录音后转换mp3, 包括录音UI界面

自己项目中用到了录音转换mp3, 于是整理出来一个Demo

Demo地址:  https://github.com/NieYinlong/Recoding-Convert-Mp3.git

引入lame库(如果引入报does not contain bit code 错, 就Targat->Build Settig->Enabled Bitcode改为NO)

Controller引入相关的头文件中直接调用

////  ViewController.m//  NYL录音转换mp3////  Created by YinlongNie on 16/12/12.//  Copyright © 2016年 Jiuzhekan. All rights reserved.//  利用64位lame库将录音准换成mp3#import "ViewController.h"#import "NYLLeavewordRecordView.h"#import "CommonMethod.h"#import "UIView+WLFrame.h"#import <AVFoundation/AVFoundation.h>@interface ViewController ()<NYLLeavewordRecordViewDelegate>@property (nonatomic, strong) UIButton *twoBtn;@property (nonatomic, strong) NYLLeavewordRecordView *recodeView2;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];        _twoBtn = [CommonMethod createButtonWithButton:_twoBtn whoViewAdd:self.view title:@"点击录音" imageStr:@"" fontSize:17 frame:CGRectMake(0, kScreenHeight-40, kScreenWidth, 40)];    _twoBtn.backgroundColor = [UIColor redColor];    [_twoBtn addTarget:self action:@selector(twoBtnClick) forControlEvents:(UIControlEventTouchUpInside)];        }#pragma mark - 开始录音 ======- (void)twoBtnClick {    // 而会传递之前的值来要求用户同意    [[AVAudioSession sharedInstance] requestRecordPermission:^(BOOL granted) {        if (granted) {            // 用户同意获取数据            dispatch_async(dispatch_get_main_queue(), ^{                                                _recodeView2 = [[NYLLeavewordRecordView alloc] initWithFrame:CGRectMake(0, 0, 0, 0) superVC:self];                _recodeView2.delegate = self;                [self.view addSubview:_recodeView2];                                                // 开始录音                [_recodeView2 recordBtnDidTouchUpInside];                                [self.twoBtn removeTarget:self action:@selector(actionSendVoiceBtnClick) forControlEvents:(UIControlEventTouchUpInside)];                [self.twoBtn setTitle:@"点击发送" forState:(UIControlStateNormal)];                // 点击发送                [self.twoBtn addTarget:self action:@selector(actionSendVoiceBtnClick) forControlEvents:(UIControlEventTouchUpInside)];            });                    } else {            dispatch_async(dispatch_get_main_queue(), ^{                // 可以显示一个提示框告诉用户这个app没有得到允许？                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"温馨提示" message:@"“就这看医生”想访问您的麦克风\n\n请启用麦克风-设置/隐私/麦克风" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];                [alert show];            });        }    }];    }// 点击发送按钮- (void)actionSendVoiceBtnClick {    [_recodeView2 actionSend];}// 取消录音代理- (void)cancleRecordDelegate {        //[_recodeView2 removeFromSuperview];    NSLog(@"已经取消录音代理回调");    }//  点击发送按钮会走该代理回调//  发送录音代理- (void)sendRecordUrlStr:(NSString *)voiceUrlStr timeLong:(NSString *)timeLong {            NSString *msg = [NSString stringWithFormat:@"录音地址:%@\n\n录音时长:%@秒", voiceUrlStr, timeLong];            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"录音完成且换成mp3" message:msg delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];    [alert show];            // 请求网络提交语音文件//    [self requestNetSendVoiceWithUrlStr:voiceUrlStr voiceLength:timeLong];    // if 请求成功    [self.twoBtn removeTarget:self action:@selector(actionSendVoiceBtnClick) forControlEvents:(UIControlEventTouchUpInside)];    [self.twoBtn setTitle:@"点击录音" forState:UIControlStateNormal];    [self.twoBtn addTarget:self action:@selector(twoBtnClick) forControlEvents:UIControlEventTouchUpInside];}/// 改变按钮状态的代理回调- (void)changeBtn {        [self.twoBtn removeTarget:self action:@selector(actionSendVoiceBtnClick) forControlEvents:(UIControlEventTouchUpInside)];    // 变成点录音    [self.twoBtn setTitle:@"点击录音" forState:(UIControlStateNormal)];    [self.twoBtn addTarget:self action:@selector(twoBtnClick) forControlEvents:(UIControlEventTouchUpInside)];}/// 改变按钮状态的代理回调- (void)chageSend {        [self.twoBtn removeTarget:self action:@selector(twoBtnClick) forControlEvents:(UIControlEventTouchUpInside)];    // 变成点击发送    [self.twoBtn setTitle:@"点击发送" forState:(UIControlStateNormal)];    [self.twoBtn addTarget:self action:@selector(actionSendVoiceBtnClick) forControlEvents:(UIControlEventTouchUpInside)];    }- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

转换的核心代码

- (void)audio_PCMtoMP3{        NSString *cafFilePath = nil;    NSString *mp3FilePath = nil;        cafFilePath = self.havedToMp3Path;                NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];            // 拼接要写入文件的路径        //mp3FilePath = [documentsPath stringByAppendingPathComponent:@"MP3advice.mp3"];        // 这里随机路径    NSString *pinJieStr = getCurentTime;    pinJieStr = [NSString stringWithFormat:@"%d%@.mp3",arc4random()%10000, pinJieStr];    mp3FilePath = [documentsPath stringByAppendingPathComponent:pinJieStr];            NSFileManager* fileManager=[NSFileManager defaultManager];    if([fileManager removeItemAtPath:mp3FilePath error:nil])    {        NSLog(@"删除");    }        @try {        int read, write;                FILE *pcm = fopen([cafFilePath cStringUsingEncoding:1], "rb");  //source 被转换的音频文件位置        fseek(pcm, 4*1024, SEEK_CUR);                                   //skip file header        FILE *mp3 = fopen([mp3FilePath cStringUsingEncoding:1], "wb");  //output 输出生成的Mp3文件位置                const int PCM_SIZE = 8192;        const int MP3_SIZE = 8192;        short int pcm_buffer[PCM_SIZE*2];        unsigned char mp3_buffer[MP3_SIZE];                lame_t lame = lame_init();                lame_set_in_samplerate(lame, 11025.0);        lame_set_VBR(lame, vbr_default);        lame_init_params(lame);                do {            read = fread(pcm_buffer, 2*sizeof(short int), PCM_SIZE, pcm);            if (read == 0)                write = lame_encode_flush(lame, mp3_buffer, MP3_SIZE);            else                write = lame_encode_buffer_interleaved(lame, pcm_buffer, read, mp3_buffer, MP3_SIZE);                        fwrite(mp3_buffer, write, 1, mp3);                    } while (read != 0);                lame_close(lame);        fclose(mp3);        fclose(pcm);    }    @catch (NSException *exception) {        NSLog(@"%@",[exception description]);    }    @finally {                            // 记录新的MP3地址        self.havedToMp3Path = mp3FilePath;               if (_delegate && [_delegate respondsToSelector:@selector(sendMp3Url:)]) {            [_delegate sendMp3Url:[NSURL URLWithString:self.havedToMp3Path]];        }                if (_delegate && [_delegate respondsToSelector:@selector(sendMp3Path:)]) {            [_delegate sendMp3Path:self.havedToMp3Path];        }           }}