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rolfbjarnerolfbjarne
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Add new sample - AudioQueueOfflineRenderDemo
1 parent e53ee57 commit e0c7426

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-0
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‎AudioQueueOfflineRenderDemo/AppDelegate.cs

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices;
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using MonoTouch;
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using MonoTouch.AVFoundation;
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using MonoTouch.Foundation;
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using MonoTouch.UIKit;
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using MonoTouch.Dialog;
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using MonoTouch.AudioToolbox;
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using MonoTouch.AudioUnit;
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using MonoTouch.CoreFoundation;
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using AudioFileID = System.IntPtr;
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namespace AudioQueueOfflineRenderDemo
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{
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[Register ("AppDelegate")]
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public unsafe partial class AppDelegate : UIApplicationDelegate
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{
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UIWindow window;
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DialogViewController dvc;
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StyledStringElement element;
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bool busy;
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AVAudioPlayer player;
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public override bool FinishedLaunching (UIApplication app, NSDictionary options)
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{
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dvc = new DialogViewController (new RootElement ("Audio Queue Offline Render Demo") {
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new Section ("Audio Queue Offline Render Demo") {
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(element = new StyledStringElement ("Render audio", RenderAudioAsync) { Alignment = UITextAlignment.Center }),
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}
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});
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element.Alignment = UITextAlignment.Center;
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window = new UIWindow (UIScreen.MainScreen.Bounds);
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window.RootViewController = dvc;
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window.MakeKeyAndVisible ();
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return true;
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}
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void SetCaption (string caption)
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{
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BeginInvokeOnMainThread (() =>
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{
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element.Caption = caption;
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dvc.ReloadData ();
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});
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}
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void RenderAudioAsync ()
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{
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CFUrl sourceUrl = CFUrl.FromFile (NSBundle.MainBundle.PathForResource ("composeaudio", "mp3"));
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CFUrl destinationUrl = CFUrl.FromFile (System.IO.Path.Combine (System.Environment.GetFolderPath (Environment.SpecialFolder.Personal), "output.caf"));
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if (busy)
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return;
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busy = true;
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SetCaption ("Rendering...");
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var thread = new System.Threading.Thread (() =>
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{
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try {
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RenderAudio (sourceUrl, destinationUrl);
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} catch (Exception ex) {
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Console.WriteLine (ex);
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}
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BeginInvokeOnMainThread (() =>
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{
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SetCaption ("Playing...");
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using (var playUrl = new NSUrl (destinationUrl.Handle)) {
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player = AVAudioPlayer.FromUrl (playUrl);
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}
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player.Play ();
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player.FinishedPlaying += (sender, e) =>
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{
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BeginInvokeOnMainThread (() =>
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{
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player.Dispose ();
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player = null;
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SetCaption ("Render audio");
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busy = false;
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});
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};
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});
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});
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thread.IsBackground = true;
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thread.Start ();
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}
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static void CalculateBytesForTime (AudioStreamBasicDescription desc, int maxPacketSize, double seconds, out int bufferSize, out int packetCount)
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{
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const int maxBufferSize = 0x10000;
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const int minBufferSize = 0x4000;
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if (desc.FramesPerPacket > 0) {
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bufferSize = (int) (desc.SampleRate / desc.FramesPerPacket * seconds * maxPacketSize);
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} else {
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bufferSize = maxBufferSize > maxPacketSize ? maxBufferSize : maxPacketSize;
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}
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if (bufferSize > maxBufferSize && bufferSize > maxPacketSize) {
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bufferSize = maxBufferSize;
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} else if (bufferSize < minBufferSize) {
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bufferSize = minBufferSize;
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}
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packetCount = bufferSize / maxPacketSize;
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}
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unsafe static void HandleOutput (AudioFile audioFile, AudioQueue queue, AudioQueueBuffer *audioQueueBuffer, ref int packetsToRead, ref long currentPacket, ref bool done, ref bool flushed, ref AudioStreamPacketDescription [] packetDescriptions)
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{
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int bytes;
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int packets;
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if (done)
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return;
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packets = packetsToRead;
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bytes = (int) audioQueueBuffer->AudioDataBytesCapacity;
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packetDescriptions = audioFile.ReadPacketData (false, currentPacket, ref packets, audioQueueBuffer->AudioData, ref bytes);
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if (packets > 0) {
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audioQueueBuffer->AudioDataByteSize = (uint) bytes;
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queue.EnqueueBuffer (audioQueueBuffer, packetDescriptions);
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currentPacket += packets;
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} else {
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if (!flushed) {
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queue.Flush ();
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flushed = true;
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}
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queue.Stop (false);
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done = true;
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}
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}
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unsafe static void RenderAudio (CFUrl sourceUrl, CFUrl destinationUrl)
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{
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AudioStreamBasicDescription dataFormat;
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AudioQueueBuffer *buffer = null;
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long currentPacket = 0;
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int packetsToRead = 0;
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AudioStreamPacketDescription [] packetDescs = null;
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bool flushed = false;
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bool done = false;
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int bufferSize;
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using (var audioFile = AudioFile.Open (sourceUrl, AudioFilePermission.Read, (AudioFileType) 0)) {
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dataFormat = audioFile.StreamBasicDescription;
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using (var queue = new OutputAudioQueue (dataFormat, CFRunLoop.Current, CFRunLoop.CFRunLoopCommonModes)) {
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queue.OutputCompleted += (sender, e) =>
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{
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HandleOutput (audioFile, queue, buffer, ref packetsToRead, ref currentPacket, ref done, ref flushed, ref packetDescs);
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};
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// we need to calculate how many packets we read at a time and how big a buffer we need
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// we base this on the size of the packets in the file and an approximate duration for each buffer
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bool isVBR = dataFormat.BytesPerPacket == 0 || dataFormat.FramesPerPacket == 0;
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// first check to see what the max size of a packet is - if it is bigger
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// than our allocation default size, that needs to become larger
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// adjust buffer size to represent about a second of audio based on this format
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CalculateBytesForTime (dataFormat, audioFile.MaximumPacketSize, 1.0, out bufferSize, out packetsToRead);
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if (isVBR) {
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packetDescs = new AudioStreamPacketDescription [packetsToRead];
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} else {
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packetDescs = null; // we don't provide packet descriptions for constant bit rate formats (like linear PCM)
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}
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if (audioFile.MagicCookie.Length != 0)
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queue.MagicCookie = audioFile.MagicCookie;
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// allocate the input read buffer
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queue.AllocateBuffer (bufferSize, out buffer);
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// prepare the capture format
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AudioStreamBasicDescription captureFormat;
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captureFormat.SampleRate = dataFormat.SampleRate;
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captureFormat.Format = AudioFormatType.LinearPCM;
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captureFormat.FormatFlags = AudioFormatFlags.IsSignedInteger | AudioFormatFlags.IsPacked |
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(AudioFormatFlags) (24 << (int) AudioFormatFlags.LinearPCMSampleFractionShift);
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captureFormat.ChannelsPerFrame = dataFormat.ChannelsPerFrame;
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captureFormat.FramesPerPacket = 1;
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captureFormat.BitsPerChannel = 32;
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captureFormat.BytesPerPacket = dataFormat.ChannelsPerFrame * 4;
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captureFormat.BytesPerFrame = captureFormat.BytesPerPacket;
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queue.SetOfflineRenderFormat (captureFormat, audioFile.ChannelLayout);
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// prepare the target format
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AudioStreamBasicDescription dstFormat;
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dstFormat.SampleRate = dataFormat.SampleRate;
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dstFormat.ChannelsPerFrame = dataFormat.ChannelsPerFrame;
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dstFormat.Format = AudioFormatType.LinearPCM;
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dstFormat.FormatFlags = AudioFormatFlags.IsPacked | AudioFormatFlags.LinearPCMIsSignedInteger;
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dstFormat.BitsPerChannel = 16;
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dstFormat.BytesPerPacket = 2 * dstFormat.ChannelsPerFrame;
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dstFormat.BytesPerFrame = dstFormat.BytesPerPacket;
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dstFormat.FramesPerPacket = 1;
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using (var captureFile = ExtAudioFile.CreateWithUrl (destinationUrl, AudioFileType.CAF, dstFormat, AudioFileFlags.EraseFlags)) {
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captureFile.ClientDataFormat = captureFormat;
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int captureBufferSize = bufferSize / 2;
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var captureABL = new AudioBufferList (1);
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AudioQueueBuffer *captureBuffer;
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queue.AllocateBuffer (captureBufferSize, out captureBuffer);
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captureABL.Buffers [0].Data = captureBuffer->AudioData;
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captureABL.Buffers [0].NumberChannels = captureFormat.ChannelsPerFrame;
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queue.Start ();
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double ts = 0;
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queue.RenderOffline (ts, captureBuffer, 0);
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HandleOutput (audioFile, queue, buffer, ref packetsToRead, ref currentPacket, ref done, ref flushed, ref packetDescs);
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while (true) {
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int reqFrames = captureBufferSize / captureFormat.BytesPerFrame;
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queue.RenderOffline (ts, captureBuffer, reqFrames);
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captureABL.Buffers [0].Data = captureBuffer->AudioData;
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captureABL.Buffers [0].DataByteSize = (int) captureBuffer->AudioDataByteSize;
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int writeFrames = captureABL.Buffers [0].DataByteSize / captureFormat.BytesPerFrame;
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// Console.WriteLine ("ts: {0} AudioQueueOfflineRender: req {1} frames / {2} bytes, got {3} frames / {4} bytes",
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// ts, reqFrames, captureBufferSize, writeFrames, captureABL.Buffers [0].DataByteSize);
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captureFile.WriteAsync (writeFrames, captureABL);
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if (flushed)
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break;
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ts += writeFrames;
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}
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CFRunLoop.Current.RunInMode (CFRunLoop.CFDefaultRunLoopMode, 1, false);
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}
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}
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}
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}
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}
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}
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‎AudioQueueOfflineRenderDemo/AudioQueueOfflineRenderDemo.csproj

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<?xml version="1.0" encoding="utf-8"?>
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<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">iPhoneSimulator</Platform>
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<ProductVersion>10.0.0</ProductVersion>
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<SchemaVersion>2.0</SchemaVersion>
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<ProjectGuid>{8D016236-ED61-445E-A11F-31DE286E1AAD}</ProjectGuid>
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<ProjectTypeGuids>{6BC8ED88-2882-458C-8E55-DFD12B67127B};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
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<OutputType>Exe</OutputType>
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<RootNamespace>AudioQueueOfflineRenderDemo</RootNamespace>
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<AssemblyName>AudioQueueOfflineRenderDemo</AssemblyName>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhoneSimulator' ">
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\iPhoneSimulator\Debug</OutputPath>
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<DefineConstants>DEBUG;</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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<ConsolePause>false</ConsolePause>
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<MtouchDebug>true</MtouchDebug>
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<MtouchProfiling>true</MtouchProfiling>
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<MtouchLink>None</MtouchLink>
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<MtouchI18n />
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<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
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<EnvironmentVariables>
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<EnvironmentVariables>
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<Variable name="MONO_LOG_LEVEL" value="debug" />
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<Variable name="MONO_LOG_MASK" value="dll" />
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</EnvironmentVariables>
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</EnvironmentVariables>
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<CrashReportingApiKey />
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhoneSimulator' ">
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<DebugType>none</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\iPhoneSimulator\Release</OutputPath>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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<ConsolePause>false</ConsolePause>
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<MtouchLink>None</MtouchLink>
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<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhone' ">
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\iPhone\Debug</OutputPath>
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<DefineConstants>DEBUG;</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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<ConsolePause>false</ConsolePause>
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<CodesignKey>iPhone Developer</CodesignKey>
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<MtouchDebug>true</MtouchDebug>
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<MtouchProfiling>true</MtouchProfiling>
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<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
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<CrashReportingApiKey />
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<MtouchExtraArgs>-v -v -v</MtouchExtraArgs>
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<MtouchI18n />
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<IpaPackageName />
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhone' ">
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<DebugType>none</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\iPhone\Release</OutputPath>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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<ConsolePause>false</ConsolePause>
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<CodesignKey>iPhone Developer</CodesignKey>
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<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Ad-Hoc|iPhone' ">
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<DebugType>none</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\iPhone\Ad-Hoc</OutputPath>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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<ConsolePause>false</ConsolePause>
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<BuildIpa>true</BuildIpa>
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<CodesignKey>iPhone Distribution</CodesignKey>
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<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'AppStore|iPhone' ">
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<DebugType>none</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\iPhone\AppStore</OutputPath>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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<ConsolePause>false</ConsolePause>
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<CodesignKey>iPhone Distribution</CodesignKey>
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<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="System.Xml" />
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<Reference Include="System.Core" />
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<Reference Include="monotouch" />
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<Reference Include="MonoTouch.Dialog-1" />
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</ItemGroup>
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<ItemGroup>
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<None Include="Info.plist" />
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<None Include="README.md" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="Main.cs" />
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<Compile Include="AppDelegate.cs" />
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</ItemGroup>
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<Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
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<ItemGroup>
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<Content Include="composeaudio.mp3" />
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<Content Include="icons\114_icon.png" />
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<Content Include="icons\144_icon.png" />
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<Content Include="icons\29_icon.png" />
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<Content Include="icons\50_icon.png" />
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<Content Include="icons\57_icon.png" />
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<Content Include="icons\58_icon.png" />
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<Content Include="icons\72_icon.png" />
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</ItemGroup>
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<ItemGroup>
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<Folder Include="icons\" />
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</ItemGroup>
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</Project>

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