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