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107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
#include "frames.h"
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#include <SDL2/SDL_assert.h>
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#include <SDL2/SDL_log.h>
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#include <SDL2/SDL_mutex.h>
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#include <libavutil/avutil.h>
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#include <libavformat/avformat.h>
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#include "config.h"
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#include "lockutil.h"
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SDL_bool frames_init(struct frames *frames) {
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if (!(frames->decoding_frame = av_frame_alloc())) {
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goto error_0;
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}
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if (!(frames->rendering_frame = av_frame_alloc())) {
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goto error_1;
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}
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if (!(frames->mutex = SDL_CreateMutex())) {
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goto error_2;
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}
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#ifndef SKIP_FRAMES
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if (!(frames->rendering_frame_consumed_cond = SDL_CreateCond())) {
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SDL_DestroyMutex(frames->mutex);
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goto error_2;
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}
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frames->stopped = SDL_FALSE;
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#endif
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// there is initially no rendering frame, so consider it has already been
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// consumed
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frames->rendering_frame_consumed = SDL_TRUE;
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return SDL_TRUE;
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error_2:
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av_frame_free(&frames->rendering_frame);
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error_1:
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av_frame_free(&frames->decoding_frame);
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error_0:
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return SDL_FALSE;
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}
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void frames_destroy(struct frames *frames) {
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#ifndef SKIP_FRAMES
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SDL_DestroyCond(frames->rendering_frame_consumed_cond);
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#endif
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SDL_DestroyMutex(frames->mutex);
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av_frame_free(&frames->rendering_frame);
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av_frame_free(&frames->decoding_frame);
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}
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static void frames_swap(struct frames *frames) {
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AVFrame *tmp = frames->decoding_frame;
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frames->decoding_frame = frames->rendering_frame;
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frames->rendering_frame = tmp;
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}
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SDL_bool frames_offer_decoded_frame(struct frames *frames) {
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mutex_lock(frames->mutex);
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#ifndef SKIP_FRAMES
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// if SKIP_FRAMES is disabled, then the decoder must wait for the current
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// frame to be consumed
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while (!frames->rendering_frame_consumed && !frames->stopped) {
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cond_wait(frames->rendering_frame_consumed_cond, frames->mutex);
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}
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#else
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if (!frames->rendering_frame_consumed) {
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SDL_LogDebug(SDL_LOG_CATEGORY_RENDER, "Skip frame");
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}
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#endif
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frames_swap(frames);
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SDL_bool previous_frame_consumed = frames->rendering_frame_consumed;
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frames->rendering_frame_consumed = SDL_FALSE;
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mutex_unlock(frames->mutex);
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return previous_frame_consumed;
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}
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const AVFrame *frames_consume_rendered_frame(struct frames *frames) {
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SDL_assert(!frames->rendering_frame_consumed);
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frames->rendering_frame_consumed = SDL_TRUE;
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#ifndef SKIP_FRAMES
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// if SKIP_FRAMES is disabled, then notify the decoder the current frame is
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// consumed, so that it may push a new one
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cond_signal(frames->rendering_frame_consumed_cond);
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#endif
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return frames->rendering_frame;
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}
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void frames_stop(struct frames *frames) {
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#ifdef SKIP_FRAMES
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(void) frames; // unused
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#else
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mutex_lock(frames->mutex);
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frames->stopped = SDL_TRUE;
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mutex_unlock(frames->mutex);
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// wake up blocking wait
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cond_signal(frames->rendering_frame_consumed_cond);
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#endif
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}
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