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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/sink_stream.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 std::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;
}
UNIMPLEMENTED_MSG("Unimplemented format={}", static_cast<u32>(format));
return {};
}
Stream::Stream(Core::Timing::CoreTiming& core_timing, 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}, core_timing{core_timing}, name{std::move(name_)} {
release_event = Core::Timing::CreateEvent(
name, [this](u64 userdata, s64 cycles_late) { ReleaseActiveBuffer(); });
}
void Stream::Play() {
state = State::Playing;
PlayNextBuffer();
}
void Stream::Stop() {
state = State::Stopped;
UNIMPLEMENTED();
}
void Stream::SetVolume(float volume) {
game_volume = volume;
}
Stream::State Stream::GetState() const {
return state;
}
s64 Stream::GetBufferReleaseNS(const Buffer& buffer) const {
const std::size_t num_samples{buffer.GetSamples().size() / GetNumChannels()};
const auto ns =
std::chrono::nanoseconds((static_cast<u64>(num_samples) * 1000000000ULL) / sample_rate);
return ns.count();
}
s64 Stream::GetBufferReleaseNSHostTiming(const Buffer& buffer) const {
const std::size_t num_samples{buffer.GetSamples().size() / GetNumChannels()};
/// DSP signals before playing the last sample, in HLE we emulate this in this way
s64 base_samples = std::max<s64>(static_cast<s64>(num_samples) - 1, 0);
const auto ns =
std::chrono::nanoseconds((static_cast<u64>(base_samples) * 1000000000ULL) / sample_rate);
return ns.count();
}
static void VolumeAdjustSamples(std::vector<s16>& samples, float game_volume) {
const float volume{std::clamp(Settings::Volume() - (1.0f - game_volume), 0.0f, 1.0f)};
if (volume == 1.0f) {
return;
}
// Implementation of a volume slider with a dynamic range of 60 dB
const float volume_scale_factor = volume == 0 ? 0 : std::exp(6.90775f * volume) * 0.001f;
for (auto& sample : samples) {
sample = static_cast<s16>(sample * volume_scale_factor);
}
}
void Stream::PlayNextBuffer() {
if (!IsPlaying()) {
// Ensure we are in playing state before playing the next buffer
sink_stream.Flush();
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
sink_stream.Flush();
return;
}
active_buffer = queued_buffers.front();
queued_buffers.pop();
VolumeAdjustSamples(active_buffer->GetSamples(), game_volume);
sink_stream.EnqueueSamples(GetNumChannels(), active_buffer->GetSamples());
if (core_timing.IsHostTiming()) {
core_timing.ScheduleEvent(GetBufferReleaseNSHostTiming(*active_buffer), release_event, {});
} else {
core_timing.ScheduleEvent(GetBufferReleaseNS(*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 {
UNIMPLEMENTED();
return {};
}
std::vector<Buffer::Tag> Stream::GetTagsAndReleaseBuffers(std::size_t max_count) {
std::vector<Buffer::Tag> tags;
for (std::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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