与众不同 windows phone (21) - Device(设备)之摄像头(拍摄照片, 录制视频)
与众不同 windows phone (21) - Device(设备)之摄像头(拍摄照片, 录制视频)
作者:webabcd
介绍
与众不同 windows phone 7.5 (sdk 7.1) 之设备
- 用摄像头拍摄照片
- 用摄像头录制视频
示例
1、演示如何使用摄像头拍摄照片
ImageDemo.xaml
<phone:PhoneApplicationPage x:Class="Demo.Device.Camera.ImageDemo" 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="Landscape" Orientation="Landscape" mc:Ignorable="d" d:DesignHeight="480" d:DesignWidth="800" shell:SystemTray.IsVisible="False"> <Grid x:Name="LayoutRoot" Background="Transparent"> <StackPanel Orientation="Vertical"> <StackPanel Orientation="Horizontal"> <Canvas Width="320" Height="240"> <Canvas.Background> <VideoBrush x:Name="videoBrush" /> </Canvas.Background> </Canvas> <!--显示拍摄到的图片--> <Image Name="imgCapture" Width="320" Height="240" Margin="20 0 0 0" /> <!--显示拍摄到的图片的缩略图--> <Image Name="imgCaptureThumbnail" Width="32" Height="24" Margin="20 0 0 0" /> </StackPanel> <StackPanel Orientation="Horizontal"> <Button x:Name="btnShutter" Content="快门" Click="btnShutter_Click" /> <Button x:Name="btnFlash" Content="闪光灯" Click="btnFlash_Click" /> <Button x:Name="btnResolution" Content="分辨率" Click="btnResolution_Click" /> </StackPanel> <TextBlock Name="lblMsg" /> </StackPanel> </Grid> </phone:PhoneApplicationPage>
ImageDemo.xaml.cs
/* * 演示如何使用摄像头拍摄照片 * * PhotoCamera - 用于提供相机功能 * CameraType - 摄像头的类型(Microsoft.Devices.CameraType 枚举) * Primary - 主摄像头 * FrontFacing - 前置摄像头 * AvailableResolutions - 获取摄像头的可用分辨率集合(返回一个 IEnumerable<Size> 类型的对象) * FlashMode - 相机的闪光灯模式(Microsoft.Devices.FlashMode 枚举) * On - 启用闪光灯 * Off - 禁用闪光灯 * Auto - 自动闪光灯 * RedEyeReduction - 消除红眼闪光灯 * Resolution - 相机的分辨率 * Orientation - 取景器与相机传感器对齐所需要顺时针旋转的度数(只读) * * CaptureImage() - 拍摄相机当前捕获到的照片 * IsFlashModeSupported(FlashMode mode) - 相机是否支持指定的闪光灯模式 * * Initialized - 相机初始化时触发的事件(事件参数为 CameraOperationCompletedEventArgs 类型) * CaptureStarted - 相机开始捕获图片时触发的事件 * CaptureCompleted - 相机捕获图片完成时触发的事件(事件参数为 CameraOperationCompletedEventArgs 类型) * CaptureImageAvailable - 获得了捕获到的图片时触发的事件(事件参数为 ContentReadyEventArgs 类型) * CaptureThumbnailAvailable - 获得了捕获到的图片的缩略图时触发的事件(事件参数为 ContentReadyEventArgs 类型) * * * CameraOperationCompletedEventArgs * Succeeded - 操作是否成功 * Exception - 异常信息 * * * ContentReadyEventArgs * ImageStream - 获取到的图像流 * * * 注:如果要求只使用前置摄像头的话,则在 manifest 中添加 <Capability Name="ID_HW_FRONTCAMERA"/> */ using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using Microsoft.Phone.Controls; using Microsoft.Devices; using System.IO; using System.IO.IsolatedStorage; using Microsoft.Xna.Framework.Media; using System.Windows.Navigation; using System.Windows.Media.Imaging; namespace Demo.Device.Camera { public partial class ImageDemo : PhoneApplicationPage { private PhotoCamera _camera; // 当前使用的摄像头分辨率在摄像头支持的分辨率集合中的索引 private int _currentResolutionIndex = 0; public ImageDemo() { InitializeComponent(); } protected override void OnNavigatedTo(NavigationEventArgs e) { // 设备是否支持主摄像头 if (PhotoCamera.IsCameraTypeSupported(CameraType.Primary)) { // 获取主摄像头,并注册相关事件 _camera = new PhotoCamera(CameraType.Primary); _camera.Initialized += _camera_Initialized; _camera.CaptureStarted += _camera_CaptureStarted; _camera.CaptureCompleted += _camera_CaptureCompleted; _camera.CaptureImageAvailable += _camera_CaptureImageAvailable; _camera.CaptureThumbnailAvailable += _camera_CaptureThumbnailAvailable; // 在 VideoBrush 上显示摄像头捕获到的实时信息 videoBrush.SetSource(_camera); lblMsg.Text = "设备的主摄像头正在工作"; } else { lblMsg.Text = "此设备没有主摄像头"; btnShutter.IsEnabled = false; btnFlash.IsEnabled = false; btnResolution.IsEnabled = false; } } protected override void OnNavigatingFrom(NavigatingCancelEventArgs e) { // 释放相关资源 if (_camera != null) { _camera.Dispose(); _camera.Initialized -= _camera_Initialized; _camera.CaptureStarted -= _camera_CaptureStarted; _camera.CaptureCompleted -= _camera_CaptureCompleted; _camera.CaptureImageAvailable -= _camera_CaptureImageAvailable; _camera.CaptureThumbnailAvailable -= _camera_CaptureThumbnailAvailable; } } void _camera_Initialized(object sender, CameraOperationCompletedEventArgs e) { if (e.Succeeded) { this.Dispatcher.BeginInvoke(delegate() { // 初始化闪光灯模式 _camera.FlashMode = FlashMode.Off; btnFlash.Content = "闪光灯:Off"; // 初始化分辨率设置 _camera.Resolution = _camera.AvailableResolutions.ElementAt<Size>(_currentResolutionIndex); btnResolution.Content = "分辨率:" + _camera.AvailableResolutions.ElementAt<Size>(_currentResolutionIndex); lblMsg.Text = "主摄像头初始化成功"; }); } } void _camera_CaptureStarted(object sender, EventArgs e) { // 开始捕获 this.Dispatcher.BeginInvoke(delegate() { lblMsg.Text = "图片开始捕获"; }); } void _camera_CaptureCompleted(object sender, CameraOperationCompletedEventArgs e) { // 拍照完成 this.Dispatcher.BeginInvoke(delegate() { lblMsg.Text = "图片捕获完成"; }); } void _camera_CaptureImageAvailable(object sender, ContentReadyEventArgs e) { // 获得了所拍摄的图片 this.Dispatcher.BeginInvoke(delegate() { var bitmapImage = new BitmapImage(); bitmapImage.SetSource(e.ImageStream); imgCapture.Source = bitmapImage; }); } public void _camera_CaptureThumbnailAvailable(object sender, ContentReadyEventArgs e) { // 获得了所拍摄的图片的缩略图 this.Dispatcher.BeginInvoke(delegate() { var bitmapImage = new BitmapImage(); bitmapImage.SetSource(e.ImageStream); imgCaptureThumbnail.Source = bitmapImage; }); } private void btnShutter_Click(object sender, RoutedEventArgs e) { if (_camera != null) { try { // 拍摄摄像头当前捕获的图片 _camera.CaptureImage(); } catch (Exception ex) { lblMsg.Text = "拍摄失败:" + ex.Message; } } } // 摄像头分辨率的轮换 private void btnResolution_Click(object sender, RoutedEventArgs e) { if (++_currentResolutionIndex >= _camera.AvailableResolutions.Count()) _currentResolutionIndex = 0; _camera.Resolution = _camera.AvailableResolutions.ElementAt<Size>(_currentResolutionIndex); btnResolution.Content = "分辨率:" + _camera.AvailableResolutions.ElementAt<Size>(_currentResolutionIndex); } // 闪光灯模式的轮换 private void btnFlash_Click(object sender, RoutedEventArgs e) { switch (_camera.FlashMode) { case FlashMode.Off: if (_camera.IsFlashModeSupported(FlashMode.On)) { _camera.FlashMode = FlashMode.On; btnFlash.Content = "闪光灯:On"; } break; case FlashMode.On: if (_camera.IsFlashModeSupported(FlashMode.RedEyeReduction)) { _camera.FlashMode = FlashMode.RedEyeReduction; btnFlash.Content = "闪光灯:RedEyeReduction"; } else if (_camera.IsFlashModeSupported(FlashMode.Auto)) { _camera.FlashMode = FlashMode.Auto; btnFlash.Content = "闪光灯:Auto"; } else { _camera.FlashMode = FlashMode.Off; btnFlash.Content = "闪光灯:Off"; } break; case FlashMode.RedEyeReduction: if (_camera.IsFlashModeSupported(FlashMode.Auto)) { _camera.FlashMode = FlashMode.Auto; btnFlash.Content = "闪光灯:Auto"; } else { _camera.FlashMode = FlashMode.Off; btnFlash.Content = "闪光灯:Off"; } break; case FlashMode.Auto: if (_camera.IsFlashModeSupported(FlashMode.Off)) { _camera.FlashMode = FlashMode.Off; btnFlash.Content = "闪光灯:Off"; } break; } } } }
2、演示如何使用摄像头录制视频
VideoDemo.xaml
<phone:PhoneApplicationPage x:Class="Demo.Device.Camera.VideoDemo" 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="Landscape" Orientation="Landscape" mc:Ignorable="d" d:DesignHeight="480" d:DesignWidth="800" shell:SystemTray.IsVisible="False"> <Grid x:Name="LayoutRoot" Background="Transparent"> <StackPanel Orientation="Vertical"> <StackPanel Orientation="Horizontal"> <!--用于实时显示摄像头捕获到的信息--> <Canvas Width="320" Height="240"> <Canvas.Background> <VideoBrush x:Name="videoBrush" /> </Canvas.Background> </Canvas> <!--用于播放视频--> <MediaElement x:Name="mediaElement" Width="320" Height="240" /> </StackPanel> <StackPanel Orientation="Horizontal"> <Button x:Name="btnStartRecord" Content="开始录制" Click="btnStartRecord_Click" /> <Button x:Name="btnStopRecord" Content="停止录制" Click="btnStopRecord_Click" /> <Button x:Name="btnStartPlayback" Content="开始播放" Click="btnStartPlayback_Click" /> <Button x:Name="btnPausePlayback" Content="暂停播放" Click="btnPausePlayback_Click" /> </StackPanel> <TextBlock Name="lblMsg" /> </StackPanel> </Grid> </phone:PhoneApplicationPage>
VideoDemo.xaml.cs
/* * 演示如何通过摄像头录制视频并保存到独立存储,以及如何播放独立存储中的视频 * * CaptureSource - 操作相关捕获设备的类 * VideoCaptureDevice - 关联的视频捕获设备(System.Windows.Media.VideoCaptureDevice 类型) * AudioCaptureDevice - 关联的音频捕获设备(System.Windows.Media.AudioCaptureDevice 类型) * State - 捕获的相关状态(System.Windows.Media.CaptureState 枚举) * Stopped, Started, Failed * Start() - 启动关联的视频捕获设备和音频捕获设备 * Stop() - 关闭关联的视频捕获设备和音频捕获设备 * CaptureImageAsync() - 异步捕获图像 * CaptureImageCompleted - 异步捕获图像完成后所触发的事件 * CaptureFailed - 捕获失败时所触发的事件 * * * FileSink - 用于将捕获到的视频保存到独立存储的类 * CaptureSource - 关联的 CaptureSource 对象 * IsolatedStorageFileName - 需要保存到的独立存储的地址 * * * CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice() - 获取默认的视频捕获设备,返回一个 VideoCaptureDevice 对象 * CaptureDeviceConfiguration.GetAvailableVideoCaptureDevices() - 获取可用的视频捕获设备集合,返回一个 VideoCaptureDevice 对象集合 * CaptureDeviceConfiguration.GetDefaultAudioCaptureDevice() - 获取默认的音频捕获设备,返回一个 AudioCaptureDevice 对象 * CaptureDeviceConfiguration.GetAvailableAudioCaptureDevices() - 获取可用的音频捕获设备集合,返回一个 AudioCaptureDevice 对象集合 * * * VideoCaptureDevice - 用于描述视频捕获设备的类 * DesiredFormat - 期望的视频格式 * SupportedFormats - 支持的视频格式 * FriendlyName - 设备的名称 * IsDefaultDevice - 是否是视频捕获的默认设备 * * * AudioCaptureDevice - 用于描述音频捕获设备的类 * AudioFrameSize - 音频的帧大小(缓冲大小),10 毫秒 - 2000 毫秒之间,默认值是 1000 毫秒 * DesiredFormat - 期望的音频格式 * SupportedFormats - 支持的音频格式 * FriendlyName - 设备的名称 * IsDefaultDevice - 是否是音频捕获的默认设备 */ using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using Microsoft.Phone.Controls; using System.Windows.Navigation; using System.IO.IsolatedStorage; using System.IO; namespace Demo.Device.Camera { public partial class VideoDemo : PhoneApplicationPage { private CaptureSource _captureSource; private FileSink _fileSink; // 保存到独立存储的视频的地址 private string _isoVideoFileName = "myVideo.mp4"; // 需要播放的独立存储中的视频文件的视频流 private IsolatedStorageFileStream _isoVideoFile; public VideoDemo() { InitializeComponent(); } protected override void OnNavigatedTo(NavigationEventArgs e) { base.OnNavigatedTo(e); if (_captureSource == null) { _captureSource = new CaptureSource(); _captureSource.CaptureFailed += _captureSource_CaptureFailed; _fileSink = new FileSink(); VideoCaptureDevice videoCaptureDevice = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice(); if (videoCaptureDevice == null) { lblMsg.Text = "该设备不支持视频捕获"; } else { // 让 VideoBrush 显示视频捕获的实时信息 videoBrush.SetSource(_captureSource); // 调用了 CaptureSource.Start() 之后才会开始捕获视频 _captureSource.Start(); lblMsg.Text = "设备正在捕获视频中。。。"; } } } protected override void OnNavigatedFrom(NavigationEventArgs e) { // 垃圾回收 DisposeVideoPlayer(); DisposeVideoRecorder(); base.OnNavigatedFrom(e); } private void _captureSource_CaptureFailed(object sender, ExceptionRoutedEventArgs e) { this.Dispatcher.BeginInvoke(delegate() { lblMsg.Text = "视频捕获失败:" + e.ToString(); }); } public void mediaElement_MediaEnded(object sender, RoutedEventArgs e) { // 视频播放完成后,重播 mediaElement.Position = TimeSpan.Zero; mediaElement.Play(); } // 清理视频播放的相关资源 private void DisposeVideoPlayer() { // 注:对于那些没有实现 Dispose() 方法的对象,就把他们设置为 null,这样垃圾收集器会在需要的时候回收这些对象占用的内存 mediaElement.Stop(); mediaElement.MediaEnded -= mediaElement_MediaEnded; mediaElement.Source = null; _isoVideoFile = null; } // 清理视频录制的相关资源 private void DisposeVideoRecorder() { // 注:对于那些没有实现 Dispose() 方法的对象,就把他们设置为 null,这样垃圾收集器会在需要的时候回收这些对象占用的内存 if (_captureSource != null) { if (_captureSource.VideoCaptureDevice != null && _captureSource.State == CaptureState.Started) _captureSource.Stop(); _captureSource.CaptureFailed -= _captureSource_CaptureFailed; _captureSource = null; _fileSink = null; } } // 录制捕获到的视频 private void btnStartRecord_Click(object sender, RoutedEventArgs e) { try { // 清除视频播放的相关资源,因为系统无法同时录制视频和播放视频(也无法同时播放两个视频) DisposeVideoPlayer(); if (_captureSource.VideoCaptureDevice != null && _captureSource.State == CaptureState.Started) { _captureSource.Stop(); // 将 FileSink 与 CaptureSource 做关联 _fileSink.CaptureSource = _captureSource; // 设置录制好的视频所需保存到的独立存储的地址 _fileSink.IsolatedStorageFileName = _isoVideoFileName; } if (_captureSource.VideoCaptureDevice != null && _captureSource.State == CaptureState.Stopped) { // 开始捕获,如果关联了 FileSink,则会将捕获到的视频流以流的方式写入到指定的独立存储地址 _captureSource.Start(); } lblMsg.Text = "开始录制视频"; } catch (Exception ex) { lblMsg.Text = "开始录制视频失败:" + ex.ToString(); } } // 停止录制 private void btnStopRecord_Click(object sender, RoutedEventArgs e) { try { if (_captureSource.VideoCaptureDevice != null && _captureSource.State == CaptureState.Started) { _captureSource.Stop(); // 清空 FileSink 的相关联信息 _fileSink.CaptureSource = null; _fileSink.IsolatedStorageFileName = null; } lblMsg.Text = "停止录制视频"; } catch (Exception ex) { lblMsg.Text = "停止录制视频失败:" + ex.ToString(); } } // 播放视频 private void btnStartPlayback_Click(object sender, RoutedEventArgs e) { if (_isoVideoFile != null) { mediaElement.Play(); } else { // 停止视频捕获,因为系统无法同时录制视频和播放视频(也无法同时播放两个视频) _captureSource.Stop(); _isoVideoFile = new IsolatedStorageFileStream(_isoVideoFileName, FileMode.Open, FileAccess.Read, IsolatedStorageFile.GetUserStoreForApplication()); // 用 MediaElement 播放独立存储中的指定视频 mediaElement.SetSource(_isoVideoFile); mediaElement.MediaEnded += mediaElement_MediaEnded; mediaElement.Play(); } lblMsg.Text = "开始播放视频"; } // 暂停播放视频 private void btnPausePlayback_Click(object sender, RoutedEventArgs e) { mediaElement.Pause(); lblMsg.Text = "暂停播放视频"; } } }
OK
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