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  1. /*
  2.  * Copyright (c) 2004 Roman Shaposhnik
  3.  * Copyright (c) 2008 Alexander Strange (astrange@ithinksw.com)
  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.  */
  25.  
  26. /**
  27.  * @file
  28.  * Multithreading support functions
  29.  * @see doc/multithreading.txt
  30.  */
  31.  
  32. #include "config.h"
  33.  
  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"
  40. #include "libavutil/internal.h"
  41.  
  42. #if HAVE_PTHREADS
  43. #include <pthread.h>
  44. #elif HAVE_W32THREADS
  45. #include "compat/w32pthreads.h"
  46. #elif HAVE_OS2THREADS
  47. #include "compat/os2threads.h"
  48. #endif
  49.  
  50. typedef int (action_func)(AVCodecContext *c, void *arg);
  51. typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
  52.  
  53. typedef struct ThreadContext {
  54.     pthread_t *workers;
  55.     action_func *func;
  56.     action_func2 *func2;
  57.     void *args;
  58.     int *rets;
  59.     int rets_count;
  60.     int job_count;
  61.     int job_size;
  62.  
  63.     pthread_cond_t last_job_cond;
  64.     pthread_cond_t current_job_cond;
  65.     pthread_mutex_t current_job_lock;
  66.     unsigned current_execute;
  67.     int current_job;
  68.     int done;
  69.  
  70.     int *entries;
  71.     int entries_count;
  72.     int thread_count;
  73.     pthread_cond_t *progress_cond;
  74.     pthread_mutex_t *progress_mutex;
  75. } ThreadContext;
  76.  
  77. /**
  78.  * Context used by codec threads and stored in their AVCodecContext thread_opaque.
  79.  */
  80. typedef struct PerThreadContext {
  81.     struct FrameThreadContext *parent;
  82.  
  83.     pthread_t      thread;
  84.     int            thread_init;
  85.     pthread_cond_t input_cond;      ///< Used to wait for a new packet from the main thread.
  86.     pthread_cond_t progress_cond;   ///< Used by child threads to wait for progress to change.
  87.     pthread_cond_t output_cond;     ///< Used by the main thread to wait for frames to finish.
  88.  
  89.     pthread_mutex_t mutex;          ///< Mutex used to protect the contents of the PerThreadContext.
  90.     pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
  91.  
  92.     AVCodecContext *avctx;          ///< Context used to decode packets passed to this thread.
  93.  
  94.     AVPacket       avpkt;           ///< Input packet (for decoding) or output (for encoding).
  95.     uint8_t       *buf;             ///< backup storage for packet data when the input packet is not refcounted
  96.     int            allocated_buf_size; ///< Size allocated for buf
  97.  
  98.     AVFrame frame;                  ///< Output frame (for decoding) or input (for encoding).
  99.     int     got_frame;              ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
  100.     int     result;                 ///< The result of the last codec decode/encode() call.
  101.  
  102.     enum {
  103.         STATE_INPUT_READY,          ///< Set when the thread is awaiting a packet.
  104.         STATE_SETTING_UP,           ///< Set before the codec has called ff_thread_finish_setup().
  105.         STATE_GET_BUFFER,           /**<
  106.                                      * Set when the codec calls get_buffer().
  107.                                      * State is returned to STATE_SETTING_UP afterwards.
  108.                                      */
  109.         STATE_GET_FORMAT,           /**<
  110.                                      * Set when the codec calls get_format().
  111.                                      * State is returned to STATE_SETTING_UP afterwards.
  112.                                      */
  113.         STATE_SETUP_FINISHED        ///< Set after the codec has called ff_thread_finish_setup().
  114.     } state;
  115.  
  116.     /**
  117.      * Array of frames passed to ff_thread_release_buffer().
  118.      * Frames are released after all threads referencing them are finished.
  119.      */
  120.     AVFrame *released_buffers;
  121.     int  num_released_buffers;
  122.     int      released_buffers_allocated;
  123.  
  124.     AVFrame *requested_frame;       ///< AVFrame the codec passed to get_buffer()
  125.     int      requested_flags;       ///< flags passed to get_buffer() for requested_frame
  126.  
  127.     const enum AVPixelFormat *available_formats; ///< Format array for get_format()
  128.     enum AVPixelFormat result_format;            ///< get_format() result
  129. } PerThreadContext;
  130.  
  131. /**
  132.  * Context stored in the client AVCodecContext thread_opaque.
  133.  */
  134. typedef struct FrameThreadContext {
  135.     PerThreadContext *threads;     ///< The contexts for each thread.
  136.     PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
  137.  
  138.     pthread_mutex_t buffer_mutex;  ///< Mutex used to protect get/release_buffer().
  139.  
  140.     int next_decoding;             ///< The next context to submit a packet to.
  141.     int next_finished;             ///< The next context to return output from.
  142.  
  143.     int delaying;                  /**<
  144.                                     * Set for the first N packets, where N is the number of threads.
  145.                                     * While it is set, ff_thread_en/decode_frame won't return any results.
  146.                                     */
  147.  
  148.     int die;                       ///< Set when threads should exit.
  149. } FrameThreadContext;
  150.  
  151.  
  152. /* H264 slice threading seems to be buggy with more than 16 threads,
  153.  * limit the number of threads to 16 for automatic detection */
  154. #define MAX_AUTO_THREADS 16
  155.  
  156. static void* attribute_align_arg worker(void *v)
  157. {
  158.     AVCodecContext *avctx = v;
  159.     ThreadContext *c = avctx->thread_opaque;
  160.     unsigned last_execute = 0;
  161.     int our_job = c->job_count;
  162.     int thread_count = avctx->thread_count;
  163.     int self_id;
  164.  
  165.     pthread_mutex_lock(&c->current_job_lock);
  166.     self_id = c->current_job++;
  167.     for (;;){
  168.         while (our_job >= c->job_count) {
  169.             if (c->current_job == thread_count + c->job_count)
  170.                 pthread_cond_signal(&c->last_job_cond);
  171.  
  172.             while (last_execute == c->current_execute && !c->done)
  173.                 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
  174.             last_execute = c->current_execute;
  175.             our_job = self_id;
  176.  
  177.             if (c->done) {
  178.                 pthread_mutex_unlock(&c->current_job_lock);
  179.                 return NULL;
  180.             }
  181.         }
  182.         pthread_mutex_unlock(&c->current_job_lock);
  183.  
  184.         c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
  185.                                                    c->func2(avctx, c->args, our_job, self_id);
  186.  
  187.         pthread_mutex_lock(&c->current_job_lock);
  188.         our_job = c->current_job++;
  189.     }
  190. }
  191.  
  192. static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
  193. {
  194.     while (c->current_job != thread_count + c->job_count)
  195.         pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
  196.     pthread_mutex_unlock(&c->current_job_lock);
  197. }
  198.  
  199. static void thread_free(AVCodecContext *avctx)
  200. {
  201.     ThreadContext *c = avctx->thread_opaque;
  202.     int i;
  203.  
  204.     pthread_mutex_lock(&c->current_job_lock);
  205.     c->done = 1;
  206.     pthread_cond_broadcast(&c->current_job_cond);
  207.     pthread_mutex_unlock(&c->current_job_lock);
  208.  
  209.     for (i=0; i<avctx->thread_count; i++)
  210.          pthread_join(c->workers[i], NULL);
  211.  
  212.     pthread_mutex_destroy(&c->current_job_lock);
  213.     pthread_cond_destroy(&c->current_job_cond);
  214.     pthread_cond_destroy(&c->last_job_cond);
  215.     av_free(c->workers);
  216.     av_freep(&avctx->thread_opaque);
  217. }
  218.  
  219. static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
  220. {
  221.     ThreadContext *c= avctx->thread_opaque;
  222.     int dummy_ret;
  223.  
  224.     if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
  225.         return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
  226.  
  227.     if (job_count <= 0)
  228.         return 0;
  229.  
  230.     pthread_mutex_lock(&c->current_job_lock);
  231.  
  232.     c->current_job = avctx->thread_count;
  233.     c->job_count = job_count;
  234.     c->job_size = job_size;
  235.     c->args = arg;
  236.     c->func = func;
  237.     if (ret) {
  238.         c->rets = ret;
  239.         c->rets_count = job_count;
  240.     } else {
  241.         c->rets = &dummy_ret;
  242.         c->rets_count = 1;
  243.     }
  244.     c->current_execute++;
  245.     pthread_cond_broadcast(&c->current_job_cond);
  246.  
  247.     avcodec_thread_park_workers(c, avctx->thread_count);
  248.  
  249.     return 0;
  250. }
  251.  
  252. static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
  253. {
  254.     ThreadContext *c= avctx->thread_opaque;
  255.     c->func2 = func2;
  256.     return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
  257. }
  258.  
  259. static int thread_init_internal(AVCodecContext *avctx)
  260. {
  261.     int i;
  262.     ThreadContext *c;
  263.     int thread_count = avctx->thread_count;
  264.  
  265.     if (!thread_count) {
  266.         int nb_cpus = av_cpu_count();
  267.         if  (avctx->height)
  268.             nb_cpus = FFMIN(nb_cpus, (avctx->height+15)/16);
  269.         // use number of cores + 1 as thread count if there is more than one
  270.         if (nb_cpus > 1)
  271.             thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
  272.         else
  273.             thread_count = avctx->thread_count = 1;
  274.     }
  275.  
  276.     if (thread_count <= 1) {
  277.         avctx->active_thread_type = 0;
  278.         return 0;
  279.     }
  280.  
  281.     c = av_mallocz(sizeof(ThreadContext));
  282.     if (!c)
  283.         return -1;
  284.  
  285.     c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
  286.     if (!c->workers) {
  287.         av_free(c);
  288.         return -1;
  289.     }
  290.  
  291.     avctx->thread_opaque = c;
  292.     c->current_job = 0;
  293.     c->job_count = 0;
  294.     c->job_size = 0;
  295.     c->done = 0;
  296.     pthread_cond_init(&c->current_job_cond, NULL);
  297.     pthread_cond_init(&c->last_job_cond, NULL);
  298.     pthread_mutex_init(&c->current_job_lock, NULL);
  299.     pthread_mutex_lock(&c->current_job_lock);
  300.     for (i=0; i<thread_count; i++) {
  301.         if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
  302.            avctx->thread_count = i;
  303.            pthread_mutex_unlock(&c->current_job_lock);
  304.            ff_thread_free(avctx);
  305.            return -1;
  306.         }
  307.     }
  308.  
  309.     avcodec_thread_park_workers(c, thread_count);
  310.  
  311.     avctx->execute = avcodec_thread_execute;
  312.     avctx->execute2 = avcodec_thread_execute2;
  313.     return 0;
  314. }
  315.  
  316. #define THREAD_SAFE_CALLBACKS(avctx) \
  317. ((avctx)->thread_safe_callbacks || (!(avctx)->get_buffer && (avctx)->get_buffer2 == avcodec_default_get_buffer2))
  318.  
  319. /**
  320.  * Codec worker thread.
  321.  *
  322.  * Automatically calls ff_thread_finish_setup() if the codec does
  323.  * not provide an update_thread_context method, or if the codec returns
  324.  * before calling it.
  325.  */
  326. static attribute_align_arg void *frame_worker_thread(void *arg)
  327. {
  328.     PerThreadContext *p = arg;
  329.     FrameThreadContext *fctx = p->parent;
  330.     AVCodecContext *avctx = p->avctx;
  331.     const AVCodec *codec = avctx->codec;
  332.  
  333.     pthread_mutex_lock(&p->mutex);
  334.     while (1) {
  335.             while (p->state == STATE_INPUT_READY && !fctx->die)
  336.                 pthread_cond_wait(&p->input_cond, &p->mutex);
  337.  
  338.         if (fctx->die) break;
  339.  
  340.         if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
  341.             ff_thread_finish_setup(avctx);
  342.  
  343.         avcodec_get_frame_defaults(&p->frame);
  344.         p->got_frame = 0;
  345.         p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
  346.  
  347.         /* many decoders assign whole AVFrames, thus overwriting extended_data;
  348.          * make sure it's set correctly */
  349.         p->frame.extended_data = p->frame.data;
  350.  
  351.         if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
  352.  
  353.         pthread_mutex_lock(&p->progress_mutex);
  354. #if 0 //BUFREF-FIXME
  355.         for (i = 0; i < MAX_BUFFERS; i++)
  356.             if (p->progress_used[i] && (p->got_frame || p->result<0 || avctx->codec_id != AV_CODEC_ID_H264)) {
  357.                 p->progress[i][0] = INT_MAX;
  358.                 p->progress[i][1] = INT_MAX;
  359.             }
  360. #endif
  361.         p->state = STATE_INPUT_READY;
  362.  
  363.         pthread_cond_broadcast(&p->progress_cond);
  364.         pthread_cond_signal(&p->output_cond);
  365.         pthread_mutex_unlock(&p->progress_mutex);
  366.     }
  367.     pthread_mutex_unlock(&p->mutex);
  368.  
  369.     return NULL;
  370. }
  371.  
  372. /**
  373.  * Update the next thread's AVCodecContext with values from the reference thread's context.
  374.  *
  375.  * @param dst The destination context.
  376.  * @param src The source context.
  377.  * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
  378.  */
  379. static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
  380. {
  381.     int err = 0;
  382.  
  383.     if (dst != src) {
  384.         dst->time_base = src->time_base;
  385.         dst->width     = src->width;
  386.         dst->height    = src->height;
  387.         dst->pix_fmt   = src->pix_fmt;
  388.  
  389.         dst->coded_width  = src->coded_width;
  390.         dst->coded_height = src->coded_height;
  391.  
  392.         dst->has_b_frames = src->has_b_frames;
  393.         dst->idct_algo    = src->idct_algo;
  394.  
  395.         dst->bits_per_coded_sample = src->bits_per_coded_sample;
  396.         dst->sample_aspect_ratio   = src->sample_aspect_ratio;
  397.         dst->dtg_active_format     = src->dtg_active_format;
  398.  
  399.         dst->profile = src->profile;
  400.         dst->level   = src->level;
  401.  
  402.         dst->bits_per_raw_sample = src->bits_per_raw_sample;
  403.         dst->ticks_per_frame     = src->ticks_per_frame;
  404.         dst->color_primaries     = src->color_primaries;
  405.  
  406.         dst->color_trc   = src->color_trc;
  407.         dst->colorspace  = src->colorspace;
  408.         dst->color_range = src->color_range;
  409.         dst->chroma_sample_location = src->chroma_sample_location;
  410.  
  411.         dst->hwaccel = src->hwaccel;
  412.         dst->hwaccel_context = src->hwaccel_context;
  413.  
  414.         dst->channels       = src->channels;
  415.         dst->sample_rate    = src->sample_rate;
  416.         dst->sample_fmt     = src->sample_fmt;
  417.         dst->channel_layout = src->channel_layout;
  418.     }
  419.  
  420.     if (for_user) {
  421.         dst->delay       = src->thread_count - 1;
  422.         dst->coded_frame = src->coded_frame;
  423.     } else {
  424.         if (dst->codec->update_thread_context)
  425.             err = dst->codec->update_thread_context(dst, src);
  426.     }
  427.  
  428.     return err;
  429. }
  430.  
  431. /**
  432.  * Update the next thread's AVCodecContext with values set by the user.
  433.  *
  434.  * @param dst The destination context.
  435.  * @param src The source context.
  436.  * @return 0 on success, negative error code on failure
  437.  */
  438. static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
  439. {
  440. #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
  441.     dst->flags          = src->flags;
  442.  
  443.     dst->draw_horiz_band= src->draw_horiz_band;
  444.     dst->get_buffer2    = src->get_buffer2;
  445. #if FF_API_GET_BUFFER
  446. FF_DISABLE_DEPRECATION_WARNINGS
  447.     dst->get_buffer     = src->get_buffer;
  448.     dst->release_buffer = src->release_buffer;
  449. FF_ENABLE_DEPRECATION_WARNINGS
  450. #endif
  451.  
  452.     dst->opaque   = src->opaque;
  453.     dst->debug    = src->debug;
  454.     dst->debug_mv = src->debug_mv;
  455.  
  456.     dst->slice_flags = src->slice_flags;
  457.     dst->flags2      = src->flags2;
  458.  
  459.     copy_fields(skip_loop_filter, subtitle_header);
  460.  
  461.     dst->frame_number     = src->frame_number;
  462.     dst->reordered_opaque = src->reordered_opaque;
  463.     dst->thread_safe_callbacks = src->thread_safe_callbacks;
  464.  
  465.     if (src->slice_count && src->slice_offset) {
  466.         if (dst->slice_count < src->slice_count) {
  467.             int *tmp = av_realloc(dst->slice_offset, src->slice_count *
  468.                                   sizeof(*dst->slice_offset));
  469.             if (!tmp) {
  470.                 av_free(dst->slice_offset);
  471.                 return AVERROR(ENOMEM);
  472.             }
  473.             dst->slice_offset = tmp;
  474.         }
  475.         memcpy(dst->slice_offset, src->slice_offset,
  476.                src->slice_count * sizeof(*dst->slice_offset));
  477.     }
  478.     dst->slice_count = src->slice_count;
  479.     return 0;
  480. #undef copy_fields
  481. }
  482.  
  483. /// Releases the buffers that this decoding thread was the last user of.
  484. static void release_delayed_buffers(PerThreadContext *p)
  485. {
  486.     FrameThreadContext *fctx = p->parent;
  487.  
  488.     while (p->num_released_buffers > 0) {
  489.         AVFrame *f;
  490.  
  491.         pthread_mutex_lock(&fctx->buffer_mutex);
  492.  
  493.         // fix extended data in case the caller screwed it up
  494.         av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
  495.                    p->avctx->codec_type == AVMEDIA_TYPE_AUDIO);
  496.         f = &p->released_buffers[--p->num_released_buffers];
  497.         f->extended_data = f->data;
  498.         av_frame_unref(f);
  499.  
  500.         pthread_mutex_unlock(&fctx->buffer_mutex);
  501.     }
  502. }
  503.  
  504. static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
  505. {
  506.     FrameThreadContext *fctx = p->parent;
  507.     PerThreadContext *prev_thread = fctx->prev_thread;
  508.     const AVCodec *codec = p->avctx->codec;
  509.  
  510.     if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
  511.  
  512.     pthread_mutex_lock(&p->mutex);
  513.  
  514.     release_delayed_buffers(p);
  515.  
  516.     if (prev_thread) {
  517.         int err;
  518.         if (prev_thread->state == STATE_SETTING_UP) {
  519.             pthread_mutex_lock(&prev_thread->progress_mutex);
  520.             while (prev_thread->state == STATE_SETTING_UP)
  521.                 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
  522.             pthread_mutex_unlock(&prev_thread->progress_mutex);
  523.         }
  524.  
  525.         err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
  526.         if (err) {
  527.             pthread_mutex_unlock(&p->mutex);
  528.             return err;
  529.         }
  530.     }
  531.  
  532.     av_buffer_unref(&p->avpkt.buf);
  533.     p->avpkt = *avpkt;
  534.     if (avpkt->buf)
  535.         p->avpkt.buf = av_buffer_ref(avpkt->buf);
  536.     else {
  537.         av_fast_malloc(&p->buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
  538.         p->avpkt.data = p->buf;
  539.         memcpy(p->buf, avpkt->data, avpkt->size);
  540.         memset(p->buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
  541.     }
  542.  
  543.     p->state = STATE_SETTING_UP;
  544.     pthread_cond_signal(&p->input_cond);
  545.     pthread_mutex_unlock(&p->mutex);
  546.  
  547.     /*
  548.      * If the client doesn't have a thread-safe get_buffer(),
  549.      * then decoding threads call back to the main thread,
  550.      * and it calls back to the client here.
  551.      */
  552.  
  553. FF_DISABLE_DEPRECATION_WARNINGS
  554.     if (!p->avctx->thread_safe_callbacks && (
  555.          p->avctx->get_format != avcodec_default_get_format ||
  556. #if FF_API_GET_BUFFER
  557.          p->avctx->get_buffer ||
  558. #endif
  559.          p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
  560. FF_ENABLE_DEPRECATION_WARNINGS
  561.         while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
  562.             int call_done = 1;
  563.             pthread_mutex_lock(&p->progress_mutex);
  564.             while (p->state == STATE_SETTING_UP)
  565.                 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
  566.  
  567.             switch (p->state) {
  568.             case STATE_GET_BUFFER:
  569.                 p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
  570.                 break;
  571.             case STATE_GET_FORMAT:
  572.                 p->result_format = p->avctx->get_format(p->avctx, p->available_formats);
  573.                 break;
  574.             default:
  575.                 call_done = 0;
  576.                 break;
  577.             }
  578.             if (call_done) {
  579.                 p->state  = STATE_SETTING_UP;
  580.                 pthread_cond_signal(&p->progress_cond);
  581.             }
  582.             pthread_mutex_unlock(&p->progress_mutex);
  583.         }
  584.     }
  585.  
  586.     fctx->prev_thread = p;
  587.     fctx->next_decoding++;
  588.  
  589.     return 0;
  590. }
  591.  
  592. int ff_thread_decode_frame(AVCodecContext *avctx,
  593.                            AVFrame *picture, int *got_picture_ptr,
  594.                            AVPacket *avpkt)
  595. {
  596.     FrameThreadContext *fctx = avctx->thread_opaque;
  597.     int finished = fctx->next_finished;
  598.     PerThreadContext *p;
  599.     int err;
  600.  
  601.     /*
  602.      * Submit a packet to the next decoding thread.
  603.      */
  604.  
  605.     p = &fctx->threads[fctx->next_decoding];
  606.     err = update_context_from_user(p->avctx, avctx);
  607.     if (err) return err;
  608.     err = submit_packet(p, avpkt);
  609.     if (err) return err;
  610.  
  611.     /*
  612.      * If we're still receiving the initial packets, don't return a frame.
  613.      */
  614.  
  615.     if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
  616.         fctx->delaying = 0;
  617.  
  618.     if (fctx->delaying) {
  619.         *got_picture_ptr=0;
  620.         if (avpkt->size)
  621.             return avpkt->size;
  622.     }
  623.  
  624.     /*
  625.      * Return the next available frame from the oldest thread.
  626.      * If we're at the end of the stream, then we have to skip threads that
  627.      * didn't output a frame, because we don't want to accidentally signal
  628.      * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
  629.      */
  630.  
  631.     do {
  632.         p = &fctx->threads[finished++];
  633.  
  634.         if (p->state != STATE_INPUT_READY) {
  635.             pthread_mutex_lock(&p->progress_mutex);
  636.             while (p->state != STATE_INPUT_READY)
  637.                 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
  638.             pthread_mutex_unlock(&p->progress_mutex);
  639.         }
  640.  
  641.         av_frame_move_ref(picture, &p->frame);
  642.         *got_picture_ptr = p->got_frame;
  643.         picture->pkt_dts = p->avpkt.dts;
  644.  
  645.         /*
  646.          * A later call with avkpt->size == 0 may loop over all threads,
  647.          * including this one, searching for a frame to return before being
  648.          * stopped by the "finished != fctx->next_finished" condition.
  649.          * Make sure we don't mistakenly return the same frame again.
  650.          */
  651.         p->got_frame = 0;
  652.  
  653.         if (finished >= avctx->thread_count) finished = 0;
  654.     } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
  655.  
  656.     update_context_from_thread(avctx, p->avctx, 1);
  657.  
  658.     if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
  659.  
  660.     fctx->next_finished = finished;
  661.  
  662.     /* return the size of the consumed packet if no error occurred */
  663.     return (p->result >= 0) ? avpkt->size : p->result;
  664. }
  665.  
  666. void ff_thread_report_progress(ThreadFrame *f, int n, int field)
  667. {
  668.     PerThreadContext *p;
  669.     volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
  670.  
  671.     if (!progress || progress[field] >= n) return;
  672.  
  673.     p = f->owner->thread_opaque;
  674.  
  675.     if (f->owner->debug&FF_DEBUG_THREADS)
  676.         av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
  677.  
  678.     pthread_mutex_lock(&p->progress_mutex);
  679.     progress[field] = n;
  680.     pthread_cond_broadcast(&p->progress_cond);
  681.     pthread_mutex_unlock(&p->progress_mutex);
  682. }
  683.  
  684. void ff_thread_await_progress(ThreadFrame *f, int n, int field)
  685. {
  686.     PerThreadContext *p;
  687.     volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
  688.  
  689.     if (!progress || progress[field] >= n) return;
  690.  
  691.     p = f->owner->thread_opaque;
  692.  
  693.     if (f->owner->debug&FF_DEBUG_THREADS)
  694.         av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
  695.  
  696.     pthread_mutex_lock(&p->progress_mutex);
  697.     while (progress[field] < n)
  698.         pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
  699.     pthread_mutex_unlock(&p->progress_mutex);
  700. }
  701.  
  702. void ff_thread_finish_setup(AVCodecContext *avctx) {
  703.     PerThreadContext *p = avctx->thread_opaque;
  704.  
  705.     if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
  706.  
  707.     if(p->state == STATE_SETUP_FINISHED){
  708.         av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
  709.     }
  710.  
  711.     pthread_mutex_lock(&p->progress_mutex);
  712.     p->state = STATE_SETUP_FINISHED;
  713.     pthread_cond_broadcast(&p->progress_cond);
  714.     pthread_mutex_unlock(&p->progress_mutex);
  715. }
  716.  
  717. /// Waits for all threads to finish.
  718. static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
  719. {
  720.     int i;
  721.  
  722.     for (i = 0; i < thread_count; i++) {
  723.         PerThreadContext *p = &fctx->threads[i];
  724.  
  725.         if (p->state != STATE_INPUT_READY) {
  726.             pthread_mutex_lock(&p->progress_mutex);
  727.             while (p->state != STATE_INPUT_READY)
  728.                 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
  729.             pthread_mutex_unlock(&p->progress_mutex);
  730.         }
  731.         p->got_frame = 0;
  732.     }
  733. }
  734.  
  735. static void frame_thread_free(AVCodecContext *avctx, int thread_count)
  736. {
  737.     FrameThreadContext *fctx = avctx->thread_opaque;
  738.     const AVCodec *codec = avctx->codec;
  739.     int i;
  740.  
  741.     park_frame_worker_threads(fctx, thread_count);
  742.  
  743.     if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
  744.         if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
  745.             av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");
  746.             fctx->prev_thread->avctx->internal->is_copy = fctx->threads->avctx->internal->is_copy;
  747.             fctx->threads->avctx->internal->is_copy = 1;
  748.         }
  749.  
  750.     fctx->die = 1;
  751.  
  752.     for (i = 0; i < thread_count; i++) {
  753.         PerThreadContext *p = &fctx->threads[i];
  754.  
  755.         pthread_mutex_lock(&p->mutex);
  756.         pthread_cond_signal(&p->input_cond);
  757.         pthread_mutex_unlock(&p->mutex);
  758.  
  759.         if (p->thread_init)
  760.             pthread_join(p->thread, NULL);
  761.         p->thread_init=0;
  762.  
  763.         if (codec->close)
  764.             codec->close(p->avctx);
  765.  
  766.         avctx->codec = NULL;
  767.  
  768.         release_delayed_buffers(p);
  769.         av_frame_unref(&p->frame);
  770.     }
  771.  
  772.     for (i = 0; i < thread_count; i++) {
  773.         PerThreadContext *p = &fctx->threads[i];
  774.  
  775.         pthread_mutex_destroy(&p->mutex);
  776.         pthread_mutex_destroy(&p->progress_mutex);
  777.         pthread_cond_destroy(&p->input_cond);
  778.         pthread_cond_destroy(&p->progress_cond);
  779.         pthread_cond_destroy(&p->output_cond);
  780.         av_buffer_unref(&p->avpkt.buf);
  781.         av_freep(&p->buf);
  782.         av_freep(&p->released_buffers);
  783.  
  784.         if (i) {
  785.             av_freep(&p->avctx->priv_data);
  786.             av_freep(&p->avctx->internal);
  787.             av_freep(&p->avctx->slice_offset);
  788.         }
  789.  
  790.         av_freep(&p->avctx);
  791.     }
  792.  
  793.     av_freep(&fctx->threads);
  794.     pthread_mutex_destroy(&fctx->buffer_mutex);
  795.     av_freep(&avctx->thread_opaque);
  796. }
  797.  
  798. static int frame_thread_init(AVCodecContext *avctx)
  799. {
  800.     int thread_count = avctx->thread_count;
  801.     const AVCodec *codec = avctx->codec;
  802.     AVCodecContext *src = avctx;
  803.     FrameThreadContext *fctx;
  804.     int i, err = 0;
  805.  
  806.     if (!thread_count) {
  807.         int nb_cpus = av_cpu_count();
  808.         if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
  809.             nb_cpus = 1;
  810.         // use number of cores + 1 as thread count if there is more than one
  811.         if (nb_cpus > 1)
  812.             thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
  813.         else
  814.             thread_count = avctx->thread_count = 1;
  815.     }
  816.  
  817.     if (thread_count <= 1) {
  818.         avctx->active_thread_type = 0;
  819.         return 0;
  820.     }
  821.  
  822.     avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));
  823.  
  824.     fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
  825.     pthread_mutex_init(&fctx->buffer_mutex, NULL);
  826.     fctx->delaying = 1;
  827.  
  828.     for (i = 0; i < thread_count; i++) {
  829.         AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
  830.         PerThreadContext *p  = &fctx->threads[i];
  831.  
  832.         pthread_mutex_init(&p->mutex, NULL);
  833.         pthread_mutex_init(&p->progress_mutex, NULL);
  834.         pthread_cond_init(&p->input_cond, NULL);
  835.         pthread_cond_init(&p->progress_cond, NULL);
  836.         pthread_cond_init(&p->output_cond, NULL);
  837.  
  838.         p->parent = fctx;
  839.         p->avctx  = copy;
  840.  
  841.         if (!copy) {
  842.             err = AVERROR(ENOMEM);
  843.             goto error;
  844.         }
  845.  
  846.         *copy = *src;
  847.         copy->thread_opaque = p;
  848.         copy->pkt = &p->avpkt;
  849.  
  850.         if (!i) {
  851.             src = copy;
  852.  
  853.             if (codec->init)
  854.                 err = codec->init(copy);
  855.  
  856.             update_context_from_thread(avctx, copy, 1);
  857.         } else {
  858.             copy->priv_data = av_malloc(codec->priv_data_size);
  859.             if (!copy->priv_data) {
  860.                 err = AVERROR(ENOMEM);
  861.                 goto error;
  862.             }
  863.             memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
  864.             copy->internal = av_malloc(sizeof(AVCodecInternal));
  865.             if (!copy->internal) {
  866.                 err = AVERROR(ENOMEM);
  867.                 goto error;
  868.             }
  869.             *copy->internal = *src->internal;
  870.             copy->internal->is_copy = 1;
  871.  
  872.             if (codec->init_thread_copy)
  873.                 err = codec->init_thread_copy(copy);
  874.         }
  875.  
  876.         if (err) goto error;
  877.  
  878.         err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
  879.         p->thread_init= !err;
  880.         if(!p->thread_init)
  881.             goto error;
  882.     }
  883.  
  884.     return 0;
  885.  
  886. error:
  887.     frame_thread_free(avctx, i+1);
  888.  
  889.     return err;
  890. }
  891.  
  892. void ff_thread_flush(AVCodecContext *avctx)
  893. {
  894.     int i;
  895.     FrameThreadContext *fctx = avctx->thread_opaque;
  896.  
  897.     if (!avctx->thread_opaque) return;
  898.  
  899.     park_frame_worker_threads(fctx, avctx->thread_count);
  900.     if (fctx->prev_thread) {
  901.         if (fctx->prev_thread != &fctx->threads[0])
  902.             update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
  903.         if (avctx->codec->flush)
  904.             avctx->codec->flush(fctx->threads[0].avctx);
  905.     }
  906.  
  907.     fctx->next_decoding = fctx->next_finished = 0;
  908.     fctx->delaying = 1;
  909.     fctx->prev_thread = NULL;
  910.     for (i = 0; i < avctx->thread_count; i++) {
  911.         PerThreadContext *p = &fctx->threads[i];
  912.         // Make sure decode flush calls with size=0 won't return old frames
  913.         p->got_frame = 0;
  914.         av_frame_unref(&p->frame);
  915.  
  916.         release_delayed_buffers(p);
  917.     }
  918. }
  919.  
  920. int ff_thread_can_start_frame(AVCodecContext *avctx)
  921. {
  922.     PerThreadContext *p = avctx->thread_opaque;
  923.     if ((avctx->active_thread_type&FF_THREAD_FRAME) && p->state != STATE_SETTING_UP &&
  924.         (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
  925.         return 0;
  926.     }
  927.     return 1;
  928. }
  929.  
  930. static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int flags)
  931. {
  932.     PerThreadContext *p = avctx->thread_opaque;
  933.     int err;
  934.  
  935.     f->owner = avctx;
  936.  
  937.     ff_init_buffer_info(avctx, f->f);
  938.  
  939.     if (!(avctx->active_thread_type & FF_THREAD_FRAME))
  940.         return ff_get_buffer(avctx, f->f, flags);
  941.  
  942.     if (p->state != STATE_SETTING_UP &&
  943.         (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
  944.         av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
  945.         return -1;
  946.     }
  947.  
  948.     if (avctx->internal->allocate_progress) {
  949.         int *progress;
  950.         f->progress = av_buffer_alloc(2 * sizeof(int));
  951.         if (!f->progress) {
  952.             return AVERROR(ENOMEM);
  953.         }
  954.         progress = (int*)f->progress->data;
  955.  
  956.         progress[0] = progress[1] = -1;
  957.     }
  958.  
  959.     pthread_mutex_lock(&p->parent->buffer_mutex);
  960.  
  961. FF_DISABLE_DEPRECATION_WARNINGS
  962.     if (avctx->thread_safe_callbacks || (
  963. #if FF_API_GET_BUFFER
  964.         !avctx->get_buffer &&
  965. #endif
  966.         avctx->get_buffer2 == avcodec_default_get_buffer2)) {
  967. FF_ENABLE_DEPRECATION_WARNINGS
  968.         err = ff_get_buffer(avctx, f->f, flags);
  969.     } else {
  970.         pthread_mutex_lock(&p->progress_mutex);
  971.         p->requested_frame = f->f;
  972.         p->requested_flags = flags;
  973.         p->state = STATE_GET_BUFFER;
  974.         pthread_cond_broadcast(&p->progress_cond);
  975.  
  976.         while (p->state != STATE_SETTING_UP)
  977.             pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
  978.  
  979.         err = p->result;
  980.  
  981.         pthread_mutex_unlock(&p->progress_mutex);
  982.  
  983.     }
  984.     if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
  985.         ff_thread_finish_setup(avctx);
  986.  
  987.     if (err)
  988.         av_buffer_unref(&f->progress);
  989.  
  990.     pthread_mutex_unlock(&p->parent->buffer_mutex);
  991.  
  992.     return err;
  993. }
  994.  
  995. enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
  996. {
  997.     enum AVPixelFormat res;
  998.     PerThreadContext *p = avctx->thread_opaque;
  999.     if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
  1000.         avctx->get_format == avcodec_default_get_format)
  1001.         return avctx->get_format(avctx, fmt);
  1002.     if (p->state != STATE_SETTING_UP) {
  1003.         av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");
  1004.         return -1;
  1005.     }
  1006.     pthread_mutex_lock(&p->progress_mutex);
  1007.     p->available_formats = fmt;
  1008.     p->state = STATE_GET_FORMAT;
  1009.     pthread_cond_broadcast(&p->progress_cond);
  1010.  
  1011.     while (p->state != STATE_SETTING_UP)
  1012.         pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
  1013.  
  1014.     res = p->result_format;
  1015.  
  1016.     pthread_mutex_unlock(&p->progress_mutex);
  1017.  
  1018.     return res;
  1019. }
  1020.  
  1021. int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
  1022. {
  1023.     int ret = thread_get_buffer_internal(avctx, f, flags);
  1024.     if (ret < 0)
  1025.         av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
  1026.     return ret;
  1027. }
  1028.  
  1029. void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
  1030. {
  1031.     PerThreadContext *p = avctx->thread_opaque;
  1032.     FrameThreadContext *fctx;
  1033.     AVFrame *dst, *tmp;
  1034. FF_DISABLE_DEPRECATION_WARNINGS
  1035.     int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
  1036.                           avctx->thread_safe_callbacks                   ||
  1037.                           (
  1038. #if FF_API_GET_BUFFER
  1039.                            !avctx->get_buffer &&
  1040. #endif
  1041.                            avctx->get_buffer2 == avcodec_default_get_buffer2);
  1042. FF_ENABLE_DEPRECATION_WARNINGS
  1043.  
  1044.     if (!f->f->data[0])
  1045.         return;
  1046.  
  1047.     if (avctx->debug & FF_DEBUG_BUFFERS)
  1048.         av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
  1049.  
  1050.     av_buffer_unref(&f->progress);
  1051.     f->owner    = NULL;
  1052.  
  1053.     if (can_direct_free) {
  1054.         av_frame_unref(f->f);
  1055.         return;
  1056.     }
  1057.  
  1058.     fctx = p->parent;
  1059.     pthread_mutex_lock(&fctx->buffer_mutex);
  1060.  
  1061.     if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
  1062.         goto fail;
  1063.     tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,
  1064.                           (p->num_released_buffers + 1) *
  1065.                           sizeof(*p->released_buffers));
  1066.     if (!tmp)
  1067.         goto fail;
  1068.     p->released_buffers = tmp;
  1069.  
  1070.     dst = &p->released_buffers[p->num_released_buffers];
  1071.     av_frame_move_ref(dst, f->f);
  1072.  
  1073.     p->num_released_buffers++;
  1074.  
  1075. fail:
  1076.     pthread_mutex_unlock(&fctx->buffer_mutex);
  1077. }
  1078.  
  1079. /**
  1080.  * Set the threading algorithms used.
  1081.  *
  1082.  * Threading requires more than one thread.
  1083.  * Frame threading requires entire frames to be passed to the codec,
  1084.  * and introduces extra decoding delay, so is incompatible with low_delay.
  1085.  *
  1086.  * @param avctx The context.
  1087.  */
  1088. static void validate_thread_parameters(AVCodecContext *avctx)
  1089. {
  1090.     int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
  1091.                                 && !(avctx->flags & CODEC_FLAG_TRUNCATED)
  1092.                                 && !(avctx->flags & CODEC_FLAG_LOW_DELAY)
  1093.                                 && !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
  1094.     if (avctx->thread_count == 1) {
  1095.         avctx->active_thread_type = 0;
  1096.     } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
  1097.         avctx->active_thread_type = FF_THREAD_FRAME;
  1098.     } else if (avctx->codec->capabilities & CODEC_CAP_SLICE_THREADS &&
  1099.                avctx->thread_type & FF_THREAD_SLICE) {
  1100.         avctx->active_thread_type = FF_THREAD_SLICE;
  1101.     } else if (!(avctx->codec->capabilities & CODEC_CAP_AUTO_THREADS)) {
  1102.         avctx->thread_count       = 1;
  1103.         avctx->active_thread_type = 0;
  1104.     }
  1105.  
  1106.     if (avctx->thread_count > MAX_AUTO_THREADS)
  1107.         av_log(avctx, AV_LOG_WARNING,
  1108.                "Application has requested %d threads. Using a thread count greater than %d is not recommended.\n",
  1109.                avctx->thread_count, MAX_AUTO_THREADS);
  1110. }
  1111.  
  1112. int ff_thread_init(AVCodecContext *avctx)
  1113. {
  1114. #if HAVE_W32THREADS
  1115.     w32thread_init();
  1116. #endif
  1117.  
  1118.     validate_thread_parameters(avctx);
  1119.  
  1120.     if (avctx->active_thread_type&FF_THREAD_SLICE)
  1121.         return thread_init_internal(avctx);
  1122.     else if (avctx->active_thread_type&FF_THREAD_FRAME)
  1123.         return frame_thread_init(avctx);
  1124.  
  1125.     return 0;
  1126. }
  1127.  
  1128. void ff_thread_free(AVCodecContext *avctx)
  1129. {
  1130.     if (avctx->active_thread_type&FF_THREAD_FRAME)
  1131.         frame_thread_free(avctx, avctx->thread_count);
  1132.     else
  1133.         thread_free(avctx);
  1134. }
  1135.  
  1136. void ff_thread_report_progress2(AVCodecContext *avctx, int field, int thread, int n)
  1137. {
  1138.     ThreadContext *p = avctx->thread_opaque;
  1139.     int *entries = p->entries;
  1140.  
  1141.     pthread_mutex_lock(&p->progress_mutex[thread]);
  1142.     entries[field] +=n;
  1143.     pthread_cond_signal(&p->progress_cond[thread]);
  1144.     pthread_mutex_unlock(&p->progress_mutex[thread]);
  1145. }
  1146.  
  1147. void ff_thread_await_progress2(AVCodecContext *avctx, int field, int thread, int shift)
  1148. {
  1149.     ThreadContext *p  = avctx->thread_opaque;
  1150.     int *entries      = p->entries;
  1151.  
  1152.     if (!entries || !field) return;
  1153.  
  1154.     thread = thread ? thread - 1 : p->thread_count - 1;
  1155.  
  1156.     pthread_mutex_lock(&p->progress_mutex[thread]);
  1157.     while ((entries[field - 1] - entries[field]) < shift){
  1158.         pthread_cond_wait(&p->progress_cond[thread], &p->progress_mutex[thread]);
  1159.     }
  1160.     pthread_mutex_unlock(&p->progress_mutex[thread]);
  1161. }
  1162.  
  1163. int ff_alloc_entries(AVCodecContext *avctx, int count)
  1164. {
  1165.     int i;
  1166.  
  1167.     if (avctx->active_thread_type & FF_THREAD_SLICE)  {
  1168.         ThreadContext *p = avctx->thread_opaque;
  1169.         p->thread_count  = avctx->thread_count;
  1170.         p->entries       = av_mallocz(count * sizeof(int));
  1171.  
  1172.         if (!p->entries) {
  1173.             return AVERROR(ENOMEM);
  1174.         }
  1175.  
  1176.         p->entries_count  = count;
  1177.         p->progress_mutex = av_malloc(p->thread_count * sizeof(pthread_mutex_t));
  1178.         p->progress_cond  = av_malloc(p->thread_count * sizeof(pthread_cond_t));
  1179.  
  1180.         for (i = 0; i < p->thread_count; i++) {
  1181.             pthread_mutex_init(&p->progress_mutex[i], NULL);
  1182.             pthread_cond_init(&p->progress_cond[i], NULL);
  1183.         }
  1184.     }
  1185.  
  1186.     return 0;
  1187. }
  1188.  
  1189. void ff_reset_entries(AVCodecContext *avctx)
  1190. {
  1191.     ThreadContext *p = avctx->thread_opaque;
  1192.     memset(p->entries, 0, p->entries_count * sizeof(int));
  1193. }
  1194.