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Implement buffering

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To minimize latency (at the cost of jitter), scrcpy always displays a
frame as soon as it available, without waiting.

However, when recording (--record), it still writes the captured
timestamps to the output file, so that the recorded file can be played
correctly without jitter.

Some real-time use cases might benefit from adding a small latency to
compensate for jitter too. For example, few tens of seconds of latency
for live-streaming are not important, but jitter is noticeable.

Therefore, implement a buffering mechanism (disabled by default) to add
a configurable latency delay.

PR #2417 <https://github.com/Genymobile/scrcpy/issues/2417>
This commit is contained in:
Romain Vimont
2021-07-04 15:24:51 +02:00
parent 408a301201
commit 79278961b9
7 changed files with 439 additions and 22 deletions
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36
app/src/video_buffer.h
View File

@@ -5,14 +5,39 @@
#include <stdbool.h>
#include "clock.h"
#include "frame_buffer.h"
#include "util/queue.h"
#include "util/thread.h"
#include "util/tick.h"
// forward declarations
typedef struct AVFrame AVFrame;
struct sc_video_buffer_frame {
AVFrame *frame;
struct sc_video_buffer_frame *next;
};
struct sc_video_buffer_frame_queue SC_QUEUE(struct sc_video_buffer_frame);
struct sc_video_buffer {
struct sc_frame_buffer fb;
sc_tick buffering_time;
// only if buffering_time > 0
struct {
sc_thread thread;
sc_mutex mutex;
sc_cond queue_cond;
sc_cond wait_cond;
struct sc_clock clock;
struct sc_video_buffer_frame_queue queue;
bool stopped;
} b; // buffering
const struct sc_video_buffer_callbacks *cbs;
void *cbs_userdata;
};
@@ -23,10 +48,19 @@ struct sc_video_buffer_callbacks {
};
bool
sc_video_buffer_init(struct sc_video_buffer *vb,
sc_video_buffer_init(struct sc_video_buffer *vb, sc_tick buffering_time,
const struct sc_video_buffer_callbacks *cbs,
void *cbs_userdata);
bool
sc_video_buffer_start(struct sc_video_buffer *vb);
void
sc_video_buffer_stop(struct sc_video_buffer *vb);
void
sc_video_buffer_join(struct sc_video_buffer *vb);
void
sc_video_buffer_destroy(struct sc_video_buffer *vb);