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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 & CODEC_CAP_INTRA_ONLY))
  126.         return 0;
  127.  
  128.     if(!avctx->thread_count) {
  129.         avctx->thread_count = av_cpu_count();
  130.         avctx->thread_count = FFMIN(avctx->thread_count, MAX_THREADS);
  131.     }
  132.  
  133.     if(avctx->thread_count <= 1)
  134.         return 0;
  135.  
  136.     if(avctx->thread_count > MAX_THREADS)
  137.         return AVERROR(EINVAL);
  138.  
  139.     av_assert0(!avctx->internal->frame_thread_encoder);
  140.     c = avctx->internal->frame_thread_encoder = av_mallocz(sizeof(ThreadContext));
  141.     if(!c)
  142.         return AVERROR(ENOMEM);
  143.  
  144.     c->parent_avctx = avctx;
  145.  
  146.     c->task_fifo = av_fifo_alloc(sizeof(Task) * BUFFER_SIZE);
  147.     if(!c->task_fifo)
  148.         goto fail;
  149.  
  150.     pthread_mutex_init(&c->task_fifo_mutex, NULL);
  151.     pthread_mutex_init(&c->finished_task_mutex, NULL);
  152.     pthread_mutex_init(&c->buffer_mutex, NULL);
  153.     pthread_cond_init(&c->task_fifo_cond, NULL);
  154.     pthread_cond_init(&c->finished_task_cond, NULL);
  155.  
  156.     for(i=0; i<avctx->thread_count ; i++){
  157.         AVDictionary *tmp = NULL;
  158.         void *tmpv;
  159.         AVCodecContext *thread_avctx = avcodec_alloc_context3(avctx->codec);
  160.         if(!thread_avctx)
  161.             goto fail;
  162.         tmpv = thread_avctx->priv_data;
  163.         *thread_avctx = *avctx;
  164.         thread_avctx->priv_data = tmpv;
  165.         thread_avctx->internal = NULL;
  166.         memcpy(thread_avctx->priv_data, avctx->priv_data, avctx->codec->priv_data_size);
  167.         thread_avctx->thread_count = 1;
  168.         thread_avctx->active_thread_type &= ~FF_THREAD_FRAME;
  169.  
  170.         av_dict_copy(&tmp, options, 0);
  171.         av_dict_set(&tmp, "threads", "1", 0);
  172.         if(avcodec_open2(thread_avctx, avctx->codec, &tmp) < 0) {
  173.             av_dict_free(&tmp);
  174.             goto fail;
  175.         }
  176.         av_dict_free(&tmp);
  177.         av_assert0(!thread_avctx->internal->frame_thread_encoder);
  178.         thread_avctx->internal->frame_thread_encoder = c;
  179.         if(pthread_create(&c->worker[i], NULL, worker, thread_avctx)) {
  180.             goto fail;
  181.         }
  182.     }
  183.  
  184.     avctx->active_thread_type = FF_THREAD_FRAME;
  185.  
  186.     return 0;
  187. fail:
  188.     avctx->thread_count = i;
  189.     av_log(avctx, AV_LOG_ERROR, "ff_frame_thread_encoder_init failed\n");
  190.     ff_frame_thread_encoder_free(avctx);
  191.     return -1;
  192. }
  193.  
  194. void ff_frame_thread_encoder_free(AVCodecContext *avctx){
  195.     int i;
  196.     ThreadContext *c= avctx->internal->frame_thread_encoder;
  197.  
  198.     pthread_mutex_lock(&c->task_fifo_mutex);
  199.     c->exit = 1;
  200.     pthread_cond_broadcast(&c->task_fifo_cond);
  201.     pthread_mutex_unlock(&c->task_fifo_mutex);
  202.  
  203.     for (i=0; i<avctx->thread_count; i++) {
  204.          pthread_join(c->worker[i], NULL);
  205.     }
  206.  
  207.     pthread_mutex_destroy(&c->task_fifo_mutex);
  208.     pthread_mutex_destroy(&c->finished_task_mutex);
  209.     pthread_mutex_destroy(&c->buffer_mutex);
  210.     pthread_cond_destroy(&c->task_fifo_cond);
  211.     pthread_cond_destroy(&c->finished_task_cond);
  212.     av_fifo_free(c->task_fifo); c->task_fifo = NULL;
  213.     av_freep(&avctx->internal->frame_thread_encoder);
  214. }
  215.  
  216. int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet_ptr){
  217.     ThreadContext *c = avctx->internal->frame_thread_encoder;
  218.     Task task;
  219.     int ret;
  220.  
  221.     av_assert1(!*got_packet_ptr);
  222.  
  223.     if(frame){
  224.         if(!(avctx->flags & CODEC_FLAG_INPUT_PRESERVED)){
  225.             AVFrame *new = av_frame_alloc();
  226.             if(!new)
  227.                 return AVERROR(ENOMEM);
  228.             pthread_mutex_lock(&c->buffer_mutex);
  229.             ret = ff_get_buffer(c->parent_avctx, new, 0);
  230.             pthread_mutex_unlock(&c->buffer_mutex);
  231.             if(ret<0)
  232.                 return ret;
  233.             new->pts = frame->pts;
  234.             new->quality = frame->quality;
  235.             new->pict_type = frame->pict_type;
  236.             av_image_copy(new->data, new->linesize, (const uint8_t **)frame->data, frame->linesize,
  237.                           avctx->pix_fmt, avctx->width, avctx->height);
  238.             frame = new;
  239.         }
  240.  
  241.         task.index = c->task_index;
  242.         task.indata = (void*)frame;
  243.         pthread_mutex_lock(&c->task_fifo_mutex);
  244.         av_fifo_generic_write(c->task_fifo, &task, sizeof(task), NULL);
  245.         pthread_cond_signal(&c->task_fifo_cond);
  246.         pthread_mutex_unlock(&c->task_fifo_mutex);
  247.  
  248.         c->task_index = (c->task_index+1) % BUFFER_SIZE;
  249.  
  250.         if(!c->finished_tasks[c->finished_task_index].outdata && (c->task_index - c->finished_task_index) % BUFFER_SIZE <= avctx->thread_count)
  251.             return 0;
  252.     }
  253.  
  254.     if(c->task_index == c->finished_task_index)
  255.         return 0;
  256.  
  257.     pthread_mutex_lock(&c->finished_task_mutex);
  258.     while (!c->finished_tasks[c->finished_task_index].outdata) {
  259.         pthread_cond_wait(&c->finished_task_cond, &c->finished_task_mutex);
  260.     }
  261.     task = c->finished_tasks[c->finished_task_index];
  262.     *pkt = *(AVPacket*)(task.outdata);
  263.     if(pkt->data)
  264.         *got_packet_ptr = 1;
  265.     av_freep(&c->finished_tasks[c->finished_task_index].outdata);
  266.     c->finished_task_index = (c->finished_task_index+1) % BUFFER_SIZE;
  267.     pthread_mutex_unlock(&c->finished_task_mutex);
  268.  
  269.     return task.return_code;
  270. }
  271.