// shared with device manager.
typedef int VideoCaptureSessionId;
-// Color formats from camera.
+// Color formats from camera. This list is sorted in order of preference.
enum VideoPixelFormat {
- PIXEL_FORMAT_UNKNOWN, // Color format not set.
PIXEL_FORMAT_I420,
- PIXEL_FORMAT_YUY2,
+ PIXEL_FORMAT_YV12,
+ PIXEL_FORMAT_NV21,
PIXEL_FORMAT_UYVY,
+ PIXEL_FORMAT_YUY2,
PIXEL_FORMAT_RGB24,
PIXEL_FORMAT_ARGB,
PIXEL_FORMAT_MJPEG,
- PIXEL_FORMAT_NV21,
- PIXEL_FORMAT_YV12,
+ PIXEL_FORMAT_TEXTURE, // Capture format as a GL texture.
+ PIXEL_FORMAT_UNKNOWN, // Color format not set.
PIXEL_FORMAT_MAX,
};
+// Policies for capture devices that has source content with dynamic resolution.
+enum ResolutionChangePolicy {
+ // Capture device outputs a fixed resolution all the time. The resolution of
+ // the first frame is the resolution for all frames.
+ // It is implementation specific for the capture device to scale, letter-box
+ // and pillar-box. The only guarantee is that resolution will never change.
+ RESOLUTION_POLICY_FIXED,
+
+ // Capture device outputs frames with dynamic resolution. The width and height
+ // will not exceed the maximum dimensions specified. The typical scenario is
+ // the frames will have the same aspect ratio as the original content and
+ // scaled down to fit inside the limit.
+ RESOLUTION_POLICY_DYNAMIC_WITHIN_LIMIT,
+
+ RESOLUTION_POLICY_LAST,
+};
+
+// Some drivers use rational time per frame instead of float frame rate, this
+// constant k is used to convert between both: A fps -> [k/k*A] seconds/frame.
+const int kFrameRatePrecision = 10000;
+
// Video capture format specification.
// This class is used by the video capture device to specify the format of every
// frame captured and returned to a client. It is also used to specify a
public:
VideoCaptureFormat();
VideoCaptureFormat(const gfx::Size& frame_size,
- int frame_rate,
+ float frame_rate,
VideoPixelFormat pixel_format);
+ std::string ToString() const;
+ static std::string PixelFormatToString(VideoPixelFormat format);
+
// Checks that all values are in the expected range. All limits are specified
// in media::Limits.
bool IsValid() const;
gfx::Size frame_size;
- int frame_rate;
+ float frame_rate;
+ VideoPixelFormat pixel_format;
+};
+
+// Image capture format specification.
+// This class is used by the video capture device to specify the format of a
+// still image captured and returned to a client. A list of these is also
+// provided when client queries supported formats for still image capture.
+class MEDIA_EXPORT ImageCaptureFormat {
+ public:
+ ImageCaptureFormat();
+
+ ImageCaptureFormat(const gfx::Size& frame_size,
+ VideoPixelFormat pixel_format);
+
+ gfx::Size frame_size;
VideoPixelFormat pixel_format;
};
typedef std::vector<VideoCaptureFormat> VideoCaptureFormats;
+typedef std::vector<ImageCaptureFormat> ImageCaptureFormats;
+
// Parameters for starting video capture.
// This class is used by the client of a video capture device to specify the
// format of frames in which the client would like to have captured frames
// Requests a resolution and format at which the capture will occur.
VideoCaptureFormat requested_format;
- // Allow mid-capture resolution change.
- bool allow_resolution_change;
+ // Policy for resolution change.
+ ResolutionChangePolicy resolution_change_policy;
};
} // namespace media