audio_source.cpp

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// This file is part of playd.
// playd is licensed under the MIT licence: see LICENSE.txt.

#include <cstdint>
#include <string>

#include "audio_source.hpp"
#include "sample_formats.hpp"

AudioSource::AudioSource(const std::string &path) : path(path)
{
}

size_t AudioSource::BytesPerSample() const
{
    auto sf = static_cast<uint8_t>(this->OutputSampleFormat());
    return SAMPLE_FORMAT_BPS[sf] * this->ChannelCount();
}

const std::string &AudioSource::Path() const
{
    return this->path;
}

std::uint64_t AudioSource::SamplesFromMicros(std::uint64_t micros) const
{
    // The sample rate is expressed in terms of samples per second, so we
    // need to convert the position to seconds then multiply by the rate.
    // We do things in a slightly peculiar order to minimise rounding.

    return (micros * this->SampleRate()) / 1000000;
}

std::uint64_t AudioSource::MicrosFromSamples(std::uint64_t samples) const
{
    // This is basically SamplesFromMicros but backwards.

    return (samples * 1000000) / this->SampleRate();
}