From 7056c83bbb7c444fbdb55ea4a51382f77d7faa36 Mon Sep 17 00:00:00 2001
From: NishiOwO <nishi@nishi.boats>
Date: Mon, 24 Mar 2025 17:41:04 +0900
Subject: [PATCH] Add working NetBSD sound support

---
 src/sound/audio4.c | 104 ++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 94 insertions(+), 10 deletions(-)

diff --git a/src/sound/audio4.c b/src/sound/audio4.c
index 3b3d4a429..e7b7dcf33 100644
--- a/src/sound/audio4.c
+++ b/src/sound/audio4.c
@@ -6,8 +6,8 @@
  *
  *           This file is part of the 86Box distribution.
  *
- *           Interface to audio(4).
- *
+ *           Interface to audio(4) for NetBSD/OpenBSD.
+ *           TODO: Test on OpenBSD
  *
  *
  * Authors:  Nishi
@@ -15,37 +15,121 @@
  *           Copyright 2025 Nishi.
  */
 #include <stdint.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
 
+#include <sys/audioio.h>
+#include <sys/param.h>
+
+#include <86box/86box.h>
 #include <86box/sound.h>
+#include <86box/plat_unused.h>
 
-#define FREQ   SOUND_FREQ
-#define BUFLEN SOUNDBUFLEN
+#define I_NORMAL 0
+#define I_MUSIC 1
+#define I_WT 2
+#define I_CD 3
+#define I_MIDI 4
 
-static int midi_freq = 44100;
-static int midi_buf_size = 4410;
+static int audio[5] = {-1, -1, -1, -1, -1};
+static audio_offset_t offset[5];
+static audio_info_t info[5];
+static int freqs[5] = {SOUND_FREQ, MUSIC_FREQ, WT_FREQ, CD_FREQ, 0};
 
 void closeal(void){
+	int i;
+	for(i = 0; i < sizeof(audio) / sizeof(audio[0]); i++){
+		if(audio[i] != -1){
+			close(audio[i]);
+		}
+		audio[i] = -1;
+	}
 }
 
 void inital(void){
+	int i;
+	for(i = 0; i < sizeof(audio) / sizeof(audio[0]); i++){
+		audio[i] = open("/dev/audio", O_WRONLY);
+		if(audio[i] != -1){
+			AUDIO_INITINFO(&info[i]);
+#if defined(__NetBSD__) && (__NetBSD_Version__ >= 900000000)
+			ioctl(audio[i], AUDIO_GETFORMAT, &info[i]);
+#else
+			ioctl(audio[i], AUDIO_GETINFO, &info[i]);
+#endif
+			info[i].play.channels = 2;
+			info[i].play.precision = 16;
+			info[i].play.encoding = AUDIO_ENCODING_SLINEAR;
+			info[i].hiwat = 5;
+			info[i].lowat = 3;
+			ioctl(audio[i], AUDIO_SETINFO, &info[i]);
+		}
+	}
+}
+
+void givealbuffer_common(const void *buf, const uint8_t src, const int size){
+	const int freq = freqs[src];
+	int16_t* output;
+	int output_size;
+	int16_t* conv;
+	int conv_size;
+	int i;
+        double gain;
+	if(audio[src] == -1) return;
+
+	gain = sound_muted ? 0.0 : pow(10.0, (double) sound_gain / 20.0);
+
+	if(sound_is_float){
+		float* input = (float*)buf;
+		conv_size = sizeof(int16_t) * size;
+		conv = malloc(conv_size);
+		for(i = 0; i < conv_size / sizeof(int16_t); i++){
+			conv[i] = 32767 * input[i];
+		}
+	}else{
+		conv_size = size * sizeof(int16_t);
+		conv = malloc(conv_size);
+		memcpy(conv, buf, conv_size);
+	}
+
+	output_size = (double)conv_size * info[src].play.sample_rate / freq;
+	output = malloc(output_size);
+	
+	for(i = 0; i < output_size / sizeof(int16_t) / 2; i++){
+		int ind = i * freq / info[src].play.sample_rate * 2;
+		output[i * 2 + 0] = conv[ind + 0] * gain;
+		output[i * 2 + 1] = conv[ind + 1] * gain;
+	}
+
+	write(audio[src], output, output_size);
+
+	free(conv);
+	free(output);
 }
 
 void givealbuffer(const void *buf){
+	givealbuffer_common(buf, I_NORMAL, SOUNDBUFLEN << 1);
 }
 
 void givealbuffer_music(const void *buf){
+	givealbuffer_common(buf, I_MUSIC, MUSICBUFLEN << 1);
 }
 
 void givealbuffer_wt(const void *buf){
+	givealbuffer_common(buf, I_WT, WTBUFLEN << 1);
 }
 
 void givealbuffer_cd(const void *buf){
+	givealbuffer_common(buf, I_CD, CD_BUFLEN << 1);
 }
-
 void givealbuffer_midi(const void *buf, const uint32_t size){
+	givealbuffer_common(buf, I_MIDI, (int) size);
 }
 	
-void al_set_midi(const int freq, const int buf_size){
-    midi_freq     = freq;
-    midi_buf_size = buf_size;
+void al_set_midi(const int freq, UNUSED(const int buf_size)){
+	freqs[I_MIDI] = freq;
 }