162 lines
3.7 KiB
C
162 lines
3.7 KiB
C
/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* Interface to audio(4) for NetBSD/OpenBSD.
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*
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*
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* Authors: Nishi
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*
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* Copyright 2025 Nishi.
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*/
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#include <stdint.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <sys/audioio.h>
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#include <sys/param.h>
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#include <86box/86box.h>
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#include <86box/sound.h>
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#include <86box/plat_unused.h>
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#if defined(OpenBSD) && OpenBSD >= 201709
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#define USE_NEW_API
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#endif
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#define I_NORMAL 0
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#define I_MUSIC 1
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#define I_WT 2
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#define I_CD 3
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#define I_MIDI 4
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static int audio[5] = {-1, -1, -1, -1, -1};
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#ifdef USE_NEW_API
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static struct audio_swpar info[5];
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#else
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static audio_info_t info[5];
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#endif
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static int freqs[5] = {SOUND_FREQ, MUSIC_FREQ, WT_FREQ, CD_FREQ, 0};
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void closeal(void){
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int i;
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for(i = 0; i < sizeof(audio) / sizeof(audio[0]); i++){
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if(audio[i] != -1){
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close(audio[i]);
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}
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audio[i] = -1;
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}
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}
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void inital(void){
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int i;
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for(i = 0; i < sizeof(audio) / sizeof(audio[0]); i++){
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audio[i] = open("/dev/audio", O_WRONLY);
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if(audio[i] == -1) audio[i] = open("/dev/audio0", O_WRONLY);
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if(audio[i] != -1){
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#ifdef USE_NEW_API
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AUDIO_INITPAR(&info[i]);
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ioctl(audio[i], AUDIO_GETPAR, &info[i]);
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info[i].sig = 1;
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info[i].bits = 16;
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info[i].pchan = 2;
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info[i].bps = 2;
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ioctl(audio[i], AUDIO_SETPAR, &info[i]);
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#else
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AUDIO_INITINFO(&info[i]);
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#if defined(__NetBSD__) && (__NetBSD_Version__ >= 900000000)
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ioctl(audio[i], AUDIO_GETFORMAT, &info[i]);
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#else
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ioctl(audio[i], AUDIO_GETINFO, &info[i]);
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#endif
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info[i].play.channels = 2;
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info[i].play.precision = 16;
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info[i].play.encoding = AUDIO_ENCODING_SLINEAR;
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info[i].hiwat = 5;
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info[i].lowat = 3;
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ioctl(audio[i], AUDIO_SETINFO, &info[i]);
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#endif
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}
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}
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}
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void givealbuffer_common(const void *buf, const uint8_t src, const int size){
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const int freq = freqs[src];
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int16_t* output;
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int output_size;
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int16_t* conv;
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int conv_size;
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int i;
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double gain;
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int target_rate;
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if(audio[src] == -1) return;
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gain = sound_muted ? 0.0 : pow(10.0, (double) sound_gain / 20.0);
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if(sound_is_float){
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float* input = (float*)buf;
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conv_size = sizeof(int16_t) * size;
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conv = malloc(conv_size);
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for(i = 0; i < conv_size / sizeof(int16_t); i++){
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conv[i] = 32767 * input[i];
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}
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}else{
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conv_size = size * sizeof(int16_t);
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conv = malloc(conv_size);
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memcpy(conv, buf, conv_size);
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}
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#ifdef USE_NEW_API
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target_rate = info[src].rate;
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#else
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target_rate = info[src].play.sample_rate;
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#endif
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output_size = (double)conv_size * target_rate / freq;
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output_size -= output_size % 4;
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output = malloc(output_size);
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for(i = 0; i < output_size / sizeof(int16_t) / 2; i++){
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int ind = i * freq / target_rate * 2;
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output[i * 2 + 0] = conv[ind + 0] * gain;
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output[i * 2 + 1] = conv[ind + 1] * gain;
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}
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write(audio[src], output, output_size);
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free(conv);
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free(output);
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}
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void givealbuffer(const void *buf){
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givealbuffer_common(buf, I_NORMAL, SOUNDBUFLEN << 1);
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}
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void givealbuffer_music(const void *buf){
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givealbuffer_common(buf, I_MUSIC, MUSICBUFLEN << 1);
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}
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void givealbuffer_wt(const void *buf){
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givealbuffer_common(buf, I_WT, WTBUFLEN << 1);
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}
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void givealbuffer_cd(const void *buf){
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givealbuffer_common(buf, I_CD, CD_BUFLEN << 1);
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}
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void givealbuffer_midi(const void *buf, const uint32_t size){
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givealbuffer_common(buf, I_MIDI, (int) size);
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}
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void al_set_midi(const int freq, UNUSED(const int buf_size)){
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freqs[I_MIDI] = freq;
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}
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