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camera: Added more accurate timestamps.

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This commit is contained in:
Ryan C. Gordon
2023-12-16 16:00:15 -05:00
parent d3e6ef3cc6
commit f87d536229
3 changed files with 32 additions and 4 deletions
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7
src/camera/v4l2/SDL_camera_v4l2.c
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@@ -67,7 +67,6 @@ struct SDL_PrivateCameraData
io_method io;
int nb_buffers;
struct buffer *buffers;
int first_start;
int driver_pitch;
};
@@ -129,6 +128,7 @@ static int V4L2_AcquireFrame(SDL_CameraDevice *device, SDL_Surface *frame, Uint6
}
}
*timestampNS = SDL_GetTicksNS(); // oh well, close enough.
frame->pixels = device->hidden->buffers[0].start;
frame->pitch = device->hidden->driver_pitch;
break;
@@ -161,6 +161,8 @@ static int V4L2_AcquireFrame(SDL_CameraDevice *device, SDL_Surface *frame, Uint6
frame->pitch = device->hidden->driver_pitch;
device->hidden->buffers[buf.index].available = 1;
*timestampNS = (((Uint64) buf.timestamp.tv_sec) * SDL_NS_PER_SECOND) + SDL_US_TO_NS(buf.timestamp.tv_usec);
#if DEBUG_CAMERA
SDL_Log("CAMERA: debug mmap: image %d/%d data[0]=%p", buf.index, device->hidden->nb_buffers, (void*)frame->pixels);
#endif
@@ -202,6 +204,8 @@ static int V4L2_AcquireFrame(SDL_CameraDevice *device, SDL_Surface *frame, Uint6
frame->pitch = device->hidden->driver_pitch;
device->hidden->buffers[i].available = 1;
*timestampNS = (((Uint64) buf.timestamp.tv_sec) * SDL_NS_PER_SECOND) + SDL_US_TO_NS(buf.timestamp.tv_usec);
#if DEBUG_CAMERA
SDL_Log("CAMERA: debug userptr: image %d/%d data[0]=%p", buf.index, device->hidden->nb_buffers, (void*)frame->pixels);
#endif
@@ -212,7 +216,6 @@ static int V4L2_AcquireFrame(SDL_CameraDevice *device, SDL_Surface *frame, Uint6
break;
}
*timestampNS = SDL_GetTicksNS(); // !!! FIXME: can we get this info more accurately from v4l2?
return 1;
}