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@ -1,344 +0,0 @@
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//
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//---------------------------------------------------------------------------
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//
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// MIDI device for Apple's macOS using AudioToolbox framework
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// Copyright(C) 2017 Alexey Lysiuk
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// All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see http://www.gnu.org/licenses/
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//
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//--------------------------------------------------------------------------
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//
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// Implementation is loosely based on macOS native MIDI support from SDL_mixer
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#ifdef __APPLE__
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#include <AudioToolbox/AudioToolbox.h>
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#include "i_musicinterns.h"
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#include "templates.h"
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// AudioToolbox implementation of a MIDI output device ----------------------
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class AudioToolboxMIDIDevice : public MIDIDevice
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{
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public:
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virtual int Open(MidiCallback, void *userData) override;
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virtual void Close() override;
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virtual bool IsOpen() const override;
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virtual int GetTechnology() const override;
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virtual int SetTempo(int tempo) override;
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virtual int SetTimeDiv(int timediv) override;
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virtual int StreamOut(MidiHeader *data) override;
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virtual int StreamOutSync(MidiHeader *data) override;
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virtual int Resume() override;
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virtual void Stop() override;
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virtual int PrepareHeader(MidiHeader* data) override;
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virtual bool FakeVolume() override { return true; }
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virtual bool Pause(bool paused) override;
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virtual bool Preprocess(MIDIStreamer *song, bool looping) override;
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private:
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MusicPlayer m_player = nullptr;
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MusicSequence m_sequence = nullptr;
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AudioUnit m_audioUnit = nullptr;
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CFRunLoopTimerRef m_timer = nullptr;
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MusicTimeStamp m_length = 0;
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MidiCallback m_callback = nullptr;
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void* m_userData = nullptr;
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static void TimerCallback(CFRunLoopTimerRef timer, void* info);
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};
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#define AT_MIDI_CHECK_ERROR(CALL,...) \
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{ \
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const OSStatus result = CALL; \
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if (noErr != result) \
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{ \
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DPrintf(DMSG_ERROR, \
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"Failed with error 0x%08X at " __FILE__ ":%d:\n> %s", \
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int(result), __LINE__, #CALL); \
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return __VA_ARGS__; \
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} \
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}
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int AudioToolboxMIDIDevice::Open(MidiCallback callback, void *userData)
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{
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AT_MIDI_CHECK_ERROR(NewMusicPlayer(&m_player), false);
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AT_MIDI_CHECK_ERROR(NewMusicSequence(&m_sequence), false);
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AT_MIDI_CHECK_ERROR(MusicPlayerSetSequence(m_player, m_sequence), false);
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CFRunLoopTimerContext context = { 0, this, nullptr, nullptr, nullptr };
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m_timer = CFRunLoopTimerCreate(kCFAllocatorDefault, CFAbsoluteTimeGetCurrent(), 0.1, 0, 0, TimerCallback, &context);
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if (nullptr == m_timer)
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{
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DPrintf(DMSG_ERROR, "Failed with create timer for MIDI playback");
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return 1;
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}
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CFRunLoopAddTimer(CFRunLoopGetCurrent(), m_timer, kCFRunLoopDefaultMode);
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m_callback = callback;
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m_userData = userData;
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return 0;
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}
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void AudioToolboxMIDIDevice::Close()
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{
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m_length = 0;
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m_audioUnit = nullptr;
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m_callback = nullptr;
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m_userData = nullptr;
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if (nullptr != m_timer)
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{
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CFRunLoopRemoveTimer(CFRunLoopGetCurrent(), m_timer, kCFRunLoopDefaultMode);
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CFRelease(m_timer);
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m_timer = nullptr;
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}
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if (nullptr != m_sequence)
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{
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DisposeMusicSequence(m_sequence);
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m_sequence = nullptr;
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}
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if (nullptr != m_player)
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{
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DisposeMusicPlayer(m_player);
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m_player = nullptr;
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}
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}
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bool AudioToolboxMIDIDevice::IsOpen() const
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{
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return nullptr != m_player
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&& nullptr != m_sequence
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&& nullptr != m_timer;
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}
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int AudioToolboxMIDIDevice::GetTechnology() const
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{
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return MIDIDEV_SWSYNTH;
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}
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int AudioToolboxMIDIDevice::SetTempo(int tempo)
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{
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return 0;
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}
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int AudioToolboxMIDIDevice::SetTimeDiv(int timediv)
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{
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return 0;
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}
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int AudioToolboxMIDIDevice::StreamOut(MidiHeader* data)
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{
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return 0;
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}
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int AudioToolboxMIDIDevice::StreamOutSync(MidiHeader* data)
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{
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return 0;
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}
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int AudioToolboxMIDIDevice::Resume()
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{
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AT_MIDI_CHECK_ERROR(MusicPlayerSetTime(m_player, 0), false);
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AT_MIDI_CHECK_ERROR(MusicPlayerPreroll(m_player), false);
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if (nullptr == m_audioUnit)
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{
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AUGraph graph;
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AT_MIDI_CHECK_ERROR(MusicSequenceGetAUGraph(m_sequence, &graph), false);
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UInt32 nodecount;
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AT_MIDI_CHECK_ERROR(AUGraphGetNodeCount(graph, &nodecount), false);
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for (UInt32 i = 0; i < nodecount; ++i)
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{
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AUNode node;
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AT_MIDI_CHECK_ERROR(AUGraphGetIndNode(graph, i, &node), false);
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AudioUnit audioUnit = nullptr;
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#if MAC_OS_X_VERSION_MAX_ALLOWED < 1050
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ComponentDescription desc = {};
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UInt32 classdatasize = 0;
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void *classdata = nullptr;
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AT_MIDI_CHECK_ERROR(AUGraphGetNodeInfo(graph, node, &desc, &classdatasize, &classdata, &audioUnit), false);
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#else // 10.5 and above
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AudioComponentDescription desc = {};
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AT_MIDI_CHECK_ERROR(AUGraphNodeInfo(graph, node, &desc, &audioUnit), false);
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#endif // prior to 10.5
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if ( kAudioUnitType_Output != desc.componentType
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|| kAudioUnitSubType_DefaultOutput != desc.componentSubType)
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{
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continue;
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}
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const float volume = clamp<float>(snd_musicvolume * relative_volume, 0.f, 1.f);
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AT_MIDI_CHECK_ERROR(AudioUnitSetParameter(audioUnit, kHALOutputParam_Volume, kAudioUnitScope_Global, 0, volume, 0), false);
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m_audioUnit = audioUnit;
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break;
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}
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}
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AT_MIDI_CHECK_ERROR(MusicPlayerStart(m_player), false);
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return 0;
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}
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void AudioToolboxMIDIDevice::Stop()
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{
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AT_MIDI_CHECK_ERROR(MusicPlayerStop(m_player));
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}
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int AudioToolboxMIDIDevice::PrepareHeader(MidiHeader* data)
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{
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MidiHeader* events = data;
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uint32_t position = 0;
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while (nullptr != events)
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{
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uint32_t* const event = reinterpret_cast<uint32_t*>(events->lpData + position);
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const uint32_t message = event[2];
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if (0 == MEVENT_EVENTTYPE(message))
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{
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static const uint32_t VOLUME_CHANGE_EVENT = 7;
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const uint32_t status = message & 0xFF;
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const uint32_t param1 = (message >> 8) & 0x7F;
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const uint32_t param2 = (message >> 16) & 0x7F;
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if (nullptr != m_audioUnit && MIDI_CTRLCHANGE == status && VOLUME_CHANGE_EVENT == param1)
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{
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AT_MIDI_CHECK_ERROR(AudioUnitSetParameter(m_audioUnit, kHALOutputParam_Volume, kAudioUnitScope_Global, 0, param2 / 100.f, 0), false);
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}
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}
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// Advance to next event
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position += 12 + ( (message < 0x80000000)
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? 0
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: ((MEVENT_EVENTPARM(message) + 3) & ~3) );
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// Did we use up this buffer?
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if (position >= events->dwBytesRecorded)
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{
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events = events->lpNext;
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position = 0;
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}
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if (nullptr == events)
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{
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break;
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}
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}
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return 0;
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}
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bool AudioToolboxMIDIDevice::Pause(bool paused)
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{
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return false;
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}
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static MusicTimeStamp GetSequenceLength(MusicSequence sequence)
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{
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UInt32 trackCount;
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AT_MIDI_CHECK_ERROR(MusicSequenceGetTrackCount(sequence, &trackCount), 0);
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MusicTimeStamp result = 0;
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for (UInt32 i = 0; i < trackCount; ++i)
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{
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MusicTrack track;
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AT_MIDI_CHECK_ERROR(MusicSequenceGetIndTrack(sequence, i, &track), 0);
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MusicTimeStamp trackLength = 0;
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UInt32 trackLengthSize = sizeof trackLength;
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AT_MIDI_CHECK_ERROR(MusicTrackGetProperty(track, kSequenceTrackProperty_TrackLength, &trackLength, &trackLengthSize), 0);
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if (result < trackLength)
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{
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result = trackLength;
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}
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}
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return result;
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}
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bool AudioToolboxMIDIDevice::Preprocess(MIDIStreamer* song, bool looping)
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{
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assert(nullptr != song);
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TArray<uint8_t> midi;
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song->CreateSMF(midi, looping ? 0 : 1);
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CFDataRef data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, &midi[0], midi.Size(), kCFAllocatorNull);
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if (nullptr == data)
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{
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DPrintf(DMSG_ERROR, "Failed with create CFDataRef for MIDI song");
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return false;
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}
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#if MAC_OS_X_VERSION_MAX_ALLOWED < 1050
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AT_MIDI_CHECK_ERROR(MusicSequenceLoadSMFDataWithFlags(m_sequence, data, 0), false);
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#else // 10.5 and above
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AT_MIDI_CHECK_ERROR(MusicSequenceFileLoadData(m_sequence, data, kMusicSequenceFile_MIDIType, 0), CFRelease(data), false);
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#endif // prior to 10.5
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CFRelease(data);
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m_length = GetSequenceLength(m_sequence);
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return true;
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}
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void AudioToolboxMIDIDevice::TimerCallback(CFRunLoopTimerRef timer, void* info)
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{
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AudioToolboxMIDIDevice* const self = static_cast<AudioToolboxMIDIDevice*>(info);
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if (nullptr != self->m_callback)
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{
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self->m_callback(self->m_userData);
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}
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MusicTimeStamp currentTime = 0;
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AT_MIDI_CHECK_ERROR(MusicPlayerGetTime(self->m_player, ¤tTime));
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if (currentTime > self->m_length)
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{
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MusicPlayerSetTime(self->m_player, 0);
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}
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}
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#undef AT_MIDI_CHECK_ERROR
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MIDIDevice *CreateAudioToolboxMIDIDevice()
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{
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return new AudioToolboxMIDIDevice();
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}
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#endif // __APPLE__
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