170 lines
3.9 KiB
C++
170 lines
3.9 KiB
C++
/*******************************************************************************
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* Copyright 2009-2016 Jörg Müller
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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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******************************************************************************/
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#include "SDLDevice.h"
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#include "devices/DeviceManager.h"
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#include "devices/IDeviceFactory.h"
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#include "Exception.h"
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#include "IReader.h"
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AUD_NAMESPACE_BEGIN
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void SDLDevice::SDL_mix(void* userdata, SDL_AudioStream* stream, int additional_amount, int /*total_amount*/)
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{
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SDLDevice* device = (SDLDevice*)userdata;
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if(!device->m_playback)
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return;
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const int sample_size = AUD_DEVICE_SAMPLE_SIZE(device->m_specs);
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const int num_samples = additional_amount / sample_size;
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data_t* buffer = (data_t*)SDL_stack_alloc(Uint8, additional_amount);
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device->mix(buffer, num_samples);
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SDL_PutAudioStreamData(stream, buffer, additional_amount);
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SDL_stack_free(buffer);
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}
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void SDLDevice::playing(bool playing)
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{
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if(playing)
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SDL_ResumeAudioStreamDevice(m_stream);
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else
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SDL_PauseAudioStreamDevice(m_stream);
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m_playback = playing;
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}
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SDL_AudioSpec SDLDevice::sdl_audiospec_from_device_specs(const DeviceSpecs &specs)
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{
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SDL_AudioSpec audiospec;
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switch(specs.format)
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{
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case FORMAT_U8:
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audiospec.format = SDL_AUDIO_U8;
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break;
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case FORMAT_S16:
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audiospec.format = SDL_AUDIO_S16;
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break;
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case FORMAT_S32:
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audiospec.format = SDL_AUDIO_S32;
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break;
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case FORMAT_FLOAT32:
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audiospec.format = SDL_AUDIO_F32;
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break;
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default:
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audiospec.format = SDL_AUDIO_F32;
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break;
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}
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audiospec.channels = specs.channels;
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audiospec.freq = specs.rate;
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return audiospec;
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}
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SDLDevice::SDLDevice(DeviceSpecs specs, int buffersize) :
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m_playback(false),
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m_stream(nullptr)
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{
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if(specs.channels == CHANNELS_INVALID)
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specs.channels = CHANNELS_STEREO;
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if(specs.format == FORMAT_INVALID)
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specs.format = FORMAT_FLOAT32;
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if(specs.rate == static_cast<SampleRate>(RATE_INVALID))
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specs.rate = RATE_48000;
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m_specs = specs;
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if(!SDL_InitSubSystem(SDL_INIT_AUDIO))
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AUD_THROW(DeviceException, "Failed to initialize SDL Audio subsystem.");
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const SDL_AudioSpec audiospec = sdl_audiospec_from_device_specs(specs);
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m_stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &audiospec, SDLDevice::SDL_mix, this);
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if(!m_stream)
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AUD_THROW(DeviceException, "The audio device couldn't be opened with SDL.");
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create();
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}
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SDLDevice::~SDLDevice()
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{
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destroy();
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SDL_DestroyAudioStream(m_stream);
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SDL_QuitSubSystem(SDL_INIT_AUDIO);
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}
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class SDLDeviceFactory : public IDeviceFactory
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{
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private:
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DeviceSpecs m_specs;
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int m_buffersize;
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public:
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SDLDeviceFactory() :
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m_buffersize(AUD_DEFAULT_BUFFER_SIZE)
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{
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m_specs.format = FORMAT_S16;
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m_specs.channels = CHANNELS_STEREO;
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m_specs.rate = RATE_48000;
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}
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virtual std::shared_ptr<IDevice> openDevice()
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{
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return std::shared_ptr<IDevice>(new SDLDevice(m_specs, m_buffersize));
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}
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virtual int getPriority()
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{
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return 1 << 5;
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}
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virtual void setSpecs(DeviceSpecs specs)
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{
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m_specs = specs;
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}
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virtual void setBufferSize(int buffersize)
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{
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m_buffersize = buffersize;
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}
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virtual void setName(const std::string &name)
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{
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}
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};
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void SDLDevice::registerPlugin()
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{
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DeviceManager::registerDevice("SDL", std::shared_ptr<IDeviceFactory>(new SDLDeviceFactory));
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}
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#ifdef SDL_PLUGIN
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extern "C" AUD_PLUGIN_API void registerPlugin()
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{
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SDLDevice::registerPlugin();
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}
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extern "C" AUD_PLUGIN_API const char* getName()
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{
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return "SDL";
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}
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#endif
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AUD_NAMESPACE_END
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