2 * Copyright (c) 2012 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "frame_thread_encoder.h"
23 #include "libavutil/fifo.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/imgutils.h"
33 #include "compat/w32pthreads.h"
35 #include "compat/os2threads.h"
38 #define MAX_THREADS 64
39 #define BUFFER_SIZE (2*MAX_THREADS)
49 AVCodecContext *parent_avctx;
50 pthread_mutex_t buffer_mutex;
52 AVFifoBuffer *task_fifo;
53 pthread_mutex_t task_fifo_mutex;
54 pthread_cond_t task_fifo_cond;
56 Task finished_tasks[BUFFER_SIZE];
57 pthread_mutex_t finished_task_mutex;
58 pthread_cond_t finished_task_cond;
61 unsigned finished_task_index;
63 pthread_t worker[MAX_THREADS];
67 static void * attribute_align_arg worker(void *v){
68 AVCodecContext *avctx = v;
69 ThreadContext *c = avctx->internal->frame_thread_encoder;
77 if(!pkt) pkt= av_mallocz(sizeof(*pkt));
81 pthread_mutex_lock(&c->task_fifo_mutex);
82 while (av_fifo_size(c->task_fifo) <= 0 || c->exit) {
84 pthread_mutex_unlock(&c->task_fifo_mutex);
87 pthread_cond_wait(&c->task_fifo_cond, &c->task_fifo_mutex);
89 av_fifo_generic_read(c->task_fifo, &task, sizeof(task), NULL);
90 pthread_mutex_unlock(&c->task_fifo_mutex);
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);
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);
112 pthread_mutex_lock(&c->buffer_mutex);
113 avcodec_close(avctx);
114 pthread_mutex_unlock(&c->buffer_mutex);
119 int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){
124 if( !(avctx->thread_type & FF_THREAD_FRAME)
125 || !(avctx->codec->capabilities & AV_CODEC_CAP_INTRA_ONLY))
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;
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");
143 if (avctx->codec_id == AV_CODEC_ID_HUFFYUV ||
144 avctx->codec_id == AV_CODEC_ID_FFVHUFF) {
146 if (avctx->flags & AV_CODEC_FLAG_PASS1)
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;
153 // huffyuv does not support these with multiple frame threads currently
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;
161 if(!avctx->thread_count) {
162 avctx->thread_count = av_cpu_count();
163 avctx->thread_count = FFMIN(avctx->thread_count, MAX_THREADS);
166 if(avctx->thread_count <= 1)
169 if(avctx->thread_count > MAX_THREADS)
170 return AVERROR(EINVAL);
172 av_assert0(!avctx->internal->frame_thread_encoder);
173 c = avctx->internal->frame_thread_encoder = av_mallocz(sizeof(ThreadContext));
175 return AVERROR(ENOMEM);
177 c->parent_avctx = avctx;
179 c->task_fifo = av_fifo_alloc_array(BUFFER_SIZE, sizeof(Task));
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);
189 for(i=0; i<avctx->thread_count ; i++){
190 AVDictionary *tmp = NULL;
192 AVCodecContext *thread_avctx = avcodec_alloc_context3(avctx->codec);
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;
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) {
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)) {
217 avctx->active_thread_type = FF_THREAD_FRAME;
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);
227 void ff_frame_thread_encoder_free(AVCodecContext *avctx){
229 ThreadContext *c= avctx->internal->frame_thread_encoder;
231 pthread_mutex_lock(&c->task_fifo_mutex);
233 pthread_cond_broadcast(&c->task_fifo_cond);
234 pthread_mutex_unlock(&c->task_fifo_mutex);
236 for (i=0; i<avctx->thread_count; i++) {
237 pthread_join(c->worker[i], NULL);
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);
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;
254 av_assert1(!*got_packet_ptr);
257 AVFrame *new = av_frame_alloc();
259 return AVERROR(ENOMEM);
260 ret = av_frame_ref(new, frame);
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);
273 c->task_index = (c->task_index+1) % BUFFER_SIZE;
275 if(!c->finished_tasks[c->finished_task_index].outdata && (c->task_index - c->finished_task_index) % BUFFER_SIZE <= avctx->thread_count)
279 if(c->task_index == c->finished_task_index)
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);
286 task = c->finished_tasks[c->finished_task_index];
287 *pkt = *(AVPacket*)(task.outdata);
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);
294 return task.return_code;