Use lame in xcode to convert caf files to MP3 files

You must first reference lamp. H, libmp 3lame.

-(Void) audio_pcmtomp3 :( nsstring *) caffilepath tomp3file :( nsstring *) mp3filepath

{

Nsfilemanager * filemanager = [nsfilemanager defaultmanager];

If ([filemanager removeitematpath: mp3filepath error: Nil])

{

Nslog (@ "delete ");

}

@ Try {

Int read, write;

File * PCM = fopen ([caffilepath cstringusingencoding: 1], "rb"); // location of the audio file to which the source is converted

Fseek (PCM, 4*1024, seek_cur); // skip File Header

File * MP3 = fopen ([mp3filepath cstringusingencoding: 1], "WB"); // output the location of the generated MP3 file

Const int pcm_size = 8192;

Const int mp3_size = 8192;

Short int pcm_buffer [pcm_size * 2];

Unsigned char mp3_buffer [mp3_size];

Lame_t lame = lame_init ();

Lame_set_in_samplerate (lame, 11025.0 );

Lame_set_vbr (lame, vbr_default );

Lame_init_params (lame );

Do {

Read = fread (pcm_buffer, 2 * sizeof (short INT), 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 );

}

@ Catch (nsexception * exception ){

Nslog (@ "% @", [exception description]);

}

@ Finally

{

}

}