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video src now picks the best <=1080p mode

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Green Sky 2024-10-03 16:42:07 +02:00
parent 14a726ad75
commit 09c8bbfcc6
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1 changed files with 49 additions and 30 deletions
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79
src/frame_streams/sdl/sdl_video_frame_stream2.cpp
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@ -46,7 +46,6 @@ std::shared_ptr<FrameStream2I<SDLVideoFrame>> SDLVideo2InputDevice::subscribe(vo
int devcount {0};
SDL_CameraID *devices = SDL_GetCameras(&devcount);
//std::cout << "SDL Camera Driver: " << SDL_GetCurrentCameraDriver() << "\n";
if (devices == nullptr || devcount < 1) {
_ref--;
@ -55,47 +54,67 @@ std::shared_ptr<FrameStream2I<SDLVideoFrame>> SDLVideo2InputDevice::subscribe(vo
return nullptr;
}
// TODO: relist on device open?
//std::cout << "### found cameras:\n";
//for (int i = 0; i < devcount; i++) {
// const SDL_CameraID device = devices[i];
// const char *name = SDL_GetCameraName(device);
// std::cout << " - Camera #" << i << ": " << name << "\n";
// int speccount {0};
// SDL_CameraSpec** specs = SDL_GetCameraSupportedFormats(device, &speccount);
// if (specs == nullptr) {
// std::cout << " - no supported spec\n";
// } else {
// for (int spec_i = 0; spec_i < speccount; spec_i++) {
// std::cout << " - " << specs[spec_i]->width << "x" << specs[spec_i]->height << "@" << float(specs[spec_i]->framerate_numerator)/specs[spec_i]->framerate_denominator << "fps " << SDL_GetPixelFormatName(specs[spec_i]->format) << "\n";
// }
// SDL_free(specs);
// }
//}
std::unique_ptr<SDL_Camera, decltype(&SDL_CloseCamera)> camera {nullptr, &SDL_CloseCamera};
auto device = devices[0];
//auto device = devices[devcount-1];
SDL_CameraSpec spec {
// FORCE a different pixel format
//SDL_PIXELFORMAT_UNKNOWN,
SDL_PIXELFORMAT_YUY2,
//SDL_COLORSPACE_UNKNOWN,
SDL_COLORSPACE_YUV_DEFAULT,
SDL_PIXELFORMAT_UNKNOWN,
//SDL_PIXELFORMAT_YUY2,
SDL_COLORSPACE_UNKNOWN,
//SDL_COLORSPACE_YUV_DEFAULT,
1280, 720,
30, 1
60, 1
};
// choose a good spec, large res but <= 1080p
int speccount {0};
SDL_CameraSpec** specs = SDL_GetCameraSupportedFormats(device, &speccount);
if (specs != nullptr) {
spec = *specs[0];
for (int spec_i = 1; spec_i < speccount; spec_i++) {
if (specs[spec_i]->height > 1080) {
continue;
}
if (spec.height > specs[spec_i]->height) {
continue;
}
if (
float(spec.framerate_numerator)/float(spec.framerate_denominator)
>
float(specs[spec_i]->framerate_numerator)/float(specs[spec_i]->framerate_denominator)
) {
continue;
}
if (spec.format == SDL_PIXELFORMAT_NV12 && specs[spec_i]->format == SDL_PIXELFORMAT_YUY2) {
// HACK: prefer nv12 over yuy2
continue;
}
// seems to be better
spec = *specs[spec_i];
}
SDL_free(specs);
}
std::unique_ptr<SDL_Camera, decltype(&SDL_CloseCamera)> camera {nullptr, &SDL_CloseCamera};
camera = {
//SDL_OpenCamera(devices[0], &spec),
SDL_OpenCamera(devices[0], nullptr),
//SDL_OpenCamera(device, nullptr),
SDL_OpenCamera(device, &spec),
&SDL_CloseCamera
};
SDL_free(devices);
if (!camera) {
std::cerr << "SDLVID error: failed opening camera device\n";
_ref--;
return nullptr;
}
// seems like we need this before get format() ?
// TODO: best would be waiting in thread, but that obv does not work well
// TODO: sometimes if the device is/was in use it will stay 0 for ever