i'm using OpenAL to play background music and sound effects in a game, the code to play background music is this;
- (void) playSoundBack
{
alGenSources(1, &sourceIDBack);
NSString *audioFilePath = [[NSBundle mainBundle] pathForResource:#"music" ofType:#"wav"];
NSURL *audioFileURL = [NSURL fileURLWithPath:audioFilePath];
AudioFileID afid;
OSStatus openAudioFileResult = AudioFileOpenURL((__bridge CFURLRef)audioFileURL, kAudioFileReadPermission, 0, &afid);
if (0 != openAudioFileResult)
{
NSLog(#"An error occurred when attempting to open the audio file %#: %ld", audioFilePath, openAudioFileResult);
return;
}
UInt64 audioDataByteCount = 0;
UInt32 propertySize = sizeof(audioDataByteCount);
OSStatus getSizeResult = AudioFileGetProperty(afid, kAudioFilePropertyAudioDataByteCount, &propertySize, &audioDataByteCount);
if (0 != getSizeResult)
{
NSLog(#"An error occurred when attempting to determine the size of audio file %#: %ld", audioFilePath, getSizeResult);
}
UInt32 bytesRead = (UInt32)audioDataByteCount;
void *audioData = malloc(bytesRead);
OSStatus readBytesResult = AudioFileReadBytes(afid, false, 0, &bytesRead, audioData);
if (0 != readBytesResult)
{
NSLog(#"An error occurred when attempting to read data from audio file %#: %ld", audioFilePath, readBytesResult);
}
AudioFileClose(afid);
ALuint outputBuffer;
alGenBuffers(1, &outputBuffer);
alBufferData(outputBuffer, AL_FORMAT_STEREO16, audioData, bytesRead, 44100);
if (audioData)
{
free(audioData);
audioData = NULL;
}
alSourcef(sourceIDBack, AL_GAIN, 0.1f);
alSourcei(sourceIDBack, AL_BUFFER, outputBuffer);
alSourcei(sourceIDBack, AL_LOOPING, AL_TRUE);
alSourcePlay(sourceIDBack);
}
With another similar block of code i play some effects during the game. All the sound are played but i have a problem with volumes... The background music volume change and it seems not an absolute value... When the other effects are playing the background music volume is low as i have set in with AL_GAIN,but when no other effect is playing the background music sounds too loud (or at least this is my sensation...). Why the music has this behaviour? The volume setting like 0.1 are relative? It is possible to set a fixed and universal value?
Related
I am creating MIDI sounds with MusicDeviceMIDIEvent and it's perfectly fine, I use some aupreset files I've created. One for each instrument.
My code is basically the example from apple: LoadPresetDemo. All I use is:
- (void)loadPreset:(id)sender instrumentName:(const char *)instrumentName {
NSString *presetURL1 = [NSString stringWithCString:instrumentName encoding:NSUTF8StringEncoding];
NSString *path = [[NSBundle mainBundle] pathForResource:presetURL1 ofType:#"aupreset"];
NSURL *presetURL = [[NSURL alloc] initFileURLWithPath: path];
if (presetURL) {
NSLog(#"Attempting to load preset '%#'\n", [presetURL description]);
}
else {
NSLog(#"COULD NOT GET PRESET PATH!");
}
[self loadSynthFromPresetURL: presetURL];
}
To load my aupreset file, then:
- (void) noteOn:(id)sender midiNumber:(int)midiNumber {
UInt32 noteNum = midiNumber;
UInt32 onVelocity = 127;
UInt32 noteCommand = kMIDIMessage_NoteOn << 4 | 0;
OSStatus result = noErr;
require_noerr (result = MusicDeviceMIDIEvent (self.samplerUnit, noteCommand, noteNum, onVelocity, 0), logTheError);
logTheError:
if (result != noErr) NSLog (#"Unable to start playing the low note. Error code: %d '%.4s'\n", (int) result, (const char *)&result);
}
to play the note of the previously loaded aupreset, and:
- (void) noteOff:(id)sender midiNumber:(int)midiNumber
when I want it to stop.
Now I would like to play one note of each instrument simultaneously. What is the easiest way of doing this?
when i play my sound it says there is something wrong with the code but i cannot see what it is. The game runs fine until i try to play the sound which is when it terminates with uncaught exception of type NSException. It is not the best example of Open Al but can anybody see what is wrong with it?
- (id)init
{
self = [super init];
if (self)
{
openALDevice = alcOpenDevice(NULL);
openALContext = alcCreateContext(openALDevice, NULL);
alcMakeContextCurrent(openALContext);
}
return self;
}
-(void)playSound {
NSUInteger sourceID;
alGenSources(1, &sourceID);
NSString *audioFilePath = [[NSBundle mainBundle] pathForResource:#"flyby" ofType:#"caf"];
NSURL *audioFileURL = [NSURL fileURLWithPath:audioFilePath];
AudioFileID afid;
OSStatus openAudioFileResult = AudioFileOpenURL((__bridge CFURLRef)audioFileURL, kAudioFileReadPermission, 0, &afid);
if (0 != openAudioFileResult)
{
NSLog(#"An error occurred when attempting to open the audio file %#: %ld", audioFilePath, openAudioFileResult);
return;
}
UInt64 audioDataByteCount = 0;
UInt32 propertySize = sizeof(audioDataByteCount);
OSStatus getSizeResult = AudioFileGetProperty(afid, kAudioFilePropertyAudioDataByteCount, &propertySize, &audioDataByteCount);
if (0 != getSizeResult)
{
NSLog(#"An error occurred when attempting to determine the size of audio file %#: %ld", audioFilePath, getSizeResult);
}
UInt32 bytesRead = (UInt32)audioDataByteCount;
void *audioData = malloc(bytesRead);
OSStatus readBytesResult = AudioFileReadBytes(afid, false, 0, &bytesRead, audioData);
if (0 != readBytesResult)
{
NSLog(#"An error occurred when attempting to read data from audio file %#: %ld", audioFilePath, readBytesResult);
}
AudioFileClose(afid);
ALuint outputBuffer;
alGenBuffers(1, &outputBuffer);
alBufferData(outputBuffer, AL_FORMAT_STEREO16, audioData, bytesRead, 44100);
if (audioData)
{
free(audioData);
audioData = NULL;
}
alSourcef(sourceID, AL_PITCH, 1.0f);
alSourcef(sourceID, AL_GAIN, 1.0f);
alSourcei(sourceID, AL_BUFFER, outputBuffer);
alSourcePlay(sourceID);
}
Is it theoretically possible to record a phone call on iPhone?
I'm accepting answers which:
may or may not require the phone to be jailbroken
may or may not pass apple's guidelines due to use of private API's (I don't care; it is not for the App Store)
may or may not use private SDKs
I don't want answers just bluntly saying "Apple does not allow that".
I know there would be no official way of doing it, and certainly not for an App Store application, and I know there are call recording apps which place outgoing calls through their own servers.
Here you go. Complete working example. Tweak should be loaded in mediaserverd daemon. It will record every phone call in /var/mobile/Media/DCIM/result.m4a. Audio file has two channels. Left is microphone, right is speaker. On iPhone 4S call is recorded only when the speaker is turned on. On iPhone 5, 5C and 5S call is recorded either way. There might be small hiccups when switching to/from speaker but recording will continue.
#import <AudioToolbox/AudioToolbox.h>
#import <libkern/OSAtomic.h>
//CoreTelephony.framework
extern "C" CFStringRef const kCTCallStatusChangeNotification;
extern "C" CFStringRef const kCTCallStatus;
extern "C" id CTTelephonyCenterGetDefault();
extern "C" void CTTelephonyCenterAddObserver(id ct, void* observer, CFNotificationCallback callBack, CFStringRef name, void *object, CFNotificationSuspensionBehavior sb);
extern "C" int CTGetCurrentCallCount();
enum
{
kCTCallStatusActive = 1,
kCTCallStatusHeld = 2,
kCTCallStatusOutgoing = 3,
kCTCallStatusIncoming = 4,
kCTCallStatusHanged = 5
};
NSString* kMicFilePath = #"/var/mobile/Media/DCIM/mic.caf";
NSString* kSpeakerFilePath = #"/var/mobile/Media/DCIM/speaker.caf";
NSString* kResultFilePath = #"/var/mobile/Media/DCIM/result.m4a";
OSSpinLock phoneCallIsActiveLock = 0;
OSSpinLock speakerLock = 0;
OSSpinLock micLock = 0;
ExtAudioFileRef micFile = NULL;
ExtAudioFileRef speakerFile = NULL;
BOOL phoneCallIsActive = NO;
void Convert()
{
//File URLs
CFURLRef micUrl = CFURLCreateWithFileSystemPath(NULL, (CFStringRef)kMicFilePath, kCFURLPOSIXPathStyle, false);
CFURLRef speakerUrl = CFURLCreateWithFileSystemPath(NULL, (CFStringRef)kSpeakerFilePath, kCFURLPOSIXPathStyle, false);
CFURLRef mixUrl = CFURLCreateWithFileSystemPath(NULL, (CFStringRef)kResultFilePath, kCFURLPOSIXPathStyle, false);
ExtAudioFileRef micFile = NULL;
ExtAudioFileRef speakerFile = NULL;
ExtAudioFileRef mixFile = NULL;
//Opening input files (speaker and mic)
ExtAudioFileOpenURL(micUrl, &micFile);
ExtAudioFileOpenURL(speakerUrl, &speakerFile);
//Reading input file audio format (mono LPCM)
AudioStreamBasicDescription inputFormat, outputFormat;
UInt32 descSize = sizeof(inputFormat);
ExtAudioFileGetProperty(micFile, kExtAudioFileProperty_FileDataFormat, &descSize, &inputFormat);
int sampleSize = inputFormat.mBytesPerFrame;
//Filling input stream format for output file (stereo LPCM)
FillOutASBDForLPCM(inputFormat, inputFormat.mSampleRate, 2, inputFormat.mBitsPerChannel, inputFormat.mBitsPerChannel, true, false, false);
//Filling output file audio format (AAC)
memset(&outputFormat, 0, sizeof(outputFormat));
outputFormat.mFormatID = kAudioFormatMPEG4AAC;
outputFormat.mSampleRate = 8000;
outputFormat.mFormatFlags = kMPEG4Object_AAC_Main;
outputFormat.mChannelsPerFrame = 2;
//Opening output file
ExtAudioFileCreateWithURL(mixUrl, kAudioFileM4AType, &outputFormat, NULL, kAudioFileFlags_EraseFile, &mixFile);
ExtAudioFileSetProperty(mixFile, kExtAudioFileProperty_ClientDataFormat, sizeof(inputFormat), &inputFormat);
//Freeing URLs
CFRelease(micUrl);
CFRelease(speakerUrl);
CFRelease(mixUrl);
//Setting up audio buffers
int bufferSizeInSamples = 64 * 1024;
AudioBufferList micBuffer;
micBuffer.mNumberBuffers = 1;
micBuffer.mBuffers[0].mNumberChannels = 1;
micBuffer.mBuffers[0].mDataByteSize = sampleSize * bufferSizeInSamples;
micBuffer.mBuffers[0].mData = malloc(micBuffer.mBuffers[0].mDataByteSize);
AudioBufferList speakerBuffer;
speakerBuffer.mNumberBuffers = 1;
speakerBuffer.mBuffers[0].mNumberChannels = 1;
speakerBuffer.mBuffers[0].mDataByteSize = sampleSize * bufferSizeInSamples;
speakerBuffer.mBuffers[0].mData = malloc(speakerBuffer.mBuffers[0].mDataByteSize);
AudioBufferList mixBuffer;
mixBuffer.mNumberBuffers = 1;
mixBuffer.mBuffers[0].mNumberChannels = 2;
mixBuffer.mBuffers[0].mDataByteSize = sampleSize * bufferSizeInSamples * 2;
mixBuffer.mBuffers[0].mData = malloc(mixBuffer.mBuffers[0].mDataByteSize);
//Converting
while (true)
{
//Reading data from input files
UInt32 framesToRead = bufferSizeInSamples;
ExtAudioFileRead(micFile, &framesToRead, &micBuffer);
ExtAudioFileRead(speakerFile, &framesToRead, &speakerBuffer);
if (framesToRead == 0)
{
break;
}
//Building interleaved stereo buffer - left channel is mic, right - speaker
for (int i = 0; i < framesToRead; i++)
{
memcpy((char*)mixBuffer.mBuffers[0].mData + i * sampleSize * 2, (char*)micBuffer.mBuffers[0].mData + i * sampleSize, sampleSize);
memcpy((char*)mixBuffer.mBuffers[0].mData + i * sampleSize * 2 + sampleSize, (char*)speakerBuffer.mBuffers[0].mData + i * sampleSize, sampleSize);
}
//Writing to output file - LPCM will be converted to AAC
ExtAudioFileWrite(mixFile, framesToRead, &mixBuffer);
}
//Closing files
ExtAudioFileDispose(micFile);
ExtAudioFileDispose(speakerFile);
ExtAudioFileDispose(mixFile);
//Freeing audio buffers
free(micBuffer.mBuffers[0].mData);
free(speakerBuffer.mBuffers[0].mData);
free(mixBuffer.mBuffers[0].mData);
}
void Cleanup()
{
[[NSFileManager defaultManager] removeItemAtPath:kMicFilePath error:NULL];
[[NSFileManager defaultManager] removeItemAtPath:kSpeakerFilePath error:NULL];
}
void CoreTelephonyNotificationCallback(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo)
{
NSDictionary* data = (NSDictionary*)userInfo;
if ([(NSString*)name isEqualToString:(NSString*)kCTCallStatusChangeNotification])
{
int currentCallStatus = [data[(NSString*)kCTCallStatus] integerValue];
if (currentCallStatus == kCTCallStatusActive)
{
OSSpinLockLock(&phoneCallIsActiveLock);
phoneCallIsActive = YES;
OSSpinLockUnlock(&phoneCallIsActiveLock);
}
else if (currentCallStatus == kCTCallStatusHanged)
{
if (CTGetCurrentCallCount() > 0)
{
return;
}
OSSpinLockLock(&phoneCallIsActiveLock);
phoneCallIsActive = NO;
OSSpinLockUnlock(&phoneCallIsActiveLock);
//Closing mic file
OSSpinLockLock(&micLock);
if (micFile != NULL)
{
ExtAudioFileDispose(micFile);
}
micFile = NULL;
OSSpinLockUnlock(&micLock);
//Closing speaker file
OSSpinLockLock(&speakerLock);
if (speakerFile != NULL)
{
ExtAudioFileDispose(speakerFile);
}
speakerFile = NULL;
OSSpinLockUnlock(&speakerLock);
Convert();
Cleanup();
}
}
}
OSStatus(*AudioUnitProcess_orig)(AudioUnit unit, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inNumberFrames, AudioBufferList *ioData);
OSStatus AudioUnitProcess_hook(AudioUnit unit, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inNumberFrames, AudioBufferList *ioData)
{
OSSpinLockLock(&phoneCallIsActiveLock);
if (phoneCallIsActive == NO)
{
OSSpinLockUnlock(&phoneCallIsActiveLock);
return AudioUnitProcess_orig(unit, ioActionFlags, inTimeStamp, inNumberFrames, ioData);
}
OSSpinLockUnlock(&phoneCallIsActiveLock);
ExtAudioFileRef* currentFile = NULL;
OSSpinLock* currentLock = NULL;
AudioComponentDescription unitDescription = {0};
AudioComponentGetDescription(AudioComponentInstanceGetComponent(unit), &unitDescription);
//'agcc', 'mbdp' - iPhone 4S, iPhone 5
//'agc2', 'vrq2' - iPhone 5C, iPhone 5S
if (unitDescription.componentSubType == 'agcc' || unitDescription.componentSubType == 'agc2')
{
currentFile = &micFile;
currentLock = &micLock;
}
else if (unitDescription.componentSubType == 'mbdp' || unitDescription.componentSubType == 'vrq2')
{
currentFile = &speakerFile;
currentLock = &speakerLock;
}
if (currentFile != NULL)
{
OSSpinLockLock(currentLock);
//Opening file
if (*currentFile == NULL)
{
//Obtaining input audio format
AudioStreamBasicDescription desc;
UInt32 descSize = sizeof(desc);
AudioUnitGetProperty(unit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &desc, &descSize);
//Opening audio file
CFURLRef url = CFURLCreateWithFileSystemPath(NULL, (CFStringRef)((currentFile == &micFile) ? kMicFilePath : kSpeakerFilePath), kCFURLPOSIXPathStyle, false);
ExtAudioFileRef audioFile = NULL;
OSStatus result = ExtAudioFileCreateWithURL(url, kAudioFileCAFType, &desc, NULL, kAudioFileFlags_EraseFile, &audioFile);
if (result != 0)
{
*currentFile = NULL;
}
else
{
*currentFile = audioFile;
//Writing audio format
ExtAudioFileSetProperty(*currentFile, kExtAudioFileProperty_ClientDataFormat, sizeof(desc), &desc);
}
CFRelease(url);
}
else
{
//Writing audio buffer
ExtAudioFileWrite(*currentFile, inNumberFrames, ioData);
}
OSSpinLockUnlock(currentLock);
}
return AudioUnitProcess_orig(unit, ioActionFlags, inTimeStamp, inNumberFrames, ioData);
}
__attribute__((constructor))
static void initialize()
{
CTTelephonyCenterAddObserver(CTTelephonyCenterGetDefault(), NULL, CoreTelephonyNotificationCallback, NULL, NULL, CFNotificationSuspensionBehaviorHold);
MSHookFunction(AudioUnitProcess, AudioUnitProcess_hook, &AudioUnitProcess_orig);
}
A few words about what's going on. AudioUnitProcess function is used for processing audio streams in order to apply some effects, mix, convert etc. We are hooking AudioUnitProcess in order to access phone call's audio streams. While phone call is active these streams are being processed in various ways.
We are listening for CoreTelephony notifications in order to get phone call status changes. When we receive audio samples we need to determine where they come from - microphone or speaker. This is done using componentSubType field in AudioComponentDescription structure. Now, you might think, why don't we store AudioUnit objects so that we don't need to check componentSubType every time. I did that but it will break everything when you switch speaker on/off on iPhone 5 because AudioUnit objects will change, they are recreated. So, now we open audio files (one for microphone and one for speaker) and write samples in them, simple as that. When phone call ends we will receive appropriate CoreTelephony notification and close the files. We have two separate files with audio from microphone and speaker that we need to merge. This is what void Convert() is for. It's pretty simple if you know the API. I don't think I need to explain it, comments are enough.
About locks. There are many threads in mediaserverd. Audio processing and CoreTelephony notifications are on different threads so we need some kind synchronization. I chose spin locks because they are fast and because the chance of lock contention is small in our case. On iPhone 4S and even iPhone 5 all the work in AudioUnitProcess should be done as fast as possible otherwise you will hear hiccups from device speaker which obviously not good.
Yes. Audio Recorder by a developer named Limneos does that (and quite well). You can find it on Cydia. It can record any type of call on iPhone 5 and up without using any servers etc'. The call will be placed on the device in an Audio file. It also supports iPhone 4S but for speaker only.
This tweak is known to be the first tweak ever that managed to record both streams of audio without using any 3rd party severs, VOIP or something similar.
The developer placed beeps on the other side of the call to alert the person you are recording but those were removed too by hackers across the net. To answer your question, Yes, it's very much possible, and not just theoretically.
Further reading
https://stackoverflow.com/a/19413363/202451
http://forums.macrumors.com/showthread.php?t=1566350
https://github.com/nst/iOS-Runtime-Headers
The only solution I can think of is to use the Core Telephony framework, and more specifically the callEventHandler property, to intercept when a call is coming in, and then to use an AVAudioRecorder to record the voice of the person with the phone (and maybe a little of the person on the other line's voice). This is obviously not perfect, and would only work if your application is in the foreground at the time of the call, but it may be the best you can get. See more about finding out if there is an incoming phone call here: Can we fire an event when ever there is Incoming and Outgoing call in iphone?.
EDIT:
.h:
#import <AVFoundation/AVFoundation.h>
#import<CoreTelephony/CTCallCenter.h>
#import<CoreTelephony/CTCall.h>
#property (strong, nonatomic) AVAudioRecorder *audioRecorder;
ViewDidLoad:
NSArray *dirPaths;
NSString *docsDir;
dirPaths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
NSString *soundFilePath = [docsDir
stringByAppendingPathComponent:#"sound.caf"];
NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];
NSDictionary *recordSettings = [NSDictionary
dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:AVAudioQualityMin],
AVEncoderAudioQualityKey,
[NSNumber numberWithInt:16],
AVEncoderBitRateKey,
[NSNumber numberWithInt: 2],
AVNumberOfChannelsKey,
[NSNumber numberWithFloat:44100.0],
AVSampleRateKey,
nil];
NSError *error = nil;
_audioRecorder = [[AVAudioRecorder alloc]
initWithURL:soundFileURL
settings:recordSettings
error:&error];
if (error)
{
NSLog(#"error: %#", [error localizedDescription]);
} else {
[_audioRecorder prepareToRecord];
}
CTCallCenter *callCenter = [[CTCallCenter alloc] init];
[callCenter setCallEventHandler:^(CTCall *call) {
if ([[call callState] isEqual:CTCallStateConnected]) {
[_audioRecorder record];
} else if ([[call callState] isEqual:CTCallStateDisconnected]) {
[_audioRecorder stop];
}
}];
AppDelegate.m:
- (void)applicationDidEnterBackground:(UIApplication *)application//Makes sure that the recording keeps happening even when app is in the background, though only can go for 10 minutes.
{
__block UIBackgroundTaskIdentifier task = 0;
task=[application beginBackgroundTaskWithExpirationHandler:^{
NSLog(#"Expiration handler called %f",[application backgroundTimeRemaining]);
[application endBackgroundTask:task];
task=UIBackgroundTaskInvalid;
}];
This is the first time using many of these features, so not sure if this is exactly right, but I think you get the idea. Untested, as I do not have access to the right tools at the moment. Compiled using these sources:
Recording voice in background using AVAudioRecorder
http://prassan-warrior.blogspot.com/2012/11/recording-audio-on-iphone-with.html
Can we fire an event when ever there is Incoming and Outgoing call in iphone?
Apple does not allow it and does not provide any API for it.
However, on a jailbroken device I'm sure it's possible. As a matter of fact, I think it's already done. I remember seeing an app when my phone was jailbroken that changed your voice and recorded the call - I remember it was a US company offering it only in the states. Unfortunately I don't remember the name...
I guess some hardware could solve this. Connected to the minijack-port; having earbuds and a microphone passing through a small recorder. This recorder can be very simple. While not in conversation the recorder could feed the phone with data/the recording (through the jack-cable). And with a simple start button (just like the volum controls on the earbuds) could be sufficient for timing the recording.
Some setups
http://www.danmccomb.com/posts/483/how-to-record-iphone-conversations-using-zoom-h4n/
http://forums.macrumors.com/showthread.php?t=346430
I writing an iOS app that needs to identify periods of silence within an mp3 file downloaded from the internet.
Downloading and playing via AVAudioPlayer is no problem but I can't figure out how to get access to the actual audio frame data within the mp3 so that I can detect sound levels in order to detect silences. I've tried :-
NSURL *fileUrl = [[NSURL alloc] initFileURLWithPath:[self filename]];
ExtAudioFileRef eaf;
OSStatus err = ExtAudioFileOpenURL((CFURLRef)CFBridgingRetain(fileUrl), &eaf);
if (noErr != err)
{
/* handle error */
exit(-1);
}
AudioStreamBasicDescription format;
format.mSampleRate = 44100;
format.mFormatID = kAudioFormatLinearPCM;
format.mFormatFlags = kAudioFormatFlagsNativeEndian;
format.mBitsPerChannel = 16;
format.mChannelsPerFrame = 2;
format.mBytesPerFrame = format.mChannelsPerFrame * 2;
format.mFramesPerPacket = 1;
format.mBytesPerPacket = format.mFramesPerPacket * format.mBytesPerFrame;
err = ExtAudioFileSetProperty(eaf, kExtAudioFileProperty_ClientDataFormat, sizeof(format), &format);
if (noErr != err)
{
/* handle error */
NSLog(#"Error: %d", err);
exit(-1);
}
But it fails on the set property with error 1718449215, so I'm assuming that it won't allow me to convert from MP3 to PCM. I want to be able to preprocess the files so that I know where the silences are going to occur before playback by the user.
Any suggestions would be greatly appreciated.
Thanks.
You can use the AVAssetReader and AVAssetWriter APIs to convert an mp3 file into raw PCM (or .wav) data.
Is it theoretically possible to record a phone call on iPhone?
I'm accepting answers which:
may or may not require the phone to be jailbroken
may or may not pass apple's guidelines due to use of private API's (I don't care; it is not for the App Store)
may or may not use private SDKs
I don't want answers just bluntly saying "Apple does not allow that".
I know there would be no official way of doing it, and certainly not for an App Store application, and I know there are call recording apps which place outgoing calls through their own servers.
Here you go. Complete working example. Tweak should be loaded in mediaserverd daemon. It will record every phone call in /var/mobile/Media/DCIM/result.m4a. Audio file has two channels. Left is microphone, right is speaker. On iPhone 4S call is recorded only when the speaker is turned on. On iPhone 5, 5C and 5S call is recorded either way. There might be small hiccups when switching to/from speaker but recording will continue.
#import <AudioToolbox/AudioToolbox.h>
#import <libkern/OSAtomic.h>
//CoreTelephony.framework
extern "C" CFStringRef const kCTCallStatusChangeNotification;
extern "C" CFStringRef const kCTCallStatus;
extern "C" id CTTelephonyCenterGetDefault();
extern "C" void CTTelephonyCenterAddObserver(id ct, void* observer, CFNotificationCallback callBack, CFStringRef name, void *object, CFNotificationSuspensionBehavior sb);
extern "C" int CTGetCurrentCallCount();
enum
{
kCTCallStatusActive = 1,
kCTCallStatusHeld = 2,
kCTCallStatusOutgoing = 3,
kCTCallStatusIncoming = 4,
kCTCallStatusHanged = 5
};
NSString* kMicFilePath = #"/var/mobile/Media/DCIM/mic.caf";
NSString* kSpeakerFilePath = #"/var/mobile/Media/DCIM/speaker.caf";
NSString* kResultFilePath = #"/var/mobile/Media/DCIM/result.m4a";
OSSpinLock phoneCallIsActiveLock = 0;
OSSpinLock speakerLock = 0;
OSSpinLock micLock = 0;
ExtAudioFileRef micFile = NULL;
ExtAudioFileRef speakerFile = NULL;
BOOL phoneCallIsActive = NO;
void Convert()
{
//File URLs
CFURLRef micUrl = CFURLCreateWithFileSystemPath(NULL, (CFStringRef)kMicFilePath, kCFURLPOSIXPathStyle, false);
CFURLRef speakerUrl = CFURLCreateWithFileSystemPath(NULL, (CFStringRef)kSpeakerFilePath, kCFURLPOSIXPathStyle, false);
CFURLRef mixUrl = CFURLCreateWithFileSystemPath(NULL, (CFStringRef)kResultFilePath, kCFURLPOSIXPathStyle, false);
ExtAudioFileRef micFile = NULL;
ExtAudioFileRef speakerFile = NULL;
ExtAudioFileRef mixFile = NULL;
//Opening input files (speaker and mic)
ExtAudioFileOpenURL(micUrl, &micFile);
ExtAudioFileOpenURL(speakerUrl, &speakerFile);
//Reading input file audio format (mono LPCM)
AudioStreamBasicDescription inputFormat, outputFormat;
UInt32 descSize = sizeof(inputFormat);
ExtAudioFileGetProperty(micFile, kExtAudioFileProperty_FileDataFormat, &descSize, &inputFormat);
int sampleSize = inputFormat.mBytesPerFrame;
//Filling input stream format for output file (stereo LPCM)
FillOutASBDForLPCM(inputFormat, inputFormat.mSampleRate, 2, inputFormat.mBitsPerChannel, inputFormat.mBitsPerChannel, true, false, false);
//Filling output file audio format (AAC)
memset(&outputFormat, 0, sizeof(outputFormat));
outputFormat.mFormatID = kAudioFormatMPEG4AAC;
outputFormat.mSampleRate = 8000;
outputFormat.mFormatFlags = kMPEG4Object_AAC_Main;
outputFormat.mChannelsPerFrame = 2;
//Opening output file
ExtAudioFileCreateWithURL(mixUrl, kAudioFileM4AType, &outputFormat, NULL, kAudioFileFlags_EraseFile, &mixFile);
ExtAudioFileSetProperty(mixFile, kExtAudioFileProperty_ClientDataFormat, sizeof(inputFormat), &inputFormat);
//Freeing URLs
CFRelease(micUrl);
CFRelease(speakerUrl);
CFRelease(mixUrl);
//Setting up audio buffers
int bufferSizeInSamples = 64 * 1024;
AudioBufferList micBuffer;
micBuffer.mNumberBuffers = 1;
micBuffer.mBuffers[0].mNumberChannels = 1;
micBuffer.mBuffers[0].mDataByteSize = sampleSize * bufferSizeInSamples;
micBuffer.mBuffers[0].mData = malloc(micBuffer.mBuffers[0].mDataByteSize);
AudioBufferList speakerBuffer;
speakerBuffer.mNumberBuffers = 1;
speakerBuffer.mBuffers[0].mNumberChannels = 1;
speakerBuffer.mBuffers[0].mDataByteSize = sampleSize * bufferSizeInSamples;
speakerBuffer.mBuffers[0].mData = malloc(speakerBuffer.mBuffers[0].mDataByteSize);
AudioBufferList mixBuffer;
mixBuffer.mNumberBuffers = 1;
mixBuffer.mBuffers[0].mNumberChannels = 2;
mixBuffer.mBuffers[0].mDataByteSize = sampleSize * bufferSizeInSamples * 2;
mixBuffer.mBuffers[0].mData = malloc(mixBuffer.mBuffers[0].mDataByteSize);
//Converting
while (true)
{
//Reading data from input files
UInt32 framesToRead = bufferSizeInSamples;
ExtAudioFileRead(micFile, &framesToRead, &micBuffer);
ExtAudioFileRead(speakerFile, &framesToRead, &speakerBuffer);
if (framesToRead == 0)
{
break;
}
//Building interleaved stereo buffer - left channel is mic, right - speaker
for (int i = 0; i < framesToRead; i++)
{
memcpy((char*)mixBuffer.mBuffers[0].mData + i * sampleSize * 2, (char*)micBuffer.mBuffers[0].mData + i * sampleSize, sampleSize);
memcpy((char*)mixBuffer.mBuffers[0].mData + i * sampleSize * 2 + sampleSize, (char*)speakerBuffer.mBuffers[0].mData + i * sampleSize, sampleSize);
}
//Writing to output file - LPCM will be converted to AAC
ExtAudioFileWrite(mixFile, framesToRead, &mixBuffer);
}
//Closing files
ExtAudioFileDispose(micFile);
ExtAudioFileDispose(speakerFile);
ExtAudioFileDispose(mixFile);
//Freeing audio buffers
free(micBuffer.mBuffers[0].mData);
free(speakerBuffer.mBuffers[0].mData);
free(mixBuffer.mBuffers[0].mData);
}
void Cleanup()
{
[[NSFileManager defaultManager] removeItemAtPath:kMicFilePath error:NULL];
[[NSFileManager defaultManager] removeItemAtPath:kSpeakerFilePath error:NULL];
}
void CoreTelephonyNotificationCallback(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo)
{
NSDictionary* data = (NSDictionary*)userInfo;
if ([(NSString*)name isEqualToString:(NSString*)kCTCallStatusChangeNotification])
{
int currentCallStatus = [data[(NSString*)kCTCallStatus] integerValue];
if (currentCallStatus == kCTCallStatusActive)
{
OSSpinLockLock(&phoneCallIsActiveLock);
phoneCallIsActive = YES;
OSSpinLockUnlock(&phoneCallIsActiveLock);
}
else if (currentCallStatus == kCTCallStatusHanged)
{
if (CTGetCurrentCallCount() > 0)
{
return;
}
OSSpinLockLock(&phoneCallIsActiveLock);
phoneCallIsActive = NO;
OSSpinLockUnlock(&phoneCallIsActiveLock);
//Closing mic file
OSSpinLockLock(&micLock);
if (micFile != NULL)
{
ExtAudioFileDispose(micFile);
}
micFile = NULL;
OSSpinLockUnlock(&micLock);
//Closing speaker file
OSSpinLockLock(&speakerLock);
if (speakerFile != NULL)
{
ExtAudioFileDispose(speakerFile);
}
speakerFile = NULL;
OSSpinLockUnlock(&speakerLock);
Convert();
Cleanup();
}
}
}
OSStatus(*AudioUnitProcess_orig)(AudioUnit unit, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inNumberFrames, AudioBufferList *ioData);
OSStatus AudioUnitProcess_hook(AudioUnit unit, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inNumberFrames, AudioBufferList *ioData)
{
OSSpinLockLock(&phoneCallIsActiveLock);
if (phoneCallIsActive == NO)
{
OSSpinLockUnlock(&phoneCallIsActiveLock);
return AudioUnitProcess_orig(unit, ioActionFlags, inTimeStamp, inNumberFrames, ioData);
}
OSSpinLockUnlock(&phoneCallIsActiveLock);
ExtAudioFileRef* currentFile = NULL;
OSSpinLock* currentLock = NULL;
AudioComponentDescription unitDescription = {0};
AudioComponentGetDescription(AudioComponentInstanceGetComponent(unit), &unitDescription);
//'agcc', 'mbdp' - iPhone 4S, iPhone 5
//'agc2', 'vrq2' - iPhone 5C, iPhone 5S
if (unitDescription.componentSubType == 'agcc' || unitDescription.componentSubType == 'agc2')
{
currentFile = &micFile;
currentLock = &micLock;
}
else if (unitDescription.componentSubType == 'mbdp' || unitDescription.componentSubType == 'vrq2')
{
currentFile = &speakerFile;
currentLock = &speakerLock;
}
if (currentFile != NULL)
{
OSSpinLockLock(currentLock);
//Opening file
if (*currentFile == NULL)
{
//Obtaining input audio format
AudioStreamBasicDescription desc;
UInt32 descSize = sizeof(desc);
AudioUnitGetProperty(unit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &desc, &descSize);
//Opening audio file
CFURLRef url = CFURLCreateWithFileSystemPath(NULL, (CFStringRef)((currentFile == &micFile) ? kMicFilePath : kSpeakerFilePath), kCFURLPOSIXPathStyle, false);
ExtAudioFileRef audioFile = NULL;
OSStatus result = ExtAudioFileCreateWithURL(url, kAudioFileCAFType, &desc, NULL, kAudioFileFlags_EraseFile, &audioFile);
if (result != 0)
{
*currentFile = NULL;
}
else
{
*currentFile = audioFile;
//Writing audio format
ExtAudioFileSetProperty(*currentFile, kExtAudioFileProperty_ClientDataFormat, sizeof(desc), &desc);
}
CFRelease(url);
}
else
{
//Writing audio buffer
ExtAudioFileWrite(*currentFile, inNumberFrames, ioData);
}
OSSpinLockUnlock(currentLock);
}
return AudioUnitProcess_orig(unit, ioActionFlags, inTimeStamp, inNumberFrames, ioData);
}
__attribute__((constructor))
static void initialize()
{
CTTelephonyCenterAddObserver(CTTelephonyCenterGetDefault(), NULL, CoreTelephonyNotificationCallback, NULL, NULL, CFNotificationSuspensionBehaviorHold);
MSHookFunction(AudioUnitProcess, AudioUnitProcess_hook, &AudioUnitProcess_orig);
}
A few words about what's going on. AudioUnitProcess function is used for processing audio streams in order to apply some effects, mix, convert etc. We are hooking AudioUnitProcess in order to access phone call's audio streams. While phone call is active these streams are being processed in various ways.
We are listening for CoreTelephony notifications in order to get phone call status changes. When we receive audio samples we need to determine where they come from - microphone or speaker. This is done using componentSubType field in AudioComponentDescription structure. Now, you might think, why don't we store AudioUnit objects so that we don't need to check componentSubType every time. I did that but it will break everything when you switch speaker on/off on iPhone 5 because AudioUnit objects will change, they are recreated. So, now we open audio files (one for microphone and one for speaker) and write samples in them, simple as that. When phone call ends we will receive appropriate CoreTelephony notification and close the files. We have two separate files with audio from microphone and speaker that we need to merge. This is what void Convert() is for. It's pretty simple if you know the API. I don't think I need to explain it, comments are enough.
About locks. There are many threads in mediaserverd. Audio processing and CoreTelephony notifications are on different threads so we need some kind synchronization. I chose spin locks because they are fast and because the chance of lock contention is small in our case. On iPhone 4S and even iPhone 5 all the work in AudioUnitProcess should be done as fast as possible otherwise you will hear hiccups from device speaker which obviously not good.
Yes. Audio Recorder by a developer named Limneos does that (and quite well). You can find it on Cydia. It can record any type of call on iPhone 5 and up without using any servers etc'. The call will be placed on the device in an Audio file. It also supports iPhone 4S but for speaker only.
This tweak is known to be the first tweak ever that managed to record both streams of audio without using any 3rd party severs, VOIP or something similar.
The developer placed beeps on the other side of the call to alert the person you are recording but those were removed too by hackers across the net. To answer your question, Yes, it's very much possible, and not just theoretically.
Further reading
https://stackoverflow.com/a/19413363/202451
http://forums.macrumors.com/showthread.php?t=1566350
https://github.com/nst/iOS-Runtime-Headers
The only solution I can think of is to use the Core Telephony framework, and more specifically the callEventHandler property, to intercept when a call is coming in, and then to use an AVAudioRecorder to record the voice of the person with the phone (and maybe a little of the person on the other line's voice). This is obviously not perfect, and would only work if your application is in the foreground at the time of the call, but it may be the best you can get. See more about finding out if there is an incoming phone call here: Can we fire an event when ever there is Incoming and Outgoing call in iphone?.
EDIT:
.h:
#import <AVFoundation/AVFoundation.h>
#import<CoreTelephony/CTCallCenter.h>
#import<CoreTelephony/CTCall.h>
#property (strong, nonatomic) AVAudioRecorder *audioRecorder;
ViewDidLoad:
NSArray *dirPaths;
NSString *docsDir;
dirPaths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
NSString *soundFilePath = [docsDir
stringByAppendingPathComponent:#"sound.caf"];
NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];
NSDictionary *recordSettings = [NSDictionary
dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:AVAudioQualityMin],
AVEncoderAudioQualityKey,
[NSNumber numberWithInt:16],
AVEncoderBitRateKey,
[NSNumber numberWithInt: 2],
AVNumberOfChannelsKey,
[NSNumber numberWithFloat:44100.0],
AVSampleRateKey,
nil];
NSError *error = nil;
_audioRecorder = [[AVAudioRecorder alloc]
initWithURL:soundFileURL
settings:recordSettings
error:&error];
if (error)
{
NSLog(#"error: %#", [error localizedDescription]);
} else {
[_audioRecorder prepareToRecord];
}
CTCallCenter *callCenter = [[CTCallCenter alloc] init];
[callCenter setCallEventHandler:^(CTCall *call) {
if ([[call callState] isEqual:CTCallStateConnected]) {
[_audioRecorder record];
} else if ([[call callState] isEqual:CTCallStateDisconnected]) {
[_audioRecorder stop];
}
}];
AppDelegate.m:
- (void)applicationDidEnterBackground:(UIApplication *)application//Makes sure that the recording keeps happening even when app is in the background, though only can go for 10 minutes.
{
__block UIBackgroundTaskIdentifier task = 0;
task=[application beginBackgroundTaskWithExpirationHandler:^{
NSLog(#"Expiration handler called %f",[application backgroundTimeRemaining]);
[application endBackgroundTask:task];
task=UIBackgroundTaskInvalid;
}];
This is the first time using many of these features, so not sure if this is exactly right, but I think you get the idea. Untested, as I do not have access to the right tools at the moment. Compiled using these sources:
Recording voice in background using AVAudioRecorder
http://prassan-warrior.blogspot.com/2012/11/recording-audio-on-iphone-with.html
Can we fire an event when ever there is Incoming and Outgoing call in iphone?
Apple does not allow it and does not provide any API for it.
However, on a jailbroken device I'm sure it's possible. As a matter of fact, I think it's already done. I remember seeing an app when my phone was jailbroken that changed your voice and recorded the call - I remember it was a US company offering it only in the states. Unfortunately I don't remember the name...
I guess some hardware could solve this. Connected to the minijack-port; having earbuds and a microphone passing through a small recorder. This recorder can be very simple. While not in conversation the recorder could feed the phone with data/the recording (through the jack-cable). And with a simple start button (just like the volum controls on the earbuds) could be sufficient for timing the recording.
Some setups
http://www.danmccomb.com/posts/483/how-to-record-iphone-conversations-using-zoom-h4n/
http://forums.macrumors.com/showthread.php?t=346430