FFmpeg: libavcodec/pthread.c Source File

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libavcodec

pthread.c

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1 /*

4 *

5 * Many thanks to Steven M. Schultz for providing clever ideas and

6 * to Michael Niedermayer <michaelni@gmx.at> for writing initial

7 * implementation.

8 *

9 * This file is part of FFmpeg.

10 *

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

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

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

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

15 *

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

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

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

19 * Lesser General Public License for more details.

20 *

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

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

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

24 */

26 /**

27 * @file

28 * Multithreading support functions

29 * @see doc/multithreading.txt

30 */

32 #include "config.h"

34 #include "avcodec.h"

35 #include "internal.h"

36 #include "thread.h"

37 #include "libavutil/avassert.h"

38 #include "libavutil/common.h"

39 #include "libavutil/cpu.h"

41 #if HAVE_PTHREADS

42 #include <pthread.h>

43 #elif HAVE_W32THREADS

44 #include "compat/w32pthreads.h"

45 #elif HAVE_OS2THREADS

46 #include "compat/os2threads.h"

47 #endif

49 typedef int (action_func)(AVCodecContext *c, void *arg);

50 typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);

52 typedef struct ThreadContext {

53 pthread_t *workers;

54 action_func *func;

55 action_func2 *func2;

56 void *args;

57 int *rets;

58 int rets_count;

59 int job_count;

60 int job_size;

62 pthread_cond_t last_job_cond;

63 pthread_cond_t current_job_cond;

64 pthread_mutex_t current_job_lock;

65 int current_job;

66 unsigned int current_execute;

67 int done;

68 } ThreadContext;

70 /**

71 * Context used by codec threads and stored in their AVCodecContext thread_opaque.

72 */

73 typedef struct PerThreadContext {

74 struct FrameThreadContext *parent;

76 pthread_t thread;

77 int thread_init;

78 pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.

79 pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.

80 pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.

82 pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.

83 pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.

85 AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.

87 AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).

88 uint8_t *buf; ///< backup storage for packet data when the input packet is not refcounted

89 int allocated_buf_size; ///< Size allocated for buf

91 AVFrame frame; ///< Output frame (for decoding) or input (for encoding).

92 int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.

93 int result; ///< The result of the last codec decode/encode() call.

95 enum {

96 STATE_INPUT_READY, ///< Set when the thread is awaiting a packet.

97 STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().

98 STATE_GET_BUFFER, /**<

99 * Set when the codec calls get_buffer().

100 * State is returned to STATE_SETTING_UP afterwards.

101 */

102 STATE_GET_FORMAT, /**<

103 * Set when the codec calls get_format().

104 * State is returned to STATE_SETTING_UP afterwards.

105 */

106 STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().

107 } state;

108

109 /**

110 * Array of frames passed to ff_thread_release_buffer().

111 * Frames are released after all threads referencing them are finished.

112 */

113 AVFrame *released_buffers;

114 int num_released_buffers;

115 int released_buffers_allocated;

116

117 AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()

118 int requested_flags; ///< flags passed to get_buffer() for requested_frame

119

120 const enum AVPixelFormat *available_formats; ///< Format array for get_format()

121 enum AVPixelFormat result_format; ///< get_format() result

122 } PerThreadContext;

123

124 /**

125 * Context stored in the client AVCodecContext thread_opaque.

126 */

127 typedef struct FrameThreadContext {

128 PerThreadContext *threads; ///< The contexts for each thread.

129 PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.

130

131 pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().

132

133 int next_decoding; ///< The next context to submit a packet to.

134 int next_finished; ///< The next context to return output from.

135

136 int delaying; /**<

137 * Set for the first N packets, where N is the number of threads.

138 * While it is set, ff_thread_en/decode_frame won't return any results.

139 */

140

141 int die; ///< Set when threads should exit.

142 } FrameThreadContext;

143

144

145 /* H264 slice threading seems to be buggy with more than 16 threads,

146 * limit the number of threads to 16 for automatic detection */

147 #define MAX_AUTO_THREADS 16

148

149 static void* attribute_align_arg worker(void *v)

150 {

151 AVCodecContext *avctx = v;

152 ThreadContext *c = avctx->thread_opaque;

153 int our_job = c->job_count;

154 int last_execute = 0;

155 int thread_count = avctx->thread_count;

156 int self_id;

157

158 pthread_mutex_lock(&c->current_job_lock);

159 self_id = c->current_job++;

160 for (;;){

161 while (our_job >= c->job_count) {

162 if (c->current_job == thread_count + c->job_count)

163 pthread_cond_signal(&c->last_job_cond);

164

165 while (last_execute == c->current_execute && !c->done)

166 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);

167 last_execute = c->current_execute;

168 our_job = self_id;

169

170 if (c->done) {

171 pthread_mutex_unlock(&c->current_job_lock);

172 return NULL;

173 }

174 }

175 pthread_mutex_unlock(&c->current_job_lock);

176

177 c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):

178 c->func2(avctx, c->args, our_job, self_id);

179

180 pthread_mutex_lock(&c->current_job_lock);

181 our_job = c->current_job++;

182 }

183 }

184

185 static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)

186 {

187 while (c->current_job != thread_count + c->job_count)

188 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);

189 pthread_mutex_unlock(&c->current_job_lock);

190 }

191

192 static void thread_free(AVCodecContext *avctx)

193 {

194 ThreadContext *c = avctx->thread_opaque;

195 int i;

196

197 pthread_mutex_lock(&c->current_job_lock);

198 c->done = 1;

199 pthread_cond_broadcast(&c->current_job_cond);

200 pthread_mutex_unlock(&c->current_job_lock);

201

202 for (i=0; i<avctx->thread_count; i++)

203 pthread_join(c->workers[i], NULL);

204

205 pthread_mutex_destroy(&c->current_job_lock);

206 pthread_cond_destroy(&c->current_job_cond);

207 pthread_cond_destroy(&c->last_job_cond);

208 av_free(c->workers);

209 av_freep(&avctx->thread_opaque);

210 }

211

212 static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)

213 {

214 ThreadContext *c= avctx->thread_opaque;

215 int dummy_ret;

216

217 if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)

218 return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);

219

220 if (job_count <= 0)

221 return 0;

222

223 pthread_mutex_lock(&c->current_job_lock);

224

225 c->current_job = avctx->thread_count;

226 c->job_count = job_count;

227 c->job_size = job_size;

228 c->args = arg;

229 c->func = func;

230 if (ret) {

231 c->rets = ret;

232 c->rets_count = job_count;

233 } else {

234 c->rets = &dummy_ret;

235 c->rets_count = 1;

236 }

237 c->current_execute++;

238 pthread_cond_broadcast(&c->current_job_cond);

239

240 avcodec_thread_park_workers(c, avctx->thread_count);

241

242 return 0;

243 }

244

245 static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)

246 {

247 ThreadContext *c= avctx->thread_opaque;

248 c->func2 = func2;

249 return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);

250 }

251

252 static int avcodec_thread_init(AVCodecContext *avctx)

253 {

254 int i;

255 ThreadContext *c;

256 int thread_count = avctx->thread_count;

257

258 if (!thread_count) {

259 int nb_cpus = av_cpu_count();

260 if (avctx->height)

261 nb_cpus = FFMIN(nb_cpus, (avctx->height+15)/16);

262 // use number of cores + 1 as thread count if there is more than one

263 if (nb_cpus > 1)

264 thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);

265 else

266 thread_count = avctx->thread_count = 1;

267 }

268

269 if (thread_count <= 1) {

270 avctx->active_thread_type = 0;

271 return 0;

272 }

273

274 c = av_mallocz(sizeof(ThreadContext));

275 if (!c)

276 return -1;

277

278 c->workers = av_mallocz(sizeof(pthread_t)*thread_count);

279 if (!c->workers) {

280 av_free(c);

281 return -1;

282 }

283

284 avctx->thread_opaque = c;

285 c->current_job = 0;

286 c->job_count = 0;

287 c->job_size = 0;

288 c->done = 0;

289 pthread_cond_init(&c->current_job_cond, NULL);

290 pthread_cond_init(&c->last_job_cond, NULL);

291 pthread_mutex_init(&c->current_job_lock, NULL);

292 pthread_mutex_lock(&c->current_job_lock);

293 for (i=0; i<thread_count; i++) {

294 if(pthread_create(&c->workers[i], NULL, worker, avctx)) {

295 avctx->thread_count = i;

296 pthread_mutex_unlock(&c->current_job_lock);

297 ff_thread_free(avctx);

298 return -1;

299 }

300 }

301

302 avcodec_thread_park_workers(c, thread_count);

303

304 avctx->execute = avcodec_thread_execute;

305 avctx->execute2 = avcodec_thread_execute2;

306 return 0;

307 }

308

309 #define THREAD_SAFE_CALLBACKS(avctx) \

310 ((avctx)->thread_safe_callbacks || (!(avctx)->get_buffer && (avctx)->get_buffer2 == avcodec_default_get_buffer2))

311

312 /**

313 * Codec worker thread.

314 *

315 * Automatically calls ff_thread_finish_setup() if the codec does

316 * not provide an update_thread_context method, or if the codec returns

317 * before calling it.

318 */

319 static attribute_align_arg void *frame_worker_thread(void *arg)

320 {

321 PerThreadContext *p = arg;

322 FrameThreadContext *fctx = p->parent;

323 AVCodecContext *avctx = p->avctx;

324 const AVCodec *codec = avctx->codec;

325

326 pthread_mutex_lock(&p->mutex);

327 while (1) {

328 while (p->state == STATE_INPUT_READY && !fctx->die)

329 pthread_cond_wait(&p->input_cond, &p->mutex);

330

331 if (fctx->die) break;

332

333 if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))

334 ff_thread_finish_setup(avctx);

335

336 avcodec_get_frame_defaults(&p->frame);

337 p->got_frame = 0;

338 p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);

339

340 /* many decoders assign whole AVFrames, thus overwriting extended_data;

341 * make sure it's set correctly */

342 p->frame.extended_data = p->frame.data;

343

344 if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);

345

346 pthread_mutex_lock(&p->progress_mutex);

347 #if 0 //BUFREF-FIXME

348 for (i = 0; i < MAX_BUFFERS; i++)

349 if (p->progress_used[i] && (p->got_frame || p->result<0 || avctx->codec_id != AV_CODEC_ID_H264)) {

350 p->progress[i][0] = INT_MAX;

351 p->progress[i][1] = INT_MAX;

352 }

353 #endif

354 p->state = STATE_INPUT_READY;

355

356 pthread_cond_broadcast(&p->progress_cond);

357 pthread_cond_signal(&p->output_cond);

358 pthread_mutex_unlock(&p->progress_mutex);

359 }

360 pthread_mutex_unlock(&p->mutex);

361

362 return NULL;

363 }

364

365 /**

366 * Update the next thread's AVCodecContext with values from the reference thread's context.

367 *

368 * @param dst The destination context.

369 * @param src The source context.

370 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread

371 */

372 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)

373 {

374 int err = 0;

375

376 if (dst != src) {

377 dst->time_base = src->time_base;

378 dst->width = src->width;

379 dst->height = src->height;

380 dst->pix_fmt = src->pix_fmt;

381

382 dst->coded_width = src->coded_width;

383 dst->coded_height = src->coded_height;

384

385 dst->has_b_frames = src->has_b_frames;

386 dst->idct_algo = src->idct_algo;

387

388 dst->bits_per_coded_sample = src->bits_per_coded_sample;

389 dst->sample_aspect_ratio = src->sample_aspect_ratio;

390 dst->dtg_active_format = src->dtg_active_format;

391

392 dst->profile = src->profile;

393 dst->level = src->level;

394

395 dst->bits_per_raw_sample = src->bits_per_raw_sample;

396 dst->ticks_per_frame = src->ticks_per_frame;

397 dst->color_primaries = src->color_primaries;

398

399 dst->color_trc = src->color_trc;

400 dst->colorspace = src->colorspace;

401 dst->color_range = src->color_range;

402 dst->chroma_sample_location = src->chroma_sample_location;

403

404 dst->hwaccel = src->hwaccel;

405 dst->hwaccel_context = src->hwaccel_context;

406

407 dst->channels = src->channels;

408 dst->sample_rate = src->sample_rate;

409 dst->sample_fmt = src->sample_fmt;

410 dst->channel_layout = src->channel_layout;

411 }

412

413 if (for_user) {

414 dst->delay = src->thread_count - 1;

415 dst->coded_frame = src->coded_frame;

416 } else {

417 if (dst->codec->update_thread_context)

418 err = dst->codec->update_thread_context(dst, src);

419 }

420

421 return err;

422 }

423

424 /**

425 * Update the next thread's AVCodecContext with values set by the user.

426 *

427 * @param dst The destination context.

428 * @param src The source context.

429 * @return 0 on success, negative error code on failure

430 */

431 static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)

432 {

433 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);

434 dst->flags = src->flags;

435

436 dst->draw_horiz_band= src->draw_horiz_band;

437 dst->get_buffer2 = src->get_buffer2;

438 #if FF_API_GET_BUFFER

439 dst->get_buffer = src->get_buffer;

440 dst->release_buffer = src->release_buffer;

441 #endif

442

443 dst->opaque = src->opaque;

444 dst->debug = src->debug;

445 dst->debug_mv = src->debug_mv;

446

447 dst->slice_flags = src->slice_flags;

448 dst->flags2 = src->flags2;

449

450 copy_fields(skip_loop_filter, subtitle_header);

451

452 dst->frame_number = src->frame_number;

453 dst->reordered_opaque = src->reordered_opaque;

454 dst->thread_safe_callbacks = src->thread_safe_callbacks;

455

456 if (src->slice_count && src->slice_offset) {

457 if (dst->slice_count < src->slice_count) {

458 int *tmp = av_realloc(dst->slice_offset, src->slice_count *

459 sizeof(*dst->slice_offset));

460 if (!tmp) {

461 av_free(dst->slice_offset);

462 return AVERROR(ENOMEM);

463 }

464 dst->slice_offset = tmp;

465 }

466 memcpy(dst->slice_offset, src->slice_offset,

467 src->slice_count * sizeof(*dst->slice_offset));

468 }

469 dst->slice_count = src->slice_count;

470 return 0;

471 #undef copy_fields

472 }

473

474 /// Releases the buffers that this decoding thread was the last user of.

475 static void release_delayed_buffers(PerThreadContext *p)

476 {

477 FrameThreadContext *fctx = p->parent;

478

479 while (p->num_released_buffers > 0) {

480 AVFrame *f;

481

482 pthread_mutex_lock(&fctx->buffer_mutex);

483

484 // fix extended data in case the caller screwed it up

485 av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO ||

486 p->avctx->codec_type == AVMEDIA_TYPE_AUDIO);

487 f = &p->released_buffers[--p->num_released_buffers];

488 f->extended_data = f->data;

489 av_frame_unref(f);

490

491 pthread_mutex_unlock(&fctx->buffer_mutex);

492 }

493 }

494

495 static int submit_packet(PerThreadContext *p, AVPacket *avpkt)

496 {

497 FrameThreadContext *fctx = p->parent;

498 PerThreadContext *prev_thread = fctx->prev_thread;

499 const AVCodec *codec = p->avctx->codec;

500

501 if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;

502

503 pthread_mutex_lock(&p->mutex);

504

505 release_delayed_buffers(p);

506

507 if (prev_thread) {

508 int err;

509 if (prev_thread->state == STATE_SETTING_UP) {

510 pthread_mutex_lock(&prev_thread->progress_mutex);

511 while (prev_thread->state == STATE_SETTING_UP)

512 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);

513 pthread_mutex_unlock(&prev_thread->progress_mutex);

514 }

515

516 err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);

517 if (err) {

518 pthread_mutex_unlock(&p->mutex);

519 return err;

520 }

521 }

522

523 av_buffer_unref(&p->avpkt.buf);

524 p->avpkt = *avpkt;

525 if (avpkt->buf)

526 p->avpkt.buf = av_buffer_ref(avpkt->buf);

527 else {

528 av_fast_malloc(&p->buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);

529 p->avpkt.data = p->buf;

530 memcpy(p->buf, avpkt->data, avpkt->size);

531 memset(p->buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

532 }

533

534 p->state = STATE_SETTING_UP;

535 pthread_cond_signal(&p->input_cond);

536 pthread_mutex_unlock(&p->mutex);

537

538 /*

539 * If the client doesn't have a thread-safe get_buffer(),

540 * then decoding threads call back to the main thread,

541 * and it calls back to the client here.

542 */

543

544 if (!p->avctx->thread_safe_callbacks && (

545 p->avctx->get_format != avcodec_default_get_format ||

546 #if FF_API_GET_BUFFER

547 p->avctx->get_buffer ||

548 #endif

549 p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {

550 while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {

551 int call_done = 1;

552 pthread_mutex_lock(&p->progress_mutex);

553 while (p->state == STATE_SETTING_UP)

554 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);

555

556 switch (p->state) {

557 case STATE_GET_BUFFER:

558 p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);

559 break;

560 case STATE_GET_FORMAT:

561 p->result_format = p->avctx->get_format(p->avctx, p->available_formats);

562 break;

563 default:

564 call_done = 0;

565 break;

566 }

567 if (call_done) {

568 p->state = STATE_SETTING_UP;

569 pthread_cond_signal(&p->progress_cond);

570 }

571 pthread_mutex_unlock(&p->progress_mutex);

572 }

573 }

574

575 fctx->prev_thread = p;

576 fctx->next_decoding++;

577

578 return 0;

579 }

580

581 int ff_thread_decode_frame(AVCodecContext *avctx,

582 AVFrame *picture, int *got_picture_ptr,

583 AVPacket *avpkt)

584 {

585 FrameThreadContext *fctx = avctx->thread_opaque;

586 int finished = fctx->next_finished;

587 PerThreadContext *p;

588 int err;

589

590 /*

591 * Submit a packet to the next decoding thread.

592 */

593

594 p = &fctx->threads[fctx->next_decoding];

595 err = update_context_from_user(p->avctx, avctx);

596 if (err) return err;

597 err = submit_packet(p, avpkt);

598 if (err) return err;

599

600 /*

601 * If we're still receiving the initial packets, don't return a frame.

602 */

603

604 if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))

605 fctx->delaying = 0;

606

607 if (fctx->delaying) {

608 *got_picture_ptr=0;

609 if (avpkt->size)

610 return avpkt->size;

611 }

612

613 /*

614 * Return the next available frame from the oldest thread.

615 * If we're at the end of the stream, then we have to skip threads that

616 * didn't output a frame, because we don't want to accidentally signal

617 * EOF (avpkt->size == 0 && *got_picture_ptr == 0).

618 */

619

620 do {

621 p = &fctx->threads[finished++];

622

623 if (p->state != STATE_INPUT_READY) {

624 pthread_mutex_lock(&p->progress_mutex);

625 while (p->state != STATE_INPUT_READY)

626 pthread_cond_wait(&p->output_cond, &p->progress_mutex);

627 pthread_mutex_unlock(&p->progress_mutex);

628 }

629

630 av_frame_move_ref(picture, &p->frame);

631 *got_picture_ptr = p->got_frame;

632 picture->pkt_dts = p->avpkt.dts;

633

634 /*

635 * A later call with avkpt->size == 0 may loop over all threads,

636 * including this one, searching for a frame to return before being

637 * stopped by the "finished != fctx->next_finished" condition.

638 * Make sure we don't mistakenly return the same frame again.

639 */

640 p->got_frame = 0;

641

642 if (finished >= avctx->thread_count) finished = 0;

643 } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);

644

645 update_context_from_thread(avctx, p->avctx, 1);

646

647 if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;

648

649 fctx->next_finished = finished;

650

651 /* return the size of the consumed packet if no error occurred */

652 return (p->result >= 0) ? avpkt->size : p->result;

653 }

654

655 void ff_thread_report_progress(ThreadFrame *f, int n, int field)

656 {

657 PerThreadContext *p;

658 volatile int *progress = f->progress ? (int*)f->progress->data : NULL;

659

660 if (!progress || progress[field] >= n) return;

661

662 p = f->owner->thread_opaque;

663

664 if (f->owner->debug&FF_DEBUG_THREADS)

665 av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);

666

667 pthread_mutex_lock(&p->progress_mutex);

668 progress[field] = n;

669 pthread_cond_broadcast(&p->progress_cond);

670 pthread_mutex_unlock(&p->progress_mutex);

671 }

672

673 void ff_thread_await_progress(ThreadFrame *f, int n, int field)

674 {

675 PerThreadContext *p;

676 volatile int *progress = f->progress ? (int*)f->progress->data : NULL;

677

678 if (!progress || progress[field] >= n) return;

679

680 p = f->owner->thread_opaque;

681

682 if (f->owner->debug&FF_DEBUG_THREADS)

683 av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);

684

685 pthread_mutex_lock(&p->progress_mutex);

686 while (progress[field] < n)

687 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);

688 pthread_mutex_unlock(&p->progress_mutex);

689 }

690

691 void ff_thread_finish_setup(AVCodecContext *avctx) {

692 PerThreadContext *p = avctx->thread_opaque;

693

694 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;

695

696 if(p->state == STATE_SETUP_FINISHED){

697 av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");

698 }

699

700 pthread_mutex_lock(&p->progress_mutex);

701 p->state = STATE_SETUP_FINISHED;

702 pthread_cond_broadcast(&p->progress_cond);

703 pthread_mutex_unlock(&p->progress_mutex);

704 }

705

706 /// Waits for all threads to finish.

707 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)

708 {

709 int i;

710

711 for (i = 0; i < thread_count; i++) {

712 PerThreadContext *p = &fctx->threads[i];

713

714 if (p->state != STATE_INPUT_READY) {

715 pthread_mutex_lock(&p->progress_mutex);

716 while (p->state != STATE_INPUT_READY)

717 pthread_cond_wait(&p->output_cond, &p->progress_mutex);

718 pthread_mutex_unlock(&p->progress_mutex);

719 }

720 p->got_frame = 0;

721 }

722 }

723

724 static void frame_thread_free(AVCodecContext *avctx, int thread_count)

725 {

726 FrameThreadContext *fctx = avctx->thread_opaque;

727 const AVCodec *codec = avctx->codec;

728 int i;

729

730 park_frame_worker_threads(fctx, thread_count);

731

732 if (fctx->prev_thread && fctx->prev_thread != fctx->threads)

733 if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {

734 av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");

735 fctx->prev_thread->avctx->internal->is_copy = fctx->threads->avctx->internal->is_copy;

736 fctx->threads->avctx->internal->is_copy = 1;

737 }

738

739 fctx->die = 1;

740

741 for (i = 0; i < thread_count; i++) {

742 PerThreadContext *p = &fctx->threads[i];

743

744 pthread_mutex_lock(&p->mutex);

745 pthread_cond_signal(&p->input_cond);

746 pthread_mutex_unlock(&p->mutex);

747

748 if (p->thread_init)

749 pthread_join(p->thread, NULL);

750 p->thread_init=0;

751

752 if (codec->close)

753 codec->close(p->avctx);

754

755 avctx->codec = NULL;

756

757 release_delayed_buffers(p);

758 av_frame_unref(&p->frame);

759 }

760

761 for (i = 0; i < thread_count; i++) {

762 PerThreadContext *p = &fctx->threads[i];

763

764 pthread_mutex_destroy(&p->mutex);

765 pthread_mutex_destroy(&p->progress_mutex);

766 pthread_cond_destroy(&p->input_cond);

767 pthread_cond_destroy(&p->progress_cond);

768 pthread_cond_destroy(&p->output_cond);

769 av_buffer_unref(&p->avpkt.buf);

770 av_freep(&p->buf);

771 av_freep(&p->released_buffers);

772

773 if (i) {

774 av_freep(&p->avctx->priv_data);

775 av_freep(&p->avctx->internal);

776 av_freep(&p->avctx->slice_offset);

777 }

778

779 av_freep(&p->avctx);

780 }

781

782 av_freep(&fctx->threads);

783 pthread_mutex_destroy(&fctx->buffer_mutex);

784 av_freep(&avctx->thread_opaque);

785 }

786

787 static int frame_thread_init(AVCodecContext *avctx)

788 {

789 int thread_count = avctx->thread_count;

790 const AVCodec *codec = avctx->codec;

791 AVCodecContext *src = avctx;

792 FrameThreadContext *fctx;

793 int i, err = 0;

794

795 if (!thread_count) {

796 int nb_cpus = av_cpu_count();

797 if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)

798 nb_cpus = 1;

799 // use number of cores + 1 as thread count if there is more than one

800 if (nb_cpus > 1)

801 thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);

802 else

803 thread_count = avctx->thread_count = 1;

804 }

805

806 if (thread_count <= 1) {

807 avctx->active_thread_type = 0;

808 return 0;

809 }

810

811 avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));

812

813 fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);

814 pthread_mutex_init(&fctx->buffer_mutex, NULL);

815 fctx->delaying = 1;

816

817 for (i = 0; i < thread_count; i++) {

818 AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));

819 PerThreadContext *p = &fctx->threads[i];

820

821 pthread_mutex_init(&p->mutex, NULL);

822 pthread_mutex_init(&p->progress_mutex, NULL);

823 pthread_cond_init(&p->input_cond, NULL);

824 pthread_cond_init(&p->progress_cond, NULL);

825 pthread_cond_init(&p->output_cond, NULL);

826

827 p->parent = fctx;

828 p->avctx = copy;

829

830 if (!copy) {

831 err = AVERROR(ENOMEM);

832 goto error;

833 }

834

835 *copy = *src;

836 copy->thread_opaque = p;

837 copy->pkt = &p->avpkt;

838

839 if (!i) {

840 src = copy;

841

842 if (codec->init)

843 err = codec->init(copy);

844

845 update_context_from_thread(avctx, copy, 1);

846 } else {

847 copy->priv_data = av_malloc(codec->priv_data_size);

848 if (!copy->priv_data) {

849 err = AVERROR(ENOMEM);

850 goto error;

851 }

852 memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);

853 copy->internal = av_malloc(sizeof(AVCodecInternal));

854 if (!copy->internal) {

855 err = AVERROR(ENOMEM);

856 goto error;

857 }

858 *copy->internal = *src->internal;

859 copy->internal->is_copy = 1;

860

861 if (codec->init_thread_copy)

862 err = codec->init_thread_copy(copy);

863 }

864

865 if (err) goto error;

866

867 err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));

868 p->thread_init= !err;

869 if(!p->thread_init)

870 goto error;

871 }

872

873 return 0;

874

875 error:

876 frame_thread_free(avctx, i+1);

877

878 return err;

879 }

880

881 void ff_thread_flush(AVCodecContext *avctx)

882 {

883 int i;

884 FrameThreadContext *fctx = avctx->thread_opaque;

885

886 if (!avctx->thread_opaque) return;

887

888 park_frame_worker_threads(fctx, avctx->thread_count);

889 if (fctx->prev_thread) {

890 if (fctx->prev_thread != &fctx->threads[0])

891 update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);

892 if (avctx->codec->flush)

893 avctx->codec->flush(fctx->threads[0].avctx);

894 }

895

896 fctx->next_decoding = fctx->next_finished = 0;

897 fctx->delaying = 1;

898 fctx->prev_thread = NULL;

899 for (i = 0; i < avctx->thread_count; i++) {

900 PerThreadContext *p = &fctx->threads[i];

901 // Make sure decode flush calls with size=0 won't return old frames

902 p->got_frame = 0;

903 av_frame_unref(&p->frame);

904

905 release_delayed_buffers(p);

906 }

907 }

908

909 int ff_thread_can_start_frame(AVCodecContext *avctx)

910 {

911 PerThreadContext *p = avctx->thread_opaque;

912 if ((avctx->active_thread_type&FF_THREAD_FRAME) && p->state != STATE_SETTING_UP &&

913 (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {

914 return 0;

915 }

916 return 1;

917 }

918

919 static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int flags)

920 {

921 PerThreadContext *p = avctx->thread_opaque;

922 int err;

923

924 f->owner = avctx;

925

926 ff_init_buffer_info(avctx, f->f);

927

928 if (!(avctx->active_thread_type & FF_THREAD_FRAME))

929 return ff_get_buffer(avctx, f->f, flags);

930

931 if (p->state != STATE_SETTING_UP &&

932 (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {

933 av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");

934 return -1;

935 }

936

937 if (avctx->internal->allocate_progress) {

938 int *progress;

939 f->progress = av_buffer_alloc(2 * sizeof(int));

940 if (!f->progress) {

941 return AVERROR(ENOMEM);

942 }

943 progress = (int*)f->progress->data;

944

945 progress[0] = progress[1] = -1;

946 }

947

948 pthread_mutex_lock(&p->parent->buffer_mutex);

949

950 if (avctx->thread_safe_callbacks || (

951 #if FF_API_GET_BUFFER

952 !avctx->get_buffer &&

953 #endif

954 avctx->get_buffer2 == avcodec_default_get_buffer2)) {

955 err = ff_get_buffer(avctx, f->f, flags);

956 } else {

957 pthread_mutex_lock(&p->progress_mutex);

958 p->requested_frame = f->f;

959 p->requested_flags = flags;

960 p->state = STATE_GET_BUFFER;

961 pthread_cond_broadcast(&p->progress_cond);

962

963 while (p->state != STATE_SETTING_UP)

964 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);

965

966 err = p->result;

967

968 pthread_mutex_unlock(&p->progress_mutex);

969

970 }

971 if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)

972 ff_thread_finish_setup(avctx);

973

974 if (err)

975 av_buffer_unref(&f->progress);

976

977 pthread_mutex_unlock(&p->parent->buffer_mutex);

978

979 return err;

980 }

981

982 enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)

983 {

984 enum AVPixelFormat res;

985 PerThreadContext *p = avctx->thread_opaque;

986 if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||

987 avctx->get_format == avcodec_default_get_format)

988 return avctx->get_format(avctx, fmt);

989 if (p->state != STATE_SETTING_UP) {

990 av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");

991 return -1;

992 }

993 pthread_mutex_lock(&p->progress_mutex);

994 p->available_formats = fmt;

995 p->state = STATE_GET_FORMAT;

996 pthread_cond_broadcast(&p->progress_cond);

997

998 while (p->state != STATE_SETTING_UP)

999 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);

1000

1001 res = p->result_format;

1002

1003 pthread_mutex_unlock(&p->progress_mutex);

1004

1005 return res;

1006 }

1007

1008 int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)

1009 {

1010 int ret = thread_get_buffer_internal(avctx, f, flags);

1011 if (ret < 0)

1012 av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");

1013 return ret;

1014 }

1015

1016 void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)

1017 {

1018 PerThreadContext *p = avctx->thread_opaque;

1019 FrameThreadContext *fctx;

1020 AVFrame *dst, *tmp;

1021 int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||

1022 avctx->thread_safe_callbacks ||

1023 (

1024 #if FF_API_GET_BUFFER

1025 !avctx->get_buffer &&

1026 #endif

1027 avctx->get_buffer2 == avcodec_default_get_buffer2);

1028

1029 if (!f->f->data[0])

1030 return;

1031

1032 if (avctx->debug & FF_DEBUG_BUFFERS)

1033 av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);

1034

1035 av_buffer_unref(&f->progress);

1036 f->owner = NULL;

1037

1038 if (can_direct_free) {

1039 av_frame_unref(f->f);

1040 return;

1041 }

1042

1043 fctx = p->parent;

1044 pthread_mutex_lock(&fctx->buffer_mutex);

1045

1046 if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))

1047 goto fail;

1048 tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,

1049 (p->num_released_buffers + 1) *

1050 sizeof(*p->released_buffers));

1051 if (!tmp)

1052 goto fail;

1053 p->released_buffers = tmp;

1054

1055 dst = &p->released_buffers[p->num_released_buffers];

1056 av_frame_move_ref(dst, f->f);

1057

1058 p->num_released_buffers++;

1059

1060 fail:

1061 pthread_mutex_unlock(&fctx->buffer_mutex);

1062 }

1063

1064 /**

1065 * Set the threading algorithms used.

1066 *

1067 * Threading requires more than one thread.

1068 * Frame threading requires entire frames to be passed to the codec,

1069 * and introduces extra decoding delay, so is incompatible with low_delay.

1070 *

1071 * @param avctx The context.

1072 */

1073 static void validate_thread_parameters(AVCodecContext *avctx)

1074 {

1075 int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)

1076 && !(avctx->flags & CODEC_FLAG_TRUNCATED)

1077 && !(avctx->flags & CODEC_FLAG_LOW_DELAY)

1078 && !(avctx->flags2 & CODEC_FLAG2_CHUNKS);

1079 if (avctx->thread_count == 1) {

1080 avctx->active_thread_type = 0;

1081 } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {

1082 avctx->active_thread_type = FF_THREAD_FRAME;

1083 } else if (avctx->codec->capabilities & CODEC_CAP_SLICE_THREADS &&

1084 avctx->thread_type & FF_THREAD_SLICE) {

1085 avctx->active_thread_type = FF_THREAD_SLICE;

1086 } else if (!(avctx->codec->capabilities & CODEC_CAP_AUTO_THREADS)) {

1087 avctx->thread_count = 1;

1088 avctx->active_thread_type = 0;

1089 }

1090

1091 if (avctx->thread_count > MAX_AUTO_THREADS)

1092 av_log(avctx, AV_LOG_WARNING,

1093 "Application has requested %d threads. Using a thread count greater than %d is not recommended.\n",

1094 avctx->thread_count, MAX_AUTO_THREADS);

1095 }

1096

1097 int ff_thread_init(AVCodecContext *avctx)

1098 {

1099 #if HAVE_W32THREADS

1100 w32thread_init();

1101 #endif

1102

1103 validate_thread_parameters(avctx);

1104

1105 if (avctx->active_thread_type&FF_THREAD_SLICE)

1106 return avcodec_thread_init(avctx);

1107 else if (avctx->active_thread_type&FF_THREAD_FRAME)

1108 return frame_thread_init(avctx);

1109

1110 return 0;

1111 }

1112

1113 void ff_thread_free(AVCodecContext *avctx)

1114 {

1115 if (avctx->active_thread_type&FF_THREAD_FRAME)

1116 frame_thread_free(avctx, avctx->thread_count);

1117 else

1118 thread_free(avctx);

1119 }

Generated on Wed Jul 10 2013 23:48:03 for FFmpeg by doxygen 1.8.2