mirror of
https://github.com/Oibaf66/frodo-wii.git
synced 2024-11-29 15:04:23 +01:00
154 lines
3.0 KiB
OpenEdge ABL
154 lines
3.0 KiB
OpenEdge ABL
/*
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* SID_sun.i - 6581 emulation, SUN specific stuff
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*
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* Marc Chabanas
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*
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* The SID emulation will slow down the entire emulator to 100% after
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* it is selected. It is not compatible with the SID filters so these
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* have to be disabled if you don't want to see the performance becoming
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* as low as 20%.
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*/
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extern "C" {
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#include <sys/audioio.h>
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#include <unistd.h>
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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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#define MAXBUFFERED (3*FRAGSIZE) // allow ourself a little buffering
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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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struct audio_info info;
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ready = false;
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if ((fd = open("/dev/audio", O_WRONLY|O_NDELAY, 0)) < 0)
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{
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fprintf(stderr, "SID_sun : unable to open /dev/audio.\n");
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return;
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}
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AUDIO_INITINFO(&info);
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info.play.sample_rate = SAMPLE_FREQ;
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info.play.channels = 1;
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info.play.precision = 16;
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info.play.encoding = AUDIO_ENCODING_LINEAR;
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info.play.port = AUDIO_SPEAKER;
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if (ioctl(fd, AUDIO_SETINFO, &info))
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{
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fprintf(stderr,
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"SID_sun : unable to select 16 bits/%d khz linear encoding.\n",
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SAMPLE_FREQ);
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return;
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}
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else
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{
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fprintf(stderr,"SID_sun : selecting 16 bits/%d khz linear encoding.\n",
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SAMPLE_FREQ);
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}
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sound_calc_buf = new int16[FRAGSIZE];
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sent_samples = 0;
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delta_samples = 0;
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ready = true;
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return;
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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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fprintf(stderr,"SID_sun : leaving audio mode.\n");
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if (fd > 0)
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{
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if (ready)
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ioctl(fd, AUDIO_DRAIN);
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close(fd);
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}
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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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}
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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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}
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/*
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* Fill buffer, 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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static int divisor = 0;
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static int to_output = 0;
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static unsigned int sleeping;
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int ret;
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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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* Now see how many samples have to be added for this line
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*/
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divisor += SAMPLE_FREQ;
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while (divisor >= 0)
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divisor -= TOTAL_RASTERS*SCREEN_FREQ, to_output++;
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if (to_output >= FRAGSIZE) /* got enough to send */
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{
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calc_buffer(sound_calc_buf, FRAGSIZE*2);
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ret = write (fd,sound_calc_buf, FRAGSIZE*2);
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if (ret != FRAGSIZE*2) /* should not happen */
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{
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fprintf(stderr,"SID_sun : write to audio device failed. Exit.\n");
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exit(-1);
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}
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sent_samples+=FRAGSIZE;
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to_output=0;
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if (ioctl(fd, AUDIO_GETINFO, &status))
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{
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fprintf(stderr,"SID_sun : get audio status failed. Exit.\n");
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exit(-1);
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}
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while ((delta_samples = (sent_samples - status.play.samples)) > MAXBUFFERED)
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{
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sleeping = ((1000000*(delta_samples-MAXBUFFERED))/SAMPLE_FREQ);
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usleep(sleeping);
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if (ioctl(fd, AUDIO_GETINFO, &status))
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{
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fprintf(stderr,"SID_sun : get audio status failed. Exit.\n");
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exit(-1);
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}
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}
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}
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}
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