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Kernel: Set audio sample rate to 44.1 KHz by default
Ideally, we would want the audio controller to run a channel at a device's initial sample rate instead of hardcoding 44.1 KHz. However, most audio is provided at 44.1 KHz and as long as `Audio::Resampler` introduces significant audio artifacts, let's set a sensible sample rate that offers a better experience for most users. This can be removed after someone implements a higher quality `Audio::Resampler`.
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2 changed files with 11 additions and 3 deletions
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@ -86,8 +86,6 @@ UNMAP_AFTER_INIT ErrorOr<void> AC97::initialize(Badge<AudioManagement>)
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dbgln_if(AC97_DEBUG, "AC97 @ {}: mixer base: {:#04x}", device_identifier().address(), m_mixer_io_window);
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dbgln_if(AC97_DEBUG, "AC97 @ {}: bus base: {:#04x}", device_identifier().address(), m_bus_io_window);
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m_audio_channel = TRY(AudioChannel::create(*this, 0));
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// Read out AC'97 codec revision and vendor
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auto extended_audio_id = m_mixer_io_window->read16(NativeAudioMixerRegister::ExtendedAudioID);
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m_codec_revision = static_cast<AC97Revision>(((extended_audio_id & ExtendedAudioMask::Revision) >> 10) & 0b11);
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@ -133,6 +131,8 @@ UNMAP_AFTER_INIT ErrorOr<void> AC97::initialize(Badge<AudioManagement>)
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m_pcm_out_channel->reset();
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enable_irq();
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m_audio_channel = TRY(AudioChannel::create(*this, 0));
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return {};
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}
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