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pthread_frame: ensure the threads don't run simultaneously with hwaccel

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This commit is contained in:
Anton Khirnov 2016-12-03 15:21:40 +01:00
parent 373fd76b4d
commit 8dfba25ce8
3 changed files with 37 additions and 2 deletions
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2
libavcodec/h263dec.c
View File

@ -558,7 +558,7 @@ int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
return ret;
if (!s->divx_packed && !avctx->hwaccel)
if (!s->divx_packed)
ff_thread_finish_setup(avctx);
if (avctx->hwaccel) {

2
libavcodec/h264dec.c
View File

@ -573,7 +573,7 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size)
if ((err = ff_h264_queue_decode_slice(h, nal)))
break;
if (avctx->active_thread_type & FF_THREAD_FRAME && !h->avctx->hwaccel &&
if (avctx->active_thread_type & FF_THREAD_FRAME &&
i >= nals_needed && !h->setup_finished && h->cur_pic_ptr) {
ff_thread_finish_setup(avctx);
h->setup_finished = 1;

35
libavcodec/pthread_frame.c
View File

@ -99,6 +99,8 @@ typedef struct PerThreadContext {
int requested_flags; ///< flags passed to get_buffer() for requested_frame
int die; ///< Set when the thread should exit.
int hwaccel_serializing;
} PerThreadContext;
/**
@ -109,6 +111,11 @@ typedef struct FrameThreadContext {
PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
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;
int next_decoding; ///< The next context to submit a packet to.
int next_finished; ///< The next context to return output from.
@ -149,6 +156,22 @@ static attribute_align_arg void *frame_worker_thread(void *arg)
ff_thread_finish_setup(avctx);
pthread_mutex_lock(&p->mutex);
/* 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->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
@ -163,6 +186,11 @@ static attribute_align_arg void *frame_worker_thread(void *arg)
if (atomic_load(&p->state) == STATE_SETTING_UP)
ff_thread_finish_setup(avctx);
if (p->hwaccel_serializing) {
p->hwaccel_serializing = 0;
pthread_mutex_unlock(&p->parent->hwaccel_mutex);
}
atomic_store(&p->state, STATE_INPUT_READY);
pthread_mutex_lock(&p->progress_mutex);
@ -499,6 +527,11 @@ void ff_thread_finish_setup(AVCodecContext *avctx) {
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;
}
pthread_mutex_lock(&p->progress_mutex);
atomic_store(&p->state, STATE_SETUP_FINISHED);
@ -579,6 +612,7 @@ void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
av_freep(&fctx->threads);
pthread_mutex_destroy(&fctx->buffer_mutex);
pthread_mutex_destroy(&fctx->hwaccel_mutex);
av_freep(&avctx->internal->thread_ctx);
}
@ -620,6 +654,7 @@ int ff_frame_thread_init(AVCodecContext *avctx)
}
pthread_mutex_init(&fctx->buffer_mutex, NULL);
pthread_mutex_init(&fctx->hwaccel_mutex, NULL);
fctx->delaying = 1;
for (i = 0; i < thread_count; i++) {