1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/*
* Nestopia UE
*
* Copyright (C) 2012-2021 R. Danbrook
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*/
#include <cstdio>
#include <cstring>
#include "nstcommon.h"
#include "config.h"
#include "audio.h"
#define BUFSIZE 16000
extern Emulator emulator;
static SDL_AudioSpec spec, obtained;
static SDL_AudioDeviceID dev;
static SDL_AudioCVT cvt;
static int16_t intbuf[BUFSIZE];
static int16_t extbuf[BUFSIZE];
static uint16_t bufstart = 0;
static uint16_t bufend = 0;
static uint16_t bufsamples = 0;
static uint16_t framerate, channels, bufsize;
static bool paused = false;
void audio_set_speed(int speed) {
bufsize = (channels * (conf.audio_sample_rate / framerate)) / speed;
}
void audio_queue() {
while ((bufsamples + bufsize) >= BUFSIZE) { SDL_Delay(1); }
SDL_LockAudioDevice(dev);
int numsamples = bufsize;
if (bufsamples < bufsize * 3) {
SDL_ConvertAudio(&cvt);
numsamples += channels * 2;
}
for (int i = 0; i < numsamples; i++) {
extbuf[bufend] = intbuf[i];
bufend = (bufend + 1) % BUFSIZE;
bufsamples++;
if (bufsamples >= BUFSIZE - 1) { break; }
}
SDL_UnlockAudioDevice(dev);
}
static inline float audio_dequeue() {
if (bufsamples == 0) { return 0; }
int16_t sample = extbuf[bufstart];
bufstart = (bufstart + 1) % BUFSIZE;
bufsamples--;
return sample;
}
void audio_cb(void *data, uint8_t *stream, int len) {
int16_t *out = (int16_t*)stream;
for (int i = 0; i < len / sizeof(int16_t); i++) {
out[i] = audio_dequeue();
}
}
void audio_deinit() {
if (dev) { SDL_CloseAudioDevice(dev); }
}
void audio_init_sdl() {
int e = 1; // Check Endianness
SDL_AudioFormat fmt = ((int)*((unsigned char *)&e) == 1) ? AUDIO_S16LSB : AUDIO_S16MSB;
spec.freq = conf.audio_sample_rate;
spec.format = fmt;
spec.channels = channels;
spec.silence = 0;
spec.samples = 512;
spec.userdata = 0;
spec.callback = audio_cb;
bufsize = channels * (conf.audio_sample_rate / framerate);
bufend = bufstart = bufsamples = 0;
dev = SDL_OpenAudioDevice(NULL, 0, &spec, &obtained, SDL_AUDIO_ALLOW_ANY_CHANGE);
if (!dev) {
fprintf(stderr, "Error opening audio device.\n");
}
else {
fprintf(stderr, "Audio: SDL - %dHz, %d channel(s)\n", spec.freq, spec.channels);
}
SDL_BuildAudioCVT(&cvt, fmt, channels, conf.audio_sample_rate, fmt, channels, conf.audio_sample_rate + ((nst_pal() ? 50 : 60) * channels * 2));
SDL_assert(cvt.needed);
cvt.len = (bufsize + channels * 2) * sizeof(int16_t);
cvt.buf = (Uint8*)intbuf;
SDL_PauseAudioDevice(dev, 1); // Setting to 0 unpauses
}
void audio_init() {
// Initialize audio device
// Set the framerate based on the region. For PAL: (60 / 6) * 5 = 50
framerate = nst_pal() ? (conf.timing_speed / 6) * 5 : conf.timing_speed;
channels = conf.audio_stereo ? 2 : 1;
memset(intbuf, 0, sizeof(int16_t) * BUFSIZE);
audio_init_sdl();
paused = false;
}
void audio_pause() {
// Pause the SDL audio device
SDL_PauseAudioDevice(dev, 1);
paused = true;
}
void audio_unpause() {
// Unpause the SDL audio device
SDL_PauseAudioDevice(dev, 0);
paused = false;
}
void audio_set_params(Sound::Output *soundoutput) {
// Set audio parameters
Sound sound(emulator);
sound.SetSampleRate(conf.audio_sample_rate);
sound.SetSpeaker(conf.audio_stereo ? Sound::SPEAKER_STEREO : Sound::SPEAKER_MONO);
sound.SetSpeed(Sound::DEFAULT_SPEED);
audio_adj_volume();
soundoutput->samples[0] = intbuf;
soundoutput->length[0] = conf.audio_sample_rate / framerate;
soundoutput->samples[1] = NULL;
soundoutput->length[1] = 0;
}
void audio_adj_volume() {
// Adjust the audio volume to the current settings
Sound sound(emulator);
sound.SetVolume(Sound::ALL_CHANNELS, conf.audio_volume);
sound.SetVolume(Sound::CHANNEL_SQUARE1, conf.audio_vol_sq1);
sound.SetVolume(Sound::CHANNEL_SQUARE2, conf.audio_vol_sq2);
sound.SetVolume(Sound::CHANNEL_TRIANGLE, conf.audio_vol_tri);
sound.SetVolume(Sound::CHANNEL_NOISE, conf.audio_vol_noise);
sound.SetVolume(Sound::CHANNEL_DPCM, conf.audio_vol_dpcm);
sound.SetVolume(Sound::CHANNEL_FDS, conf.audio_vol_fds);
sound.SetVolume(Sound::CHANNEL_MMC5, conf.audio_vol_mmc5);
sound.SetVolume(Sound::CHANNEL_VRC6, conf.audio_vol_vrc6);
sound.SetVolume(Sound::CHANNEL_VRC7, conf.audio_vol_vrc7);
sound.SetVolume(Sound::CHANNEL_N163, conf.audio_vol_n163);
sound.SetVolume(Sound::CHANNEL_S5B, conf.audio_vol_s5b);
if (conf.audio_volume == 0) { memset(intbuf, 0, sizeof(int16_t) * BUFSIZE); }
}
|
