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);
92 int ret2 = av_dup_packet(pkt);
93 if (ret >= 0 && ret2 < 0)
99 pthread_mutex_lock(&c->finished_task_mutex);
100 c->finished_tasks[task.index].outdata = pkt; pkt = NULL;
101 c->finished_tasks[task.index].return_code = ret;
102 pthread_cond_signal(&c->finished_task_cond);
103 pthread_mutex_unlock(&c->finished_task_mutex);
107 pthread_mutex_lock(&c->buffer_mutex);
108 avcodec_close(avctx);
109 pthread_mutex_unlock(&c->buffer_mutex);
114 int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){
119 if( !(avctx->thread_type & FF_THREAD_FRAME)
120 || !(avctx->codec->capabilities & AV_CODEC_CAP_INTRA_ONLY))
123 if( !avctx->thread_count
124 && avctx->codec_id == AV_CODEC_ID_MJPEG
125 && !(avctx->flags & AV_CODEC_FLAG_QSCALE)) {
126 av_log(avctx, AV_LOG_DEBUG,
127 "Forcing thread count to 1 for MJPEG encoding, use -thread_type slice "
128 "or a constant quantizer if you want to use multiple cpu cores\n");
129 avctx->thread_count = 1;
131 if( avctx->thread_count > 1
132 && avctx->codec_id == AV_CODEC_ID_MJPEG
133 && !(avctx->flags & AV_CODEC_FLAG_QSCALE))
134 av_log(avctx, AV_LOG_WARNING,
135 "MJPEG CBR encoding works badly with frame multi-threading, consider "
136 "using -threads 1, -thread_type slice or a constant quantizer.\n");
138 if (avctx->codec_id == AV_CODEC_ID_HUFFYUV ||
139 avctx->codec_id == AV_CODEC_ID_FFVHUFF) {
141 int context_model = 0;
142 AVDictionaryEntry *con = av_dict_get(options, "context", NULL, AV_DICT_MATCH_CASE);
144 if (con && con->value)
145 context_model = atoi(con->value);
147 if (avctx->flags & AV_CODEC_FLAG_PASS1)
149 else if(context_model > 0) {
150 AVDictionaryEntry *t = av_dict_get(options, "non_deterministic",
151 NULL, AV_DICT_MATCH_CASE);
152 warn = !t || !t->value || !atoi(t->value) ? 1 : 0;
154 // huffyuv does not support these with multiple frame threads currently
156 av_log(avctx, AV_LOG_WARNING,
157 "Forcing thread count to 1 for huffyuv encoding with first pass or context 1\n");
158 avctx->thread_count = 1;
162 if(!avctx->thread_count) {
163 avctx->thread_count = av_cpu_count();
164 avctx->thread_count = FFMIN(avctx->thread_count, MAX_THREADS);
167 if(avctx->thread_count <= 1)
170 if(avctx->thread_count > MAX_THREADS)
171 return AVERROR(EINVAL);
173 av_assert0(!avctx->internal->frame_thread_encoder);
174 c = avctx->internal->frame_thread_encoder = av_mallocz(sizeof(ThreadContext));
176 return AVERROR(ENOMEM);
178 c->parent_avctx = avctx;
180 c->task_fifo = av_fifo_alloc_array(BUFFER_SIZE, sizeof(Task));
184 pthread_mutex_init(&c->task_fifo_mutex, NULL);
185 pthread_mutex_init(&c->finished_task_mutex, NULL);
186 pthread_mutex_init(&c->buffer_mutex, NULL);
187 pthread_cond_init(&c->task_fifo_cond, NULL);
188 pthread_cond_init(&c->finished_task_cond, NULL);
190 for(i=0; i<avctx->thread_count ; i++){
191 AVDictionary *tmp = NULL;
193 AVCodecContext *thread_avctx = avcodec_alloc_context3(avctx->codec);
196 tmpv = thread_avctx->priv_data;
197 *thread_avctx = *avctx;
198 thread_avctx->priv_data = tmpv;
199 thread_avctx->internal = NULL;
200 memcpy(thread_avctx->priv_data, avctx->priv_data, avctx->codec->priv_data_size);
201 thread_avctx->thread_count = 1;
202 thread_avctx->active_thread_type &= ~FF_THREAD_FRAME;
204 av_dict_copy(&tmp, options, 0);
205 av_dict_set(&tmp, "threads", "1", 0);
206 if(avcodec_open2(thread_avctx, avctx->codec, &tmp) < 0) {
211 av_assert0(!thread_avctx->internal->frame_thread_encoder);
212 thread_avctx->internal->frame_thread_encoder = c;
213 if(pthread_create(&c->worker[i], NULL, worker, thread_avctx)) {
218 avctx->active_thread_type = FF_THREAD_FRAME;
222 avctx->thread_count = i;
223 av_log(avctx, AV_LOG_ERROR, "ff_frame_thread_encoder_init failed\n");
224 ff_frame_thread_encoder_free(avctx);
228 void ff_frame_thread_encoder_free(AVCodecContext *avctx){
230 ThreadContext *c= avctx->internal->frame_thread_encoder;
232 pthread_mutex_lock(&c->task_fifo_mutex);
234 pthread_cond_broadcast(&c->task_fifo_cond);
235 pthread_mutex_unlock(&c->task_fifo_mutex);
237 for (i=0; i<avctx->thread_count; i++) {
238 pthread_join(c->worker[i], NULL);
241 pthread_mutex_destroy(&c->task_fifo_mutex);
242 pthread_mutex_destroy(&c->finished_task_mutex);
243 pthread_mutex_destroy(&c->buffer_mutex);
244 pthread_cond_destroy(&c->task_fifo_cond);
245 pthread_cond_destroy(&c->finished_task_cond);
246 av_fifo_freep(&c->task_fifo);
247 av_freep(&avctx->internal->frame_thread_encoder);
250 int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet_ptr){
251 ThreadContext *c = avctx->internal->frame_thread_encoder;
255 av_assert1(!*got_packet_ptr);
258 AVFrame *new = av_frame_alloc();
260 return AVERROR(ENOMEM);
261 ret = av_frame_ref(new, frame);
267 task.index = c->task_index;
268 task.indata = (void*)new;
269 pthread_mutex_lock(&c->task_fifo_mutex);
270 av_fifo_generic_write(c->task_fifo, &task, sizeof(task), NULL);
271 pthread_cond_signal(&c->task_fifo_cond);
272 pthread_mutex_unlock(&c->task_fifo_mutex);
274 c->task_index = (c->task_index+1) % BUFFER_SIZE;
276 if(!c->finished_tasks[c->finished_task_index].outdata && (c->task_index - c->finished_task_index) % BUFFER_SIZE <= avctx->thread_count)
280 if(c->task_index == c->finished_task_index)
283 pthread_mutex_lock(&c->finished_task_mutex);
284 while (!c->finished_tasks[c->finished_task_index].outdata) {
285 pthread_cond_wait(&c->finished_task_cond, &c->finished_task_mutex);
287 task = c->finished_tasks[c->finished_task_index];
288 *pkt = *(AVPacket*)(task.outdata);
291 av_freep(&c->finished_tasks[c->finished_task_index].outdata);
292 c->finished_task_index = (c->finished_task_index+1) % BUFFER_SIZE;
293 pthread_mutex_unlock(&c->finished_task_mutex);
295 return task.return_code;