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ef79bbde P |
1 | /* SDL Driver for P.E.Op.S Sound Plugin |
2 | * Copyright (c) 2010, Wei Mingzhi <whistler_wmz@users.sf.net>. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA | |
17 | */ | |
18 | ||
19 | #include "stdafx.h" | |
20 | ||
21 | #include "externals.h" | |
22 | #include <SDL.h> | |
23 | ||
24 | #define BUFFER_SIZE 22050 | |
25 | ||
26 | short *pSndBuffer = NULL; | |
27 | int iBufSize = 0; | |
28 | volatile int iReadPos = 0, iWritePos = 0; | |
29 | ||
30 | static void SOUND_FillAudio(void *unused, Uint8 *stream, int len) { | |
31 | short *p = (short *)stream; | |
32 | ||
33 | len /= sizeof(short); | |
34 | ||
35 | while (iReadPos != iWritePos && len > 0) { | |
36 | *p++ = pSndBuffer[iReadPos++]; | |
37 | if (iReadPos >= iBufSize) iReadPos = 0; | |
38 | --len; | |
39 | } | |
40 | ||
41 | // Fill remaining space with zero | |
42 | while (len > 0) { | |
43 | *p++ = 0; | |
44 | --len; | |
45 | } | |
46 | } | |
47 | ||
48 | static void InitSDL() { | |
49 | if (SDL_WasInit(SDL_INIT_EVERYTHING)) { | |
50 | SDL_InitSubSystem(SDL_INIT_AUDIO); | |
51 | } else { | |
52 | SDL_Init(SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE); | |
53 | } | |
54 | } | |
55 | ||
56 | static void DestroySDL() { | |
57 | if (SDL_WasInit(SDL_INIT_EVERYTHING & ~SDL_INIT_AUDIO)) { | |
58 | SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
59 | } else { | |
60 | SDL_Quit(); | |
61 | } | |
62 | } | |
63 | ||
64 | void SetupSound(void) { | |
65 | SDL_AudioSpec spec; | |
66 | ||
67 | if (pSndBuffer != NULL) return; | |
68 | ||
69 | InitSDL(); | |
70 | ||
71 | spec.freq = 44100; | |
72 | spec.format = AUDIO_S16SYS; | |
97ea4077 | 73 | spec.channels = 2; |
ef79bbde P |
74 | spec.samples = 512; |
75 | spec.callback = SOUND_FillAudio; | |
76 | ||
77 | if (SDL_OpenAudio(&spec, NULL) < 0) { | |
78 | DestroySDL(); | |
79 | return; | |
80 | } | |
81 | ||
82 | iBufSize = BUFFER_SIZE; | |
ef79bbde P |
83 | |
84 | pSndBuffer = (short *)malloc(iBufSize * sizeof(short)); | |
85 | if (pSndBuffer == NULL) { | |
86 | SDL_CloseAudio(); | |
87 | return; | |
88 | } | |
89 | ||
90 | iReadPos = 0; | |
91 | iWritePos = 0; | |
92 | ||
93 | SDL_PauseAudio(0); | |
94 | } | |
95 | ||
96 | void RemoveSound(void) { | |
97 | if (pSndBuffer == NULL) return; | |
98 | ||
99 | SDL_CloseAudio(); | |
100 | DestroySDL(); | |
101 | ||
102 | free(pSndBuffer); | |
103 | pSndBuffer = NULL; | |
104 | } | |
105 | ||
106 | unsigned long SoundGetBytesBuffered(void) { | |
107 | int size; | |
108 | ||
109 | if (pSndBuffer == NULL) return SOUNDSIZE; | |
110 | ||
111 | size = iReadPos - iWritePos; | |
112 | if (size <= 0) size += iBufSize; | |
113 | ||
114 | if (size < iBufSize / 2) return SOUNDSIZE; | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | void SoundFeedStreamData(unsigned char *pSound, long lBytes) { | |
120 | short *p = (short *)pSound; | |
121 | ||
122 | if (pSndBuffer == NULL) return; | |
123 | ||
124 | while (lBytes > 0) { | |
125 | if (((iWritePos + 1) % iBufSize) == iReadPos) break; | |
126 | ||
127 | pSndBuffer[iWritePos] = *p++; | |
128 | ||
129 | ++iWritePos; | |
130 | if (iWritePos >= iBufSize) iWritePos = 0; | |
131 | ||
132 | lBytes -= sizeof(short); | |
133 | } | |
134 | } |