//
// MainViewController.m
// RawAudioDataPlayer
//
// Created by SamYou on 12-8-18.
// Copyright (c) 2012年 SamYou. All rights reserved.
//
#import "MainViewController.h"
@interface MainViewController ()
@end
@implementation MainViewController
#pragma mark -
#pragma mark life cycle
- (id)init
{
self = [super init];
if (self) {
NSString *filepath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"audio.raw"];
NSLog(@"filepath = %@",filepath);
NSFileManager *manager = [NSFileManager defaultManager];
NSLog(@"file exist = %d",[manager fileExistsAtPath:filepath]);
NSLog(@"file size = %lld",[[manager attributesOfItemAtPath:filepath error:nil] fileSize]) ;
file = fopen([filepath UTF8String], "r");
if(file)
{
fseek(file, , SEEK_SET);
pcmDataBuffer = malloc(EVERY_READ_LENGTH);
}
else{
NSLog(@"!!!!!!!!!!!!!!!!");
}
synlock = [[NSLock alloc] init];
}
return self;
}
-(void)loadView
{
[super loadView];
self.view.backgroundColor = [UIColor grayColor];
UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button1.frame = CGRectMake(, , , );
[button1 setTitle:@"button1" forState:UIControlStateNormal];
[button1 setTitle:@"button1" forState:UIControlStateHighlighted];
[button1 addTarget:self action:@selector(onbutton1clicked) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button1];
UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button2.frame = CGRectMake(, , , );
[button2 setTitle:@"button2" forState:UIControlStateNormal];
[button2 setTitle:@"button2" forState:UIControlStateHighlighted];
[button2 addTarget:self action:@selector(onbutton2clicked) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button2];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
-(void)onbutton1clicked
{
[self initAudio];
NSLog(@"onbutton1clicked");
AudioQueueStart(audioQueue, NULL);
for(int i=;i<QUEUE_BUFFER_SIZE;i++)
{
[self readPCMAndPlay:audioQueue buffer:audioQueueBuffers[i]];
}
/*
audioQueue使用的是驱动回调方式，即通过AudioQueueEnqueueBuffer(outQ, outQB, 0, NULL);传入一个buff去播放，播放完buffer区后通过回调通知用户,
用户得到通知后再重新初始化buff去播放，周而复始,当然，可以使用多个buff提高效率(测试发现使用单个buff会小卡)
*/
}
-(void)onbutton2clicked
{
NSLog(@"onbutton2clicked");
}
#pragma mark -
#pragma mark player call back
/*
试了下其实可以不用静态函数，但是c写法的函数内是无法调用[self ***]这种格式的写法，所以还是用静态函数通过void *input来获取原类指针
这个回调存在的意义是为了重用缓冲buffer区，当通过AudioQueueEnqueueBuffer(outQ, outQB, 0, NULL);函数放入queue里面的音频文件播放完以后，通过这个函数通知
调用者，这样可以重新再使用回调传回的AudioQueueBufferRef
*/
static void AudioPlayerAQInputCallback(void *input, AudioQueueRef outQ, AudioQueueBufferRef outQB)
{
NSLog(@"AudioPlayerAQInputCallback");
MainViewController *mainviewcontroller = (MainViewController *)input;
[mainviewcontroller checkUsedQueueBuffer:outQB];
[mainviewcontroller readPCMAndPlay:outQ buffer:outQB];
}
-(void)initAudio
{
///设置音频参数
audioDescription.mSampleRate = ;//采样率
audioDescription.mFormatID = kAudioFormatLinearPCM;
audioDescription.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
audioDescription.mChannelsPerFrame = ;///单声道
audioDescription.mFramesPerPacket = ;//每一个packet一侦数据
audioDescription.mBitsPerChannel = ;//每个采样点16bit量化
audioDescription.mBytesPerFrame = (audioDescription.mBitsPerChannel/) * audioDescription.mChannelsPerFrame;
audioDescription.mBytesPerPacket = audioDescription.mBytesPerFrame ;
///创建一个新的从audioqueue到硬件层的通道
// AudioQueueNewOutput(&audioDescription, AudioPlayerAQInputCallback, self, CFRunLoopGetCurrent(), kCFRunLoopCommonModes, 0, &audioQueue);///使用当前线程播
AudioQueueNewOutput(&audioDescription, AudioPlayerAQInputCallback, self, nil, nil, , &audioQueue);//使用player的内部线程播
////添加buffer区
for(int i=;i<QUEUE_BUFFER_SIZE;i++)
{
int result = AudioQueueAllocateBuffer(audioQueue, MIN_SIZE_PER_FRAME, &audioQueueBuffers[i]);///创建buffer区，MIN_SIZE_PER_FRAME为每一侦所需要的最小的大小，该大小应该比每次往buffer里写的最大的一次还大
NSLog(@"AudioQueueAllocateBuffer i = %d,result = %d",i,result);
}
}
-(void)readPCMAndPlay:(AudioQueueRef)outQ buffer:(AudioQueueBufferRef)outQB
{
[synlock lock];
int readLength = fread(pcmDataBuffer, , EVERY_READ_LENGTH, file);//读取文件
NSLog(@"read raw data size = %d",readLength);
outQB->mAudioDataByteSize = readLength;
Byte *audiodata = (Byte *)outQB->mAudioData;
for(int i=;i<readLength;i++)
{
audiodata[i] = pcmDataBuffer[i];
}
/*
将创建的buffer区添加到audioqueue里播放
AudioQueueBufferRef用来缓存待播放的数据区，AudioQueueBufferRef有两个比较重要的参数，AudioQueueBufferRef->mAudioDataByteSize用来指示数据区大小，AudioQueueBufferRef->mAudioData用来保存数据区
*/
AudioQueueEnqueueBuffer(outQ, outQB, , NULL);
[synlock unlock];
}
-(void)checkUsedQueueBuffer:(AudioQueueBufferRef) qbuf
{
if(qbuf == audioQueueBuffers[])
{
NSLog(@"AudioPlayerAQInputCallback,bufferindex = 0");
}
if(qbuf == audioQueueBuffers[])
{
NSLog(@"AudioPlayerAQInputCallback,bufferindex = 1");
}
if(qbuf == audioQueueBuffers[])
{
NSLog(@"AudioPlayerAQInputCallback,bufferindex = 2");
}
if(qbuf == audioQueueBuffers[])
{
NSLog(@"AudioPlayerAQInputCallback,bufferindex = 3");
}
}
@end