mirror of https://git.ffmpeg.org/ffmpeg.git
lavc/pthread_frame: avoid leaving stale hwaccel state in worker threads
This state is not refcounted, so make sure it always has a well-defined
owner.
Remove the block added in 091341f2ab
, as
this commit also solves that issue in a more general way.
This commit is contained in:
parent
0a811f8f94
commit
cc867f2c09
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@ -148,6 +148,12 @@ typedef struct FrameThreadContext {
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* Set for the first N packets, where N is the number of threads.
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* While it is set, ff_thread_en/decode_frame won't return any results.
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*/
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/* hwaccel state is temporarily stored here in order to transfer its ownership
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* to the next decoding thread without the need for extra synchronization */
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const AVHWAccel *stash_hwaccel;
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void *stash_hwaccel_context;
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void *stash_hwaccel_priv;
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} FrameThreadContext;
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#if FF_API_THREAD_SAFE_CALLBACKS
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@ -228,9 +234,17 @@ FF_ENABLE_DEPRECATION_WARNINGS
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ff_thread_finish_setup(avctx);
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if (p->hwaccel_serializing) {
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/* wipe hwaccel state to avoid stale pointers lying around;
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* the state was transferred to FrameThreadContext in
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* ff_thread_finish_setup(), so nothing is leaked */
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avctx->hwaccel = NULL;
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avctx->hwaccel_context = NULL;
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avctx->internal->hwaccel_priv_data = NULL;
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p->hwaccel_serializing = 0;
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pthread_mutex_unlock(&p->parent->hwaccel_mutex);
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}
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av_assert0(!avctx->hwaccel);
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if (p->async_serializing) {
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p->async_serializing = 0;
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@ -294,9 +308,6 @@ static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src,
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dst->color_range = src->color_range;
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dst->chroma_sample_location = src->chroma_sample_location;
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dst->hwaccel = src->hwaccel;
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dst->hwaccel_context = src->hwaccel_context;
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dst->sample_rate = src->sample_rate;
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dst->sample_fmt = src->sample_fmt;
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#if FF_API_OLD_CHANNEL_LAYOUT
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@ -309,8 +320,6 @@ FF_ENABLE_DEPRECATION_WARNINGS
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if (err < 0)
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return err;
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dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
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if (!!dst->hw_frames_ctx != !!src->hw_frames_ctx ||
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(dst->hw_frames_ctx && dst->hw_frames_ctx->data != src->hw_frames_ctx->data)) {
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av_buffer_unref(&dst->hw_frames_ctx);
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@ -450,6 +459,12 @@ static int submit_packet(PerThreadContext *p, AVCodecContext *user_avctx,
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pthread_mutex_unlock(&p->mutex);
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return err;
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}
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/* transfer hwaccel state stashed from previous thread, if any */
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av_assert0(!p->avctx->hwaccel);
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FFSWAP(const AVHWAccel*, p->avctx->hwaccel, fctx->stash_hwaccel);
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FFSWAP(void*, p->avctx->hwaccel_context, fctx->stash_hwaccel_context);
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FFSWAP(void*, p->avctx->internal->hwaccel_priv_data, fctx->stash_hwaccel_priv);
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}
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av_packet_unref(p->avpkt);
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@ -655,6 +670,14 @@ void ff_thread_finish_setup(AVCodecContext *avctx) {
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async_lock(p->parent);
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}
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/* save hwaccel state for passing to the next thread;
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* this is done here so that this worker thread can wipe its own hwaccel
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* state after decoding, without requiring synchronization */
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av_assert0(!p->parent->stash_hwaccel);
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p->parent->stash_hwaccel = avctx->hwaccel;
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p->parent->stash_hwaccel_context = avctx->hwaccel_context;
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p->parent->stash_hwaccel_priv = avctx->internal->hwaccel_priv_data;
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pthread_mutex_lock(&p->progress_mutex);
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if(atomic_load(&p->state) == STATE_SETUP_FINISHED){
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av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
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@ -708,13 +731,6 @@ void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
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park_frame_worker_threads(fctx, thread_count);
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if (fctx->prev_thread && avctx->internal->hwaccel_priv_data !=
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fctx->prev_thread->avctx->internal->hwaccel_priv_data) {
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if (update_context_from_thread(avctx, fctx->prev_thread->avctx, 1) < 0) {
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av_log(avctx, AV_LOG_ERROR, "Failed to update user thread.\n");
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}
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}
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for (i = 0; i < thread_count; i++) {
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PerThreadContext *p = &fctx->threads[i];
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AVCodecContext *ctx = p->avctx;
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@ -761,6 +777,13 @@ void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
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av_freep(&fctx->threads);
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ff_pthread_free(fctx, thread_ctx_offsets);
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/* if we have stashed hwaccel state, move it to the user-facing context,
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* so it will be freed in avcodec_close() */
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av_assert0(!avctx->hwaccel);
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FFSWAP(const AVHWAccel*, avctx->hwaccel, fctx->stash_hwaccel);
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FFSWAP(void*, avctx->hwaccel_context, fctx->stash_hwaccel_context);
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FFSWAP(void*, avctx->internal->hwaccel_priv_data, fctx->stash_hwaccel_priv);
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av_freep(&avctx->internal->thread_ctx);
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}
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