mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 12:18:55 +01:00
260 lines
7.7 KiB
C++
Vendored
260 lines
7.7 KiB
C++
Vendored
// Copyright 2021 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "binding_android.h"
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#include "_cgo_export.h"
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#include "oboe_oboe_Oboe_android.h"
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#include <atomic>
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#include <set>
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#include <vector>
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namespace {
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class Player : public oboe::AudioStreamDataCallback {
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public:
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static const char* Suspend() {
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std::lock_guard<std::mutex> lock(PlayersMutex());
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for (Player* player : GetPlayers()) {
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if (!player->IsPlaying()) {
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continue;
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}
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// Close should be called rather than Pause for onPause.
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// https://github.com/google/oboe/blob/master/docs/GettingStarted.md
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if (const char* msg = player->Close(); msg) {
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return msg;
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}
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GetPlayersToResume().insert(player);
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}
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return nullptr;
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}
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static const char* Resume() {
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std::lock_guard<std::mutex> lock(PlayersMutex());
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for (Player* player : GetPlayersToResume()) {
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if (const char* msg = player->Play(); msg) {
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return msg;
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}
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}
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GetPlayersToResume().clear();
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return nullptr;
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}
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Player(int sample_rate, int channel_num, int bit_depth_in_bytes, double volume, uintptr_t go_player)
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: sample_rate_{sample_rate},
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channel_num_{channel_num},
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bit_depth_in_bytes_{bit_depth_in_bytes},
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go_player_{go_player} {
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std::atomic_store(&volume_, volume);
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{
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std::lock_guard<std::mutex> lock(PlayersMutex());
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GetPlayers().insert(this);
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}
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}
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void SetVolume(double volume) {
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std::atomic_store(&volume_, volume);
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}
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bool IsPlaying() {
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return stream_->getState() == oboe::StreamState::Started;
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}
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void AppendBuffer(uint8_t* data, int length) {
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// Sync this constants with internal/readerdriver/driver.go
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const size_t bytes_per_sample = channel_num_ * bit_depth_in_bytes_;
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const size_t one_buffer_size = sample_rate_ * channel_num_ * bit_depth_in_bytes_ / 4 / bytes_per_sample * bytes_per_sample;
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const size_t max_buffer_size = one_buffer_size * 2;
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std::lock_guard<std::mutex> lock(mutex_);
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buf_.insert(buf_.end(), data, data + length);
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}
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const char* Play() {
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if (bit_depth_in_bytes_ != 2) {
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return "bit_depth_in_bytes_ must be 2 but not";
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}
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if (!stream_) {
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oboe::AudioStreamBuilder builder;
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oboe::Result result = builder.setDirection(oboe::Direction::Output)
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->setPerformanceMode(oboe::PerformanceMode::LowLatency)
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->setSharingMode(oboe::SharingMode::Shared)
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->setFormat(oboe::AudioFormat::I16)
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->setChannelCount(channel_num_)
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->setSampleRate(sample_rate_)
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->setDataCallback(this)
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->openStream(stream_);
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if (result != oboe::Result::OK) {
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return oboe::convertToText(result);
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}
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}
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if (stream_->getSharingMode() != oboe::SharingMode::Shared) {
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return "oboe::SharingMode::Shared is not available";
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}
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// What if the buffer size is not enough?
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if (oboe::Result result = stream_->start(); result != oboe::Result::OK) {
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return oboe::convertToText(result);
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}
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return nullptr;
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}
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const char* Pause() {
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if (!stream_) {
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return nullptr;
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}
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if (oboe::Result result = stream_->pause(); result != oboe::Result::OK) {
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return oboe::convertToText(result);
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}
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return nullptr;
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}
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const char* Close() {
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if (!stream_) {
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return nullptr;
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}
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if (oboe::Result result = stream_->stop(); result != oboe::Result::OK) {
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return oboe::convertToText(result);
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}
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if (oboe::Result result = stream_->close(); result != oboe::Result::OK) {
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return oboe::convertToText(result);
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}
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stream_.reset();
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return nullptr;
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}
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const char* CloseAndRemove() {
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// Close and remove self from the players atomically.
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// Otherwise, a removed player might be resumed at Resume unexpectedly.
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std::lock_guard<std::mutex> lock(PlayersMutex());
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const char* msg = Close();
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GetPlayers().erase(this);
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return msg;
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}
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int GetUnplayedBufferSize() {
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std::lock_guard<std::mutex> lock(mutex_);
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return buf_.size();
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}
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oboe::DataCallbackResult onAudioReady(oboe::AudioStream *oboe_stream, void *audio_data, int32_t num_frames) override {
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size_t num_bytes = num_frames * channel_num_ * bit_depth_in_bytes_;
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std::vector<uint8_t> buf(num_bytes);
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{
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// TODO: Do not use a lock in onAudioReady.
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// https://google.github.io/oboe/reference/classoboe_1_1_audio_stream_data_callback.html#ad8a3a9f609df5fd3a5d885cbe1b2204d
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std::lock_guard<std::mutex> lock(mutex_);
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size_t copy_bytes = std::min(num_bytes, buf_.size());
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std::copy(buf_.begin(), buf_.begin() + copy_bytes, buf.begin());
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buf_.erase(buf_.begin(), buf_.begin() + copy_bytes);
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onWrittenCallback(go_player_);
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}
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if (const double volume = std::atomic_load(&volume_); volume < 1) {
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for (int i = 0; i < buf.size()/2; i++) {
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int16_t v = static_cast<int16_t>(buf[2*i]) | (static_cast<int16_t>(buf[2*i+1]) << 8);
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v = static_cast<int16_t>(static_cast<double>(v) * volume);
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buf[2*i] = static_cast<uint8_t>(v);
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buf[2*i+1] = static_cast<uint8_t>(v >> 8);
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}
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}
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std::copy(buf.begin(), buf.end(), reinterpret_cast<uint8_t*>(audio_data));
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return oboe::DataCallbackResult::Continue;
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}
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private:
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static std::set<Player*>& GetPlayers() {
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static std::set<Player*> players;
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return players;
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}
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static std::set<Player*>& GetPlayersToResume() {
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static std::set<Player*> players_to_resume;
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return players_to_resume;
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}
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static std::mutex& PlayersMutex() {
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static std::mutex mutex;
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return mutex;
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}
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const int sample_rate_;
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const int channel_num_;
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const int bit_depth_in_bytes_;
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const uintptr_t go_player_;
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std::atomic<double> volume_{1.0};
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std::vector<uint8_t> buf_;
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std::mutex mutex_;
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std::shared_ptr<oboe::AudioStream> stream_;
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};
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} // namespace
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extern "C" {
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const char* Suspend() {
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return Player::Suspend();
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}
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const char* Resume() {
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return Player::Resume();
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}
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PlayerID Player_Create(int sample_rate, int channel_num, int bit_depth_in_bytes, double volume, uintptr_t go_player) {
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Player* p = new Player(sample_rate, channel_num, bit_depth_in_bytes, volume, go_player);
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return reinterpret_cast<PlayerID>(p);
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}
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bool Player_IsPlaying(PlayerID audio_player) {
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Player* p = reinterpret_cast<Player*>(audio_player);
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return p->IsPlaying();
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}
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void Player_AppendBuffer(PlayerID audio_player, uint8_t* data, int length) {
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Player* p = reinterpret_cast<Player*>(audio_player);
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p->AppendBuffer(data, length);
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}
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const char* Player_Play(PlayerID audio_player) {
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Player* p = reinterpret_cast<Player*>(audio_player);
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return p->Play();
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}
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const char* Player_Pause(PlayerID audio_player) {
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Player* p = reinterpret_cast<Player*>(audio_player);
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return p->Pause();
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}
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void Player_SetVolume(PlayerID audio_player, double volume) {
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Player* p = reinterpret_cast<Player*>(audio_player);
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p->SetVolume(volume);
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}
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const char* Player_Close(PlayerID audio_player) {
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Player* p = reinterpret_cast<Player*>(audio_player);
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const char* msg = p->CloseAndRemove();
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delete p;
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return msg;
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}
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int Player_UnplayedBufferSize(PlayerID audio_player) {
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Player* p = reinterpret_cast<Player*>(audio_player);
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return p->GetUnplayedBufferSize();
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}
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} // extern "C"
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