如何在 iOS 中导出具有效果的音频文件答案

【问题标题】：How to Export an audio file with effect in iOS如何在 iOS 中导出具有效果的音频文件
【发布时间】：2015-06-10 04:05:50
【问题描述】：

我使用了 AVAudioEngine 来播放多音频文件。我想在不录制的情况下导出这个声音（包括效果和正在播放的多个文件）。

我该怎么做？

这是我使用 AVAudioEngine 的代码

//1. Create engine
_audioEngine  = [[AVAudioEngine alloc] init];

//2. Create player nodes , unit
_mainPlayer = [[AVAudioPlayerNode alloc] init];
_aPlayer = [[AVAudioPlayerNode alloc] init];
_bPlayer = [[AVAudioPlayerNode alloc] init];

_effectTimePitch = [[AVAudioUnitTimePitch alloc] init];
AVAudioMixerNode *mixerNode = [[AVAudioMixerNode alloc] init];

//3. Attach node to engine
[_audioEngine attachNode:_mainPlayer];
[_audioEngine attachNode:_aPlayer];
[_audioEngine attachNode:_bPlayer];
[_audioEngine attachNode:mixerNode];
[_audioEngine attachNode:_effectTimePitch];

//4. Connect player node to engine's main mixer
NSDictionary *setting = @{
                          AVFormatIDKey: @(AVAudioPCMFormatFloat32),
                          AVSampleRateKey: @(1),
                          AVNumberOfChannelsKey: @(1)
                          };
_audioFormat = [[AVAudioFormat alloc] initWithSettings:setting];

[_audioEngine connect:_mainPlayer to:mixerNode format:_audioFormat];
[_audioEngine connect:_aPlayer to:mixerNode format:_audioFormat];
[_audioEngine connect:_bPlayer to:mixerNode format:_audioFormat];
[_audioEngine connect:mixerNode to:_effectTimePitch format:_audioFormat];
[_audioEngine connect:_effectTimePitch to:_audioEngine.mainMixerNode format:_audioFormat];

//5. Start engine
NSError *error;
NSAssert([_audioEngine startAndReturnError:&error], @"couldn't start engine, %@", [error localizedDescription]);

//6 Play Audio
AVAudioFile *audioFile = [[AVAudioFile alloc] initForReading: _mainURL error: nil];
[_mainPlayer scheduleFile:audioFile atTime:nil completionHandler:nil];
AVAudioFile *aFile = [[AVAudioFile alloc] initForReading: _mainURL error: nil];
[_aPlayer scheduleFile:aFile atTime:nil completionHandler:nil];
AVAudioFile *bFile = [[AVAudioFile alloc] initForReading: _mainURL error: nil];
[_bPlayer scheduleFile:bFile atTime:nil completionHandler:nil];

[_mainPlayer play];
[_aPlayer play];
[_bPlayer play];

【问题讨论】：

标签： ios audio avaudioengine

【解决方案1】：

您必须设置一个 AVAudioFile 才能写入。然后，您在链中的某个后期点（例如您的最后一个效果节点）安装一个水龙头，并从该缓冲区写入输出文件。

【讨论】：