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"
26 #include "libavutil/thread.h"
31 #define MAX_THREADS 64
32 #define BUFFER_SIZE (2*MAX_THREADS)
42 AVCodecContext *parent_avctx;
43 pthread_mutex_t buffer_mutex;
45 AVFifoBuffer *task_fifo;
46 pthread_mutex_t task_fifo_mutex;
47 pthread_cond_t task_fifo_cond;
49 Task finished_tasks[BUFFER_SIZE];
50 pthread_mutex_t finished_task_mutex;
51 pthread_cond_t finished_task_cond;
54 unsigned finished_task_index;
56 pthread_t worker[MAX_THREADS];
60 static void * attribute_align_arg worker(void *v){
61 AVCodecContext *avctx = v;
62 ThreadContext *c = avctx->internal->frame_thread_encoder;
70 if(!pkt) pkt= av_mallocz(sizeof(*pkt));
74 pthread_mutex_lock(&c->task_fifo_mutex);
75 while (av_fifo_size(c->task_fifo) <= 0 || c->exit) {
77 pthread_mutex_unlock(&c->task_fifo_mutex);
80 pthread_cond_wait(&c->task_fifo_cond, &c->task_fifo_mutex);
82 av_fifo_generic_read(c->task_fifo, &task, sizeof(task), NULL);
83 pthread_mutex_unlock(&c->task_fifo_mutex);
86 ret = avcodec_encode_video2(avctx, pkt, frame, &got_packet);
87 pthread_mutex_lock(&c->buffer_mutex);
88 av_frame_unref(frame);
89 pthread_mutex_unlock(&c->buffer_mutex);
90 av_frame_free(&frame);
97 pthread_mutex_lock(&c->finished_task_mutex);
98 c->finished_tasks[task.index].outdata = pkt; pkt = NULL;
99 c->finished_tasks[task.index].return_code = ret;
100 pthread_cond_signal(&c->finished_task_cond);
101 pthread_mutex_unlock(&c->finished_task_mutex);
105 pthread_mutex_lock(&c->buffer_mutex);
106 avcodec_close(avctx);
107 pthread_mutex_unlock(&c->buffer_mutex);
112 int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){
117 if( !(avctx->thread_type & FF_THREAD_FRAME)
118 || !(avctx->codec->capabilities & AV_CODEC_CAP_INTRA_ONLY))
121 if( !avctx->thread_count
122 && avctx->codec_id == AV_CODEC_ID_MJPEG
123 && !(avctx->flags & AV_CODEC_FLAG_QSCALE)) {
124 av_log(avctx, AV_LOG_DEBUG,
125 "Forcing thread count to 1 for MJPEG encoding, use -thread_type slice "
126 "or a constant quantizer if you want to use multiple cpu cores\n");
127 avctx->thread_count = 1;
129 if( avctx->thread_count > 1
130 && avctx->codec_id == AV_CODEC_ID_MJPEG
131 && !(avctx->flags & AV_CODEC_FLAG_QSCALE))
132 av_log(avctx, AV_LOG_WARNING,
133 "MJPEG CBR encoding works badly with frame multi-threading, consider "
134 "using -threads 1, -thread_type slice or a constant quantizer.\n");
136 if (avctx->codec_id == AV_CODEC_ID_HUFFYUV ||
137 avctx->codec_id == AV_CODEC_ID_FFVHUFF) {
139 if (avctx->flags & AV_CODEC_FLAG_PASS1)
141 else if(avctx->context_model > 0) {
142 AVDictionaryEntry *t = av_dict_get(options, "non_deterministic",
143 NULL, AV_DICT_MATCH_CASE);
144 warn = !t || !t->value || !atoi(t->value) ? 1 : 0;
146 // huffyuv does not support these with multiple frame threads currently
148 av_log(avctx, AV_LOG_WARNING,
149 "Forcing thread count to 1 for huffyuv encoding with first pass or context 1\n");
150 avctx->thread_count = 1;
154 if(!avctx->thread_count) {
155 avctx->thread_count = av_cpu_count();
156 avctx->thread_count = FFMIN(avctx->thread_count, MAX_THREADS);
159 if(avctx->thread_count <= 1)
162 if(avctx->thread_count > MAX_THREADS)
163 return AVERROR(EINVAL);
165 av_assert0(!avctx->internal->frame_thread_encoder);
166 c = avctx->internal->frame_thread_encoder = av_mallocz(sizeof(ThreadContext));
168 return AVERROR(ENOMEM);
170 c->parent_avctx = avctx;
172 c->task_fifo = av_fifo_alloc_array(BUFFER_SIZE, sizeof(Task));
176 pthread_mutex_init(&c->task_fifo_mutex, NULL);
177 pthread_mutex_init(&c->finished_task_mutex, NULL);
178 pthread_mutex_init(&c->buffer_mutex, NULL);
179 pthread_cond_init(&c->task_fifo_cond, NULL);
180 pthread_cond_init(&c->finished_task_cond, NULL);
182 for(i=0; i<avctx->thread_count ; i++){
183 AVDictionary *tmp = NULL;
185 AVCodecContext *thread_avctx = avcodec_alloc_context3(avctx->codec);
188 tmpv = thread_avctx->priv_data;
189 *thread_avctx = *avctx;
190 thread_avctx->priv_data = tmpv;
191 thread_avctx->internal = NULL;
192 memcpy(thread_avctx->priv_data, avctx->priv_data, avctx->codec->priv_data_size);
193 thread_avctx->thread_count = 1;
194 thread_avctx->active_thread_type &= ~FF_THREAD_FRAME;
196 av_dict_copy(&tmp, options, 0);
197 av_dict_set(&tmp, "threads", "1", 0);
198 if(avcodec_open2(thread_avctx, avctx->codec, &tmp) < 0) {
203 av_assert0(!thread_avctx->internal->frame_thread_encoder);
204 thread_avctx->internal->frame_thread_encoder = c;
205 if(pthread_create(&c->worker[i], NULL, worker, thread_avctx)) {
210 avctx->active_thread_type = FF_THREAD_FRAME;
214 avctx->thread_count = i;
215 av_log(avctx, AV_LOG_ERROR, "ff_frame_thread_encoder_init failed\n");
216 ff_frame_thread_encoder_free(avctx);
220 void ff_frame_thread_encoder_free(AVCodecContext *avctx){
222 ThreadContext *c= avctx->internal->frame_thread_encoder;
224 pthread_mutex_lock(&c->task_fifo_mutex);
226 pthread_cond_broadcast(&c->task_fifo_cond);
227 pthread_mutex_unlock(&c->task_fifo_mutex);
229 for (i=0; i<avctx->thread_count; i++) {
230 pthread_join(c->worker[i], NULL);
233 pthread_mutex_destroy(&c->task_fifo_mutex);
234 pthread_mutex_destroy(&c->finished_task_mutex);
235 pthread_mutex_destroy(&c->buffer_mutex);
236 pthread_cond_destroy(&c->task_fifo_cond);
237 pthread_cond_destroy(&c->finished_task_cond);
238 av_fifo_freep(&c->task_fifo);
239 av_freep(&avctx->internal->frame_thread_encoder);
242 int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet_ptr){
243 ThreadContext *c = avctx->internal->frame_thread_encoder;
247 av_assert1(!*got_packet_ptr);
250 AVFrame *new = av_frame_alloc();
252 return AVERROR(ENOMEM);
253 ret = av_frame_ref(new, frame);
259 task.index = c->task_index;
260 task.indata = (void*)new;
261 pthread_mutex_lock(&c->task_fifo_mutex);
262 av_fifo_generic_write(c->task_fifo, &task, sizeof(task), NULL);
263 pthread_cond_signal(&c->task_fifo_cond);
264 pthread_mutex_unlock(&c->task_fifo_mutex);
266 c->task_index = (c->task_index+1) % BUFFER_SIZE;
268 if(!c->finished_tasks[c->finished_task_index].outdata && (c->task_index - c->finished_task_index) % BUFFER_SIZE <= avctx->thread_count)
272 if(c->task_index == c->finished_task_index)
275 pthread_mutex_lock(&c->finished_task_mutex);
276 while (!c->finished_tasks[c->finished_task_index].outdata) {
277 pthread_cond_wait(&c->finished_task_cond, &c->finished_task_mutex);
279 task = c->finished_tasks[c->finished_task_index];
280 *pkt = *(AVPacket*)(task.outdata);
283 av_freep(&c->finished_tasks[c->finished_task_index].outdata);
284 c->finished_task_index = (c->finished_task_index+1) % BUFFER_SIZE;
285 pthread_mutex_unlock(&c->finished_task_mutex);
287 return task.return_code;