mirror of
https://github.com/OpenRCT2/OpenRCT2
synced 2026-01-24 23:34:37 +01:00
514 lines
18 KiB
C++
514 lines
18 KiB
C++
/*****************************************************************************
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* Copyright (c) 2014-2018 OpenRCT2 developers
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*
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* For a complete list of all authors, please refer to contributors.md
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* Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
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*
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* OpenRCT2 is licensed under the GNU General Public License version 3.
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*****************************************************************************/
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#include "AudioContext.h"
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#include "AudioFormat.h"
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#include <SDL.h>
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#include <algorithm>
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#include <iterator>
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#include <list>
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#include <openrct2/Context.h>
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#include <openrct2/OpenRCT2.h>
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#include <openrct2/audio/AudioChannel.h>
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#include <openrct2/audio/AudioMixer.h>
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#include <openrct2/audio/AudioSource.h>
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#include <openrct2/audio/audio.h>
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#include <openrct2/common.h>
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#include <openrct2/config/Config.h>
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#include <openrct2/core/Guard.hpp>
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#include <openrct2/localisation/Localisation.h>
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#include <openrct2/platform/platform.h>
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#include <speex/speex_resampler.h>
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#include <vector>
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namespace OpenRCT2::Audio
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{
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class AudioMixerImpl final : public IAudioMixer
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{
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private:
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IAudioSource* _nullSource = nullptr;
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SDL_AudioDeviceID _deviceId = 0;
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AudioFormat _format = {};
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std::list<ISDLAudioChannel*> _channels;
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float _volume = 1.0f;
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float _adjustSoundVolume = 0.0f;
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float _adjustMusicVolume = 0.0f;
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uint8_t _settingSoundVolume = 0xFF;
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uint8_t _settingMusicVolume = 0xFF;
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IAudioSource* _css1Sources[SOUND_MAXID] = { nullptr };
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IAudioSource* _musicSources[PATH_ID_END] = { nullptr };
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std::vector<uint8_t> _channelBuffer;
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std::vector<uint8_t> _convertBuffer;
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std::vector<uint8_t> _effectBuffer;
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public:
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AudioMixerImpl()
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{
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_nullSource = AudioSource::CreateNull();
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}
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~AudioMixerImpl()
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{
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Close();
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delete _nullSource;
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}
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void Init(const char* device) override
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{
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Close();
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SDL_AudioSpec want = {};
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want.freq = 22050;
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want.format = AUDIO_S16SYS;
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want.channels = 2;
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want.samples = 2048;
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want.callback = [](void* arg, uint8_t* dst, int32_t length) -> void {
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auto mixer = static_cast<AudioMixerImpl*>(arg);
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mixer->GetNextAudioChunk(dst, (size_t)length);
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};
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want.userdata = this;
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SDL_AudioSpec have;
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_deviceId = SDL_OpenAudioDevice(device, 0, &want, &have, 0);
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_format.format = have.format;
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_format.channels = have.channels;
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_format.freq = have.freq;
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LoadAllSounds();
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SDL_PauseAudioDevice(_deviceId, 0);
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}
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void Close() override
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{
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// Free channels
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Lock();
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for (IAudioChannel* channel : _channels)
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{
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delete channel;
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}
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_channels.clear();
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Unlock();
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SDL_CloseAudioDevice(_deviceId);
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// Free sources
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for (size_t i = 0; i < std::size(_css1Sources); i++)
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{
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if (_css1Sources[i] != _nullSource)
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{
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SafeDelete(_css1Sources[i]);
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}
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}
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for (size_t i = 0; i < std::size(_musicSources); i++)
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{
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if (_musicSources[i] != _nullSource)
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{
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SafeDelete(_musicSources[i]);
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}
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}
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// Free buffers
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_channelBuffer.clear();
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_channelBuffer.shrink_to_fit();
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_convertBuffer.clear();
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_convertBuffer.shrink_to_fit();
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_effectBuffer.clear();
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_effectBuffer.shrink_to_fit();
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}
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void Lock() override
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{
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SDL_LockAudioDevice(_deviceId);
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}
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void Unlock() override
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{
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SDL_UnlockAudioDevice(_deviceId);
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}
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IAudioChannel* Play(IAudioSource* source, int32_t loop, bool deleteondone, bool deletesourceondone) override
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{
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Lock();
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ISDLAudioChannel* channel = AudioChannel::Create();
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if (channel != nullptr)
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{
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channel->Play(source, loop);
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channel->SetDeleteOnDone(deleteondone);
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channel->SetDeleteSourceOnDone(deletesourceondone);
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_channels.push_back(channel);
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}
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Unlock();
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return channel;
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}
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void Stop(IAudioChannel* channel) override
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{
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Lock();
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channel->SetStopping(true);
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Unlock();
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}
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bool LoadMusic(size_t pathId) override
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{
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bool result = false;
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if (pathId < std::size(_musicSources))
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{
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IAudioSource* source = _musicSources[pathId];
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if (source == nullptr)
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{
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const utf8* path = context_get_path_legacy((int32_t)pathId);
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source = AudioSource::CreateMemoryFromWAV(path, &_format);
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if (source == nullptr)
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{
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source = _nullSource;
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}
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_musicSources[pathId] = source;
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}
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result = source != _nullSource;
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}
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return result;
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}
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void SetVolume(float volume) override
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{
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_volume = volume;
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}
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IAudioSource* GetSoundSource(int32_t id) override
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{
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return _css1Sources[id];
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}
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IAudioSource* GetMusicSource(int32_t id) override
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{
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return _musicSources[id];
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}
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private:
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void LoadAllSounds()
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{
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const utf8* css1Path = context_get_path_legacy(PATH_ID_CSS1);
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for (size_t i = 0; i < std::size(_css1Sources); i++)
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{
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auto source = AudioSource::CreateMemoryFromCSS1(css1Path, i, &_format);
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if (source == nullptr)
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{
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source = _nullSource;
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}
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_css1Sources[i] = source;
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}
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}
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void GetNextAudioChunk(uint8_t* dst, size_t length)
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{
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UpdateAdjustedSound();
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// Zero the output buffer
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std::fill_n(dst, length, 0);
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// Mix channels onto output buffer
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auto it = _channels.begin();
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while (it != _channels.end())
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{
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auto channel = *it;
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int32_t group = channel->GetGroup();
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if (group != MIXER_GROUP_SOUND || gConfigSound.sound_enabled)
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{
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MixChannel(channel, dst, length);
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}
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if ((channel->IsDone() && channel->DeleteOnDone()) || channel->IsStopping())
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{
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delete channel;
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it = _channels.erase(it);
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}
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else
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{
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it++;
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}
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}
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}
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void UpdateAdjustedSound()
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{
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// Did the volume level get changed? Recalculate level in this case.
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if (_settingSoundVolume != gConfigSound.sound_volume)
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{
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_settingSoundVolume = gConfigSound.sound_volume;
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_adjustSoundVolume = powf(_settingSoundVolume / 100.f, 10.f / 6.f);
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}
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if (_settingMusicVolume != gConfigSound.ride_music_volume)
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{
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_settingMusicVolume = gConfigSound.ride_music_volume;
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_adjustMusicVolume = powf(_settingMusicVolume / 100.f, 10.f / 6.f);
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}
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}
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void MixChannel(ISDLAudioChannel* channel, uint8_t* data, size_t length)
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{
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int32_t byteRate = _format.GetByteRate();
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int32_t numSamples = (int32_t)(length / byteRate);
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double rate = 1;
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if (_format.format == AUDIO_S16SYS)
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{
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rate = channel->GetRate();
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}
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bool mustConvert = false;
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SDL_AudioCVT cvt;
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cvt.len_ratio = 1;
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AudioFormat streamformat = channel->GetFormat();
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if (streamformat != _format)
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{
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if (SDL_BuildAudioCVT(
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&cvt, streamformat.format, streamformat.channels, streamformat.freq, _format.format, _format.channels,
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_format.freq)
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== -1)
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{
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// Unable to convert channel data
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return;
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}
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mustConvert = true;
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}
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// Read raw PCM from channel
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int32_t readSamples = (int32_t)(numSamples * rate);
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size_t readLength = (size_t)(readSamples / cvt.len_ratio) * byteRate;
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_channelBuffer.resize(readLength);
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size_t bytesRead = channel->Read(_channelBuffer.data(), readLength);
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// Convert data to required format if necessary
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void* buffer = nullptr;
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size_t bufferLen = 0;
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if (mustConvert)
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{
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if (Convert(&cvt, _channelBuffer.data(), bytesRead))
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{
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buffer = cvt.buf;
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bufferLen = cvt.len_cvt;
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}
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else
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{
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return;
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}
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}
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else
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{
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buffer = _channelBuffer.data();
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bufferLen = bytesRead;
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}
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// Apply effects
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if (rate != 1)
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{
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int32_t inRate = (int32_t)(bufferLen / byteRate);
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int32_t outRate = numSamples;
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if (bytesRead != readLength)
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{
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inRate = _format.freq;
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outRate = _format.freq * (1 / rate);
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}
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_effectBuffer.resize(length);
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bufferLen = ApplyResample(channel, buffer, (int32_t)(bufferLen / byteRate), numSamples, inRate, outRate);
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buffer = _effectBuffer.data();
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}
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// Apply panning and volume
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ApplyPan(channel, buffer, bufferLen, byteRate);
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int32_t mixVolume = ApplyVolume(channel, buffer, bufferLen);
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// Finally mix on to destination buffer
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size_t dstLength = std::min(length, bufferLen);
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SDL_MixAudioFormat(data, (const uint8_t*)buffer, _format.format, (uint32_t)dstLength, mixVolume);
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channel->UpdateOldVolume();
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}
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/**
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* Resample the given buffer into _effectBuffer.
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* Assumes that srcBuffer is the same format as _format.
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*/
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size_t ApplyResample(
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ISDLAudioChannel* channel, const void* srcBuffer, int32_t srcSamples, int32_t dstSamples, int32_t inRate,
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int32_t outRate)
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{
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int32_t byteRate = _format.GetByteRate();
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// Create resampler
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SpeexResamplerState* resampler = channel->GetResampler();
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if (resampler == nullptr)
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{
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resampler = speex_resampler_init(_format.channels, _format.freq, _format.freq, 0, nullptr);
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channel->SetResampler(resampler);
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}
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speex_resampler_set_rate(resampler, inRate, outRate);
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uint32_t inLen = srcSamples;
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uint32_t outLen = dstSamples;
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speex_resampler_process_interleaved_int(
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resampler, (const spx_int16_t*)srcBuffer, &inLen, (spx_int16_t*)_effectBuffer.data(), &outLen);
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return outLen * byteRate;
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}
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void ApplyPan(const IAudioChannel* channel, void* buffer, size_t len, size_t sampleSize)
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{
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if (channel->GetPan() != 0.5f && _format.channels == 2)
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{
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switch (_format.format)
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{
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case AUDIO_S16SYS:
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EffectPanS16(channel, (int16_t*)buffer, (int32_t)(len / sampleSize));
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break;
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case AUDIO_U8:
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EffectPanU8(channel, (uint8_t*)buffer, (int32_t)(len / sampleSize));
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break;
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}
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}
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}
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int32_t ApplyVolume(const IAudioChannel* channel, void* buffer, size_t len)
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{
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float volumeAdjust = _volume;
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volumeAdjust *= gConfigSound.master_sound_enabled ? (gConfigSound.master_volume / 100.0f) : 0;
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switch (channel->GetGroup())
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{
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case MIXER_GROUP_SOUND:
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volumeAdjust *= _adjustSoundVolume;
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// Cap sound volume on title screen so music is more audible
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if (gScreenFlags & SCREEN_FLAGS_TITLE_DEMO)
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{
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volumeAdjust = std::min(volumeAdjust, 0.75f);
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}
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break;
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case MIXER_GROUP_RIDE_MUSIC:
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volumeAdjust *= _adjustMusicVolume;
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break;
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}
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int32_t startVolume = (int32_t)(channel->GetOldVolume() * volumeAdjust);
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int32_t endVolume = (int32_t)(channel->GetVolume() * volumeAdjust);
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if (channel->IsStopping())
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{
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endVolume = 0;
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}
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int32_t mixVolume = (int32_t)(channel->GetVolume() * volumeAdjust);
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if (startVolume != endVolume)
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{
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// Set to max since we are adjusting the volume ourselves
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mixVolume = MIXER_VOLUME_MAX;
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// Fade between volume levels to smooth out sound and minimize clicks from sudden volume changes
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int32_t fadeLength = (int32_t)len / _format.BytesPerSample();
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switch (_format.format)
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{
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case AUDIO_S16SYS:
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EffectFadeS16((int16_t*)buffer, fadeLength, startVolume, endVolume);
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break;
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case AUDIO_U8:
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EffectFadeU8((uint8_t*)buffer, fadeLength, startVolume, endVolume);
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break;
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}
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}
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return mixVolume;
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}
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static void EffectPanS16(const IAudioChannel* channel, int16_t* data, int32_t length)
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{
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const float dt = 1.0f / (length * 2);
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float volumeL = channel->GetOldVolumeL();
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float volumeR = channel->GetOldVolumeR();
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const float d_left = dt * (channel->GetVolumeL() - channel->GetOldVolumeL());
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const float d_right = dt * (channel->GetVolumeR() - channel->GetOldVolumeR());
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for (int32_t i = 0; i < length * 2; i += 2)
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{
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data[i] = (int16_t)(data[i] * volumeL);
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data[i + 1] = (int16_t)(data[i + 1] * volumeR);
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volumeL += d_left;
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volumeR += d_right;
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}
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}
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static void EffectPanU8(const IAudioChannel* channel, uint8_t* data, int32_t length)
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{
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float volumeL = channel->GetVolumeL();
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float volumeR = channel->GetVolumeR();
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float oldVolumeL = channel->GetOldVolumeL();
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float oldVolumeR = channel->GetOldVolumeR();
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for (int32_t i = 0; i < length * 2; i += 2)
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{
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float t = (float)i / (length * 2);
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data[i] = (uint8_t)(data[i] * ((1.0 - t) * oldVolumeL + t * volumeL));
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data[i + 1] = (uint8_t)(data[i + 1] * ((1.0 - t) * oldVolumeR + t * volumeR));
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}
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}
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static void EffectFadeS16(int16_t* data, int32_t length, int32_t startvolume, int32_t endvolume)
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{
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static_assert(SDL_MIX_MAXVOLUME == MIXER_VOLUME_MAX, "Max volume differs between OpenRCT2 and SDL2");
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float startvolume_f = (float)startvolume / SDL_MIX_MAXVOLUME;
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float endvolume_f = (float)endvolume / SDL_MIX_MAXVOLUME;
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for (int32_t i = 0; i < length; i++)
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{
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float t = (float)i / length;
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data[i] = (int16_t)(data[i] * ((1 - t) * startvolume_f + t * endvolume_f));
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}
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}
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static void EffectFadeU8(uint8_t* data, int32_t length, int32_t startvolume, int32_t endvolume)
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{
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static_assert(SDL_MIX_MAXVOLUME == MIXER_VOLUME_MAX, "Max volume differs between OpenRCT2 and SDL2");
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float startvolume_f = (float)startvolume / SDL_MIX_MAXVOLUME;
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float endvolume_f = (float)endvolume / SDL_MIX_MAXVOLUME;
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for (int32_t i = 0; i < length; i++)
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{
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float t = (float)i / length;
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data[i] = (uint8_t)(data[i] * ((1 - t) * startvolume_f + t * endvolume_f));
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}
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}
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bool Convert(SDL_AudioCVT* cvt, const void* src, size_t len)
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{
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// tofix: there seems to be an issue with converting audio using SDL_ConvertAudio in the callback vs preconverted,
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// can cause pops and static depending on sample rate and channels
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bool result = false;
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if (len != 0 && cvt->len_mult != 0)
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{
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size_t reqConvertBufferCapacity = len * cvt->len_mult;
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_convertBuffer.resize(reqConvertBufferCapacity);
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std::copy_n((const uint8_t*)src, len, _convertBuffer.data());
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cvt->len = (int32_t)len;
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cvt->buf = (uint8_t*)_convertBuffer.data();
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if (SDL_ConvertAudio(cvt) >= 0)
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{
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result = true;
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}
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}
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return result;
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}
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};
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IAudioMixer* AudioMixer::Create()
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{
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return new AudioMixerImpl();
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}
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} // namespace OpenRCT2::Audio
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