SamplePlayer.cc

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#include "SamplePlayer.hh"
#include "DeviceConfig.hh"
#include "CliComm.hh"
#include "FileContext.hh"
#include "MSXException.hh"
#include "serialize.hh"
#include "xrange.hh"
#include <cassert>
#include <memory>
 
namespace openmsx {
 
constexpr unsigned DUMMY_INPUT_RATE = 44100; // actual rate depends on .wav files
 
[[nodiscard]] static auto loadSamples(
        std::string_view name, const DeviceConfig& config,
        std::string_view baseName, std::string_view alternativeName,
        unsigned numSamples)
{
        dynarray<WavData> result(numSamples); // initialize with empty WAVs
 
        bool alreadyWarned = false;
        const auto& context = systemFileContext();
        for (auto i : xrange(numSamples)) {
                try {
                        auto filename = tmpStrCat(baseName, i, ".wav");
                        result[i] = WavData(context.resolve(filename));
                } catch (MSXException& e1) {
                        try {
                                if (alternativeName.empty()) throw;
                                auto filename = tmpStrCat(
                                        alternativeName, i, ".wav");
                                result[i] = WavData(context.resolve(filename));
                        } catch (MSXException& /*e2*/) {
                                if (!alreadyWarned) {
                                        alreadyWarned = true;
                                        // print message from the 1st error
                                        config.getCliComm().printWarning(
                                                "Couldn't read ", name, " sample data: ",
                                                e1.getMessage(),
                                                ". Continuing without sample data.");
                                }
                        }
                }
        }
        return result;
}
 
SamplePlayer::SamplePlayer(const std::string& name_, static_string_view desc,
                           const DeviceConfig& config,
                           std::string_view samplesBaseName, unsigned numSamples,
                           std::string_view alternativeName)
        : ResampledSoundDevice(config.getMotherBoard(), name_, desc, 1, DUMMY_INPUT_RATE, false)
        , samples(loadSamples(name_, config, samplesBaseName, alternativeName, numSamples))
        , index(0) // avoid UMR on serialize
{
        registerSound(config);
        reset();
}
 
SamplePlayer::~SamplePlayer()
{
        unregisterSound();
}
 
void SamplePlayer::reset()
{
        currentSampleNum = unsigned(-1);
        stopRepeat();
}
 
void SamplePlayer::play(unsigned sampleNum)
{
        assert(sampleNum < samples.size());
        currentSampleNum = sampleNum;
        index = 0;
        setWavParams();
}
 
void SamplePlayer::setWavParams()
{
        if ((currentSampleNum < samples.size()) &&
            samples[currentSampleNum].getSize()) {
                const auto& wav = samples[currentSampleNum];
                bufferSize = wav.getSize();
 
                unsigned freq = wav.getFreq();
                if (freq != getInputRate()) {
                        // this potentially switches resampler, so there might be
                        // some dropped samples if this is done in the middle of
                        // playing, though this shouldn't happen often (or at all)
                        setInputRate(freq);
                        createResampler();
                }
        } else {
                reset();
        }
}
 
void SamplePlayer::repeat(unsigned sampleNum)
{
        assert(sampleNum < samples.size());
        nextSampleNum = sampleNum;
        if (!isPlaying()) {
                doRepeat();
        }
}
 
void SamplePlayer::generateChannels(float** bufs, unsigned num)
{
        // Single channel device: replace content of bufs[0] (not add to it).
        if (!isPlaying()) {
                bufs[0] = nullptr;
                return;
        }
 
        const auto& wav = samples[currentSampleNum];
        for (auto i : xrange(num)) {
                if (index >= bufferSize) {
                        if (nextSampleNum != unsigned(-1)) {
                                doRepeat();
                        } else {
                                currentSampleNum = unsigned(-1);
                                // fill remaining buffer with zeros
                                do {
                                        bufs[0][i++] = 0.0f;
                                } while (i < num);
                                break;
                        }
                }
                bufs[0][i] = 3 * wav.getSample(index++);
        }
}
 
void SamplePlayer::doRepeat()
{
        play(nextSampleNum);
}
 
template<typename Archive>
void SamplePlayer::serialize(Archive& ar, unsigned /*version*/)
{
        ar.serialize("index",            index,
                     "currentSampleNum", currentSampleNum,
                     "nextSampleNum",    nextSampleNum);
        if constexpr (Archive::IS_LOADER) {
                setWavParams();
        }
}
INSTANTIATE_SERIALIZE_METHODS(SamplePlayer);
 
} // namespace openmsx