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path: root/libavcodec/frame_thread_encoder.c (plain)
blob: 27ae356af30a7f5661114813079392ae037daf8d
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 "libavutil/thread.h"
27#include "avcodec.h"
28#include "internal.h"
29#include "thread.h"
30
31#define MAX_THREADS 64
32#define BUFFER_SIZE (2*MAX_THREADS)
33
34typedef struct{
35 void *indata;
36 void *outdata;
37 int64_t return_code;
38 unsigned index;
39} Task;
40
41typedef struct{
42 AVCodecContext *parent_avctx;
43 pthread_mutex_t buffer_mutex;
44
45 AVFifoBuffer *task_fifo;
46 pthread_mutex_t task_fifo_mutex;
47 pthread_cond_t task_fifo_cond;
48
49 Task finished_tasks[BUFFER_SIZE];
50 pthread_mutex_t finished_task_mutex;
51 pthread_cond_t finished_task_cond;
52
53 unsigned task_index;
54 unsigned finished_task_index;
55
56 pthread_t worker[MAX_THREADS];
57 int exit;
58} ThreadContext;
59
60static void * attribute_align_arg worker(void *v){
61 AVCodecContext *avctx = v;
62 ThreadContext *c = avctx->internal->frame_thread_encoder;
63 AVPacket *pkt = NULL;
64
65 while(!c->exit){
66 int got_packet, ret;
67 AVFrame *frame;
68 Task task;
69
70 if(!pkt) pkt= av_mallocz(sizeof(*pkt));
71 if(!pkt) continue;
72 av_init_packet(pkt);
73
74 pthread_mutex_lock(&c->task_fifo_mutex);
75 while (av_fifo_size(c->task_fifo) <= 0 || c->exit) {
76 if(c->exit){
77 pthread_mutex_unlock(&c->task_fifo_mutex);
78 goto end;
79 }
80 pthread_cond_wait(&c->task_fifo_cond, &c->task_fifo_mutex);
81 }
82 av_fifo_generic_read(c->task_fifo, &task, sizeof(task), NULL);
83 pthread_mutex_unlock(&c->task_fifo_mutex);
84 frame = task.indata;
85
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);
91 if(got_packet) {
92 int ret2 = av_dup_packet(pkt);
93 if (ret >= 0 && ret2 < 0)
94 ret = ret2;
95 } else {
96 pkt->data = NULL;
97 pkt->size = 0;
98 }
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);
104 }
105end:
106 av_free(pkt);
107 pthread_mutex_lock(&c->buffer_mutex);
108 avcodec_close(avctx);
109 pthread_mutex_unlock(&c->buffer_mutex);
110 av_freep(&avctx);
111 return NULL;
112}
113
114int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){
115 int i=0;
116 ThreadContext *c;
117
118
119 if( !(avctx->thread_type & FF_THREAD_FRAME)
120 || !(avctx->codec->capabilities & AV_CODEC_CAP_INTRA_ONLY))
121 return 0;
122
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;
130 }
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");
137
138 if (avctx->codec_id == AV_CODEC_ID_HUFFYUV ||
139 avctx->codec_id == AV_CODEC_ID_FFVHUFF) {
140 int warn = 0;
141 int context_model = 0;
142 AVDictionaryEntry *con = av_dict_get(options, "context", NULL, AV_DICT_MATCH_CASE);
143
144 if (con && con->value)
145 context_model = atoi(con->value);
146
147 if (avctx->flags & AV_CODEC_FLAG_PASS1)
148 warn = 1;
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;
153 }
154 // huffyuv does not support these with multiple frame threads currently
155 if (warn) {
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;
159 }
160 }
161
162 if(!avctx->thread_count) {
163 avctx->thread_count = av_cpu_count();
164 avctx->thread_count = FFMIN(avctx->thread_count, MAX_THREADS);
165 }
166
167 if(avctx->thread_count <= 1)
168 return 0;
169
170 if(avctx->thread_count > MAX_THREADS)
171 return AVERROR(EINVAL);
172
173 av_assert0(!avctx->internal->frame_thread_encoder);
174 c = avctx->internal->frame_thread_encoder = av_mallocz(sizeof(ThreadContext));
175 if(!c)
176 return AVERROR(ENOMEM);
177
178 c->parent_avctx = avctx;
179
180 c->task_fifo = av_fifo_alloc_array(BUFFER_SIZE, sizeof(Task));
181 if(!c->task_fifo)
182 goto fail;
183
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);
189
190 for(i=0; i<avctx->thread_count ; i++){
191 AVDictionary *tmp = NULL;
192 void *tmpv;
193 AVCodecContext *thread_avctx = avcodec_alloc_context3(avctx->codec);
194 if(!thread_avctx)
195 goto fail;
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;
203
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) {
207 av_dict_free(&tmp);
208 goto fail;
209 }
210 av_dict_free(&tmp);
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)) {
214 goto fail;
215 }
216 }
217
218 avctx->active_thread_type = FF_THREAD_FRAME;
219
220 return 0;
221fail:
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);
225 return -1;
226}
227
228void ff_frame_thread_encoder_free(AVCodecContext *avctx){
229 int i;
230 ThreadContext *c= avctx->internal->frame_thread_encoder;
231
232 pthread_mutex_lock(&c->task_fifo_mutex);
233 c->exit = 1;
234 pthread_cond_broadcast(&c->task_fifo_cond);
235 pthread_mutex_unlock(&c->task_fifo_mutex);
236
237 for (i=0; i<avctx->thread_count; i++) {
238 pthread_join(c->worker[i], NULL);
239 }
240
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);
248}
249
250int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet_ptr){
251 ThreadContext *c = avctx->internal->frame_thread_encoder;
252 Task task;
253 int ret;
254
255 av_assert1(!*got_packet_ptr);
256
257 if(frame){
258 AVFrame *new = av_frame_alloc();
259 if(!new)
260 return AVERROR(ENOMEM);
261 ret = av_frame_ref(new, frame);
262 if(ret < 0) {
263 av_frame_free(&new);
264 return ret;
265 }
266
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);
273
274 c->task_index = (c->task_index+1) % BUFFER_SIZE;
275
276 if(!c->finished_tasks[c->finished_task_index].outdata && (c->task_index - c->finished_task_index) % BUFFER_SIZE <= avctx->thread_count)
277 return 0;
278 }
279
280 if(c->task_index == c->finished_task_index)
281 return 0;
282
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);
286 }
287 task = c->finished_tasks[c->finished_task_index];
288 *pkt = *(AVPacket*)(task.outdata);
289 if(pkt->data)
290 *got_packet_ptr = 1;
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);
294
295 return task.return_code;
296}
297
generated by cgit at 2024-05-17 03:42:49 (GMT)