/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package libavcodec.thread.pthread;

import libavcodec.codec.structure.AVCodecContext;
import libavcodec.codec.structure.AVPacket;
import libavutil.structure.AVFrame;
/**
 *  Created on Nov 17, 2013 5:33:19 PM
 *
 *  pthread, libavcodec/pthread.c
 *
 *  @author ©H.B.M. Raben
 */
public class pthread {

//#include "config.h"

//#include "avcodec.h"
//#include "internal.h"
//#include "thread.h"
//#include "libavutil/avassert.h"
//#include "libavutil/common.h"
//#include "libavutil/cpu.h"

//#if HAVE_PTHREADS
//#include <pthread.h>
//#elif HAVE_W32THREADS
//#include "compat/w32pthreads.h"
//#elif HAVE_OS2THREADS
//#include "compat/os2threads.h"
//#endif

//typedef int (action_func)(AVCodecContext *c, void *arg);
//typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);

//typedef struct ThreadContext {
//    pthread_t *workers;
//    action_func *func;
//    action_func2 *func2;
//    void *args;
//    int *rets;
//    int rets_count;
//    int job_count;
//    int job_size;
//
//    pthread_cond_t last_job_cond;
//    pthread_cond_t current_job_cond;
//    pthread_mutex_t current_job_lock;
//    int current_job;
//    unsigned int current_execute;
//    int done;
//} ThreadContext;

/**
 * Context used by codec threads and stored in their AVCodecContext thread_opaque.
 */
//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).
//    uint8_t       *buf;             ///< backup storage for packet data when the input packet is not refcounted
//    int            allocated_buf_size; ///< Size allocated for buf
//
//    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.
//
//    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;
//
//    /**
//     * 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
//} PerThreadContext;

/**
 * Context stored in the client AVCodecContext thread_opaque.
 */
//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;


/* H264 slice threading seems to be buggy with more than 16 threads,
 * limit the number of threads to 16 for automatic detection */
//#define MAX_AUTO_THREADS 16

static void* attribute_align_arg worker(void *v)
{
    AVCodecContext *avctx = v;
    ThreadContext *c = avctx->thread_opaque;
    int our_job = c->job_count;
    int last_execute = 0;
    int thread_count = avctx->thread_count;
    int self_id;

    pthread_mutex_lock(&c->current_job_lock);
    self_id = c->current_job++;
    for (;;){
        while (our_job >= c->job_count) {
            if (c->current_job == thread_count + c->job_count)
                pthread_cond_signal(&c->last_job_cond);

            while (last_execute == c->current_execute && !c->done)
                pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
            last_execute = c->current_execute;
            our_job = self_id;

            if (c->done) {
                pthread_mutex_unlock(&c->current_job_lock);
                return NULL;
            }
        }
        pthread_mutex_unlock(&c->current_job_lock);

        c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
                                                   c->func2(avctx, c->args, our_job, self_id);

        pthread_mutex_lock(&c->current_job_lock);
        our_job = c->current_job++;
    }
}

//static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
//{
//    while (c->current_job != thread_count + c->job_count)
//        pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
//    pthread_mutex_unlock(&c->current_job_lock);
//}

static void thread_free(AVCodecContext *avctx)
{
    ThreadContext *c = avctx->thread_opaque;
    int i;

    pthread_mutex_lock(&c->current_job_lock);
    c->done = 1;
    pthread_cond_broadcast(&c->current_job_cond);
    pthread_mutex_unlock(&c->current_job_lock);

    for (i=0; i<avctx->thread_count; i++)
         pthread_join(c->workers[i], NULL);

    pthread_mutex_destroy(&c->current_job_lock);
    pthread_cond_destroy(&c->current_job_cond);
    pthread_cond_destroy(&c->last_job_cond);
    av_free(c->workers);
    av_freep(&avctx->thread_opaque);
}

static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
{
    ThreadContext *c= avctx->thread_opaque;
    int dummy_ret;

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

    if (job_count <= 0)
        return 0;

    pthread_mutex_lock(&c->current_job_lock);

    c->current_job = avctx->thread_count;
    c->job_count = job_count;
    c->job_size = job_size;
    c->args = arg;
    c->func = func;
    if (ret) {
        c->rets = ret;
        c->rets_count = job_count;
    } else {
        c->rets = &dummy_ret;
        c->rets_count = 1;
    }
    c->current_execute++;
    pthread_cond_broadcast(&c->current_job_cond);

    avcodec_thread_park_workers(c, avctx->thread_count);

    return 0;
}

static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
{
    ThreadContext *c= avctx->thread_opaque;
    c->func2 = func2;
    return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
}

//static int avcodec_thread_init(AVCodecContext *avctx)
//{
//    int i;
//    ThreadContext *c;
//    int thread_count = avctx->thread_count;
//
//    if (!thread_count) {
//        int nb_cpus = av_cpu_count();
//        if  (avctx->height)
//            nb_cpus = FFMIN(nb_cpus, (avctx->height+15)/16);
//        // 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;
//    }
//
//    c = av_mallocz(sizeof(ThreadContext));
//    if (!c)
//        return -1;
//
//    c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
//    if (!c->workers) {
//        av_free(c);
//        return -1;
//    }
//
//    avctx->thread_opaque = c;
//    c->current_job = 0;
//    c->job_count = 0;
//    c->job_size = 0;
//    c->done = 0;
//    pthread_cond_init(&c->current_job_cond, NULL);
//    pthread_cond_init(&c->last_job_cond, NULL);
//    pthread_mutex_init(&c->current_job_lock, NULL);
//    pthread_mutex_lock(&c->current_job_lock);
//    for (i=0; i<thread_count; i++) {
//        if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
//           avctx->thread_count = i;
//           pthread_mutex_unlock(&c->current_job_lock);
//           ff_thread_free(avctx);
//           return -1;
//        }
//    }
//
//    avcodec_thread_park_workers(c, thread_count);
//
//    avctx->execute = avcodec_thread_execute;
//    avctx->execute2 = avcodec_thread_execute2;
//    return 0;
//}

#define THREAD_SAFE_CALLBACKS(avctx) \
((avctx)->thread_safe_callbacks || (!(avctx)->get_buffer && (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;
//    FrameThreadContext *fctx = p->parent;
//    AVCodecContext *avctx = p->avctx;
//    const AVCodec *codec = avctx->codec;
//
//    pthread_mutex_lock(&p->mutex);
//    while (1) {
//            while (p->state == STATE_INPUT_READY && !fctx->die)
//                pthread_cond_wait(&p->input_cond, &p->mutex);
//
//        if (fctx->die) break;
//
//        if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
//            ff_thread_finish_setup(avctx);
//
//        avcodec_get_frame_defaults(&p->frame);
//        p->got_frame = 0;
//        p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
//
//        /* many decoders assign whole AVFrames, thus overwriting extended_data;
//         * make sure it's set correctly */
//        p->frame.extended_data = p->frame.data;
//
//        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
 */
//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->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;
//        dst->dtg_active_format     = src->dtg_active_format;
//
//        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;
//    }
//
//    if (for_user) {
//        dst->delay       = src->thread_count - 1;
//        dst->coded_frame = src->coded_frame;
//    } 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;
//#if FF_API_GET_BUFFER
//    dst->get_buffer     = src->get_buffer;
//    dst->release_buffer = src->release_buffer;
//#endif
//
//    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 *tmp = av_realloc(dst->slice_offset, src->slice_count *
//                                  sizeof(*dst->slice_offset));
//            if (!tmp) {
//                av_free(dst->slice_offset);
//                return AVERROR(ENOMEM);
//            }
//            dst->slice_offset = tmp;
//        }
//        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 & 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_buffer_unref(&p->avpkt.buf);
    p->avpkt = *avpkt;
    if (avpkt->buf)
        p->avpkt.buf = av_buffer_ref(avpkt->buf);
    else {
        av_fast_malloc(&p->buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
        p->avpkt.data = p->buf;
        memcpy(p->buf, avpkt->data, avpkt->size);
        memset(p->buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
    }

    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 ||
#if FF_API_GET_BUFFER
         p->avctx->get_buffer ||
#endif
         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);

            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 = p->avctx->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->thread_opaque;
    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;

        /*
         * 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;

    /* 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;
    volatile int *progress = f->progress ? (int*)f->progress->data : NULL;

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

    p = f->owner->thread_opaque;

    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;
    volatile int *progress = f->progress ? (int*)f->progress->data : NULL;

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

    p = f->owner->thread_opaque;

    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->thread_opaque;

    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;
    }
}

static void frame_thread_free(AVCodecContext *avctx, int thread_count)
{
    FrameThreadContext *fctx = avctx->thread_opaque;
    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;
        }

    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);
        p->thread_init=0;

        if (codec->close)
            codec->close(p->avctx);

        avctx->codec = NULL;

        release_delayed_buffers(p);
        av_frame_unref(&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_buffer_unref(&p->avpkt.buf);
        av_freep(&p->buf);
        av_freep(&p->released_buffers);

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

        av_freep(&p->avctx);
    }

    av_freep(&fctx->threads);
    pthread_mutex_destroy(&fctx->buffer_mutex);
    av_freep(&avctx->thread_opaque);
}

static int 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 (!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->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));

    fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
    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->parent = fctx;
        p->avctx  = copy;

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

        *copy = *src;
        copy->thread_opaque = p;
        copy->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 = av_malloc(sizeof(AVCodecInternal));
            if (!copy->internal) {
                err = AVERROR(ENOMEM);
                goto error;
            }
            *copy->internal = *src->internal;
            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:
    frame_thread_free(avctx, i+1);

    return err;
}

void ff_thread_flush(AVCodecContext *avctx)
{
    int i;
    FrameThreadContext *fctx = avctx->thread_opaque;

    if (!avctx->thread_opaque) 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);
        if (avctx->codec->flush)
            avctx->codec->flush(fctx->threads[0].avctx);
    }

    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);
    }
}

int ff_thread_can_start_frame(AVCodecContext *avctx)
{
    PerThreadContext *p = avctx->thread_opaque;
    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->thread_opaque;
    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 || (
#if FF_API_GET_BUFFER
        !avctx->get_buffer &&
#endif
        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->thread_opaque;
    if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
        avctx->get_format == avcodec_default_get_format)
        return avctx->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->thread_opaque;
    FrameThreadContext *fctx;
    AVFrame *dst, *tmp;
    int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
                          avctx->thread_safe_callbacks                   ||
                          (
#if FF_API_GET_BUFFER
                           !avctx->get_buffer &&
#endif
                           avctx->get_buffer2 == avcodec_default_get_buffer2);

    if (!f->f->data[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);
}

/**
 * Set the threading algorithms used.
 *
 * Threading requires more than one thread.
 * Frame threading requires entire frames to be passed to the codec,
 * and introduces extra decoding delay, so is incompatible with low_delay.
 *
 * @param avctx The context.
 */
static void validate_thread_parameters(AVCodecContext *avctx)
{
    int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
                                && !(avctx->flags & CODEC_FLAG_TRUNCATED)
                                && !(avctx->flags & CODEC_FLAG_LOW_DELAY)
                                && !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
    if (avctx->thread_count == 1) {
        avctx->active_thread_type = 0;
    } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
        avctx->active_thread_type = FF_THREAD_FRAME;
    } else if (avctx->codec->capabilities & CODEC_CAP_SLICE_THREADS &&
               avctx->thread_type & FF_THREAD_SLICE) {
        avctx->active_thread_type = FF_THREAD_SLICE;
    } else if (!(avctx->codec->capabilities & CODEC_CAP_AUTO_THREADS)) {
        avctx->thread_count       = 1;
        avctx->active_thread_type = 0;
    }

    if (avctx->thread_count > MAX_AUTO_THREADS)
        av_log(avctx, AV_LOG_WARNING,
               "Application has requested %d threads. Using a thread count greater than %d is not recommended.\n",
               avctx->thread_count, MAX_AUTO_THREADS);
}

int ff_thread_init(AVCodecContext *avctx)
{
#if HAVE_W32THREADS
    w32thread_init();
#endif

    validate_thread_parameters(avctx);

    if (avctx->active_thread_type&FF_THREAD_SLICE)
        return avcodec_thread_init(avctx);
    else if (avctx->active_thread_type&FF_THREAD_FRAME)
        return frame_thread_init(avctx);

    return 0;
}

void ff_thread_free(AVCodecContext *avctx)
{
    if (avctx->active_thread_type&FF_THREAD_FRAME)
        frame_thread_free(avctx, avctx->thread_count);
    else
        thread_free(avctx);
}



/**
 * 
 * 
 * 
 * 
 * 
 * 
 * */

//#include "config.h"
//
//#include "avcodec.h"
//#include "internal.h"
//#include "thread.h"
//#include "libavutil/avassert.h"
//#include "libavutil/common.h"
//#include "libavutil/cpu.h"
//
//#if HAVE_PTHREADS
//#include <pthread.h>
//#elif HAVE_W32THREADS
//#include "compat/w32pthreads.h"
//#elif HAVE_OS2THREADS
//#include "compat/os2threads.h"
//#endif
//
//typedef int (action_func)(AVCodecContext *c, void *arg);
//typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
//
//typedef struct ThreadContext {
//    pthread_t *workers;
//    action_func *func;
//    action_func2 *func2;
//    void *args;
//    int *rets;
//    int rets_count;
//    int job_count;
//    int job_size;
//
//    pthread_cond_t last_job_cond;
//    pthread_cond_t current_job_cond;
//    pthread_mutex_t current_job_lock;
//    int current_job;
//    unsigned int current_execute;
//    int done;
//} ThreadContext;
//
///**
// * Context used by codec threads and stored in their AVCodecContext thread_opaque.
// */
//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).
//    uint8_t       *buf;             ///< backup storage for packet data when the input packet is not refcounted
//    int            allocated_buf_size; ///< Size allocated for buf
//
//    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.
//
//    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;
//
//    /**
//     * 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
//} PerThreadContext;
//
///**
// * Context stored in the client AVCodecContext thread_opaque.
// */
//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;
//
//
///* H264 slice threading seems to be buggy with more than 16 threads,
// * limit the number of threads to 16 for automatic detection */
//#define MAX_AUTO_THREADS 16
//
//static void* attribute_align_arg worker(void *v)
//{
//    AVCodecContext *avctx = v;
//    ThreadContext *c = avctx->thread_opaque;
//    int our_job = c->job_count;
//    int last_execute = 0;
//    int thread_count = avctx->thread_count;
//    int self_id;
//
//    pthread_mutex_lock(&c->current_job_lock);
//    self_id = c->current_job++;
//    for (;;){
//        while (our_job >= c->job_count) {
//            if (c->current_job == thread_count + c->job_count)
//                pthread_cond_signal(&c->last_job_cond);
//
//            while (last_execute == c->current_execute && !c->done)
//                pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
//            last_execute = c->current_execute;
//            our_job = self_id;
//
//            if (c->done) {
//                pthread_mutex_unlock(&c->current_job_lock);
//                return NULL;
//            }
//        }
//        pthread_mutex_unlock(&c->current_job_lock);
//
//        c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
//                                                   c->func2(avctx, c->args, our_job, self_id);
//
//        pthread_mutex_lock(&c->current_job_lock);
//        our_job = c->current_job++;
//    }
//}
//
//static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
//{
//    while (c->current_job != thread_count + c->job_count)
//        pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
//    pthread_mutex_unlock(&c->current_job_lock);
//}
//
//static void thread_free(AVCodecContext *avctx)
//{
//    ThreadContext *c = avctx->thread_opaque;
//    int i;
//
//    pthread_mutex_lock(&c->current_job_lock);
//    c->done = 1;
//    pthread_cond_broadcast(&c->current_job_cond);
//    pthread_mutex_unlock(&c->current_job_lock);
//
//    for (i=0; i<avctx->thread_count; i++)
//         pthread_join(c->workers[i], NULL);
//
//    pthread_mutex_destroy(&c->current_job_lock);
//    pthread_cond_destroy(&c->current_job_cond);
//    pthread_cond_destroy(&c->last_job_cond);
//    av_free(c->workers);
//    av_freep(&avctx->thread_opaque);
//}
//
//static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
//{
//    ThreadContext *c= avctx->thread_opaque;
//    int dummy_ret;
//
//    if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
//        return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
//
//    if (job_count <= 0)
//        return 0;
//
//    pthread_mutex_lock(&c->current_job_lock);
//
//    c->current_job = avctx->thread_count;
//    c->job_count = job_count;
//    c->job_size = job_size;
//    c->args = arg;
//    c->func = func;
//    if (ret) {
//        c->rets = ret;
//        c->rets_count = job_count;
//    } else {
//        c->rets = &dummy_ret;
//        c->rets_count = 1;
//    }
//    c->current_execute++;
//    pthread_cond_broadcast(&c->current_job_cond);
//
//    avcodec_thread_park_workers(c, avctx->thread_count);
//
//    return 0;
//}
//
//static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
//{
//    ThreadContext *c= avctx->thread_opaque;
//    c->func2 = func2;
//    return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
//}
//
//static int avcodec_thread_init(AVCodecContext *avctx)
//{
//    int i;
//    ThreadContext *c;
//    int thread_count = avctx->thread_count;
//
//    if (!thread_count) {
//        int nb_cpus = av_cpu_count();
//        if  (avctx->height)
//            nb_cpus = FFMIN(nb_cpus, (avctx->height+15)/16);
//        // 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;
//    }
//
//    c = av_mallocz(sizeof(ThreadContext));
//    if (!c)
//        return -1;
//
//    c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
//    if (!c->workers) {
//        av_free(c);
//        return -1;
//    }
//
//    avctx->thread_opaque = c;
//    c->current_job = 0;
//    c->job_count = 0;
//    c->job_size = 0;
//    c->done = 0;
//    pthread_cond_init(&c->current_job_cond, NULL);
//    pthread_cond_init(&c->last_job_cond, NULL);
//    pthread_mutex_init(&c->current_job_lock, NULL);
//    pthread_mutex_lock(&c->current_job_lock);
//    for (i=0; i<thread_count; i++) {
//        if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
//           avctx->thread_count = i;
//           pthread_mutex_unlock(&c->current_job_lock);
//           ff_thread_free(avctx);
//           return -1;
//        }
//    }
//
//    avcodec_thread_park_workers(c, thread_count);
//
//    avctx->execute = avcodec_thread_execute;
//    avctx->execute2 = avcodec_thread_execute2;
//    return 0;
//}
//
//#define THREAD_SAFE_CALLBACKS(avctx) \
//((avctx)->thread_safe_callbacks || (!(avctx)->get_buffer && (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;
//    FrameThreadContext *fctx = p->parent;
//    AVCodecContext *avctx = p->avctx;
//    const AVCodec *codec = avctx->codec;
//
//    pthread_mutex_lock(&p->mutex);
//    while (1) {
//            while (p->state == STATE_INPUT_READY && !fctx->die)
//                pthread_cond_wait(&p->input_cond, &p->mutex);
//
//        if (fctx->die) break;
//
//        if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
//            ff_thread_finish_setup(avctx);
//
//        avcodec_get_frame_defaults(&p->frame);
//        p->got_frame = 0;
//        p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
//
//        /* many decoders assign whole AVFrames, thus overwriting extended_data;
//         * make sure it's set correctly */
//        p->frame.extended_data = p->frame.data;
//
//        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
// */
//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->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;
//        dst->dtg_active_format     = src->dtg_active_format;
//
//        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;
//    }
//
//    if (for_user) {
//        dst->delay       = src->thread_count - 1;
//        dst->coded_frame = src->coded_frame;
//    } 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;
//#if FF_API_GET_BUFFER
//    dst->get_buffer     = src->get_buffer;
//    dst->release_buffer = src->release_buffer;
//#endif
//
//    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 *tmp = av_realloc(dst->slice_offset, src->slice_count *
//                                  sizeof(*dst->slice_offset));
//            if (!tmp) {
//                av_free(dst->slice_offset);
//                return AVERROR(ENOMEM);
//            }
//            dst->slice_offset = tmp;
//        }
//        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 & 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_buffer_unref(&p->avpkt.buf);
//    p->avpkt = *avpkt;
//    if (avpkt->buf)
//        p->avpkt.buf = av_buffer_ref(avpkt->buf);
//    else {
//        av_fast_malloc(&p->buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
//        p->avpkt.data = p->buf;
//        memcpy(p->buf, avpkt->data, avpkt->size);
//        memset(p->buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
//    }
//
//    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 ||
//#if FF_API_GET_BUFFER
//         p->avctx->get_buffer ||
//#endif
//         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);
//
//            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 = p->avctx->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->thread_opaque;
//    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;
//
//        /*
//         * 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;
//
//    /* 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;
//    volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
//
//    if (!progress || progress[field] >= n) return;
//
//    p = f->owner->thread_opaque;
//
//    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;
//    volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
//
//    if (!progress || progress[field] >= n) return;
//
//    p = f->owner->thread_opaque;
//
//    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->thread_opaque;
//
//    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;
//    }
//}
//
//static void frame_thread_free(AVCodecContext *avctx, int thread_count)
//{
//    FrameThreadContext *fctx = avctx->thread_opaque;
//    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;
//        }
//
//    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);
//        p->thread_init=0;
//
//        if (codec->close)
//            codec->close(p->avctx);
//
//        avctx->codec = NULL;
//
//        release_delayed_buffers(p);
//        av_frame_unref(&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_buffer_unref(&p->avpkt.buf);
//        av_freep(&p->buf);
//        av_freep(&p->released_buffers);
//
//        if (i) {
//            av_freep(&p->avctx->priv_data);
//            av_freep(&p->avctx->internal);
//            av_freep(&p->avctx->slice_offset);
//        }
//
//        av_freep(&p->avctx);
//    }
//
//    av_freep(&fctx->threads);
//    pthread_mutex_destroy(&fctx->buffer_mutex);
//    av_freep(&avctx->thread_opaque);
//}
//
//static int 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 (!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->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));
//
//    fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
//    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->parent = fctx;
//        p->avctx  = copy;
//
//        if (!copy) {
//            err = AVERROR(ENOMEM);
//            goto error;
//        }
//
//        *copy = *src;
//        copy->thread_opaque = p;
//        copy->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 = av_malloc(sizeof(AVCodecInternal));
//            if (!copy->internal) {
//                err = AVERROR(ENOMEM);
//                goto error;
//            }
//            *copy->internal = *src->internal;
//            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:
//    frame_thread_free(avctx, i+1);
//
//    return err;
//}
//
//void ff_thread_flush(AVCodecContext *avctx)
//{
//    int i;
//    FrameThreadContext *fctx = avctx->thread_opaque;
//
//    if (!avctx->thread_opaque) 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);
//        if (avctx->codec->flush)
//            avctx->codec->flush(fctx->threads[0].avctx);
//    }
//
//    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);
//    }
//}
//
//int ff_thread_can_start_frame(AVCodecContext *avctx)
//{
//    PerThreadContext *p = avctx->thread_opaque;
//    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->thread_opaque;
//    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 || (
//#if FF_API_GET_BUFFER
//        !avctx->get_buffer &&
//#endif
//        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->thread_opaque;
//    if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
//        avctx->get_format == avcodec_default_get_format)
//        return avctx->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->thread_opaque;
//    FrameThreadContext *fctx;
//    AVFrame *dst, *tmp;
//    int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
//                          avctx->thread_safe_callbacks                   ||
//                          (
//#if FF_API_GET_BUFFER
//                           !avctx->get_buffer &&
//#endif
//                           avctx->get_buffer2 == avcodec_default_get_buffer2);
//
//    if (!f->f->data[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);
//}
//
///**
// * Set the threading algorithms used.
// *
// * Threading requires more than one thread.
// * Frame threading requires entire frames to be passed to the codec,
// * and introduces extra decoding delay, so is incompatible with low_delay.
// *
// * @param avctx The context.
// */
//static void validate_thread_parameters(AVCodecContext *avctx)
//{
//    int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
//                                && !(avctx->flags & CODEC_FLAG_TRUNCATED)
//                                && !(avctx->flags & CODEC_FLAG_LOW_DELAY)
//                                && !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
//    if (avctx->thread_count == 1) {
//        avctx->active_thread_type = 0;
//    } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
//        avctx->active_thread_type = FF_THREAD_FRAME;
//    } else if (avctx->codec->capabilities & CODEC_CAP_SLICE_THREADS &&
//               avctx->thread_type & FF_THREAD_SLICE) {
//        avctx->active_thread_type = FF_THREAD_SLICE;
//    } else if (!(avctx->codec->capabilities & CODEC_CAP_AUTO_THREADS)) {
//        avctx->thread_count       = 1;
//        avctx->active_thread_type = 0;
//    }
//
//    if (avctx->thread_count > MAX_AUTO_THREADS)
//        av_log(avctx, AV_LOG_WARNING,
//               "Application has requested %d threads. Using a thread count greater than %d is not recommended.\n",
//               avctx->thread_count, MAX_AUTO_THREADS);
//}
//
//int ff_thread_init(AVCodecContext *avctx)
//{
//#if HAVE_W32THREADS
//    w32thread_init();
//#endif
//
//    validate_thread_parameters(avctx);
//
//    if (avctx->active_thread_type&FF_THREAD_SLICE)
//        return avcodec_thread_init(avctx);
//    else if (avctx->active_thread_type&FF_THREAD_FRAME)
//        return frame_thread_init(avctx);
//
//    return 0;
//}
//
//void ff_thread_free(AVCodecContext *avctx)
//{
//    if (avctx->active_thread_type&FF_THREAD_FRAME)
//        frame_thread_free(avctx, avctx->thread_count);
//    else
//        thread_free(avctx);
//}
/*
 */
}

----- Classpath: ---------------------------------------------
bootPath: C:\Program Files\Java\jdk1.8.0_20\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\rt.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\sunrsasign.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_20\jre\classes;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_20\jre\lib\ext\zipfs.jar
classPath: 
sourcePath: D:\MyProjects\Java\ffmpeg-java\src
----- Original exception ---------------------------------------------
java.lang.NullPointerException
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613)
	at com.sun.tools.javac.comp.Attr.attribType(Attr.java:675)
	at com.sun.tools.javac.comp.Attr.attribType(Attr.java:668)
	at com.sun.tools.javac.comp.MemberEnter.visitVarDef(MemberEnter.java:849)
	at com.sun.tools.javadoc.JavadocMemberEnter.visitVarDef(JavadocMemberEnter.java:88)
	at org.netbeans.lib.nbjavac.services.NBJavadocMemberEnter.visitVarDef(NBJavadocMemberEnter.java:90)
	at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:858)
	at com.sun.tools.javac.comp.MemberEnter.memberEnter(MemberEnter.java:461)
	at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1074)
	at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:858)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:682)
	at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:698)
	at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2489)
	at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1630)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613)
	at com.sun.tools.javac.comp.Attr.visitBinary(Attr.java:3279)
	at com.sun.tools.javac.tree.JCTree$JCBinary.accept(JCTree.java:1791)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613)
	at com.sun.tools.javac.comp.Attr.attribArgs(Attr.java:711)
	at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1868)
	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1471)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613)
	at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:662)
	at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1646)
	at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1302)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:682)
	at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:698)
	at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1167)
	at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:915)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:682)
	at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1055)
	at org.netbeans.lib.nbjavac.services.NBAttr.visitMethodDef(NBAttr.java:76)
	at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:784)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:682)
	at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4572)
	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4474)
	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4402)
	at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4377)
	at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1311)
	at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1284)
	at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:469)
	at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:448)
	at org.netbeans.modules.java.source.parsing.JavacParser.moveToPhase(JavacParser.java:664)
	at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:519)
	at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:174)
	at org.netbeans.modules.parsing.impl.TaskProcessor.callGetResult(TaskProcessor.java:620)
	at org.netbeans.modules.parsing.impl.SourceCache.getResult(SourceCache.java:256)
	at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:733)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
	at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)