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v4p: dma support

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This commit is contained in:
Maxim Devaev
2024-03-08 23:43:24 +00:00
parent e1ef86146f
commit 897ad4951b
5 changed files with 372 additions and 329 deletions
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81
src/v4p/main.c
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@@ -164,61 +164,102 @@ static void _main_loop(void) {
us_device_s *dev = us_device_init();
dev->path = "/dev/kvmd-video";
dev->n_bufs = drm->n_bufs;
dev->n_bufs = 6;
dev->format = V4L2_PIX_FMT_RGB24;
dev->dv_timings = true;
dev->persistent = true;
dev->dma_export = true;
dev->dma_required = true;
int once = 0;
int drm_opened = -1;
while (!atomic_load(&_g_stop)) {
if (atomic_load(&_g_ustreamer_online)) {
if (us_drm_wait_for_vsync(drm) == 0) {
us_drm_expose(drm, US_DRM_EXPOSE_BUSY, NULL, 0);
}
if (dev->run->fd >= 0) {
if (drm_opened <= 0) {
if ((drm_opened = us_drm_open(drm, NULL)) < 0) {
goto close;
} else {
_slowdown();
continue;
}
}
assert(drm_opened > 0);
if (atomic_load(&_g_ustreamer_online)) {
US_ONCE({ US_LOG_INFO("DRM: Online stream is active"); });
if (us_drm_wait_for_vsync(drm) < 0) {
goto close;
}
if (us_drm_expose_stub(drm, US_DRM_STUB_BUSY, NULL) < 0) {
goto close;
}
_slowdown();
continue;
}
if (us_device_open(dev) < 0) {
if (us_drm_wait_for_vsync(drm) == 0) {
us_drm_expose(drm, US_DRM_EXPOSE_NO_SIGNAL, NULL, 0);
if (us_drm_wait_for_vsync(drm) < 0) {
goto close;
}
if (us_drm_expose_stub(drm, US_DRM_STUB_NO_SIGNAL, NULL) < 0) {
goto close;
}
_slowdown();
continue;
}
us_drm_close(drm);
if ((drm_opened = us_drm_open(drm, dev)) < 0) {
goto close;
}
once = 0;
us_hw_buffer_s *prev_hw = NULL;
while (!atomic_load(&_g_stop)) {
if (atomic_load(&_g_ustreamer_online)) {
goto close;
}
if (us_drm_wait_for_vsync(drm) < 0) {
_slowdown();
continue;
goto close;
}
if (prev_hw != NULL) {
if (us_device_release_buffer(dev, prev_hw) < 0) {
goto close;
}
prev_hw = NULL;
}
us_hw_buffer_s *hw;
const int buf_index = us_device_grab_buffer(dev, &hw);
switch (buf_index) {
const int n_buf = us_device_grab_buffer(dev, &hw);
switch (n_buf) {
case -2: continue; // Broken frame
case -1: goto close; // Any error
}
assert(buf_index >= 0);
assert(n_buf >= 0);
const int exposed = us_drm_expose(drm, US_DRM_EXPOSE_FRAME, &hw->raw, dev->run->hz);
if (us_device_release_buffer(dev, hw) < 0) {
goto close;
int exposed;
if (drm_opened == 0) {
exposed = us_drm_expose_dma(drm, hw);
prev_hw = hw;
} else {
exposed = us_drm_expose_stub(drm, drm_opened, dev);
if (us_device_release_buffer(dev, hw) < 0) {
goto close;
}
}
if (exposed < 0) {
goto close;
} else if (drm_opened > 0) {
_slowdown();
continue;
}
}
close:
us_drm_close(drm);
drm_opened = -1;
us_device_close(dev);
_slowdown();
}