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comparison src/audio/baudio/SDL_beaudio.cc @ 1997:46319c67b3d7

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Added int32 and float32 support (and some others!) to BeOS audio backend. Untested: No BeOS system here for compiling!
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 31 Aug 2006 22:15:07 +0000
parents c121d94672cb
children cbac0f77a799
comparison
equal deleted inserted replaced
1996:f25d771fe6f2 1997:46319c67b3d7
154 } 154 }
155 155
156 int BE_OpenAudio(_THIS, SDL_AudioSpec * spec) 156 int BE_OpenAudio(_THIS, SDL_AudioSpec * spec)
157 { 157 {
158 media_raw_audio_format format; 158 media_raw_audio_format format;
159 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
160 int valid_datatype = 0;
161
162 /* Parse the audio format and fill the Be raw audio format */
163 memset(&format, '\0', sizeof (media_raw_audio_format));
164 format.byte_order = B_MEDIA_LITTLE_ENDIAN;
165 format.frame_rate = (float) spec->freq;
166 format.channel_count = spec->channels; /* !!! FIXME: support > 2? */
167 while ((!valid_datatype) && (test_format)) {
168 spec->format = test_format;
169 switch (test_format) {
170 case AUDIO_S8:
171 valid_datatype = 1;
172 format.format = media_raw_audio_format::B_AUDIO_CHAR;
173 break;
174
175 case AUDIO_U8:
176 valid_datatype = 1;
177 format.format = media_raw_audio_format::B_AUDIO_UCHAR;
178 break;
179
180 case AUDIO_S16LSB:
181 valid_datatype = 1;
182 format.format = media_raw_audio_format::B_AUDIO_SHORT;
183 break;
184
185 case AUDIO_S16MSB:
186 valid_datatype = 1;
187 format.format = media_raw_audio_format::B_AUDIO_SHORT;
188 format.byte_order = B_MEDIA_BIG_ENDIAN;
189 break;
190
191 case AUDIO_S32LSB:
192 valid_datatype = 1;
193 format.format = media_raw_audio_format::B_AUDIO_INT;
194 break;
195
196 case AUDIO_S32MSB:
197 valid_datatype = 1;
198 format.format = media_raw_audio_format::B_AUDIO_INT;
199 format.byte_order = B_MEDIA_BIG_ENDIAN;
200 break;
201
202 case AUDIO_F32LSB:
203 valid_datatype = 1;
204 format.format = media_raw_audio_format::B_AUDIO_FLOAT;
205 break;
206
207 case AUDIO_F32MSB:
208 valid_datatype = 1;
209 format.format = media_raw_audio_format::B_AUDIO_FLOAT;
210 format.byte_order = B_MEDIA_BIG_ENDIAN;
211 break;
212
213 default:
214 test_format = SDL_NextAudioFormat();
215 break;
216 }
217 }
218
219 format.buffer_size = spec->samples;
220
221 if (!valid_datatype) { /* shouldn't happen, but just in case... */
222 SDL_SetError("Unsupported audio format");
223 return (-1);
224 }
159 225
160 /* Initialize the Be Application, if it's not already started */ 226 /* Initialize the Be Application, if it's not already started */
161 if (SDL_InitBeApp() < 0) { 227 if (SDL_InitBeApp() < 0) {
162 return (-1); 228 return (-1);
163 } 229 }
164
165 /* Parse the audio format and fill the Be raw audio format */
166 format.frame_rate = (float) spec->freq;
167 format.channel_count = spec->channels;
168 switch (spec->format & ~0x1000) {
169 case AUDIO_S8:
170 /* Signed 8-bit audio unsupported, convert to U8 */
171 spec->format = AUDIO_U8;
172 case AUDIO_U8:
173 format.format = media_raw_audio_format::B_AUDIO_UCHAR;
174 format.byte_order = 0;
175 break;
176 case AUDIO_U16:
177 /* Unsigned 16-bit audio unsupported, convert to S16 */
178 spec->format ^= 0x8000;
179 case AUDIO_S16:
180 format.format = media_raw_audio_format::B_AUDIO_SHORT;
181 if (spec->format & 0x1000) {
182 format.byte_order = 1; /* Big endian */
183 } else {
184 format.byte_order = 2; /* Little endian */
185 }
186 break;
187 }
188 format.buffer_size = spec->samples;
189 230
190 /* Calculate the final parameters for this audio specification */ 231 /* Calculate the final parameters for this audio specification */
191 SDL_CalculateAudioSpec(spec); 232 SDL_CalculateAudioSpec(spec);
192 233
193 /* Subscribe to the audio stream (creates a new thread) */ 234 /* Subscribe to the audio stream (creates a new thread) */