//
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// ConvertAudioFile.m
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// Expert
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//
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// Created by xuxiwen on 2017/3/21.
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// Copyright © 2017年 xuxiwen. All rights reserved.
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//
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#import "ConvertAudioFile.h"
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#import <lame/lame.h>
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@interface ConvertAudioFile ()
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@property (nonatomic, assign) BOOL stopRecord;
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@end
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@implementation ConvertAudioFile
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/**
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get instance obj
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@return ConvertAudioFile instance
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*/
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+ (instancetype)sharedInstance {
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static ConvertAudioFile *instance = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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instance = [[ConvertAudioFile alloc] init];
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});
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return instance;
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}
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/**
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ConvertMp3
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@param cafFilePath caf FilePath
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@param mp3FilePath mp3 FilePath
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@param sampleRate sampleRate (same record sampleRate set)
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@param callback callback result
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*/
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//- (void)conventToMp3WithCafFilePath:(NSString *)cafFilePath
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// mp3FilePath:(NSString *)mp3FilePath
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// sampleRate:(int)sampleRate
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// callback:(void(^)(BOOL result))callback
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//{
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//
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// NSLog(@"convert begin!!");
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// __weak typeof(self) weakself = self;
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// dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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//
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// weakself.stopRecord = NO;
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//
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// @try {
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//
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// int read, write;
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//
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// FILE *pcm = fopen([cafFilePath cStringUsingEncoding:NSASCIIStringEncoding], "rb");
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// FILE *mp3 = fopen([mp3FilePath cStringUsingEncoding:NSASCIIStringEncoding], "wb+");
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//
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// const int PCM_SIZE = 8192;
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// const int MP3_SIZE = 8192;
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// short int pcm_buffer[PCM_SIZE * 2];
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// unsigned char mp3_buffer[MP3_SIZE];
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//
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// lame_t lame = lame_init();
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// lame_set_in_samplerate(lame, sampleRate);
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// lame_set_VBR(lame, vbr_default);
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// lame_init_params(lame);
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//
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// long curpos;
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// BOOL isSkipPCMHeader = NO;
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//
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// do {
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// curpos = ftell(pcm);
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// long startPos = ftell(pcm);
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// fseek(pcm, 0, SEEK_END);
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// long endPos = ftell(pcm);
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// long length = endPos - startPos;
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// fseek(pcm, curpos, SEEK_SET);
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//
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// if (length > PCM_SIZE * 2 * sizeof(short int)) {
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//
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// if (!isSkipPCMHeader) {
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// //Uump audio file header, If you do not skip file header
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// //you will heard some noise at the beginning!!!
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// fseek(pcm, 4 * 1024, SEEK_CUR);
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// isSkipPCMHeader = YES;
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// NSLog(@"skip pcm file header !!!!!!!!!!");
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// }
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//
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// read = (int)fread(pcm_buffer, 2 * sizeof(short int), PCM_SIZE, pcm);
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// write = lame_encode_buffer_interleaved(lame, pcm_buffer, read, mp3_buffer, MP3_SIZE);
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// fwrite(mp3_buffer, write, 1, mp3);
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//// NSLog(@"read %d bytes", write);
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// } else {
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// [NSThread sleepForTimeInterval:0.05];
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//// NSLog(@"sleep");
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// }
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//
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// } while (! weakself.stopRecord);
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//
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// read = (int)fread(pcm_buffer, 2 * sizeof(short int), PCM_SIZE, pcm);
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// write = lame_encode_flush(lame, mp3_buffer, MP3_SIZE);
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//
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// NSLog(@"read %d bytes and flush to mp3 file", write);
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// lame_mp3_tags_fid(lame, mp3);
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//
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// lame_close(lame);
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// fclose(mp3);
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// fclose(pcm);
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// }
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// @catch (NSException *exception) {
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// NSLog(@"%@", [exception description]);
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// if (callback) {
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// callback(NO);
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// }
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// }
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// @finally {
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// if (callback) {
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// callback(YES);
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// }
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// NSLog(@"convert mp3 finish!!! %@", mp3FilePath);
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// }
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// });
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//
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//}
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/**
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send end record signal
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*/
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- (void)sendEndRecord {
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self.stopRecord = YES;
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}
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- (void)conventToMp3WithCafFilePath:(NSString *)cafFilePath
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mp3FilePath:(NSString *)mp3FilePath
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sampleRate:(int)sampleRate {
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__weak typeof(self) weakself = self;
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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weakself.stopRecord = NO;
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@try {
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int read, write;
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FILE *pcm = fopen([cafFilePath cStringUsingEncoding:NSASCIIStringEncoding], "rb");
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FILE *mp3 = fopen([mp3FilePath cStringUsingEncoding:NSASCIIStringEncoding], "wb+");
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const int PCM_SIZE = 8192;
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const int MP3_SIZE = 8192;
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short int pcm_buffer[PCM_SIZE * 2];
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unsigned char mp3_buffer[MP3_SIZE];
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lame_t lame = lame_init();
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lame_set_in_samplerate(lame, sampleRate);
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lame_set_VBR(lame, vbr_default);
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lame_init_params(lame);
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long curpos;
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BOOL isSkipPCMHeader = NO;
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do {
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curpos = ftell(pcm);
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long startPos = ftell(pcm);
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fseek(pcm, 0, SEEK_END);
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long endPos = ftell(pcm);
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long length = endPos - startPos;
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fseek(pcm, curpos, SEEK_SET);
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if (length > PCM_SIZE * 2 * sizeof(short int)) {
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if (!isSkipPCMHeader) {
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//Uump audio file header, If you do not skip file header
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//you will heard some noise at the beginning!!!
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fseek(pcm, 4 * 1024, SEEK_CUR);
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isSkipPCMHeader = YES;
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NSLog(@"skip pcm file header !!!!!!!!!!");
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}
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read = (int)fread(pcm_buffer, 2 * sizeof(short int), PCM_SIZE, pcm);
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write = lame_encode_buffer_interleaved(lame, pcm_buffer, read, mp3_buffer, MP3_SIZE);
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fwrite(mp3_buffer, write, 1, mp3);
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// NSLog(@"read %d bytes", write);
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} else {
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[NSThread sleepForTimeInterval:0.05];
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// NSLog(@"sleep");
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}
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} while (! weakself.stopRecord);
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NSLog(@"停止录音回调-----");
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read = (int)fread(pcm_buffer, 2 * sizeof(short int), PCM_SIZE, pcm);
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write = lame_encode_flush(lame, mp3_buffer, MP3_SIZE);
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NSLog(@"read %d bytes and flush to mp3 file", write);
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lame_mp3_tags_fid(lame, mp3);
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lame_close(lame);
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fclose(mp3);
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fclose(pcm);
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}
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@catch (NSException *exception) {
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NSLog(@"出错了");
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NSLog(@"%@", [exception description]);
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}
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@finally {
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NSLog(@"转码完成");
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NSLog(@"convert mp3 finish!!! %@", mp3FilePath);
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}
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});
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}
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#pragma mark - ----------------------------------
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// 这是录完再转码的方法, 如果录音时间比较长的话,会要等待几秒...
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// Use this FUNC convent to mp3 after record
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+ (void)conventToMp3WithCafFilePath:(NSString *)cafFilePath
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mp3FilePath:(NSString *)mp3FilePath
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sampleRate:(int)sampleRate
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callback:(void(^)(BOOL result))callback
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{
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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@try {
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int read, write;
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FILE *pcm = fopen([cafFilePath cStringUsingEncoding:1], "rb"); //source 被转换的音频文件位置
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fseek(pcm, 4*1024, SEEK_CUR); //skip file header
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FILE *mp3 = fopen([mp3FilePath cStringUsingEncoding:1], "wb+"); //output 输出生成的Mp3文件位置
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const int PCM_SIZE = 8192;
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const int MP3_SIZE = 8192;
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short int pcm_buffer[PCM_SIZE*2];
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unsigned char mp3_buffer[MP3_SIZE];
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lame_t lame = lame_init();
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lame_set_num_channels(lame,1);//设置1为单通道，默认为2双通道
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lame_set_in_samplerate(lame, sampleRate);
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lame_set_VBR(lame, vbr_default);
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lame_init_params(lame);
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do {
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read = (int)fread(pcm_buffer, 2*sizeof(short int), PCM_SIZE, pcm);
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if (read == 0) {
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write = lame_encode_flush(lame, mp3_buffer, MP3_SIZE);
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} else {
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write = lame_encode_buffer_interleaved(lame, pcm_buffer, read, mp3_buffer, MP3_SIZE);
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}
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fwrite(mp3_buffer, write, 1, mp3);
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} while (read != 0);
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lame_mp3_tags_fid(lame, mp3);
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lame_close(lame);
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fclose(mp3);
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fclose(pcm);
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}
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@catch (NSException *exception) {
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NSLog(@"%@",[exception description]);
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if (callback) {
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callback(NO);
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}
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}
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@finally {
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NSLog(@"-----\n MP3生成成功: %@ ----- \n", mp3FilePath);
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if (callback) {
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callback(YES);
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}
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}
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});
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}
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@end
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