e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 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 | |