• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

libavcodec/pthread.c

Go to the documentation of this file.
00001 /*
00002  * Copyright (c) 2004 Roman Shaposhnik
00003  * Copyright (c) 2008 Alexander Strange (astrange@ithinksw.com)
00004  *
00005  * Many thanks to Steven M. Schultz for providing clever ideas and
00006  * to Michael Niedermayer <michaelni@gmx.at> for writing initial
00007  * implementation.
00008  *
00009  * This file is part of FFmpeg.
00010  *
00011  * FFmpeg is free software; you can redistribute it and/or
00012  * modify it under the terms of the GNU Lesser General Public
00013  * License as published by the Free Software Foundation; either
00014  * version 2.1 of the License, or (at your option) any later version.
00015  *
00016  * FFmpeg is distributed in the hope that it will be useful,
00017  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00018  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00019  * Lesser General Public License for more details.
00020  *
00021  * You should have received a copy of the GNU Lesser General Public
00022  * License along with FFmpeg; if not, write to the Free Software
00023  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00024  */
00025 
00032 #include "config.h"
00033 
00034 #if HAVE_SCHED_GETAFFINITY
00035 #define _GNU_SOURCE
00036 #include <sched.h>
00037 #endif
00038 #if HAVE_GETPROCESSAFFINITYMASK
00039 #include <windows.h>
00040 #endif
00041 #if HAVE_SYSCTL
00042 #if HAVE_SYS_PARAM_H
00043 #include <sys/param.h>
00044 #endif
00045 #include <sys/types.h>
00046 #include <sys/param.h>
00047 #include <sys/sysctl.h>
00048 #endif
00049 #if HAVE_SYSCONF
00050 #include <unistd.h>
00051 #endif
00052 
00053 #include "avcodec.h"
00054 #include "internal.h"
00055 #include "thread.h"
00056 
00057 #if HAVE_PTHREADS
00058 #include <pthread.h>
00059 #elif HAVE_W32THREADS
00060 #include "w32pthreads.h"
00061 #elif HAVE_OS2THREADS
00062 #include "os2threads.h"
00063 #endif
00064 
00065 typedef int (action_func)(AVCodecContext *c, void *arg);
00066 typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
00067 
00068 typedef struct ThreadContext {
00069     pthread_t *workers;
00070     action_func *func;
00071     action_func2 *func2;
00072     void *args;
00073     int *rets;
00074     int rets_count;
00075     int job_count;
00076     int job_size;
00077 
00078     pthread_cond_t last_job_cond;
00079     pthread_cond_t current_job_cond;
00080     pthread_mutex_t current_job_lock;
00081     int current_job;
00082     unsigned int current_execute;
00083     int done;
00084 } ThreadContext;
00085 
00087 #define MAX_BUFFERS (32+1)
00088 
00092 typedef struct PerThreadContext {
00093     struct FrameThreadContext *parent;
00094 
00095     pthread_t      thread;
00096     int            thread_init;
00097     pthread_cond_t input_cond;      
00098     pthread_cond_t progress_cond;   
00099     pthread_cond_t output_cond;     
00100 
00101     pthread_mutex_t mutex;          
00102     pthread_mutex_t progress_mutex; 
00103 
00104     AVCodecContext *avctx;          
00105 
00106     AVPacket       avpkt;           
00107     int            allocated_buf_size; 
00108 
00109     AVFrame frame;                  
00110     int     got_frame;              
00111     int     result;                 
00112 
00113     enum {
00114         STATE_INPUT_READY,          
00115         STATE_SETTING_UP,           
00116         STATE_GET_BUFFER,           
00120         STATE_SETUP_FINISHED        
00121     } state;
00122 
00127     AVFrame released_buffers[MAX_BUFFERS];
00128     int     num_released_buffers;
00129 
00133     int     progress[MAX_BUFFERS][2];
00134     uint8_t progress_used[MAX_BUFFERS];
00135 
00136     AVFrame *requested_frame;       
00137 } PerThreadContext;
00138 
00142 typedef struct FrameThreadContext {
00143     PerThreadContext *threads;     
00144     PerThreadContext *prev_thread; 
00145 
00146     pthread_mutex_t buffer_mutex;  
00147 
00148     int next_decoding;             
00149     int next_finished;             
00150 
00151     int delaying;                  
00156     int die;                       
00157 } FrameThreadContext;
00158 
00159 
00160 /* H264 slice threading seems to be buggy with more than 16 threads,
00161  * limit the number of threads to 16 for automatic detection */
00162 #define MAX_AUTO_THREADS 16
00163 
00164 static int get_logical_cpus(AVCodecContext *avctx)
00165 {
00166     int ret, nb_cpus = 1;
00167 #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
00168     cpu_set_t cpuset;
00169 
00170     CPU_ZERO(&cpuset);
00171 
00172     ret = sched_getaffinity(0, sizeof(cpuset), &cpuset);
00173     if (!ret) {
00174         nb_cpus = CPU_COUNT(&cpuset);
00175     }
00176 #elif HAVE_GETPROCESSAFFINITYMASK
00177     DWORD_PTR proc_aff, sys_aff;
00178     ret = GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff);
00179     if (ret)
00180         nb_cpus = av_popcount64(proc_aff);
00181 #elif HAVE_SYSCTL && defined(HW_NCPU)
00182     int mib[2] = { CTL_HW, HW_NCPU };
00183     size_t len = sizeof(nb_cpus);
00184 
00185     ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0);
00186     if (ret == -1)
00187         nb_cpus = 0;
00188 #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
00189     nb_cpus = sysconf(_SC_NPROC_ONLN);
00190 #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
00191     nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
00192 #endif
00193     av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
00194 
00195     if  (avctx->height)
00196         nb_cpus = FFMIN(nb_cpus, (avctx->height+15)/16);
00197 
00198     return nb_cpus;
00199 }
00200 
00201 
00202 static void* attribute_align_arg worker(void *v)
00203 {
00204     AVCodecContext *avctx = v;
00205     ThreadContext *c = avctx->thread_opaque;
00206     int our_job = c->job_count;
00207     int last_execute = 0;
00208     int thread_count = avctx->thread_count;
00209     int self_id;
00210 
00211     pthread_mutex_lock(&c->current_job_lock);
00212     self_id = c->current_job++;
00213     for (;;){
00214         while (our_job >= c->job_count) {
00215             if (c->current_job == thread_count + c->job_count)
00216                 pthread_cond_signal(&c->last_job_cond);
00217 
00218             while (last_execute == c->current_execute && !c->done)
00219                 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
00220             last_execute = c->current_execute;
00221             our_job = self_id;
00222 
00223             if (c->done) {
00224                 pthread_mutex_unlock(&c->current_job_lock);
00225                 return NULL;
00226             }
00227         }
00228         pthread_mutex_unlock(&c->current_job_lock);
00229 
00230         c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
00231                                                    c->func2(avctx, c->args, our_job, self_id);
00232 
00233         pthread_mutex_lock(&c->current_job_lock);
00234         our_job = c->current_job++;
00235     }
00236 }
00237 
00238 static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
00239 {
00240     while (c->current_job != thread_count + c->job_count)
00241         pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
00242     pthread_mutex_unlock(&c->current_job_lock);
00243 }
00244 
00245 static void thread_free(AVCodecContext *avctx)
00246 {
00247     ThreadContext *c = avctx->thread_opaque;
00248     int i;
00249 
00250     pthread_mutex_lock(&c->current_job_lock);
00251     c->done = 1;
00252     pthread_cond_broadcast(&c->current_job_cond);
00253     pthread_mutex_unlock(&c->current_job_lock);
00254 
00255     for (i=0; i<avctx->thread_count; i++)
00256          pthread_join(c->workers[i], NULL);
00257 
00258     pthread_mutex_destroy(&c->current_job_lock);
00259     pthread_cond_destroy(&c->current_job_cond);
00260     pthread_cond_destroy(&c->last_job_cond);
00261     av_free(c->workers);
00262     av_freep(&avctx->thread_opaque);
00263 }
00264 
00265 static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
00266 {
00267     ThreadContext *c= avctx->thread_opaque;
00268     int dummy_ret;
00269 
00270     if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
00271         return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
00272 
00273     if (job_count <= 0)
00274         return 0;
00275 
00276     pthread_mutex_lock(&c->current_job_lock);
00277 
00278     c->current_job = avctx->thread_count;
00279     c->job_count = job_count;
00280     c->job_size = job_size;
00281     c->args = arg;
00282     c->func = func;
00283     if (ret) {
00284         c->rets = ret;
00285         c->rets_count = job_count;
00286     } else {
00287         c->rets = &dummy_ret;
00288         c->rets_count = 1;
00289     }
00290     c->current_execute++;
00291     pthread_cond_broadcast(&c->current_job_cond);
00292 
00293     avcodec_thread_park_workers(c, avctx->thread_count);
00294 
00295     return 0;
00296 }
00297 
00298 static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
00299 {
00300     ThreadContext *c= avctx->thread_opaque;
00301     c->func2 = func2;
00302     return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
00303 }
00304 
00305 static int thread_init(AVCodecContext *avctx)
00306 {
00307     int i;
00308     ThreadContext *c;
00309     int thread_count = avctx->thread_count;
00310 
00311     if (!thread_count) {
00312         int nb_cpus = get_logical_cpus(avctx);
00313         // use number of cores + 1 as thread count if there is more than one
00314         if (nb_cpus > 1)
00315             thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
00316         else
00317             thread_count = avctx->thread_count = 1;
00318     }
00319 
00320     if (thread_count <= 1) {
00321         avctx->active_thread_type = 0;
00322         return 0;
00323     }
00324 
00325     c = av_mallocz(sizeof(ThreadContext));
00326     if (!c)
00327         return -1;
00328 
00329     c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
00330     if (!c->workers) {
00331         av_free(c);
00332         return -1;
00333     }
00334 
00335     avctx->thread_opaque = c;
00336     c->current_job = 0;
00337     c->job_count = 0;
00338     c->job_size = 0;
00339     c->done = 0;
00340     pthread_cond_init(&c->current_job_cond, NULL);
00341     pthread_cond_init(&c->last_job_cond, NULL);
00342     pthread_mutex_init(&c->current_job_lock, NULL);
00343     pthread_mutex_lock(&c->current_job_lock);
00344     for (i=0; i<thread_count; i++) {
00345         if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
00346            avctx->thread_count = i;
00347            pthread_mutex_unlock(&c->current_job_lock);
00348            ff_thread_free(avctx);
00349            return -1;
00350         }
00351     }
00352 
00353     avcodec_thread_park_workers(c, thread_count);
00354 
00355     avctx->execute = avcodec_thread_execute;
00356     avctx->execute2 = avcodec_thread_execute2;
00357     return 0;
00358 }
00359 
00367 static attribute_align_arg void *frame_worker_thread(void *arg)
00368 {
00369     PerThreadContext *p = arg;
00370     FrameThreadContext *fctx = p->parent;
00371     AVCodecContext *avctx = p->avctx;
00372     AVCodec *codec = avctx->codec;
00373 
00374     while (1) {
00375         int i;
00376         if (p->state == STATE_INPUT_READY && !fctx->die) {
00377             pthread_mutex_lock(&p->mutex);
00378             while (p->state == STATE_INPUT_READY && !fctx->die)
00379                 pthread_cond_wait(&p->input_cond, &p->mutex);
00380             pthread_mutex_unlock(&p->mutex);
00381         }
00382 
00383         if (fctx->die) break;
00384 
00385         if (!codec->update_thread_context && (avctx->thread_safe_callbacks || avctx->get_buffer == avcodec_default_get_buffer))
00386             ff_thread_finish_setup(avctx);
00387 
00388         pthread_mutex_lock(&p->mutex);
00389         avcodec_get_frame_defaults(&p->frame);
00390         p->got_frame = 0;
00391         p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
00392 
00393         if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
00394 
00395         p->state = STATE_INPUT_READY;
00396 
00397         pthread_mutex_lock(&p->progress_mutex);
00398         for (i = 0; i < MAX_BUFFERS; i++)
00399             if (p->progress_used[i] && (p->got_frame || p->result<0 || avctx->codec_id != CODEC_ID_H264)) {
00400                 p->progress[i][0] = INT_MAX;
00401                 p->progress[i][1] = INT_MAX;
00402             }
00403         pthread_cond_broadcast(&p->progress_cond);
00404         pthread_cond_signal(&p->output_cond);
00405         pthread_mutex_unlock(&p->progress_mutex);
00406 
00407         pthread_mutex_unlock(&p->mutex);
00408     }
00409 
00410     return NULL;
00411 }
00412 
00420 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
00421 {
00422     int err = 0;
00423 
00424     if (dst != src) {
00425         dst->sub_id    = src->sub_id;
00426         dst->time_base = src->time_base;
00427         dst->width     = src->width;
00428         dst->height    = src->height;
00429         dst->pix_fmt   = src->pix_fmt;
00430 
00431         dst->coded_width  = src->coded_width;
00432         dst->coded_height = src->coded_height;
00433 
00434         dst->has_b_frames = src->has_b_frames;
00435         dst->idct_algo    = src->idct_algo;
00436 
00437         dst->bits_per_coded_sample = src->bits_per_coded_sample;
00438         dst->sample_aspect_ratio   = src->sample_aspect_ratio;
00439         dst->dtg_active_format     = src->dtg_active_format;
00440 
00441         dst->profile = src->profile;
00442         dst->level   = src->level;
00443 
00444         dst->bits_per_raw_sample = src->bits_per_raw_sample;
00445         dst->ticks_per_frame     = src->ticks_per_frame;
00446         dst->color_primaries     = src->color_primaries;
00447 
00448         dst->color_trc   = src->color_trc;
00449         dst->colorspace  = src->colorspace;
00450         dst->color_range = src->color_range;
00451         dst->chroma_sample_location = src->chroma_sample_location;
00452     }
00453 
00454     if (for_user) {
00455         dst->delay       = src->thread_count - 1;
00456         dst->coded_frame = src->coded_frame;
00457     } else {
00458         if (dst->codec->update_thread_context)
00459             err = dst->codec->update_thread_context(dst, src);
00460     }
00461 
00462     return err;
00463 }
00464 
00472 static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
00473 {
00474 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
00475     dst->flags          = src->flags;
00476 
00477     dst->draw_horiz_band= src->draw_horiz_band;
00478     dst->get_buffer     = src->get_buffer;
00479     dst->release_buffer = src->release_buffer;
00480 
00481     dst->opaque   = src->opaque;
00482     dst->dsp_mask = src->dsp_mask;
00483     dst->debug    = src->debug;
00484     dst->debug_mv = src->debug_mv;
00485 
00486     dst->slice_flags = src->slice_flags;
00487     dst->flags2      = src->flags2;
00488 
00489     copy_fields(skip_loop_filter, bidir_refine);
00490 
00491     dst->frame_number     = src->frame_number;
00492     dst->reordered_opaque = src->reordered_opaque;
00493     dst->thread_safe_callbacks = src->thread_safe_callbacks;
00494 
00495     if (src->slice_count && src->slice_offset) {
00496         if (dst->slice_count < src->slice_count) {
00497             int *tmp = av_realloc(dst->slice_offset, src->slice_count *
00498                                   sizeof(*dst->slice_offset));
00499             if (!tmp) {
00500                 av_free(dst->slice_offset);
00501                 return AVERROR(ENOMEM);
00502             }
00503             dst->slice_offset = tmp;
00504         }
00505         memcpy(dst->slice_offset, src->slice_offset,
00506                src->slice_count * sizeof(*dst->slice_offset));
00507     }
00508     dst->slice_count = src->slice_count;
00509     return 0;
00510 #undef copy_fields
00511 }
00512 
00513 static void free_progress(AVFrame *f)
00514 {
00515     PerThreadContext *p = f->owner->thread_opaque;
00516     int *progress = f->thread_opaque;
00517 
00518     p->progress_used[(progress - p->progress[0]) / 2] = 0;
00519 }
00520 
00522 static void release_delayed_buffers(PerThreadContext *p)
00523 {
00524     FrameThreadContext *fctx = p->parent;
00525 
00526     while (p->num_released_buffers > 0) {
00527         AVFrame *f;
00528 
00529         pthread_mutex_lock(&fctx->buffer_mutex);
00530         f = &p->released_buffers[--p->num_released_buffers];
00531         free_progress(f);
00532         f->thread_opaque = NULL;
00533 
00534         f->owner->release_buffer(f->owner, f);
00535         pthread_mutex_unlock(&fctx->buffer_mutex);
00536     }
00537 }
00538 
00539 static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
00540 {
00541     FrameThreadContext *fctx = p->parent;
00542     PerThreadContext *prev_thread = fctx->prev_thread;
00543     AVCodec *codec = p->avctx->codec;
00544     uint8_t *buf = p->avpkt.data;
00545 
00546     if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
00547 
00548     pthread_mutex_lock(&p->mutex);
00549 
00550     release_delayed_buffers(p);
00551 
00552     if (prev_thread) {
00553         int err;
00554         if (prev_thread->state == STATE_SETTING_UP) {
00555             pthread_mutex_lock(&prev_thread->progress_mutex);
00556             while (prev_thread->state == STATE_SETTING_UP)
00557                 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
00558             pthread_mutex_unlock(&prev_thread->progress_mutex);
00559         }
00560 
00561         err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
00562         if (err) {
00563             pthread_mutex_unlock(&p->mutex);
00564             return err;
00565         }
00566     }
00567 
00568     av_fast_malloc(&buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
00569     p->avpkt = *avpkt;
00570     p->avpkt.data = buf;
00571     memcpy(buf, avpkt->data, avpkt->size);
00572     memset(buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
00573 
00574     p->state = STATE_SETTING_UP;
00575     pthread_cond_signal(&p->input_cond);
00576     pthread_mutex_unlock(&p->mutex);
00577 
00578     /*
00579      * If the client doesn't have a thread-safe get_buffer(),
00580      * then decoding threads call back to the main thread,
00581      * and it calls back to the client here.
00582      */
00583 
00584     if (!p->avctx->thread_safe_callbacks &&
00585          p->avctx->get_buffer != avcodec_default_get_buffer) {
00586         while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
00587             pthread_mutex_lock(&p->progress_mutex);
00588             while (p->state == STATE_SETTING_UP)
00589                 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
00590 
00591             if (p->state == STATE_GET_BUFFER) {
00592                 p->result = p->avctx->get_buffer(p->avctx, p->requested_frame);
00593                 p->state  = STATE_SETTING_UP;
00594                 pthread_cond_signal(&p->progress_cond);
00595             }
00596             pthread_mutex_unlock(&p->progress_mutex);
00597         }
00598     }
00599 
00600     fctx->prev_thread = p;
00601     fctx->next_decoding++;
00602 
00603     return 0;
00604 }
00605 
00606 int ff_thread_decode_frame(AVCodecContext *avctx,
00607                            AVFrame *picture, int *got_picture_ptr,
00608                            AVPacket *avpkt)
00609 {
00610     FrameThreadContext *fctx = avctx->thread_opaque;
00611     int finished = fctx->next_finished;
00612     PerThreadContext *p;
00613     int err;
00614 
00615     /*
00616      * Submit a packet to the next decoding thread.
00617      */
00618 
00619     p = &fctx->threads[fctx->next_decoding];
00620     err = update_context_from_user(p->avctx, avctx);
00621     if (err) return err;
00622     err = submit_packet(p, avpkt);
00623     if (err) return err;
00624 
00625     /*
00626      * If we're still receiving the initial packets, don't return a frame.
00627      */
00628 
00629     if (fctx->delaying && avpkt->size) {
00630         if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;
00631 
00632         *got_picture_ptr=0;
00633         return avpkt->size;
00634     }
00635 
00636     /*
00637      * Return the next available frame from the oldest thread.
00638      * If we're at the end of the stream, then we have to skip threads that
00639      * didn't output a frame, because we don't want to accidentally signal
00640      * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
00641      */
00642 
00643     do {
00644         p = &fctx->threads[finished++];
00645 
00646         if (p->state != STATE_INPUT_READY) {
00647             pthread_mutex_lock(&p->progress_mutex);
00648             while (p->state != STATE_INPUT_READY)
00649                 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
00650             pthread_mutex_unlock(&p->progress_mutex);
00651         }
00652 
00653         *picture = p->frame;
00654         *got_picture_ptr = p->got_frame;
00655         picture->pkt_dts = p->avpkt.dts;
00656         picture->sample_aspect_ratio = avctx->sample_aspect_ratio;
00657         picture->width  = avctx->width;
00658         picture->height = avctx->height;
00659         picture->format = avctx->pix_fmt;
00660 
00661         /*
00662          * A later call with avkpt->size == 0 may loop over all threads,
00663          * including this one, searching for a frame to return before being
00664          * stopped by the "finished != fctx->next_finished" condition.
00665          * Make sure we don't mistakenly return the same frame again.
00666          */
00667         p->got_frame = 0;
00668 
00669         if (finished >= avctx->thread_count) finished = 0;
00670     } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
00671 
00672     update_context_from_thread(avctx, p->avctx, 1);
00673 
00674     if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
00675 
00676     fctx->next_finished = finished;
00677 
00678     /* return the size of the consumed packet if no error occurred */
00679     return (p->result >= 0) ? avpkt->size : p->result;
00680 }
00681 
00682 void ff_thread_report_progress(AVFrame *f, int n, int field)
00683 {
00684     PerThreadContext *p;
00685     int *progress = f->thread_opaque;
00686 
00687     if (!progress || progress[field] >= n) return;
00688 
00689     p = f->owner->thread_opaque;
00690 
00691     if (f->owner->debug&FF_DEBUG_THREADS)
00692         av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
00693 
00694     pthread_mutex_lock(&p->progress_mutex);
00695     progress[field] = n;
00696     pthread_cond_broadcast(&p->progress_cond);
00697     pthread_mutex_unlock(&p->progress_mutex);
00698 }
00699 
00700 void ff_thread_await_progress(AVFrame *f, int n, int field)
00701 {
00702     PerThreadContext *p;
00703     int *progress = f->thread_opaque;
00704 
00705     if (!progress || progress[field] >= n) return;
00706 
00707     p = f->owner->thread_opaque;
00708 
00709     if (f->owner->debug&FF_DEBUG_THREADS)
00710         av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
00711 
00712     pthread_mutex_lock(&p->progress_mutex);
00713     while (progress[field] < n)
00714         pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
00715     pthread_mutex_unlock(&p->progress_mutex);
00716 }
00717 
00718 void ff_thread_finish_setup(AVCodecContext *avctx) {
00719     PerThreadContext *p = avctx->thread_opaque;
00720 
00721     if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
00722 
00723     if(p->state == STATE_SETUP_FINISHED){
00724         av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
00725     }
00726 
00727     pthread_mutex_lock(&p->progress_mutex);
00728     p->state = STATE_SETUP_FINISHED;
00729     pthread_cond_broadcast(&p->progress_cond);
00730     pthread_mutex_unlock(&p->progress_mutex);
00731 }
00732 
00734 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
00735 {
00736     int i;
00737 
00738     for (i = 0; i < thread_count; i++) {
00739         PerThreadContext *p = &fctx->threads[i];
00740 
00741         if (p->state != STATE_INPUT_READY) {
00742             pthread_mutex_lock(&p->progress_mutex);
00743             while (p->state != STATE_INPUT_READY)
00744                 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
00745             pthread_mutex_unlock(&p->progress_mutex);
00746         }
00747         p->got_frame = 0;
00748     }
00749 }
00750 
00751 static void frame_thread_free(AVCodecContext *avctx, int thread_count)
00752 {
00753     FrameThreadContext *fctx = avctx->thread_opaque;
00754     AVCodec *codec = avctx->codec;
00755     int i;
00756 
00757     park_frame_worker_threads(fctx, thread_count);
00758 
00759     if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
00760         update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
00761 
00762     fctx->die = 1;
00763 
00764     for (i = 0; i < thread_count; i++) {
00765         PerThreadContext *p = &fctx->threads[i];
00766 
00767         pthread_mutex_lock(&p->mutex);
00768         pthread_cond_signal(&p->input_cond);
00769         pthread_mutex_unlock(&p->mutex);
00770 
00771         if (p->thread_init)
00772             pthread_join(p->thread, NULL);
00773         p->thread_init=0;
00774 
00775         if (codec->close)
00776             codec->close(p->avctx);
00777 
00778         avctx->codec = NULL;
00779 
00780         release_delayed_buffers(p);
00781     }
00782 
00783     for (i = 0; i < thread_count; i++) {
00784         PerThreadContext *p = &fctx->threads[i];
00785 
00786         avcodec_default_free_buffers(p->avctx);
00787 
00788         pthread_mutex_destroy(&p->mutex);
00789         pthread_mutex_destroy(&p->progress_mutex);
00790         pthread_cond_destroy(&p->input_cond);
00791         pthread_cond_destroy(&p->progress_cond);
00792         pthread_cond_destroy(&p->output_cond);
00793         av_freep(&p->avpkt.data);
00794 
00795         if (i) {
00796             av_freep(&p->avctx->priv_data);
00797             av_freep(&p->avctx->internal);
00798             av_freep(&p->avctx->slice_offset);
00799         }
00800 
00801         av_freep(&p->avctx);
00802     }
00803 
00804     av_freep(&fctx->threads);
00805     pthread_mutex_destroy(&fctx->buffer_mutex);
00806     av_freep(&avctx->thread_opaque);
00807 }
00808 
00809 static int frame_thread_init(AVCodecContext *avctx)
00810 {
00811     int thread_count = avctx->thread_count;
00812     AVCodec *codec = avctx->codec;
00813     AVCodecContext *src = avctx;
00814     FrameThreadContext *fctx;
00815     int i, err = 0;
00816 
00817     if (!thread_count) {
00818         int nb_cpus = get_logical_cpus(avctx);
00819         if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
00820             nb_cpus = 1;
00821         // use number of cores + 1 as thread count if there is more than one
00822         if (nb_cpus > 1)
00823             thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
00824         else
00825             thread_count = avctx->thread_count = 1;
00826     }
00827 
00828     if (thread_count <= 1) {
00829         avctx->active_thread_type = 0;
00830         return 0;
00831     }
00832 
00833     avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));
00834 
00835     fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
00836     pthread_mutex_init(&fctx->buffer_mutex, NULL);
00837     fctx->delaying = 1;
00838 
00839     for (i = 0; i < thread_count; i++) {
00840         AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
00841         PerThreadContext *p  = &fctx->threads[i];
00842 
00843         pthread_mutex_init(&p->mutex, NULL);
00844         pthread_mutex_init(&p->progress_mutex, NULL);
00845         pthread_cond_init(&p->input_cond, NULL);
00846         pthread_cond_init(&p->progress_cond, NULL);
00847         pthread_cond_init(&p->output_cond, NULL);
00848 
00849         p->parent = fctx;
00850         p->avctx  = copy;
00851 
00852         if (!copy) {
00853             err = AVERROR(ENOMEM);
00854             goto error;
00855         }
00856 
00857         *copy = *src;
00858         copy->thread_opaque = p;
00859         copy->pkt = &p->avpkt;
00860 
00861         if (!i) {
00862             src = copy;
00863 
00864             if (codec->init)
00865                 err = codec->init(copy);
00866 
00867             update_context_from_thread(avctx, copy, 1);
00868         } else {
00869             copy->priv_data = av_malloc(codec->priv_data_size);
00870             if (!copy->priv_data) {
00871                 err = AVERROR(ENOMEM);
00872                 goto error;
00873             }
00874             memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
00875             copy->internal = av_malloc(sizeof(AVCodecInternal));
00876             if (!copy->internal) {
00877                 err = AVERROR(ENOMEM);
00878                 goto error;
00879             }
00880             *copy->internal = *src->internal;
00881             copy->internal->is_copy = 1;
00882 
00883             if (codec->init_thread_copy)
00884                 err = codec->init_thread_copy(copy);
00885         }
00886 
00887         if (err) goto error;
00888 
00889         p->thread_init= !pthread_create(&p->thread, NULL, frame_worker_thread, p);
00890         if(!p->thread_init)
00891             goto error;
00892     }
00893 
00894     return 0;
00895 
00896 error:
00897     frame_thread_free(avctx, i+1);
00898 
00899     return err;
00900 }
00901 
00902 void ff_thread_flush(AVCodecContext *avctx)
00903 {
00904     FrameThreadContext *fctx = avctx->thread_opaque;
00905 
00906     if (!avctx->thread_opaque) return;
00907 
00908     park_frame_worker_threads(fctx, avctx->thread_count);
00909     if (fctx->prev_thread) {
00910         if (fctx->prev_thread != &fctx->threads[0])
00911             update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
00912         if (avctx->codec->flush)
00913             avctx->codec->flush(fctx->threads[0].avctx);
00914     }
00915 
00916     fctx->next_decoding = fctx->next_finished = 0;
00917     fctx->delaying = 1;
00918     fctx->prev_thread = NULL;
00919 }
00920 
00921 static int *allocate_progress(PerThreadContext *p)
00922 {
00923     int i;
00924 
00925     for (i = 0; i < MAX_BUFFERS; i++)
00926         if (!p->progress_used[i]) break;
00927 
00928     if (i == MAX_BUFFERS) {
00929         av_log(p->avctx, AV_LOG_ERROR, "allocate_progress() overflow\n");
00930         return NULL;
00931     }
00932 
00933     p->progress_used[i] = 1;
00934 
00935     return p->progress[i];
00936 }
00937 
00938 int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
00939 {
00940     PerThreadContext *p = avctx->thread_opaque;
00941     int *progress, err;
00942 
00943     f->owner = avctx;
00944 
00945     ff_init_buffer_info(avctx, f);
00946 
00947     if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
00948         f->thread_opaque = NULL;
00949         return avctx->get_buffer(avctx, f);
00950     }
00951 
00952     if (p->state != STATE_SETTING_UP &&
00953         (avctx->codec->update_thread_context || (!avctx->thread_safe_callbacks &&
00954                 avctx->get_buffer != avcodec_default_get_buffer))) {
00955         av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
00956         return -1;
00957     }
00958 
00959     pthread_mutex_lock(&p->parent->buffer_mutex);
00960     f->thread_opaque = progress = allocate_progress(p);
00961 
00962     if (!progress) {
00963         pthread_mutex_unlock(&p->parent->buffer_mutex);
00964         return -1;
00965     }
00966 
00967     progress[0] =
00968     progress[1] = -1;
00969 
00970     if (avctx->thread_safe_callbacks ||
00971         avctx->get_buffer == avcodec_default_get_buffer) {
00972         err = avctx->get_buffer(avctx, f);
00973     } else {
00974         p->requested_frame = f;
00975         p->state = STATE_GET_BUFFER;
00976         pthread_mutex_lock(&p->progress_mutex);
00977         pthread_cond_broadcast(&p->progress_cond);
00978 
00979         while (p->state != STATE_SETTING_UP)
00980             pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
00981 
00982         err = p->result;
00983 
00984         pthread_mutex_unlock(&p->progress_mutex);
00985 
00986         if (!avctx->codec->update_thread_context)
00987             ff_thread_finish_setup(avctx);
00988     }
00989 
00990     pthread_mutex_unlock(&p->parent->buffer_mutex);
00991 
00992     return err;
00993 }
00994 
00995 void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
00996 {
00997     PerThreadContext *p = avctx->thread_opaque;
00998     FrameThreadContext *fctx;
00999 
01000     if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
01001         avctx->release_buffer(avctx, f);
01002         return;
01003     }
01004 
01005     if (p->num_released_buffers >= MAX_BUFFERS) {
01006         av_log(p->avctx, AV_LOG_ERROR, "too many thread_release_buffer calls!\n");
01007         return;
01008     }
01009 
01010     if(avctx->debug & FF_DEBUG_BUFFERS)
01011         av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
01012 
01013     fctx = p->parent;
01014     pthread_mutex_lock(&fctx->buffer_mutex);
01015     p->released_buffers[p->num_released_buffers++] = *f;
01016     pthread_mutex_unlock(&fctx->buffer_mutex);
01017     memset(f->data, 0, sizeof(f->data));
01018 }
01019 
01029 static void validate_thread_parameters(AVCodecContext *avctx)
01030 {
01031     int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
01032                                 && !(avctx->flags & CODEC_FLAG_TRUNCATED)
01033                                 && !(avctx->flags & CODEC_FLAG_LOW_DELAY)
01034                                 && !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
01035     if (avctx->thread_count == 1) {
01036         avctx->active_thread_type = 0;
01037     } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
01038         avctx->active_thread_type = FF_THREAD_FRAME;
01039     } else if (avctx->codec->capabilities & CODEC_CAP_SLICE_THREADS &&
01040                avctx->thread_type & FF_THREAD_SLICE) {
01041         avctx->active_thread_type = FF_THREAD_SLICE;
01042     } else if (!(avctx->codec->capabilities & CODEC_CAP_AUTO_THREADS)) {
01043         avctx->thread_count       = 1;
01044         avctx->active_thread_type = 0;
01045     }
01046 }
01047 
01048 int ff_thread_init(AVCodecContext *avctx)
01049 {
01050     if (avctx->thread_opaque) {
01051         av_log(avctx, AV_LOG_ERROR, "avcodec_thread_init is ignored after avcodec_open\n");
01052         return -1;
01053     }
01054 
01055 #if HAVE_W32THREADS
01056     w32thread_init();
01057 #endif
01058 
01059     if (avctx->codec) {
01060         validate_thread_parameters(avctx);
01061 
01062         if (avctx->active_thread_type&FF_THREAD_SLICE)
01063             return thread_init(avctx);
01064         else if (avctx->active_thread_type&FF_THREAD_FRAME)
01065             return frame_thread_init(avctx);
01066     }
01067 
01068     return 0;
01069 }
01070 
01071 void ff_thread_free(AVCodecContext *avctx)
01072 {
01073     if (avctx->active_thread_type&FF_THREAD_FRAME)
01074         frame_thread_free(avctx, avctx->thread_count);
01075     else
01076         thread_free(avctx);
01077 }
Generated on Fri Feb 1 2013 14:34:41 for FFmpeg by doxygen 1.7.1