ffmpeg/libavcodec/pthread_frame.c

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 /**
  20  * @file
  21  * Frame multithreading support functions
  22  * @see doc/multithreading.txt
  23  */
  24
  25 #include "config.h"
  26
  27 #include <stdint.h>
  28
  29 #if HAVE_PTHREADS
  30 #include <pthread.h>
  31 #elif HAVE_W32THREADS
  32 #include "compat/w32pthreads.h"
  33 #elif HAVE_OS2THREADS
  34 #include "compat/os2threads.h"
  35 #endif
  36
  37 #include "avcodec.h"
  38 #include "internal.h"
  39 #include "pthread_internal.h"
  40 #include "thread.h"
  41 #include "version.h"
  42
  43 #include "libavutil/avassert.h"
  44 #include "libavutil/buffer.h"
  45 #include "libavutil/common.h"
  46 #include "libavutil/cpu.h"
  47 #include "libavutil/frame.h"
  48 #include "libavutil/internal.h"
  49 #include "libavutil/log.h"
  50 #include "libavutil/mem.h"
  51
  52 /**
  53  * Context used by codec threads and stored in their AVCodecInternal thread_ctx.
  54  */
  55 typedef struct PerThreadContext {
  56     struct FrameThreadContext *parent;
  57
  58     pthread_t      thread;
  59     int            thread_init;
  60     pthread_cond_t input_cond;      ///< Used to wait for a new packet from the main thread.
  61     pthread_cond_t progress_cond;   ///< Used by child threads to wait for progress to change.
  62     pthread_cond_t output_cond;     ///< Used by the main thread to wait for frames to finish.
  63
  64     pthread_mutex_t mutex;          ///< Mutex used to protect the contents of the PerThreadContext.
  65     pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
  66
  67     AVCodecContext *avctx;          ///< Context used to decode packets passed to this thread.
  68
  69     AVPacket       avpkt;           ///< Input packet (for decoding) or output (for encoding).
  70
  71     AVFrame *frame;                 ///< Output frame (for decoding) or input (for encoding).
  72     int     got_frame;              ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
  73     int     result;                 ///< The result of the last codec decode/encode() call.
  74
  75     enum {
  76         STATE_INPUT_READY,          ///< Set when the thread is awaiting a packet.
  77         STATE_SETTING_UP,           ///< Set before the codec has called ff_thread_finish_setup().
  78         STATE_GET_BUFFER,           /**<
  79                                      * Set when the codec calls get_buffer().
  80                                      * State is returned to STATE_SETTING_UP afterwards.
  81                                      */
  82         STATE_GET_FORMAT,           /**<
  83                                      * Set when the codec calls get_format().
  84                                      * State is returned to STATE_SETTING_UP afterwards.
  85                                      */
  86         STATE_SETUP_FINISHED        ///< Set after the codec has called ff_thread_finish_setup().
  87     } state;
  88
  89     /**
  90      * Array of frames passed to ff_thread_release_buffer().
  91      * Frames are released after all threads referencing them are finished.
  92      */
  93     AVFrame *released_buffers;
  94     int  num_released_buffers;
  95     int      released_buffers_allocated;
  96
  97     AVFrame *requested_frame;       ///< AVFrame the codec passed to get_buffer()
  98     int      requested_flags;       ///< flags passed to get_buffer() for requested_frame
  99
 100     const enum AVPixelFormat *available_formats; ///< Format array for get_format()
 101     enum AVPixelFormat result_format;            ///< get_format() result
 102 } PerThreadContext;
 103
 104 /**
 105  * Context stored in the client AVCodecInternal thread_ctx.
 106  */
 107 typedef struct FrameThreadContext {
 108     PerThreadContext *threads;     ///< The contexts for each thread.
 109     PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
 110
 111     pthread_mutex_t buffer_mutex;  ///< Mutex used to protect get/release_buffer().
 112
 113     int next_decoding;             ///< The next context to submit a packet to.
 114     int next_finished;             ///< The next context to return output from.
 115
 116     int delaying;                  /**<
 117                                     * Set for the first N packets, where N is the number of threads.
 118                                     * While it is set, ff_thread_en/decode_frame won't return any results.
 119                                     */
 120
 121     int die;                       ///< Set when threads should exit.
 122 } FrameThreadContext;
 123
 124 #if FF_API_GET_BUFFER
 125 #define THREAD_SAFE_CALLBACKS(avctx) \
 126 ((avctx)->thread_safe_callbacks || (!(avctx)->get_buffer && (avctx)->get_buffer2 == avcodec_default_get_buffer2))
 127 #else
 128 #define THREAD_SAFE_CALLBACKS(avctx) \
 129 ((avctx)->thread_safe_callbacks || (avctx)->get_buffer2 == avcodec_default_get_buffer2)
 130 #endif
 131
 132 /**
 133  * Codec worker thread.
 134  *
 135  * Automatically calls ff_thread_finish_setup() if the codec does
 136  * not provide an update_thread_context method, or if the codec returns
 137  * before calling it.
 138  */
 139 static attribute_align_arg void *frame_worker_thread(void *arg)
 140 {
 141     PerThreadContext *p = arg;
 142     FrameThreadContext *fctx = p->parent;
 143     AVCodecContext *avctx = p->avctx;
 144     const AVCodec *codec = avctx->codec;
 145
 146     pthread_mutex_lock(&p->mutex);
 147     while (1) {
 148             while (p->state == STATE_INPUT_READY && !fctx->die)
 149                 pthread_cond_wait(&p->input_cond, &p->mutex);
 150
 151         if (fctx->die) break;
 152
 153         if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
 154             ff_thread_finish_setup(avctx);
 155
 156         av_frame_unref(p->frame);
 157         p->got_frame = 0;
 158         p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
 159
 160         if ((p->result < 0 || !p->got_frame) && p->frame->buf[0]) {
 161             if (avctx->internal->allocate_progress)
 162                 av_log(avctx, AV_LOG_ERROR, "A frame threaded decoder did not "
 163                        "free the frame on failure. This is a bug, please report it.\n");
 164             av_frame_unref(p->frame);
 165         }
 166
 167         if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
 168
 169         pthread_mutex_lock(&p->progress_mutex);
 170 #if 0 //BUFREF-FIXME
 171         for (i = 0; i < MAX_BUFFERS; i++)
 172             if (p->progress_used[i] && (p->got_frame || p->result<0 || avctx->codec_id != AV_CODEC_ID_H264)) {
 173                 p->progress[i][0] = INT_MAX;
 174                 p->progress[i][1] = INT_MAX;
 175             }
 176 #endif
 177         p->state = STATE_INPUT_READY;
 178
 179         pthread_cond_broadcast(&p->progress_cond);
 180         pthread_cond_signal(&p->output_cond);
 181         pthread_mutex_unlock(&p->progress_mutex);
 182     }
 183     pthread_mutex_unlock(&p->mutex);
 184
 185     return NULL;
 186 }
 187
 188 /**
 189  * Update the next thread's AVCodecContext with values from the reference thread's context.
 190  *
 191  * @param dst The destination context.
 192  * @param src The source context.
 193  * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
 194  */
 195 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
 196 {
 197     int err = 0;
 198
 199     if (dst != src) {
 200         dst->time_base = src->time_base;
 201         dst->framerate = src->framerate;
 202         dst->width     = src->width;
 203         dst->height    = src->height;
 204         dst->pix_fmt   = src->pix_fmt;
 205
 206         dst->coded_width  = src->coded_width;
 207         dst->coded_height = src->coded_height;
 208
 209         dst->has_b_frames = src->has_b_frames;
 210         dst->idct_algo    = src->idct_algo;
 211
 212         dst->bits_per_coded_sample = src->bits_per_coded_sample;
 213         dst->sample_aspect_ratio   = src->sample_aspect_ratio;
 214 #if FF_API_AFD
 215 FF_DISABLE_DEPRECATION_WARNINGS
 216         dst->dtg_active_format     = src->dtg_active_format;
 217 FF_ENABLE_DEPRECATION_WARNINGS
 218 #endif /* FF_API_AFD */
 219
 220         dst->profile = src->profile;
 221         dst->level   = src->level;
 222
 223         dst->bits_per_raw_sample = src->bits_per_raw_sample;
 224         dst->ticks_per_frame     = src->ticks_per_frame;
 225         dst->color_primaries     = src->color_primaries;
 226
 227         dst->color_trc   = src->color_trc;
 228         dst->colorspace  = src->colorspace;
 229         dst->color_range = src->color_range;
 230         dst->chroma_sample_location = src->chroma_sample_location;
 231
 232         dst->hwaccel = src->hwaccel;
 233         dst->hwaccel_context = src->hwaccel_context;
 234
 235         dst->channels       = src->channels;
 236         dst->sample_rate    = src->sample_rate;
 237         dst->sample_fmt     = src->sample_fmt;
 238         dst->channel_layout = src->channel_layout;
 239         dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
 240     }
 241
 242     if (for_user) {
 243         dst->delay       = src->thread_count - 1;
 244         dst->coded_frame = src->coded_frame;
 245     } else {
 246         if (dst->codec->update_thread_context)
 247             err = dst->codec->update_thread_context(dst, src);
 248     }
 249
 250     return err;
 251 }
 252
 253 /**
 254  * Update the next thread's AVCodecContext with values set by the user.
 255  *
 256  * @param dst The destination context.
 257  * @param src The source context.
 258  * @return 0 on success, negative error code on failure
 259  */
 260 static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
 261 {
 262 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
 263     dst->flags          = src->flags;
 264
 265     dst->draw_horiz_band= src->draw_horiz_band;
 266     dst->get_buffer2    = src->get_buffer2;
 267 #if FF_API_GET_BUFFER
 268 FF_DISABLE_DEPRECATION_WARNINGS
 269     dst->get_buffer     = src->get_buffer;
 270     dst->release_buffer = src->release_buffer;
 271 FF_ENABLE_DEPRECATION_WARNINGS
 272 #endif
 273
 274     dst->opaque   = src->opaque;
 275     dst->debug    = src->debug;
 276     dst->debug_mv = src->debug_mv;
 277
 278     dst->slice_flags = src->slice_flags;
 279     dst->flags2      = src->flags2;
 280
 281     copy_fields(skip_loop_filter, subtitle_header);
 282
 283     dst->frame_number     = src->frame_number;
 284     dst->reordered_opaque = src->reordered_opaque;
 285     dst->thread_safe_callbacks = src->thread_safe_callbacks;
 286
 287     if (src->slice_count && src->slice_offset) {
 288         if (dst->slice_count < src->slice_count) {
 289             int err = av_reallocp_array(&dst->slice_offset, src->slice_count,
 290                                         sizeof(*dst->slice_offset));
 291             if (err < 0)
 292                 return err;
 293         }
 294         memcpy(dst->slice_offset, src->slice_offset,
 295                src->slice_count * sizeof(*dst->slice_offset));
 296     }
 297     dst->slice_count = src->slice_count;
 298     return 0;
 299 #undef copy_fields
 300 }
 301
 302 /// Releases the buffers that this decoding thread was the last user of.
 303 static void release_delayed_buffers(PerThreadContext *p)
 304 {
 305     FrameThreadContext *fctx = p->parent;
 306
 307     while (p->num_released_buffers > 0) {
 308         AVFrame *f;
 309
 310         pthread_mutex_lock(&fctx->buffer_mutex);
 311
 312         // fix extended data in case the caller screwed it up
 313         av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
 314                    p->avctx->codec_type == AVMEDIA_TYPE_AUDIO);
 315         f = &p->released_buffers[--p->num_released_buffers];
 316         f->extended_data = f->data;
 317         av_frame_unref(f);
 318
 319         pthread_mutex_unlock(&fctx->buffer_mutex);
 320     }
 321 }
 322
 323 static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
 324 {
 325     FrameThreadContext *fctx = p->parent;
 326     PerThreadContext *prev_thread = fctx->prev_thread;
 327     const AVCodec *codec = p->avctx->codec;
 328
 329     if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
 330
 331     pthread_mutex_lock(&p->mutex);
 332
 333     release_delayed_buffers(p);
 334
 335     if (prev_thread) {
 336         int err;
 337         if (prev_thread->state == STATE_SETTING_UP) {
 338             pthread_mutex_lock(&prev_thread->progress_mutex);
 339             while (prev_thread->state == STATE_SETTING_UP)
 340                 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
 341             pthread_mutex_unlock(&prev_thread->progress_mutex);
 342         }
 343
 344         err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
 345         if (err) {
 346             pthread_mutex_unlock(&p->mutex);
 347             return err;
 348         }
 349     }
 350
 351     av_packet_unref(&p->avpkt);
 352     av_packet_ref(&p->avpkt, avpkt);
 353
 354     p->state = STATE_SETTING_UP;
 355     pthread_cond_signal(&p->input_cond);
 356     pthread_mutex_unlock(&p->mutex);
 357
 358     /*
 359      * If the client doesn't have a thread-safe get_buffer(),
 360      * then decoding threads call back to the main thread,
 361      * and it calls back to the client here.
 362      */
 363
 364 FF_DISABLE_DEPRECATION_WARNINGS
 365     if (!p->avctx->thread_safe_callbacks && (
 366          p->avctx->get_format != avcodec_default_get_format ||
 367 #if FF_API_GET_BUFFER
 368          p->avctx->get_buffer ||
 369 #endif
 370          p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
 371 FF_ENABLE_DEPRECATION_WARNINGS
 372         while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
 373             int call_done = 1;
 374             pthread_mutex_lock(&p->progress_mutex);
 375             while (p->state == STATE_SETTING_UP)
 376                 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
 377
 378             switch (p->state) {
 379             case STATE_GET_BUFFER:
 380                 p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
 381                 break;
 382             case STATE_GET_FORMAT:
 383                 p->result_format = ff_get_format(p->avctx, p->available_formats);
 384                 break;
 385             default:
 386                 call_done = 0;
 387                 break;
 388             }
 389             if (call_done) {
 390                 p->state  = STATE_SETTING_UP;
 391                 pthread_cond_signal(&p->progress_cond);
 392             }
 393             pthread_mutex_unlock(&p->progress_mutex);
 394         }
 395     }
 396
 397     fctx->prev_thread = p;
 398     fctx->next_decoding++;
 399
 400     return 0;
 401 }
 402
 403 int ff_thread_decode_frame(AVCodecContext *avctx,
 404                            AVFrame *picture, int *got_picture_ptr,
 405                            AVPacket *avpkt)
 406 {
 407     FrameThreadContext *fctx = avctx->internal->thread_ctx;
 408     int finished = fctx->next_finished;
 409     PerThreadContext *p;
 410     int err;
 411
 412     /*
 413      * Submit a packet to the next decoding thread.
 414      */
 415
 416     p = &fctx->threads[fctx->next_decoding];
 417     err = update_context_from_user(p->avctx, avctx);
 418     if (err) return err;
 419     err = submit_packet(p, avpkt);
 420     if (err) return err;
 421
 422     /*
 423      * If we're still receiving the initial packets, don't return a frame.
 424      */
 425
 426     if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
 427         fctx->delaying = 0;
 428
 429     if (fctx->delaying) {
 430         *got_picture_ptr=0;
 431         if (avpkt->size)
 432             return avpkt->size;
 433     }
 434
 435     /*
 436      * Return the next available frame from the oldest thread.
 437      * If we're at the end of the stream, then we have to skip threads that
 438      * didn't output a frame, because we don't want to accidentally signal
 439      * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
 440      */
 441
 442     do {
 443         p = &fctx->threads[finished++];
 444
 445         if (p->state != STATE_INPUT_READY) {
 446             pthread_mutex_lock(&p->progress_mutex);
 447             while (p->state != STATE_INPUT_READY)
 448                 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
 449             pthread_mutex_unlock(&p->progress_mutex);
 450         }
 451
 452         av_frame_move_ref(picture, p->frame);
 453         *got_picture_ptr = p->got_frame;
 454         picture->pkt_dts = p->avpkt.dts;
 455
 456         /*
 457          * A later call with avkpt->size == 0 may loop over all threads,
 458          * including this one, searching for a frame to return before being
 459          * stopped by the "finished != fctx->next_finished" condition.
 460          * Make sure we don't mistakenly return the same frame again.
 461          */
 462         p->got_frame = 0;
 463
 464         if (finished >= avctx->thread_count) finished = 0;
 465     } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
 466
 467     update_context_from_thread(avctx, p->avctx, 1);
 468
 469     if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
 470
 471     fctx->next_finished = finished;
 472
 473     /* return the size of the consumed packet if no error occurred */
 474     return (p->result >= 0) ? avpkt->size : p->result;
 475 }
 476
 477 void ff_thread_report_progress(ThreadFrame *f, int n, int field)
 478 {
 479     PerThreadContext *p;
 480     volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
 481
 482     if (!progress || progress[field] >= n) return;
 483
 484     p = f->owner->internal->thread_ctx;
 485
 486     if (f->owner->debug&FF_DEBUG_THREADS)
 487         av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
 488
 489     pthread_mutex_lock(&p->progress_mutex);
 490     progress[field] = n;
 491     pthread_cond_broadcast(&p->progress_cond);
 492     pthread_mutex_unlock(&p->progress_mutex);
 493 }
 494
 495 void ff_thread_await_progress(ThreadFrame *f, int n, int field)
 496 {
 497     PerThreadContext *p;
 498     volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
 499
 500     if (!progress || progress[field] >= n) return;
 501
 502     p = f->owner->internal->thread_ctx;
 503
 504     if (f->owner->debug&FF_DEBUG_THREADS)
 505         av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
 506
 507     pthread_mutex_lock(&p->progress_mutex);
 508     while (progress[field] < n)
 509         pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
 510     pthread_mutex_unlock(&p->progress_mutex);
 511 }
 512
 513 void ff_thread_finish_setup(AVCodecContext *avctx) {
 514     PerThreadContext *p = avctx->internal->thread_ctx;
 515
 516     if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
 517
 518     if(p->state == STATE_SETUP_FINISHED){
 519         av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
 520     }
 521
 522     pthread_mutex_lock(&p->progress_mutex);
 523     p->state = STATE_SETUP_FINISHED;
 524     pthread_cond_broadcast(&p->progress_cond);
 525     pthread_mutex_unlock(&p->progress_mutex);
 526 }
 527
 528 /// Waits for all threads to finish.
 529 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
 530 {
 531     int i;
 532
 533     for (i = 0; i < thread_count; i++) {
 534         PerThreadContext *p = &fctx->threads[i];
 535
 536         if (p->state != STATE_INPUT_READY) {
 537             pthread_mutex_lock(&p->progress_mutex);
 538             while (p->state != STATE_INPUT_READY)
 539                 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
 540             pthread_mutex_unlock(&p->progress_mutex);
 541         }
 542         p->got_frame = 0;
 543     }
 544 }
 545
 546 void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
 547 {
 548     FrameThreadContext *fctx = avctx->internal->thread_ctx;
 549     const AVCodec *codec = avctx->codec;
 550     int i;
 551
 552     park_frame_worker_threads(fctx, thread_count);
 553
 554     if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
 555         if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
 556             av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");
 557             fctx->prev_thread->avctx->internal->is_copy = fctx->threads->avctx->internal->is_copy;
 558             fctx->threads->avctx->internal->is_copy = 1;
 559         }
 560
 561     fctx->die = 1;
 562
 563     for (i = 0; i < thread_count; i++) {
 564         PerThreadContext *p = &fctx->threads[i];
 565
 566         pthread_mutex_lock(&p->mutex);
 567         pthread_cond_signal(&p->input_cond);
 568         pthread_mutex_unlock(&p->mutex);
 569
 570         if (p->thread_init)
 571             pthread_join(p->thread, NULL);
 572         p->thread_init=0;
 573
 574         if (codec->close)
 575             codec->close(p->avctx);
 576
 577         avctx->codec = NULL;
 578
 579         release_delayed_buffers(p);
 580         av_frame_free(&p->frame);
 581     }
 582
 583     for (i = 0; i < thread_count; i++) {
 584         PerThreadContext *p = &fctx->threads[i];
 585
 586         pthread_mutex_destroy(&p->mutex);
 587         pthread_mutex_destroy(&p->progress_mutex);
 588         pthread_cond_destroy(&p->input_cond);
 589         pthread_cond_destroy(&p->progress_cond);
 590         pthread_cond_destroy(&p->output_cond);
 591         av_packet_unref(&p->avpkt);
 592         av_freep(&p->released_buffers);
 593
 594         if (i) {
 595             av_freep(&p->avctx->priv_data);
 596             av_freep(&p->avctx->slice_offset);
 597         }
 598
 599         av_freep(&p->avctx->internal);
 600         av_freep(&p->avctx);
 601     }
 602
 603     av_freep(&fctx->threads);
 604     pthread_mutex_destroy(&fctx->buffer_mutex);
 605     av_freep(&avctx->internal->thread_ctx);
 606 }
 607
 608 int ff_frame_thread_init(AVCodecContext *avctx)
 609 {
 610     int thread_count = avctx->thread_count;
 611     const AVCodec *codec = avctx->codec;
 612     AVCodecContext *src = avctx;
 613     FrameThreadContext *fctx;
 614     int i, err = 0;
 615
 616 #if HAVE_W32THREADS
 617     w32thread_init();
 618 #endif
 619
 620     if (!thread_count) {
 621         int nb_cpus = av_cpu_count();
 622         if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
 623             nb_cpus = 1;
 624         // use number of cores + 1 as thread count if there is more than one
 625         if (nb_cpus > 1)
 626             thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
 627         else
 628             thread_count = avctx->thread_count = 1;
 629     }
 630
 631     if (thread_count <= 1) {
 632         avctx->active_thread_type = 0;
 633         return 0;
 634     }
 635
 636     avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
 637
 638     fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
 639     pthread_mutex_init(&fctx->buffer_mutex, NULL);
 640     fctx->delaying = 1;
 641
 642     for (i = 0; i < thread_count; i++) {
 643         AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
 644         PerThreadContext *p  = &fctx->threads[i];
 645
 646         pthread_mutex_init(&p->mutex, NULL);
 647         pthread_mutex_init(&p->progress_mutex, NULL);
 648         pthread_cond_init(&p->input_cond, NULL);
 649         pthread_cond_init(&p->progress_cond, NULL);
 650         pthread_cond_init(&p->output_cond, NULL);
 651
 652         p->frame = av_frame_alloc();
 653         if (!p->frame) {
 654             av_freep(&copy);
 655             err = AVERROR(ENOMEM);
 656             goto error;
 657         }
 658
 659         p->parent = fctx;
 660         p->avctx  = copy;
 661
 662         if (!copy) {
 663             err = AVERROR(ENOMEM);
 664             goto error;
 665         }
 666
 667         *copy = *src;
 668
 669         copy->internal = av_malloc(sizeof(AVCodecInternal));
 670         if (!copy->internal) {
 671             err = AVERROR(ENOMEM);
 672             goto error;
 673         }
 674         *copy->internal = *src->internal;
 675         copy->internal->thread_ctx = p;
 676         copy->internal->pkt = &p->avpkt;
 677
 678         if (!i) {
 679             src = copy;
 680
 681             if (codec->init)
 682                 err = codec->init(copy);
 683
 684             update_context_from_thread(avctx, copy, 1);
 685         } else {
 686             copy->priv_data = av_malloc(codec->priv_data_size);
 687             if (!copy->priv_data) {
 688                 err = AVERROR(ENOMEM);
 689                 goto error;
 690             }
 691             memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
 692             copy->internal->is_copy = 1;
 693
 694             if (codec->init_thread_copy)
 695                 err = codec->init_thread_copy(copy);
 696         }
 697
 698         if (err) goto error;
 699
 700         err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
 701         p->thread_init= !err;
 702         if(!p->thread_init)
 703             goto error;
 704     }
 705
 706     return 0;
 707
 708 error:
 709     ff_frame_thread_free(avctx, i+1);
 710
 711     return err;
 712 }
 713
 714 void ff_thread_flush(AVCodecContext *avctx)
 715 {
 716     int i;
 717     FrameThreadContext *fctx = avctx->internal->thread_ctx;
 718
 719     if (!fctx) return;
 720
 721     park_frame_worker_threads(fctx, avctx->thread_count);
 722     if (fctx->prev_thread) {
 723         if (fctx->prev_thread != &fctx->threads[0])
 724             update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
 725     }
 726
 727     fctx->next_decoding = fctx->next_finished = 0;
 728     fctx->delaying = 1;
 729     fctx->prev_thread = NULL;
 730     for (i = 0; i < avctx->thread_count; i++) {
 731         PerThreadContext *p = &fctx->threads[i];
 732         // Make sure decode flush calls with size=0 won't return old frames
 733         p->got_frame = 0;
 734         av_frame_unref(p->frame);
 735
 736         release_delayed_buffers(p);
 737
 738         if (avctx->codec->flush)
 739             avctx->codec->flush(p->avctx);
 740     }
 741 }
 742
 743 int ff_thread_can_start_frame(AVCodecContext *avctx)
 744 {
 745     PerThreadContext *p = avctx->internal->thread_ctx;
 746     if ((avctx->active_thread_type&FF_THREAD_FRAME) && p->state != STATE_SETTING_UP &&
 747         (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
 748         return 0;
 749     }
 750     return 1;
 751 }
 752
 753 static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int flags)
 754 {
 755     PerThreadContext *p = avctx->internal->thread_ctx;
 756     int err;
 757
 758     f->owner = avctx;
 759
 760     ff_init_buffer_info(avctx, f->f);
 761
 762     if (!(avctx->active_thread_type & FF_THREAD_FRAME))
 763         return ff_get_buffer(avctx, f->f, flags);
 764
 765     if (p->state != STATE_SETTING_UP &&
 766         (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
 767         av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
 768         return -1;
 769     }
 770
 771     if (avctx->internal->allocate_progress) {
 772         int *progress;
 773         f->progress = av_buffer_alloc(2 * sizeof(int));
 774         if (!f->progress) {
 775             return AVERROR(ENOMEM);
 776         }
 777         progress = (int*)f->progress->data;
 778
 779         progress[0] = progress[1] = -1;
 780     }
 781
 782     pthread_mutex_lock(&p->parent->buffer_mutex);
 783 FF_DISABLE_DEPRECATION_WARNINGS
 784     if (avctx->thread_safe_callbacks || (
 785 #if FF_API_GET_BUFFER
 786         !avctx->get_buffer &&
 787 #endif
 788         avctx->get_buffer2 == avcodec_default_get_buffer2)) {
 789 FF_ENABLE_DEPRECATION_WARNINGS
 790         err = ff_get_buffer(avctx, f->f, flags);
 791     } else {
 792         pthread_mutex_lock(&p->progress_mutex);
 793         p->requested_frame = f->f;
 794         p->requested_flags = flags;
 795         p->state = STATE_GET_BUFFER;
 796         pthread_cond_broadcast(&p->progress_cond);
 797
 798         while (p->state != STATE_SETTING_UP)
 799             pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
 800
 801         err = p->result;
 802
 803         pthread_mutex_unlock(&p->progress_mutex);
 804
 805     }
 806     if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
 807         ff_thread_finish_setup(avctx);
 808
 809     if (err)
 810         av_buffer_unref(&f->progress);
 811
 812     pthread_mutex_unlock(&p->parent->buffer_mutex);
 813
 814     return err;
 815 }
 816
 817 enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
 818 {
 819     enum AVPixelFormat res;
 820     PerThreadContext *p = avctx->internal->thread_ctx;
 821     if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
 822         avctx->get_format == avcodec_default_get_format)
 823         return ff_get_format(avctx, fmt);
 824     if (p->state != STATE_SETTING_UP) {
 825         av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");
 826         return -1;
 827     }
 828     pthread_mutex_lock(&p->progress_mutex);
 829     p->available_formats = fmt;
 830     p->state = STATE_GET_FORMAT;
 831     pthread_cond_broadcast(&p->progress_cond);
 832
 833     while (p->state != STATE_SETTING_UP)
 834         pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
 835
 836     res = p->result_format;
 837
 838     pthread_mutex_unlock(&p->progress_mutex);
 839
 840     return res;
 841 }
 842
 843 int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
 844 {
 845     int ret = thread_get_buffer_internal(avctx, f, flags);
 846     if (ret < 0)
 847         av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
 848     return ret;
 849 }
 850
 851 void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
 852 {
 853     PerThreadContext *p = avctx->internal->thread_ctx;
 854     FrameThreadContext *fctx;
 855     AVFrame *dst, *tmp;
 856 FF_DISABLE_DEPRECATION_WARNINGS
 857     int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
 858                           avctx->thread_safe_callbacks                   ||
 859                           (
 860 #if FF_API_GET_BUFFER
 861                            !avctx->get_buffer &&
 862 #endif
 863                            avctx->get_buffer2 == avcodec_default_get_buffer2);
 864 FF_ENABLE_DEPRECATION_WARNINGS
 865
 866     if (!f->f || !f->f->buf[0])
 867         return;
 868
 869     if (avctx->debug & FF_DEBUG_BUFFERS)
 870         av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
 871
 872     av_buffer_unref(&f->progress);
 873     f->owner    = NULL;
 874
 875     if (can_direct_free) {
 876         av_frame_unref(f->f);
 877         return;
 878     }
 879
 880     fctx = p->parent;
 881     pthread_mutex_lock(&fctx->buffer_mutex);
 882
 883     if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
 884         goto fail;
 885     tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,
 886                           (p->num_released_buffers + 1) *
 887                           sizeof(*p->released_buffers));
 888     if (!tmp)
 889         goto fail;
 890     p->released_buffers = tmp;
 891
 892     dst = &p->released_buffers[p->num_released_buffers];
 893     av_frame_move_ref(dst, f->f);
 894
 895     p->num_released_buffers++;
 896
 897 fail:
 898     pthread_mutex_unlock(&fctx->buffer_mutex);
 899 }