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There were only two frames simultaneously: - one used by the decoder; - one used by the renderer. When the decoder finished decoding a frame, it swapped it with the rendering frame. Adding a third frame provides several benefits: - the decoder do not have to wait for the renderer to release the mutex; - it simplifies the video_buffer API; - it makes the rendering frame valid until the next call to video_buffer_take_rendering_frame(), which will be useful for swscaling on window resize.
69 lines
1.9 KiB
C
69 lines
1.9 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 decoder (decoding_frame)
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* - one frame is held by the renderer (rendering_frame)
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* - one frame is shared between the decoder and the renderer (pending_frame)
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*
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* The decoder decodes a packet into the decoding_frame (it may takes time).
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*
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* Once the frame is decoded, it calls video_buffer_offer_decoded_frame(),
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* which swaps the decoding and pending frames.
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*
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* When the renderer is notified that a new frame is available, it calls
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* video_buffer_take_rendering_frame() to retrieve it, which swaps the pending
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* and rendering frames. The frame is valid until the next call, without
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* blocking the decoder.
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*/
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struct video_buffer {
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AVFrame *decoding_frame;
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AVFrame *pending_frame;
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AVFrame *rendering_frame;
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sc_mutex mutex;
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bool render_expired_frames;
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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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struct fps_counter *fps_counter;
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};
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bool
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video_buffer_init(struct video_buffer *vb, struct fps_counter *fps_counter,
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bool render_expired_frames);
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void
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video_buffer_destroy(struct video_buffer *vb);
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// set the decoded frame as ready for rendering
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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_offer_decoded_frame(struct video_buffer *vb,
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bool *previous_frame_skipped);
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// mark the rendering 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_take_rendering_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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