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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file contains abstract classes used for media filter to handle video
// capture devices.
#ifndef MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_H_
#define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_H_
#include "base/memory/ref_counted.h"
#include "base/time.h"
#include "media/base/video_frame.h"
#include "media/video/capture/video_capture_types.h"
namespace media {
class VideoCapture {
public:
// Current status of the video capture device in the browser process. Browser
// process sends information about the current capture state and error to the
// renderer process using this type.
enum State {
kStarted,
kPaused,
kStopped,
kStopping,
kError,
};
// TODO(wjia): consider merging with media::VideoFrame if possible.
class VideoFrameBuffer : public base::RefCountedThreadSafe<VideoFrameBuffer> {
public:
VideoFrameBuffer()
: width(0),
height(0),
stride(0),
buffer_size(0),
memory_pointer(NULL) {}
~VideoFrameBuffer() {}
int width;
int height;
int stride;
size_t buffer_size;
uint8* memory_pointer;
base::Time timestamp;
private:
DISALLOW_COPY_AND_ASSIGN(VideoFrameBuffer);
};
// TODO(wjia): add error codes.
// Callbacks provided by client for notification of events.
class EventHandler {
public:
// Notify client that video capture has been started.
virtual void OnStarted(VideoCapture* capture) = 0;
// Notify client that video capture has been stopped.
virtual void OnStopped(VideoCapture* capture) = 0;
// Notify client that video capture has been paused.
virtual void OnPaused(VideoCapture* capture) = 0;
// Notify client that video capture has hit some error |error_code|.
virtual void OnError(VideoCapture* capture, int error_code) = 0;
// Notify client that a buffer is available.
virtual void OnBufferReady(VideoCapture* capture,
scoped_refptr<VideoFrameBuffer> buffer) = 0;
// Notify client about device info.
virtual void OnDeviceInfoReceived(
VideoCapture* capture,
const VideoCaptureParams& device_info) = 0;
};
// TODO(wjia): merge with similar struct in browser process and move it to
// video_capture_types.h.
struct VideoCaptureCapability {
int width; // desired width.
int height; // desired height.
int max_fps; // desired maximum frame rate.
int expected_capture_delay; // expected delay in millisecond.
media::VideoFrame::Format raw_type; // desired video type.
bool interlaced; // need interlace format.
bool resolution_fixed; // indicate requested resolution can't be altered.
};
VideoCapture() {}
virtual ~VideoCapture() {}
// Request video capture to start capturing with |capability|.
// Also register |handler| with video capture for event handling.
virtual void StartCapture(EventHandler* handler,
const VideoCaptureCapability& capability) = 0;
// Request video capture to stop capturing for client |handler|.
virtual void StopCapture(EventHandler* handler) = 0;
// Feed buffer to video capture when done with it.
virtual void FeedBuffer(scoped_refptr<VideoFrameBuffer> buffer) = 0;
virtual bool CaptureStarted() = 0;
virtual int CaptureWidth() = 0;
virtual int CaptureHeight() = 0;
virtual int CaptureFrameRate() = 0;
private:
DISALLOW_COPY_AND_ASSIGN(VideoCapture);
};
} // namespace media
#endif // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_H_
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