最近，我的项目想通过AAC实现音频通信，所以我使用了AudioQueue，但是有一个问题，我的播放器的回调函数不起作用，在我的项目中回调函数已经工作了3次。 也就是说for函数工作 3 次。 当活动AudioQueueStart(mQueue, NULL)时，回调函数永远不会被调用。
我用两部iPhone来运行。 它们通过UDP套接字连接，我相信这部分很好。 我可以得到正确的音频数据。
我修改了一个演示，它是播放文件数据而不是内存。 所以我不知道这是不是有问题？
这是我的代码：AQPlayer.h
#include <AudioToolbox/AudioToolbox.h>
#include "CAStreamBasicDescription.h"
#include "CAXException.h"
#define kNumberBuffers 3
#define kBufferDurationSeconds 0.5
class AQPlayer
{
public:
AQPlayer();
~AQPlayer();
OSStatus StartQueue(BOOL inResume);
OSStatus StopQueue();
OSStatus PauseQueue();
AudioQueueRef Queue() { return mQueue; }
CAStreamBasicDescription DataFormat() const { return mDataFormat; }
Boolean IsRunning() const { return (mIsRunning) ? true : false; }
Boolean IsInitialized() const { return mIsInitialized; }
CFStringRef GetFilePath() const { return (mFilePath) ? mFilePath : CFSTR(""); }
Boolean IsLooping() const { return mIsLooping; }
void SetLooping(Boolean inIsLooping) { mIsLooping = inIsLooping; }
void CreateQueueForFile(CFStringRef inFilePath);
void DisposeQueue(Boolean inDisposeFile);
void prepareAudioQueue();
void start();
void stop();
private:
UInt32 GetNumPacketsToRead() { return mNumPacketsToRead; }
SInt64 GetCurrentPacket() { return mCurrentPacket; }
AudioFileID GetAudioFileID() { return mAudioFile; }
void SetCurrentPacket(SInt64 inPacket) { mCurrentPacket = inPacket; }
void SetupNewQueue();
AudioQueueRef mQueue;
AudioQueueBufferRef mBuffers[kNumberBuffers];
AudioFileID mAudioFile;
CFStringRef mFilePath;
CAStreamBasicDescription mDataFormat;
Boolean mIsInitialized;
UInt32 mNumPacketsToRead;
SInt64 mCurrentPacket;
UInt32 mIsRunning;
Boolean mIsDone;
Boolean mIsLooping;
static void isRunningProc( void * inUserData,
AudioQueueRef inAQ,
AudioQueuePropertyID inID);
static void AQBufferCallback( void * inUserData,
AudioQueueRef inAQ,
AudioQueueBufferRef inCompleteAQBuffer);
void CalculateBytesForTime( CAStreamBasicDescription & inDesc,
UInt32 inMaxPacketSize,
Float64 inSeconds,
UInt32 *outBufferSize,
UInt32 *outNumPackets);
};
这是AQPlayer.mm
#include "package.h"
#include "udpsocket.h"
#define MAXPACKETSIZE 1000
#define BUFFER_SIZE 4000
#include "AQPlayer.h"
extern udpsocket *udp;
void AQPlayer::AQBufferCallback(void * inUserData,
AudioQueueRef inAQ,
AudioQueueBufferRef inCompleteAQBuffer)
{
AQPlayer *THIS = (AQPlayer *)inUserData;
dispatch_semaphore_wait(udp->sempahore,DISPATCH_TIME_FOREVER);
NSLog(@"read begin");
while ([udp->AudioQueue count]>0 &&
![[udp->AudioQueue objectAtIndex:0] isKindOfClass:[AUDIO_CACHE_OBJECT class]])
{
[udp->AudioQueue removeObjectAtIndex:0];
}
if([udp->AudioQueue count]<1){
[NSThread sleepForTimeInterval:0.05];
AQBufferCallback(inUserData, inAQ, inCompleteAQBuffer);
return;
}
int packets = 0;
int dataLen = 0;
AUDIO_CACHE_OBJECT *pack;
char *data = (char*)malloc(sizeof(char)*BUFFER_SIZE);;
memset(data, 0, BUFFER_SIZE);
pack = [udp->AudioQueue firstObject];
while (dataLen+pack.datalen<BUFFER_SIZE && [udp->AudioQueue count]>0 /*&& packets<21*/) {
memcpy(data+dataLen, [pack GetData], [pack datalen]);
dataLen+=[pack datalen];
[udp->AudioQueue removeObjectAtIndex:0];
// [pack memset];
packets ++;
while ([udp->AudioQueue count]>1 &&
![[udp->AudioQueue objectAtIndex:0] isKindOfClass:[AUDIO_CACHE_OBJECT class]])
{
[udp->AudioQueue removeObjectAtIndex:0];
}
if([udp->AudioQueue count]<1){
break;
}
pack = [udp->AudioQueue firstObject];
}
memcpy(inCompleteAQBuffer->mAudioData, data, dataLen);
inCompleteAQBuffer->mAudioDataByteSize = dataLen;
inCompleteAQBuffer->mPacketDescriptionCount = packets;
AudioQueueEnqueueBuffer(inAQ, inCompleteAQBuffer, 0,NULL);
THIS->mCurrentPacket += packets;
free(data);
NSLog(@"read end --- %lld",THIS->mCurrentPacket);
}
void AQPlayer::isRunningProc ( void * inUserData,
AudioQueueRef inAQ,
AudioQueuePropertyID inID)
{
AQPlayer *THIS = (AQPlayer *)inUserData;
UInt32 size = sizeof(THIS->mIsRunning);
OSStatus result = AudioQueueGetProperty (inAQ, kAudioQueueProperty_IsRunning, &THIS->mIsRunning, &size);
if ((result == noErr) && (!THIS->mIsRunning))
[[NSNotificationCenter defaultCenter] postNotificationName: @"playbackQueueStopped" object: nil];
}
void AQPlayer::CalculateBytesForTime (CAStreamBasicDescription & inDesc, UInt32 inMaxPacketSize, Float64 inSeconds, UInt32 *outBufferSize, UInt32 *outNumPackets)
{
// we only use time here as a guideline
// we're really trying to get somewhere between 16K and 64K buffers, but not allocate too much if we don't need it
static const int maxBufferSize = 0x10000; // limit size to 64K
static const int minBufferSize = 0x4000; // limit size to 16K
if (inDesc.mFramesPerPacket) {
Float64 numPacketsForTime = inDesc.mSampleRate / inDesc.mFramesPerPacket * inSeconds;
*outBufferSize = numPacketsForTime * inMaxPacketSize;
} else {
// if frames per packet is zero, then the codec has no predictable packet == time
// so we can't tailor this (we don't know how many Packets represent a time period
// we'll just return a default buffer size
*outBufferSize = maxBufferSize > inMaxPacketSize ? maxBufferSize : inMaxPacketSize;
}
// we're going to limit our size to our default
if (*outBufferSize > maxBufferSize && *outBufferSize > inMaxPacketSize)
*outBufferSize = maxBufferSize;
else {
// also make sure we're not too small - we don't want to go the disk for too small chunks
if (*outBufferSize < minBufferSize)
*outBufferSize = minBufferSize;
}
*outNumPackets = *outBufferSize / inMaxPacketSize;
}
AQPlayer::AQPlayer() :
mQueue(0),
mAudioFile(0),
mFilePath(NULL),
mIsRunning(false),
mIsInitialized(false),
mNumPacketsToRead(0),
mCurrentPacket(0),
mIsDone(false),
mIsLooping(false) { }
AQPlayer::~AQPlayer()
{
DisposeQueue(true);
}
OSStatus AQPlayer::StartQueue(BOOL inResume)
{
if (mQueue == NULL)
CreateQueueForFile(mFilePath);
mIsDone = false;
if (!inResume)
mCurrentPacket = 0;
for (int i = 0; i < kNumberBuffers; ++i) {
AQBufferCallback (this, mQueue, mBuffers[i]);
}
NSLog(@"audioqueuestart");
UInt32 i =0;
AudioQueuePrime(mQueue, 0, &i);
NSLog(@"%d",(unsigned int)i);
return AudioQueueStart(mQueue, NULL);
}
OSStatus AQPlayer::StopQueue()
{
OSStatus result = AudioQueueStop(mQueue, true);
if (result) printf("ERROR STOPPING QUEUE!n");
return result;
}
OSStatus AQPlayer::PauseQueue()
{
OSStatus result = AudioQueuePause(mQueue);
return result;
}
void AQPlayer::CreateQueueForFile(CFStringRef inFilePath)
{
try {
UInt32 size = sizeof(mDataFormat);
mDataFormat.mSampleRate = 44100;
mDataFormat.mFormatID = kAudioFormatMPEG4AAC;
mDataFormat.mFormatFlags = 0;
mDataFormat.mFramesPerPacket = 1024;
mDataFormat.mChannelsPerFrame = 2;
mDataFormat.mBitsPerChannel = 0;//表示这是一个压缩格式
mDataFormat.mBytesPerPacket = 0;//表示这是一个变比特率压缩
mDataFormat.mBytesPerFrame = 0;
mDataFormat.mReserved = 0;
//aqc.bufferByteSize = 2000;
SetupNewQueue();
}
catch (NSException *e) {
fprintf(stderr, "Error: %@ (%@)n", [e debugDescription], [e description]);
}
}
void AQPlayer::SetupNewQueue()
{
AudioQueueNewOutput(&mDataFormat, AQPlayer::AQBufferCallback, this,//NULL,NULL,0,&mQueue);
CFRunLoopGetCurrent(), kCFRunLoopCommonModes, 0, &mQueue);
UInt32 bufferByteSize;
UInt32 maxPacketSize = MAXPACKETSIZE;
UInt32 size = sizeof(maxPacketSize);
CalculateBytesForTime (mDataFormat, maxPacketSize, kBufferDurationSeconds, &bufferByteSize, &mNumPacketsToRead);
size = sizeof(UInt32);
AudioQueueAddPropertyListener(mQueue, kAudioQueueProperty_IsRunning, isRunningProc, this);
bool isFormatVBR = (mDataFormat.mBytesPerPacket == 0 || mDataFormat.mFramesPerPacket == 0);
AudioQueueSetParameter(mQueue, kAudioQueueParam_Volume, 1.0);
for (int i = 0; i < kNumberBuffers; ++i) {
AudioQueueAllocateBuffer(mQueue, bufferByteSize, &mBuffers[i]);
}
// set the volume of the queue
mIsInitialized = true;
}
void AQPlayer::DisposeQueue(Boolean inDisposeFile)
{
if (mQueue)
{
AudioQueueDispose(mQueue, true);
mQueue = NULL;
}
if (inDisposeFile)
{
if (mAudioFile)
{
AudioFileClose(mAudioFile);
mAudioFile = 0;
}
if (mFilePath)
{
CFRelease(mFilePath);
mFilePath = NULL;
}
}
mIsInitialized = false;
}
谢谢你的时间。
您的输入是 VBR，因此您的缓冲区需要一个随附的数据包描述数组。最初创建缓冲区时，请使用AudioQueueAllocateBufferWithPacketDescriptions:而不是AudioQueueAllocateBuffer:。然后在回调过程中为 while 循环中的每个数据包设置 mStartOffset 、 mDataByteSize 和 mVariableFramesInPacket（始终为零）。