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// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <cmath>
#include "audio_core/sink.h"
#include "audio_core/sink_details.h"
#include "audio_core/stream.h"
#include "common/assert.h"
#include "common/logging/log.h"
#include "core/core_timing.h"
#include "core/core_timing_util.h"
#include "core/settings.h"
namespace AudioCore {
constexpr size_t MaxAudioBufferCount{32};
u32 Stream::GetNumChannels() const {
switch (format) {
case Format::Mono16:
return 1;
case Format::Stereo16:
return 2;
case Format::Multi51Channel16:
return 6;
}
LOG_CRITICAL(Audio, "Unimplemented format={}", static_cast<u32>(format));
UNREACHABLE();
return {};
}
u32 Stream::GetSampleSize() const {
return GetNumChannels() * 2;
}
Stream::Stream(u32 sample_rate, Format format, ReleaseCallback&& release_callback,
SinkStream& sink_stream, std::string&& name_)
: sample_rate{sample_rate}, format{format}, release_callback{std::move(release_callback)},
sink_stream{sink_stream}, name{std::move(name_)} {
release_event = CoreTiming::RegisterEvent(
name, [this](u64 userdata, int cycles_late) { ReleaseActiveBuffer(); });
}
void Stream::Play() {
state = State::Playing;
PlayNextBuffer();
}
void Stream::Stop() {
ASSERT_MSG(false, "Unimplemented");
}
s64 Stream::GetBufferReleaseCycles(const Buffer& buffer) const {
const size_t num_samples{buffer.GetData().size() / GetSampleSize()};
return CoreTiming::usToCycles((static_cast<u64>(num_samples) * 1000000) / sample_rate);
}
static std::vector<s16> GetVolumeAdjustedSamples(const std::vector<u8>& data) {
std::vector<s16> samples(data.size() / sizeof(s16));
std::memcpy(samples.data(), data.data(), data.size());
const float volume{std::clamp(Settings::values.volume, 0.0f, 1.0f)};
if (volume == 1.0f) {
return samples;
}
// Implementation of a volume slider with a dynamic range of 60 dB
const float volume_scale_factor{std::exp(6.90775f * volume) * 0.001f};
for (auto& sample : samples) {
sample = static_cast<s16>(sample * volume_scale_factor);
}
return samples;
}
void Stream::PlayNextBuffer() {
if (!IsPlaying()) {
// Ensure we are in playing state before playing the next buffer
return;
}
if (active_buffer) {
// Do not queue a new buffer if we are already playing a buffer
return;
}
if (queued_buffers.empty()) {
// No queued buffers - we are effectively paused
return;
}
active_buffer = queued_buffers.front();
queued_buffers.pop();
const size_t sample_count{active_buffer->GetData().size() / GetSampleSize()};
sink_stream.EnqueueSamples(
GetNumChannels(), GetVolumeAdjustedSamples(active_buffer->GetData()).data(), sample_count);
CoreTiming::ScheduleEventThreadsafe(GetBufferReleaseCycles(*active_buffer), release_event, {});
}
void Stream::ReleaseActiveBuffer() {
ASSERT(active_buffer);
released_buffers.push(std::move(active_buffer));
release_callback();
PlayNextBuffer();
}
bool Stream::QueueBuffer(BufferPtr&& buffer) {
if (queued_buffers.size() < MaxAudioBufferCount) {
queued_buffers.push(std::move(buffer));
PlayNextBuffer();
return true;
}
return false;
}
bool Stream::ContainsBuffer(Buffer::Tag tag) const {
ASSERT_MSG(false, "Unimplemented");
return {};
}
std::vector<Buffer::Tag> Stream::GetTagsAndReleaseBuffers(size_t max_count) {
std::vector<Buffer::Tag> tags;
for (size_t count = 0; count < max_count && !released_buffers.empty(); ++count) {
tags.push_back(released_buffers.front()->GetTag());
released_buffers.pop();
}
return tags;
}
} // namespace AudioCore
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