X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fpthread.c;h=3b3f3ad8b48be803ffea136470627a7f49f4e899;hb=fa1749dd34c55fb997c97dfc4da9383c9976ab91;hp=00e419bf0c2fc8ec649881767b383d466b2f4273;hpb=37b00b47cbeecd66bb34c5c7c534d016d6e8da24;p=ffmpeg

diff --git a/libavcodec/pthread.c b/libavcodec/pthread.c
index 00e419bf0c2..3b3f3ad8b48 100644
--- a/libavcodec/pthread.c
+++ b/libavcodec/pthread.c
@@ -6,20 +6,20 @@
  * to Michael Niedermayer <michaelni@gmx.at> for writing initial
  * implementation.
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
@@ -29,823 +29,11 @@
  * @see doc/multithreading.txt
  */
 
-#include <pthread.h>
-
 #include "avcodec.h"
+#include "internal.h"
+#include "pthread_internal.h"
 #include "thread.h"
 
-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;
-    int done;
-} ThreadContext;
-
-/// Max number of frame buffers that can be allocated when using frame threads.
-#define MAX_BUFFERS 32
-
-/**
- * Context used by codec threads and stored in their AVCodecContext thread_opaque.
- */
-typedef struct PerThreadContext {
-    struct FrameThreadContext *parent;
-
-    pthread_t      thread;
-    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).
-    int            allocated_buf_size; ///< Size allocated for avpkt.data
-
-    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_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[MAX_BUFFERS];
-    int     num_released_buffers;
-
-    /**
-     * Array of progress values used by ff_thread_get_buffer().
-     */
-    int     progress[MAX_BUFFERS][2];
-    uint8_t progress_used[MAX_BUFFERS];
-
-    AVFrame *requested_frame;       ///< AVFrame the codec passed to get_buffer()
-} 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;
-
-static void* attribute_align_arg worker(void *v)
-{
-    AVCodecContext *avctx = v;
-    ThreadContext *c = avctx->thread_opaque;
-    int our_job = c->job_count;
-    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);
-
-            pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
-            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)
-{
-    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;
-    }
-    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 thread_init(AVCodecContext *avctx)
-{
-    int i;
-    ThreadContext *c;
-    int thread_count = avctx->thread_count;
-
-    if (thread_count <= 1)
-        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);
-           avcodec_thread_free(avctx);
-           return -1;
-        }
-    }
-
-    avcodec_thread_park_workers(c, thread_count);
-
-    avctx->execute = avcodec_thread_execute;
-    avctx->execute2 = avcodec_thread_execute2;
-    return 0;
-}
-
-/**
- * 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;
-    AVCodec *codec = avctx->codec;
-
-    while (1) {
-        if (p->state == STATE_INPUT_READY && !fctx->die) {
-            pthread_mutex_lock(&p->mutex);
-            while (p->state == STATE_INPUT_READY && !fctx->die)
-                pthread_cond_wait(&p->input_cond, &p->mutex);
-            pthread_mutex_unlock(&p->mutex);
-        }
-
-        if (fctx->die) break;
-
-        if (!codec->update_thread_context) ff_thread_finish_setup(avctx);
-
-        pthread_mutex_lock(&p->mutex);
-        avcodec_get_frame_defaults(&p->frame);
-        p->got_frame = 0;
-        p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
-
-        if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
-
-        p->state = STATE_INPUT_READY;
-
-        pthread_mutex_lock(&p->progress_mutex);
-        pthread_cond_signal(&p->output_cond);
-        pthread_mutex_unlock(&p->progress_mutex);
-
-        pthread_mutex_unlock(&p->mutex);
-    }
-
-    return NULL;
-}
-
-/**
- * Updates 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->sub_id    = src->sub_id;
-        dst->time_base = src->time_base;
-        dst->width     = src->width;
-        dst->height    = src->height;
-        dst->pix_fmt   = src->pix_fmt;
-
-        dst->has_b_frames = src->has_b_frames;
-        dst->idct_algo    = src->idct_algo;
-        dst->slice_count  = src->slice_count;
-
-        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;
-    }
-
-    if (for_user) {
-        dst->coded_frame   = src->coded_frame;
-        dst->has_b_frames += src->thread_count - 1;
-    } 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.
- */
-static void 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_buffer     = src->get_buffer;
-    dst->release_buffer = src->release_buffer;
-
-    dst->opaque   = src->opaque;
-    dst->hurry_up = src->hurry_up;
-    dst->dsp_mask = src->dsp_mask;
-    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, bidir_refine);
-
-    dst->frame_number     = src->frame_number;
-    dst->reordered_opaque = src->reordered_opaque;
-#undef copy_fields
-}
-
-static void free_progress(AVFrame *f)
-{
-    PerThreadContext *p = f->owner->thread_opaque;
-    int *progress = f->thread_opaque;
-
-    p->progress_used[(progress - p->progress[0]) / 2] = 0;
-}
-
-/// 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 = &p->released_buffers[--p->num_released_buffers];
-
-        pthread_mutex_lock(&fctx->buffer_mutex);
-        free_progress(f);
-        f->thread_opaque = NULL;
-
-        f->owner->release_buffer(f->owner, 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;
-    AVCodec *codec = p->avctx->codec;
-    uint8_t *buf = p->avpkt.data;
-
-    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_fast_malloc(&buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
-    p->avpkt = *avpkt;
-    p->avpkt.data = buf;
-    memcpy(buf, avpkt->data, avpkt->size);
-    memset(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_buffer != avcodec_default_get_buffer) {
-        while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
-            pthread_mutex_lock(&p->progress_mutex);
-            while (p->state == STATE_SETTING_UP)
-                pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
-
-            if (p->state == STATE_GET_BUFFER) {
-                p->result = p->avctx->get_buffer(p->avctx, p->requested_frame);
-                p->state  = STATE_SETTING_UP;
-                pthread_cond_signal(&p->progress_cond);
-            }
-            pthread_mutex_unlock(&p->progress_mutex);
-        }
-    }
-
-    fctx->prev_thread = p;
-
-    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];
-    update_context_from_user(p->avctx, avctx);
-    err = submit_packet(p, avpkt);
-    if (err) return err;
-
-    fctx->next_decoding++;
-
-    /*
-     * If we're still receiving the initial packets, don't return a frame.
-     */
-
-    if (fctx->delaying && avpkt->size) {
-        if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;
-
-        *got_picture_ptr=0;
-        return 0;
-    }
-
-    /*
-     * 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);
-        }
-
-        *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 p->result;
-}
-
-void ff_thread_report_progress(AVFrame *f, int n, int field)
-{
-    PerThreadContext *p;
-    int *progress = f->thread_opaque;
-
-    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(AVFrame *f, int n, int field)
-{
-    PerThreadContext *p;
-    int *progress = f->thread_opaque;
-
-    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;
-
-    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);
-        }
-    }
-}
-
-static void frame_thread_free(AVCodecContext *avctx, int thread_count)
-{
-    FrameThreadContext *fctx = avctx->thread_opaque;
-    AVCodec *codec = avctx->codec;
-    int i;
-
-    park_frame_worker_threads(fctx, thread_count);
-
-    if (fctx->prev_thread)
-        update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
-
-    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);
-
-        pthread_join(p->thread, NULL);
-
-        if (codec->close)
-            codec->close(p->avctx);
-
-        avctx->codec = NULL;
-
-        release_delayed_buffers(p);
-    }
-
-    for (i = 0; i < thread_count; i++) {
-        PerThreadContext *p = &fctx->threads[i];
-
-        avcodec_default_free_buffers(p->avctx);
-
-        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_freep(&p->avpkt.data);
-
-        if (i)
-            av_freep(&p->avctx->priv_data);
-
-        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;
-    AVCodec *codec = avctx->codec;
-    AVCodecContext *src = avctx;
-    FrameThreadContext *fctx;
-    int i, err = 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;
-
-        *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->is_copy   = 1;
-            copy->priv_data = av_malloc(codec->priv_data_size);
-            memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
-
-            if (codec->init_thread_copy)
-                err = codec->init_thread_copy(copy);
-        }
-
-        if (err) goto error;
-
-        pthread_create(&p->thread, NULL, frame_worker_thread, p);
-    }
-
-    return 0;
-
-error:
-    frame_thread_free(avctx, i+1);
-
-    return err;
-}
-
-void ff_thread_flush(AVCodecContext *avctx)
-{
-    FrameThreadContext *fctx = avctx->thread_opaque;
-
-    if (!avctx->thread_opaque) return;
-
-    park_frame_worker_threads(fctx, avctx->thread_count);
-
-    if (fctx->prev_thread)
-        update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
-
-    fctx->next_decoding = fctx->next_finished = 0;
-    fctx->delaying = 1;
-    fctx->prev_thread = NULL;
-}
-
-static int *allocate_progress(PerThreadContext *p)
-{
-    int i;
-
-    for (i = 0; i < MAX_BUFFERS; i++)
-        if (!p->progress_used[i]) break;
-
-    if (i == MAX_BUFFERS) {
-        av_log(p->avctx, AV_LOG_ERROR, "allocate_progress() overflow\n");
-        return NULL;
-    }
-
-    p->progress_used[i] = 1;
-
-    return p->progress[i];
-}
-
-int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
-{
-    PerThreadContext *p = avctx->thread_opaque;
-    int *progress, err;
-
-    f->owner = avctx;
-
-    if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
-        f->thread_opaque = NULL;
-        return avctx->get_buffer(avctx, f);
-    }
-
-    if (p->state != STATE_SETTING_UP) {
-        av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
-        return -1;
-    }
-
-    pthread_mutex_lock(&p->parent->buffer_mutex);
-    f->thread_opaque = progress = allocate_progress(p);
-
-    if (!progress) {
-        pthread_mutex_unlock(&p->parent->buffer_mutex);
-        return -1;
-    }
-
-    progress[0] =
-    progress[1] = -1;
-
-    if (avctx->thread_safe_callbacks ||
-        avctx->get_buffer == avcodec_default_get_buffer) {
-        err = avctx->get_buffer(avctx, f);
-    } else {
-        p->requested_frame = f;
-        p->state = STATE_GET_BUFFER;
-        pthread_mutex_lock(&p->progress_mutex);
-        pthread_cond_signal(&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);
-    }
-
-    pthread_mutex_unlock(&p->parent->buffer_mutex);
-
-    /*
-     * Buffer age is difficult to keep track of between
-     * multiple threads, and the optimizations it allows
-     * are not worth the effort. It is disabled for now.
-     */
-    f->age = INT_MAX;
-
-    return err;
-}
-
-void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
-{
-    PerThreadContext *p = avctx->thread_opaque;
-
-    if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
-        avctx->release_buffer(avctx, f);
-        return;
-    }
-
-    if (p->num_released_buffers >= MAX_BUFFERS) {
-        av_log(p->avctx, AV_LOG_ERROR, "too many thread_release_buffer calls!\n");
-        return;
-    }
-
-    if(avctx->debug & FF_DEBUG_BUFFERS)
-        av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p, %d buffers used\n",
-                                    f, f->owner->internal_buffer_count);
-
-    p->released_buffers[p->num_released_buffers++] = *f;
-    memset(f->data, 0, sizeof(f->data));
-}
-
 /**
  * Set the threading algorithms used.
  *
@@ -857,44 +45,44 @@ void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
  */
 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);
+    int frame_threading_supported = (avctx->codec->capabilities & AV_CODEC_CAP_FRAME_THREADS)
+                                && !(avctx->flags  & AV_CODEC_FLAG_TRUNCATED)
+                                && !(avctx->flags  & AV_CODEC_FLAG_LOW_DELAY)
+                                && !(avctx->flags2 & AV_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 {
+    } else if (avctx->codec->capabilities & AV_CODEC_CAP_SLICE_THREADS &&
+               avctx->thread_type & FF_THREAD_SLICE) {
         avctx->active_thread_type = FF_THREAD_SLICE;
+    } else if (!(avctx->codec->capabilities & AV_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 avcodec_thread_init(AVCodecContext *avctx, int thread_count)
+int ff_thread_init(AVCodecContext *avctx)
 {
-    if (avctx->thread_opaque) {
-        av_log(avctx, AV_LOG_ERROR, "avcodec_thread_init is ignored after avcodec_open\n");
-        return -1;
-    }
-
-    avctx->thread_count = FFMAX(1, thread_count);
+    validate_thread_parameters(avctx);
 
-    if (avctx->codec) {
-        validate_thread_parameters(avctx);
-
-        if (avctx->active_thread_type&FF_THREAD_SLICE)
-            return thread_init(avctx);
-        else if (avctx->active_thread_type&FF_THREAD_FRAME)
-            return frame_thread_init(avctx);
-    }
+    if (avctx->active_thread_type&FF_THREAD_SLICE)
+        return ff_slice_thread_init(avctx);
+    else if (avctx->active_thread_type&FF_THREAD_FRAME)
+        return ff_frame_thread_init(avctx);
 
     return 0;
 }
 
-void avcodec_thread_free(AVCodecContext *avctx)
+void ff_thread_free(AVCodecContext *avctx)
 {
     if (avctx->active_thread_type&FF_THREAD_FRAME)
-        frame_thread_free(avctx, avctx->thread_count);
+        ff_frame_thread_free(avctx, avctx->thread_count);
     else
-        thread_free(avctx);
+        ff_slice_thread_free(avctx);
 }