Mercurial > sdl-ios-xcode

comparison src/audio/dmedia/SDL_irixaudio.c @ 2002:7590aaf89a60

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Cleaned up IRIX audio driver, added float32 support and fallbacks when a specific audiospec isn't supported or the hardware fails. Usual disclaimer: No IRIX box, so this may not even compile.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 01 Sep 2006 00:04:07 +0000
parents c121d94672cb
children adf732f1f016
comparison
equal deleted inserted replaced
2001:02108bfd6550 2002:7590aaf89a60
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 18
19 Sam Lantinga 19 Sam Lantinga
20 slouken@libsdl.org 20 slouken@libsdl.org
21 */ 21 */
22 #include <errno.h>
22 #include "SDL_config.h" 23 #include "SDL_config.h"
23 24
24 /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */ 25 /* 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 /* patch for IRIX 5 by Georg Schwarz 18/07/2004 */
26 27
147 } 148 }
148 149
149 static int 150 static int
150 AL_OpenAudio(_THIS, SDL_AudioSpec * spec) 151 AL_OpenAudio(_THIS, SDL_AudioSpec * spec)
151 { 152 {
152 ALconfig audio_config; 153 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
154 long width = 0;
155 long fmt = 0;
156 int valid = 0;
157
153 #ifdef OLD_IRIX_AUDIO 158 #ifdef OLD_IRIX_AUDIO
154 long audio_param[2]; 159 {
160 long audio_param[2];
161 audio_param[0] = AL_OUTPUT_RATE;
162 audio_param[1] = spec->freq;
163 valid = (ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0);
164 }
155 #else 165 #else
156 ALpv audio_param; 166 {
167 ALpv audio_param;
168 audio_param.param = AL_RATE;
169 audio_param.value.i = spec->freq;
170 valid = (alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0);
171 }
157 #endif 172 #endif
158 int width; 173
159 174 while ((!valid) && (test_format)) {
160 /* Determine the audio parameters from the AudioSpec */ 175 valid = 1;
161 switch (spec->format & 0xFF) { 176 spec->format = test_format;
162 177
163 case 8: 178 switch (test_format) {
164 { /* Signed 8 bit audio data */ 179 case AUDIO_S8:
165 spec->format = AUDIO_S8; 180 width = AL_SAMPLE_8;
166 width = AL_SAMPLE_8; 181 fmt = AL_SAMPFMT_TWOSCOMP;
182 break;
183
184 case AUDIO_S16SYS:
185 width = AL_SAMPLE_16;
186 fmt = AL_SAMPFMT_TWOSCOMP;
187 break;
188
189 case AUDIO_F32SYS:
190 width = 0; /* not used here... */
191 fmt = AL_SAMPFMT_FLOAT;
192 break;
193
194 /* Docs say there is int24, but not int32.... */
195
196 default:
197 valid = 0;
198 test_format = SDL_NextAudioFormat();
199 break;
167 } 200 }
168 break; 201
169 202 if (valid) {
170 case 16: 203 ALconfig audio_config = alNewConfig();
171 { /* Signed 16 bit audio data */ 204 valid = 0;
172 spec->format = AUDIO_S16MSB; 205 if (audio_config) {
173 width = AL_SAMPLE_16; 206 if (alSetChannels(audio_config, spec->channels) < 0) {
207 if (spec->channels > 2) { /* can't handle > stereo? */
208 spec->channels = 2; /* try again below. */
209 }
210 }
211
212 if ((alSetSampFmt(audio_config, fmt) >= 0) &&
213 ((!width) || (alSetWidth(audio_config, width) >= 0)) &&
214 (alSetQueueSize(audio_config, spec->samples * 2) >= 0) &&
215 (alSetChannels(audio_config, spec->channels) >= 0)) {
216
217 audio_port = alOpenPort("SDL audio", "w", audio_config);
218 if (audio_port == NULL) {
219 /* docs say AL_BAD_CHANNELS happens here, too. */
220 int err = oserror();
221 if (err == AL_BAD_CHANNELS) {
222 spec->channels = 2;
223 alSetChannels(audio_config, spec->channels);
224 audio_port = alOpenPort("SDL audio", "w",
225 audio_config);
226 }
227 }
228
229 if (audio_port != NULL) {
230 valid = 1;
231 }
232 }
233
234 alFreeConfig(audio_config);
235 }
174 } 236 }
175 break; 237 }
176 238
177 default: 239 if (!valid) {
178 { 240 SDL_SetError("Unsupported audio format");
179 SDL_SetError("Unsupported audio format"); 241 return (-1);
180 return (-1);
181 }
182 } 242 }
183 243
184 /* Update the fragment size as size in bytes */ 244 /* Update the fragment size as size in bytes */
185 SDL_CalculateAudioSpec(spec); 245 SDL_CalculateAudioSpec(spec);
186
187 /* Set output frequency */
188 #ifdef OLD_IRIX_AUDIO
189 audio_param[0] = AL_OUTPUT_RATE;
190 audio_param[1] = spec->freq;
191 if (ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0) {
192 #else
193 audio_param.param = AL_RATE;
194 audio_param.value.i = spec->freq;
195 if (alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0) {
196 #endif
197 SDL_SetError("alSetParams failed");
198 return (-1);
199 }
200
201 /* Open the audio port with the requested frequency */
202 audio_port = NULL;
203 audio_config = alNewConfig();
204 if (audio_config &&
205 (alSetSampFmt(audio_config, AL_SAMPFMT_TWOSCOMP) >= 0) &&
206 (alSetWidth(audio_config, width) >= 0) &&
207 (alSetQueueSize(audio_config, spec->samples * 2) >= 0) &&
208 (alSetChannels(audio_config, spec->channels) >= 0)) {
209 audio_port = alOpenPort("SDL audio", "w", audio_config);
210 }
211 alFreeConfig(audio_config);
212 if (audio_port == NULL) {
213 SDL_SetError("Unable to open audio port");
214 return (-1);
215 }
216 246
217 /* Allocate mixing buffer */ 247 /* Allocate mixing buffer */
218 mixbuf = (Uint8 *) SDL_AllocAudioMem(spec->size); 248 mixbuf = (Uint8 *) SDL_AllocAudioMem(spec->size);
219 if (mixbuf == NULL) { 249 if (mixbuf == NULL) {
220 SDL_OutOfMemory(); 250 SDL_OutOfMemory();