MuditaOS/module-bsp/board/linux/audio/LinuxCellularAudio.cpp

/*
 *  @file LinuxCellularAudio.cpp
 *  @author Mateusz Piesta (mateusz.piesta@mudita.com)
 *  @date 02.08.19
 *  @brief  
 *  @copyright Copyright (C) 2019 mudita.com
 *  @details
 */



#include "LinuxCellularAudio.hpp"


#include "linux_audiocodec.hpp"

#include "log/log.hpp"


namespace bsp {

    LinuxCellularAudio::LinuxCellularAudio(audioCallback_t callback) : AudioDevice(callback), stream(nullptr) {
        PaError err = Pa_Initialize();
        if (err != paNoError) {
            LOG_ERROR("PortAudio error: %s\n", Pa_GetErrorText(err));
            return;
        }

        isInitialized = true;
    }

    LinuxCellularAudio::~LinuxCellularAudio() {

        PaError err = paNoError;

        if (stream) {
            err = Pa_CloseStream(stream);
            if (err != paNoError) {
                LOG_ERROR("PortAudio error: %s\n", Pa_GetErrorText(err));
            }
        }


        err = Pa_Terminate();
        if (err != paNoError) {
            LOG_ERROR("PortAudio error: %s\n", Pa_GetErrorText(err));
        }
    }

    int32_t LinuxCellularAudio::Start(const bsp::AudioDevice::Format &format) {

        if(!TryOpenStream(format)){
            return paInternalError;
        }

        auto err = Pa_StartStream(stream);
        if (err != paNoError) {
            LOG_ERROR("PortAudio error: %s\n", Pa_GetErrorText(err));
            return err;
        }

        currentFormat = format;

        return 0;

    }

    int32_t LinuxCellularAudio::Stop() {

        if (stream) {
            PaError err = Pa_CloseStream(stream);
            if (err != paNoError) {
                LOG_ERROR("PortAudio error: %s\n", Pa_GetErrorText(err));
            }
        }

        stream = nullptr;
        currentFormat = {};

        return 0;
    }

    int LinuxCellularAudio::portAudioCallback(const void *inputBuffer, void *outputBuffer, unsigned long framesPerBuffer,
                                           const PaStreamCallbackTimeInfo *timeInfo, PaStreamCallbackFlags statusFlags,
                                           void *userData) {

        LinuxCellularAudio *ptr = reinterpret_cast<LinuxCellularAudio *>(userData);

        uint32_t framesToFetch = framesPerBuffer;

        if ((ptr->currentFormat.flags & static_cast<uint32_t >(Flags::OutPutStereo)) ) {
            framesToFetch = framesPerBuffer * 2;
        }

        if (ptr->currentFormat.flags & static_cast<uint32_t >(Flags::InputStereo)) {
            framesToFetch = framesPerBuffer * 2;
        }

        if (inputBuffer) {
            int16_t *pBuff = reinterpret_cast<int16_t *>(const_cast<void *>(inputBuffer));
            std::transform(pBuff, pBuff + framesToFetch, pBuff,
                           [ptr](int16_t c) -> int16_t {
                               return (float)c * ptr->currentFormat.inputGain;
                           });
        }


        auto ret = ptr->callback(inputBuffer, outputBuffer, framesToFetch);
        if (ret == 0) {
            // close stream
            return paAbort;
        } else if (ret <= framesToFetch) {

            // Scale output buffer
            if (outputBuffer) {
                int16_t *pBuff = reinterpret_cast<int16_t *>(outputBuffer);
                std::transform(pBuff, pBuff + framesToFetch, pBuff,
                               [ptr](int16_t c) -> int16_t {
                                   return (float)c * ptr->currentFormat.outputVolume;
                               });
            }
            return paContinue;
        }

        return paAbort;
    }

    int32_t LinuxCellularAudio::InputGainCtrl(float gain) {
        currentFormat.inputGain = gain;
        return 0;
    }

    int32_t LinuxCellularAudio::OutputVolumeCtrl(float vol) {
        currentFormat.outputVolume = vol;
        return 0;
    }

    int32_t LinuxCellularAudio::InputPathCtrl([[maybe_unused]] InputPath inputPath) {
        return 0;
    }

    int32_t LinuxCellularAudio::OutputPathCtrl([[maybe_unused]] OutputPath outputPath) {
        return 0;
    }

    bool LinuxCellularAudio::TryOpenStream(const bsp::AudioDevice::Format &format) {
        uint32_t outChan = 0;
        uint32_t inChan = 0;


        if (format.flags & static_cast<uint32_t >(AudioDevice::Flags::InputLeft)) {
            inChan++;
        }

        if (format.flags & static_cast<uint32_t >(AudioDevice::Flags::InputRight)) {
            inChan++;
        }

        if (format.flags & static_cast<uint32_t >(AudioDevice::Flags::OutputMono)) {
            outChan++;
        }

        if (format.flags & static_cast<uint32_t >(AudioDevice::Flags::OutPutStereo)) {
            outChan = 2;
        }
        /* Open an audio I/O stream. */
        PaError err = Pa_OpenDefaultStream(&stream,
                                           inChan,          /* no input channels */
                                           outChan,          /* stereo output */
                                           paInt16,  /* TODO:M.P only 16bit samples are supported */
                                           format.sampleRate_Hz,
                                           paFramesPerBufferUnspecified, /* frames per buffer, i.e. the number
                                                   of sample frames that PortAudio will
                                                   request from the callback. Many apps
                                                   may want to use
                                                   paFramesPerBufferUnspecified, which
                                                   tells PortAudio to pick the best,
                                                   possibly changing, buffer size.*/
                                           portAudioCallback, /* this is your callback function */
                                           this); /*This is a pointer that will be passed to
                                                   your callback*/

        if (err != paNoError) {
            LOG_ERROR("PortAudio error: %s\n", Pa_GetErrorText(err));
            return false;
        } else {
            return true;
        }

    }

    bool LinuxCellularAudio::IsFormatSupported(const bsp::AudioDevice::Format &format) {
        auto ret = TryOpenStream(format);
        if (ret) {
            Stop();
            return true;
        } else {
            return false;
        }

    }
}