记录两种播放pcm音频方法
单例 .h文件#import <Foundation/Foundation.h>NS_ASSUME_NONNULL_BEGIN@interface WYAudioPlayer : NSObject+ (instancetype)sharedInstance;- (void)playMusicWithPath:(NSURL *)fileURL;//结束播放- (void)stopPlay;// 播放后台传来的声音流- (void)playWithData: (NSData *)data;- (void)clear;/*pcm文件转wav播放 */- (NSString *)getWavFileFromPcmData:(NSString *)filePath;@end
方法一：直接播放pcm文件
#define MIN_SIZE_PER_FRAME 5000 //每个包的大小,室内机要求为960,具体看下面的配置信息#define QUEUE_BUFFER_SIZE 3//缓冲器个数#define SAMPLE_RATE 16000 //采样频率@interface WYAudioPlayer(){AudioQueueRef audioQueue; //音频播放队列AudioStreamBasicDescription _audioDescription;AudioQueueBufferRef audioQueueBuffers[QUEUE_BUFFER_SIZE]; //音频缓存BOOL audioQueueBufferUsed[QUEUE_BUFFER_SIZE]; //判断音频缓存是否在使用NSLock *sysnLock;NSMutableData *tempData;OSStatus osState;}@end@implementation WYAudioPlayerstatic WYAudioPlayer *_shareInstance;static dispatch_once_t onceToken;+ (instancetype)sharedInstance{dispatch_once(&onceToken, ^{_shareInstance = [[self alloc] init];});return _shareInstance;}- (instancetype)init{self = [super init];if (self) {[self initAudioDescriptionSetting];}return self;}- (void)initAudioDescriptionSetting{sysnLock = [[NSLock alloc]init];//设置音频参数 具体的信息需要问后台_audioDescription.mSampleRate = SAMPLE_RATE;_audioDescription.mFormatID = kAudioFormatLinearPCM;// 下面这个是保存音频数据的方式的说明，如可以根据大端字节序或小端字节序，浮点数或整数以及不同体位去保存数据_audioDescription.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;//1单声道 2双声道_audioDescription.mChannelsPerFrame = 1;//每一个packet一侦数据,每个数据包下的桢数，即每个数据包里面有多少桢_audioDescription.mFramesPerPacket = 1;//每个采样点16bit量化 语音每采样点占用位数_audioDescription.mBitsPerChannel = 16;_audioDescription.mBytesPerFrame = (_audioDescription.mBitsPerChannel / 8) * _audioDescription.mChannelsPerFrame;//每个数据包的bytes总数，每桢的bytes数*每个数据包的桢数_audioDescription.mBytesPerPacket = _audioDescription.mBytesPerFrame * _audioDescription.mFramesPerPacket;// 使用player的内部线程播放 新建输出AudioQueueNewOutput(&_audioDescription, AudioPlayerAQInputCallback, (__bridge void * _Nullable)(self), nil, 0, 0, &audioQueue);// 设置音量AudioQueueSetParameter(audioQueue, kAudioQueueParam_Volume, 1.0);// 初始化需要的缓冲区for (int i = 0; i < QUEUE_BUFFER_SIZE; i++) {audioQueueBufferUsed[i] = false;osState = AudioQueueAllocateBuffer(audioQueue, MIN_SIZE_PER_FRAME, &audioQueueBuffers[i]);printf("第 %d 个AudioQueueAllocateBuffer 初始化结果 %d (0表示成功)", i + 1, osState);}osState = AudioQueueStart(audioQueue, NULL);if (osState != noErr) {NSLog(@"AudioQueueStart Error");}}- (void)resetPlay{if (audioQueue != nil) {AudioQueueReset(audioQueue);}}// 播放相关- (void)playWithData:(NSData *)data{[sysnLock lock];tempData = [NSMutableData new];[tempData appendData: data];// 得到数据NSUInteger len = tempData.length;Byte *bytes = (Byte*)malloc(len);[tempData getBytes:bytes length: len];int i = 0;while (true) {if (!audioQueueBufferUsed[i]) {audioQueueBufferUsed[i] = true;break;}else {i++;if (i >= QUEUE_BUFFER_SIZE) {i = 0;}}}audioQueueBuffers[i] -> mAudioDataByteSize = (unsigned int)len;// 把bytes的头地址开始的len字节给mAudioDatamemcpy(audioQueueBuffers[i] -> mAudioData, bytes, len);//if (bytes) {free(bytes);}AudioQueueEnqueueBuffer(audioQueue, audioQueueBuffers[i], 0, NULL);printf("本次播放数据大小: %lu", (unsigned long)len);[sysnLock unlock];}// ************************** 回调 **********************************// 回调回来把buffer状态设为未使用static void AudioPlayerAQInputCallback(void* inUserData,AudioQueueRef audioQueueRef, AudioQueueBufferRef audioQueueBufferRef) {WYAudioPlayer* player = (__bridge WYAudioPlayer*)inUserData;[player resetBufferState:audioQueueRef and:audioQueueBufferRef];}- (void)resetBufferState:(AudioQueueRef)audioQueueRef and:(AudioQueueBufferRef)audioQueueBufferRef {for (int i = 0; i < QUEUE_BUFFER_SIZE; i++) {// 将这个buffer设为未使用if (audioQueueBufferRef == audioQueueBuffers[i]) {audioQueueBufferUsed[i] = false;}}}// ************************** 内存回收 **********************************- (void)dealloc{if (audioQueue != nil) {AudioQueueStop(audioQueue,true);}audioQueue = nil;sysnLock = nil;avAudioPlayer = nil;avAudioPlayer.delegate = nil;}/********* 单例清除 ***********/- (void)clear{AVAudioSession *session = [AVAudioSession sharedInstance];[session setCategory:AVAudioSessionCategoryPlayAndRecordwithOptions:AVAudioSessionCategoryOptionDefaultToSpeakererror:nil];if (audioQueue != nil) {AudioQueueStop(audioQueue,true);}audioQueue = nil;sysnLock = nil; onceToken = 0; // 只有置成0,GCD才会认为它从未执行过.它默认为0.这样才能保证下次再次调用shareInstance的时候,再次创建对象._shareInstance = nil;}@end
播放pcm音频直接调用：
/*urlStr：http://xxx.xxx.xxx.xxx:xxxx/509.pcmpcm文件地址*/NSData *audioData = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlStr]];NSMutableData *mData = [[NSMutableData alloc] initWithData:audioData];NSInteger tem = 5000;NSInteger count = mData.length/tem+1;for (int i = 0; i<count; i++) {NSData *subData ;if (i == count-1) {subData = [mData subdataWithRange:NSMakeRange(i*tem, mData.length-i*tem)];}else{subData = [mData subdataWithRange:NSMakeRange(i*tem, tem)];}NSLog(@"数据i------：%d",i);[[WYAudioPlayer sharedInstance] playWithData:subData];}[[WYAudioPlayer sharedInstance] clear];
方法二：将PCM数据文件转换为WAV文件播放wav音频
将PCM数据文件转换为WAV文件其实就是在PCM数据前加上WAV的头。只需要设置好码率，声道数，采样位数就可以。简单来说：pcm是无损wav文件中音频数据的一种编码方式，pcm和wav的区别，简单概括成pcm少了一个wav头描述信息。
将pcm转成wav：
导入头文件#import <AVFoundation/AVFoundation.h>@interface WYAudioPlayer()<AVAudioPlayerDelegate>{AVAudioPlayer *avAudioPlayer;}@end@implementation WYAudioPlayerstatic WYAudioPlayer *_shareInstance;static dispatch_once_t onceToken;+ (instancetype)sharedInstance{dispatch_once(&onceToken, ^{_shareInstance = [[self alloc] init];});return _shareInstance;}- (NSString *)getWavFileFromPcmData:(NSString *)filePath{NSString *wavFilePath = [self wavFilePath]; //wav文件的路径NSLog(@"PCM file path : %@",filePath); //pcm文件的路径FILE *fout;short NumChannels = 1; //录音通道数short BitsPerSample = 16; //线性采样位数int SamplingRate = 16000;//录音采样率(Hz)int numOfSamples = (int)[[NSData dataWithContentsOfURL:[NSURL URLWithString:filePath]] length];int ByteRate = NumChannels*BitsPerSample*SamplingRate/8;short BlockAlign = NumChannels*BitsPerSample/8;int DataSize = NumChannels*numOfSamples*BitsPerSample/8;int chunkSize = 16;int totalSize = 46 + DataSize;short audioFormat = 1;if((fout = fopen([wavFilePath cStringUsingEncoding:1], "w")) == NULL){printf("Error opening out file ");}fwrite("RIFF", sizeof(char), 4,fout);fwrite(&totalSize, sizeof(int), 1, fout);fwrite("WAVE", sizeof(char), 4, fout);fwrite("fmt ", sizeof(char), 4, fout);fwrite(&chunkSize, sizeof(int),1,fout);fwrite(&audioFormat, sizeof(short), 1, fout);fwrite(&NumChannels, sizeof(short),1,fout);fwrite(&SamplingRate, sizeof(int), 1, fout);fwrite(&ByteRate, sizeof(int), 1, fout);fwrite(&BlockAlign, sizeof(short), 1, fout);fwrite(&BitsPerSample, sizeof(short), 1, fout);fwrite("data", sizeof(char), 4, fout);fwrite(&DataSize, sizeof(int), 1, fout);fclose(fout);NSMutableData *pamdata = [NSMutableData dataWithContentsOfURL:[NSURL URLWithString:filePath]];NSFileHandle *handle;handle = [NSFileHandle fileHandleForUpdatingAtPath:wavFilePath];[handle seekToEndOfFile];[handle writeData:pamdata];[handle closeFile];return wavFilePath;}- (NSString *)wavFilePath{NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];NSString *urlPath = [path stringByAppendingPathComponent:@"speaker.wav"];return urlPath;}//音乐播放- (void)playMusicWithPath:(NSURL *)fileURL{[self stopPlay];// 1.获取要播放音频文件的URL// 2.创建 AVAudioPlayer 对象avAudioPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:fileURL error:nil];[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];// 3.打印歌曲信息// NSString *msg = [NSString stringWithFormat:@"音频文件声道数:%ld\n 音频文件持续时间:%g",audioPlayer.numberOfChannels,audioPlayer.duration];// 4.设置循环播放avAudioPlayer.numberOfLoops = 0;avAudioPlayer.volume = 1;avAudioPlayer.delegate = self;// 5.开始播放[avAudioPlayer play];}结束播放- (void)stopPlay{// NSLog(@"销毁播放器");[avAudioPlayer stop];avAudioPlayer = nil;avAudioPlayer.delegate = nil;}@end
播放wav音频直接调用：
/*urlStr：http://xxx.xxx.xxx.xxx:xxxx/509.pcmpcm文件地址*/NSString *wavData = [[WYAudioPlayer sharedInstance] getWavFileFromPcmData:urlStr];[[WYAudioPlayer sharedInstance] playMusicWithPath:[NSURL URLWithString:wavData]];
