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  1. /*
  2.  * Copyright (c) 2012 Michael Niedermayer <michaelni@gmx.at>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include "frame_thread_encoder.h"
  22.  
  23. #include "libavutil/fifo.h"
  24. #include "libavutil/avassert.h"
  25. #include "libavutil/imgutils.h"
  26. #include "avcodec.h"
  27. #include "internal.h"
  28. #include "thread.h"
  29.  
  30. #if HAVE_PTHREADS
  31. #include <pthread.h>
  32. #elif HAVE_W32THREADS
  33. #include "compat/w32pthreads.h"
  34. #elif HAVE_OS2THREADS
  35. #include "compat/os2threads.h"
  36. #endif
  37.  
  38. #define MAX_THREADS 64
  39. #define BUFFER_SIZE (2*MAX_THREADS)
  40.  
  41. typedef struct{
  42.     void *indata;
  43.     void *outdata;
  44.     int64_t return_code;
  45.     unsigned index;
  46. } Task;
  47.  
  48. typedef struct{
  49.     AVCodecContext *parent_avctx;
  50.     pthread_mutex_t buffer_mutex;
  51.  
  52.     AVFifoBuffer *task_fifo;
  53.     pthread_mutex_t task_fifo_mutex;
  54.     pthread_cond_t task_fifo_cond;
  55.  
  56.     Task finished_tasks[BUFFER_SIZE];
  57.     pthread_mutex_t finished_task_mutex;
  58.     pthread_cond_t finished_task_cond;
  59.  
  60.     unsigned task_index;
  61.     unsigned finished_task_index;
  62.  
  63.     pthread_t worker[MAX_THREADS];
  64.     int exit;
  65. } ThreadContext;
  66.  
  67. static void * attribute_align_arg worker(void *v){
  68.     AVCodecContext *avctx = v;
  69.     ThreadContext *c = avctx->internal->frame_thread_encoder;
  70.     AVPacket *pkt = NULL;
  71.  
  72.     while(!c->exit){
  73.         int got_packet, ret;
  74.         AVFrame *frame;
  75.         Task task;
  76.  
  77.         if(!pkt) pkt= av_mallocz(sizeof(*pkt));
  78.         if(!pkt) continue;
  79.         av_init_packet(pkt);
  80.  
  81.         pthread_mutex_lock(&c->task_fifo_mutex);
  82.         while (av_fifo_size(c->task_fifo) <= 0 || c->exit) {
  83.             if(c->exit){
  84.                 pthread_mutex_unlock(&c->task_fifo_mutex);
  85.                 goto end;
  86.             }
  87.             pthread_cond_wait(&c->task_fifo_cond, &c->task_fifo_mutex);
  88.         }
  89.         av_fifo_generic_read(c->task_fifo, &task, sizeof(task), NULL);
  90.         pthread_mutex_unlock(&c->task_fifo_mutex);
  91.         frame = task.indata;
  92.  
  93.         ret = avcodec_encode_video2(avctx, pkt, frame, &got_packet);
  94.         pthread_mutex_lock(&c->buffer_mutex);
  95.         av_frame_unref(frame);
  96.         pthread_mutex_unlock(&c->buffer_mutex);
  97.         av_frame_free(&frame);
  98.         if(got_packet) {
  99.             av_dup_packet(pkt);
  100.         } else {
  101.             pkt->data = NULL;
  102.             pkt->size = 0;
  103.         }
  104.         pthread_mutex_lock(&c->finished_task_mutex);
  105.         c->finished_tasks[task.index].outdata = pkt; pkt = NULL;
  106.         c->finished_tasks[task.index].return_code = ret;
  107.         pthread_cond_signal(&c->finished_task_cond);
  108.         pthread_mutex_unlock(&c->finished_task_mutex);
  109.     }
  110. end:
  111.     av_free(pkt);
  112.     pthread_mutex_lock(&c->buffer_mutex);
  113.     avcodec_close(avctx);
  114.     pthread_mutex_unlock(&c->buffer_mutex);
  115.     av_freep(&avctx);
  116.     return NULL;
  117. }
  118.  
  119. int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){
  120.     int i=0;
  121.     ThreadContext *c;
  122.  
  123.  
  124.     if(   !(avctx->thread_type & FF_THREAD_FRAME)
  125.        || !(avctx->codec->capabilities & AV_CODEC_CAP_INTRA_ONLY))
  126.         return 0;
  127.  
  128.     if(   !avctx->thread_count
  129.        && avctx->codec_id == AV_CODEC_ID_MJPEG
  130.        && !(avctx->flags & AV_CODEC_FLAG_QSCALE)) {
  131.         av_log(avctx, AV_LOG_DEBUG,
  132.                "Forcing thread count to 1 for MJPEG encoding, use -thread_type slice "
  133.                "or a constant quantizer if you want to use multiple cpu cores\n");
  134.         avctx->thread_count = 1;
  135.     }
  136.     if(   avctx->thread_count > 1
  137.        && avctx->codec_id == AV_CODEC_ID_MJPEG
  138.        && !(avctx->flags & AV_CODEC_FLAG_QSCALE))
  139.         av_log(avctx, AV_LOG_WARNING,
  140.                "MJPEG CBR encoding works badly with frame multi-threading, consider "
  141.                "using -threads 1, -thread_type slice or a constant quantizer.\n");
  142.  
  143.     if (avctx->codec_id == AV_CODEC_ID_HUFFYUV ||
  144.         avctx->codec_id == AV_CODEC_ID_FFVHUFF) {
  145.         int warn = 0;
  146.         if (avctx->flags & AV_CODEC_FLAG_PASS1)
  147.             warn = 1;
  148.         else if(avctx->context_model > 0) {
  149.             AVDictionaryEntry *t = av_dict_get(options, "non_deterministic",
  150.                                                NULL, AV_DICT_MATCH_CASE);
  151.             warn = !t || !t->value || !atoi(t->value) ? 1 : 0;
  152.         }
  153.         // huffyuv does not support these with multiple frame threads currently
  154.         if (warn) {
  155.             av_log(avctx, AV_LOG_WARNING,
  156.                "Forcing thread count to 1 for huffyuv encoding with first pass or context 1\n");
  157.             avctx->thread_count = 1;
  158.         }
  159.     }
  160.  
  161.     if(!avctx->thread_count) {
  162.         avctx->thread_count = av_cpu_count();
  163.         avctx->thread_count = FFMIN(avctx->thread_count, MAX_THREADS);
  164.     }
  165.  
  166.     if(avctx->thread_count <= 1)
  167.         return 0;
  168.  
  169.     if(avctx->thread_count > MAX_THREADS)
  170.         return AVERROR(EINVAL);
  171.  
  172.     av_assert0(!avctx->internal->frame_thread_encoder);
  173.     c = avctx->internal->frame_thread_encoder = av_mallocz(sizeof(ThreadContext));
  174.     if(!c)
  175.         return AVERROR(ENOMEM);
  176.  
  177.     c->parent_avctx = avctx;
  178.  
  179.     c->task_fifo = av_fifo_alloc_array(BUFFER_SIZE, sizeof(Task));
  180.     if(!c->task_fifo)
  181.         goto fail;
  182.  
  183.     pthread_mutex_init(&c->task_fifo_mutex, NULL);
  184.     pthread_mutex_init(&c->finished_task_mutex, NULL);
  185.     pthread_mutex_init(&c->buffer_mutex, NULL);
  186.     pthread_cond_init(&c->task_fifo_cond, NULL);
  187.     pthread_cond_init(&c->finished_task_cond, NULL);
  188.  
  189.     for(i=0; i<avctx->thread_count ; i++){
  190.         AVDictionary *tmp = NULL;
  191.         void *tmpv;
  192.         AVCodecContext *thread_avctx = avcodec_alloc_context3(avctx->codec);
  193.         if(!thread_avctx)
  194.             goto fail;
  195.         tmpv = thread_avctx->priv_data;
  196.         *thread_avctx = *avctx;
  197.         thread_avctx->priv_data = tmpv;
  198.         thread_avctx->internal = NULL;
  199.         memcpy(thread_avctx->priv_data, avctx->priv_data, avctx->codec->priv_data_size);
  200.         thread_avctx->thread_count = 1;
  201.         thread_avctx->active_thread_type &= ~FF_THREAD_FRAME;
  202.  
  203.         av_dict_copy(&tmp, options, 0);
  204.         av_dict_set(&tmp, "threads", "1", 0);
  205.         if(avcodec_open2(thread_avctx, avctx->codec, &tmp) < 0) {
  206.             av_dict_free(&tmp);
  207.             goto fail;
  208.         }
  209.         av_dict_free(&tmp);
  210.         av_assert0(!thread_avctx->internal->frame_thread_encoder);
  211.         thread_avctx->internal->frame_thread_encoder = c;
  212.         if(pthread_create(&c->worker[i], NULL, worker, thread_avctx)) {
  213.             goto fail;
  214.         }
  215.     }
  216.  
  217.     avctx->active_thread_type = FF_THREAD_FRAME;
  218.  
  219.     return 0;
  220. fail:
  221.     avctx->thread_count = i;
  222.     av_log(avctx, AV_LOG_ERROR, "ff_frame_thread_encoder_init failed\n");
  223.     ff_frame_thread_encoder_free(avctx);
  224.     return -1;
  225. }
  226.  
  227. void ff_frame_thread_encoder_free(AVCodecContext *avctx){
  228.     int i;
  229.     ThreadContext *c= avctx->internal->frame_thread_encoder;
  230.  
  231.     pthread_mutex_lock(&c->task_fifo_mutex);
  232.     c->exit = 1;
  233.     pthread_cond_broadcast(&c->task_fifo_cond);
  234.     pthread_mutex_unlock(&c->task_fifo_mutex);
  235.  
  236.     for (i=0; i<avctx->thread_count; i++) {
  237.          pthread_join(c->worker[i], NULL);
  238.     }
  239.  
  240.     pthread_mutex_destroy(&c->task_fifo_mutex);
  241.     pthread_mutex_destroy(&c->finished_task_mutex);
  242.     pthread_mutex_destroy(&c->buffer_mutex);
  243.     pthread_cond_destroy(&c->task_fifo_cond);
  244.     pthread_cond_destroy(&c->finished_task_cond);
  245.     av_fifo_freep(&c->task_fifo);
  246.     av_freep(&avctx->internal->frame_thread_encoder);
  247. }
  248.  
  249. int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet_ptr){
  250.     ThreadContext *c = avctx->internal->frame_thread_encoder;
  251.     Task task;
  252.     int ret;
  253.  
  254.     av_assert1(!*got_packet_ptr);
  255.  
  256.     if(frame){
  257.         AVFrame *new = av_frame_alloc();
  258.         if(!new)
  259.             return AVERROR(ENOMEM);
  260.         ret = av_frame_ref(new, frame);
  261.         if(ret < 0) {
  262.             av_frame_free(&new);
  263.             return ret;
  264.         }
  265.  
  266.         task.index = c->task_index;
  267.         task.indata = (void*)new;
  268.         pthread_mutex_lock(&c->task_fifo_mutex);
  269.         av_fifo_generic_write(c->task_fifo, &task, sizeof(task), NULL);
  270.         pthread_cond_signal(&c->task_fifo_cond);
  271.         pthread_mutex_unlock(&c->task_fifo_mutex);
  272.  
  273.         c->task_index = (c->task_index+1) % BUFFER_SIZE;
  274.  
  275.         if(!c->finished_tasks[c->finished_task_index].outdata && (c->task_index - c->finished_task_index) % BUFFER_SIZE <= avctx->thread_count)
  276.             return 0;
  277.     }
  278.  
  279.     if(c->task_index == c->finished_task_index)
  280.         return 0;
  281.  
  282.     pthread_mutex_lock(&c->finished_task_mutex);
  283.     while (!c->finished_tasks[c->finished_task_index].outdata) {
  284.         pthread_cond_wait(&c->finished_task_cond, &c->finished_task_mutex);
  285.     }
  286.     task = c->finished_tasks[c->finished_task_index];
  287.     *pkt = *(AVPacket*)(task.outdata);
  288.     if(pkt->data)
  289.         *got_packet_ptr = 1;
  290.     av_freep(&c->finished_tasks[c->finished_task_index].outdata);
  291.     c->finished_task_index = (c->finished_task_index+1) % BUFFER_SIZE;
  292.     pthread_mutex_unlock(&c->finished_task_mutex);
  293.  
  294.     return task.return_code;
  295. }
  296.