Differential D2716 Diff 9122 extern/audaspace/plugins/sdl/SDLDevice.cpp

Changeset View

Standalone View

extern/audaspace/plugins/sdl/SDLDevice.cpp

This file was added.

				/*******************************************************************************
				* Copyright 2009-2016 Jörg Müller
				*
				* Licensed under the Apache License, Version 2.0 (the "License");
				* you may not use this file except in compliance with the License.
				* You may obtain a copy of the License at
				*
				* http://www.apache.org/licenses/LICENSE-2.0
				*
				* Unless required by applicable law or agreed to in writing, software
				* distributed under the License is distributed on an "AS IS" BASIS,
				* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
				* See the License for the specific language governing permissions and
				* limitations under the License.
				******************************************************************************/

				#include "SDLDevice.h"
				#include "devices/DeviceManager.h"
				#include "devices/IDeviceFactory.h"
				#include "Exception.h"
				#include "IReader.h"

				AUD_NAMESPACE_BEGIN

				void SDLDevice::SDL_mix(void* data, Uint8* buffer, int length)
				{
				SDLDevice* device = (SDLDevice*)data;

				if(!device->m_playback)
				{
				SDL_PauseAudio(1);

				std::memset(buffer, 0, length);

				return;
				}

				device->mix((data_t*)buffer, length / AUD_DEVICE_SAMPLE_SIZE(device->m_specs));
				}

				void SDLDevice::playing(bool playing)
				{
				if(!m_playback)
				SDL_PauseAudio(playing ? 0 : 1);

				m_playback = playing;
				}

				SDLDevice::SDLDevice(DeviceSpecs specs, int buffersize) :
				m_playback(false)
				{
				if(specs.channels == CHANNELS_INVALID)
				specs.channels = CHANNELS_STEREO;
				if(specs.format == FORMAT_INVALID)
				specs.format = FORMAT_S16;
				if(specs.rate == RATE_INVALID)
				specs.rate = RATE_48000;

				m_specs = specs;

				SDL_AudioSpec format, obtained;

				format.freq = m_specs.rate;
				if(m_specs.format == FORMAT_U8)
				format.format = AUDIO_U8;
				else
				format.format = AUDIO_S16SYS;
				format.channels = m_specs.channels;
				format.samples = buffersize;
				format.callback = SDLDevice::SDL_mix;
				format.userdata = this;

				if(SDL_OpenAudio(&format, &obtained) != 0)
				AUD_THROW(DeviceException, "The audio device couldn't be opened with SDL.");

				m_specs.rate = (SampleRate)obtained.freq;
				m_specs.channels = (Channels)obtained.channels;
				if(obtained.format == AUDIO_U8)
				m_specs.format = FORMAT_U8;
				else if(obtained.format == AUDIO_S16LSB \|\| obtained.format == AUDIO_S16MSB)
				m_specs.format = FORMAT_S16;
				else
				{
				SDL_CloseAudio();
				AUD_THROW(DeviceException, "The sample format obtained from SDL is not supported.");
				}

				create();
				}

				SDLDevice::~SDLDevice()
				{
				SDL_PauseAudio(1);
				SDL_CloseAudio();

				destroy();
				}

				class SDLDeviceFactory : public IDeviceFactory
				{
				private:
				DeviceSpecs m_specs;
				int m_buffersize;

				public:
				SDLDeviceFactory() :
				m_buffersize(AUD_DEFAULT_BUFFER_SIZE)
				{
				m_specs.format = FORMAT_S16;
				m_specs.channels = CHANNELS_STEREO;
				m_specs.rate = RATE_48000;
				}

				virtual std::shared_ptr<IDevice> openDevice()
				{
				return std::shared_ptr<IDevice>(new SDLDevice(m_specs, m_buffersize));
				}

				virtual int getPriority()
				{
				return 1 << 5;
				}

				virtual void setSpecs(DeviceSpecs specs)
				{
				m_specs = specs;
				}

				virtual void setBufferSize(int buffersize)
				{
				m_buffersize = buffersize;
				}

				virtual void setName(std::string name)
				{
				}
				};

				void SDLDevice::registerPlugin()
				{
				DeviceManager::registerDevice("SDL", std::shared_ptr<IDeviceFactory>(new SDLDeviceFactory));
				}

				#ifdef SDL_PLUGIN
				extern "C" AUD_PLUGIN_API void registerPlugin()
				{
				SDLDevice::registerPlugin();
				}

				extern "C" AUD_PLUGIN_API const char* getName()
				{
				return "SDL";
				}
				#endif

				AUD_NAMESPACE_END