与众不同 windows phone (41) - 8.0 相机和照片: 通过 AudioVideoCaptureDevice 捕获视频和音频
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：webabcd
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
<phone:PhoneApplicationPage x:Class="Demo.CameraAndPhoto.AudioVideoCaptureDeviceDemo" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="Portrait" Orientation="Portrait" mc:Ignorable="d" shell:SystemTray.IsVisible="True"> <Grid x:Name="LayoutRoot" Background="Transparent"> <StackPanel> <StackPanel Orientation="Horizontal"> <Canvas Width="240" Height="180" RenderTransformOrigin="0.5 0.5"> <Canvas.Background> <VideoBrush x:Name="videoBrush" /> </Canvas.Background> <Canvas.RenderTransform> <RotateTransform x:Name="rt" /> </Canvas.RenderTransform> </Canvas> <MediaElement Name="mediaElement" Width="240" Height="180" /> </StackPanel> <StackPanel Orientation="Horizontal" Margin="0 50 0 0"> <Button Name="btnCapture" Content="录像" Click="btnCapture_Click" /> <Button Name="btnStop" Content="停止" Click="btnStop_Click" IsEnabled="False" /> <Button Name="btnPlay" Content="播放" Click="btnPlay_Click" /> </StackPanel> <TextBlock x:Name="lblMsg" TextWrapping="Wrap" Margin="0 10 0 0" /> </StackPanel> </Grid> </phone:PhoneApplicationPage>
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 <Capability Name="ID_CAP_ISV_CAMERA" /> <Capability Name="ID_CAP_MICROPHONE" /> <Capability Name="ID_CAP_MEDIALIB_PHOTO" /> */ 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<Windows.Foundation.Size> 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
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