281 lines
7.9 KiB
C++
281 lines
7.9 KiB
C++
/*
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Simple Core Audio backend for osx (and maybe ios?)
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Based off various audio core samples and dolphin's code
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This is part of the Reicast project, please consult the
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LICENSE file for licensing & related information
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This could do with some locking logic to avoid
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race conditions, and some variable length buffer
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logic to support chunk sizes other than 512 bytes
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It does work on my macmini though
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*/
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#if defined(__APPLE__)
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#include "audiostream.h"
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#include "stdclass.h"
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#include <atomic>
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#include <AudioUnit/AudioUnit.h>
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#include <AudioToolbox/AudioQueue.h>
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static AudioUnit audioUnit;
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static u32 BUFSIZE;
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static u8 *samples_temp;
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static std::atomic<int> samples_wptr;
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static std::atomic<int> samples_rptr;
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static cResetEvent bufferEmpty;
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// input buffer and indexes
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static u8 samples_input[2400];
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constexpr size_t InputBufSize = sizeof(samples_input);
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static std::atomic<int> input_wptr;
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static std::atomic<int> input_rptr;
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AudioQueueRef recordQueue;
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static OSStatus coreaudio_callback(void* ctx, AudioUnitRenderActionFlags* flags, const AudioTimeStamp* ts,
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UInt32 bus, UInt32 frames, AudioBufferList* abl)
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{
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for (int i = 0; i < abl->mNumberBuffers; i++)
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{
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int size = abl->mBuffers[i].mDataByteSize;
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u8 *outBuffer = (u8 *)abl->mBuffers[i].mData;
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while (size != 0)
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{
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int avail = (samples_wptr - samples_rptr + BUFSIZE) % BUFSIZE;
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if (avail == 0)
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{
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//printf("Core Audio: buffer underrun %d bytes (%d)", size, abl->mBuffers[i].mDataByteSize);
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memset(outBuffer, '\0', size);
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return noErr;
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}
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avail = std::min(avail, size);
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avail = std::min(avail, (int)BUFSIZE - samples_rptr);
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memcpy(outBuffer, samples_temp + samples_rptr, avail);
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samples_rptr = (samples_rptr + avail) % BUFSIZE;
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size -= avail;
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outBuffer += avail;
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// Set the mutex to allow writing
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bufferEmpty.Set();
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}
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}
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return noErr;
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}
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static void coreaudio_init()
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{
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OSStatus err;
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AURenderCallbackStruct callback_struct;
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AudioStreamBasicDescription format;
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AudioComponentDescription desc;
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AudioComponent component;
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desc.componentType = kAudioUnitType_Output;
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#if !defined(TARGET_IPHONE)
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desc.componentSubType = kAudioUnitSubType_DefaultOutput;
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#else
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desc.componentSubType = kAudioUnitSubType_RemoteIO;
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#endif
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//desc.componentSubType = kAudioUnitSubType_GenericOutput;
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desc.componentFlags = 0;
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desc.componentFlagsMask = 0;
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desc.componentManufacturer = kAudioUnitManufacturer_Apple;
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component = AudioComponentFindNext(nullptr, &desc);
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verify(component != nullptr);
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err = AudioComponentInstanceNew(component, &audioUnit);
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verify(err == noErr);
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FillOutASBDForLPCM(format, 44100,
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2, 16, 16, false, false, false);
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err = AudioUnitSetProperty(audioUnit,
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kAudioUnitProperty_StreamFormat,
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kAudioUnitScope_Input, 0, &format,
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sizeof(AudioStreamBasicDescription));
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verify(err == noErr);
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callback_struct.inputProc = coreaudio_callback;
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callback_struct.inputProcRefCon = 0;
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err = AudioUnitSetProperty(audioUnit,
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kAudioUnitProperty_SetRenderCallback,
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kAudioUnitScope_Input, 0, &callback_struct,
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sizeof callback_struct);
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verify(err == noErr);
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/*
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err = AudioUnitSetParameter(audioUnit,
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kHALOutputParam_Volume,
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kAudioUnitParameterFlag_Output, 0,
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1, 0);
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verify(err == noErr);
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*/
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err = AudioUnitInitialize(audioUnit);
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verify(err == noErr);
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BUFSIZE = config::AudioBufferSize * 4;
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samples_temp = new u8[BUFSIZE]();
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samples_rptr = 0;
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samples_wptr = 0;
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err = AudioOutputUnitStart(audioUnit);
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verify(err == noErr);
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bufferEmpty.Set();
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}
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static u32 coreaudio_push(const void* frame, u32 samples, bool wait)
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{
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int size = samples * 4;
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while (size != 0)
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{
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int avail = (samples_rptr - samples_wptr - 4 + BUFSIZE) % BUFSIZE;
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if (avail == 0)
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{
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if (!wait)
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break;
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bufferEmpty.Wait();
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continue;
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}
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avail = std::min(avail, size);
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avail = std::min(avail, (int)BUFSIZE - samples_wptr);
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memcpy(&samples_temp[samples_wptr], frame, avail);
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samples_wptr = (samples_wptr + avail) % BUFSIZE;
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frame = (u8 *)frame + avail;
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size -= avail;
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}
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return 1;
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}
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static void coreaudio_term()
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{
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AudioOutputUnitStop(audioUnit);
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AudioUnitUninitialize(audioUnit);
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AudioComponentInstanceDispose(audioUnit);
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bufferEmpty.Set();
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delete [] samples_temp;
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}
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static void coreaudio_record_callback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer, const AudioTimeStamp *inStartTime, UInt32 frameSize, const AudioStreamPacketDescription *dataFormat)
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{
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//DEBUG_LOG(AUDIO, "AudioQueue callback: wptr %d rptr %d bytes %d", (int)input_wptr, (int)input_rptr, inBuffer->mAudioDataByteSize);
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UInt32 size = inBuffer->mAudioDataByteSize;
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UInt32 freeSpace = (input_rptr - input_wptr - 2 + InputBufSize) % InputBufSize;
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if (size > freeSpace)
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{
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DEBUG_LOG(AUDIO, "coreaudio: record overrun %d bytes", size - freeSpace);
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size = freeSpace;
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}
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while (size != 0)
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{
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UInt32 chunk = std::min(size, (UInt32)(InputBufSize - input_wptr));
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memcpy(samples_input + input_wptr, inBuffer->mAudioData, chunk);
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input_wptr = (input_wptr + chunk) % InputBufSize;
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size -= chunk;
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}
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AudioQueueEnqueueBuffer(recordQueue, inBuffer, 0, nullptr);
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}
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static void coreaudio_term_record()
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{
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if (recordQueue != nullptr)
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{
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AudioQueueStop(recordQueue, true);
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AudioQueueDispose(recordQueue, true);
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recordQueue = nullptr;
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}
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}
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static bool coreaudio_init_record(u32 sampling_freq)
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{
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AudioStreamBasicDescription desc;
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desc.mFormatID = kAudioFormatLinearPCM;
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desc.mSampleRate = (double)sampling_freq;
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desc.mChannelsPerFrame = 1;
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desc.mBitsPerChannel = 16;
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desc.mBytesPerPacket = desc.mBytesPerFrame = 2;
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desc.mFramesPerPacket = 1;
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desc.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;
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desc.mReserved = 0;
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OSStatus err = AudioQueueNewInput(&desc,
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coreaudio_record_callback,
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nullptr,
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nullptr,
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kCFRunLoopCommonModes,
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0,
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&recordQueue);
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if (err != noErr)
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{
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INFO_LOG(AUDIO, "AudioQueueNewInput failed: %d", err);
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return false;
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}
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AudioQueueBufferRef buffers[2];
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for (UInt32 i = 0; i < ARRAY_SIZE(buffers) && err == noErr; i++)
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{
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err = AudioQueueAllocateBuffer(recordQueue, 480, &buffers[i]);
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if (err == noErr)
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err = AudioQueueEnqueueBuffer(recordQueue, buffers[i], 0, nullptr);
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}
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input_wptr = 0;
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input_rptr = 0;
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if (err == noErr)
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err = AudioQueueStart(recordQueue, nullptr);
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if (err != noErr)
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{
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INFO_LOG(AUDIO, "AudioQueue init failed: %d", err);
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coreaudio_term_record();
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return false;
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}
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DEBUG_LOG(AUDIO, "AudioQueue initialized - sample rate %f", desc.mSampleRate);
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return true;
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}
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static u32 coreaudio_record(void* frame, u32 samples)
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{
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// DEBUG_LOG(AUDIO, "coreaudio_record: wptr %d rptr %d", (int)input_wptr, (int)input_rptr);
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u32 size = samples * 2;
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while (size != 0)
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{
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u32 avail = (input_wptr - input_rptr + InputBufSize) % InputBufSize;
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if (avail == 0)
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{
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DEBUG_LOG(AUDIO, "coreaudio: record underrun %d bytes", size);
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break;
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}
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avail = std::min(avail, size);
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avail = std::min(avail, (u32)(InputBufSize - input_rptr));
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memcpy(frame, &samples_input[input_rptr], avail);
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frame = (u8 *)frame + avail;
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input_rptr = (input_rptr + avail) % InputBufSize;
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size -= avail;
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}
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return samples - size / 2;
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}
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static audiobackend_t audiobackend_coreaudio = {
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"coreaudio", // Slug
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"Core Audio", // Name
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&coreaudio_init,
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&coreaudio_push,
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&coreaudio_term,
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nullptr,
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&coreaudio_init_record,
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&coreaudio_record,
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&coreaudio_term_record
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};
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static bool core = RegisterAudioBackend(&audiobackend_coreaudio);
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#endif
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