(&ctx->dc_vlc);

96 ff_free_vlc(&ctx->run_vlc);

98 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,

99 ctx->cid_table->ac_bits, 1, 1,

100 ctx->cid_table->ac_codes, 2, 2, 0);

101 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->bit_depth + 4,

102 ctx->cid_table->dc_bits, 1, 1,

103 ctx->cid_table->dc_codes, 1, 1, 0);

104 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,

105 ctx->cid_table->run_bits, 1, 1,

106 ctx->cid_table->run_codes, 2, 2, 0);

107

108 ff_init_scantable(ctx->idsp.idct_permutation, &ctx->scantable,

109 ff_zigzag_direct);

110 ctx->cid = cid;

111 }

112 return 0;

113 }

114

115 static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,

116 const uint8_t *buf, int buf_size,

117 int first_field)

118 {

119 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };

120 static const uint8_t header_prefix444[] = { 0x00, 0x00, 0x02, 0x80, 0x02 };

121 int i, cid, ret;

122

123 if (buf_size < 0x280) {

124 av_log(ctx->avctx, AV_LOG_ERROR, "buffer too small (%d < 640).\n",

125 buf_size);

126 return AVERROR_INVALIDDATA;

127 }

128

129 if (memcmp(buf, header_prefix, 5) && memcmp(buf, header_prefix444, 5)) {

130 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");

131 return AVERROR_INVALIDDATA;

132 }

133 if (buf[5] & 2) { /* interlaced */

134 ctx->cur_field = buf[5] & 1;

135 frame->interlaced_frame = 1;

136 frame->top_field_first = first_field ^ ctx->cur_field;

137 av_log(ctx->avctx, AV_LOG_DEBUG,

138 "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);

139 }

140

141 ctx->height = AV_RB16(buf + 0x18);

142 ctx->width = AV_RB16(buf + 0x1a);

143

144 av_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);

145

146 if (!ctx->bit_depth) {

147 ff_blockdsp_init(&ctx->bdsp, ctx->avctx);

148 ff_idctdsp_init(&ctx->idsp, ctx->avctx);

149 }

150 if (buf[0x21] == 0x58) { /* 10 bit */

151 ctx->bit_depth = ctx->avctx->bits_per_raw_sample = 10;

152

153 if (buf[0x4] == 0x2) {

154 ctx->decode_dct_block = dnxhd_decode_dct_block_10_444;

155 ctx->pix_fmt = AV_PIX_FMT_YUV444P10;

156 ctx->is_444 = 1;

157 } else {

158 ctx->decode_dct_block = dnxhd_decode_dct_block_10;

159 ctx->pix_fmt = AV_PIX_FMT_YUV422P10;

160 }

161 } else if (buf[0x21] == 0x38) { /* 8 bit */

162 ctx->bit_depth = ctx->avctx->bits_per_raw_sample = 8;

163

164 ctx->pix_fmt = AV_PIX_FMT_YUV422P;

165 ctx->decode_dct_block = dnxhd_decode_dct_block_8;

166 } else {

167 av_log(ctx->avctx, AV_LOG_ERROR, "invalid bit depth value (%d).\n",

168 buf[0x21]);

169 return AVERROR_INVALIDDATA;

170 }

171

172 cid = AV_RB32(buf + 0x28);

173 av_dlog(ctx->avctx, "compression id %d\n", cid);

174

175 if ((ret = dnxhd_init_vlc(ctx, cid)) < 0)

176 return ret;

177

178 // make sure profile size constraints are respected

179 // DNx100 allows 1920->1440 and 1280->960 subsampling

180 if (ctx->width != ctx->cid_table->width) {

181 av_reduce(&ctx->avctx->sample_aspect_ratio.num,

182 &ctx->avctx->sample_aspect_ratio.den,

183 ctx->width, ctx->cid_table->width, 255);

184 ctx->width = ctx->cid_table->width;

185 }

186

187 if (buf_size < ctx->cid_table->coding_unit_size) {

188 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size (%d < %d).\n",

189 buf_size, ctx->cid_table->coding_unit_size);

190 return AVERROR_INVALIDDATA;

191 }

192

193 ctx->mb_width = ctx->width >> 4;

194 ctx->mb_height = buf[0x16d];

195

196 av_dlog(ctx->avctx,

197 "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);

198

199 if ((ctx->height + 15) >> 4 == ctx->mb_height && frame->interlaced_frame)

200 ctx->height <<= 1;

201

202 if (ctx->mb_height > 68 ||

203 (ctx->mb_height << frame->interlaced_frame) > (ctx->height + 15) >> 4) {

204 av_log(ctx->avctx, AV_LOG_ERROR,

205 "mb height too big: %d\n", ctx->mb_height);

206 return AVERROR_INVALIDDATA;

207 }

208

209 for (i = 0; i < ctx->mb_height; i++) {

210 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i << 2));

211 av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);

212 if (buf_size < ctx->mb_scan_index[i] + 0x280LL) {

213 av_log(ctx->avctx, AV_LOG_ERROR,

214 "invalid mb scan index (%d < %d).\n",

215 buf_size, ctx->mb_scan_index[i] + 0x280);

216 return AVERROR_INVALIDDATA;

217 }

218 }

219

220 return 0;

221 }

222

223 static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,

224 int16_t *block, int n,

225 int qscale,

226 int index_bits,

227 int level_bias,

228 int level_shift)

229 {

230 int i, j, index1, index2, len, flags;

231 int level, component, sign;

232 const int *scale;

233 const uint8_t *weight_matrix;

234 const uint8_t *ac_level = ctx->cid_table->ac_level;

235 const uint8_t *ac_flags = ctx->cid_table->ac_flags;

236 const int eob_index = ctx->cid_table->eob_index;

237 OPEN_READER(bs, &ctx->gb);

238

239 if (!ctx->is_444) {

240 if (n & 2) {

241 component = 1 + (n & 1);

242 scale = ctx->chroma_scale;

243 weight_matrix = ctx->cid_table->chroma_weight;

244 } else {

245 component = 0;

246 scale = ctx->luma_scale;

247 weight_matrix = ctx->cid_table->luma_weight;

248 }

249 } else {

250 component = (n >> 1) % 3;

251 if (component) {

252 scale = ctx->chroma_scale;

253 weight_matrix = ctx->cid_table->chroma_weight;

254 } else {

255 scale = ctx->luma_scale;

256 weight_matrix = ctx->cid_table->luma_weight;

257 }

258 }

259

260 UPDATE_CACHE(bs, &ctx->gb);

261 GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);

262 if (len) {

263 level = GET_CACHE(bs, &ctx->gb);

264 LAST_SKIP_BITS(bs, &ctx->gb, len);

265 sign = ~level >> 31;

266 level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;

267 ctx->last_dc[component] += level;

268 }

269 block[0] = ctx->last_dc[component];

270

271 i = 0;

272

273 UPDATE_CACHE(bs, &ctx->gb);

274 GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,

275 DNXHD_VLC_BITS, 2);

276

277 while (index1 != eob_index) {

278 level = ac_level[index1];

279 flags = ac_flags[index1];

280

281 sign = SHOW_SBITS(bs, &ctx->gb, 1);

282 SKIP_BITS(bs, &ctx->gb, 1);

283

284 if (flags & 1) {

285 level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 7;

286 SKIP_BITS(bs, &ctx->gb, index_bits);

287 }

288

289 if (flags & 2) {

290 UPDATE_CACHE(bs, &ctx->gb);

291 GET_VLC(index2, bs, &ctx->gb, ctx->run_vlc.table,

292 DNXHD_VLC_BITS, 2);

293 i += ctx->cid_table->run[index2];

294 }

295

296 if (++i > 63) {

297 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);

298 break;

299 }

300

301 j = ctx->scantable.permutated[i];

302 level *= scale[i];

303 if (level_bias < 32 || weight_matrix[i] != level_bias)

304 level += level_bias;

305 level >>= level_shift;

306

307 block[j] = (level ^ sign) - sign;

308

309 UPDATE_CACHE(bs, &ctx->gb);

310 GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,

311 DNXHD_VLC_BITS, 2);

312 }

313

314 CLOSE_READER(bs, &ctx->gb);

315 }

316

317 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block,

318 int n, int qscale)

319 {

320 dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);

321 }

322

323 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block,

324 int n, int qscale)

325 {

326 dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);

327 }

328

329 static void dnxhd_decode_dct_block_10_444(DNXHDContext *ctx, int16_t *block,

330 int n, int qscale)

331 {

332 dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 32, 6);

333 }

334

335 static int dnxhd_decode_macroblock(DNXHDContext *ctx, AVFrame *frame,

336 int x, int y)

337 {

338 int shift1 = ctx->bit_depth == 10;

339 int dct_linesize_luma = frame->linesize[0];

340 int dct_linesize_chroma = frame->linesize[1];

341 uint8_t *dest_y, *dest_u, *dest_v;

342 int dct_y_offset, dct_x_offset;

343 int qscale, i;

344

345 qscale = get_bits(&ctx->gb, 11);

346 skip_bits1(&ctx->gb);

347

348 if (qscale != ctx->last_qscale) {

349 for (i = 0; i < 64; i++) {

350 ctx->luma_scale[i] = qscale * ctx->cid_table->luma_weight[i];

351 ctx->chroma_scale[i] = qscale * ctx->cid_table->chroma_weight[i];

352 }

353 ctx->last_qscale = qscale;

354 }

355

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

357 ctx->bdsp.clear_block(ctx->blocks[i]);

358 ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);

359 }

360 if (ctx->is_444) {

361 for (; i < 12; i++) {

362 ctx->bdsp.clear_block(ctx->blocks[i]);

363 ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);

364 }

365 }

366

367 if (frame->interlaced_frame) {

368 dct_linesize_luma <<= 1;

369 dct_linesize_chroma <<= 1;

370 }

371

372 dest_y = frame->data[0] + ((y * dct_linesize_luma) << 4) + (x << (4 + shift1));

373 dest_u = frame->data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1 + ctx->is_444));

374 dest_v = frame->data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1 + ctx->is_444));

375

376 if (ctx->cur_field) {

377 dest_y += frame->linesize[0];

378 dest_u += frame->linesize[1];

379 dest_v += frame->linesize[2];

380 }

381

382 dct_y_offset = dct_linesize_luma << 3;

383 dct_x_offset = 8 << shift1;

384 if (!ctx->is_444) {

385 ctx->idsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);

386 ctx->idsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);

387 ctx->idsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);

388 ctx->idsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);

389

390 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {

391 dct_y_offset = dct_linesize_chroma << 3;

392 ctx->idsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);

393 ctx->idsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);

394 ctx->idsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[6]);

395 ctx->idsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);

396 }

397 } else {

398 ctx->idsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);

399 ctx->idsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);

400 ctx->idsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[6]);

401 ctx->idsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[7]);

402

403 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {

404 dct_y_offset = dct_linesize_chroma << 3;

405 ctx->idsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);

406 ctx->idsp.idct_put(dest_u + dct_x_offset, dct_linesize_chroma, ctx->blocks[3]);

407 ctx->idsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[8]);

408 ctx->idsp.idct_put(dest_u + dct_y_offset + dct_x_offset, dct_linesize_chroma, ctx->blocks[9]);

409 ctx->idsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[4]);

410 ctx->idsp.idct_put(dest_v + dct_x_offset, dct_linesize_chroma, ctx->blocks[5]);

411 ctx->idsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[10]);

412 ctx->idsp.idct_put(dest_v + dct_y_offset + dct_x_offset, dct_linesize_chroma, ctx->blocks[11]);

413 }

414 }

415

416 return 0;

417 }

418

419 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, AVFrame *frame,

420 const uint8_t *buf, int buf_size)

421 {

422 int x, y;

423 for (y = 0; y < ctx->mb_height; y++) {

424 ctx->last_dc[0] =

425 ctx->last_dc[1] =

426 ctx->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)

427 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);

428 for (x = 0; x < ctx->mb_width; x++) {

429 //START_TIMER;

430 dnxhd_decode_macroblock(ctx, frame, x, y);

431 //STOP_TIMER("decode macroblock");

432 }

433 }

434 return 0;

435 }

436

437 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data,

438 int *got_frame, AVPacket *avpkt)

439 {

440 const uint8_t *buf = avpkt->data;

441 int buf_size = avpkt->size;

442 DNXHDContext *ctx = avctx->priv_data;

443 ThreadFrame frame = { .f = data };

444 AVFrame *picture = data;

445 int first_field = 1;

446 int ret;

447

448 av_dlog(avctx, "frame size %d\n", buf_size);

449

450 decode_coding_unit:

451 if ((ret = dnxhd_decode_header(ctx, picture, buf, buf_size, first_field)) < 0)

452 return ret;

453

454 if ((avctx->width || avctx->height) &&

455 (ctx->width != avctx->width || ctx->height != avctx->height)) {

456 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",

457 avctx->width, avctx->height, ctx->width, ctx->height);

458 first_field = 1;

459 }

460 if (avctx->pix_fmt != AV_PIX_FMT_NONE && avctx->pix_fmt != ctx->pix_fmt) {

461 av_log(avctx, AV_LOG_WARNING, "pix_fmt changed: %s -> %s\n",

462 av_get_pix_fmt_name(avctx->pix_fmt), av_get_pix_fmt_name(ctx->pix_fmt));

463 first_field = 1;

464 }

465

466 avctx->pix_fmt = ctx->pix_fmt;

467 ret = ff_set_dimensions(avctx, ctx->width, ctx->height);

468 if (ret < 0)

469 return ret;

470

471 if (first_field) {

472 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)

473 return ret;

474 picture->pict_type = AV_PICTURE_TYPE_I;

475 picture->key_frame = 1;

476 }

477

478 dnxhd_decode_macroblocks(ctx, picture, buf + 0x280, buf_size - 0x280);

479

480 if (first_field && picture->interlaced_frame) {

481 buf += ctx->cid_table->coding_unit_size;

482 buf_size -= ctx->cid_table->coding_unit_size;

483 first_field = 0;

484 goto decode_coding_unit;

485 }

486

487 *got_frame = 1;

488 return avpkt->size;

489 }

490

491 static av_cold int dnxhd_decode_close(AVCodecContext *avctx)

492 {

493 DNXHDContext *ctx = avctx->priv_data;

494

495 ff_free_vlc(&ctx->ac_vlc);

496 ff_free_vlc(&ctx->dc_vlc);

497 ff_free_vlc(&ctx->run_vlc);

498 return 0;

499 }

500

501 AVCodec ff_dnxhd_decoder = {

502 .name = "dnxhd",

503 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),

504 .type = AVMEDIA_TYPE_VIDEO,

505 .id = AV_CODEC_ID_DNXHD,

506 .priv_data_size = sizeof(DNXHDContext),

507 .init = dnxhd_decode_init,

508 .close = dnxhd_decode_close,

509 .decode = dnxhd_decode_frame,

510 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,

511 };

Generated on Sun Mar 8 2015 02:34:50 for FFmpeg by doxygen 1.8.2