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Video buffer is a tool between a frame producer and a frame consumer. For now, it is used between a decoder and a renderer, but in the future another instance might be used to swscale decoded frames.
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
#ifndef VIDEO_BUFFER_H
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#define VIDEO_BUFFER_H
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#include "common.h"
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#include <stdbool.h>
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#include "fps_counter.h"
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#include "util/thread.h"
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// forward declarations
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typedef struct AVFrame AVFrame;
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/**
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* There are 3 frames in memory:
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* - one frame is held by the producer (producer_frame)
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* - one frame is held by the consumer (consumer_frame)
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* - one frame is shared between the producer and the consumer (pending_frame)
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*
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* The producer generates a frame into the producer_frame (it may takes time).
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*
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* Once the frame is produced, it calls video_buffer_producer_offer_frame(),
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* which swaps the producer and pending frames.
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*
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* When the consumer is notified that a new frame is available, it calls
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* video_buffer_consumer_take_frame() to retrieve it, which swaps the pending
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* and consumer frames. The frame is valid until the next call, without
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* blocking the producer.
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*/
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struct video_buffer {
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AVFrame *producer_frame;
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AVFrame *pending_frame;
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AVFrame *consumer_frame;
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sc_mutex mutex;
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bool wait_consumer; // never overwrite a pending frame if it is not consumed
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bool interrupted;
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sc_cond pending_frame_consumed_cond;
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bool pending_frame_consumed;
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};
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bool
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video_buffer_init(struct video_buffer *vb, bool wait_consumer);
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void
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video_buffer_destroy(struct video_buffer *vb);
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// set the producer frame as ready for consuming
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// the output flag is set to report whether the previous frame has been skipped
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void
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video_buffer_producer_offer_frame(struct video_buffer *vb,
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bool *previous_frame_skipped);
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// mark the consumer frame as consumed and return it
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// the frame is valid until the next call to this function
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const AVFrame *
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video_buffer_consumer_take_frame(struct video_buffer *vb);
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// wake up and avoid any blocking call
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void
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video_buffer_interrupt(struct video_buffer *vb);
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#endif
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