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// Copyright (c) 2012 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.
// Windows specific implementation of VideoCaptureDevice.
// DirectShow is used for capturing. DirectShow provide its own threads
// for capturing.
#ifndef MEDIA_VIDEO_CAPTURE_WIN_CAPABILITY_LIST_WIN_H_
#define MEDIA_VIDEO_CAPTURE_WIN_CAPABILITY_LIST_WIN_H_
#include <list>
#include "base/threading/non_thread_safe.h"
#include "media/video/capture/video_capture_types.h"
namespace media {
struct VideoCaptureCapabilityWin : public VideoCaptureCapability {
explicit VideoCaptureCapabilityWin(int index)
: stream_index(index),
frame_rate_numerator(0),
frame_rate_denominator(1) {}
int stream_index;
// Internally to Media Foundation Api type devices we use rational framerates
// so framerates can be properly represented, f.i. 29.971fps= 30000/1001.
int frame_rate_numerator;
int frame_rate_denominator;
};
class CapabilityList : public base::NonThreadSafe {
public:
CapabilityList();
~CapabilityList();
bool empty() const { return capabilities_.empty(); }
// Appends an entry to the list.
void Add(const VideoCaptureCapabilityWin& capability);
// Loops through the list of capabilities and returns an index of the best
// matching capability. The algorithm prioritizes height, width, frame rate
// and color format in that order.
const VideoCaptureCapabilityWin& GetBestMatchedCapability(
int requested_width, int requested_height,
int requested_frame_rate) const;
private:
typedef std::list<VideoCaptureCapabilityWin> Capabilities;
Capabilities capabilities_;
DISALLOW_COPY_AND_ASSIGN(CapabilityList);
};
} // namespace media
#endif // MEDIA_VIDEO_CAPTURE_WIN_CAPABILITY_LIST_WIN_H_
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