iOS学习笔记25-录音和网络流媒体

一、录音

AVFoundation

AVAudioRecorder

AVAudioRecorder

@property (readonly, getter=isRecording) BOOL recording;//是否正在录音
@property (readonly) NSDictionary<NSString *, id> *settings;//录音配置
@property (readonly) NSURL *url;//录音文件存放URL
@property (readonly) NSTimeInterval currentTime;//录音时长
@property (getter=isMeteringEnabled) BOOL meteringEnabled;//是否监控声波

- (BOOL)prepareToRecord;//为录音准备缓冲区
- (BOOL)record;//录音开始，暂停后调用会恢复录音
- (BOOL)recordAtTime:(NSTimeInterval)time;//在指定时间后开始录音
- (BOOL)recordForDuration:(NSTimeInterval) duration;//按指定时长录音
- (BOOL)recordAtTime:(NSTimeInterval)time
forDuration:(NSTimeInterval)duration;//上面2个的合体
- (void)pause; //中断录音
- (void)stop; //停止录音
- (BOOL)deleteRecording;//删除录音，必须先停止录音再删除

//录音完成后调用
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder
successfully:(BOOL)flag;
//录音编码发送错误时调用
- (void)audioRecorderEncodeErrorDidOccur:(AVAudioRecorder *)recorder
error:(NSError *)error;

AVFoundation

#import <AVFoundation/AVFoundation.h>

AVAudioSessionCategoryPlayAndRecord

AVAudioRecorder

prepareToRecord

record

pause

stop

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface ViewController () <AVAudioRecorderDelegate>

@property (strong, nonatomic) IBOutlet UIProgressView *progressView;
@property (strong, nonatomic) AVAudioRecorder *recorder;
@property (strong, nonatomic) AVAudioPlayer *player;
@property (strong, nonatomic) NSTimer *timer;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
//初始化定时器
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1
target:self
selector:@selector(audioPowerChange)
userInfo:nil
repeats:YES];
self.timer.fireDate = [NSDate distantFuture];//暂停定时器
//初始化音频会话
[self setAVAudioSession];
//初始化录音器
[self initAudioRecorder];
}
/* 获取录音存放路径 */
- (NSString *)getSaveFilePath{
NSString *urlStr = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask,YES).firstObject;
urlStr = [urlStr stringByAppendingPathComponent:@"recorder.caf"];
return urlStr;
}
/* 初始化音频播放器 */
- (void)initAudioPlayer{
NSString *filePath = [self getSaveFilePath];
NSURL *url = [NSURL fileURLWithPath:filePath];
NSError *error = nil;
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:url
error:&error];
if (error) {
NSLog(@"初始化音乐播放器失败");
return;
}
player.numberOfLoops = 0;
[player prepareToPlay];
self.player = player;
}
/* 初始化录音器 */
- (void)initAudioRecorder{
//创建URL
NSString *filePath = [self getSaveFilePath];
NSURL *url = [NSURL fileURLWithPath:filePath];
NSMutableDictionary *settings = [NSMutableDictionary dictionary];
//设置录音格式
[settings setObject:@(kAudioFormatLinearPCM) forKey:AVFormatIDKey];
//设置录音采样率，8000是电话采样率，对于一般录音已经够了
[settings setObject:@(8000) forKey:AVSampleRateKey];
//设置通道,这里采用单声道
[settings setObject:@(1) forKey:AVNumberOfChannelsKey];
//每个采样点位数,分为8、16、24、32
[settings setObject:@(8) forKey:AVLinearPCMBitDepthKey];
//是否使用浮点数采样
[settings setObject:@(YES) forKey:AVLinearPCMIsFloatKey];

//创建录音器
NSError *error = nil;
AVAudioRecorder *recorder = [[AVAudioRecorder alloc] initWithURL:url
settings:settings
error:&error];
if (error) {
NSLog(@"初始化录音器失败");
return;
}
recorder.delegate = self;//设置代理
recorder.meteringEnabled = YES;//如果要监控声波，必须设为YES
[recorder prepareToRecord];//为录音准备缓冲区
self.recorder = recorder;
}
/* 设置音频会话支持录音和音乐播放 */
- (void)setAVAudioSession{
//获取音频会话
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
//设置为播放和录音状态，以便可以在录制完之后播放录音
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:NULL];
//激活修改
[audioSession setActive:YES error:NULL];
}
/* 进度条模拟声波状态，每0.1秒执行一次 */
- (void)audioPowerChange{
//更新测量值
[self.recorder updateMeters];
//取得第一个通道的音频，注意音频强度范围是-160.0到0
float power = [self.recorder averagePowerForChannel:0];
CGFloat progress = (1.0/160.0)*(power+160.0);
self.progressView.progress = progress;
}
/* 点击录音按钮 */
- (IBAction)record:(id)sender {
//录音
if (![self.recorder isRecording]) {
[self.recorder record];
self.timer.fireDate = [NSDate distantPast];//恢复定时器
}
}
/* 点击暂停按钮 */
- (IBAction)pauseRecord:(id)sender {
//录音暂停
if ([self.recorder isRecording]) {
[self.recorder pause];
self.timer.fireDate = [NSDate distantFuture];//暂停定时器
}
}
/* 点击停止按钮 */
- (IBAction)stopRecord:(id)sender {
//录音停止
[self.recorder stop];
self.timer.fireDate = [NSDate distantFuture];//暂停定时器
self.progressView.progress = 0.0;
}
#pragma mark - AVAudioRecorderDelegate代理方法
/* 完成录音会调用 */
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder
successfully:(BOOL)flag
{
//录音完成后自动播放录音
[self initAudioPlayer];
[self.player play];
}
@end

二、网络流媒体

AVAudioPlayer

AVAudioPlayer

AudioToolbox

Audio Queue Services

FreeStreamer

github

FreeStreamer

FreeStreamer/FreeStreamer.xcodeproj

General

#import <FreeStreamer/FreeStreamer.h>

- (void)viewDidLoad {
[super viewDidLoad];
[self initAudioStream];
//播放网络流媒体音频
[self.audioStream play];
}
/* 初始化网络流媒体对象 */
- (void)initAudioStream{
NSString *urlStr = @"http://sc1.111ttt.com/2016/1/02/24/195242042236.mp3";
NSURL *url = [NSURL URLWithString:urlStr];
//创建FSAudioStream对象
self.audioStream = [[FSAudioStream alloc] initWithUrl:url];
//设置播放错误回调Block
self.audioStream.onFailure = ^(FSAudioStreamError error, NSString *description){
NSLog(@"播放过程中发生错误，错误信息：%@",description);
};
//设置播放完成回调Block
self.audioStream.onCompletion = ^(){
NSLog(@"播放完成!");
};
[self.audioStream setVolume:0.5];//设置声音大小
}