|
1 /* |
|
2 SDL - Simple DirectMedia Layer |
|
3 Copyright (C) 1997-2006 Sam Lantinga |
|
4 |
|
5 This library is free software; you can redistribute it and/or |
|
6 modify it under the terms of the GNU Lesser General Public |
|
7 License as published by the Free Software Foundation; either |
|
8 version 2.1 of the License, or (at your option) any later version. |
|
9 |
|
10 This library is distributed in the hope that it will be useful, |
|
11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
13 Lesser General Public License for more details. |
|
14 |
|
15 You should have received a copy of the GNU Lesser General Public |
|
16 License along with this library; if not, write to the Free Software |
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
|
18 |
|
19 Sam Lantinga |
|
20 slouken@libsdl.org |
|
21 */ |
|
22 #include "SDL_config.h" |
|
23 |
|
24 /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */ |
|
25 /* patch for IRIX 5 by Georg Schwarz 18/07/2004 */ |
|
26 |
|
27 #include "SDL_timer.h" |
|
28 #include "SDL_audio.h" |
|
29 #include "../SDL_audiomem.h" |
|
30 #include "../SDL_audio_c.h" |
|
31 #include "SDL_irixaudio.h" |
|
32 |
|
33 |
|
34 #ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */ |
|
35 #define OLD_IRIX_AUDIO |
|
36 #define alClosePort(x) ALcloseport(x) |
|
37 #define alFreeConfig(x) ALfreeconfig(x) |
|
38 #define alGetFillable(x) ALgetfillable(x) |
|
39 #define alNewConfig() ALnewconfig() |
|
40 #define alOpenPort(x,y,z) ALopenport(x,y,z) |
|
41 #define alSetChannels(x,y) ALsetchannels(x,y) |
|
42 #define alSetQueueSize(x,y) ALsetqueuesize(x,y) |
|
43 #define alSetSampFmt(x,y) ALsetsampfmt(x,y) |
|
44 #define alSetWidth(x,y) ALsetwidth(x,y) |
|
45 #endif |
|
46 |
|
47 /* Audio driver functions */ |
|
48 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec); |
|
49 static void AL_WaitAudio(_THIS); |
|
50 static void AL_PlayAudio(_THIS); |
|
51 static Uint8 *AL_GetAudioBuf(_THIS); |
|
52 static void AL_CloseAudio(_THIS); |
|
53 |
|
54 /* Audio driver bootstrap functions */ |
|
55 |
|
56 static int Audio_Available(void) |
|
57 { |
|
58 return 1; |
|
59 } |
|
60 |
|
61 static void Audio_DeleteDevice(SDL_AudioDevice *device) |
|
62 { |
|
63 SDL_free(device->hidden); |
|
64 SDL_free(device); |
|
65 } |
|
66 |
|
67 static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
|
68 { |
|
69 SDL_AudioDevice *this; |
|
70 |
|
71 /* Initialize all variables that we clean on shutdown */ |
|
72 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
|
73 if ( this ) { |
|
74 SDL_memset(this, 0, (sizeof *this)); |
|
75 this->hidden = (struct SDL_PrivateAudioData *) |
|
76 SDL_malloc((sizeof *this->hidden)); |
|
77 } |
|
78 if ( (this == NULL) || (this->hidden == NULL) ) { |
|
79 SDL_OutOfMemory(); |
|
80 if ( this ) { |
|
81 SDL_free(this); |
|
82 } |
|
83 return(0); |
|
84 } |
|
85 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
|
86 |
|
87 /* Set the function pointers */ |
|
88 this->OpenAudio = AL_OpenAudio; |
|
89 this->WaitAudio = AL_WaitAudio; |
|
90 this->PlayAudio = AL_PlayAudio; |
|
91 this->GetAudioBuf = AL_GetAudioBuf; |
|
92 this->CloseAudio = AL_CloseAudio; |
|
93 |
|
94 this->free = Audio_DeleteDevice; |
|
95 |
|
96 return this; |
|
97 } |
|
98 |
|
99 AudioBootStrap DMEDIA_bootstrap = { |
|
100 "AL", "IRIX DMedia audio", |
|
101 Audio_Available, Audio_CreateDevice |
|
102 }; |
|
103 |
|
104 |
|
105 void static AL_WaitAudio(_THIS) |
|
106 { |
|
107 Sint32 timeleft; |
|
108 |
|
109 timeleft = this->spec.samples - alGetFillable(audio_port); |
|
110 if ( timeleft > 0 ) { |
|
111 timeleft /= (this->spec.freq/1000); |
|
112 SDL_Delay((Uint32)timeleft); |
|
113 } |
|
114 } |
|
115 |
|
116 static void AL_PlayAudio(_THIS) |
|
117 { |
|
118 /* Write the audio data out */ |
|
119 if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) { |
|
120 /* Assume fatal error, for now */ |
|
121 this->enabled = 0; |
|
122 } |
|
123 } |
|
124 |
|
125 static Uint8 *AL_GetAudioBuf(_THIS) |
|
126 { |
|
127 return(mixbuf); |
|
128 } |
|
129 |
|
130 static void AL_CloseAudio(_THIS) |
|
131 { |
|
132 if ( mixbuf != NULL ) { |
|
133 SDL_FreeAudioMem(mixbuf); |
|
134 mixbuf = NULL; |
|
135 } |
|
136 if ( audio_port != NULL ) { |
|
137 alClosePort(audio_port); |
|
138 audio_port = NULL; |
|
139 } |
|
140 } |
|
141 |
|
142 static int AL_OpenAudio(_THIS, SDL_AudioSpec * spec) |
|
143 { |
|
144 Uint16 test_format = SDL_FirstAudioFormat(spec->format); |
|
145 long width = 0; |
|
146 long fmt = 0; |
|
147 int valid = 0; |
|
148 |
|
149 #ifdef OLD_IRIX_AUDIO |
|
150 { |
|
151 long audio_param[2]; |
|
152 audio_param[0] = AL_OUTPUT_RATE; |
|
153 audio_param[1] = spec->freq; |
|
154 valid = (ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0); |
|
155 } |
|
156 #else |
|
157 { |
|
158 ALpv audio_param; |
|
159 audio_param.param = AL_RATE; |
|
160 audio_param.value.i = spec->freq; |
|
161 valid = (alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0); |
|
162 } |
|
163 #endif |
|
164 |
|
165 while ((!valid) && (test_format)) { |
|
166 valid = 1; |
|
167 spec->format = test_format; |
|
168 |
|
169 switch (test_format) { |
|
170 case AUDIO_S8: |
|
171 width = AL_SAMPLE_8; |
|
172 fmt = AL_SAMPFMT_TWOSCOMP; |
|
173 break; |
|
174 |
|
175 case AUDIO_S16SYS: |
|
176 width = AL_SAMPLE_16; |
|
177 fmt = AL_SAMPFMT_TWOSCOMP; |
|
178 break; |
|
179 |
|
180 default: |
|
181 valid = 0; |
|
182 test_format = SDL_NextAudioFormat(); |
|
183 break; |
|
184 } |
|
185 |
|
186 if (valid) { |
|
187 ALconfig audio_config = alNewConfig(); |
|
188 valid = 0; |
|
189 if (audio_config) { |
|
190 if (alSetChannels(audio_config, spec->channels) < 0) { |
|
191 if (spec->channels > 2) { /* can't handle > stereo? */ |
|
192 spec->channels = 2; /* try again below. */ |
|
193 } |
|
194 } |
|
195 |
|
196 if ((alSetSampFmt(audio_config, fmt) >= 0) && |
|
197 ((!width) || (alSetWidth(audio_config, width) >= 0)) && |
|
198 (alSetQueueSize(audio_config, spec->samples * 2) >= 0) && |
|
199 (alSetChannels(audio_config, spec->channels) >= 0)) { |
|
200 |
|
201 audio_port = alOpenPort("SDL audio", "w", audio_config); |
|
202 if (audio_port == NULL) { |
|
203 /* docs say AL_BAD_CHANNELS happens here, too. */ |
|
204 int err = oserror(); |
|
205 if (err == AL_BAD_CHANNELS) { |
|
206 spec->channels = 2; |
|
207 alSetChannels(audio_config, spec->channels); |
|
208 audio_port = alOpenPort("SDL audio", "w", |
|
209 audio_config); |
|
210 } |
|
211 } |
|
212 |
|
213 if (audio_port != NULL) { |
|
214 valid = 1; |
|
215 } |
|
216 } |
|
217 |
|
218 alFreeConfig(audio_config); |
|
219 } |
|
220 } |
|
221 } |
|
222 |
|
223 if (!valid) { |
|
224 SDL_SetError("Unsupported audio format"); |
|
225 return (-1); |
|
226 } |
|
227 |
|
228 /* Update the fragment size as size in bytes */ |
|
229 SDL_CalculateAudioSpec(spec); |
|
230 |
|
231 /* Allocate mixing buffer */ |
|
232 mixbuf = (Uint8 *) SDL_AllocAudioMem(spec->size); |
|
233 if (mixbuf == NULL) { |
|
234 SDL_OutOfMemory(); |
|
235 return (-1); |
|
236 } |
|
237 SDL_memset(mixbuf, spec->silence, spec->size); |
|
238 |
|
239 /* We're ready to rock and roll. :-) */ |
|
240 return (0); |
|
241 } |
|
242 |