furnace/extern/portaudio-modified/bindings/cpp/include/portaudiocpp/CppFunCallbackStream.hxx

#ifndef INCLUDED_PORTAUDIO_CPPFUNCALLBACKSTREAM_HXX
#define INCLUDED_PORTAUDIO_CPPFUNCALLBACKSTREAM_HXX

// ---------------------------------------------------------------------------------------

#include "portaudio.h"

#include "portaudiocpp/CallbackStream.hxx"

// ---------------------------------------------------------------------------------------

// Forward declaration(s):
namespace portaudio
{
    class StreamParameters;
}

// ---------------------------------------------------------------------------------------

// Declaration(s):
namespace portaudio
{


    namespace impl
    {
        extern "C"
        {
            int cppCallbackToPaCallbackAdapter(const void *inputBuffer, void *outputBuffer, unsigned long numFrames,
                const PaStreamCallbackTimeInfo *timeInfo, PaStreamCallbackFlags statusFlags,
                void *userData);
        } // extern "C"
    }

    // -----------------------------------------------------------------------------------

    //////
    /// @brief Callback stream using a C++ function (either a free function or a static function)
    /// callback.
    //////
    class FunCallbackStream : public CallbackStream
    {
    public:
        typedef int (*CallbackFunPtr)(const void *inputBuffer, void *outputBuffer, unsigned long numFrames,
            const PaStreamCallbackTimeInfo *timeInfo, PaStreamCallbackFlags statusFlags,
            void *userData);

        // -------------------------------------------------------------------------------

        //////
        /// @brief Simple structure containing a function pointer to the C++ callback function and a
        /// (void) pointer to the user supplied data.
        //////
        struct CppToCCallbackData
        {
            CppToCCallbackData();
            CppToCCallbackData(CallbackFunPtr funPtr, void *userData);
            void init(CallbackFunPtr funPtr, void *userData);

            CallbackFunPtr funPtr;
            void *userData;
        };

        // -------------------------------------------------------------------------------

        FunCallbackStream();
        FunCallbackStream(const StreamParameters &parameters, CallbackFunPtr funPtr, void *userData);
        ~FunCallbackStream();

        void open(const StreamParameters &parameters, CallbackFunPtr funPtr, void *userData);

    private:
        FunCallbackStream(const FunCallbackStream &); // non-copyable
        FunCallbackStream &operator=(const FunCallbackStream &); // non-copyable

        CppToCCallbackData adapterData_;

        void open(const StreamParameters &parameters);
    };


} // portaudio

// ---------------------------------------------------------------------------------------

#endif // INCLUDED_PORTAUDIO_CPPFUNCALLBACKSTREAM_HXX