Add WAVOut Voice Backend for offline Audio mixing

CMakeLists.txt

@@ -195,6 +195,7 @@ add_library(boo
             lib/inputdev/GenericPad.cpp include/boo/inputdev/GenericPad.hpp
             lib/inputdev/DeviceSignature.cpp include/boo/inputdev/DeviceSignature.hpp
             lib/inputdev/IHIDDevice.hpp
+            lib/audiodev/WAVOut.cpp
             lib/audiodev/AudioMatrix.hpp
             #lib/audiodev/AudioMatrix.cpp
             lib/audiodev/AudioMatrixSSE.cpp

include/boo/audiodev/IAudioVoiceEngine.hpp

@@ -67,11 +67,20 @@ struct IAudioVoiceEngine
 
     /** If this returns true, MIDI callbacks are assumed to be *not* thread-safe; need protection via mutex */
     virtual bool useMIDILock() const=0;
+
+    /** Get canonical count of frames for each 5ms output block */
+    virtual size_t get5MsFrames() const=0;
 };
 
 /** Construct host platform's voice engine */
 std::unique_ptr<IAudioVoiceEngine> NewAudioVoiceEngine();
 
+/** Construct WAV-rendering voice engine */
+std::unique_ptr<IAudioVoiceEngine> NewWAVAudioVoiceEngine(const char* path, double sampleRate);
+#if _WIN32
+std::unique_ptr<IAudioVoiceEngine> NewWAVAudioVoiceEngine(const wchar_t* path, double sampleRate);
+#endif
+
 }
 
 #endif // BOO_IAUDIOVOICEENGINE_HPP

lib/audiodev/AudioSubmix.hpp

@@ -8,6 +8,7 @@
 
 struct AudioUnitVoiceEngine;
 struct VSTVoiceEngine;
+struct WAVOutVoiceEngine;
 
 namespace boo
 {
@@ -20,6 +21,7 @@ class AudioSubmix : public IAudioSubmix, public IAudioMix
     friend struct WASAPIAudioVoiceEngine;
     friend struct ::AudioUnitVoiceEngine;
     friend struct ::VSTVoiceEngine;
+    friend struct ::WAVOutVoiceEngine;
 
     /* Mixer-engine relationships */
     BaseAudioVoiceEngine& m_root;

lib/audiodev/AudioVoice.cpp

@@ -88,7 +88,7 @@ void AudioVoiceMono::_resetSampleRate(double sampleRate)
     soxr_quality_spec_t qSpec = soxr_quality_spec(SOXR_20_BITQ, m_dynamicRate ? SOXR_VR : 0);
 
     soxr_error_t err;
-    m_src = soxr_create(sampleRate, rateOut, 1,
+    m_src = soxr_create(1 << 1, 1, 1,
                         &err, &ioSpec, &qSpec, nullptr);
 
     if (err)

lib/audiodev/AudioVoice.hpp

@@ -8,6 +8,7 @@
 
 struct AudioUnitVoiceEngine;
 struct VSTVoiceEngine;
+struct WAVOutVoiceEngine;
 
 namespace boo
 {
@@ -22,6 +23,7 @@ class AudioVoice : public IAudioVoice
     friend struct WASAPIAudioVoiceEngine;
     friend struct ::AudioUnitVoiceEngine;
     friend struct ::VSTVoiceEngine;
+    friend struct ::WAVOutVoiceEngine;
 
 protected:
     /* Mixer-engine relationships */

lib/audiodev/AudioVoiceEngine.hpp

@@ -65,6 +65,7 @@ public:
     const AudioVoiceEngineMixInfo& mixInfo() const;
     AudioChannelSet getAvailableSet() {return m_mixInfo.m_channels;}
     void pumpAndMixVoices() {}
+    size_t get5MsFrames() const {return m_5msFrames;}
 };
 
 }

lib/audiodev/WAVOut.cpp

@@ -0,0 +1,200 @@
+#include "AudioVoiceEngine.hpp"
+#include "logvisor/logvisor.hpp"
+#include "boo/audiodev/IAudioVoiceEngine.hpp"
+
+static logvisor::Module Log("boo::WAVOut");
+
+struct WAVOutVoiceEngine : boo::BaseAudioVoiceEngine
+{
+    std::vector<float> m_interleavedBuf;
+
+    boo::AudioChannelSet _getAvailableSet()
+    {
+        return boo::AudioChannelSet::Stereo;
+    }
+
+    std::vector<std::pair<std::string, std::string>> enumerateMIDIDevices() const
+    {
+        return {};
+    }
+
+    boo::ReceiveFunctor* m_midiReceiver = nullptr;
+
+    struct MIDIIn : public boo::IMIDIIn
+    {
+        MIDIIn(bool virt, boo::ReceiveFunctor&& receiver)
+        : IMIDIIn(virt, std::move(receiver)) {}
+
+        std::string description() const
+        {
+            return "WAVOut MIDI";
+        }
+    };
+
+    std::unique_ptr<boo::IMIDIIn> newVirtualMIDIIn(boo::ReceiveFunctor&& receiver)
+    {
+        std::unique_ptr<boo::IMIDIIn> ret = std::make_unique<MIDIIn>(true, std::move(receiver));
+        m_midiReceiver = &ret->m_receiver;
+        return ret;
+    }
+
+    std::unique_ptr<boo::IMIDIOut> newVirtualMIDIOut()
+    {
+        return {};
+    }
+
+    std::unique_ptr<boo::IMIDIInOut> newVirtualMIDIInOut(boo::ReceiveFunctor&& receiver)
+    {
+        return {};
+    }
+
+    std::unique_ptr<boo::IMIDIIn> newRealMIDIIn(const char* name, boo::ReceiveFunctor&& receiver)
+    {
+        return {};
+    }
+
+    std::unique_ptr<boo::IMIDIOut> newRealMIDIOut(const char* name)
+    {
+        return {};
+    }
+
+    std::unique_ptr<boo::IMIDIInOut> newRealMIDIInOut(const char* name, boo::ReceiveFunctor&& receiver)
+    {
+        return {};
+    }
+
+    bool useMIDILock() const {return false;}
+
+    FILE* m_fp = nullptr;
+    size_t m_bytesWritten = 0;
+
+    void prepareWAV(double sampleRate)
+    {
+        fwrite("RIFF", 1, 4, m_fp);
+        uint32_t dataSize = 0;
+        uint32_t chunkSize = 36 + dataSize;
+        fwrite(&chunkSize, 1, 4, m_fp);
+        fwrite("WAVE", 1, 4, m_fp);
+
+        fwrite("fmt ", 1, 4, m_fp);
+        uint32_t sixteen = 16;
+        fwrite(&sixteen, 1, 4, m_fp);
+        uint16_t audioFmt = 3;
+        fwrite(&audioFmt, 1, 2, m_fp);
+        uint16_t chCount = 2;
+        fwrite(&chCount, 1, 2, m_fp);
+        uint32_t sampRate = sampleRate;
+        fwrite(&sampRate, 1, 4, m_fp);
+        uint16_t blockAlign = 8;
+        uint32_t byteRate = sampRate * blockAlign;
+        fwrite(&byteRate, 1, 4, m_fp);
+        fwrite(&blockAlign, 1, 2, m_fp);
+        uint16_t bps = 32;
+        fwrite(&bps, 1, 2, m_fp);
+
+        fwrite("data", 1, 4, m_fp);
+        fwrite(&dataSize, 1, 4, m_fp);
+
+        m_mixInfo.m_periodFrames = 512;
+        m_mixInfo.m_sampleRate = sampleRate;
+        m_mixInfo.m_sampleFormat = SOXR_FLOAT32_I;
+        m_mixInfo.m_bitsPerSample = 32;
+        _buildAudioRenderClient();
+    }
+
+    WAVOutVoiceEngine(const char* path, double sampleRate)
+    {
+        m_fp = fopen(path, "wb");
+        if (!m_fp)
+            return;
+        prepareWAV(sampleRate);
+    }
+
+#if _WIN32
+    WAVOutVoiceEngine(const wchar_t* path, double sampleRate)
+    {
+        m_fp = _wfopen(path, "wb");
+        if (!m_fp)
+            return;
+        prepareWAV(sampleRate);
+    }
+#endif
+
+    void finishWav()
+    {
+        uint32_t dataSize = m_bytesWritten;
+
+        fseek(m_fp, 4, SEEK_SET);
+        uint32_t chunkSize = 36 + dataSize;
+        fwrite(&chunkSize, 1, 4, m_fp);
+
+        fseek(m_fp, 40, SEEK_SET);
+        fwrite(&dataSize, 1, 4, m_fp);
+
+        fclose(m_fp);
+    }
+
+    ~WAVOutVoiceEngine()
+    {
+        finishWav();
+    }
+
+    void _buildAudioRenderClient()
+    {
+        m_mixInfo.m_channels = _getAvailableSet();
+        unsigned chCount = ChannelCount(m_mixInfo.m_channels);
+
+        m_5msFrames = m_mixInfo.m_sampleRate * 5 / 1000;
+        m_interleavedBuf.resize(2 * m_5msFrames);
+
+        boo::ChannelMap& chMapOut = m_mixInfo.m_channelMap;
+        chMapOut.m_channelCount = 2;
+        chMapOut.m_channels[0] = boo::AudioChannel::FrontLeft;
+        chMapOut.m_channels[1] = boo::AudioChannel::FrontRight;
+
+        while (chMapOut.m_channelCount < chCount)
+            chMapOut.m_channels[chMapOut.m_channelCount++] = boo::AudioChannel::Unknown;
+    }
+
+    void _rebuildAudioRenderClient(double sampleRate, size_t periodFrames)
+    {
+        m_mixInfo.m_periodFrames = periodFrames;
+        m_mixInfo.m_sampleRate = sampleRate;
+        _buildAudioRenderClient();
+
+        for (boo::AudioVoice* vox : m_activeVoices)
+            vox->_resetSampleRate(vox->m_sampleRateIn);
+        for (boo::AudioSubmix* smx : m_activeSubmixes)
+            smx->_resetOutputSampleRate();
+    }
+
+    void pumpAndMixVoices()
+    {
+        _pumpAndMixVoices(m_5msFrames, m_interleavedBuf.data());
+        fwrite(m_interleavedBuf.data(), 1, m_5msFrames * 8, m_fp);
+        m_bytesWritten += m_5msFrames * 8;
+    }
+};
+
+namespace boo
+{
+
+std::unique_ptr<IAudioVoiceEngine> NewWAVAudioVoiceEngine(const char* path, double sampleRate)
+{
+    std::unique_ptr<IAudioVoiceEngine> ret = std::make_unique<WAVOutVoiceEngine>(path, sampleRate);
+    if (!static_cast<WAVOutVoiceEngine&>(*ret).m_fp)
+        return {};
+    return ret;
+}
+
+#if _WIN32
+std::unique_ptr<IAudioVoiceEngine> NewWAVAudioVoiceEngine(const wchar_t* path, double sampleRate)
+{
+    std::unique_ptr<IAudioVoiceEngine> ret = std::make_unique<WAVOutVoiceEngine>(path, sampleRate);
+    if (!static_cast<WAVOutVoiceEngine&>(*ret).m_fp)
+        return {};
+    return ret;
+}
+#endif
+
+}