I am encoding a LinearPCM to MP3 in iOS.I'm trying to encode the raw PCM data from microphone to MP3 using AudioToolbox framework and Lame.And although everything seems to run fine if i record an audio it is converted to mp3 with the help of lame encoding concept while play the recorded mp3 audio file working fine.now i want to convert audio(using lame) like low,medium,high quality mp3 file. i don't know exact setting(sample rate,bit depth,bit rate, chennal,quality) while lame conversion process
void AQRecorder::MyInputBufferHandler( void * inUserData,
AudioQueueRef inAQ,
AudioQueueBufferRef inBuffer,
const AudioTimeStamp * inStartTime,
UInt32 inNumPackets,
const AudioStreamPacketDescription* inPacketDesc)
{
AQRecorder *aqr = (AQRecorder *)inUserData;
// NSLog(@"%f",inStartTime->mSampleTime);
try
{
if (inNumPackets > 0)
{
AudioFileWritePackets(aqr->mRecordFile, FALSE, inBuffer->mAudioDataByteSize, inPacketDesc, aqr->mRecordPacket, &inNumPackets, inBuffer->mAudioData);
aqr->mRecordPacket += inNumPackets;
int MP3_SIZE =inBuffer->mAudioDataByteSize * 4;
unsigned char mp3_buffer[MP3_SIZE];
lame_t lame = lame_init();
lame_set_in_samplerate(lame, 44100);
lame_set_VBR(lame, vbr_default);
lame_init_params(lame);
// int encodedBytes=lame_encode_buffer_interleaved(lame, (short int *)inBuffer->mAudioData , inNumPackets, mp3_buffer, MP3_SIZE);
int encodedBytes = lame_encode_buffer(lame, (short*)inBuffer->mAudioData, (short*)inBuffer->mAudioData, inNumPackets, mp3_buffer, MP3_SIZE);
[delegate.mp3AudioData appendBytes:mp3_buffer length:encodedBytes];
if (inBuffer->mAudioDataByteSize != 0) {
}
else
{
int encode=lame_encode_flush(lame, mp3_buffer, MP3_SIZE);
[delegate.mp3AudioData appendBytes:mp3_buffer length:encode];
}
lame_close(lame);
}
if (aqr->IsRunning())
{
AudioQueueEnqueueBuffer(inAQ, inBuffer, 0, NULL);
}
} catch (CAXException e)
{
char buf[256];
fprintf(stderr, "Error: %s (%s)\n", e.mOperation, e.FormatError(buf));
}
}
Try this,
Low quality:
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication]delegate];
NSMutableDictionary *dictAudioQuality =[[NSMutableDictionary alloc]init];
[dictAudioQuality setValue:@"Low" forKey:@"audioquality"];
[dictAudioQuality setValue:@"11025" forKey:@"samplerate"];
[dictAudioQuality setValue:@"16" forKey:@"bitdepth"];
[dictAudioQuality setValue:@"120" forKey:@"bitrate"];
[dictAudioQuality setValue:@"1" forKey:@"channel"];
Medium Quality:
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication]delegate];
NSMutableDictionary *dictAudioQuality =[[NSMutableDictionary alloc]init];
[dictAudioQuality setValue:@"Medium" forKey:@"audioquality"];
[dictAudioQuality setValue:@"22050" forKey:@"samplerate"];
[dictAudioQuality setValue:@"16" forKey:@"bitdepth"];
[dictAudioQuality setValue:@"240" forKey:@"bitrate"];
[dictAudioQuality setValue:@"1" forKey:@"channel"];
High Quality:
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication]delegate];
NSMutableDictionary *dictAudioQuality =[[NSMutableDictionary alloc]init];
[dictAudioQuality setValue:@"High" forKey:@"audioquality"];
[dictAudioQuality setValue:@"44100" forKey:@"samplerate"];
[dictAudioQuality setValue:@"24" forKey:@"bitdepth"];
[dictAudioQuality setValue:@"320" forKey:@"bitrate"];
[dictAudioQuality setValue:@"2" forKey:@"channel"];
AQRecorder.m Start Record
void AQRecorder::StartRecord(CFStringRef inRecordFile)
{
int i, bufferByteSize;
UInt32 size;
delegate =[[UIApplication sharedApplication]delegate];
nSampleRate =[[delegate.dictMP3Quality valueForKey:@"samplerate"] intValue];
nBitRate =[[delegate.dictMP3Quality valueForKey:@"bitrate"] intValue];
nChannel =[[delegate.dictMP3Quality valueForKey:@"channel"] intValue];
try {
UInt32 category = kAudioSessionCategory_RecordAudio;
OSStatus error = AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(category), &category);
if (error) printf("couldn't set audio category!");
// specify the recording format
SetupAudioFormat(kAudioFormatLinearPCM);
// create the queue
XThrowIfError(AudioQueueNewInput(
&mRecordFormat,
MyInputBufferHandler,
this /* userData */,
NULL /* run loop */, NULL /* run loop mode */,
0 /* flags */, &mQueue), "AudioQueueNewInput failed");
// get the record format back from the queue's audio converter --
// the file may require a more specific stream description than was necessary to create the encoder.
mRecordPacket = 0;
size = sizeof(mRecordFormat);
XThrowIfError(AudioQueueGetProperty(mQueue, kAudioQueueProperty_StreamDescription,
&mRecordFormat, &size), "couldn't get queue's format");
// copy the cookie first to give the file object as much info as we can about the data going in
// not necessary for pcm, but required for some compressed audio
CopyEncoderCookieToFile();
// allocate and enqueue buffers
bufferByteSize = ComputeRecordBufferSize(&mRecordFormat, kBufferDurationSeconds); // enough bytes for half a second
for (i = 0; i < kNumberRecordBuffers; ++i) {
XThrowIfError(AudioQueueAllocateBuffer(mQueue, bufferByteSize, &mBuffers[i]),
"AudioQueueAllocateBuffer failed");
XThrowIfError(AudioQueueEnqueueBuffer(mQueue, mBuffers[i], 0, NULL),
"AudioQueueEnqueueBuffer failed");
}
// start the queue
mIsRunning = true;
XThrowIfError(AudioQueueStart(mQueue, NULL), "AudioQueueStart failed");
lame = lame_init();
lame_set_in_samplerate(lame, mRecordFormat.mSampleRate);
lame_set_out_samplerate(lame, nSampleRate);
lame_set_num_channels(lame, nChannel);
// lame_set_brate(lame, nBitRate);
lame_set_VBR(lame, vbr_default);
lame_init_params(lame);
}
catch (CAXException e) {
char buf[256];
fprintf(stderr, "Error: %s (%s)\n", e.mOperation, e.FormatError(buf));
}
catch (...) {
fprintf(stderr, "An unknown error occurred\n");;
}
}
AQRecorder::MyInputBufferHandler
void AQRecorder::MyInputBufferHandler( void * inUserData,
AudioQueueRef inAQ,
AudioQueueBufferRef inBuffer,
const AudioTimeStamp * inStartTime,
UInt32 inNumPackets,
const AudioStreamPacketDescription* inPacketDesc)
{
AQRecorder *aqr = (AQRecorder *)inUserData;
try
{
if (inNumPackets > 0)
{
AudioFileWritePackets(aqr->mRecordFile, FALSE, inBuffer->mAudioDataByteSize, inPacketDesc, aqr->mRecordPacket, &inNumPackets, inBuffer->mAudioData);
aqr->mRecordPacket += inNumPackets;
int MP3_SIZE =inNumPackets * 4;
unsigned char mp3_buffer[MP3_SIZE];
memset(mp3_buffer, 0, sizeof(mp3_buffer));
// int encodedBytes=lame_encode_buffer_interleaved(lame, (short int*)inBuffer->mAudioData , inNumPackets, mp3_buffer, MP3_SIZE);
int encodedBytes = lame_encode_buffer(aqr->lame, (short int*)inBuffer->mAudioData, (short int*)inBuffer->mAudioData, inNumPackets, mp3_buffer, MP3_SIZE);
[aqr->delegate.mp3AudioData appendBytes:mp3_buffer length:encodedBytes];
if (inBuffer->mAudioDataByteSize != 0) {
}
else
{
int encode=lame_encode_flush(aqr->lame, mp3_buffer, MP3_SIZE);
[aqr->delegate.mp3AudioData appendBytes:mp3_buffer length:encode];
}
{
NSLog(@"------------");
NSLog(@"%d",encodedBytes);
NSLog(@"%lu",inNumPackets);
NSLog(@"%d",MP3_SIZE);
NSLog(@"------------");
}
}
if (aqr->IsRunning())
{
AudioQueueEnqueueBuffer(inAQ, inBuffer, 0, NULL);
}
} catch (CAXException e)
{
char buf[256];
fprintf(stderr, "Error: %s (%s)\n", e.mOperation, e.FormatError(buf));
}
}