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/*******************************************************************************
* 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
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