111 lines
2.6 KiB
OpenEdge ABL
111 lines
2.6 KiB
OpenEdge ABL
/*
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* Copyright (c) 2010 Jacob Meuser <jakemsr@sdf.lonestar.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Based on SID_openbsd by Marc Espie. */
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extern "C" {
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#include "VIC.h"
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}
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#define FRAGSIZE (SAMPLE_FREQ / CALC_FREQ) /* samples in a fragment */
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void DigitalRenderer::init_sound(void)
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{
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struct sio_par par;
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ready = false;
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hdl = sio_open(NULL, SIO_PLAY, 0);
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if (hdl == NULL) {
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fprintf(stderr, "SID_sndio: unable to open device\n");
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return;
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}
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sio_initpar(&par);
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par.rate = SAMPLE_FREQ;
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par.pchan = 1;
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par.bits = 16;
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par.sig = 1;
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par.round = FRAGSIZE;
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par.appbufsz = FRAGSIZE * 2;
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if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par)) {
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fprintf(stderr, "SID_sndio: failure setting parameters.\n");
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sio_close(hdl);
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return;
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}
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if (par.rate != SAMPLE_FREQ || par.bits != 16 || par.sig != 1 ||
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par.pchan != 1) {
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fprintf(stderr, "SID_sndio: could not set desired parameters.\n");
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sio_close(hdl);
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return;
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} else {
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fprintf(stderr,
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"SID_sndio: selected 16 bits/%d hz linear encoding.\n",
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SAMPLE_FREQ);
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}
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if (!sio_start(hdl)) {
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fprintf(stderr, "SID_sndio: could not start sndio.\n");
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sio_close(hdl);
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return;
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}
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sound_calc_buf = new int16[FRAGSIZE];
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ready = true;
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}
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DigitalRenderer::~DigitalRenderer()
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{
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if (ready) {
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delete [] sound_calc_buf;
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if (hdl != NULL)
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sio_close(hdl);
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hdl = NULL;
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}
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}
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void DigitalRenderer::Pause(void)
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{
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}
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void DigitalRenderer::Resume(void)
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{
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}
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void DigitalRenderer::EmulateLine(void)
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{
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static int divisor = 0;
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static int to_output = 0;
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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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divisor += SAMPLE_FREQ;
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while (divisor >= 0) {
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divisor -= TOTAL_RASTERS * SCREEN_FREQ;
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to_output++;
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}
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if (!ready)
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return;
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while (to_output >= FRAGSIZE) {
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calc_buffer(sound_calc_buf, FRAGSIZE * 2);
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sio_write(hdl, sound_calc_buf, FRAGSIZE * 2);
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to_output -= FRAGSIZE;
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}
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}
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