lame mp3 wav文件转mp3 单通道

int read, write;
FILE *pcm = fopen("/Users/liuchan_xin/Desktop/音视频播放与保存例子/ipcamera.wav", "rb");
FILE *mp3 = fopen("/Users/liuchan_xin/Desktop/file.mp3", "wb");

int PCM_SIZE = 640;
int MP3_SIZE = 8192;

short int pcm_buffer[PCM_SIZE];
unsigned char mp3_buffer[MP3_SIZE];

lame_t lame = lame_init();

lame_set_num_channels(lame,1);
lame_set_in_samplerate(lame,8000);
lame_set_brate(lame,8);
lame_set_mode(lame,3);
lame_set_quality(lame,2); /* 2=high 5 = medium 7=low */

lame_init_params(lame);

do {
read = fread(pcm_buffer, sizeof(short int), PCM_SIZE, pcm);

if (read == 0)
write = lame_encode_flush(lame, mp3_buffer, MP3_SIZE);
else
{
write = lame_encode_buffer(lame,
pcm_buffer, NULL,
read,mp3_buffer,MP3_SIZE);
}

fwrite(mp3_buffer, write, 1, mp3);
} while (read != 0);

NSLog(@"save success");

lame_close(lame);
fclose(mp3);
fclose(pcm);