ios - How to convert wav to mp3 for samplerate 16000? -


i'm trying make conversion wav file mp3 using samplerate 16000. after converting quality of audio not , speed seems increased. worked if audio conversion sample rate set 8000. have created method wav mp3:

+(void)convertfromwavtomp3:(nsstring *)filepath filename:(nsstring *)kfilename samplerate:(int)ksamplerate failaction:(wavtomp3completionblock)failblock successaction:(wavtomp3completionblock)successblock

{

nslog(@"%@", [filepath stringbydeletinglastpathcomponent]);  nsstring *mp3filename = kfilename; mp3filename = [mp3filename stringbyappendingstring:@".mp3"]; nsstring *mp3filepath = [[filepath stringbydeletinglastpathcomponent] stringbyappendingpathcomponent:mp3filename];  nslog(@"%@", mp3filepath);  @try {     int read, write;      nsfilemanager *filemgr;     filemgr = [nsfilemanager defaultmanager];     char const *path_cstr = [filemgr filesystemrepresentationwithpath:filepath];      file *pcm = fopen(path_cstr, "rb");  //source     fseek(pcm, 4*1024, seek_cur);                                   //skip file header     file *mp3 = fopen([mp3filepath cstringusingencoding:1], "wb");  //output      const int pcm_size = 16384;     const int mp3_size = 16384;     short int pcm_buffer[pcm_size*2];     unsigned char mp3_buffer[mp3_size];      lame_t lame = lame_init();     lame_set_in_samplerate(lame, 8000);     lame_set_num_channels(lame, 1);     lame_set_vbr(lame, vbr_default);    // lame_set_brate(lame, 128);      lame_set_quality(lame, 0);     lame_set_brate(lame, 128);      lame_set_num_samples(lame, 8000);     lame_set_out_samplerate(lame, 8000);     lame_set_mode(lame, 3);      lame_init_params(lame);      lame_print_config(lame);      {         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);     successblock(true); } @catch (nsexception *exception) {     nslog(@"%@",[exception description]);     failblock(false); } @finally {  }

for converting wave mp3 use can use extaudiofileconverter class : https://github.com/lixing123/extaudiofileconverter

for converting mp3 sample rate 16000:

extaudioconverter* converter = [[extaudioconverter alloc] init]; converter.outputsamplerate = 16000; converter.outputnumberchannels = 2; converter.outputbitdepth = bitdepth_16; converter.outputformatid = kaudioformatlinearpcm; converter.outputfiletype = kaudiofilemp3type;  converter.inputfile =  @"desktop/input.wav"; converter.outputfile = @"desktop/output.mp3"; [converter convert];

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