與眾不同 windows phone (41) - 8.0 相機和照片: 通過 AudioVideoCaptureDevice 捕獲視頻和音頻

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與眾不同 windows phone (41) - 8.0 相機和照片: 通過 AudioVideoCaptureDevice 捕獲視頻和音頻

作者：webabcd


介紹
與眾不同 windows phone 8.0 之 相機和照片

• 通過 AudioVideoCaptureDevice 捕獲視頻和音頻

示例
演示 AudioVideoCaptureDevice（wp8）的應用
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="錄像" 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）的應用
 * 
 * 關於 CaptureSource, FileSink（wp7）的應用參見
 * 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)
        {
            // 一些概述類的說明
            Summary();

            // 是否有后置攝像頭
            if (AudioVideoCaptureDevice.AvailableSensorLocations.Contains(CameraSensorLocation.Back))
            {
                // 獲取后置攝像頭攝像時的可用分辨率
                IReadOnlyList<Windows.Foundation.Size> supportedResolutions = AudioVideoCaptureDevice.GetAvailableCaptureResolutions(CameraSensorLocation.Back);
                Windows.Foundation.Size resolution = supportedResolutions[0];

                try
                {
                    // 讓后置攝像頭以指定的分辨率捕獲鏡頭內容
                    _captureDevice = await AudioVideoCaptureDevice.OpenAsync(CameraSensorLocation.Back, resolution);
                    // AudioVideoCaptureDevice.OpenForVideoOnlyAsync() - 僅捕獲視頻
                    // AudioVideoCaptureDevice.OpenForAudioOnlyAsync() - 僅捕獲音頻

                    // 錄像失敗時觸發的事件
                    _captureDevice.RecordingFailed += _captureDevice_RecordingFailed;


                    /*
                     * SetCaptureResolutionAsync() - 設置攝像的分辨率
                     * CaptureResolution - 獲取當前攝像的分辨率
                     * VideoEncodingFormat - 當前的視頻編碼格式
                     * AudioEncodingFormat - 當前的音頻編碼格式
                     * FocusRegion - 對焦區域
                     * SensorLocation - 當前攝像頭的位置（CameraSensorLocation 枚舉：Back 或 Front）
                     * SensorRotationInDegrees - 獲取攝像頭傳感器相對於屏幕的旋轉度數
                     * FocusAsync() - 自動對焦
                     * ResetFocusAsync() - 復位對焦
                     */


                    /*
                     * KnownCameraAudioVideoProperties 屬性集包括
                     *     VideoFrameRate - 每秒抓取的視頻幀數
                     *     H264EncodingProfile - H264 編碼的 profile（H264EncoderProfile 枚舉）
                     *     H264EncodingLevel - H264 編碼的 level（H264EncoderLevel 枚舉）
                     *     H264EnableKeyframes - 是否啟用關鍵幀
                     *     H264QuantizationParameter - QP 值，低的 QP 會保留大部分空間的詳細信息，從而達到最佳質量，高的 QP 會在一定程度上造成質量的損失，但能幫助編碼器實現較低的比特率
                     *     H264RequestDropNextNFrames - 指定編碼器應丟棄的幀數
                     *     H264RequestIdrFrame - 此屬性設置為 true 時，系統請求編碼流程進行瞬時解碼刷新(IDR)
                     *     UnmuteAudioWhileRecording - 此屬性設置為 true 時，能在記錄期間為音頻取消靜音
                     *     VideoTorchMode - 錄像時如何使用閃光燈（VideoTorchMode 枚舉：Off, Auto, On）
                     *     VideoTorchPower - 錄像時閃光燈的亮度，無單位且不同設備上的值不同
                     */
                    _captureDevice.SetProperty(KnownCameraAudioVideoProperties.H264EncodingProfile, H264EncoderProfile.Baseline);


                    /*
                     * KnownCameraGeneralProperties 屬性集包括
                     *     AutoFocusRange - 自動對焦的范圍（AutoFocusRange 枚舉，包括微距等）
                     *     EncodeWithOrientation - 視頻編碼時的旋轉角度，必須是 90 的倍數
                     *     SpecifiedCaptureOrientation -  元數據中的旋轉角度，必須是 90 的倍數
                     *     IsShutterSoundEnabledByUser - 用戶是否啟用了快門聲音，只讀
                     *     IsShutterSoundRequiredForRegion - 運行應用程序的區域是否需要快門聲音（有些區域為了保護隱私，要求照相或錄像必須要有快門聲音），只讀
                     *     PlayShutterSoundOnCapture - 指定捕獲時是否播放快門聲音
                     *     ManualFocusPosition - 手動對焦的位置
                     */
                    _captureDevice.SetProperty(KnownCameraGeneralProperties.AutoFocusRange, AutoFocusRange.Normal);
                    _captureDevice.SetProperty(KnownCameraGeneralProperties.EncodeWithOrientation, _captureDevice.SensorRotationInDegrees);


                    // 獲取指定屬性的值
                    // _captureDevice.GetProperty(KnownCameraGeneralProperties.IsShutterSoundEnabledByUser);

                    /*
                     * 獲取指定的范圍類屬性在當前攝像頭中所允許的值的范圍
                     */
                    // AudioVideoCaptureDevice.GetSupportedPropertyRange(CameraSensorLocation.Back, KnownCameraAudioVideoProperties.H264QuantizationParameter);

                    /*
                     * 獲取指定的值類屬性在當前攝像頭中所允許的值的列表
                     */
                    // AudioVideoCaptureDevice.GetSupportedPropertyValues(CameraSensorLocation.Back, KnownCameraAudioVideoProperties.H264EncodingProfile);

                    // 實時顯示捕獲的內容
                    videoBrush.SetSource(_captureDevice); // 擴展方法來自：Microsoft.Devices.CameraVideoBrushExtensions

                    rt.Angle = _captureDevice.SensorRotationInDegrees;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
            }
            else
            {
                MessageBox.Show("沒有后置攝像頭");
            }
        }

        // 錄像失敗
        void _captureDevice_RecordingFailed(AudioVideoCaptureDevice sender, CaptureFailedEventArgs args)
        {
            this.Dispatcher.BeginInvoke(delegate()
            {
                MessageBox.Show("error: " + args.ErrorCode.ToString());
            });
        }

        // 開始錄像
        private async void btnCapture_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                // 獲取應用程序數據存儲文件夾
                StorageFolder applicationFolder = ApplicationData.Current.LocalFolder;

                // 在指定的應用程序數據存儲文件夾內創建指定的文件
                StorageFile storageFile = await applicationFolder.CreateFileAsync("webabcdTest.mp4", CreationCollisionOption.ReplaceExisting);

                // 打開文件流，准備寫入錄像數據
                _stream = await storageFile.OpenAsync(FileAccessMode.ReadWrite);

                // 錄制視頻到指定的流
                await _captureDevice.StartRecordingToStreamAsync(_stream);

                btnCapture.IsEnabled = false;
                btnStop.IsEnabled = true;

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

        // 停止錄像
        private async void btnStop_Click(object sender, RoutedEventArgs e)
        {
            // 停止錄像
            await _captureDevice.StopRecordingAsync();
            _stream.Dispose();

            btnCapture.IsEnabled = true;
            btnStop.IsEnabled = false;
        }

        // 播放錄制的內容
        private void btnPlay_Click(object sender, RoutedEventArgs e)
        {
            // 啟動媒體播放器，播放錄制的內容
            MediaPlayerLauncher mediaPlayerLauncher = new MediaPlayerLauncher();

            // new Uri("webabcdTest.mp4", UriKind.Relative) 結合 MediaLocationType.Data，則系統會先在應用程序存儲的 Local 目錄下找，找不到再到 Local/IsolatedStorage 目錄下找
            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 = "";

            // 獲取電話上的可用攝像頭
            foreach (CameraSensorLocation csl in AudioVideoCaptureDevice.AvailableSensorLocations)
            {
                // Back 或 Front
                lblMsg.Text += "攝像頭：" + csl.ToString();
                lblMsg.Text += System.Environment.NewLine;


                // 攝像所支持的分辨率
                lblMsg.Text += "攝像的可用分辨率：";
                foreach (var size in AudioVideoCaptureDevice.GetAvailableCaptureResolutions(csl))
                {
                    lblMsg.Text += size.Width + "*" + size.Height + " ";
                }
                lblMsg.Text += System.Environment.NewLine;
                lblMsg.Text += System.Environment.NewLine;


                // 關於 CameraButtons 參見以前的文章：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 += "終端所支持的視頻編碼格式：";
            foreach (CameraCaptureVideoFormat format in AudioVideoCaptureDevice.SupportedVideoEncodingFormats)
            {
                lblMsg.Text += format.ToString() + " ";
            }
            lblMsg.Text += System.Environment.NewLine;


            lblMsg.Text += "終端所支持的音頻編碼格式：";
            foreach (CameraCaptureAudioFormat format in AudioVideoCaptureDevice.SupportedAudioEncodingFormats)
            {
                lblMsg.Text += format.ToString() + " ";
            }
            lblMsg.Text += System.Environment.NewLine;
        }
    }
}

OK
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