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AudioServer: Make hardware write buffer size flexible

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This removes some old cruft to refactor the hardware buffer-related
datastructures into depending on a single constant, which determines the
number of samples per hardware buffer that the audio server mixes. This
is set to 1024 as before, so there are no functional changes.
This commit is contained in:
kleines Filmröllchen 2022-06-15 21:43:07 +02:00 • committed by Linus Groh
parent f6af357763
commit 1c23a222b2
2 changed files with 11 additions and 12 deletions
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17
Userland/Services/AudioServer/Mixer.cpp
View file

@ -20,8 +20,6 @@
namespace AudioServer {
u8 Mixer::m_zero_filled_buffer[4096];
Mixer::Mixer(NonnullRefPtr<Core::ConfigFile> config)
// FIXME: Allow AudioServer to use other audio channels as well
: m_device(Core::File::construct("/dev/audio/0", this))
@ -74,8 +72,7 @@ void Mixer::mix()
active_mix_queues.remove_all_matching([&](auto& entry) { return !entry->client(); });
Audio::Sample mixed_buffer[1024];
auto mixed_buffer_length = (int)(sizeof(mixed_buffer) / sizeof(Audio::Sample));
Array<Audio::Sample, HARDWARE_BUFFER_SIZE> mixed_buffer;
m_main_volume.advance_time();
@ -89,8 +86,7 @@ void Mixer::mix()
++active_queues;
queue->volume().advance_time();
for (int i = 0; i < mixed_buffer_length; ++i) {
auto& mixed_sample = mixed_buffer[i];
for (auto& mixed_sample : mixed_buffer) {
Audio::Sample sample;
if (!queue->get_next_sample(sample))
break;
@ -103,13 +99,12 @@ void Mixer::mix()
}
if (m_muted) {
m_device->write(m_zero_filled_buffer, sizeof(m_zero_filled_buffer));
m_device->write(m_zero_filled_buffer.data(), static_cast<int>(m_zero_filled_buffer.size()));
} else {
Array<u8, 4096> buffer;
Array<u8, HARDWARE_BUFFER_SIZE_BYTES> buffer;
OutputMemoryStream stream { buffer };
for (int i = 0; i < mixed_buffer_length; ++i) {
auto& mixed_sample = mixed_buffer[i];
for (auto& mixed_sample : mixed_buffer) {
// Even though it's not realistic, the user expects no sound at 0%.
if (m_main_volume < 0.01)
@ -128,7 +123,7 @@ void Mixer::mix()
VERIFY(stream.is_end());
VERIFY(!stream.has_any_error());
m_device->write(stream.data(), stream.size());
m_device->write(stream.data(), static_cast<int>(stream.size()));
}
}
}