AUD_SDLDevice.cpp

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * Copyright 2009-2011 Jörg Hermann Müller
 *
 * This file is part of AudaSpace.
 *
 * Audaspace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * AudaSpace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Audaspace; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "AUD_SDLDevice.h"
#include "AUD_IReader.h"

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

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

static const char* open_error = "AUD_SDLDevice: Device couldn't be opened.";
static const char* format_error = "AUD_SDLDevice: Obtained unsupported sample "
                                  "format.";

AUD_SDLDevice::AUD_SDLDevice(AUD_DeviceSpecs specs, int buffersize)
{
    if(specs.channels == AUD_CHANNELS_INVALID)
        specs.channels = AUD_CHANNELS_STEREO;
    if(specs.format == AUD_FORMAT_INVALID)
        specs.format = AUD_FORMAT_S16;
    if(specs.rate == AUD_RATE_INVALID)
        specs.rate = AUD_RATE_44100;

    m_specs = specs;

    SDL_AudioSpec format, obtained;

    format.freq = m_specs.rate;
    if(m_specs.format == AUD_FORMAT_U8)
        format.format = AUDIO_U8;
    else
        format.format = AUDIO_S16SYS;
    format.channels = m_specs.channels;
    format.samples = buffersize;
    format.callback = AUD_SDLDevice::SDL_mix;
    format.userdata = this;

    if(SDL_OpenAudio(&format, &obtained) != 0)
        AUD_THROW(AUD_ERROR_SDL, open_error);

    m_specs.rate = (AUD_SampleRate)obtained.freq;
    m_specs.channels = (AUD_Channels)obtained.channels;
    if(obtained.format == AUDIO_U8)
        m_specs.format = AUD_FORMAT_U8;
    else if(obtained.format == AUDIO_S16LSB || obtained.format == AUDIO_S16MSB)
        m_specs.format = AUD_FORMAT_S16;
    else
    {
        SDL_CloseAudio();
        AUD_THROW(AUD_ERROR_SDL, format_error);
    }

    create();
}

AUD_SDLDevice::~AUD_SDLDevice()
{
    lock();
    SDL_CloseAudio();
    unlock();

    destroy();
}

void AUD_SDLDevice::playing(bool playing)
{
    SDL_PauseAudio(playing ? 0 : 1);
}