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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
;;
;; Komposter player (c) 2010 Noora Halme et al. (see AUTHORS)
;;
;; This code is licensed under the MIT license:
;; http://www.opensource.org/licenses/mit-license.php
;;
;; Here is the actual main program which renders the song, creates a
;; playback device and starts audio playback.
;;
;; This example code uses MacOS X ABI and OpenAL but adapting to other x86
;; systems should be trivial.
;;
;;
; write rendered audio to file?
;%define WRITE_TO_FILE 1
; the frequency used to play the sample data
%define OUTPUTFREQ 44100
; length of the data buffer - must be the same as in in player.asm
%define SONG_BUFFERLEN 15*OUTPUTFREQ
; openal constants
%define AL_FORMAT_MONO16 0x1101
%define AL_BUFFER 0x1009
%define AL_GAIN 0x100A
extern _printf
extern _alutInit
extern _alGenSources
extern _alGenBuffers
extern _alBufferData
extern _alSourcei
extern _alSourcef
extern _alSourcePlay
extern _alcASASetListener
extern _alcASASetSource
; these are from player.asm
extern render_song
extern songbuffer
;
; DATA
;
section .data
initing db "rendering audio...",10,0
playing db "playing..",10,0
reverb dd 1
reverbsend dd __float32__(0.1)
reverbtype dd 12
%ifdef WRITE_TO_FILE
extern _fopen
extern _fwrite
extern _fclose
writing db 10,"writing to file...",10,0
fname db "playerout.raw",0
fmode db "w",0
%endif
;
; BSS
;
section .bss
dev resd 1 ;*ALCdevice
con resd 1 ;*ALCcontext
buffer resd 1
source resd 1
ppos resd 1
fpos resd 1
fhandle resd 1
;
; TEXT
;
section .text
global _start
_main:
_start:
; pad stack to a 16 byte boundary. this is required
; by os x abi and not doing it will make things break
; spectacularly
.stackpad:
mov eax, esp
and eax, 0x0000000f
jz .stackok
push byte 0
jmp .stackpad
.stackok:
; print the rendering message
sub esp, 12
push initing
call _printf
add esp, 16
; fill buffer
call render_song
; write message
%ifdef WRITE_TO_FILE
sub esp, 12
push writing
call _printf
add esp, 16
; write to file
sub esp, 8
push fmode
push fname
call _fopen
add esp, 16
mov [fhandle], eax
push eax
push dword SONG_BUFFERLEN
push dword 2
push songbuffer
call _fwrite
add esp, 16
sub esp, 12
push dword [fhandle]
call _fclose
add esp, 16
ret
%endif
; alutInit();
call _alutInit
; alGenSources(1, &source);
sub esp, 8
push source
push dword 1
call _alGenSources
add esp, 16
; alGenBuffers(1, &buffer);
sub esp, 8
push buffer
push dword 1
call _alGenBuffers
add esp, 16
; alBufferData(buffer, AL_FORMAT_MONO16, buf, BUFFER_SIZE*2, 44100);
sub esp, 12
push dword OUTPUTFREQ
push dword SONG_BUFFERLEN*2
push songbuffer
push AL_FORMAT_MONO16
push dword [buffer]
call _alBufferData
add esp, 32
; alSourcei(source, AL_BUFFER, buffer);
sub esp, 4
push dword [buffer]
push dword AL_BUFFER
push dword [source]
call _alSourcei
add esp, 16
; add reverb?
%if 0
;alcASASetListener(const ALuint property, ALvoid *data, ALuint dataSize);
sub esp, 4
push dword 4
push reverb
push dword 'novr' ;'rvon'
call _alcASASetListener
add esp, 16
sub esp, 4
push dword 4
push reverbtype
push dword 'trvr'
call _alcASASetListener
add esp, 16
;alcASASetSource(const ALuint property, ALuint source, ALvoid *data, ALuint dataSize);
push dword 4
push reverbsend
push dword [source]
push dword 'lsvr' ;'rvsl'
call _alcASASetSource
add esp, 16
%endif
; alSourcePlay(source);
sub esp, 12
push dword [source]
call _alSourcePlay
add esp, 16
; print the playing message
sub esp, 12
push playing
call _printf
add esp, 16
; loop forever
.loopin:
jmp .loopin
;;
;; eof
;;
|
