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cebix |
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/* |
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* SID_SDL.h - 6581 emulation, SDL specific stuff |
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* |
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* Frodo Copyright (C) Christian Bauer |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include <SDL/SDL_audio.h> |
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/* |
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* Initialization |
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*/ |
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void DigitalRenderer::init_sound(void) |
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{ |
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SDL_AudioSpec spec; |
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spec.freq = SAMPLE_FREQ; |
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spec.format = AUDIO_S16SYS; |
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spec.channels = 1; |
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spec.samples = 512; |
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spec.callback = buffer_proc; |
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spec.userdata = this; |
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if (SDL_OpenAudio(&spec, NULL) < 0) { |
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fprintf(stderr, "WARNING: Cannot open audio: %s\n", SDL_GetError()); |
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return; |
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} |
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SDL_PauseAudio(0); |
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ready = true; |
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} |
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/* |
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* Destructor |
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*/ |
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DigitalRenderer::~DigitalRenderer() |
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{ |
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SDL_CloseAudio(); |
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} |
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/* |
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* Sample volume (for sampled voice) |
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*/ |
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void DigitalRenderer::EmulateLine(void) |
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{ |
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sample_buf[sample_in_ptr] = volume; |
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sample_in_ptr = (sample_in_ptr + 1) % SAMPLE_BUF_SIZE; |
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} |
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/* |
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* Pause sound output |
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*/ |
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void DigitalRenderer::Pause(void) |
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{ |
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SDL_PauseAudio(1); |
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} |
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/* |
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* Resume sound output |
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*/ |
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void DigitalRenderer::Resume(void) |
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{ |
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SDL_PauseAudio(0); |
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} |
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/* |
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* Callback function |
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*/ |
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void DigitalRenderer::buffer_proc(void *cookie, uint8 *buffer, int size) |
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{ |
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DigitalRenderer * renderer = (DigitalRenderer *) cookie; |
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renderer->calc_buffer((int16 *) buffer, size); |
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} |
