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Get a human readable `AudioStreamBasicDescription` description.
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| -(NSString*)descriptionForAudioFormat:(AudioStreamBasicDescription) audioFormat | |
| { | |
| NSMutableString *description = [NSMutableString new]; | |
| // From https://developer.apple.com/library/ios/documentation/MusicAudio/Conceptual/AudioUnitHostingGuide_iOS/ConstructingAudioUnitApps/ConstructingAudioUnitApps.html (Listing 2-8) | |
| char formatIDString[5]; | |
| UInt32 formatID = CFSwapInt32HostToBig (audioFormat.mFormatID); | |
| bcopy (&formatID, formatIDString, 4); | |
| formatIDString[4] = '\0'; | |
| [description appendFormat:@"Sample Rate: %10.0f \n", audioFormat.mSampleRate]; | |
| [description appendFormat:@"Format ID: %10s \n", formatIDString]; | |
| [description appendFormat:@"Format Flags: %10X \n", (unsigned int)audioFormat.mFormatFlags]; | |
| [description appendFormat:@"Bytes per Packet: %10d \n", (unsigned int)audioFormat.mBytesPerPacket]; | |
| [description appendFormat:@"Frames per Packet: %10d \n", (unsigned int)audioFormat.mFramesPerPacket]; | |
| [description appendFormat:@"Bytes per Frame: %10d \n", (unsigned int)audioFormat.mBytesPerFrame]; | |
| [description appendFormat:@"Channels per Frame: %10d \n", (unsigned int)audioFormat.mChannelsPerFrame]; | |
| [description appendFormat:@"Bits per Channel: %10d \n", (unsigned int)audioFormat.mBitsPerChannel]; | |
| // Add flags (supposing standard flags). | |
| [description appendString:[self descriptionForStandardFlags:audioFormat.mFormatFlags]]; | |
| return [NSString stringWithString:description]; | |
| } | |
| -(NSString*)descriptionForStandardFlags:(UInt32) mFormatFlags | |
| { | |
| NSMutableString *description = [NSMutableString new]; | |
| if (mFormatFlags & kAudioFormatFlagIsFloat) | |
| { [description appendString:@"kAudioFormatFlagIsFloat \n"]; } | |
| if (mFormatFlags & kAudioFormatFlagIsBigEndian) | |
| { [description appendString:@"kAudioFormatFlagIsBigEndian \n"]; } | |
| if (mFormatFlags & kAudioFormatFlagIsSignedInteger) | |
| { [description appendString:@"kAudioFormatFlagIsSignedInteger \n"]; } | |
| if (mFormatFlags & kAudioFormatFlagIsPacked) | |
| { [description appendString:@"kAudioFormatFlagIsPacked \n"]; } | |
| if (mFormatFlags & kAudioFormatFlagIsAlignedHigh) | |
| { [description appendString:@"kAudioFormatFlagIsAlignedHigh \n"]; } | |
| if (mFormatFlags & kAudioFormatFlagIsNonInterleaved) | |
| { [description appendString:@"kAudioFormatFlagIsNonInterleaved \n"]; } | |
| if (mFormatFlags & kAudioFormatFlagIsNonMixable) | |
| { [description appendString:@"kAudioFormatFlagIsNonMixable \n"]; } | |
| if (mFormatFlags & kAudioFormatFlagsAreAllClear) | |
| { [description appendString:@"kAudioFormatFlagsAreAllClear \n"]; } | |
| if (mFormatFlags & kLinearPCMFormatFlagIsFloat) | |
| { [description appendString:@"kLinearPCMFormatFlagIsFloat \n"]; } | |
| if (mFormatFlags & kLinearPCMFormatFlagIsBigEndian) | |
| { [description appendString:@"kLinearPCMFormatFlagIsBigEndian \n"]; } | |
| if (mFormatFlags & kLinearPCMFormatFlagIsSignedInteger) | |
| { [description appendString:@"kLinearPCMFormatFlagIsSignedInteger \n"]; } | |
| if (mFormatFlags & kLinearPCMFormatFlagIsPacked) | |
| { [description appendString:@"kLinearPCMFormatFlagIsPacked \n"]; } | |
| if (mFormatFlags & kLinearPCMFormatFlagIsAlignedHigh) | |
| { [description appendString:@"kLinearPCMFormatFlagIsAlignedHigh \n"]; } | |
| if (mFormatFlags & kLinearPCMFormatFlagIsNonInterleaved) | |
| { [description appendString:@"kLinearPCMFormatFlagIsNonInterleaved \n"]; } | |
| if (mFormatFlags & kLinearPCMFormatFlagIsNonMixable) | |
| { [description appendString:@"kLinearPCMFormatFlagIsNonMixable \n"]; } | |
| if (mFormatFlags & kLinearPCMFormatFlagsSampleFractionShift) | |
| { [description appendString:@"kLinearPCMFormatFlagsSampleFractionShift \n"]; } | |
| if (mFormatFlags & kLinearPCMFormatFlagsSampleFractionMask) | |
| { [description appendString:@"kLinearPCMFormatFlagsSampleFractionMask \n"]; } | |
| if (mFormatFlags & kLinearPCMFormatFlagsAreAllClear) | |
| { [description appendString:@"kLinearPCMFormatFlagsAreAllClear \n"]; } | |
| if (mFormatFlags & kAppleLosslessFormatFlag_16BitSourceData) | |
| { [description appendString:@"kAppleLosslessFormatFlag_16BitSourceData \n"]; } | |
| if (mFormatFlags & kAppleLosslessFormatFlag_20BitSourceData) | |
| { [description appendString:@"kAppleLosslessFormatFlag_20BitSourceData \n"]; } | |
| if (mFormatFlags & kAppleLosslessFormatFlag_24BitSourceData) | |
| { [description appendString:@"kAppleLosslessFormatFlag_24BitSourceData \n"]; } | |
| if (mFormatFlags & kAppleLosslessFormatFlag_32BitSourceData) | |
| { [description appendString:@"kAppleLosslessFormatFlag_32BitSourceData \n"]; } | |
| return [NSString stringWithString:description]; | |
| } |
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It seems we can get a better format if we add a line
"[description appendString:@"\n"];"
at the 10th line of the code.