/
fluidsynth.c
223 lines (184 loc) · 6.57 KB
1
/*
2
SDL_mixer: An audio mixer library based on the SDL library
3
Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
4
5
6
7
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
8
9
10
11
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
12
13
14
15
16
17
18
19
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
20
21
22
James Le Cuirot
chewi@aura-online.co.uk
23
24
*/
25
26
#ifdef USE_FLUIDSYNTH_MIDI
27
28
29
#include <stdio.h>
#include <sys/types.h>
30
31
32
#include "SDL_mixer.h"
#include "fluidsynth.h"
33
34
35
36
37
38
static Uint16 format;
static Uint8 channels;
static int freq;
int fluidsynth_check_soundfont(const char *path, void *data)
{
39
40
41
42
43
44
45
46
47
FILE *file = fopen(path, "r");
if (file) {
fclose(file);
return 1;
} else {
Mix_SetError("Failed to access the SoundFont %s", path);
return 0;
}
48
49
50
51
}
int fluidsynth_load_soundfont(const char *path, void *data)
{
52
53
54
/* If this fails, it's too late to try Timidity so pray that at least one works. */
fluidsynth.fluid_synth_sfload((fluid_synth_t*) data, path, 1);
return 1;
55
56
57
58
}
int fluidsynth_init(SDL_AudioSpec *mixer)
{
59
60
if (!Mix_EachSoundFont(fluidsynth_check_soundfont, NULL))
return -1;
61
62
63
64
format = mixer->format;
channels = mixer->channels;
freq = mixer->freq;
65
66
return 0;
67
68
}
69
static FluidSynthMidiSong *fluidsynth_loadsong_common(int (*function)(FluidSynthMidiSong*, void*), void *data)
70
{
71
72
73
74
75
76
77
78
FluidSynthMidiSong *song;
fluid_settings_t *settings = NULL;
if (!Mix_Init(MIX_INIT_FLUIDSYNTH)) {
return NULL;
}
if ((song = SDL_malloc(sizeof(FluidSynthMidiSong)))) {
79
SDL_memset(song, 0, sizeof(FluidSynthMidiSong));
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
if (SDL_BuildAudioCVT(&song->convert, AUDIO_S16, 2, freq, format, channels, freq) >= 0) {
if ((settings = fluidsynth.new_fluid_settings())) {
fluidsynth.fluid_settings_setnum(settings, "synth.sample-rate", (double) freq);
if ((song->synth = fluidsynth.new_fluid_synth(settings))) {
if (Mix_EachSoundFont(fluidsynth_load_soundfont, (void*) song->synth)) {
if ((song->player = fluidsynth.new_fluid_player(song->synth))) {
if (function(song, data)) return song;
fluidsynth.delete_fluid_player(song->player);
} else {
Mix_SetError("Failed to create FluidSynth player");
}
}
fluidsynth.delete_fluid_synth(song->synth);
} else {
Mix_SetError("Failed to create FluidSynth synthesizer");
}
fluidsynth.delete_fluid_settings(settings);
} else {
Mix_SetError("Failed to create FluidSynth settings");
}
} else {
Mix_SetError("Failed to set up audio conversion");
}
SDL_free(song);
} else {
Mix_SetError("Insufficient memory for song");
}
return NULL;
110
111
}
112
static int fluidsynth_loadsong_RW_internal(FluidSynthMidiSong *song, void *data)
113
{
114
Sint64 offset;
115
116
size_t size;
char *buffer;
117
SDL_RWops *src = (SDL_RWops*) data;
118
119
120
121
122
offset = SDL_RWtell(src);
SDL_RWseek(src, 0, RW_SEEK_END);
size = (size_t)(SDL_RWtell(src) - offset);
SDL_RWseek(src, offset, RW_SEEK_SET);
123
124
if ((buffer = (char*) SDL_malloc(size))) {
125
if(SDL_RWread(src, buffer, size, 1) == 1) {
126
if (fluidsynth.fluid_player_add_mem(song->player, buffer, size) == FLUID_OK) {
127
SDL_free(buffer);
128
129
130
131
132
133
134
135
136
137
138
139
return 1;
} else {
Mix_SetError("FluidSynth failed to load in-memory song");
}
} else {
Mix_SetError("Failed to read in-memory song");
}
SDL_free(buffer);
} else {
Mix_SetError("Insufficient memory for song");
}
return 0;
140
141
}
142
FluidSynthMidiSong *fluidsynth_loadsong_RW(SDL_RWops *src, int freesrc)
143
{
144
FluidSynthMidiSong *song;
145
146
147
148
song = fluidsynth_loadsong_common(fluidsynth_loadsong_RW_internal, (void*) src);
if (song && freesrc) {
SDL_RWclose(src);
149
150
}
return song;
151
152
153
154
}
void fluidsynth_freesong(FluidSynthMidiSong *song)
{
155
156
157
158
159
if (!song) return;
fluidsynth.delete_fluid_player(song->player);
fluidsynth.delete_fluid_settings(fluidsynth.fluid_synth_get_settings(song->synth));
fluidsynth.delete_fluid_synth(song->synth);
SDL_free(song);
160
161
162
163
}
void fluidsynth_start(FluidSynthMidiSong *song)
{
164
165
fluidsynth.fluid_player_set_loop(song->player, 1);
fluidsynth.fluid_player_play(song->player);
166
167
168
169
}
void fluidsynth_stop(FluidSynthMidiSong *song)
{
170
fluidsynth.fluid_player_stop(song->player);
171
172
173
174
}
int fluidsynth_active(FluidSynthMidiSong *song)
{
175
return fluidsynth.fluid_player_get_status(song->player) == FLUID_PLAYER_PLAYING ? 1 : 0;
176
177
178
179
}
void fluidsynth_setvolume(FluidSynthMidiSong *song, int volume)
{
180
181
/* FluidSynth's default is 0.2. Make 1.2 the maximum. */
fluidsynth.fluid_synth_set_gain(song->synth, (float) (volume * 1.2 / MIX_MAX_VOLUME));
182
183
184
185
}
int fluidsynth_playsome(FluidSynthMidiSong *song, void *dest, int dest_len)
{
186
187
188
189
int result = -1;
int frames = dest_len / channels / ((format & 0xFF) / 8);
int src_len = frames * 4; /* 16-bit stereo */
void *src = dest;
190
191
192
193
194
195
196
if (dest_len < src_len) {
if (!(src = SDL_malloc(src_len))) {
Mix_SetError("Insufficient memory for audio conversion");
return result;
}
}
197
198
199
200
201
if (fluidsynth.fluid_synth_write_s16(song->synth, frames, src, 0, 2, src, 1, 2) != FLUID_OK) {
Mix_SetError("Error generating FluidSynth audio");
goto finish;
}
202
203
204
song->convert.buf = src;
song->convert.len = src_len;
205
206
207
208
209
if (SDL_ConvertAudio(&song->convert) < 0) {
Mix_SetError("Error during audio conversion");
goto finish;
}
210
211
if (src != dest)
212
SDL_memcpy(dest, src, dest_len);
213
214
result = 0;
215
216
finish:
217
218
if (src != dest)
SDL_free(src);
219
220
return result;
221
}
222
223
#endif /* USE_FLUIDSYNTH_MIDI */