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camera: Windows support, through the Media Foundation API!

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This commit is contained in:
Ryan C. Gordon
2024-01-31 15:07:07 -05:00
parent 3dca8a03da
commit 7191a97fe3
11 changed files with 998 additions and 44 deletions
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42
src/camera/v4l2/SDL_camera_v4l2.c
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@@ -631,39 +631,7 @@ static SDL_bool FindV4L2CameraDeviceByBusInfoCallback(SDL_CameraDevice *device,
return (SDL_strcmp(handle->bus_info, (const char *) userdata) == 0);
}
typedef struct FormatAddData
{
SDL_CameraSpec *specs;
int num_specs;
int allocated_specs;
} FormatAddData;
static int AddCameraCompleteFormat(FormatAddData *data, Uint32 fmt, int w, int h, int interval_numerator, int interval_denominator)
{
SDL_assert(data != NULL);
if (data->allocated_specs <= data->num_specs) {
const int newalloc = data->allocated_specs ? (data->allocated_specs * 2) : 16;
void *ptr = SDL_realloc(data->specs, sizeof (SDL_CameraSpec) * newalloc);
if (!ptr) {
return -1;
}
data->specs = (SDL_CameraSpec *) ptr;
data->allocated_specs = newalloc;
}
SDL_CameraSpec *spec = &data->specs[data->num_specs];
spec->format = fmt;
spec->width = w;
spec->height = h;
spec->interval_numerator = interval_numerator;
spec->interval_denominator = interval_denominator;
data->num_specs++;
return 0;
}
static int AddCameraFormat(const int fd, FormatAddData *data, Uint32 sdlfmt, Uint32 v4l2fmt, int w, int h)
static int AddCameraFormat(const int fd, CameraFormatAddData *data, Uint32 sdlfmt, Uint32 v4l2fmt, int w, int h)
{
struct v4l2_frmivalenum frmivalenum;
SDL_zero(frmivalenum);
@@ -679,7 +647,7 @@ static int AddCameraFormat(const int fd, FormatAddData *data, Uint32 sdlfmt, Uin
const float fps = (float) denominator / (float) numerator;
SDL_Log("CAMERA: * Has discrete frame interval (%d / %d), fps=%f", numerator, denominator, fps);
#endif
if (AddCameraCompleteFormat(data, sdlfmt, w, h, numerator, denominator) == -1) {
if (SDL_AddCameraFormat(data, sdlfmt, w, h, numerator, denominator) == -1) {
return -1; // Probably out of memory; we'll go with what we have, if anything.
}
frmivalenum.index++; // set up for the next one.
@@ -691,7 +659,7 @@ static int AddCameraFormat(const int fd, FormatAddData *data, Uint32 sdlfmt, Uin
const float fps = (float) d / (float) n;
SDL_Log("CAMERA: * Has %s frame interval (%d / %d), fps=%f", (frmivalenum.type == V4L2_FRMIVAL_TYPE_STEPWISE) ? "stepwise" : "continuous", n, d, fps);
#endif
if (AddCameraCompleteFormat(data, sdlfmt, w, h, n, d) == -1) {
if (SDL_AddCameraFormat(data, sdlfmt, w, h, n, d) == -1) {
return -1; // Probably out of memory; we'll go with what we have, if anything.
}
d += (int) frmivalenum.stepwise.step.denominator;
@@ -739,7 +707,7 @@ static void MaybeAddDevice(const char *path)
SDL_Log("CAMERA: V4L2 camera path='%s' bus_info='%s' name='%s'", path, (const char *) vcap.bus_info, vcap.card);
#endif
FormatAddData add_data;
CameraFormatAddData add_data;
SDL_zero(add_data);
struct v4l2_fmtdesc fmtdesc;
@@ -911,5 +879,5 @@ CameraBootStrap V4L2_bootstrap = {
"v4l2", "SDL Video4Linux2 camera driver", V4L2_Init, SDL_FALSE
};
#endif // SDL_CAMERA_V4L2
#endif // SDL_CAMERA_DRIVER_V4L2