1.使用lame库实现pcm和mp3格式转换，官网http://lame.sourceforge.net/下载lame.h和libmp3lame.a库文件

intread, write;

FILE*pcm =fopen([WAVFilePathcStringUsingEncoding: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([mp3FilePathcStringUsingEncoding:1],"wb");//output输出生成的Mp3文件位置

constintPCM_SIZE =8192;

constintMP3_SIZE =8192;

shortintpcm_buffer[PCM_SIZE*2];

unsignedcharmp3_buffer[MP3_SIZE];

lame_tlame =lame_init();

lame_set_in_samplerate(lame,22050.0);//采样率22050.0

lame_set_VBR(lame,vbr_default);

lame_init_params(lame);

do{

read =fread(pcm_buffer,2*sizeof(shortint), 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);