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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
* video_capture_impl.h
#include "webrtc/api/video/video_frame.h"
#include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
#include "webrtc/modules/video_capture/video_capture.h"
#include "webrtc/modules/video_capture/video_capture_config.h"
#include "webrtc/rtc_base/criticalsection.h"
#include "webrtc/rtc_base/scoped_ref_ptr.h"
namespace webrtc
namespace videocapturemodule {
// Class definitions
class VideoCaptureImpl: public VideoCaptureModule, public VideoCaptureExternal
* Create a video capture module object
* id - unique identifier of this video capture module object
* deviceUniqueIdUTF8 - name of the device. Available names can be found by using GetDeviceName
static rtc::scoped_refptr<VideoCaptureModule> Create(
const char* deviceUniqueIdUTF8);
* Create a video capture module object used for external capture.
* id - unique identifier of this video capture module object
* externalCapture - [out] interface to call when a new frame is captured.
static rtc::scoped_refptr<VideoCaptureModule> Create(
VideoCaptureExternal*& externalCapture);
static DeviceInfo* CreateDeviceInfo();
// Helpers for converting between (integral) degrees and
// VideoRotation values. Return 0 on success.
static int32_t RotationFromDegrees(int degrees, VideoRotation* rotation);
static int32_t RotationInDegrees(VideoRotation rotation, int* degrees);
//Call backs
void RegisterCaptureDataCallback(
rtc::VideoSinkInterface<VideoFrame>* dataCallback) override;
void DeRegisterCaptureDataCallback() override;
int32_t SetCaptureRotation(VideoRotation rotation) override;
bool SetApplyRotation(bool enable) override;
bool GetApplyRotation() override {
return apply_rotation_;
const char* CurrentDeviceName() const override;
// Implement VideoCaptureExternal
// |capture_time| must be specified in NTP time format in milliseconds.
int32_t IncomingFrame(uint8_t* videoFrame,
size_t videoFrameLength,
const VideoCaptureCapability& frameInfo,
int64_t captureTime = 0) override;
// Platform dependent
int32_t StartCapture(const VideoCaptureCapability& capability) override
_requestedCapability = capability;
return -1;
int32_t StopCapture() override { return -1; }
bool CaptureStarted() override {return false; }
int32_t CaptureSettings(VideoCaptureCapability& /*settings*/) override
{ return -1; }
virtual ~VideoCaptureImpl();
int32_t DeliverCapturedFrame(VideoFrame& captureFrame);
char* _deviceUniqueId; // current Device unique name;
rtc::CriticalSection _apiCs;
VideoCaptureCapability _requestedCapability; // Should be set by platform dependent code in StartCapture.
void UpdateFrameCount();
uint32_t CalculateFrameRate(int64_t now_ns);
// last time the module process function was called.
int64_t _lastProcessTimeNanos;
// last time the frame rate callback function was called.
int64_t _lastFrameRateCallbackTimeNanos;
rtc::VideoSinkInterface<VideoFrame>* _dataCallBack;
int64_t _lastProcessFrameTimeNanos;
// timestamp for local captured frames
int64_t _incomingFrameTimesNanos[kFrameRateCountHistorySize];
VideoRotation _rotateFrame; // Set if the frame should be rotated by the
// capture module.
// Indicate whether rotation should be applied before delivered externally.
bool apply_rotation_;
} // namespace videocapturemodule
} // namespace webrtc