我会尽可能地做到这一点。我会用我的音频队列录制声音。我有一个项目并添加了我的项目所需的所有框架（所以这不是问题）。我只更改了 2 个文件：
- 视图控制器.h
- 视图控制器.m
开始之前：我不确定文件类型（void）或（IBAction）（我无法测试）。
这是我的ViewController.h的源代码
#import <UIKit/UIKit.h>
//#import <AudioToolbox/AudioQueue.h> //(don't know to use that)
//#import <AudioToolbox/AudioFile.h> //(don't know to use that)
#import <AudioUnit/AudioUnit.h>
#import <AudioToolbox/AudioToolbox.h>
#define NUM_BUFFERS 3
#define SECONDS_TO_RECORD 10
typedef struct
{
AudioStreamBasicDescription dataFormat;
AudioQueueRef queue;
AudioQueueBufferRef buffers[NUM_BUFFERS];
AudioFileID audioFile;
SInt64 currentPacket;
bool recording;
} RecordState;
typedef struct
{
AudioStreamBasicDescription dataFormat;
AudioQueueRef queue;
AudioQueueBufferRef buffers[NUM_BUFFERS];
AudioFileID audioFile;
SInt64 currentPacket;
bool playing;
} PlayState;
@interface ViewController : UIViewController{
IBOutlet UILabel* labelStatus;
IBOutlet UIButton* buttonRecord;
IBOutlet UIButton* buttonPlay;
RecordState recordState;
PlayState playState;
CFURLRef fileURL;
}
- (BOOL)getFilename:(char*)buffer maxLenth:(int)maxBufferLength;
- (void)setupAudioFormat:(AudioStreamBasicDescription*)format;
- (void)recordPressed:(id)sender;
- (void)playPressed:(id)sender;
- (IBAction)startRecording;
- (IBAction)stopRecording;
- (IBAction)startPlayback;
- (IBAction)stopPlayback;
这是我的ViewController.m的源代码
（我在功能 startPlayback 评论中有错误）
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
void AudioInputCallback(
void *inUserData,
AudioQueueRef inAQ,
AudioQueueBufferRef inBuffer,
const AudioTimeStamp *inStartTime,
UInt32 inNumberPacketDescriptions,
const AudioStreamPacketDescription *inPacketDescs)
{
RecordState* recordState = (RecordState*)inUserData;
if(!recordState->recording)
{
printf("Not recording, returning\n");
}
//if(inNumberPacketDescriptions == 0 && recordState->dataFormat.mBytesPerPacket != 0)
//{
// inNumberPacketDescriptions = inBuffer->mAudioDataByteSize / recordState->dataFormat.mBytesPerPacket;
//}
printf("Writing buffer %lld\n", recordState->currentPacket);
OSStatus status = AudioFileWritePackets(recordState->audioFile,
false,
inBuffer->mAudioDataByteSize,
inPacketDescs,
recordState->currentPacket,
&inNumberPacketDescriptions,
inBuffer->mAudioData);
if(status == 0)
{
recordState->currentPacket += inNumberPacketDescriptions;
}
AudioQueueEnqueueBuffer(recordState->queue, inBuffer, 0, NULL);
}
void AudioOutputCallback(
void* inUserData,
AudioQueueRef outAQ,
AudioQueueBufferRef outBuffer)
{
PlayState* playState = (PlayState*)inUserData;
if(!playState->playing)
{
printf("Not playing, returning\n");
return;
}
printf("Queuing buffer %lld for playback\n", playState->currentPacket);
AudioStreamPacketDescription* packetDescs = NULL;
UInt32 bytesRead;
UInt32 numPackets = 8000;
OSStatus status;
status = AudioFileReadPackets(
playState->audioFile,
false,
&bytesRead,
packetDescs,
playState->currentPacket,
&numPackets,
outBuffer->mAudioData);
if(numPackets)
{
outBuffer->mAudioDataByteSize = bytesRead;
status = AudioQueueEnqueueBuffer(
playState->queue,
outBuffer,
0,
packetDescs);
playState->currentPacket += numPackets;
}
else
{
if(playState->playing)
{
AudioQueueStop(playState->queue, false);
AudioFileClose(playState->audioFile);
playState->playing = false;
}
AudioQueueFreeBuffer(playState->queue, outBuffer);
}
}
- (void)setupAudioFormat:(AudioStreamBasicDescription*)format
{
format->mSampleRate = 8000.0;
format->mFormatID = kAudioFormatLinearPCM;
format->mFramesPerPacket = 1;
format->mChannelsPerFrame = 1;
format->mBytesPerFrame = 2;
format->mBytesPerPacket = 2;
format->mBitsPerChannel = 16;
format->mReserved = 0;
format->mFormatFlags = kLinearPCMFormatFlagIsBigEndian |
kLinearPCMFormatFlagIsSignedInteger |
kLinearPCMFormatFlagIsPacked;
}
- (void)recordPressed:(id)sender
{
if(!playState.playing)
{
if(!recordState.recording)
{
printf("Starting recording\n");
[self startRecording];
}
else
{
printf("Stopping recording\n");
[self stopRecording];
}
}
else
{
printf("Can't start recording, currently playing\n");
}
}
- (void)playPressed:(id)sender
{
if(!recordState.recording)
{
if(!playState.playing)
{
printf("Starting playback\n");
[self startPlayback];
}
else
{
printf("Stopping playback\n");
[self stopPlayback];
}
}
}
- (IBAction)startRecording
{
[self setupAudioFormat:&recordState.dataFormat];
recordState.currentPacket = 0;
OSStatus status;
status = AudioQueueNewInput(&recordState.dataFormat,
AudioInputCallback,
&recordState,
CFRunLoopGetCurrent(),
kCFRunLoopCommonModes,
0,
&recordState.queue);
if(status == 0)
{
for(int i = 0; i < NUM_BUFFERS; i++)
{
AudioQueueAllocateBuffer(recordState.queue,
16000, &recordState.buffers[i]);
AudioQueueEnqueueBuffer(recordState.queue,
recordState.buffers[i], 0, NULL);
}
status = AudioFileCreateWithURL(fileURL,
kAudioFileAIFFType,
&recordState.dataFormat,
kAudioFileFlags_EraseFile,
&recordState.audioFile);
if(status == 0)
{
recordState.recording = true;
status = AudioQueueStart(recordState.queue, NULL);
if(status == 0)
{
labelStatus.text = @"Recording";
}
}
}
if(status != 0)
{
[self stopRecording];
labelStatus.text = @"Record Failed";
}
}
- (IBAction)stopRecording
{
recordState.recording = false;
AudioQueueStop(recordState.queue, true);
for(int i = 0; i < NUM_BUFFERS; i++)
{
AudioQueueFreeBuffer(recordState.queue,
recordState.buffers[i]);
}
AudioQueueDispose(recordState.queue, true);
AudioFileClose(recordState.audioFile);
labelStatus.text = @"Idle";
}
- (IBAction)startPlayback
{
playState.currentPacket = 0;
[self setupAudioFormat:&playState.dataFormat];
OSStatus status;
// I get here an error
// Use of undeclared identifier 'fsRdPerm'
// How to fix that?
status = AudioFileOpenURL(fileURL, fsRdPerm, kAudioFileAIFFType, &playState.audioFile);
if(status == 0)
{
status = AudioQueueNewOutput(
&playState.dataFormat,
AudioOutputCallback,
&playState,
CFRunLoopGetCurrent(),
kCFRunLoopCommonModes,
0,
&playState.queue);
if(status == 0)
{
playState.playing = true;
for(int i = 0; i < NUM_BUFFERS && playState.playing; i++)
{
if(playState.playing)
{
AudioQueueAllocateBuffer(playState.queue, 16000, &playState.buffers[i]);
AudioOutputCallback(&playState, playState.queue, playState.buffers[i]);
}
}
if(playState.playing)
{
status = AudioQueueStart(playState.queue, NULL);
if(status == 0)
{
labelStatus.text = @"Playing";
}
}
}
}
if(status != 0)
{
[self stopPlayback];
labelStatus.text = @"Play failed";
}
}
- (void)stopPlayback
{
playState.playing = false;
for(int i = 0; i < NUM_BUFFERS; i++)
{
AudioQueueFreeBuffer(playState.queue, playState.buffers[i]);
}
AudioQueueDispose(playState.queue, true);
AudioFileClose(playState.audioFile);
}
- (BOOL)getFilename:(char*)buffer maxLenth:(int)maxBufferLength
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString* docDir = [paths objectAtIndex:0];
NSString* file = [docDir stringByAppendingString:@"/recording.aif"];
return [file getCString:buffer maxLength:maxBufferLength encoding:NSUTF8StringEncoding];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
我不知道如何解决这个问题，我可以使用我的项目。如果我将功能 startPlayback 注释掉，我会收到此错误：
ld /Users/NAME/Library/Developer/Xcode/DerivedData/recorder_test2-gehymgoneospsldgfpxnbjdapebu/Build/Products/Debug-iphonesimulator/recorder_test2.app/recorder_test2 normal i386 cd /Users/NAME/Desktop/recorder_test2 setenv IPHONEOS_DEPLOYMENT_TARGET 6.0 setenv PATH "/Applications /Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/ sbin" /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/ iPhone模拟器6.0。sdk -L/Users/NAME/Library/Developer/Xcode/DerivedData/recorder_test2-gehymgoneospsldgfpxnbjdapebu/Build/Products/Debug-iphonesimulator -F/Users/NAME/Library/Developer/Xcode/DerivedData/recorder_test2-gehymgoneospsldgfpxnbjdapebu/Build/Products/ Debug-iphonesimulator -filelist /Users/NAME/Library/Developer/Xcode/DerivedData/recorder_test2-gehymgoneospsldgfpxnbjdapebu/Build/Intermediates/recorder_test2.build/Debug-iphonesimulator/recorder_test2.build/Objects-normal/i386/recorder_test2.LinkFileList -Xlinker - objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=6。0 -framework AudioToolbox -framework AudioUnit -framework CoreAudio -framework UIKit -framework Foundation -framework CoreGraphics -o /Users/NAME/Library/Developer/Xcode/DerivedData/recorder_test2-gehymgoneospsldgfpxnbjdapebu/Build/Products/Debug-iphonesimulator/recorder_test2.app/记录器_test2
ld：找不到框架 AudioUnit clang：错误：链接器命令失败，退出代码为 1（使用 -v 查看调用）
请使用这两个源文件并自己测试并帮助我。
