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frame_thread_encoder.c
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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 "avcodec.h"
27 #include "internal.h"
28 #include "thread.h"
29 
30 #if HAVE_PTHREADS
31 #include <pthread.h>
32 #elif HAVE_W32THREADS
33 #include "compat/w32pthreads.h"
34 #elif HAVE_OS2THREADS
35 #include "compat/os2threads.h"
36 #endif
37 
38 #define MAX_THREADS 64
39 #define BUFFER_SIZE (2*MAX_THREADS)
40 
41 typedef struct{
42  void *indata;
43  void *outdata;
44  int64_t return_code;
45  unsigned index;
46 } Task;
47 
48 typedef struct{
51 
55 
56  Task finished_tasks[BUFFER_SIZE];
59 
60  unsigned task_index;
62 
64  int exit;
66 
67 static void * attribute_align_arg worker(void *v){
68  AVCodecContext *avctx = v;
70  AVPacket *pkt = NULL;
71 
72  while(!c->exit){
73  int got_packet, ret;
74  AVFrame *frame;
75  Task task;
76 
77  if(!pkt) pkt= av_mallocz(sizeof(*pkt));
78  if(!pkt) continue;
79  av_init_packet(pkt);
80 
82  while (av_fifo_size(c->task_fifo) <= 0 || c->exit) {
83  if(c->exit){
85  goto end;
86  }
88  }
89  av_fifo_generic_read(c->task_fifo, &task, sizeof(task), NULL);
91  frame = task.indata;
92 
93  ret = avcodec_encode_video2(avctx, pkt, frame, &got_packet);
95  av_frame_unref(frame);
97  av_frame_free(&frame);
98  if(got_packet) {
99  av_dup_packet(pkt);
100  } else {
101  pkt->data = NULL;
102  pkt->size = 0;
103  }
105  c->finished_tasks[task.index].outdata = pkt; pkt = NULL;
106  c->finished_tasks[task.index].return_code = ret;
109  }
110 end:
111  av_free(pkt);
113  avcodec_close(avctx);
115  av_freep(&avctx);
116  return NULL;
117 }
118 
120  int i=0;
121  ThreadContext *c;
122 
123 
124  if( !(avctx->thread_type & FF_THREAD_FRAME)
125  || !(avctx->codec->capabilities & CODEC_CAP_INTRA_ONLY))
126  return 0;
127 
128  if( !avctx->thread_count
129  && avctx->codec_id == AV_CODEC_ID_MJPEG
130  && !(avctx->flags & 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;
135  }
136  if( avctx->thread_count > 1
137  && avctx->codec_id == AV_CODEC_ID_MJPEG
138  && !(avctx->flags & 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");
142 
143  if (avctx->codec_id == AV_CODEC_ID_HUFFYUV ||
144  avctx->codec_id == AV_CODEC_ID_FFVHUFF) {
145  int warn = 0;
146  if (avctx->flags & CODEC_FLAG_PASS1)
147  warn = 1;
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;
152  }
153  // huffyuv does not support these with multiple frame threads currently
154  if (warn) {
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;
158  }
159  }
160 
161  if(!avctx->thread_count) {
162  avctx->thread_count = av_cpu_count();
163  avctx->thread_count = FFMIN(avctx->thread_count, MAX_THREADS);
164  }
165 
166  if(avctx->thread_count <= 1)
167  return 0;
168 
169  if(avctx->thread_count > MAX_THREADS)
170  return AVERROR(EINVAL);
171 
173  c = avctx->internal->frame_thread_encoder = av_mallocz(sizeof(ThreadContext));
174  if(!c)
175  return AVERROR(ENOMEM);
176 
177  c->parent_avctx = avctx;
178 
180  if(!c->task_fifo)
181  goto fail;
182 
185  pthread_mutex_init(&c->buffer_mutex, NULL);
188 
189  for(i=0; i<avctx->thread_count ; i++){
190  AVDictionary *tmp = NULL;
191  void *tmpv;
192  AVCodecContext *thread_avctx = avcodec_alloc_context3(avctx->codec);
193  if(!thread_avctx)
194  goto fail;
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;
202 
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) {
206  av_dict_free(&tmp);
207  goto fail;
208  }
209  av_dict_free(&tmp);
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)) {
213  goto fail;
214  }
215  }
216 
218 
219  return 0;
220 fail:
221  avctx->thread_count = i;
222  av_log(avctx, AV_LOG_ERROR, "ff_frame_thread_encoder_init failed\n");
224  return -1;
225 }
226 
228  int i;
230 
232  c->exit = 1;
235 
236  for (i=0; i<avctx->thread_count; i++) {
237  pthread_join(c->worker[i], NULL);
238  }
239 
247 }
248 
249 int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet_ptr){
251  Task task;
252  int ret;
253 
254  av_assert1(!*got_packet_ptr);
255 
256  if(frame){
257  AVFrame *new = av_frame_alloc();
258  if(!new)
259  return AVERROR(ENOMEM);
260  ret = av_frame_ref(new, frame);
261  if(ret < 0) {
262  av_frame_free(&new);
263  return ret;
264  }
265 
266  task.index = c->task_index;
267  task.indata = (void*)new;
269  av_fifo_generic_write(c->task_fifo, &task, sizeof(task), NULL);
272 
273  c->task_index = (c->task_index+1) % BUFFER_SIZE;
274 
276  return 0;
277  }
278 
279  if(c->task_index == c->finished_task_index)
280  return 0;
281 
283  while (!c->finished_tasks[c->finished_task_index].outdata) {
285  }
286  task = c->finished_tasks[c->finished_task_index];
287  *pkt = *(AVPacket*)(task.outdata);
288  if(pkt->data)
289  *got_packet_ptr = 1;
293 
294  return task.return_code;
295 }