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Mis à jour : Avril 2013
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movenc : Remove an outdated comment
3 novembre 2014, par Martin Storsjö -
movenc : Remove an outdated comment
3 novembre 2014, par Martin Storsjö -
Get MP3 content in C ? ffmpeg or mpg123lib ?
20 novembre 2014, par Nicolás MúneraI’m trying for a personal project of mine to mix two mp3 files into one. I’ve been investigating for a couple of days how to read an mp3 with C and i’ve come up with two libraries, ffmpeg and mpg3lib, unfortunately the documentation is a little bit confusing.
For now I’m trying to get the content of one MP3 file, I just want to understand which parts are valuable and which parts of the data I get are the ones i’m supposed to mix together. This is what i’ve got so far :
int cont = 0;
fprintf(stderr, "Starting decode...\n");
while(1)
{
len = fread(buf, sizeof(unsigned char), INBUFF, in);
if(len <= 0)
break;
inc += len;
ret = mpg123_feed(m, buf, len);
while(ret != MPG123_ERR && ret != MPG123_NEED_MORE)
{
ret = mpg123_decode_frame(m, &num, &audio, &bytes);
if(ret == MPG123_NEW_FORMAT)
{
mpg123_getformat(m, &rate, &channels, &enc);
initwavformat();
initwav();
fprintf(stderr, "New format: %li Hz, %i channels, encoding value %i\n", rate, channels, enc);
}
printf("Frame # %d: %s\n",cont,audio);
fwrite(audio, sizeof(unsigned char), bytes, out);
outc += bytes;
}
if(ret == MPG123_ERR){
fprintf(stderr, "Error: %s", mpg123_strerror(m));
break;
}
cont++;
}With this code, I think i’m getting the content of the MP3, but when I print it I just get some weird characters, so I don’t know which strategy i should take.
Could you guys give me a little bit of advice with this ?
Thank you !