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Diffstat (limited to '')
| -rw-r--r-- | media/ffvpx/libavcodec/pthread_frame.c | 1183 |
1 files changed, 1183 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/pthread_frame.c b/media/ffvpx/libavcodec/pthread_frame.c new file mode 100644 index 0000000000..df82a4125f --- /dev/null +++ b/media/ffvpx/libavcodec/pthread_frame.c @@ -0,0 +1,1183 @@ +/* + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Frame multithreading support functions + * @see doc/multithreading.txt + */ + +#include "config.h" + +#include <stdatomic.h> +#include <stdint.h> + +#include "avcodec.h" +#include "codec_internal.h" +#include "decode.h" +#include "hwconfig.h" +#include "internal.h" +#include "pthread_internal.h" +#include "thread.h" +#include "threadframe.h" +#include "version_major.h" + +#include "libavutil/avassert.h" +#include "libavutil/buffer.h" +#include "libavutil/common.h" +#include "libavutil/cpu.h" +#include "libavutil/frame.h" +#include "libavutil/internal.h" +#include "libavutil/log.h" +#include "libavutil/mem.h" +#include "libavutil/opt.h" +#include "libavutil/thread.h" + +enum { + ///< Set when the thread is awaiting a packet. + STATE_INPUT_READY, + ///< Set before the codec has called ff_thread_finish_setup(). + STATE_SETTING_UP, + /** + * Set when the codec calls get_buffer(). + * State is returned to STATE_SETTING_UP afterwards. + */ + STATE_GET_BUFFER, + /** + * Set when the codec calls get_format(). + * State is returned to STATE_SETTING_UP afterwards. + */ + STATE_GET_FORMAT, + ///< Set after the codec has called ff_thread_finish_setup(). + STATE_SETUP_FINISHED, +}; + +enum { + UNINITIALIZED, ///< Thread has not been created, AVCodec->close mustn't be called + NEEDS_CLOSE, ///< FFCodec->close needs to be called + INITIALIZED, ///< Thread has been properly set up +}; + +/** + * Context used by codec threads and stored in their AVCodecInternal thread_ctx. + */ +typedef struct PerThreadContext { + struct FrameThreadContext *parent; + + pthread_t thread; + int thread_init; + unsigned pthread_init_cnt;///< Number of successfully initialized mutexes/conditions + pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread. + pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change. + pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish. + + pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext. + pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond. + + AVCodecContext *avctx; ///< Context used to decode packets passed to this thread. + + AVPacket *avpkt; ///< Input packet (for decoding) or output (for encoding). + + AVFrame *frame; ///< Output frame (for decoding) or input (for encoding). + int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call. + int result; ///< The result of the last codec decode/encode() call. + + atomic_int state; + +#if FF_API_THREAD_SAFE_CALLBACKS + /** + * 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 +#endif + + int die; ///< Set when the thread should exit. + + int hwaccel_serializing; + int async_serializing; + + atomic_int debug_threads; ///< Set if the FF_DEBUG_THREADS option is set. +} PerThreadContext; + +/** + * Context stored in the client AVCodecInternal thread_ctx. + */ +typedef struct FrameThreadContext { + PerThreadContext *threads; ///< The contexts for each thread. + PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on. + + unsigned pthread_init_cnt; ///< Number of successfully initialized mutexes/conditions + pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer(). + /** + * This lock is used for ensuring threads run in serial when hwaccel + * is used. + */ + pthread_mutex_t hwaccel_mutex; + pthread_mutex_t async_mutex; + pthread_cond_t async_cond; + int async_lock; + + 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. + */ + + /* hwaccel state is temporarily stored here in order to transfer its ownership + * to the next decoding thread without the need for extra synchronization */ + const AVHWAccel *stash_hwaccel; + void *stash_hwaccel_context; + void *stash_hwaccel_priv; +} FrameThreadContext; + +#if FF_API_THREAD_SAFE_CALLBACKS +#define THREAD_SAFE_CALLBACKS(avctx) \ +((avctx)->thread_safe_callbacks || (avctx)->get_buffer2 == avcodec_default_get_buffer2) +#endif + +static void async_lock(FrameThreadContext *fctx) +{ + pthread_mutex_lock(&fctx->async_mutex); + while (fctx->async_lock) + pthread_cond_wait(&fctx->async_cond, &fctx->async_mutex); + fctx->async_lock = 1; + pthread_mutex_unlock(&fctx->async_mutex); +} + +static void async_unlock(FrameThreadContext *fctx) +{ + pthread_mutex_lock(&fctx->async_mutex); + av_assert0(fctx->async_lock); + fctx->async_lock = 0; + pthread_cond_broadcast(&fctx->async_cond); + pthread_mutex_unlock(&fctx->async_mutex); +} + +static void thread_set_name(PerThreadContext *p) +{ + AVCodecContext *avctx = p->avctx; + int idx = p - p->parent->threads; + char name[16]; + + snprintf(name, sizeof(name), "av:%.7s:df%d", avctx->codec->name, idx); + + ff_thread_setname(name); +} + +/** + * Codec worker thread. + * + * Automatically calls ff_thread_finish_setup() if the codec does + * not provide an update_thread_context method, or if the codec returns + * before calling it. + */ +static attribute_align_arg void *frame_worker_thread(void *arg) +{ + PerThreadContext *p = arg; + AVCodecContext *avctx = p->avctx; + const FFCodec *codec = ffcodec(avctx->codec); + + thread_set_name(p); + + pthread_mutex_lock(&p->mutex); + while (1) { + while (atomic_load(&p->state) == STATE_INPUT_READY && !p->die) + pthread_cond_wait(&p->input_cond, &p->mutex); + + if (p->die) break; + +FF_DISABLE_DEPRECATION_WARNINGS + if (!codec->update_thread_context +#if FF_API_THREAD_SAFE_CALLBACKS + && THREAD_SAFE_CALLBACKS(avctx) +#endif + ) + ff_thread_finish_setup(avctx); +FF_ENABLE_DEPRECATION_WARNINGS + + /* If a decoder supports hwaccel, then it must call ff_get_format(). + * Since that call must happen before ff_thread_finish_setup(), the + * decoder is required to implement update_thread_context() and call + * ff_thread_finish_setup() manually. Therefore the above + * ff_thread_finish_setup() call did not happen and hwaccel_serializing + * cannot be true here. */ + av_assert0(!p->hwaccel_serializing); + + /* if the previous thread uses hwaccel then we take the lock to ensure + * the threads don't run concurrently */ + if (avctx->hwaccel) { + pthread_mutex_lock(&p->parent->hwaccel_mutex); + p->hwaccel_serializing = 1; + } + + av_frame_unref(p->frame); + p->got_frame = 0; + p->result = codec->cb.decode(avctx, p->frame, &p->got_frame, p->avpkt); + + if ((p->result < 0 || !p->got_frame) && p->frame->buf[0]) + ff_thread_release_buffer(avctx, p->frame); + + if (atomic_load(&p->state) == STATE_SETTING_UP) + ff_thread_finish_setup(avctx); + + if (p->hwaccel_serializing) { + /* wipe hwaccel state to avoid stale pointers lying around; + * the state was transferred to FrameThreadContext in + * ff_thread_finish_setup(), so nothing is leaked */ + avctx->hwaccel = NULL; + avctx->hwaccel_context = NULL; + avctx->internal->hwaccel_priv_data = NULL; + + p->hwaccel_serializing = 0; + pthread_mutex_unlock(&p->parent->hwaccel_mutex); + } + av_assert0(!avctx->hwaccel); + + if (p->async_serializing) { + p->async_serializing = 0; + + async_unlock(p->parent); + } + + pthread_mutex_lock(&p->progress_mutex); + + atomic_store(&p->state, STATE_INPUT_READY); + + pthread_cond_broadcast(&p->progress_cond); + pthread_cond_signal(&p->output_cond); + pthread_mutex_unlock(&p->progress_mutex); + } + pthread_mutex_unlock(&p->mutex); + + return NULL; +} + +/** + * Update the next thread's AVCodecContext with values from the reference thread's context. + * + * @param dst The destination context. + * @param src The source context. + * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread + * @return 0 on success, negative error code on failure + */ +static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user) +{ + const FFCodec *const codec = ffcodec(dst->codec); + int err = 0; + + if (dst != src && (for_user || codec->update_thread_context)) { + dst->time_base = src->time_base; + dst->framerate = src->framerate; + dst->width = src->width; + dst->height = src->height; + dst->pix_fmt = src->pix_fmt; + dst->sw_pix_fmt = src->sw_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->properties = src->properties; + + dst->bits_per_coded_sample = src->bits_per_coded_sample; + dst->sample_aspect_ratio = src->sample_aspect_ratio; + + 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->sample_rate = src->sample_rate; + dst->sample_fmt = src->sample_fmt; +#if FF_API_OLD_CHANNEL_LAYOUT +FF_DISABLE_DEPRECATION_WARNINGS + dst->channels = src->channels; + dst->channel_layout = src->channel_layout; +FF_ENABLE_DEPRECATION_WARNINGS +#endif + err = av_channel_layout_copy(&dst->ch_layout, &src->ch_layout); + if (err < 0) + return err; + + if (!!dst->hw_frames_ctx != !!src->hw_frames_ctx || + (dst->hw_frames_ctx && dst->hw_frames_ctx->data != src->hw_frames_ctx->data)) { + av_buffer_unref(&dst->hw_frames_ctx); + + if (src->hw_frames_ctx) { + dst->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx); + if (!dst->hw_frames_ctx) + return AVERROR(ENOMEM); + } + } + + dst->hwaccel_flags = src->hwaccel_flags; + + err = av_buffer_replace(&dst->internal->pool, src->internal->pool); + if (err < 0) + return err; + } + + if (for_user) { + if (codec->update_thread_context_for_user) + err = codec->update_thread_context_for_user(dst, src); + } else { + if (codec->update_thread_context) + err = 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) +{ + dst->flags = src->flags; + + dst->draw_horiz_band= src->draw_horiz_band; + dst->get_buffer2 = src->get_buffer2; + + dst->opaque = src->opaque; + dst->debug = src->debug; + + dst->slice_flags = src->slice_flags; + dst->flags2 = src->flags2; + dst->export_side_data = src->export_side_data; + + dst->skip_loop_filter = src->skip_loop_filter; + dst->skip_idct = src->skip_idct; + dst->skip_frame = src->skip_frame; + + dst->frame_number = src->frame_number; + dst->reordered_opaque = src->reordered_opaque; +#if FF_API_THREAD_SAFE_CALLBACKS +FF_DISABLE_DEPRECATION_WARNINGS + dst->thread_safe_callbacks = src->thread_safe_callbacks; +FF_ENABLE_DEPRECATION_WARNINGS +#endif + + if (src->slice_count && src->slice_offset) { + if (dst->slice_count < src->slice_count) { + int err = av_reallocp_array(&dst->slice_offset, src->slice_count, + sizeof(*dst->slice_offset)); + if (err < 0) + return err; + } + memcpy(dst->slice_offset, src->slice_offset, + src->slice_count * sizeof(*dst->slice_offset)); + } + dst->slice_count = src->slice_count; + return 0; +} + +#if FF_API_THREAD_SAFE_CALLBACKS +/// 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); + } +} +#endif + +static int submit_packet(PerThreadContext *p, AVCodecContext *user_avctx, + AVPacket *avpkt) +{ + FrameThreadContext *fctx = p->parent; + PerThreadContext *prev_thread = fctx->prev_thread; + const AVCodec *codec = p->avctx->codec; + int ret; + + if (!avpkt->size && !(codec->capabilities & AV_CODEC_CAP_DELAY)) + return 0; + + pthread_mutex_lock(&p->mutex); + + ret = update_context_from_user(p->avctx, user_avctx); + if (ret) { + pthread_mutex_unlock(&p->mutex); + return ret; + } + atomic_store_explicit(&p->debug_threads, + (p->avctx->debug & FF_DEBUG_THREADS) != 0, + memory_order_relaxed); + +#if FF_API_THREAD_SAFE_CALLBACKS + release_delayed_buffers(p); +#endif + + if (prev_thread) { + int err; + if (atomic_load(&prev_thread->state) == STATE_SETTING_UP) { + pthread_mutex_lock(&prev_thread->progress_mutex); + while (atomic_load(&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; + } + } + + /* transfer the stashed hwaccel state, if any */ + av_assert0(!p->avctx->hwaccel); + FFSWAP(const AVHWAccel*, p->avctx->hwaccel, fctx->stash_hwaccel); + FFSWAP(void*, p->avctx->hwaccel_context, fctx->stash_hwaccel_context); + FFSWAP(void*, p->avctx->internal->hwaccel_priv_data, fctx->stash_hwaccel_priv); + + av_packet_unref(p->avpkt); + ret = av_packet_ref(p->avpkt, avpkt); + if (ret < 0) { + pthread_mutex_unlock(&p->mutex); + av_log(p->avctx, AV_LOG_ERROR, "av_packet_ref() failed in submit_packet()\n"); + return ret; + } + + atomic_store(&p->state, STATE_SETTING_UP); + pthread_cond_signal(&p->input_cond); + pthread_mutex_unlock(&p->mutex); + +#if FF_API_THREAD_SAFE_CALLBACKS +FF_DISABLE_DEPRECATION_WARNINGS + /* + * If the client doesn't have a thread-safe get_buffer(), + * then decoding threads call back to the main thread, + * and it calls back to the client here. + */ + + if (!p->avctx->thread_safe_callbacks && ( + p->avctx->get_format != avcodec_default_get_format || + p->avctx->get_buffer2 != avcodec_default_get_buffer2)) { + while (atomic_load(&p->state) != STATE_SETUP_FINISHED && atomic_load(&p->state) != STATE_INPUT_READY) { + int call_done = 1; + pthread_mutex_lock(&p->progress_mutex); + while (atomic_load(&p->state) == STATE_SETTING_UP) + pthread_cond_wait(&p->progress_cond, &p->progress_mutex); + + switch (atomic_load_explicit(&p->state, memory_order_acquire)) { + case STATE_GET_BUFFER: + p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags); + break; + case STATE_GET_FORMAT: + p->result_format = ff_get_format(p->avctx, p->available_formats); + break; + default: + call_done = 0; + break; + } + if (call_done) { + atomic_store(&p->state, STATE_SETTING_UP); + pthread_cond_signal(&p->progress_cond); + } + pthread_mutex_unlock(&p->progress_mutex); + } + } +FF_ENABLE_DEPRECATION_WARNINGS +#endif + + fctx->prev_thread = p; + fctx->next_decoding++; + + return 0; +} + +int ff_thread_decode_frame(AVCodecContext *avctx, + AVFrame *picture, int *got_picture_ptr, + AVPacket *avpkt) +{ + FrameThreadContext *fctx = avctx->internal->thread_ctx; + int finished = fctx->next_finished; + PerThreadContext *p; + int err; + + /* release the async lock, permitting blocked hwaccel threads to + * go forward while we are in this function */ + async_unlock(fctx); + + /* + * Submit a packet to the next decoding thread. + */ + + p = &fctx->threads[fctx->next_decoding]; + err = submit_packet(p, avctx, avpkt); + if (err) + goto finish; + + /* + * 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) { + err = avpkt->size; + goto finish; + } + } + + /* + * 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/error, because we don't want to accidentally signal + * EOF (avpkt->size == 0 && *got_picture_ptr == 0 && err >= 0). + */ + + do { + p = &fctx->threads[finished++]; + + if (atomic_load(&p->state) != STATE_INPUT_READY) { + pthread_mutex_lock(&p->progress_mutex); + while (atomic_load_explicit(&p->state, memory_order_relaxed) != 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; + err = p->result; + + /* + * A later call with avkpt->size == 0 may loop over all threads, + * including this one, searching for a frame/error to return before being + * stopped by the "finished != fctx->next_finished" condition. + * Make sure we don't mistakenly return the same frame/error again. + */ + p->got_frame = 0; + p->result = 0; + + if (finished >= avctx->thread_count) finished = 0; + } while (!avpkt->size && !*got_picture_ptr && err >= 0 && 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 */ + if (err >= 0) + err = avpkt->size; +finish: + async_lock(fctx); + return err; +} + +void ff_thread_report_progress(ThreadFrame *f, int n, int field) +{ + PerThreadContext *p; + atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL; + + if (!progress || + atomic_load_explicit(&progress[field], memory_order_relaxed) >= n) + return; + + p = f->owner[field]->internal->thread_ctx; + + if (atomic_load_explicit(&p->debug_threads, memory_order_relaxed)) + av_log(f->owner[field], AV_LOG_DEBUG, + "%p finished %d field %d\n", progress, n, field); + + pthread_mutex_lock(&p->progress_mutex); + + atomic_store_explicit(&progress[field], n, memory_order_release); + + pthread_cond_broadcast(&p->progress_cond); + pthread_mutex_unlock(&p->progress_mutex); +} + +void ff_thread_await_progress(const ThreadFrame *f, int n, int field) +{ + PerThreadContext *p; + atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL; + + if (!progress || + atomic_load_explicit(&progress[field], memory_order_acquire) >= n) + return; + + p = f->owner[field]->internal->thread_ctx; + + if (atomic_load_explicit(&p->debug_threads, memory_order_relaxed)) + av_log(f->owner[field], AV_LOG_DEBUG, + "thread awaiting %d field %d from %p\n", n, field, progress); + + pthread_mutex_lock(&p->progress_mutex); + while (atomic_load_explicit(&progress[field], memory_order_relaxed) < n) + pthread_cond_wait(&p->progress_cond, &p->progress_mutex); + pthread_mutex_unlock(&p->progress_mutex); +} + +void ff_thread_finish_setup(AVCodecContext *avctx) { + PerThreadContext *p = avctx->internal->thread_ctx; + + if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return; + + if (avctx->hwaccel && !p->hwaccel_serializing) { + pthread_mutex_lock(&p->parent->hwaccel_mutex); + p->hwaccel_serializing = 1; + } + + /* this assumes that no hwaccel calls happen before ff_thread_finish_setup() */ + if (avctx->hwaccel && + !(avctx->hwaccel->caps_internal & HWACCEL_CAP_ASYNC_SAFE)) { + p->async_serializing = 1; + + async_lock(p->parent); + } + + /* save hwaccel state for passing to the next thread; + * this is done here so that this worker thread can wipe its own hwaccel + * state after decoding, without requiring synchronization */ + av_assert0(!p->parent->stash_hwaccel); + p->parent->stash_hwaccel = avctx->hwaccel; + p->parent->stash_hwaccel_context = avctx->hwaccel_context; + p->parent->stash_hwaccel_priv = avctx->internal->hwaccel_priv_data; + + pthread_mutex_lock(&p->progress_mutex); + if(atomic_load(&p->state) == STATE_SETUP_FINISHED){ + av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n"); + } + + atomic_store(&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; + + async_unlock(fctx); + + for (i = 0; i < thread_count; i++) { + PerThreadContext *p = &fctx->threads[i]; + + if (atomic_load(&p->state) != STATE_INPUT_READY) { + pthread_mutex_lock(&p->progress_mutex); + while (atomic_load(&p->state) != STATE_INPUT_READY) + pthread_cond_wait(&p->output_cond, &p->progress_mutex); + pthread_mutex_unlock(&p->progress_mutex); + } + p->got_frame = 0; + } + + async_lock(fctx); +} + +#define OFF(member) offsetof(FrameThreadContext, member) +DEFINE_OFFSET_ARRAY(FrameThreadContext, thread_ctx, pthread_init_cnt, + (OFF(buffer_mutex), OFF(hwaccel_mutex), OFF(async_mutex)), + (OFF(async_cond))); +#undef OFF + +#define OFF(member) offsetof(PerThreadContext, member) +DEFINE_OFFSET_ARRAY(PerThreadContext, per_thread, pthread_init_cnt, + (OFF(progress_mutex), OFF(mutex)), + (OFF(input_cond), OFF(progress_cond), OFF(output_cond))); +#undef OFF + +void ff_frame_thread_free(AVCodecContext *avctx, int thread_count) +{ + FrameThreadContext *fctx = avctx->internal->thread_ctx; + const FFCodec *codec = ffcodec(avctx->codec); + int i; + + park_frame_worker_threads(fctx, thread_count); + + for (i = 0; i < thread_count; i++) { + PerThreadContext *p = &fctx->threads[i]; + AVCodecContext *ctx = p->avctx; + + if (ctx->internal) { + if (p->thread_init == INITIALIZED) { + pthread_mutex_lock(&p->mutex); + p->die = 1; + pthread_cond_signal(&p->input_cond); + pthread_mutex_unlock(&p->mutex); + + pthread_join(p->thread, NULL); + } + if (codec->close && p->thread_init != UNINITIALIZED) + codec->close(ctx); + +#if FF_API_THREAD_SAFE_CALLBACKS + release_delayed_buffers(p); + for (int j = 0; j < p->released_buffers_allocated; j++) + av_frame_free(&p->released_buffers[j]); + av_freep(&p->released_buffers); +#endif + if (ctx->priv_data) { + if (codec->p.priv_class) + av_opt_free(ctx->priv_data); + av_freep(&ctx->priv_data); + } + + av_freep(&ctx->slice_offset); + + av_buffer_unref(&ctx->internal->pool); + av_freep(&ctx->internal); + av_buffer_unref(&ctx->hw_frames_ctx); + } + + av_frame_free(&p->frame); + + ff_pthread_free(p, per_thread_offsets); + av_packet_free(&p->avpkt); + + av_freep(&p->avctx); + } + + av_freep(&fctx->threads); + ff_pthread_free(fctx, thread_ctx_offsets); + + /* if we have stashed hwaccel state, move it to the user-facing context, + * so it will be freed in avcodec_close() */ + av_assert0(!avctx->hwaccel); + FFSWAP(const AVHWAccel*, avctx->hwaccel, fctx->stash_hwaccel); + FFSWAP(void*, avctx->hwaccel_context, fctx->stash_hwaccel_context); + FFSWAP(void*, avctx->internal->hwaccel_priv_data, fctx->stash_hwaccel_priv); + + av_freep(&avctx->internal->thread_ctx); +} + +static av_cold int init_thread(PerThreadContext *p, int *threads_to_free, + FrameThreadContext *fctx, AVCodecContext *avctx, + const FFCodec *codec, int first) +{ + AVCodecContext *copy; + int err; + + atomic_init(&p->state, STATE_INPUT_READY); + + copy = av_memdup(avctx, sizeof(*avctx)); + if (!copy) + return AVERROR(ENOMEM); + copy->priv_data = NULL; + + /* From now on, this PerThreadContext will be cleaned up by + * ff_frame_thread_free in case of errors. */ + (*threads_to_free)++; + + p->parent = fctx; + p->avctx = copy; + + copy->internal = av_mallocz(sizeof(*copy->internal)); + if (!copy->internal) + return AVERROR(ENOMEM); + copy->internal->thread_ctx = p; + + copy->delay = avctx->delay; + + if (codec->priv_data_size) { + copy->priv_data = av_mallocz(codec->priv_data_size); + if (!copy->priv_data) + return AVERROR(ENOMEM); + + if (codec->p.priv_class) { + *(const AVClass **)copy->priv_data = codec->p.priv_class; + err = av_opt_copy(copy->priv_data, avctx->priv_data); + if (err < 0) + return err; + } + } + + err = ff_pthread_init(p, per_thread_offsets); + if (err < 0) + return err; + + if (!(p->frame = av_frame_alloc()) || + !(p->avpkt = av_packet_alloc())) + return AVERROR(ENOMEM); + copy->internal->last_pkt_props = p->avpkt; + + if (!first) + copy->internal->is_copy = 1; + + if (codec->init) { + err = codec->init(copy); + if (err < 0) { + if (codec->caps_internal & FF_CODEC_CAP_INIT_CLEANUP) + p->thread_init = NEEDS_CLOSE; + return err; + } + } + p->thread_init = NEEDS_CLOSE; + + if (first) + update_context_from_thread(avctx, copy, 1); + + atomic_init(&p->debug_threads, (copy->debug & FF_DEBUG_THREADS) != 0); + + err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p)); + if (err < 0) + return err; + p->thread_init = INITIALIZED; + + return 0; +} + +int ff_frame_thread_init(AVCodecContext *avctx) +{ + int thread_count = avctx->thread_count; + const FFCodec *codec = ffcodec(avctx->codec); + FrameThreadContext *fctx; + int err, i = 0; + + if (!thread_count) { + int nb_cpus = av_cpu_count(); + // use number of cores + 1 as thread count if there is more than one + if (nb_cpus > 1) + thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS); + else + thread_count = avctx->thread_count = 1; + } + + if (thread_count <= 1) { + avctx->active_thread_type = 0; + return 0; + } + + avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext)); + if (!fctx) + return AVERROR(ENOMEM); + + err = ff_pthread_init(fctx, thread_ctx_offsets); + if (err < 0) { + ff_pthread_free(fctx, thread_ctx_offsets); + av_freep(&avctx->internal->thread_ctx); + return err; + } + + fctx->async_lock = 1; + fctx->delaying = 1; + + if (codec->p.type == AVMEDIA_TYPE_VIDEO) + avctx->delay = avctx->thread_count - 1; + + fctx->threads = av_calloc(thread_count, sizeof(*fctx->threads)); + if (!fctx->threads) { + err = AVERROR(ENOMEM); + goto error; + } + + for (; i < thread_count; ) { + PerThreadContext *p = &fctx->threads[i]; + int first = !i; + + err = init_thread(p, &i, fctx, avctx, codec, first); + if (err < 0) + goto error; + } + + return 0; + +error: + ff_frame_thread_free(avctx, i); + return err; +} + +void ff_thread_flush(AVCodecContext *avctx) +{ + int i; + FrameThreadContext *fctx = avctx->internal->thread_ctx; + + if (!fctx) return; + + park_frame_worker_threads(fctx, avctx->thread_count); + if (fctx->prev_thread) { + if (fctx->prev_thread != &fctx->threads[0]) + update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0); + } + + fctx->next_decoding = fctx->next_finished = 0; + fctx->delaying = 1; + fctx->prev_thread = NULL; + for (i = 0; i < avctx->thread_count; i++) { + PerThreadContext *p = &fctx->threads[i]; + // Make sure decode flush calls with size=0 won't return old frames + p->got_frame = 0; + av_frame_unref(p->frame); + p->result = 0; + +#if FF_API_THREAD_SAFE_CALLBACKS + release_delayed_buffers(p); +#endif + + if (ffcodec(avctx->codec)->flush) + ffcodec(avctx->codec)->flush(p->avctx); + } +} + +int ff_thread_can_start_frame(AVCodecContext *avctx) +{ + PerThreadContext *p = avctx->internal->thread_ctx; +FF_DISABLE_DEPRECATION_WARNINGS + if ((avctx->active_thread_type&FF_THREAD_FRAME) && atomic_load(&p->state) != STATE_SETTING_UP && + (ffcodec(avctx->codec)->update_thread_context +#if FF_API_THREAD_SAFE_CALLBACKS + || !THREAD_SAFE_CALLBACKS(avctx) +#endif + )) { + return 0; + } +FF_ENABLE_DEPRECATION_WARNINGS + return 1; +} + +static int thread_get_buffer_internal(AVCodecContext *avctx, AVFrame *f, int flags) +{ + PerThreadContext *p; + int err; + + if (!(avctx->active_thread_type & FF_THREAD_FRAME)) + return ff_get_buffer(avctx, f, flags); + + p = avctx->internal->thread_ctx; +FF_DISABLE_DEPRECATION_WARNINGS + if (atomic_load(&p->state) != STATE_SETTING_UP && + (ffcodec(avctx->codec)->update_thread_context +#if FF_API_THREAD_SAFE_CALLBACKS + || !THREAD_SAFE_CALLBACKS(avctx) +#endif + )) { +FF_ENABLE_DEPRECATION_WARNINGS + 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); +#if !FF_API_THREAD_SAFE_CALLBACKS + err = ff_get_buffer(avctx, f, flags); +#else +FF_DISABLE_DEPRECATION_WARNINGS + if (THREAD_SAFE_CALLBACKS(avctx)) { + err = ff_get_buffer(avctx, f, flags); + } else { + pthread_mutex_lock(&p->progress_mutex); + p->requested_frame = f; + p->requested_flags = flags; + atomic_store_explicit(&p->state, STATE_GET_BUFFER, memory_order_release); + pthread_cond_broadcast(&p->progress_cond); + + while (atomic_load(&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) && !ffcodec(avctx->codec)->update_thread_context) + ff_thread_finish_setup(avctx); +FF_ENABLE_DEPRECATION_WARNINGS +#endif + + pthread_mutex_unlock(&p->parent->buffer_mutex); + + return err; +} + +#if FF_API_THREAD_SAFE_CALLBACKS +FF_DISABLE_DEPRECATION_WARNINGS +enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt) +{ + enum AVPixelFormat res; + PerThreadContext *p; + if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks || + avctx->get_format == avcodec_default_get_format) + return ff_get_format(avctx, fmt); + + p = avctx->internal->thread_ctx; + if (atomic_load(&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; + atomic_store(&p->state, STATE_GET_FORMAT); + pthread_cond_broadcast(&p->progress_cond); + + while (atomic_load(&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; +} +FF_ENABLE_DEPRECATION_WARNINGS +#endif + +int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *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; +} + +int ff_thread_get_ext_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags) +{ + int ret; + + f->owner[0] = f->owner[1] = avctx; + /* Hint: It is possible for this function to be called with codecs + * that don't support frame threading at all, namely in case + * a frame-threaded decoder shares code with codecs that are not. + * This currently affects non-MPEG-4 mpegvideo codecs and and VP7. + * The following check will always be true for them. */ + if (!(avctx->active_thread_type & FF_THREAD_FRAME)) + return ff_get_buffer(avctx, f->f, flags); + + if (ffcodec(avctx->codec)->caps_internal & FF_CODEC_CAP_ALLOCATE_PROGRESS) { + atomic_int *progress; + f->progress = av_buffer_alloc(2 * sizeof(*progress)); + if (!f->progress) { + return AVERROR(ENOMEM); + } + progress = (atomic_int*)f->progress->data; + + atomic_init(&progress[0], -1); + atomic_init(&progress[1], -1); + } + + ret = ff_thread_get_buffer(avctx, f->f, flags); + if (ret) + av_buffer_unref(&f->progress); + return ret; +} + +void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f) +{ +#if FF_API_THREAD_SAFE_CALLBACKS +FF_DISABLE_DEPRECATION_WARNINGS + PerThreadContext *p; + FrameThreadContext *fctx; + AVFrame *dst; + int ret = 0; + int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) || + THREAD_SAFE_CALLBACKS(avctx); +FF_ENABLE_DEPRECATION_WARNINGS +#endif + + if (!f) + return; + + if (avctx->debug & FF_DEBUG_BUFFERS) + av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f); + +#if !FF_API_THREAD_SAFE_CALLBACKS + av_frame_unref(f); +#else + // when the frame buffers are not allocated, just reset it to clean state + if (can_direct_free || !f->buf[0]) { + av_frame_unref(f); + return; + } + + p = avctx->internal->thread_ctx; + fctx = p->parent; + pthread_mutex_lock(&fctx->buffer_mutex); + + if (p->num_released_buffers == p->released_buffers_allocated) { + AVFrame **tmp = av_realloc_array(p->released_buffers, p->released_buffers_allocated + 1, + sizeof(*p->released_buffers)); + if (tmp) { + tmp[p->released_buffers_allocated] = av_frame_alloc(); + p->released_buffers = tmp; + } + + if (!tmp || !tmp[p->released_buffers_allocated]) { + ret = AVERROR(ENOMEM); + goto fail; + } + p->released_buffers_allocated++; + } + + dst = p->released_buffers[p->num_released_buffers]; + av_frame_move_ref(dst, f); + + p->num_released_buffers++; + +fail: + pthread_mutex_unlock(&fctx->buffer_mutex); + + // make sure the frame is clean even if we fail to free it + // this leaks, but it is better than crashing + if (ret < 0) { + av_log(avctx, AV_LOG_ERROR, "Could not queue a frame for freeing, this will leak\n"); + memset(f->buf, 0, sizeof(f->buf)); + if (f->extended_buf) + memset(f->extended_buf, 0, f->nb_extended_buf * sizeof(*f->extended_buf)); + av_frame_unref(f); + } +#endif +} + +void ff_thread_release_ext_buffer(AVCodecContext *avctx, ThreadFrame *f) +{ + av_buffer_unref(&f->progress); + f->owner[0] = f->owner[1] = NULL; + ff_thread_release_buffer(avctx, f->f); +} |