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 <stdatomic.h>
23 #include "frame_thread_encoder.h"
25 #include "libavutil/fifo.h"
26 #include "libavutil/avassert.h"
27 #include "libavutil/imgutils.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/thread.h"
34 #define MAX_THREADS 64
35 #define BUFFER_SIZE (2*MAX_THREADS)
45 AVCodecContext *parent_avctx;
46 pthread_mutex_t buffer_mutex;
48 AVFifoBuffer *task_fifo;
49 pthread_mutex_t task_fifo_mutex;
50 pthread_cond_t task_fifo_cond;
52 Task finished_tasks[BUFFER_SIZE];
53 pthread_mutex_t finished_task_mutex;
54 pthread_cond_t finished_task_cond;
57 unsigned finished_task_index;
59 pthread_t worker[MAX_THREADS];
63 static void * attribute_align_arg worker(void *v){
64 AVCodecContext *avctx = v;
65 ThreadContext *c = avctx->internal->frame_thread_encoder;
68 while (!atomic_load(&c->exit)) {
73 if(!pkt) pkt = av_packet_alloc();
77 pthread_mutex_lock(&c->task_fifo_mutex);
78 while (av_fifo_size(c->task_fifo) <= 0 || atomic_load(&c->exit)) {
79 if (atomic_load(&c->exit)) {
80 pthread_mutex_unlock(&c->task_fifo_mutex);
83 pthread_cond_wait(&c->task_fifo_cond, &c->task_fifo_mutex);
85 av_fifo_generic_read(c->task_fifo, &task, sizeof(task), NULL);
86 pthread_mutex_unlock(&c->task_fifo_mutex);
89 ret = avcodec_encode_video2(avctx, pkt, frame, &got_packet);
90 pthread_mutex_lock(&c->buffer_mutex);
91 av_frame_unref(frame);
92 pthread_mutex_unlock(&c->buffer_mutex);
93 av_frame_free(&frame);
95 int ret2 = av_dup_packet(pkt);
96 if (ret >= 0 && ret2 < 0)
102 pthread_mutex_lock(&c->finished_task_mutex);
103 c->finished_tasks[task.index].outdata = pkt; pkt = NULL;
104 c->finished_tasks[task.index].return_code = ret;
105 pthread_cond_signal(&c->finished_task_cond);
106 pthread_mutex_unlock(&c->finished_task_mutex);
110 pthread_mutex_lock(&c->buffer_mutex);
111 avcodec_close(avctx);
112 pthread_mutex_unlock(&c->buffer_mutex);
117 int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){
122 if( !(avctx->thread_type & FF_THREAD_FRAME)
123 || !(avctx->codec->capabilities & AV_CODEC_CAP_INTRA_ONLY))
126 if( !avctx->thread_count
127 && avctx->codec_id == AV_CODEC_ID_MJPEG
128 && !(avctx->flags & AV_CODEC_FLAG_QSCALE)) {
129 av_log(avctx, AV_LOG_DEBUG,
130 "Forcing thread count to 1 for MJPEG encoding, use -thread_type slice "
131 "or a constant quantizer if you want to use multiple cpu cores\n");
132 avctx->thread_count = 1;
134 if( avctx->thread_count > 1
135 && avctx->codec_id == AV_CODEC_ID_MJPEG
136 && !(avctx->flags & AV_CODEC_FLAG_QSCALE))
137 av_log(avctx, AV_LOG_WARNING,
138 "MJPEG CBR encoding works badly with frame multi-threading, consider "
139 "using -threads 1, -thread_type slice or a constant quantizer.\n");
141 if (avctx->codec_id == AV_CODEC_ID_HUFFYUV ||
142 avctx->codec_id == AV_CODEC_ID_FFVHUFF) {
144 int context_model = 0;
145 AVDictionaryEntry *con = av_dict_get(options, "context", NULL, AV_DICT_MATCH_CASE);
147 if (con && con->value)
148 context_model = atoi(con->value);
150 if (avctx->flags & AV_CODEC_FLAG_PASS1)
152 else if(context_model > 0) {
153 AVDictionaryEntry *t = av_dict_get(options, "non_deterministic",
154 NULL, AV_DICT_MATCH_CASE);
155 warn = !t || !t->value || !atoi(t->value) ? 1 : 0;
157 // huffyuv does not support these with multiple frame threads currently
159 av_log(avctx, AV_LOG_WARNING,
160 "Forcing thread count to 1 for huffyuv encoding with first pass or context 1\n");
161 avctx->thread_count = 1;
165 if(!avctx->thread_count) {
166 avctx->thread_count = av_cpu_count();
167 avctx->thread_count = FFMIN(avctx->thread_count, MAX_THREADS);
170 if(avctx->thread_count <= 1)
173 if(avctx->thread_count > MAX_THREADS)
174 return AVERROR(EINVAL);
176 av_assert0(!avctx->internal->frame_thread_encoder);
177 c = avctx->internal->frame_thread_encoder = av_mallocz(sizeof(ThreadContext));
179 return AVERROR(ENOMEM);
181 c->parent_avctx = avctx;
183 c->task_fifo = av_fifo_alloc_array(BUFFER_SIZE, sizeof(Task));
187 pthread_mutex_init(&c->task_fifo_mutex, NULL);
188 pthread_mutex_init(&c->finished_task_mutex, NULL);
189 pthread_mutex_init(&c->buffer_mutex, NULL);
190 pthread_cond_init(&c->task_fifo_cond, NULL);
191 pthread_cond_init(&c->finished_task_cond, NULL);
192 atomic_init(&c->exit, 0);
194 for(i=0; i<avctx->thread_count ; i++){
195 AVDictionary *tmp = NULL;
198 AVCodecContext *thread_avctx = avcodec_alloc_context3(avctx->codec);
201 tmpv = thread_avctx->priv_data;
202 *thread_avctx = *avctx;
203 ret = av_opt_copy(thread_avctx, avctx);
206 thread_avctx->priv_data = tmpv;
207 thread_avctx->internal = NULL;
208 if (avctx->codec->priv_class) {
209 int ret = av_opt_copy(thread_avctx->priv_data, avctx->priv_data);
213 memcpy(thread_avctx->priv_data, avctx->priv_data, avctx->codec->priv_data_size);
214 thread_avctx->thread_count = 1;
215 thread_avctx->active_thread_type &= ~FF_THREAD_FRAME;
217 av_dict_copy(&tmp, options, 0);
218 av_dict_set(&tmp, "threads", "1", 0);
219 if(avcodec_open2(thread_avctx, avctx->codec, &tmp) < 0) {
224 av_assert0(!thread_avctx->internal->frame_thread_encoder);
225 thread_avctx->internal->frame_thread_encoder = c;
226 if(pthread_create(&c->worker[i], NULL, worker, thread_avctx)) {
231 avctx->active_thread_type = FF_THREAD_FRAME;
235 avctx->thread_count = i;
236 av_log(avctx, AV_LOG_ERROR, "ff_frame_thread_encoder_init failed\n");
237 ff_frame_thread_encoder_free(avctx);
241 void ff_frame_thread_encoder_free(AVCodecContext *avctx){
243 ThreadContext *c= avctx->internal->frame_thread_encoder;
245 pthread_mutex_lock(&c->task_fifo_mutex);
246 atomic_store(&c->exit, 1);
247 pthread_cond_broadcast(&c->task_fifo_cond);
248 pthread_mutex_unlock(&c->task_fifo_mutex);
250 for (i=0; i<avctx->thread_count; i++) {
251 pthread_join(c->worker[i], NULL);
254 pthread_mutex_destroy(&c->task_fifo_mutex);
255 pthread_mutex_destroy(&c->finished_task_mutex);
256 pthread_mutex_destroy(&c->buffer_mutex);
257 pthread_cond_destroy(&c->task_fifo_cond);
258 pthread_cond_destroy(&c->finished_task_cond);
259 av_fifo_freep(&c->task_fifo);
260 av_freep(&avctx->internal->frame_thread_encoder);
263 int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet_ptr){
264 ThreadContext *c = avctx->internal->frame_thread_encoder;
268 av_assert1(!*got_packet_ptr);
271 AVFrame *new = av_frame_alloc();
273 return AVERROR(ENOMEM);
274 ret = av_frame_ref(new, frame);
280 task.index = c->task_index;
281 task.indata = (void*)new;
282 pthread_mutex_lock(&c->task_fifo_mutex);
283 av_fifo_generic_write(c->task_fifo, &task, sizeof(task), NULL);
284 pthread_cond_signal(&c->task_fifo_cond);
285 pthread_mutex_unlock(&c->task_fifo_mutex);
287 c->task_index = (c->task_index+1) % BUFFER_SIZE;
290 pthread_mutex_lock(&c->finished_task_mutex);
291 if (c->task_index == c->finished_task_index ||
292 (frame && !c->finished_tasks[c->finished_task_index].outdata &&
293 (c->task_index - c->finished_task_index) % BUFFER_SIZE <= avctx->thread_count)) {
294 pthread_mutex_unlock(&c->finished_task_mutex);
298 while (!c->finished_tasks[c->finished_task_index].outdata) {
299 pthread_cond_wait(&c->finished_task_cond, &c->finished_task_mutex);
301 task = c->finished_tasks[c->finished_task_index];
302 *pkt = *(AVPacket*)(task.outdata);
305 av_freep(&c->finished_tasks[c->finished_task_index].outdata);
306 c->finished_task_index = (c->finished_task_index+1) % BUFFER_SIZE;
307 pthread_mutex_unlock(&c->finished_task_mutex);
309 return task.return_code;