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[host] initial changes to implement frame rate control

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This commit is contained in:
Geoffrey McRae
2022-11-07 19:46:18 +11:00
parent f0cb9d1167
commit 3ec632dd3c
3 changed files with 29 additions and 4 deletions
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8
host/src/app.c
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@@ -96,6 +96,7 @@ struct app
unsigned int frameIndex;
bool frameValid;
uint32_t frameSerial;
uint64_t frameTimeUs;
CaptureInterface * iface;
@@ -268,6 +269,7 @@ static bool sendFrame(void)
}
fi->formatVer = frame.formatVer;
fi->frameTimeUs = app.frameTimeUs;
fi->frameSerial = app.frameSerial++;
fi->screenWidth = frame.screenWidth;
fi->screenHeight = frame.screenHeight;
@@ -295,6 +297,11 @@ static bool sendFrame(void)
FrameBuffer * fb = (FrameBuffer *)(((uint8_t*)fi) + fi->offset);
framebuffer_prepare(fb);
// calculate the elapsed time as late as possible, note that this does not
// take into account the memory copy time and the client's that care about
// this value will need to take this into account
fi->frameElapsedUs = microtime() - app.frameTimeUs;
/* we post and then get the frame, this is intentional! */
if ((status = lgmpHostQueuePost(app.frameQueue, 0,
app.frameMemory[app.frameIndex])) != LGMP_OK)
@@ -911,6 +918,7 @@ int app_main(int argc, char * argv[])
else
previousFrameTime = now;
app.frameTimeUs = microtime();
switch(iface->capture())
{
case CAPTURE_RESULT_OK: