GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/pthread_slice.c Lines: 40 113 35.4 %
Date: 2019-11-18 18:00:01 Branches: 15 58 25.9 %

Line Branch Exec Source
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/*
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * Slice multithreading support functions
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 * @see doc/multithreading.txt
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 */
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#include "config.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "pthread_internal.h"
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#include "thread.h"
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#include "libavutil/avassert.h"
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#include "libavutil/common.h"
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#include "libavutil/cpu.h"
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#include "libavutil/mem.h"
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#include "libavutil/thread.h"
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#include "libavutil/slicethread.h"
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typedef int (action_func)(AVCodecContext *c, void *arg);
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typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
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typedef int (main_func)(AVCodecContext *c);
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typedef struct SliceThreadContext {
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    AVSliceThread *thread;
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    action_func *func;
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    action_func2 *func2;
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    main_func *mainfunc;
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    void *args;
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    int *rets;
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    int job_size;
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    int *entries;
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    int entries_count;
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    int thread_count;
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    pthread_cond_t *progress_cond;
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    pthread_mutex_t *progress_mutex;
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} SliceThreadContext;
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static void main_function(void *priv) {
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    AVCodecContext *avctx = priv;
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    SliceThreadContext *c = avctx->internal->thread_ctx;
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    c->mainfunc(avctx);
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}
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static void worker_func(void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads)
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{
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    AVCodecContext *avctx = priv;
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    SliceThreadContext *c = avctx->internal->thread_ctx;
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    int ret;
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    ret = c->func ? c->func(avctx, (char *)c->args + c->job_size * jobnr)
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                  : c->func2(avctx, c->args, jobnr, threadnr);
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    if (c->rets)
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        c->rets[jobnr] = ret;
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}
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void ff_slice_thread_free(AVCodecContext *avctx)
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{
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    SliceThreadContext *c = avctx->internal->thread_ctx;
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    int i;
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    avpriv_slicethread_free(&c->thread);
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    for (i = 0; i < c->thread_count; i++) {
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        pthread_mutex_destroy(&c->progress_mutex[i]);
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        pthread_cond_destroy(&c->progress_cond[i]);
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    }
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    av_freep(&c->entries);
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    av_freep(&c->progress_mutex);
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    av_freep(&c->progress_cond);
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    av_freep(&avctx->internal->thread_ctx);
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}
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static int thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
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{
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    SliceThreadContext *c = avctx->internal->thread_ctx;
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    if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
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        return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
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    if (job_count <= 0)
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        return 0;
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    c->job_size = job_size;
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    c->args = arg;
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    c->func = func;
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    c->rets = ret;
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    avpriv_slicethread_execute(c->thread, job_count, !!c->mainfunc  );
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    return 0;
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}
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static int thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
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{
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    SliceThreadContext *c = avctx->internal->thread_ctx;
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    c->func2 = func2;
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    return thread_execute(avctx, NULL, arg, ret, job_count, 0);
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}
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int ff_slice_thread_execute_with_mainfunc(AVCodecContext *avctx, action_func2* func2, main_func *mainfunc, void *arg, int *ret, int job_count)
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{
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    SliceThreadContext *c = avctx->internal->thread_ctx;
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    c->func2 = func2;
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    c->mainfunc = mainfunc;
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    return thread_execute(avctx, NULL, arg, ret, job_count, 0);
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}
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int ff_slice_thread_init(AVCodecContext *avctx)
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{
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    SliceThreadContext *c;
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    int thread_count = avctx->thread_count;
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    static void (*mainfunc)(void *);
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    // We cannot do this in the encoder init as the threads are created before
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    if (av_codec_is_encoder(avctx->codec) &&
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        avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO &&
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        avctx->height > 2800)
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        thread_count = avctx->thread_count = 1;
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    if (!thread_count) {
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        int nb_cpus = av_cpu_count();
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        if  (avctx->height)
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            nb_cpus = FFMIN(nb_cpus, (avctx->height+15)/16);
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        // use number of cores + 1 as thread count if there is more than one
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        if (nb_cpus > 1)
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            thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
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        else
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            thread_count = avctx->thread_count = 1;
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    }
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    if (thread_count <= 1) {
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        avctx->active_thread_type = 0;
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        return 0;
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    }
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    avctx->internal->thread_ctx = c = av_mallocz(sizeof(*c));
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    mainfunc = avctx->codec->caps_internal & FF_CODEC_CAP_SLICE_THREAD_HAS_MF ? &main_function : NULL;
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    if (!c || (thread_count = avpriv_slicethread_create(&c->thread, avctx, worker_func, mainfunc, thread_count)) <= 1) {
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        if (c)
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            avpriv_slicethread_free(&c->thread);
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        av_freep(&avctx->internal->thread_ctx);
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        avctx->thread_count = 1;
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        avctx->active_thread_type = 0;
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        return 0;
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    }
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    avctx->thread_count = thread_count;
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    avctx->execute = thread_execute;
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    avctx->execute2 = thread_execute2;
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    return 0;
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}
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void ff_thread_report_progress2(AVCodecContext *avctx, int field, int thread, int n)
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{
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    SliceThreadContext *p = avctx->internal->thread_ctx;
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    int *entries = p->entries;
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    pthread_mutex_lock(&p->progress_mutex[thread]);
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    entries[field] +=n;
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    pthread_cond_signal(&p->progress_cond[thread]);
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    pthread_mutex_unlock(&p->progress_mutex[thread]);
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}
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void ff_thread_await_progress2(AVCodecContext *avctx, int field, int thread, int shift)
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{
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    SliceThreadContext *p  = avctx->internal->thread_ctx;
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    int *entries      = p->entries;
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    if (!entries || !field) return;
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    thread = thread ? thread - 1 : p->thread_count - 1;
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    pthread_mutex_lock(&p->progress_mutex[thread]);
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    while ((entries[field - 1] - entries[field]) < shift){
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        pthread_cond_wait(&p->progress_cond[thread], &p->progress_mutex[thread]);
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    }
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    pthread_mutex_unlock(&p->progress_mutex[thread]);
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}
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int ff_alloc_entries(AVCodecContext *avctx, int count)
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{
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    int i;
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    if (avctx->active_thread_type & FF_THREAD_SLICE)  {
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        SliceThreadContext *p = avctx->internal->thread_ctx;
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        if (p->entries) {
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            av_assert0(p->thread_count == avctx->thread_count);
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            av_freep(&p->entries);
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        }
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        p->thread_count  = avctx->thread_count;
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        p->entries       = av_mallocz_array(count, sizeof(int));
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        if (!p->progress_mutex) {
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            p->progress_mutex = av_malloc_array(p->thread_count, sizeof(pthread_mutex_t));
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            p->progress_cond  = av_malloc_array(p->thread_count, sizeof(pthread_cond_t));
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        }
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        if (!p->entries || !p->progress_mutex || !p->progress_cond) {
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            av_freep(&p->entries);
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            av_freep(&p->progress_mutex);
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            av_freep(&p->progress_cond);
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            return AVERROR(ENOMEM);
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        }
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        p->entries_count  = count;
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        for (i = 0; i < p->thread_count; i++) {
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            pthread_mutex_init(&p->progress_mutex[i], NULL);
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            pthread_cond_init(&p->progress_cond[i], NULL);
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        }
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    }
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    return 0;
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}
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void ff_reset_entries(AVCodecContext *avctx)
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{
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    SliceThreadContext *p = avctx->internal->thread_ctx;
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    memset(p->entries, 0, p->entries_count * sizeof(int));
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}