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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"
namespace media {
class VideoCapture {
public:
// TODO(wjia): this type should be defined in a common place and
// shared with device manager.
typedef uint64 VideoCaptureId;
// 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,
kError,
};
// Parameters for starting video capture and device information.
struct CaptureParams {
CaptureParams() {}
~CaptureParams() {}
uint32 width;
uint32 height;
uint32 frame_rate;
VideoCaptureId session_id;
};
// TODO(wjia): consider merging with media::VideoFrame if possible.
class VideoFrameBuffer : public base::RefCountedThreadSafe<VideoFrameBuffer> {
public:
VideoFrameBuffer() {}
~VideoFrameBuffer() {}
uint32 width;
uint32 height;
int stride;
size_t buffer_size;
void* 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;
};
struct VideoCaptureCapability {
uint32 width; // desired width.
uint32 height; // desired height.
uint32 max_fps; // desired maximum frame rate.
uint32 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;
// TODO(wjia): Add FeedBuffer when buffer sharing is needed between video
// capture and downstream module.
// virtual void FeedBuffer(scoped_refptr<VideoFrameBuffer> buffer) = 0;
virtual bool CaptureStarted() = 0;
virtual uint32 CaptureWidth() = 0;
virtual uint32 CaptureHeight() = 0;
virtual uint32 CaptureFrameRate() = 0;
private:
DISALLOW_COPY_AND_ASSIGN(VideoCapture);
};
} // namespace media
#endif // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_H_
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