//
//  PcmToMp3Manager.h
//  RecordMusic
//
//  Created by YouXianMing on 16/7/28.
//  Copyright © 2016年 YouXianMing. All rights reserved.
//
//  Lame-for-iOS https://github.com/wuqiong/mp3lame-for-iOS
//

#import <Foundation/Foundation.h>
@class PcmToMp3Manager;@protocol PcmToMp3ManagerDelegate <NSObject>@optional/***  Did convert the pcm to mp3.**  @param manager   The PcmToMp3Manager object.*  @param sucess    Sucess or not.*  @param errorInfo Error info.*/
- (void)didConvertPcmToMp3:(PcmToMp3Manager *)manager sucess:(BOOL)sucess errorInfo:(NSString *)errorInfo;@end/***  In "Build Phases", You can add '-Wno-shorten-64-to-32' to the file 'PcmToMp3Manager.m' to ignore the warning.*/
@interface PcmToMp3Manager : NSObject/***  The PcmToMp3Manager's delegate.*/
@property (nonatomic, weak) id <PcmToMp3ManagerDelegate> delegate;/***  The pcm file's path.*/
@property (nonatomic, strong) NSString *pcmFilePath;/***  The mp3 file's path you specified.*/
@property (nonatomic, strong) NSString *mp3FilePath;/***  Before you start convert, you should specified the pcm file's path.*/
- (void)startConvert;@end

//
//  PcmToMp3Manager.m
//  RecordMusic
//
//  Created by YouXianMing on 16/7/28.
//  Copyright © 2016年 YouXianMing. All rights reserved.
//

#import "PcmToMp3Manager.h"
#import <lame/lame.h>@implementation PcmToMp3Manager- (void)startConvert {NSParameterAssert(self.pcmFilePath);BOOL isDirectory = NO;BOOL isExist     = [[NSFileManager defaultManager] fileExistsAtPath:self.pcmFilePath isDirectory:&isDirectory];if (isExist && isDirectory == NO) {dispatch_async(dispatch_get_global_queue(0, 0), ^{@try {int read, write;FILE *pcm = fopen([self.pcmFilePath cStringUsingEncoding:1], "rb");  //sourcefseek(pcm, 4*1024, SEEK_CUR);                                        //skip file headerFILE *mp3 = fopen([self.mp3FilePath cStringUsingEncoding:1], "wb");  //outputconst 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, 44100);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) {if (self.delegate && [self.delegate respondsToSelector:@selector(didConvertPcmToMp3:sucess:errorInfo:)]) {dispatch_async(dispatch_get_main_queue(), ^{[self.delegate didConvertPcmToMp3:self sucess:NO errorInfo:exception.description];});}} @finally {if (self.delegate && [self.delegate respondsToSelector:@selector(didConvertPcmToMp3:sucess:errorInfo:)]) {dispatch_async(dispatch_get_main_queue(), ^{[self.delegate didConvertPcmToMp3:self sucess:YES errorInfo:nil];});}}});} else {if (self.delegate && [self.delegate respondsToSelector:@selector(didConvertPcmToMp3:sucess:errorInfo:)]) {dispatch_async(dispatch_get_main_queue(), ^{[self.delegate didConvertPcmToMp3:self sucess:NO errorInfo:[NSString stringWithFormat:@"'%@' not exist.", self.pcmFilePath]];});}}
}@end