cb9c42bdcb
A skipped frame is detected when the producer offers a frame while the current pending frame has not been consumed. However, the producer (in practice the decoder) is not interested in the fact that a frame has been skipped, only the consumer (the renderer) is. Therefore, notify frame skip via a consumer callback. This allows to manage the skipped and rendered frames count at the same place, and remove fps_counter from decoder.
82 lines
2.4 KiB
C
82 lines
2.4 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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const struct video_buffer_callbacks *cbs;
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void *cbs_userdata;
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};
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struct video_buffer_callbacks {
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// Called when a new frame can be consumed by
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// video_buffer_consumer_take_frame(vb)
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// This callback is mandatory (it must not be NULL).
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void (*on_frame_available)(struct video_buffer *vb, void *userdata);
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// Called when a pending frame has been overwritten by the producer
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// This callback is optional (it may be NULL).
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void (*on_frame_skipped)(struct video_buffer *vb, void *userdata);
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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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void
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video_buffer_set_consumer_callbacks(struct video_buffer *vb,
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const struct video_buffer_callbacks *cbs,
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void *cbs_userdata);
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// set the producer frame as ready for consuming
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void
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video_buffer_producer_offer_frame(struct video_buffer *vb);
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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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