+
+/**
+ * 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 && avctx->thread_safe_callbacks)
+ 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->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;
+
+ pthread_mutex_lock(&fctx->buffer_mutex);
+ f = &p->released_buffers[--p->num_released_buffers];
+ 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;
+
+ 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;
+
+ *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) {
+ 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;
+}
+
+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 &&
+ (avctx->codec->update_thread_context || !avctx->thread_safe_callbacks)) {
+ 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);
+
+ if (!avctx->codec->update_thread_context)
+ ff_thread_finish_setup(avctx);
+ }
+
+ 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;
+ FrameThreadContext *fctx;
+
+ 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);
+
+ fctx = p->parent;
+ pthread_mutex_lock(&fctx->buffer_mutex);
+ p->released_buffers[p->num_released_buffers++] = *f;
+ pthread_mutex_unlock(&fctx->buffer_mutex);
+ memset(f->data, 0, sizeof(f->data));
+}
+
+/**
+ * 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;
+ }
+}
+
+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;
+ }
+
+ 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);
+ }
+
+ 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);
+}