原文:

与众不同 windows phone (41) - 8.0 相机和照片: 通过 AudioVideoCaptureDevice 捕获视频和音频

作者：

介绍

与众不同 windows phone 8.0 之 相机和照片

• 通过 AudioVideoCaptureDevice 捕获视频和音频

示例

演示 AudioVideoCaptureDevice（wp8）的应用

CameraAndPhoto/AudioVideoCaptureDeviceDemo.xaml

CameraAndPhoto/AudioVideoCaptureDeviceDemo.xaml.cs

/* * 演示 AudioVideoCaptureDevice（wp8）的应用 *  * 关于 CaptureSource, FileSink（wp7）的应用参见 * http://www.cnblogs.com/webabcd/archive/2012/08/13/2635698.html * http://www.cnblogs.com/webabcd/archive/2012/08/15/2639428.html *  *  * 注： * 需要在 manifest 中增加配置 
      
      
      */using System;using System.Collections.Generic;using System.Linq;using System.Windows;using Microsoft.Phone.Controls;using Windows.Phone.Media.Capture;using Microsoft.Devices;using Windows.Storage.Streams;using Windows.Storage;using Microsoft.Phone.Tasks;namespace Demo.CameraAndPhoto{    public partial class AudioVideoCaptureDeviceDemo : PhoneApplicationPage    {        private AudioVideoCaptureDevice _captureDevice;        private IRandomAccessStream _stream;        public AudioVideoCaptureDeviceDemo()        {            InitializeComponent();            this.Loaded += AudioVideoCaptureDeviceDemo_Loaded;        }        private async void AudioVideoCaptureDeviceDemo_Loaded(object sender, RoutedEventArgs e)        {            // 一些概述类的说明            Summary();            // 是否有后置摄像头            if (AudioVideoCaptureDevice.AvailableSensorLocations.Contains(CameraSensorLocation.Back))            {                // 获取后置摄像头摄像时的可用分辨率                IReadOnlyList
     
       supportedResolutions = AudioVideoCaptureDevice.GetAvailableCaptureResolutions(CameraSensorLocation.Back);                Windows.Foundation.Size resolution = supportedResolutions[0];                try                {                    // 让后置摄像头以指定的分辨率捕获镜头内容                    _captureDevice = await AudioVideoCaptureDevice.OpenAsync(CameraSensorLocation.Back, resolution);                    // AudioVideoCaptureDevice.OpenForVideoOnlyAsync() - 仅捕获视频                    // AudioVideoCaptureDevice.OpenForAudioOnlyAsync() - 仅捕获音频                    // 录像失败时触发的事件                    _captureDevice.RecordingFailed += _captureDevice_RecordingFailed;                    /*                     * SetCaptureResolutionAsync() - 设置摄像的分辨率                     * CaptureResolution - 获取当前摄像的分辨率                     * VideoEncodingFormat - 当前的视频编码格式                     * AudioEncodingFormat - 当前的音频编码格式                     * FocusRegion - 对焦区域                     * SensorLocation - 当前摄像头的位置（CameraSensorLocation 枚举：Back 或 Front）                     * SensorRotationInDegrees - 获取摄像头传感器相对于屏幕的旋转度数                     * FocusAsync() - 自动对焦                     * ResetFocusAsync() - 复位对焦                     */                    /*                     * KnownCameraAudioVideoProperties 属性集包括                     *     VideoFrameRate - 每秒抓取的视频帧数                     *     H264EncodingProfile - H264 编码的 profile（H264EncoderProfile 枚举）                     *     H264EncodingLevel - H264 编码的 level（H264EncoderLevel 枚举）                     *     H264EnableKeyframes - 是否启用关键帧                     *     H264QuantizationParameter - QP 值，低的 QP 会保留大部分空间的详细信息，从而达到最佳质量，高的 QP 会在一定程度上造成质量的损失，但能帮助编码器实现较低的比特率                     *     H264RequestDropNextNFrames - 指定编码器应丢弃的帧数                     *     H264RequestIdrFrame - 此属性设置为 true 时，系统请求编码流程进行瞬时解码刷新(IDR)                     *     UnmuteAudioWhileRecording - 此属性设置为 true 时，能在记录期间为音频取消静音                     *     VideoTorchMode - 录像时如何使用闪光灯（VideoTorchMode 枚举：Off, Auto, On）                     *     VideoTorchPower - 录像时闪光灯的亮度，无单位且不同设备上的值不同                     */                    _captureDevice.SetProperty(KnownCameraAudioVideoProperties.H264EncodingProfile, H264EncoderProfile.Baseline);                    /*                     * KnownCameraGeneralProperties 属性集包括                     *     AutoFocusRange - 自动对焦的范围（AutoFocusRange 枚举，包括微距等）                     *     EncodeWithOrientation - 视频编码时的旋转角度，必须是 90 的倍数                     *     SpecifiedCaptureOrientation -  元数据中的旋转角度，必须是 90 的倍数                     *     IsShutterSoundEnabledByUser - 用户是否启用了快门声音，只读                     *     IsShutterSoundRequiredForRegion - 运行应用程序的区域是否需要快门声音（有些区域为了保护隐私，要求照相或录像必须要有快门声音），只读                     *     PlayShutterSoundOnCapture - 指定捕获时是否播放快门声音                     *     ManualFocusPosition - 手动对焦的位置                     */                    _captureDevice.SetProperty(KnownCameraGeneralProperties.AutoFocusRange, AutoFocusRange.Normal);                    _captureDevice.SetProperty(KnownCameraGeneralProperties.EncodeWithOrientation, _captureDevice.SensorRotationInDegrees);                    // 获取指定属性的值                    // _captureDevice.GetProperty(KnownCameraGeneralProperties.IsShutterSoundEnabledByUser);                    /*                     * 获取指定的范围类属性在当前摄像头中所允许的值的范围                     */                    // AudioVideoCaptureDevice.GetSupportedPropertyRange(CameraSensorLocation.Back, KnownCameraAudioVideoProperties.H264QuantizationParameter);                    /*                     * 获取指定的值类属性在当前摄像头中所允许的值的列表                     */                    // AudioVideoCaptureDevice.GetSupportedPropertyValues(CameraSensorLocation.Back, KnownCameraAudioVideoProperties.H264EncodingProfile);                    // 实时显示捕获的内容                    videoBrush.SetSource(_captureDevice); // 扩展方法来自：Microsoft.Devices.CameraVideoBrushExtensions                    rt.Angle = _captureDevice.SensorRotationInDegrees;                }                catch (Exception ex)                {                    MessageBox.Show(ex.ToString());                }            }            else            {                MessageBox.Show("没有后置摄像头");            }        }        // 录像失败        void _captureDevice_RecordingFailed(AudioVideoCaptureDevice sender, CaptureFailedEventArgs args)        {            this.Dispatcher.BeginInvoke(delegate()            {                MessageBox.Show("error: " + args.ErrorCode.ToString());            });        }        // 开始录像        private async void btnCapture_Click(object sender, RoutedEventArgs e)        {            try            {                // 获取应用程序数据存储文件夹                StorageFolder applicationFolder = ApplicationData.Current.LocalFolder;                // 在指定的应用程序数据存储文件夹内创建指定的文件                StorageFile storageFile = await applicationFolder.CreateFileAsync("webabcdTest.mp4", CreationCollisionOption.ReplaceExisting);                // 打开文件流，准备写入录像数据                _stream = await storageFile.OpenAsync(FileAccessMode.ReadWrite);                // 录制视频到指定的流                await _captureDevice.StartRecordingToStreamAsync(_stream);                btnCapture.IsEnabled = false;                btnStop.IsEnabled = true;            }            catch (Exception ex)            {                MessageBox.Show(ex.ToString());            }        }        // 停止录像        private async void btnStop_Click(object sender, RoutedEventArgs e)        {            // 停止录像            await _captureDevice.StopRecordingAsync();            _stream.Dispose();            btnCapture.IsEnabled = true;            btnStop.IsEnabled = false;        }        // 播放录制的内容        private void btnPlay_Click(object sender, RoutedEventArgs e)        {            // 启动媒体播放器，播放录制的内容            MediaPlayerLauncher mediaPlayerLauncher = new MediaPlayerLauncher();            // new Uri("webabcdTest.mp4", UriKind.Relative) 结合 MediaLocationType.Data，则系统会先在应用程序存储的 Local 目录下找，找不到再到 Local/IsolatedStorage 目录下找            mediaPlayerLauncher.Media = new Uri("webabcdTest.mp4", UriKind.Relative);            mediaPlayerLauncher.Location = MediaLocationType.Data;            mediaPlayerLauncher.Controls = MediaPlaybackControls.Pause | MediaPlaybackControls.Stop;            mediaPlayerLauncher.Orientation = MediaPlayerOrientation.Landscape;            mediaPlayerLauncher.Show();        }        private void Summary()        {            lblMsg.Text = "";            // 获取电话上的可用摄像头            foreach (CameraSensorLocation csl in AudioVideoCaptureDevice.AvailableSensorLocations)            {                // Back 或 Front                lblMsg.Text += "摄像头：" + csl.ToString();                lblMsg.Text += System.Environment.NewLine;                // 摄像所支持的分辨率                lblMsg.Text += "摄像的可用分辨率：";                foreach (var size in AudioVideoCaptureDevice.GetAvailableCaptureResolutions(csl))                {                    lblMsg.Text += size.Width + "*" + size.Height + " ";                }                lblMsg.Text += System.Environment.NewLine;                lblMsg.Text += System.Environment.NewLine;                // 关于 CameraButtons 参见以前的文章：http://www.cnblogs.com/webabcd/archive/2012/08/15/2639428.html                // CameraButtons.ShutterKeyHalfPressed 事件，CameraButtons.ShutterKeyPressed 事件，CameraButtons.ShutterKeyReleased 事件            }            lblMsg.Text += "终端所支持的视频编码格式：";            foreach (CameraCaptureVideoFormat format in AudioVideoCaptureDevice.SupportedVideoEncodingFormats)            {                lblMsg.Text += format.ToString() + " ";            }            lblMsg.Text += System.Environment.NewLine;            lblMsg.Text += "终端所支持的音频编码格式：";            foreach (CameraCaptureAudioFormat format in AudioVideoCaptureDevice.SupportedAudioEncodingFormats)            {                lblMsg.Text += format.ToString() + " ";            }            lblMsg.Text += System.Environment.NewLine;        }    }}
     

OK