正如您从代码中看到的那样，在我的回调中，我提取了音频数据并将其放入 NSData 数据中，然后将其发送到另一个类以将其上传到服务器。这一切都有效，这意味着服务器接收并播放音频数据。但是，缓冲区之间会发出咔哒声或敲击声。我希望有人可以告诉我是什么原因造成的以及如何解决它。我已经阅读了其他相关的帖子，但是它们似乎都指的是只使用 1 个缓冲区，并且添加更多是解决方法，但我使用的是 3 个缓冲区并尝试调整没有修复它的数字
AQRecorder.mm
#include "AQRecorder.h"
RestClient * restClient;
NSData* data;
// ____________________________________________________________________________________
// Determine the size, in bytes, of a buffer necessary to represent the supplied number
// of seconds of audio data.
int AQRecorder::ComputeRecordBufferSize(const AudioStreamBasicDescription *format, float seconds)
{
int packets, frames, bytes = 0;
try {
frames = (int)ceil(seconds * format->mSampleRate);
if (format->mBytesPerFrame > 0)
bytes = frames * format->mBytesPerFrame;
else {
UInt32 maxPacketSize;
if (format->mBytesPerPacket > 0)
maxPacketSize = format->mBytesPerPacket; // constant packet size
else {
UInt32 propertySize = sizeof(maxPacketSize);
XThrowIfError(AudioQueueGetProperty(mQueue, kAudioQueueProperty_MaximumOutputPacketSize, &maxPacketSize,
&propertySize), "couldn't get queue's maximum output packet size");
}
if (format->mFramesPerPacket > 0)
packets = frames / format->mFramesPerPacket;
else
packets = frames; // worst-case scenario: 1 frame in a packet
if (packets == 0) // sanity check
packets = 1;
bytes = packets * maxPacketSize;
}
} catch (CAXException e) {
char buf[256];
fprintf(stderr, "Error: %s (%s)\n", e.mOperation, e.FormatError(buf));
return 0;
}
return bytes;
}
// ____________________________________________________________________________________
// AudioQueue callback function, called when an input buffers has been filled.
void AQRecorder::MyInputBufferHandler( void * inUserData,
AudioQueueRef inAQ,
AudioQueueBufferRef inBuffer,
const AudioTimeStamp * inStartTime,
UInt32 inNumPackets,
const AudioStreamPacketDescription* inPacketDesc)
{
AQRecorder *aqr = (AQRecorder *)inUserData;
try {
if (inNumPackets > 0) {
// write packets to file
// XThrowIfError(AudioFileWritePackets(aqr->mRecordFile, FALSE, inBuffer->mAudioDataByteSize,
// inPacketDesc, aqr->mRecordPacket, &inNumPackets, inBuffer->mAudioData),
// "AudioFileWritePackets failed");
aqr->mRecordPacket += inNumPackets;
// int numBytes = inBuffer->mAudioDataByteSize;
// SInt8 *testBuffer = (SInt8*)inBuffer->mAudioData;
//
// for (int i=0; i < numBytes; i++)
// {
// SInt8 currentData = testBuffer[i];
// printf("Current data in testbuffer is %d", currentData);
//
// NSData * temp = [NSData dataWithBytes:currentData length:sizeof(currentData)];
// }
data=[[NSData dataWithBytes:inBuffer->mAudioData length:inBuffer->mAudioDataByteSize]retain];
[restClient uploadAudioData:data url:nil];
}
// if we're not stopping, re-enqueue the buffer so that it gets filled again
if (aqr->IsRunning())
XThrowIfError(AudioQueueEnqueueBuffer(inAQ, inBuffer, 0, NULL), "AudioQueueEnqueueBuffer failed");
} catch (CAXException e) {
char buf[256];
fprintf(stderr, "Error: %s (%s)\n", e.mOperation, e.FormatError(buf));
}
}
AQRecorder::AQRecorder()
{
mIsRunning = false;
mRecordPacket = 0;
data = [[NSData alloc]init];
restClient = [[RestClient sharedManager]retain];
}
AQRecorder::~AQRecorder()
{
AudioQueueDispose(mQueue, TRUE);
AudioFileClose(mRecordFile);
if (mFileName){
CFRelease(mFileName);
}
[restClient release];
[data release];
}
// ____________________________________________________________________________________
// Copy a queue's encoder's magic cookie to an audio file.
void AQRecorder::CopyEncoderCookieToFile()
{
UInt32 propertySize;
// get the magic cookie, if any, from the converter
OSStatus err = AudioQueueGetPropertySize(mQueue, kAudioQueueProperty_MagicCookie, &propertySize);
// we can get a noErr result and also a propertySize == 0
// -- if the file format does support magic cookies, but this file doesn't have one.
if (err == noErr && propertySize > 0) {
Byte *magicCookie = new Byte[propertySize];
UInt32 magicCookieSize;
XThrowIfError(AudioQueueGetProperty(mQueue, kAudioQueueProperty_MagicCookie, magicCookie, &propertySize), "get audio converter's magic cookie");
magicCookieSize = propertySize; // the converter lies and tell us the wrong size
// now set the magic cookie on the output file
UInt32 willEatTheCookie = false;
// the converter wants to give us one; will the file take it?
err = AudioFileGetPropertyInfo(mRecordFile, kAudioFilePropertyMagicCookieData, NULL, &willEatTheCookie);
if (err == noErr && willEatTheCookie) {
err = AudioFileSetProperty(mRecordFile, kAudioFilePropertyMagicCookieData, magicCookieSize, magicCookie);
XThrowIfError(err, "set audio file's magic cookie");
}
delete[] magicCookie;
}
}
void AQRecorder::SetupAudioFormat(UInt32 inFormatID)
{
memset(&mRecordFormat, 0, sizeof(mRecordFormat));
UInt32 size = sizeof(mRecordFormat.mSampleRate);
XThrowIfError(AudioSessionGetProperty( kAudioSessionProperty_CurrentHardwareSampleRate,
&size,
&mRecordFormat.mSampleRate), "couldn't get hardware sample rate");
//override samplearate to 8k from device sample rate
mRecordFormat.mSampleRate = 8000.0;
size = sizeof(mRecordFormat.mChannelsPerFrame);
XThrowIfError(AudioSessionGetProperty( kAudioSessionProperty_CurrentHardwareInputNumberChannels,
&size,
&mRecordFormat.mChannelsPerFrame), "couldn't get input channel count");
// mRecordFormat.mChannelsPerFrame = 1;
mRecordFormat.mFormatID = inFormatID;
if (inFormatID == kAudioFormatLinearPCM)
{
// if we want pcm, default to signed 16-bit little-endian
mRecordFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;
mRecordFormat.mBitsPerChannel = 16;
mRecordFormat.mBytesPerPacket = mRecordFormat.mBytesPerFrame = (mRecordFormat.mBitsPerChannel / 8) * mRecordFormat.mChannelsPerFrame;
mRecordFormat.mFramesPerPacket = 1;
}
if (inFormatID == kAudioFormatULaw) {
NSLog(@"is ulaw");
mRecordFormat.mSampleRate = 8000.0;
mRecordFormat.mFormatFlags = 0;
mRecordFormat.mFramesPerPacket = 1;
mRecordFormat.mChannelsPerFrame = 1;
mRecordFormat.mBitsPerChannel = 8;
mRecordFormat.mBytesPerPacket = 1;
mRecordFormat.mBytesPerFrame = 1;
}
}
NSString * GetDocumentDirectory(void)
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
return basePath;
}
void AQRecorder::StartRecord(CFStringRef inRecordFile)
{
int i, bufferByteSize;
UInt32 size;
CFURLRef url;
try {
mFileName = CFStringCreateCopy(kCFAllocatorDefault, inRecordFile);
// specify the recording format
SetupAudioFormat(kAudioFormatULaw /*kAudioFormatLinearPCM*/);
// create the queue
XThrowIfError(AudioQueueNewInput(
&mRecordFormat,
MyInputBufferHandler,
this /* userData */,
NULL /* run loop */, NULL /* run loop mode */,
0 /* flags */, &mQueue), "AudioQueueNewInput failed");
// get the record format back from the queue's audio converter --
// the file may require a more specific stream description than was necessary to create the encoder.
mRecordPacket = 0;
size = sizeof(mRecordFormat);
XThrowIfError(AudioQueueGetProperty(mQueue, kAudioQueueProperty_StreamDescription,
&mRecordFormat, &size), "couldn't get queue's format");
NSString *basePath = GetDocumentDirectory();
NSString *recordFile = [basePath /*NSTemporaryDirectory()*/ stringByAppendingPathComponent: (NSString*)inRecordFile];
url = CFURLCreateWithString(kCFAllocatorDefault, (CFStringRef)recordFile, NULL);
// create the audio file
XThrowIfError(AudioFileCreateWithURL(url, kAudioFileCAFType, &mRecordFormat, kAudioFileFlags_EraseFile,
&mRecordFile), "AudioFileCreateWithURL failed");
CFRelease(url);
// copy the cookie first to give the file object as much info as we can about the data going in
// not necessary for pcm, but required for some compressed audio
CopyEncoderCookieToFile();
// allocate and enqueue buffers
bufferByteSize = ComputeRecordBufferSize(&mRecordFormat, kBufferDurationSeconds); // enough bytes for half a second
for (i = 0; i < kNumberRecordBuffers; ++i) {
XThrowIfError(AudioQueueAllocateBuffer(mQueue, bufferByteSize, &mBuffers[i]),
"AudioQueueAllocateBuffer failed");
XThrowIfError(AudioQueueEnqueueBuffer(mQueue, mBuffers[i], 0, NULL),
"AudioQueueEnqueueBuffer failed");
}
// start the queue
mIsRunning = true;
XThrowIfError(AudioQueueStart(mQueue, NULL), "AudioQueueStart failed");
}
catch (CAXException &e) {
char buf[256];
fprintf(stderr, "Error: %s (%s)\n", e.mOperation, e.FormatError(buf));
}
catch (...) {
fprintf(stderr, "An unknown error occurred\n");
}
}
void AQRecorder::StopRecord()
{
// end recording
mIsRunning = false;
// XThrowIfError(AudioQueueReset(mQueue), "AudioQueueStop failed");
XThrowIfError(AudioQueueStop(mQueue, true), "AudioQueueStop failed");
// a codec may update its cookie at the end of an encoding session, so reapply it to the file now
CopyEncoderCookieToFile();
if (mFileName)
{
CFRelease(mFileName);
mFileName = NULL;
}
AudioQueueDispose(mQueue, true);
AudioFileClose(mRecordFile);
}