Add m-esr52 at 52.6.0

1 files changed, 900 insertions, 0 deletions

diff --git a/media/ffvpx/libavcodec/pthread_frame.c b/media/ffvpx/libavcodec/pthread_frame.c
new file mode 100644
index 000000000..a10fcbfe7
--- /dev/null
+++ b/media/ffvpx/libavcodec/pthread_frame.c
@@ -0,0 +1,900 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * 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.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * 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
+ * License along with FFmpeg; if not, write to the Free Software
+ * 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"
+#include "version.h"
+
+#include "libavutil/avassert.h"
+#include "libavutil/buffer.h"
+#include "libavutil/common.h"
+#include "libavutil/cpu.h"
+#include "libavutil/frame.h"
+#include "libavutil/internal.h"
+#include "libavutil/log.h"
+#include "libavutil/mem.h"
+#include "libavutil/opt.h"
+#include "libavutil/thread.h"
+
+#if defined(MOZ_TSAN)
+typedef  _Atomic(int)  atomic_int;
+#else
+typedef  volatile int  atomic_int;
+#endif
+
+/**
+ * Context used by codec threads and stored in their AVCodecInternal thread_ctx.
+ */
+typedef 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.
+                                 */
+    STATE_GET_FORMAT,           /**<
+                                 * Set when the codec calls get_format().
+                                 * State is returned to STATE_SETTING_UP afterwards.
+                                 */
+    STATE_SETUP_FINISHED        ///< Set after the codec has called ff_thread_finish_setup().
+} State;
+
+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).
+
+    AVFrame *frame;                 ///< Output frame (for decoding) or input (for encoding).
+    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.
+
+    atomic_int 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
+
+    const enum AVPixelFormat *available_formats; ///< Format array for get_format()
+    enum AVPixelFormat result_format;            ///< get_format() result
+
+    int die;                        ///< Set when the thread should exit.
+} PerThreadContext;
+
+/**
+ * Context stored in the client AVCodecInternal thread_ctx.
+ */
+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.
+                                    */
+} FrameThreadContext;
+
+#define THREAD_SAFE_CALLBACKS(avctx) \
+((avctx)->thread_safe_callbacks || (avctx)->get_buffer2 == avcodec_default_get_buffer2)
+
+/**
+ * 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;
+    AVCodecContext *avctx = p->avctx;
+    const AVCodec *codec = avctx->codec;
+
+    pthread_mutex_lock(&p->mutex);
+    while (1) {
+            while (p->state == STATE_INPUT_READY && !p->die)
+                pthread_cond_wait(&p->input_cond, &p->mutex);
+
+        if (p->die) break;
+
+        if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
+            ff_thread_finish_setup(avctx);
+
+        av_frame_unref(p->frame);
+        p->got_frame = 0;
+        p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
+
+        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);
+        }
+
+        if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
+
+        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
+        p->state = STATE_INPUT_READY;
+
+        pthread_cond_broadcast(&p->progress_cond);
+        pthread_cond_signal(&p->output_cond);
+        pthread_mutex_unlock(&p->progress_mutex);
+    }
+    pthread_mutex_unlock(&p->mutex);
+
+    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
+ * @return 0 on success, negative error code on failure
+ */
+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;
+        dst->framerate = src->framerate;
+        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;
+#if FF_API_AFD
+FF_DISABLE_DEPRECATION_WARNINGS
+        dst->dtg_active_format     = src->dtg_active_format;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif /* FF_API_AFD */
+
+        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;
+
+        dst->channels       = src->channels;
+        dst->sample_rate    = src->sample_rate;
+        dst->sample_fmt     = src->sample_fmt;
+        dst->channel_layout = src->channel_layout;
+        dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
+    }
+
+    if (for_user) {
+        dst->delay       = src->thread_count - 1;
+#if FF_API_CODED_FRAME
+FF_DISABLE_DEPRECATION_WARNINGS
+        dst->coded_frame = src->coded_frame;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+    } 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;
+    dst->debug_mv = src->debug_mv;
+
+    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;
+    dst->thread_safe_callbacks = src->thread_safe_callbacks;
+
+    if (src->slice_count && src->slice_offset) {
+        if (dst->slice_count < src->slice_count) {
+            int err = av_reallocp_array(&dst->slice_offset, src->slice_count,
+                                        sizeof(*dst->slice_offset));
+            if (err < 0)
+                return err;
+        }
+        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
+        av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
+                   p->avctx->codec_type == AVMEDIA_TYPE_AUDIO);
+        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;
+
+    if (!avpkt->size && !(codec->capabilities & AV_CODEC_CAP_DELAY))
+        return 0;
+
+    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;
+        }
+    }
+
+    av_packet_unref(&p->avpkt);
+    av_packet_ref(&p->avpkt, avpkt);
+
+    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 && (
+         p->avctx->get_format != avcodec_default_get_format ||
+         p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
+        while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
+            int call_done = 1;
+            pthread_mutex_lock(&p->progress_mutex);
+            while (p->state == STATE_SETTING_UP)
+                pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
+
+            State p_state = (State)p->state;
+            switch (p_state) {
+            case STATE_GET_BUFFER:
+                p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
+                break;
+            case STATE_GET_FORMAT:
+                p->result_format = ff_get_format(p->avctx, p->available_formats);
+                break;
+            default:
+                call_done = 0;
+                break;
+            }
+            if (call_done) {
+                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)
+{
+    FrameThreadContext *fctx = avctx->internal->thread_ctx;
+    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.
+     */
+
+    if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
+        fctx->delaying = 0;
+
+    if (fctx->delaying) {
+        *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);
+        }
+
+        av_frame_move_ref(picture, p->frame);
+        *got_picture_ptr = p->got_frame;
+        picture->pkt_dts = p->avpkt.dts;
+
+        if (p->result < 0)
+            err = p->result;
+
+        /*
+         * 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;
+
+    /*
+     * When no frame was found while flushing, but an error occurred in
+     * any thread, return it instead of 0.
+     * Otherwise the error can get lost.
+     */
+    if (!avpkt->size && !*got_picture_ptr)
+        return err;
+
+    /* 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;
+    atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
+
+    if (!progress || progress[field] >= n) return;
+
+    p = f->owner->internal->thread_ctx;
+
+    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;
+    atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
+
+    if (!progress || progress[field] >= n) return;
+
+    p = f->owner->internal->thread_ctx;
+
+    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) {
+    PerThreadContext *p = avctx->internal->thread_ctx;
+
+    if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
+
+    if(p->state == STATE_SETUP_FINISHED){
+        av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
+    }
+
+    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);
+        }
+        p->got_frame = 0;
+    }
+}
+
+void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
+{
+    FrameThreadContext *fctx = avctx->internal->thread_ctx;
+    const AVCodec *codec = avctx->codec;
+    int i;
+
+    park_frame_worker_threads(fctx, thread_count);
+
+    if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
+        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;
+        }
+
+    for (i = 0; i < thread_count; i++) {
+        PerThreadContext *p = &fctx->threads[i];
+
+        pthread_mutex_lock(&p->mutex);
+        p->die = 1;
+        pthread_cond_signal(&p->input_cond);
+        pthread_mutex_unlock(&p->mutex);
+
+        if (p->thread_init)
+            pthread_join(p->thread, NULL);
+        p->thread_init=0;
+
+        if (codec->close && p->avctx)
+            codec->close(p->avctx);
+
+        release_delayed_buffers(p);
+        av_frame_free(&p->frame);
+    }
+
+    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);
+        av_packet_unref(&p->avpkt);
+        av_freep(&p->released_buffers);
+
+        if (i && p->avctx) {
+            av_freep(&p->avctx->priv_data);
+            av_freep(&p->avctx->slice_offset);
+        }
+
+        if (p->avctx)
+            av_freep(&p->avctx->internal);
+        av_freep(&p->avctx);
+    }
+
+    av_freep(&fctx->threads);
+    pthread_mutex_destroy(&fctx->buffer_mutex);
+    av_freep(&avctx->internal->thread_ctx);
+
+    if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
+        av_opt_free(avctx->priv_data);
+    avctx->codec = NULL;
+}
+
+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();
+        if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
+            nb_cpus = 1;
+        // 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;
+    }
+
+    avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
+    if (!fctx)
+        return AVERROR(ENOMEM);
+
+    fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
+    if (!fctx->threads) {
+        av_freep(&avctx->internal->thread_ctx);
+        return AVERROR(ENOMEM);
+    }
+
+    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);
+
+        p->frame = av_frame_alloc();
+        if (!p->frame) {
+            av_freep(&copy);
+            err = AVERROR(ENOMEM);
+            goto error;
+        }
+
+        p->parent = fctx;
+        p->avctx  = copy;
+
+        if (!copy) {
+            err = AVERROR(ENOMEM);
+            goto error;
+        }
+
+        *copy = *src;
+
+        copy->internal = av_malloc(sizeof(AVCodecInternal));
+        if (!copy->internal) {
+            copy->priv_data = NULL;
+            err = AVERROR(ENOMEM);
+            goto error;
+        }
+        *copy->internal = *src->internal;
+        copy->internal->thread_ctx = p;
+        copy->internal->pkt = &p->avpkt;
+
+        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;
+
+        err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
+        p->thread_init= !err;
+        if(!p->thread_init)
+            goto error;
+    }
+
+    return 0;
+
+error:
+    ff_frame_thread_free(avctx, i+1);
+
+    return err;
+}
+
+void ff_thread_flush(AVCodecContext *avctx)
+{
+    int i;
+    FrameThreadContext *fctx = avctx->internal->thread_ctx;
+
+    if (!fctx) return;
+
+    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;
+        av_frame_unref(p->frame);
+
+        release_delayed_buffers(p);
+
+        if (avctx->codec->flush)
+            avctx->codec->flush(p->avctx);
+    }
+}
+
+int ff_thread_can_start_frame(AVCodecContext *avctx)
+{
+    PerThreadContext *p = avctx->internal->thread_ctx;
+    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)
+{
+    PerThreadContext *p = avctx->internal->thread_ctx;
+    int err;
+
+    f->owner = avctx;
+
+    ff_init_buffer_info(avctx, f->f);
+
+    if (!(avctx->active_thread_type & FF_THREAD_FRAME))
+        return ff_get_buffer(avctx, f->f, flags);
+
+    if (p->state != STATE_SETTING_UP &&
+        (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
+        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);
+    if (avctx->thread_safe_callbacks ||
+        avctx->get_buffer2 == avcodec_default_get_buffer2) {
+        err = ff_get_buffer(avctx, f->f, flags);
+    } else {
+        pthread_mutex_lock(&p->progress_mutex);
+        p->requested_frame = f->f;
+        p->requested_flags = flags;
+        p->state = STATE_GET_BUFFER;
+        pthread_cond_broadcast(&p->progress_cond);
+
+        while (p->state != STATE_SETTING_UP)
+            pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
+
+        err = p->result;
+
+        pthread_mutex_unlock(&p->progress_mutex);
+
+    }
+    if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
+        ff_thread_finish_setup(avctx);
+    if (err)
+        av_buffer_unref(&f->progress);
+
+    pthread_mutex_unlock(&p->parent->buffer_mutex);
+
+    return err;
+}
+
+enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
+{
+    enum AVPixelFormat res;
+    PerThreadContext *p = avctx->internal->thread_ctx;
+    if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
+        avctx->get_format == avcodec_default_get_format)
+        return ff_get_format(avctx, fmt);
+    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;
+}
+
+void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
+{
+    PerThreadContext *p = avctx->internal->thread_ctx;
+    FrameThreadContext *fctx;
+    AVFrame *dst, *tmp;
+    int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
+                          avctx->thread_safe_callbacks                   ||
+                          avctx->get_buffer2 == avcodec_default_get_buffer2;
+
+    if (!f->f || !f->f->buf[0])
+        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);
+}