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/*
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 * Copyright (c) 2004 Roman Shaposhnik
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 * Copyright (c) 2008 Alexander Strange (astrange@ithinksw.com)
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 *
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 * Many thanks to Steven M. Schultz for providing clever ideas and
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 * to Michael Niedermayer <michaelni@gmx.at> for writing initial
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 * implementation.
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * Multithreading support functions
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 * @see doc/multithreading.txt
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 */
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#include <pthread.h>
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#include "avcodec.h"
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#include "thread.h"
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typedef int (action_func)(AVCodecContext *c, void *arg);
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typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
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typedef struct ThreadContext {
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    pthread_t *workers;
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    action_func *func;
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    action_func2 *func2;
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    void *args;
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    int *rets;
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    int rets_count;
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    int job_count;
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    int job_size;
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    pthread_cond_t last_job_cond;
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    pthread_cond_t current_job_cond;
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    pthread_mutex_t current_job_lock;
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    int current_job;
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    int done;
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} ThreadContext;
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/// Max number of frame buffers that can be allocated when using frame threads.
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#define MAX_BUFFERS 32
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/**
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 * Context used by codec threads and stored in their AVCodecContext thread_opaque.
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 */
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typedef struct PerThreadContext {
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    struct FrameThreadContext *parent;
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    pthread_t      thread;
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    pthread_cond_t input_cond;      ///< Used to wait for a new packet from the main thread.
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    pthread_cond_t progress_cond;   ///< Used by child threads to wait for progress to change.
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    pthread_cond_t output_cond;     ///< Used by the main thread to wait for frames to finish.
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    pthread_mutex_t mutex;          ///< Mutex used to protect the contents of the PerThreadContext.
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    pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
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    AVCodecContext *avctx;          ///< Context used to decode packets passed to this thread.
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    AVPacket       avpkt;           ///< Input packet (for decoding) or output (for encoding).
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    int            allocated_buf_size; ///< Size allocated for avpkt.data
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    AVFrame frame;                  ///< Output frame (for decoding) or input (for encoding).
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    int     got_frame;              ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
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    int     result;                 ///< The result of the last codec decode/encode() call.
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    enum {
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        STATE_INPUT_READY,          ///< Set when the thread is awaiting a packet.
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        STATE_SETTING_UP,           ///< Set before the codec has called ff_thread_finish_setup().
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        STATE_GET_BUFFER,           /**<
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                                     * Set when the codec calls get_buffer().
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                                     * State is returned to STATE_SETTING_UP afterwards.
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                                     */
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        STATE_SETUP_FINISHED        ///< Set after the codec has called ff_thread_finish_setup().
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    } state;
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    /**
94
     * Array of frames passed to ff_thread_release_buffer().
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     * Frames are released after all threads referencing them are finished.
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     */
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    AVFrame released_buffers[MAX_BUFFERS];
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    int     num_released_buffers;
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100
    /**
101
     * Array of progress values used by ff_thread_get_buffer().
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     */
103
    int     progress[MAX_BUFFERS][2];
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    uint8_t progress_used[MAX_BUFFERS];
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    AVFrame *requested_frame;       ///< AVFrame the codec passed to get_buffer()
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} PerThreadContext;
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109
/**
110
 * Context stored in the client AVCodecContext thread_opaque.
111
 */
112
typedef struct FrameThreadContext {
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    PerThreadContext *threads;     ///< The contexts for each thread.
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    PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
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    pthread_mutex_t buffer_mutex;  ///< Mutex used to protect get/release_buffer().
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    int next_decoding;             ///< The next context to submit a packet to.
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    int next_finished;             ///< The next context to return output from.
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    int delaying;                  /**<
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                                    * Set for the first N packets, where N is the number of threads.
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                                    * While it is set, ff_thread_en/decode_frame won't return any results.
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                                    */
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    int die;                       ///< Set when threads should exit.
127
} FrameThreadContext;
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static void* attribute_align_arg worker(void *v)
130
{
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    AVCodecContext *avctx = v;
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    ThreadContext *c = avctx->thread_opaque;
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    int our_job = c->job_count;
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    int thread_count = avctx->thread_count;
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    int self_id;
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    pthread_mutex_lock(&c->current_job_lock);
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    self_id = c->current_job++;
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    for (;;){
140
        while (our_job >= c->job_count) {
141
            if (c->current_job == thread_count + c->job_count)
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                pthread_cond_signal(&c->last_job_cond);
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144
            pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
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            our_job = self_id;
146

    
147
            if (c->done) {
148
                pthread_mutex_unlock(&c->current_job_lock);
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                return NULL;
150
            }
151
        }
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        pthread_mutex_unlock(&c->current_job_lock);
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154
        c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
155
                                                   c->func2(avctx, c->args, our_job, self_id);
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        pthread_mutex_lock(&c->current_job_lock);
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        our_job = c->current_job++;
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    }
160
}
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static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
163
{
164
    pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
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    pthread_mutex_unlock(&c->current_job_lock);
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}
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168
static void thread_free(AVCodecContext *avctx)
169
{
170
    ThreadContext *c = avctx->thread_opaque;
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    int i;
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    pthread_mutex_lock(&c->current_job_lock);
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    c->done = 1;
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    pthread_cond_broadcast(&c->current_job_cond);
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    pthread_mutex_unlock(&c->current_job_lock);
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    for (i=0; i<avctx->thread_count; i++)
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         pthread_join(c->workers[i], NULL);
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    pthread_mutex_destroy(&c->current_job_lock);
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    pthread_cond_destroy(&c->current_job_cond);
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    pthread_cond_destroy(&c->last_job_cond);
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    av_free(c->workers);
185
    av_freep(&avctx->thread_opaque);
186
}
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188
static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
189
{
190
    ThreadContext *c= avctx->thread_opaque;
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    int dummy_ret;
192

    
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    if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
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        return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
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    if (job_count <= 0)
197
        return 0;
198

    
199
    pthread_mutex_lock(&c->current_job_lock);
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    c->current_job = avctx->thread_count;
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    c->job_count = job_count;
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    c->job_size = job_size;
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    c->args = arg;
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    c->func = func;
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    if (ret) {
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        c->rets = ret;
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        c->rets_count = job_count;
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    } else {
210
        c->rets = &dummy_ret;
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        c->rets_count = 1;
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    }
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    pthread_cond_broadcast(&c->current_job_cond);
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    avcodec_thread_park_workers(c, avctx->thread_count);
216

    
217
    return 0;
218
}
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static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
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{
222
    ThreadContext *c= avctx->thread_opaque;
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    c->func2 = func2;
224
    return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
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}
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static int thread_init(AVCodecContext *avctx)
228
{
229
    int i;
230
    ThreadContext *c;
231
    int thread_count = avctx->thread_count;
232

    
233
    if (thread_count <= 1)
234
        return 0;
235

    
236
    c = av_mallocz(sizeof(ThreadContext));
237
    if (!c)
238
        return -1;
239

    
240
    c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
241
    if (!c->workers) {
242
        av_free(c);
243
        return -1;
244
    }
245

    
246
    avctx->thread_opaque = c;
247
    c->current_job = 0;
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    c->job_count = 0;
249
    c->job_size = 0;
250
    c->done = 0;
251
    pthread_cond_init(&c->current_job_cond, NULL);
252
    pthread_cond_init(&c->last_job_cond, NULL);
253
    pthread_mutex_init(&c->current_job_lock, NULL);
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    pthread_mutex_lock(&c->current_job_lock);
255
    for (i=0; i<thread_count; i++) {
256
        if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
257
           avctx->thread_count = i;
258
           pthread_mutex_unlock(&c->current_job_lock);
259
           ff_thread_free(avctx);
260
           return -1;
261
        }
262
    }
263

    
264
    avcodec_thread_park_workers(c, thread_count);
265

    
266
    avctx->execute = avcodec_thread_execute;
267
    avctx->execute2 = avcodec_thread_execute2;
268
    return 0;
269
}
270

    
271
/**
272
 * Codec worker thread.
273
 *
274
 * Automatically calls ff_thread_finish_setup() if the codec does
275
 * not provide an update_thread_context method, or if the codec returns
276
 * before calling it.
277
 */
278
static attribute_align_arg void *frame_worker_thread(void *arg)
279
{
280
    PerThreadContext *p = arg;
281
    FrameThreadContext *fctx = p->parent;
282
    AVCodecContext *avctx = p->avctx;
283
    AVCodec *codec = avctx->codec;
284

    
285
    while (1) {
286
        if (p->state == STATE_INPUT_READY && !fctx->die) {
287
            pthread_mutex_lock(&p->mutex);
288
            while (p->state == STATE_INPUT_READY && !fctx->die)
289
                pthread_cond_wait(&p->input_cond, &p->mutex);
290
            pthread_mutex_unlock(&p->mutex);
291
        }
292

    
293
        if (fctx->die) break;
294

    
295
        if (!codec->update_thread_context && avctx->thread_safe_callbacks)
296
            ff_thread_finish_setup(avctx);
297

    
298
        pthread_mutex_lock(&p->mutex);
299
        avcodec_get_frame_defaults(&p->frame);
300
        p->got_frame = 0;
301
        p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
302

    
303
        if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
304

    
305
        p->state = STATE_INPUT_READY;
306

    
307
        pthread_mutex_lock(&p->progress_mutex);
308
        pthread_cond_signal(&p->output_cond);
309
        pthread_mutex_unlock(&p->progress_mutex);
310

    
311
        pthread_mutex_unlock(&p->mutex);
312
    }
313

    
314
    return NULL;
315
}
316

    
317
/**
318
 * Updates the next thread's AVCodecContext with values from the reference thread's context.
319
 *
320
 * @param dst The destination context.
321
 * @param src The source context.
322
 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
323
 */
324
static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
325
{
326
    int err = 0;
327

    
328
    if (dst != src) {
329
        dst->sub_id    = src->sub_id;
330
        dst->time_base = src->time_base;
331
        dst->width     = src->width;
332
        dst->height    = src->height;
333
        dst->pix_fmt   = src->pix_fmt;
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335
        dst->has_b_frames = src->has_b_frames;
336
        dst->idct_algo    = src->idct_algo;
337
        dst->slice_count  = src->slice_count;
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339
        dst->bits_per_coded_sample = src->bits_per_coded_sample;
340
        dst->sample_aspect_ratio   = src->sample_aspect_ratio;
341
        dst->dtg_active_format     = src->dtg_active_format;
342

    
343
        dst->profile = src->profile;
344
        dst->level   = src->level;
345

    
346
        dst->bits_per_raw_sample = src->bits_per_raw_sample;
347
        dst->ticks_per_frame     = src->ticks_per_frame;
348
        dst->color_primaries     = src->color_primaries;
349

    
350
        dst->color_trc   = src->color_trc;
351
        dst->colorspace  = src->colorspace;
352
        dst->color_range = src->color_range;
353
        dst->chroma_sample_location = src->chroma_sample_location;
354
    }
355

    
356
    if (for_user) {
357
        dst->coded_frame   = src->coded_frame;
358
        dst->has_b_frames += src->thread_count - 1;
359
    } else {
360
        if (dst->codec->update_thread_context)
361
            err = dst->codec->update_thread_context(dst, src);
362
    }
363

    
364
    return err;
365
}
366

    
367
/**
368
 * Update the next thread's AVCodecContext with values set by the user.
369
 *
370
 * @param dst The destination context.
371
 * @param src The source context.
372
 */
373
static void update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
374
{
375
#define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
376
    dst->flags          = src->flags;
377

    
378
    dst->draw_horiz_band= src->draw_horiz_band;
379
    dst->get_buffer     = src->get_buffer;
380
    dst->release_buffer = src->release_buffer;
381

    
382
    dst->opaque   = src->opaque;
383
    dst->hurry_up = src->hurry_up;
384
    dst->dsp_mask = src->dsp_mask;
385
    dst->debug    = src->debug;
386
    dst->debug_mv = src->debug_mv;
387

    
388
    dst->slice_flags = src->slice_flags;
389
    dst->flags2      = src->flags2;
390

    
391
    copy_fields(skip_loop_filter, bidir_refine);
392

    
393
    dst->frame_number     = src->frame_number;
394
    dst->reordered_opaque = src->reordered_opaque;
395
#undef copy_fields
396
}
397

    
398
static void free_progress(AVFrame *f)
399
{
400
    PerThreadContext *p = f->owner->thread_opaque;
401
    int *progress = f->thread_opaque;
402

    
403
    p->progress_used[(progress - p->progress[0]) / 2] = 0;
404
}
405

    
406
/// Releases the buffers that this decoding thread was the last user of.
407
static void release_delayed_buffers(PerThreadContext *p)
408
{
409
    FrameThreadContext *fctx = p->parent;
410

    
411
    while (p->num_released_buffers > 0) {
412
        AVFrame *f = &p->released_buffers[--p->num_released_buffers];
413

    
414
        pthread_mutex_lock(&fctx->buffer_mutex);
415
        free_progress(f);
416
        f->thread_opaque = NULL;
417

    
418
        f->owner->release_buffer(f->owner, f);
419
        pthread_mutex_unlock(&fctx->buffer_mutex);
420
    }
421
}
422

    
423
static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
424
{
425
    FrameThreadContext *fctx = p->parent;
426
    PerThreadContext *prev_thread = fctx->prev_thread;
427
    AVCodec *codec = p->avctx->codec;
428
    uint8_t *buf = p->avpkt.data;
429

    
430
    if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
431

    
432
    pthread_mutex_lock(&p->mutex);
433

    
434
    release_delayed_buffers(p);
435

    
436
    if (prev_thread) {
437
        int err;
438
        if (prev_thread->state == STATE_SETTING_UP) {
439
            pthread_mutex_lock(&prev_thread->progress_mutex);
440
            while (prev_thread->state == STATE_SETTING_UP)
441
                pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
442
            pthread_mutex_unlock(&prev_thread->progress_mutex);
443
        }
444

    
445
        err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
446
        if (err) {
447
            pthread_mutex_unlock(&p->mutex);
448
            return err;
449
        }
450
    }
451

    
452
    av_fast_malloc(&buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
453
    p->avpkt = *avpkt;
454
    p->avpkt.data = buf;
455
    memcpy(buf, avpkt->data, avpkt->size);
456
    memset(buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
457

    
458
    p->state = STATE_SETTING_UP;
459
    pthread_cond_signal(&p->input_cond);
460
    pthread_mutex_unlock(&p->mutex);
461

    
462
    /*
463
     * If the client doesn't have a thread-safe get_buffer(),
464
     * then decoding threads call back to the main thread,
465
     * and it calls back to the client here.
466
     */
467

    
468
    if (!p->avctx->thread_safe_callbacks &&
469
         p->avctx->get_buffer != avcodec_default_get_buffer) {
470
        while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
471
            pthread_mutex_lock(&p->progress_mutex);
472
            while (p->state == STATE_SETTING_UP)
473
                pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
474

    
475
            if (p->state == STATE_GET_BUFFER) {
476
                p->result = p->avctx->get_buffer(p->avctx, p->requested_frame);
477
                p->state  = STATE_SETTING_UP;
478
                pthread_cond_signal(&p->progress_cond);
479
            }
480
            pthread_mutex_unlock(&p->progress_mutex);
481
        }
482
    }
483

    
484
    fctx->prev_thread = p;
485

    
486
    return 0;
487
}
488

    
489
int ff_thread_decode_frame(AVCodecContext *avctx,
490
                           AVFrame *picture, int *got_picture_ptr,
491
                           AVPacket *avpkt)
492
{
493
    FrameThreadContext *fctx = avctx->thread_opaque;
494
    int finished = fctx->next_finished;
495
    PerThreadContext *p;
496
    int err;
497

    
498
    /*
499
     * Submit a packet to the next decoding thread.
500
     */
501

    
502
    p = &fctx->threads[fctx->next_decoding];
503
    update_context_from_user(p->avctx, avctx);
504
    err = submit_packet(p, avpkt);
505
    if (err) return err;
506

    
507
    fctx->next_decoding++;
508

    
509
    /*
510
     * If we're still receiving the initial packets, don't return a frame.
511
     */
512

    
513
    if (fctx->delaying && avpkt->size) {
514
        if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;
515

    
516
        *got_picture_ptr=0;
517
        return 0;
518
    }
519

    
520
    /*
521
     * Return the next available frame from the oldest thread.
522
     * If we're at the end of the stream, then we have to skip threads that
523
     * didn't output a frame, because we don't want to accidentally signal
524
     * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
525
     */
526

    
527
    do {
528
        p = &fctx->threads[finished++];
529

    
530
        if (p->state != STATE_INPUT_READY) {
531
            pthread_mutex_lock(&p->progress_mutex);
532
            while (p->state != STATE_INPUT_READY)
533
                pthread_cond_wait(&p->output_cond, &p->progress_mutex);
534
            pthread_mutex_unlock(&p->progress_mutex);
535
        }
536

    
537
        *picture = p->frame;
538
        *got_picture_ptr = p->got_frame;
539
        picture->pkt_dts = p->avpkt.dts;
540

    
541
        /*
542
         * A later call with avkpt->size == 0 may loop over all threads,
543
         * including this one, searching for a frame to return before being
544
         * stopped by the "finished != fctx->next_finished" condition.
545
         * Make sure we don't mistakenly return the same frame again.
546
         */
547
        p->got_frame = 0;
548

    
549
        if (finished >= avctx->thread_count) finished = 0;
550
    } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
551

    
552
    update_context_from_thread(avctx, p->avctx, 1);
553

    
554
    if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
555

    
556
    fctx->next_finished = finished;
557

    
558
    return p->result;
559
}
560

    
561
void ff_thread_report_progress(AVFrame *f, int n, int field)
562
{
563
    PerThreadContext *p;
564
    int *progress = f->thread_opaque;
565

    
566
    if (!progress || progress[field] >= n) return;
567

    
568
    p = f->owner->thread_opaque;
569

    
570
    if (f->owner->debug&FF_DEBUG_THREADS)
571
        av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
572

    
573
    pthread_mutex_lock(&p->progress_mutex);
574
    progress[field] = n;
575
    pthread_cond_broadcast(&p->progress_cond);
576
    pthread_mutex_unlock(&p->progress_mutex);
577
}
578

    
579
void ff_thread_await_progress(AVFrame *f, int n, int field)
580
{
581
    PerThreadContext *p;
582
    int *progress = f->thread_opaque;
583

    
584
    if (!progress || progress[field] >= n) return;
585

    
586
    p = f->owner->thread_opaque;
587

    
588
    if (f->owner->debug&FF_DEBUG_THREADS)
589
        av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
590

    
591
    pthread_mutex_lock(&p->progress_mutex);
592
    while (progress[field] < n)
593
        pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
594
    pthread_mutex_unlock(&p->progress_mutex);
595
}
596

    
597
void ff_thread_finish_setup(AVCodecContext *avctx) {
598
    PerThreadContext *p = avctx->thread_opaque;
599

    
600
    if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
601

    
602
    pthread_mutex_lock(&p->progress_mutex);
603
    p->state = STATE_SETUP_FINISHED;
604
    pthread_cond_broadcast(&p->progress_cond);
605
    pthread_mutex_unlock(&p->progress_mutex);
606
}
607

    
608
/// Waits for all threads to finish.
609
static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
610
{
611
    int i;
612

    
613
    for (i = 0; i < thread_count; i++) {
614
        PerThreadContext *p = &fctx->threads[i];
615

    
616
        if (p->state != STATE_INPUT_READY) {
617
            pthread_mutex_lock(&p->progress_mutex);
618
            while (p->state != STATE_INPUT_READY)
619
                pthread_cond_wait(&p->output_cond, &p->progress_mutex);
620
            pthread_mutex_unlock(&p->progress_mutex);
621
        }
622
    }
623
}
624

    
625
static void frame_thread_free(AVCodecContext *avctx, int thread_count)
626
{
627
    FrameThreadContext *fctx = avctx->thread_opaque;
628
    AVCodec *codec = avctx->codec;
629
    int i;
630

    
631
    park_frame_worker_threads(fctx, thread_count);
632

    
633
    if (fctx->prev_thread)
634
        update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
635

    
636
    fctx->die = 1;
637

    
638
    for (i = 0; i < thread_count; i++) {
639
        PerThreadContext *p = &fctx->threads[i];
640

    
641
        pthread_mutex_lock(&p->mutex);
642
        pthread_cond_signal(&p->input_cond);
643
        pthread_mutex_unlock(&p->mutex);
644

    
645
        pthread_join(p->thread, NULL);
646

    
647
        if (codec->close)
648
            codec->close(p->avctx);
649

    
650
        avctx->codec = NULL;
651

    
652
        release_delayed_buffers(p);
653
    }
654

    
655
    for (i = 0; i < thread_count; i++) {
656
        PerThreadContext *p = &fctx->threads[i];
657

    
658
        avcodec_default_free_buffers(p->avctx);
659

    
660
        pthread_mutex_destroy(&p->mutex);
661
        pthread_mutex_destroy(&p->progress_mutex);
662
        pthread_cond_destroy(&p->input_cond);
663
        pthread_cond_destroy(&p->progress_cond);
664
        pthread_cond_destroy(&p->output_cond);
665
        av_freep(&p->avpkt.data);
666

    
667
        if (i)
668
            av_freep(&p->avctx->priv_data);
669

    
670
        av_freep(&p->avctx);
671
    }
672

    
673
    av_freep(&fctx->threads);
674
    pthread_mutex_destroy(&fctx->buffer_mutex);
675
    av_freep(&avctx->thread_opaque);
676
}
677

    
678
static int frame_thread_init(AVCodecContext *avctx)
679
{
680
    int thread_count = avctx->thread_count;
681
    AVCodec *codec = avctx->codec;
682
    AVCodecContext *src = avctx;
683
    FrameThreadContext *fctx;
684
    int i, err = 0;
685

    
686
    avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));
687

    
688
    fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
689
    pthread_mutex_init(&fctx->buffer_mutex, NULL);
690
    fctx->delaying = 1;
691

    
692
    for (i = 0; i < thread_count; i++) {
693
        AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
694
        PerThreadContext *p  = &fctx->threads[i];
695

    
696
        pthread_mutex_init(&p->mutex, NULL);
697
        pthread_mutex_init(&p->progress_mutex, NULL);
698
        pthread_cond_init(&p->input_cond, NULL);
699
        pthread_cond_init(&p->progress_cond, NULL);
700
        pthread_cond_init(&p->output_cond, NULL);
701

    
702
        p->parent = fctx;
703
        p->avctx  = copy;
704

    
705
        *copy = *src;
706
        copy->thread_opaque = p;
707
        copy->pkt = &p->avpkt;
708

    
709
        if (!i) {
710
            src = copy;
711

    
712
            if (codec->init)
713
                err = codec->init(copy);
714

    
715
            update_context_from_thread(avctx, copy, 1);
716
        } else {
717
            copy->is_copy   = 1;
718
            copy->priv_data = av_malloc(codec->priv_data_size);
719
            memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
720

    
721
            if (codec->init_thread_copy)
722
                err = codec->init_thread_copy(copy);
723
        }
724

    
725
        if (err) goto error;
726

    
727
        pthread_create(&p->thread, NULL, frame_worker_thread, p);
728
    }
729

    
730
    return 0;
731

    
732
error:
733
    frame_thread_free(avctx, i+1);
734

    
735
    return err;
736
}
737

    
738
void ff_thread_flush(AVCodecContext *avctx)
739
{
740
    FrameThreadContext *fctx = avctx->thread_opaque;
741

    
742
    if (!avctx->thread_opaque) return;
743

    
744
    park_frame_worker_threads(fctx, avctx->thread_count);
745

    
746
    if (fctx->prev_thread)
747
        update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
748

    
749
    fctx->next_decoding = fctx->next_finished = 0;
750
    fctx->delaying = 1;
751
    fctx->prev_thread = NULL;
752
}
753

    
754
static int *allocate_progress(PerThreadContext *p)
755
{
756
    int i;
757

    
758
    for (i = 0; i < MAX_BUFFERS; i++)
759
        if (!p->progress_used[i]) break;
760

    
761
    if (i == MAX_BUFFERS) {
762
        av_log(p->avctx, AV_LOG_ERROR, "allocate_progress() overflow\n");
763
        return NULL;
764
    }
765

    
766
    p->progress_used[i] = 1;
767

    
768
    return p->progress[i];
769
}
770

    
771
int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
772
{
773
    PerThreadContext *p = avctx->thread_opaque;
774
    int *progress, err;
775

    
776
    f->owner = avctx;
777

    
778
    if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
779
        f->thread_opaque = NULL;
780
        return avctx->get_buffer(avctx, f);
781
    }
782

    
783
    if (p->state != STATE_SETTING_UP &&
784
        (avctx->codec->update_thread_context || !avctx->thread_safe_callbacks)) {
785
        av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
786
        return -1;
787
    }
788

    
789
    pthread_mutex_lock(&p->parent->buffer_mutex);
790
    f->thread_opaque = progress = allocate_progress(p);
791

    
792
    if (!progress) {
793
        pthread_mutex_unlock(&p->parent->buffer_mutex);
794
        return -1;
795
    }
796

    
797
    progress[0] =
798
    progress[1] = -1;
799

    
800
    if (avctx->thread_safe_callbacks ||
801
        avctx->get_buffer == avcodec_default_get_buffer) {
802
        err = avctx->get_buffer(avctx, f);
803
    } else {
804
        p->requested_frame = f;
805
        p->state = STATE_GET_BUFFER;
806
        pthread_mutex_lock(&p->progress_mutex);
807
        pthread_cond_signal(&p->progress_cond);
808

    
809
        while (p->state != STATE_SETTING_UP)
810
            pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
811

    
812
        err = p->result;
813

    
814
        pthread_mutex_unlock(&p->progress_mutex);
815

    
816
        if (!avctx->codec->update_thread_context)
817
            ff_thread_finish_setup(avctx);
818
    }
819

    
820
    pthread_mutex_unlock(&p->parent->buffer_mutex);
821

    
822
    /*
823
     * Buffer age is difficult to keep track of between
824
     * multiple threads, and the optimizations it allows
825
     * are not worth the effort. It is disabled for now.
826
     */
827
    f->age = INT_MAX;
828

    
829
    return err;
830
}
831

    
832
void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
833
{
834
    PerThreadContext *p = avctx->thread_opaque;
835

    
836
    if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
837
        avctx->release_buffer(avctx, f);
838
        return;
839
    }
840

    
841
    if (p->num_released_buffers >= MAX_BUFFERS) {
842
        av_log(p->avctx, AV_LOG_ERROR, "too many thread_release_buffer calls!\n");
843
        return;
844
    }
845

    
846
    if(avctx->debug & FF_DEBUG_BUFFERS)
847
        av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p, %d buffers used\n",
848
                                    f, f->owner->internal_buffer_count);
849

    
850
    p->released_buffers[p->num_released_buffers++] = *f;
851
    memset(f->data, 0, sizeof(f->data));
852
}
853

    
854
/**
855
 * Set the threading algorithms used.
856
 *
857
 * Threading requires more than one thread.
858
 * Frame threading requires entire frames to be passed to the codec,
859
 * and introduces extra decoding delay, so is incompatible with low_delay.
860
 *
861
 * @param avctx The context.
862
 */
863
static void validate_thread_parameters(AVCodecContext *avctx)
864
{
865
    int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
866
                                && !(avctx->flags & CODEC_FLAG_TRUNCATED)
867
                                && !(avctx->flags & CODEC_FLAG_LOW_DELAY)
868
                                && !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
869
    if (avctx->thread_count == 1) {
870
        avctx->active_thread_type = 0;
871
    } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
872
        avctx->active_thread_type = FF_THREAD_FRAME;
873
    } else {
874
        avctx->active_thread_type = FF_THREAD_SLICE;
875
    }
876
}
877

    
878
int ff_thread_init(AVCodecContext *avctx, int thread_count)
879
{
880
    if (avctx->thread_opaque) {
881
        av_log(avctx, AV_LOG_ERROR, "avcodec_thread_init is ignored after avcodec_open\n");
882
        return -1;
883
    }
884

    
885
    avctx->thread_count = FFMAX(1, thread_count);
886

    
887
    if (avctx->codec) {
888
        validate_thread_parameters(avctx);
889

    
890
        if (avctx->active_thread_type&FF_THREAD_SLICE)
891
            return thread_init(avctx);
892
        else if (avctx->active_thread_type&FF_THREAD_FRAME)
893
            return frame_thread_init(avctx);
894
    }
895

    
896
    return 0;
897
}
898

    
899
void ff_thread_free(AVCodecContext *avctx)
900
{
901
    if (avctx->active_thread_type&FF_THREAD_FRAME)
902
        frame_thread_free(avctx, avctx->thread_count);
903
    else
904
        thread_free(avctx);
905
}