Recording (PCM format), playback, lame transcoding into MP3

Introduction of the following two libraries. Lame is a third-party library. #import <AVFoundation/AVFoundation.h> #import "Lame.framework/headers/lame.h"
#pragma mark-Audio transcoding/**
* Audio transcoding, from PCM transcoding to MP3
*/
-(void) convertToMP3
{
NSString * Mp3filename = @ "Sendrecord.mp3";
NSString * Documentpath = [Nssearchpathfordirectoriesindomains (nsdocumentdirectory, Nsuserdomainmask, YES) lastObjec T];
NSString *mp3filepath = [Documentpath stringbyappendingpathcomponent:mp3filename];
NSString * Audiofilepath = [NSString stringWithFormat: @ "%@/AUDIO.CAF", documentpath];

NSLog (@ "audiopath:%@", Audiofilepath);

@try {
int read, write;

FILE *PCM = fopen ([Audiofilepath cstringusingencoding:1], "RB"); Source converted audio File location
Fseek (PCM, 4 * 1024x768, seek_cur); Skip File Header
FILE *mp3 = fopen ([Mp3filepath cstringusingencoding:1], "WB"); MP3 file location generated by output outputs

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
{
NSLog (@ "MP3 generated successfully:%@", Mp3filepath);
}
}

#pragma mark-Get the recording file save path
/**
* Get recording Original file save path
*
* @return Recording Original file path
*/
-(Nsurl *) getsavepath{
NSString *urlstr=[nssearchpathfordirectoriesindomains (nsdocumentdirectory, Nsuserdomainmask, YES) lastObject];
Urlstr=[urlstr stringbyappendingpathcomponent: @ "AUDIO.CAF"];
Nsurl *url=[Nsurl Fileurlwithpath:urlstr];
return URL;
}

-(NSString *) getsavepathtostring{
NSString *urlstr=[nssearchpathfordirectoriesindomains (nsdocumentdirectory, Nsuserdomainmask, YES) lastObject];
Urlstr=[urlstr stringbyappendingpathcomponent: @ "AUDIO.CAF"];
return urlstr;
}

/**
* Get MP3 File save path
*
* @return MP3 file path
*/
-(Nsurl *) Getmp3path
{
Play MP3
NSString * Mp3filename = @ "Sendrecord.mp3";
NSString * Documentpath = [Nssearchpathfordirectoriesindomains (nsdocumentdirectory, Nsuserdomainmask, YES) lastObjec T];
NSString *mp3filepath = [Documentpath stringbyappendingpathcomponent:mp3filename];
return [Nsurl Fileurlwithpath:mp3filepath];
}

-(NSString *) getmp3pathtostring
{
Play MP3
NSString * Mp3filename = @ "Sendrecord.mp3";
NSString * Documentpath = [Nssearchpathfordirectoriesindomains (nsdocumentdirectory, Nsuserdomainmask, YES) lastObjec T];
NSString *mp3filepath = [Documentpath stringbyappendingpathcomponent:mp3filename];
return mp3filepath;
}

#pragma mark-Get the recording file set
/**
* Get audio File Settings
*
* @return Recording settings
*/
-(Nsdictionary *) getaudiosetting{
Nsmutabledictionary *dicm=[Nsmutabledictionary Dictionary];
Set the recording format
[DicM setobject: @ (KAUDIOFORMATLINEARPCM) Forkey:avformatidkey];
Set the recording sample rate, 8000 is the phone sample rate, for the general recording is enough
[DicM setobject: @ (11025.0) Forkey:avsampleratekey]