FFmpeg: libavcodec/frame_thread_encoder.c Source File

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libavcodec

frame_thread_encoder.c

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1 /*

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 */

21 #include "frame_thread_encoder.h"

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"

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

38 #define MAX_THREADS 64

39 #define BUFFER_SIZE (2*MAX_THREADS)

41 typedef struct{

42 void *indata;

43 void *outdata;

44 int64_t return_code;

45 unsigned index;

46 } Task;

48 typedef struct{

49 AVCodecContext *parent_avctx;

50 pthread_mutex_t buffer_mutex;

52 AVFifoBuffer *task_fifo;

53 pthread_mutex_t task_fifo_mutex;

54 pthread_cond_t task_fifo_cond;

56 Task finished_tasks[BUFFER_SIZE];

57 pthread_mutex_t finished_task_mutex;

58 pthread_cond_t finished_task_cond;

60 unsigned task_index;

61 unsigned finished_task_index;

63 pthread_t worker[MAX_THREADS];

64 int exit;

65 } ThreadContext;

67 static void * attribute_align_arg worker(void *v){

68 AVCodecContext *avctx = v;

69 ThreadContext *c = avctx->internal->frame_thread_encoder;

70 AVPacket *pkt = NULL;

72 while(!c->exit){

73 int got_packet, ret;

74 AVFrame *frame;

75 Task task;

77 if(!pkt) pkt= av_mallocz(sizeof(*pkt));

78 if(!pkt) continue;

79 av_init_packet(pkt);

81 pthread_mutex_lock(&c->task_fifo_mutex);

82 while (av_fifo_size(c->task_fifo) <= 0 || c->exit) {

83 if(c->exit){

84 pthread_mutex_unlock(&c->task_fifo_mutex);

85 goto end;

86 }

87 pthread_cond_wait(&c->task_fifo_cond, &c->task_fifo_mutex);

88 }

89 av_fifo_generic_read(c->task_fifo, &task, sizeof(task), NULL);

90 pthread_mutex_unlock(&c->task_fifo_mutex);

91 frame = task.indata;

93 ret = avcodec_encode_video2(avctx, pkt, frame, &got_packet);

94 pthread_mutex_lock(&c->buffer_mutex);

95 av_frame_unref(frame);

96 pthread_mutex_unlock(&c->buffer_mutex);

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 }

104 pthread_mutex_lock(&c->finished_task_mutex);

105 c->finished_tasks[task.index].outdata = pkt; pkt = NULL;

106 c->finished_tasks[task.index].return_code = ret;

107 pthread_cond_signal(&c->finished_task_cond);

108 pthread_mutex_unlock(&c->finished_task_mutex);

109 }

110 end:

111 av_free(pkt);

112 pthread_mutex_lock(&c->buffer_mutex);

113 avcodec_close(avctx);

114 pthread_mutex_unlock(&c->buffer_mutex);

115 av_freep(&avctx);

116 return NULL;

117 }

118

119 int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){

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

172 av_assert0(!avctx->internal->frame_thread_encoder);

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

179 c->task_fifo = av_fifo_alloc_array(BUFFER_SIZE, sizeof(Task));

180 if(!c->task_fifo)

181 goto fail;

182

183 pthread_mutex_init(&c->task_fifo_mutex, NULL);

184 pthread_mutex_init(&c->finished_task_mutex, NULL);

185 pthread_mutex_init(&c->buffer_mutex, NULL);

186 pthread_cond_init(&c->task_fifo_cond, NULL);

187 pthread_cond_init(&c->finished_task_cond, 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

217 avctx->active_thread_type = FF_THREAD_FRAME;

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");

223 ff_frame_thread_encoder_free(avctx);

224 return -1;

225 }

226

227 void ff_frame_thread_encoder_free(AVCodecContext *avctx){

228 int i;

229 ThreadContext *c= avctx->internal->frame_thread_encoder;

230

231 pthread_mutex_lock(&c->task_fifo_mutex);

232 c->exit = 1;

233 pthread_cond_broadcast(&c->task_fifo_cond);

234 pthread_mutex_unlock(&c->task_fifo_mutex);

235

236 for (i=0; i<avctx->thread_count; i++) {

237 pthread_join(c->worker[i], NULL);

238 }

239

240 pthread_mutex_destroy(&c->task_fifo_mutex);

241 pthread_mutex_destroy(&c->finished_task_mutex);

242 pthread_mutex_destroy(&c->buffer_mutex);

243 pthread_cond_destroy(&c->task_fifo_cond);

244 pthread_cond_destroy(&c->finished_task_cond);

245 av_fifo_freep(&c->task_fifo);

246 av_freep(&avctx->internal->frame_thread_encoder);

247 }

248

249 int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet_ptr){

250 ThreadContext *c = avctx->internal->frame_thread_encoder;

251 Task task;

252 int ret;

253

254 av_assert1(!*got_packet_ptr);

255

256 if(frame){

257 if(!(avctx->flags & CODEC_FLAG_INPUT_PRESERVED)){

258 AVFrame *new = av_frame_alloc();

259 if(!new)

260 return AVERROR(ENOMEM);

261 pthread_mutex_lock(&c->buffer_mutex);

262 ret = ff_get_buffer(c->parent_avctx, new, 0);

263 pthread_mutex_unlock(&c->buffer_mutex);

264 if(ret<0)

265 return ret;

266 new->pts = frame->pts;

267 new->quality = frame->quality;

268 new->pict_type = frame->pict_type;

269 av_image_copy(new->data, new->linesize, (const uint8_t **)frame->data, frame->linesize,

270 avctx->pix_fmt, avctx->width, avctx->height);

271 frame = new;

272 }

273

274 task.index = c->task_index;

275 task.indata = (void*)frame;

276 pthread_mutex_lock(&c->task_fifo_mutex);

277 av_fifo_generic_write(c->task_fifo, &task, sizeof(task), NULL);

278 pthread_cond_signal(&c->task_fifo_cond);

279 pthread_mutex_unlock(&c->task_fifo_mutex);

280

281 c->task_index = (c->task_index+1) % BUFFER_SIZE;

282

283 if(!c->finished_tasks[c->finished_task_index].outdata && (c->task_index - c->finished_task_index) % BUFFER_SIZE <= avctx->thread_count)

284 return 0;

285 }

286

287 if(c->task_index == c->finished_task_index)

288 return 0;

289

290 pthread_mutex_lock(&c->finished_task_mutex);

291 while (!c->finished_tasks[c->finished_task_index].outdata) {

292 pthread_cond_wait(&c->finished_task_cond, &c->finished_task_mutex);

293 }

294 task = c->finished_tasks[c->finished_task_index];

295 *pkt = *(AVPacket*)(task.outdata);

296 if(pkt->data)

297 *got_packet_ptr = 1;

298 av_freep(&c->finished_tasks[c->finished_task_index].outdata);

299 c->finished_task_index = (c->finished_task_index+1) % BUFFER_SIZE;

300 pthread_mutex_unlock(&c->finished_task_mutex);

301

302 return task.return_code;

303 }

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