audiooutputnull.cpp

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#include "audiooutputnull.h"
 
#include <algorithm>
#include <cstddef>
#include <cstdint>
 
#include "libmythbase/mythlogging.h"
 
static constexpr uint8_t CHANNELS_MIN { 1 };
static constexpr uint8_t CHANNELS_MAX { 8 };
 
AudioOutputNULL::AudioOutputNULL(const AudioSettings &settings) :
    AudioOutputBase(settings)
{
    InitSettings(settings);
    if (settings.m_init)
        Reconfigure(settings);
}
 
AudioOutputNULL::~AudioOutputNULL()
{
    KillAudio();
}
 
bool AudioOutputNULL::OpenDevice()
{
    LOG(VB_GENERAL, LOG_INFO, "Opening NULL audio device, will fail.");
 
    m_fragmentSize = NULLAUDIO_OUTPUT_BUFFER_SIZE / 2;
    m_soundcardBufferSize = NULLAUDIO_OUTPUT_BUFFER_SIZE;
 
    return false;
}
 
void AudioOutputNULL::CloseDevice()
{
}
 
AudioOutputSettings* AudioOutputNULL::GetOutputSettings(bool /*digital*/)
{
    // Pretend that we support everything
    auto *settings = new AudioOutputSettings();
 
    // NOLINTNEXTLINE(bugprone-infinite-loop)
    while (int rate = settings->GetNextRate())
    {
        settings->AddSupportedRate(rate);
    }
 
    // NOLINTNEXTLINE(bugprone-infinite-loop)
    while (AudioFormat fmt = settings->GetNextFormat())
    {
        settings->AddSupportedFormat(fmt);
    }
 
    for (unsigned channels = CHANNELS_MIN; channels <= CHANNELS_MAX; channels++)
    {
        settings->AddSupportedChannels(channels);
    }
 
    settings->setPassthrough(-1);   // no passthrough
 
    return settings;
}
 
 
void AudioOutputNULL::WriteAudio(unsigned char* aubuf, int size)
{
    if (m_bufferOutputDataForUse)
    {
        if (size + m_pcmOutputBuffer.size() > NULLAUDIO_OUTPUT_BUFFER_SIZE)
        {
            LOG(VB_GENERAL, LOG_ERR, "null audio output should not have just "
                                     "had data written to it");
            return;
        }
        m_pcmOutputBufferMutex.lock();
        m_pcmOutputBuffer.insert(m_pcmOutputBuffer.end(), aubuf, aubuf+size);
        m_pcmOutputBufferMutex.unlock();
    }
}
 
int AudioOutputNULL::readOutputData(unsigned char *read_buffer, size_t max_length)
{
    size_t amount_to_read = std::min(max_length, m_pcmOutputBuffer.size());
 
    m_pcmOutputBufferMutex.lock();
    std::copy(m_pcmOutputBuffer.cbegin(),
              m_pcmOutputBuffer.cbegin() + amount_to_read,
              read_buffer);
    m_pcmOutputBuffer.erase(m_pcmOutputBuffer.cbegin(),
              m_pcmOutputBuffer.cbegin() + amount_to_read);
    m_pcmOutputBufferMutex.unlock();
 
    return amount_to_read;
}
 
void AudioOutputNULL::Reset()
{
    if (m_bufferOutputDataForUse)
    {
        m_pcmOutputBufferMutex.lock();
        m_pcmOutputBuffer.clear();
        m_pcmOutputBufferMutex.unlock();
    }
    AudioOutputBase::Reset();
}
 
int AudioOutputNULL::GetBufferedOnSoundcard(void) const
{
    if (m_bufferOutputDataForUse)
        return m_pcmOutputBuffer.size();
 
    return 0;
}