音频转换(跛脚)C++WAV -> MP3

Audio conversion (LAME) C++ WAV -> MP3

本文关键字：gt MP3 C++WAV 转换 跛脚 音频      更新时间：2023-10-16

下午好。对不起，我英语说得不太好。

几天来，我一直在尝试将WAV转换为MP3。我用LAME来表示。我可以使用以下命令通过命令提示符转换文件:

lame.exe-B128 - resample 8-mj  "C:   test.wav "  "C:   test.mp3 "

但是我不想通过命令行(为了跨操作系统的可移植性)，但是我不能在c++中这样做(通过LAME库)。

下面是我的代码: 
int main()
{
//...
//...
// extraction of PCM audio data file .wav in file.pcm
short read, write;
FILE *pcm = fopen("file.pcm", "rb");
FILE *mp3 = fopen("file.mp3", "wb");
const int PCM_SIZE = 18424;
const int MP3_SIZE = 13424;
short int pcm_buffer[PCM_SIZE];
unsigned char mp3_buffer[MP3_SIZE];
lame_t lame = lame_init();
if ( lame == NULL ) {
    cout<<"Unable to initialize MP3"<<endl;
    return -1;
}
lame_set_num_channels(lame, 1);
lame_set_in_samplerate(lame, 8000);
lame_set_out_samplerate(lame, 8000);
lame_set_brate(lame, 128);
lame_set_mode(lame, MONO);
lame_set_quality(lame, 2);
lame_set_bWriteVbrTag(lame, 0);
if (( lame_init_params(lame)) < 0) {
    cout << "Unable to initialize MP3 parameters"<<endl;
    return -1;
}
do {
    read = fread(pcm_buffer,sizeof(short), 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);
return 0;
}

我得到一个质量很差的MP3文件(持续时间比原来的短)。

有什么办法可以解决这个问题吗?这是我的信息。
Wav:
- Frequency= 8000
- BlocSize= 16
- Canal Nomber= 1 (mono)
- BytePerSec= 16000
- BytePerBloc= 2
- BitsPerSample= 16
- Bitrate= 128
- .wav size: 13466 (ie size of PCM: 13422)

谢谢。

 @try
 {
int read, write;
FILE *pcm = fopen([cafFilePath cStringUsingEncoding:1], "rb");  //source
fseek(pcm, 4*1024, SEEK_CUR);                                   //skip file header
mp3 = fopen([mp3FilePath cStringUsingEncoding:1], "wb");  //output
const int PCM_SIZE = 8192*3;
const int MP3_SIZE = 8192*3;
short int pcm_buffer[PCM_SIZE*2];
unsigned char mp3_buffer[MP3_SIZE];
lame_t lame = lame_init();
lame_set_in_samplerate(lame, 11025*2);
lame_set_VBR(lame, vbr_default);
lame_init_params(lame);
int nTotalRead=0;
do {
    read = fread(pcm_buffer, 2*sizeof(short int), PCM_SIZE, pcm);
    nTotalRead+=read*4;
    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);
    // write = lame_encode_buffer(lame, pcm_buffer,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]);
}
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