pthread_frame.c 28.4 KB
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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
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
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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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * 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
 */

/**
 * @file
 * Frame multithreading support functions
 * @see doc/multithreading.txt
 */

#include "config.h"

#include <stdint.h>

#include "avcodec.h"
#include "internal.h"
#include "pthread_internal.h"
#include "thread.h"
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#include "version.h"
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#include "libavutil/avassert.h"
#include "libavutil/buffer.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/frame.h"
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#include "libavutil/internal.h"
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#include "libavutil/log.h"
#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include "libavutil/thread.h"
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/**
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 * Context used by codec threads and stored in their AVCodecInternal thread_ctx.
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 */
typedef struct PerThreadContext {
    struct FrameThreadContext *parent;

    pthread_t      thread;
    int            thread_init;
    pthread_cond_t input_cond;      ///< Used to wait for a new packet from the main thread.
    pthread_cond_t progress_cond;   ///< Used by child threads to wait for progress to change.
    pthread_cond_t output_cond;     ///< Used by the main thread to wait for frames to finish.

    pthread_mutex_t mutex;          ///< Mutex used to protect the contents of the PerThreadContext.
    pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.

    AVCodecContext *avctx;          ///< Context used to decode packets passed to this thread.

    AVPacket       avpkt;           ///< Input packet (for decoding) or output (for encoding).

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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.
    int     result;                 ///< The result of the last codec decode/encode() call.

    enum {
        STATE_INPUT_READY,          ///< Set when the thread is awaiting a packet.
        STATE_SETTING_UP,           ///< Set before the codec has called ff_thread_finish_setup().
        STATE_GET_BUFFER,           /**<
                                     * Set when the codec calls get_buffer().
                                     * State is returned to STATE_SETTING_UP afterwards.
                                     */
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        STATE_GET_FORMAT,           /**<
                                     * Set when the codec calls get_format().
                                     * State is returned to STATE_SETTING_UP afterwards.
                                     */
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        STATE_SETUP_FINISHED        ///< Set after the codec has called ff_thread_finish_setup().
    } state;

    /**
     * Array of frames passed to ff_thread_release_buffer().
     * Frames are released after all threads referencing them are finished.
     */
    AVFrame *released_buffers;
    int  num_released_buffers;
    int      released_buffers_allocated;

    AVFrame *requested_frame;       ///< AVFrame the codec passed to get_buffer()
    int      requested_flags;       ///< flags passed to get_buffer() for requested_frame
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    const enum AVPixelFormat *available_formats; ///< Format array for get_format()
    enum AVPixelFormat result_format;            ///< get_format() result
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} PerThreadContext;

/**
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 * Context stored in the client AVCodecInternal thread_ctx.
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 */
typedef struct FrameThreadContext {
    PerThreadContext *threads;     ///< The contexts for each thread.
    PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.

    pthread_mutex_t buffer_mutex;  ///< Mutex used to protect get/release_buffer().

    int next_decoding;             ///< The next context to submit a packet to.
    int next_finished;             ///< The next context to return output from.

    int delaying;                  /**<
                                    * Set for the first N packets, where N is the number of threads.
                                    * While it is set, ff_thread_en/decode_frame won't return any results.
                                    */

    int die;                       ///< Set when threads should exit.
} FrameThreadContext;

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#define THREAD_SAFE_CALLBACKS(avctx) \
((avctx)->thread_safe_callbacks || (avctx)->get_buffer2 == avcodec_default_get_buffer2)
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/**
 * Codec worker thread.
 *
 * Automatically calls ff_thread_finish_setup() if the codec does
 * not provide an update_thread_context method, or if the codec returns
 * before calling it.
 */
static attribute_align_arg void *frame_worker_thread(void *arg)
{
    PerThreadContext *p = arg;
    FrameThreadContext *fctx = p->parent;
    AVCodecContext *avctx = p->avctx;
    const AVCodec *codec = avctx->codec;

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    pthread_mutex_lock(&p->mutex);
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    while (1) {
            while (p->state == STATE_INPUT_READY && !fctx->die)
                pthread_cond_wait(&p->input_cond, &p->mutex);

        if (fctx->die) break;

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        if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
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            ff_thread_finish_setup(avctx);

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        av_frame_unref(p->frame);
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        p->got_frame = 0;
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        p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
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        if ((p->result < 0 || !p->got_frame) && p->frame->buf[0]) {
            if (avctx->internal->allocate_progress)
                av_log(avctx, AV_LOG_ERROR, "A frame threaded decoder did not "
                       "free the frame on failure. This is a bug, please report it.\n");
            av_frame_unref(p->frame);
        }

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

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        pthread_mutex_lock(&p->progress_mutex);
#if 0 //BUFREF-FIXME
        for (i = 0; i < MAX_BUFFERS; i++)
            if (p->progress_used[i] && (p->got_frame || p->result<0 || avctx->codec_id != AV_CODEC_ID_H264)) {
                p->progress[i][0] = INT_MAX;
                p->progress[i][1] = INT_MAX;
            }
#endif
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        p->state = STATE_INPUT_READY;

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        pthread_cond_broadcast(&p->progress_cond);
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        pthread_cond_signal(&p->output_cond);
        pthread_mutex_unlock(&p->progress_mutex);
    }
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    pthread_mutex_unlock(&p->mutex);
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    return NULL;
}

/**
 * Update the next thread's AVCodecContext with values from the reference thread's context.
 *
 * @param dst The destination context.
 * @param src The source context.
 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
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 * @return 0 on success, negative error code on failure
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 */
static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
{
    int err = 0;

    if (dst != src) {
        dst->time_base = src->time_base;
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        dst->framerate = src->framerate;
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        dst->width     = src->width;
        dst->height    = src->height;
        dst->pix_fmt   = src->pix_fmt;

        dst->coded_width  = src->coded_width;
        dst->coded_height = src->coded_height;

        dst->has_b_frames = src->has_b_frames;
        dst->idct_algo    = src->idct_algo;

        dst->bits_per_coded_sample = src->bits_per_coded_sample;
        dst->sample_aspect_ratio   = src->sample_aspect_ratio;
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#if FF_API_AFD
FF_DISABLE_DEPRECATION_WARNINGS
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        dst->dtg_active_format     = src->dtg_active_format;
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FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_AFD */
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        dst->profile = src->profile;
        dst->level   = src->level;

        dst->bits_per_raw_sample = src->bits_per_raw_sample;
        dst->ticks_per_frame     = src->ticks_per_frame;
        dst->color_primaries     = src->color_primaries;

        dst->color_trc   = src->color_trc;
        dst->colorspace  = src->colorspace;
        dst->color_range = src->color_range;
        dst->chroma_sample_location = src->chroma_sample_location;

        dst->hwaccel = src->hwaccel;
        dst->hwaccel_context = src->hwaccel_context;
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        dst->channels       = src->channels;
        dst->sample_rate    = src->sample_rate;
        dst->sample_fmt     = src->sample_fmt;
        dst->channel_layout = src->channel_layout;
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        dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
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    }

    if (for_user) {
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        dst->delay       = src->thread_count - 1;
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#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
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        dst->coded_frame = src->coded_frame;
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FF_ENABLE_DEPRECATION_WARNINGS
#endif
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    } else {
        if (dst->codec->update_thread_context)
            err = dst->codec->update_thread_context(dst, src);
    }

    return err;
}

/**
 * Update the next thread's AVCodecContext with values set by the user.
 *
 * @param dst The destination context.
 * @param src The source context.
 * @return 0 on success, negative error code on failure
 */
static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
{
#define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
    dst->flags          = src->flags;

    dst->draw_horiz_band= src->draw_horiz_band;
    dst->get_buffer2    = src->get_buffer2;

    dst->opaque   = src->opaque;
    dst->debug    = src->debug;
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    dst->debug_mv = src->debug_mv;
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    dst->slice_flags = src->slice_flags;
    dst->flags2      = src->flags2;

    copy_fields(skip_loop_filter, subtitle_header);

    dst->frame_number     = src->frame_number;
    dst->reordered_opaque = src->reordered_opaque;
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    dst->thread_safe_callbacks = src->thread_safe_callbacks;
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    if (src->slice_count && src->slice_offset) {
        if (dst->slice_count < src->slice_count) {
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            int err = av_reallocp_array(&dst->slice_offset, src->slice_count,
                                        sizeof(*dst->slice_offset));
            if (err < 0)
                return err;
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        }
        memcpy(dst->slice_offset, src->slice_offset,
               src->slice_count * sizeof(*dst->slice_offset));
    }
    dst->slice_count = src->slice_count;
    return 0;
#undef copy_fields
}

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

    while (p->num_released_buffers > 0) {
        AVFrame *f;

        pthread_mutex_lock(&fctx->buffer_mutex);

        // fix extended data in case the caller screwed it up
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        av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
                   p->avctx->codec_type == AVMEDIA_TYPE_AUDIO);
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        f = &p->released_buffers[--p->num_released_buffers];
        f->extended_data = f->data;
        av_frame_unref(f);

        pthread_mutex_unlock(&fctx->buffer_mutex);
    }
}

static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
{
    FrameThreadContext *fctx = p->parent;
    PerThreadContext *prev_thread = fctx->prev_thread;
    const AVCodec *codec = p->avctx->codec;

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    if (!avpkt->size && !(codec->capabilities & AV_CODEC_CAP_DELAY))
        return 0;
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    pthread_mutex_lock(&p->mutex);

    release_delayed_buffers(p);

    if (prev_thread) {
        int err;
        if (prev_thread->state == STATE_SETTING_UP) {
            pthread_mutex_lock(&prev_thread->progress_mutex);
            while (prev_thread->state == STATE_SETTING_UP)
                pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
            pthread_mutex_unlock(&prev_thread->progress_mutex);
        }

        err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
        if (err) {
            pthread_mutex_unlock(&p->mutex);
            return err;
        }
    }

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    av_packet_unref(&p->avpkt);
    av_packet_ref(&p->avpkt, avpkt);
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    p->state = STATE_SETTING_UP;
    pthread_cond_signal(&p->input_cond);
    pthread_mutex_unlock(&p->mutex);

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

    if (!p->avctx->thread_safe_callbacks && (
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         p->avctx->get_format != avcodec_default_get_format ||
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         p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
        while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
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            int call_done = 1;
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            pthread_mutex_lock(&p->progress_mutex);
            while (p->state == STATE_SETTING_UP)
                pthread_cond_wait(&p->progress_cond, &p->progress_mutex);

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            switch (p->state) {
            case STATE_GET_BUFFER:
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                p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
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                break;
            case STATE_GET_FORMAT:
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                p->result_format = ff_get_format(p->avctx, p->available_formats);
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                break;
            default:
                call_done = 0;
                break;
            }
            if (call_done) {
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                p->state  = STATE_SETTING_UP;
                pthread_cond_signal(&p->progress_cond);
            }
            pthread_mutex_unlock(&p->progress_mutex);
        }
    }

    fctx->prev_thread = p;
    fctx->next_decoding++;

    return 0;
}

int ff_thread_decode_frame(AVCodecContext *avctx,
                           AVFrame *picture, int *got_picture_ptr,
                           AVPacket *avpkt)
{
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    FrameThreadContext *fctx = avctx->internal->thread_ctx;
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    int finished = fctx->next_finished;
    PerThreadContext *p;
    int err;

    /*
     * Submit a packet to the next decoding thread.
     */

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

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

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    if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
        fctx->delaying = 0;
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    if (fctx->delaying) {
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        *got_picture_ptr=0;
        if (avpkt->size)
            return avpkt->size;
    }

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

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

        if (p->state != STATE_INPUT_READY) {
            pthread_mutex_lock(&p->progress_mutex);
            while (p->state != STATE_INPUT_READY)
                pthread_cond_wait(&p->output_cond, &p->progress_mutex);
            pthread_mutex_unlock(&p->progress_mutex);
        }

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        av_frame_move_ref(picture, p->frame);
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        *got_picture_ptr = p->got_frame;
        picture->pkt_dts = p->avpkt.dts;

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        if (p->result < 0)
            err = p->result;

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

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

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

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

    fctx->next_finished = finished;

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    /*
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     * When no frame was found while flushing, but an error occurred in
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     * any thread, return it instead of 0.
     * Otherwise the error can get lost.
     */
    if (!avpkt->size && !*got_picture_ptr)
        return err;

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    /* return the size of the consumed packet if no error occurred */
    return (p->result >= 0) ? avpkt->size : p->result;
}

void ff_thread_report_progress(ThreadFrame *f, int n, int field)
{
    PerThreadContext *p;
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    volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
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    if (!progress || progress[field] >= n) return;

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    p = f->owner->internal->thread_ctx;
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    if (f->owner->debug&FF_DEBUG_THREADS)
        av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);

    pthread_mutex_lock(&p->progress_mutex);
    progress[field] = n;
    pthread_cond_broadcast(&p->progress_cond);
    pthread_mutex_unlock(&p->progress_mutex);
}

void ff_thread_await_progress(ThreadFrame *f, int n, int field)
{
    PerThreadContext *p;
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    volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
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    if (!progress || progress[field] >= n) return;

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

    pthread_mutex_lock(&p->progress_mutex);
    while (progress[field] < n)
        pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
    pthread_mutex_unlock(&p->progress_mutex);
}

void ff_thread_finish_setup(AVCodecContext *avctx) {
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    PerThreadContext *p = avctx->internal->thread_ctx;
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    if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;

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    if(p->state == STATE_SETUP_FINISHED){
        av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
    }

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    pthread_mutex_lock(&p->progress_mutex);
    p->state = STATE_SETUP_FINISHED;
    pthread_cond_broadcast(&p->progress_cond);
    pthread_mutex_unlock(&p->progress_mutex);
}

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

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

        if (p->state != STATE_INPUT_READY) {
            pthread_mutex_lock(&p->progress_mutex);
            while (p->state != STATE_INPUT_READY)
                pthread_cond_wait(&p->output_cond, &p->progress_mutex);
            pthread_mutex_unlock(&p->progress_mutex);
        }
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        p->got_frame = 0;
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    }
}

void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
{
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    FrameThreadContext *fctx = avctx->internal->thread_ctx;
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    const AVCodec *codec = avctx->codec;
    int i;

    park_frame_worker_threads(fctx, thread_count);

    if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
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        if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
            av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");
            fctx->prev_thread->avctx->internal->is_copy = fctx->threads->avctx->internal->is_copy;
            fctx->threads->avctx->internal->is_copy = 1;
        }
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    fctx->die = 1;

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

        pthread_mutex_lock(&p->mutex);
        pthread_cond_signal(&p->input_cond);
        pthread_mutex_unlock(&p->mutex);

        if (p->thread_init)
            pthread_join(p->thread, NULL);
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        p->thread_init=0;
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        if (codec->close && p->avctx)
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            codec->close(p->avctx);

        release_delayed_buffers(p);
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        av_frame_free(&p->frame);
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    }

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

        pthread_mutex_destroy(&p->mutex);
        pthread_mutex_destroy(&p->progress_mutex);
        pthread_cond_destroy(&p->input_cond);
        pthread_cond_destroy(&p->progress_cond);
        pthread_cond_destroy(&p->output_cond);
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        av_packet_unref(&p->avpkt);
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        av_freep(&p->released_buffers);

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        if (i && p->avctx) {
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            av_freep(&p->avctx->priv_data);
            av_freep(&p->avctx->slice_offset);
        }

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        if (p->avctx)
            av_freep(&p->avctx->internal);
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        av_freep(&p->avctx);
    }

    av_freep(&fctx->threads);
    pthread_mutex_destroy(&fctx->buffer_mutex);
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    av_freep(&avctx->internal->thread_ctx);
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    if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
        av_opt_free(avctx->priv_data);
    avctx->codec = NULL;
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}

int ff_frame_thread_init(AVCodecContext *avctx)
{
    int thread_count = avctx->thread_count;
    const AVCodec *codec = avctx->codec;
    AVCodecContext *src = avctx;
    FrameThreadContext *fctx;
    int i, err = 0;

#if HAVE_W32THREADS
    w32thread_init();
#endif

    if (!thread_count) {
        int nb_cpus = av_cpu_count();
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        if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
            nb_cpus = 1;
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        // use number of cores + 1 as thread count if there is more than one
        if (nb_cpus > 1)
            thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
        else
            thread_count = avctx->thread_count = 1;
    }

    if (thread_count <= 1) {
        avctx->active_thread_type = 0;
        return 0;
    }

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    avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
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    if (!fctx)
        return AVERROR(ENOMEM);
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    fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
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    if (!fctx->threads) {
        av_freep(&avctx->internal->thread_ctx);
        return AVERROR(ENOMEM);
    }

644 645 646 647 648 649 650 651 652 653 654 655 656
    pthread_mutex_init(&fctx->buffer_mutex, NULL);
    fctx->delaying = 1;

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

        pthread_mutex_init(&p->mutex, NULL);
        pthread_mutex_init(&p->progress_mutex, NULL);
        pthread_cond_init(&p->input_cond, NULL);
        pthread_cond_init(&p->progress_cond, NULL);
        pthread_cond_init(&p->output_cond, NULL);

657 658
        p->frame = av_frame_alloc();
        if (!p->frame) {
659
            av_freep(&copy);
660 661 662 663
            err = AVERROR(ENOMEM);
            goto error;
        }

664 665 666 667 668 669 670 671 672 673
        p->parent = fctx;
        p->avctx  = copy;

        if (!copy) {
            err = AVERROR(ENOMEM);
            goto error;
        }

        *copy = *src;

674 675
        copy->internal = av_malloc(sizeof(AVCodecInternal));
        if (!copy->internal) {
676
            copy->priv_data = NULL;
677 678 679 680 681
            err = AVERROR(ENOMEM);
            goto error;
        }
        *copy->internal = *src->internal;
        copy->internal->thread_ctx = p;
682
        copy->internal->pkt = &p->avpkt;
683

684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705
        if (!i) {
            src = copy;

            if (codec->init)
                err = codec->init(copy);

            update_context_from_thread(avctx, copy, 1);
        } else {
            copy->priv_data = av_malloc(codec->priv_data_size);
            if (!copy->priv_data) {
                err = AVERROR(ENOMEM);
                goto error;
            }
            memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
            copy->internal->is_copy = 1;

            if (codec->init_thread_copy)
                err = codec->init_thread_copy(copy);
        }

        if (err) goto error;

706 707 708 709
        err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
        p->thread_init= !err;
        if(!p->thread_init)
            goto error;
710 711 712 713 714 715 716 717 718 719 720 721 722
    }

    return 0;

error:
    ff_frame_thread_free(avctx, i+1);

    return err;
}

void ff_thread_flush(AVCodecContext *avctx)
{
    int i;
723
    FrameThreadContext *fctx = avctx->internal->thread_ctx;
724

725
    if (!fctx) return;
726 727 728 729 730 731 732 733 734 735 736 737 738 739

    park_frame_worker_threads(fctx, avctx->thread_count);
    if (fctx->prev_thread) {
        if (fctx->prev_thread != &fctx->threads[0])
            update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
    }

    fctx->next_decoding = fctx->next_finished = 0;
    fctx->delaying = 1;
    fctx->prev_thread = NULL;
    for (i = 0; i < avctx->thread_count; i++) {
        PerThreadContext *p = &fctx->threads[i];
        // Make sure decode flush calls with size=0 won't return old frames
        p->got_frame = 0;
740
        av_frame_unref(p->frame);
741 742

        release_delayed_buffers(p);
743 744 745

        if (avctx->codec->flush)
            avctx->codec->flush(p->avctx);
746 747 748
    }
}

749 750
int ff_thread_can_start_frame(AVCodecContext *avctx)
{
751
    PerThreadContext *p = avctx->internal->thread_ctx;
752 753 754 755 756 757 758 759
    if ((avctx->active_thread_type&FF_THREAD_FRAME) && p->state != STATE_SETTING_UP &&
        (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
        return 0;
    }
    return 1;
}

static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int flags)
760
{
761
    PerThreadContext *p = avctx->internal->thread_ctx;
762 763 764 765
    int err;

    f->owner = avctx;

766 767
    ff_init_buffer_info(avctx, f->f);

768 769 770 771
    if (!(avctx->active_thread_type & FF_THREAD_FRAME))
        return ff_get_buffer(avctx, f->f, flags);

    if (p->state != STATE_SETTING_UP &&
772
        (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788
        av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
        return -1;
    }

    if (avctx->internal->allocate_progress) {
        int *progress;
        f->progress = av_buffer_alloc(2 * sizeof(int));
        if (!f->progress) {
            return AVERROR(ENOMEM);
        }
        progress = (int*)f->progress->data;

        progress[0] = progress[1] = -1;
    }

    pthread_mutex_lock(&p->parent->buffer_mutex);
789 790
    if (avctx->thread_safe_callbacks ||
        avctx->get_buffer2 == avcodec_default_get_buffer2) {
791 792
        err = ff_get_buffer(avctx, f->f, flags);
    } else {
793
        pthread_mutex_lock(&p->progress_mutex);
794 795 796
        p->requested_frame = f->f;
        p->requested_flags = flags;
        p->state = STATE_GET_BUFFER;
797
        pthread_cond_broadcast(&p->progress_cond);
798 799 800 801 802 803 804 805 806

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

        err = p->result;

        pthread_mutex_unlock(&p->progress_mutex);

    }
807
    if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
808 809 810 811 812 813 814 815 816
        ff_thread_finish_setup(avctx);
    if (err)
        av_buffer_unref(&f->progress);

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

    return err;
}

817 818 819
enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
{
    enum AVPixelFormat res;
820
    PerThreadContext *p = avctx->internal->thread_ctx;
821 822
    if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
        avctx->get_format == avcodec_default_get_format)
823
        return ff_get_format(avctx, fmt);
824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850
    if (p->state != STATE_SETTING_UP) {
        av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");
        return -1;
    }
    pthread_mutex_lock(&p->progress_mutex);
    p->available_formats = fmt;
    p->state = STATE_GET_FORMAT;
    pthread_cond_broadcast(&p->progress_cond);

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

    res = p->result_format;

    pthread_mutex_unlock(&p->progress_mutex);

    return res;
}

int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
{
    int ret = thread_get_buffer_internal(avctx, f, flags);
    if (ret < 0)
        av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
    return ret;
}

851 852
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
{
853
    PerThreadContext *p = avctx->internal->thread_ctx;
854 855 856 857
    FrameThreadContext *fctx;
    AVFrame *dst, *tmp;
    int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
                          avctx->thread_safe_callbacks                   ||
858
                          avctx->get_buffer2 == avcodec_default_get_buffer2;
859

860
    if (!f->f || !f->f->buf[0])
861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893
        return;

    if (avctx->debug & FF_DEBUG_BUFFERS)
        av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);

    av_buffer_unref(&f->progress);
    f->owner    = NULL;

    if (can_direct_free) {
        av_frame_unref(f->f);
        return;
    }

    fctx = p->parent;
    pthread_mutex_lock(&fctx->buffer_mutex);

    if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
        goto fail;
    tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,
                          (p->num_released_buffers + 1) *
                          sizeof(*p->released_buffers));
    if (!tmp)
        goto fail;
    p->released_buffers = tmp;

    dst = &p->released_buffers[p->num_released_buffers];
    av_frame_move_ref(dst, f->f);

    p->num_released_buffers++;

fail:
    pthread_mutex_unlock(&fctx->buffer_mutex);
}