asio_protocol.hpp

#pragma once
#include <ossia/detail/config.hpp>
 
#if defined(OSSIA_ENABLE_ASIO)
#include <ossia/audio/audio_engine.hpp>
#include <ossia/detail/fmt.hpp>
#include <ossia/detail/logger.hpp>
#include <ossia/detail/pod_vector.hpp>
#include <ossia/detail/thread.hpp>
 
#if !defined(WIN32_LEAN_AND_MEAN)
#define WIN32_LEAN_AND_MEAN
#endif
#if !defined(NOMINMAX)
#define NOMINMAX
#endif
 
// iasiodrv.h uses IUnknown without including unknwn.h, and WIN32_LEAN_AND_MEAN
// stops windows.h from pulling it in.
#include <windows.h>
#include <unknwn.h>
 
#include <asiodrivers.h>
#include <asio.h>
#include <iasiodrv.h>
 
bool loadAsioDriver(char *name);
extern AsioDrivers* asioDrivers;
 
#include <algorithm>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
 
#define OSSIA_AUDIO_ASIO 1
 
namespace ossia
{
struct asio_card
{
  std::string name;
  int driver_index{-1};
};
 
// Must be a singleton — ASIO SDK only supports one loaded driver at a time.
// We store the active engine pointer in a global so the static ASIO callbacks
// can reach it.
class asio_engine;
namespace detail
{
inline asio_engine* current_asio_engine = nullptr;
}
 
class asio_engine final : public audio_engine
{
public:
  asio_engine(
      std::string driver_name, int inputs, int outputs, int rate, int bs)
  {
    if(detail::current_asio_engine)
    {
      throw std::runtime_error(
          "ASIO error: driver '" + detail::current_asio_engine->m_driver_name
          + "' is still active, cannot open '" + driver_name + "'");
    }
 
    detail::current_asio_engine = this;
    m_driver_name = driver_name;
 
    // Load the ASIO driver
    if(!loadAsioDriver(const_cast<char*>(driver_name.c_str())))
    {
      cleanup();
      throw std::runtime_error("ASIO error: could not load driver '" + driver_name + "'");
    }
 
    // Initialize the driver
    ASIODriverInfo driverInfo{};
    driverInfo.asioVersion = 2;
    driverInfo.sysRef = nullptr; // no window handle needed for headless operation
 
    if(ASIOInit(&driverInfo) != ASE_OK)
    {
      cleanup();
      throw std::runtime_error(
          std::string("ASIO error: ASIOInit failed: ") + driverInfo.errorMessage);
    }
    m_initialized = true;
 
    // Query driver capabilities
    long maxInputChannels = 0, maxOutputChannels = 0;
    if(ASIOGetChannels(&maxInputChannels, &maxOutputChannels) != ASE_OK)
    {
      cleanup();
      throw std::runtime_error("ASIO error: ASIOGetChannels failed");
    }
 
    inputs = std::min((long)inputs, maxInputChannels);
    outputs = std::min((long)outputs, maxOutputChannels);
 
    if(inputs == 0 && outputs == 0)
    {
      cleanup();
      throw std::runtime_error("ASIO error: no channels available");
    }
 
    // Set sample rate
    if(ASIOCanSampleRate((ASIOSampleRate)rate) != ASE_OK)
    {
      // Try to use the driver's current rate
      ASIOSampleRate currentRate = 0;
      if(ASIOGetSampleRate(&currentRate) == ASE_OK && currentRate > 0)
      {
        rate = (int)currentRate;
      }
      else
      {
        cleanup();
        throw std::runtime_error("ASIO error: sample rate not supported");
      }
    }
    else
    {
      if(ASIOSetSampleRate((ASIOSampleRate)rate) != ASE_OK)
      {
        cleanup();
        throw std::runtime_error("ASIO error: could not set sample rate");
      }
    }
 
    // Query buffer size
    long minSize = 0, maxSize = 0, preferredSize = 0, granularity = 0;
    if(ASIOGetBufferSize(&minSize, &maxSize, &preferredSize, &granularity) != ASE_OK)
    {
      cleanup();
      throw std::runtime_error("ASIO error: ASIOGetBufferSize failed");
    }
 
    // Clamp requested buffer size to driver constraints
    if(bs <= 0)
      bs = preferredSize;
    bs = std::max(bs, (int)minSize);
    bs = std::min(bs, (int)maxSize);
 
    // For power-of-2 granularity, snap to nearest valid power of 2
    if(granularity == -1)
    {
      int pot = minSize;
      while(pot < bs && pot < maxSize)
        pot *= 2;
      bs = pot;
    }
    else if(granularity > 0)
    {
      bs = ((bs + granularity - 1) / granularity) * granularity;
      bs = std::min(bs, (int)maxSize);
    }
 
    m_bufferSize = bs;
    m_inputCount = inputs;
    m_outputCount = outputs;
 
    // Allocate buffer info structures
    int totalChannels = inputs + outputs;
    m_bufferInfos.resize(totalChannels);
    m_channelInfos.resize(totalChannels);
 
    int idx = 0;
    for(int i = 0; i < inputs; i++, idx++)
    {
      m_bufferInfos[idx].isInput = ASIOTrue;
      m_bufferInfos[idx].channelNum = i;
      m_bufferInfos[idx].buffers[0] = m_bufferInfos[idx].buffers[1] = nullptr;
    }
    for(int i = 0; i < outputs; i++, idx++)
    {
      m_bufferInfos[idx].isInput = ASIOFalse;
      m_bufferInfos[idx].channelNum = i;
      m_bufferInfos[idx].buffers[0] = m_bufferInfos[idx].buffers[1] = nullptr;
    }
 
    // Set up callbacks
    m_asioCallbacks.bufferSwitch = &asio_bufferSwitch;
    m_asioCallbacks.sampleRateDidChange = &asio_sampleRateDidChange;
    m_asioCallbacks.asioMessage = &asio_message;
    m_asioCallbacks.bufferSwitchTimeInfo = &asio_bufferSwitchTimeInfo;
 
    // Create buffers
    if(ASIOCreateBuffers(
           m_bufferInfos.data(), totalChannels, m_bufferSize, &m_asioCallbacks)
       != ASE_OK)
    {
      cleanup();
      throw std::runtime_error("ASIO error: ASIOCreateBuffers failed");
    }
    m_buffersCreated = true;
 
    // Get channel info (for sample format)
    for(int i = 0; i < totalChannels; i++)
    {
      m_channelInfos[i].channel = m_bufferInfos[i].channelNum;
      m_channelInfos[i].isInput = m_bufferInfos[i].isInput;
      if(ASIOGetChannelInfo(&m_channelInfos[i]) != ASE_OK)
      {
        cleanup();
        throw std::runtime_error("ASIO error: ASIOGetChannelInfo failed");
      }
    }
 
    // Check if ASIOOutputReady is supported
    m_postOutput = (ASIOOutputReady() == ASE_OK);
 
    // Allocate float conversion buffers (non-interleaved, one per channel)
    m_floatInputs.resize(inputs);
    m_floatOutputs.resize(outputs);
    m_inputPtrs.resize(inputs);
    m_outputPtrs.resize(outputs);
    for(int i = 0; i < inputs; i++)
    {
      m_floatInputs[i].resize(m_bufferSize);
      m_inputPtrs[i] = m_floatInputs[i].data();
    }
    for(int i = 0; i < outputs; i++)
    {
      m_floatOutputs[i].resize(m_bufferSize);
      m_outputPtrs[i] = m_floatOutputs[i].data();
    }
 
    // Set effective parameters
    this->effective_sample_rate = rate;
    this->effective_buffer_size = m_bufferSize;
    this->effective_inputs = inputs;
    this->effective_outputs = outputs;
 
    // Start processing
    if(ASIOStart() != ASE_OK)
    {
      cleanup();
      throw std::runtime_error("ASIO error: ASIOStart failed");
    }
    m_started = true;
  }
 
  bool running() const override { return m_started && !stop_processing; }
 
  void stop() override
  {
    audio_engine::stop();
 
    // Released here, not in the destructor: hosts defer destruction and ASIO
    // allows a single loaded driver per process.
    cleanup();
 
    // No further callbacks after ASIOStop(), so acknowledge the stop ourselves.
    stop_received = true;
  }
 
  ~asio_engine() override { stop(); }
 
  static std::vector<asio_card> enumerate_drivers()
  {
    std::vector<asio_card> cards;
 
    AsioDrivers drivers;
    const long numDrivers = drivers.asioGetNumDev();
    ossia::logger().info(fmt::format("ASIO: {} driver(s) installed", numDrivers));
 
    for(long i = 0; i < numDrivers; i++)
    {
      char name[MAXDRVNAMELEN]{};
      const long rc = drivers.asioGetDriverName(i, name, sizeof(name));
      if(rc == 0)
      {
        ossia::logger().info(fmt::format("ASIO: [{}] '{}'", i, name));
        cards.push_back({name, (int)i});
      }
      else
      {
        // Should not happen: the index came from asioGetNumDev().
        ossia::logger().warn(
            fmt::format("ASIO: asioGetDriverName({}) failed, rc={}, driver skipped", i, rc));
      }
    }
 
    return cards;
  }
 
  // Name of the driver currently loaded by an active engine, empty if none.
  static std::string active_driver()
  {
    if(auto* e = detail::current_asio_engine)
      return e->m_driver_name;
    return {};
  }
 
  enum class control_panel_result
  {
    ok,
    other_driver_active,
    load_failed,
    init_failed
  };
 
  // Targets driver_name specifically: ASIOControlPanel() talks to whichever
  // driver happens to be loaded, and loading another would release that one.
  static control_panel_result open_control_panel(const std::string& driver_name)
  {
    if(auto* engine = detail::current_asio_engine)
    {
      if(engine->m_driver_name != driver_name)
      {
        ossia::logger().warn(fmt::format(
            "ASIO: cannot open the control panel of '{}': '{}' is currently streaming",
            driver_name, engine->m_driver_name));
        return control_panel_result::other_driver_active;
      }
 
      ASIOControlPanel();
      return control_panel_result::ok;
    }
 
    // Nothing running: load the requested driver just long enough to show it.
    if(!loadAsioDriver(const_cast<char*>(driver_name.c_str())))
    {
      ossia::logger().warn(
          fmt::format("ASIO: could not load '{}' to show its control panel", driver_name));
      return control_panel_result::load_failed;
    }
 
    ASIODriverInfo info{};
    info.asioVersion = 2;
    if(ASIOInit(&info) != ASE_OK)
    {
      if(asioDrivers)
        asioDrivers->removeCurrentDriver();
      ossia::logger().warn(fmt::format(
          "ASIO: ASIOInit failed for '{}', cannot show its control panel ({})",
          driver_name, info.errorMessage[0] ? info.errorMessage : "no message"));
      return control_panel_result::init_failed;
    }
 
    ASIOControlPanel();
 
    // Unload, so a later request for a different driver still works.
    ASIOExit();
    if(asioDrivers)
      asioDrivers->removeCurrentDriver();
 
    return control_panel_result::ok;
  }
 
private:
  // Idempotent, and a no-op unless this engine still owns the driver.
  void cleanup()
  {
    if(detail::current_asio_engine != this)
      return;
 
    if(m_started)
    {
      ASIOStop();
      m_started = false;
    }
 
    if(m_buffersCreated)
    {
      ASIODisposeBuffers();
      m_buffersCreated = false;
    }
 
    if(m_initialized)
    {
      ASIOExit();
      m_initialized = false;
    }
 
    if(asioDrivers)
      asioDrivers->removeCurrentDriver();
 
    // Cleared last: the callbacks reach the engine through this pointer.
    detail::current_asio_engine = nullptr;
  }
 
  // Convert ASIO native buffer to float for one channel
  static void convertToFloat(
      void* src, float* dst, long frames, ASIOSampleType type)
  {
    switch(type)
    {
      case ASIOSTFloat32LSB:
      {
        std::memcpy(dst, src, frames * sizeof(float));
        break;
      }
      case ASIOSTFloat64LSB:
      {
        auto* s = static_cast<double*>(src);
        for(long i = 0; i < frames; i++)
          dst[i] = (float)s[i];
        break;
      }
      case ASIOSTInt32LSB:
      {
        auto* s = static_cast<int32_t*>(src);
        constexpr float scale = 1.0f / 2147483648.0f;
        for(long i = 0; i < frames; i++)
          dst[i] = s[i] * scale;
        break;
      }
      case ASIOSTInt24LSB:
      {
        auto* s = static_cast<uint8_t*>(src);
        constexpr float scale = 1.0f / 8388608.0f;
        for(long i = 0; i < frames; i++)
        {
          int32_t val = (int32_t(s[i * 3 + 2]) << 24) | (int32_t(s[i * 3 + 1]) << 16)
                        | (int32_t(s[i * 3]) << 8);
          dst[i] = (val >> 8) * scale;
        }
        break;
      }
      case ASIOSTInt16LSB:
      {
        auto* s = static_cast<int16_t*>(src);
        constexpr float scale = 1.0f / 32768.0f;
        for(long i = 0; i < frames; i++)
          dst[i] = s[i] * scale;
        break;
      }
      case ASIOSTInt32LSB16:
      {
        auto* s = static_cast<int32_t*>(src);
        constexpr float scale = 1.0f / 32768.0f;
        for(long i = 0; i < frames; i++)
          dst[i] = (s[i] & 0xFFFF) * scale;
        break;
      }
      case ASIOSTInt32LSB18:
      {
        auto* s = static_cast<int32_t*>(src);
        constexpr float scale = 1.0f / 131072.0f;
        for(long i = 0; i < frames; i++)
          dst[i] = (s[i] & 0x3FFFF) * scale;
        break;
      }
      case ASIOSTInt32LSB20:
      {
        auto* s = static_cast<int32_t*>(src);
        constexpr float scale = 1.0f / 524288.0f;
        for(long i = 0; i < frames; i++)
          dst[i] = (s[i] & 0xFFFFF) * scale;
        break;
      }
      case ASIOSTInt32LSB24:
      {
        auto* s = static_cast<int32_t*>(src);
        constexpr float scale = 1.0f / 8388608.0f;
        for(long i = 0; i < frames; i++)
          dst[i] = (s[i] & 0xFFFFFF) * scale;
        break;
      }
      // MSB formats (big-endian) — rare on x86 but must be handled
      case ASIOSTFloat32MSB:
      {
        auto* s = static_cast<uint8_t*>(src);
        for(long i = 0; i < frames; i++)
        {
          uint32_t val = (uint32_t(s[i * 4]) << 24) | (uint32_t(s[i * 4 + 1]) << 16)
                         | (uint32_t(s[i * 4 + 2]) << 8) | uint32_t(s[i * 4 + 3]);
          float f;
          std::memcpy(&f, &val, 4);
          dst[i] = f;
        }
        break;
      }
      case ASIOSTInt32MSB:
      {
        auto* s = static_cast<uint8_t*>(src);
        constexpr float scale = 1.0f / 2147483648.0f;
        for(long i = 0; i < frames; i++)
        {
          int32_t val = (int32_t(s[i * 4]) << 24) | (int32_t(s[i * 4 + 1]) << 16)
                        | (int32_t(s[i * 4 + 2]) << 8) | int32_t(s[i * 4 + 3]);
          dst[i] = val * scale;
        }
        break;
      }
      case ASIOSTInt16MSB:
      {
        auto* s = static_cast<uint8_t*>(src);
        constexpr float scale = 1.0f / 32768.0f;
        for(long i = 0; i < frames; i++)
        {
          int16_t val = (int16_t(s[i * 2]) << 8) | int16_t(s[i * 2 + 1]);
          dst[i] = val * scale;
        }
        break;
      }
      default:
        std::memset(dst, 0, frames * sizeof(float));
        break;
    }
  }
 
  // Convert float to ASIO native buffer for one channel
  static void convertFromFloat(
      const float* src, void* dst, long frames, ASIOSampleType type)
  {
    switch(type)
    {
      case ASIOSTFloat32LSB:
      {
        std::memcpy(dst, src, frames * sizeof(float));
        break;
      }
      case ASIOSTFloat64LSB:
      {
        auto* d = static_cast<double*>(dst);
        for(long i = 0; i < frames; i++)
          d[i] = (double)src[i];
        break;
      }
      case ASIOSTInt32LSB:
      {
        auto* d = static_cast<int32_t*>(dst);
        constexpr double scale = 2147483647.0;
        for(long i = 0; i < frames; i++)
        {
          double val = std::max(-1.0, std::min(1.0, (double)src[i]));
          d[i] = (int32_t)(val * scale);
        }
        break;
      }
      case ASIOSTInt24LSB:
      {
        auto* d = static_cast<uint8_t*>(dst);
        constexpr double scale = 8388607.0;
        for(long i = 0; i < frames; i++)
        {
          double val = std::max(-1.0, std::min(1.0, (double)src[i]));
          int32_t s = (int32_t)(val * scale);
          d[i * 3] = (uint8_t)(s & 0xFF);
          d[i * 3 + 1] = (uint8_t)((s >> 8) & 0xFF);
          d[i * 3 + 2] = (uint8_t)((s >> 16) & 0xFF);
        }
        break;
      }
      case ASIOSTInt16LSB:
      {
        auto* d = static_cast<int16_t*>(dst);
        constexpr double scale = 32767.0;
        for(long i = 0; i < frames; i++)
        {
          double val = std::max(-1.0, std::min(1.0, (double)src[i]));
          d[i] = (int16_t)(val * scale);
        }
        break;
      }
      case ASIOSTInt32LSB16:
      {
        auto* d = static_cast<int32_t*>(dst);
        constexpr double scale = 32767.0;
        for(long i = 0; i < frames; i++)
        {
          double val = std::max(-1.0, std::min(1.0, (double)src[i]));
          d[i] = (int32_t)(val * scale);
        }
        break;
      }
      case ASIOSTInt32LSB18:
      {
        auto* d = static_cast<int32_t*>(dst);
        constexpr double scale = 131071.0;
        for(long i = 0; i < frames; i++)
        {
          double val = std::max(-1.0, std::min(1.0, (double)src[i]));
          d[i] = (int32_t)(val * scale);
        }
        break;
      }
      case ASIOSTInt32LSB20:
      {
        auto* d = static_cast<int32_t*>(dst);
        constexpr double scale = 524287.0;
        for(long i = 0; i < frames; i++)
        {
          double val = std::max(-1.0, std::min(1.0, (double)src[i]));
          d[i] = (int32_t)(val * scale);
        }
        break;
      }
      case ASIOSTInt32LSB24:
      {
        auto* d = static_cast<int32_t*>(dst);
        constexpr double scale = 8388607.0;
        for(long i = 0; i < frames; i++)
        {
          double val = std::max(-1.0, std::min(1.0, (double)src[i]));
          d[i] = (int32_t)(val * scale);
        }
        break;
      }
      case ASIOSTFloat32MSB:
      {
        auto* d = static_cast<uint8_t*>(dst);
        for(long i = 0; i < frames; i++)
        {
          uint32_t val;
          std::memcpy(&val, &src[i], 4);
          d[i * 4] = (uint8_t)(val >> 24);
          d[i * 4 + 1] = (uint8_t)(val >> 16);
          d[i * 4 + 2] = (uint8_t)(val >> 8);
          d[i * 4 + 3] = (uint8_t)(val);
        }
        break;
      }
      case ASIOSTInt32MSB:
      {
        auto* d = static_cast<uint8_t*>(dst);
        constexpr double scale = 2147483647.0;
        for(long i = 0; i < frames; i++)
        {
          double val = std::max(-1.0, std::min(1.0, (double)src[i]));
          int32_t s = (int32_t)(val * scale);
          d[i * 4] = (uint8_t)(s >> 24);
          d[i * 4 + 1] = (uint8_t)(s >> 16);
          d[i * 4 + 2] = (uint8_t)(s >> 8);
          d[i * 4 + 3] = (uint8_t)(s);
        }
        break;
      }
      case ASIOSTInt16MSB:
      {
        auto* d = static_cast<uint8_t*>(dst);
        constexpr double scale = 32767.0;
        for(long i = 0; i < frames; i++)
        {
          double val = std::max(-1.0, std::min(1.0, (double)src[i]));
          int16_t s = (int16_t)(val * scale);
          d[i * 2] = (uint8_t)(s >> 8);
          d[i * 2 + 1] = (uint8_t)(s);
        }
        break;
      }
      default:
        break;
    }
  }
 
  // === ASIO Callbacks (static, use global engine pointer) ===
 
  static ASIOTime* asio_bufferSwitchTimeInfo(
      ASIOTime* params, long doubleBufferIndex, ASIOBool directProcess)
  {
    auto* self = detail::current_asio_engine;
    if(!self)
      return nullptr;
 
    [[maybe_unused]] static const thread_local auto _ = [] {
      ossia::set_thread_name("ossia audio 0");
      ossia::set_thread_pinned(thread_type::Audio, 0);
      return 0;
    }();
 
    self->tick_start();
 
    if(self->stop_processing)
    {
      self->tick_clear();
      // Clear output buffers
      for(int i = 0; i < self->m_outputCount; i++)
      {
        auto& info = self->m_bufferInfos[self->m_inputCount + i];
        auto& chanInfo = self->m_channelInfos[self->m_inputCount + i];
        void* buf = info.buffers[doubleBufferIndex];
        if(buf)
        {
          std::memset(buf, 0, self->sampleSize(chanInfo.type) * self->m_bufferSize);
        }
      }
      if(self->m_postOutput)
        ASIOOutputReady();
      return nullptr;
    }
 
    const long frames = self->m_bufferSize;
 
    // Convert ASIO input buffers -> float
    for(int i = 0; i < self->m_inputCount; i++)
    {
      void* src = self->m_bufferInfos[i].buffers[doubleBufferIndex];
      convertToFloat(src, self->m_inputPtrs[i], frames, self->m_channelInfos[i].type);
    }
 
    // Clear float output buffers
    for(int i = 0; i < self->m_outputCount; i++)
    {
      std::memset(self->m_outputPtrs[i], 0, frames * sizeof(float));
    }
 
    // Compute time — ASIO has no transport, so we only provide wall-clock
    // seconds (like PortAudio). samplePosition is a monotonic counter since
    // ASIOStart() and must NOT be used as position_in_frames (which is a
    // transport position that resets on stop/play).
    double seconds = 0.0;
    if(params && (params->timeInfo.flags & kSystemTimeValid))
    {
      seconds = asioSamplesToDouble(params->timeInfo.systemTime) * 1e-9;
    }
 
    // Call audio tick
    ossia::audio_tick_state ts{
        const_cast<float* const*>(self->m_inputPtrs.data()),
        self->m_outputPtrs.data(),
        self->m_inputCount,
        self->m_outputCount,
        (uint64_t)frames,
        seconds};
 
    self->audio_tick(ts);
    self->tick_end();
 
    // Convert float output buffers -> ASIO native format
    for(int i = 0; i < self->m_outputCount; i++)
    {
      int chIdx = self->m_inputCount + i;
      void* dst = self->m_bufferInfos[chIdx].buffers[doubleBufferIndex];
      convertFromFloat(
          self->m_outputPtrs[i], dst, frames, self->m_channelInfos[chIdx].type);
    }
 
    if(self->m_postOutput)
      ASIOOutputReady();
 
    return nullptr;
  }
 
  static void asio_bufferSwitch(long doubleBufferIndex, ASIOBool directProcess)
  {
    // Construct time info and delegate to the time-info callback
    ASIOTime timeInfo{};
    std::memset(&timeInfo, 0, sizeof(ASIOTime));
 
    ASIOSamples sPos;
    ASIOTimeStamp tStamp;
    if(ASIOGetSamplePosition(&sPos, &tStamp) == ASE_OK)
    {
      timeInfo.timeInfo.samplePosition = sPos;
      timeInfo.timeInfo.systemTime = tStamp;
      timeInfo.timeInfo.flags = kSystemTimeValid | kSamplePositionValid;
    }
 
    ASIOSampleRate sRate = 0;
    if(ASIOGetSampleRate(&sRate) == ASE_OK)
    {
      timeInfo.timeInfo.sampleRate = sRate;
      timeInfo.timeInfo.flags |= kSampleRateValid;
    }
 
    asio_bufferSwitchTimeInfo(&timeInfo, doubleBufferIndex, directProcess);
  }
 
  static void asio_sampleRateDidChange(ASIOSampleRate sRate)
  {
    auto* self = detail::current_asio_engine;
    if(self && sRate > 0)
    {
      self->effective_sample_rate = (int)sRate;
    }
  }
 
  static long asio_message(long selector, long value, void* message, double* opt)
  {
    switch(selector)
    {
      case kAsioSelectorSupported:
        switch(value)
        {
          case kAsioEngineVersion:
          case kAsioSupportsTimeInfo:
          case kAsioResetRequest:
          case kAsioResyncRequest:
          case kAsioLatenciesChanged:
          case kAsioOverload:
            return 1;
          default:
            return 0;
        }
 
      case kAsioEngineVersion:
        return 2;
 
      case kAsioSupportsTimeInfo:
        return 1;
 
      case kAsioResetRequest:
        // Driver requests reset — for now, just acknowledge
        return 1;
 
      case kAsioResyncRequest:
        return 1;
 
      case kAsioLatenciesChanged:
        return 1;
 
      case kAsioOverload:
        return 1;
 
      default:
        return 0;
    }
  }
 
  static double asioSamplesToDouble(const ASIOSamples& s)
  {
#if NATIVE_INT64
    return (double)s;
#else
    return s.hi * 4294967296.0 + s.lo;
#endif
  }
 
  static double asioSamplesToDouble(const ASIOTimeStamp& s)
  {
#if NATIVE_INT64
    return (double)s;
#else
    return s.hi * 4294967296.0 + s.lo;
#endif
  }
 
  static long sampleSize(ASIOSampleType type)
  {
    switch(type)
    {
      case ASIOSTInt16MSB:
      case ASIOSTInt16LSB:
        return 2;
      case ASIOSTInt24MSB:
      case ASIOSTInt24LSB:
        return 3;
      case ASIOSTInt32MSB:
      case ASIOSTInt32LSB:
      case ASIOSTFloat32MSB:
      case ASIOSTFloat32LSB:
      case ASIOSTInt32MSB16:
      case ASIOSTInt32MSB18:
      case ASIOSTInt32MSB20:
      case ASIOSTInt32MSB24:
      case ASIOSTInt32LSB16:
      case ASIOSTInt32LSB18:
      case ASIOSTInt32LSB20:
      case ASIOSTInt32LSB24:
        return 4;
      case ASIOSTFloat64MSB:
      case ASIOSTFloat64LSB:
        return 8;
      default:
        return 4;
    }
  }
 
  std::vector<ASIOBufferInfo> m_bufferInfos;
  std::vector<ASIOChannelInfo> m_channelInfos;
  ASIOCallbacks m_asioCallbacks{};
 
  // Float conversion buffers
  std::vector<ossia::float_vector> m_floatInputs;
  std::vector<ossia::float_vector> m_floatOutputs;
  ossia::pod_vector<float*> m_inputPtrs;
  ossia::pod_vector<float*> m_outputPtrs;
 
  std::string m_driver_name;
 
  int m_bufferSize{};
  int m_inputCount{};
  int m_outputCount{};
  bool m_postOutput{};
  bool m_initialized{};
  bool m_buffersCreated{};
  bool m_started{};
};
}
 
#endif