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223
Kha/Kinc/Backends/System/iOS/Sources/kinc/backend/audio.m.h
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223
Kha/Kinc/Backends/System/iOS/Sources/kinc/backend/audio.m.h
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#import <AudioToolbox/AudioToolbox.h>
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#import <Foundation/Foundation.h>
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#include <kinc/audio2/audio.h>
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#include <kinc/backend/video.h>
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#include <kinc/math/core.h>
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#include <stdio.h>
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#define kOutputBus 0
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static kinc_internal_video_sound_stream_t *video = NULL;
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void iosPlayVideoSoundStream(kinc_internal_video_sound_stream_t *v) {
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video = v;
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}
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void iosStopVideoSoundStream(void) {
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video = NULL;
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}
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static void affirm(OSStatus err) {
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if (err) {
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fprintf(stderr, "Error: %i\n", (int)err);
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}
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}
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static bool initialized;
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static bool soundPlaying;
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static AudioStreamBasicDescription deviceFormat;
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static AudioComponentInstance audioUnit;
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static bool isFloat = false;
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static bool isInterleaved = true;
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static kinc_a2_buffer_t a2_buffer;
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static void copySample(void *buffer, void *secondary_buffer) {
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float left_value = *(float *)&a2_buffer.channels[0][a2_buffer.read_location];
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float right_value = *(float *)&a2_buffer.channels[1][a2_buffer.read_location];
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a2_buffer.read_location += 1;
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if (a2_buffer.read_location >= a2_buffer.data_size) {
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a2_buffer.read_location = 0;
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}
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if (video != NULL) {
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float *frame = kinc_internal_video_sound_stream_next_frame(video);
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left_value += frame[0];
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left_value = kinc_max(kinc_min(left_value, 1.0f), -1.0f);
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right_value += frame[1];
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right_value = kinc_max(kinc_min(right_value, 1.0f), -1.0f);
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if (kinc_internal_video_sound_stream_ended(video)) {
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video = NULL;
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}
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}
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if (secondary_buffer == NULL) {
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if (isFloat) {
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((float *)buffer)[0] = left_value;
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((float *)buffer)[1] = right_value;
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}
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else {
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((int16_t *)buffer)[0] = (int16_t)(left_value * 32767);
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((int16_t *)buffer)[1] = (int16_t)(right_value * 32767);
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}
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}
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else {
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if (isFloat) {
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*(float *)buffer = left_value;
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*(float *)secondary_buffer = right_value;
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}
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else {
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*(int16_t *)buffer = (int16_t)(left_value * 32767);
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*(int16_t *)secondary_buffer = (int16_t)(right_value * 32767);
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}
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}
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}
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static OSStatus renderInput(void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber,
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UInt32 inNumberFrames, AudioBufferList *outOutputData) {
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kinc_a2_internal_callback(&a2_buffer, inNumberFrames);
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if (isInterleaved) {
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if (isFloat) {
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float *output = (float *)outOutputData->mBuffers[0].mData;
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for (int i = 0; i < inNumberFrames; ++i) {
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copySample(output, NULL);
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output += 2;
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}
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}
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else {
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int16_t *output = (int16_t *)outOutputData->mBuffers[0].mData;
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for (int i = 0; i < inNumberFrames; ++i) {
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copySample(output, NULL);
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output += 2;
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}
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}
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}
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else {
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if (isFloat) {
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float *out1 = (float *)outOutputData->mBuffers[0].mData;
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float *out2 = (float *)outOutputData->mBuffers[1].mData;
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for (int i = 0; i < inNumberFrames; ++i) {
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copySample(out1++, out2++);
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}
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}
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else {
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int16_t *out1 = (int16_t *)outOutputData->mBuffers[0].mData;
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int16_t *out2 = (int16_t *)outOutputData->mBuffers[1].mData;
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for (int i = 0; i < inNumberFrames; ++i) {
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copySample(out1++, out2++);
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}
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}
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}
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return noErr;
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}
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static uint32_t samples_per_second = 44100;
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static void sampleRateListener(void *inRefCon, AudioUnit inUnit, AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement) {
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Float64 sampleRate;
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UInt32 size = sizeof(sampleRate);
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affirm(AudioUnitGetProperty(inUnit, kAudioUnitProperty_SampleRate, kAudioUnitScope_Output, 0, &sampleRate, &size));
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if (samples_per_second != (uint32_t)sampleRate) {
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samples_per_second = (uint32_t)sampleRate;
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kinc_a2_internal_sample_rate_callback();
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}
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}
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static bool initialized = false;
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void kinc_a2_init(void) {
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if (initialized) {
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return;
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}
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kinc_a2_internal_init();
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initialized = true;
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a2_buffer.read_location = 0;
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a2_buffer.write_location = 0;
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a2_buffer.data_size = 128 * 1024;
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a2_buffer.channel_count = 2;
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a2_buffer.channels[0] = (float *)malloc(a2_buffer.data_size * sizeof(float));
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a2_buffer.channels[1] = (float *)malloc(a2_buffer.data_size * sizeof(float));
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initialized = false;
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AudioComponentDescription desc;
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desc.componentType = kAudioUnitType_Output;
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desc.componentSubType = kAudioUnitSubType_RemoteIO;
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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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AudioComponent comp = AudioComponentFindNext(NULL, &desc);
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// Get audio units
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affirm(AudioComponentInstanceNew(comp, &audioUnit));
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UInt32 flag = 1;
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affirm(AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Output, kOutputBus, &flag, sizeof(UInt32)));
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if (soundPlaying)
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return;
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affirm(AudioOutputUnitStart(audioUnit));
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UInt32 size = sizeof(AudioStreamBasicDescription);
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affirm(AudioUnitGetProperty(audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 0, &deviceFormat, &size));
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if (deviceFormat.mFormatID != kAudioFormatLinearPCM) {
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fprintf(stderr, "mFormatID != kAudioFormatLinearPCM\n");
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return;
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}
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if (deviceFormat.mFormatFlags & kLinearPCMFormatFlagIsFloat) {
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isFloat = true;
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}
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if (deviceFormat.mFormatFlags & kAudioFormatFlagIsNonInterleaved) {
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isInterleaved = false;
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}
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AudioUnitAddPropertyListener(audioUnit, kAudioUnitProperty_StreamFormat, sampleRateListener, nil);
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initialized = true;
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printf("mSampleRate = %g\n", deviceFormat.mSampleRate);
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printf("mFormatFlags = %08X\n", (unsigned int)deviceFormat.mFormatFlags);
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printf("mBytesPerPacket = %d\n", (unsigned int)deviceFormat.mBytesPerPacket);
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printf("mFramesPerPacket = %d\n", (unsigned int)deviceFormat.mFramesPerPacket);
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printf("mChannelsPerFrame = %d\n", (unsigned int)deviceFormat.mChannelsPerFrame);
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printf("mBytesPerFrame = %d\n", (unsigned int)deviceFormat.mBytesPerFrame);
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printf("mBitsPerChannel = %d\n", (unsigned int)deviceFormat.mBitsPerChannel);
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if (samples_per_second != (uint32_t)deviceFormat.mSampleRate) {
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samples_per_second = (uint32_t)deviceFormat.mSampleRate;
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kinc_a2_internal_sample_rate_callback();
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}
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AURenderCallbackStruct callbackStruct;
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callbackStruct.inputProc = renderInput;
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callbackStruct.inputProcRefCon = NULL;
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affirm(AudioUnitSetProperty(audioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Global, kOutputBus, &callbackStruct, sizeof(callbackStruct)));
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soundPlaying = true;
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}
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void kinc_a2_update(void) {}
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void kinc_a2_shutdown(void) {
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if (!initialized)
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return;
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if (!soundPlaying)
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return;
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affirm(AudioOutputUnitStop(audioUnit));
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soundPlaying = false;
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}
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uint32_t kinc_a2_samples_per_second(void) {
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return samples_per_second;
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}
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