Mercurial > sdl-ios-xcode
comparison src/audio/mint/SDL_mintaudio_gsxb.c @ 961:185acc07127a
Date: Fri, 29 Oct 2004 11:47:09 +0200
From: Patrice Mandin
Subject: Reworked audio drivers for Atari platform
These are reworked audio drivers for the Atari platform.
Previous drivers were missing some features:
- Test external clock plugged to DSP port on Atari Falcon 030.
- Ability to select internal or external clock.
So now, I generate a list of frequencies available, with the master clock
and predivisor to use. One big caveat to this: I do not have an external
clock, so I hope it works.
| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Fri, 29 Oct 2004 09:56:53 +0000 |
| parents | b8d311d90021 |
| children | 176240cf4405 |
comparison
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| 960:eec28a5278be | 961:185acc07127a |
|---|---|
| 51 | 51 |
| 52 #define MINT_AUDIO_DRIVER_NAME "mint_gsxb" | 52 #define MINT_AUDIO_DRIVER_NAME "mint_gsxb" |
| 53 | 53 |
| 54 /* Debug print info */ | 54 /* Debug print info */ |
| 55 #define DEBUG_NAME "audio:gsxb: " | 55 #define DEBUG_NAME "audio:gsxb: " |
| 56 #if 0 | 56 #if 1 |
| 57 #define DEBUG_PRINT(what) \ | 57 #define DEBUG_PRINT(what) \ |
| 58 { \ | 58 { \ |
| 59 printf what; \ | 59 printf what; \ |
| 60 } | 60 } |
| 61 #else | 61 #else |
| 177 static void Mint_CloseAudio(_THIS) | 177 static void Mint_CloseAudio(_THIS) |
| 178 { | 178 { |
| 179 /* Stop replay */ | 179 /* Stop replay */ |
| 180 Buffoper(0); | 180 Buffoper(0); |
| 181 | 181 |
| 182 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n")); | |
| 183 | |
| 184 /* Uninstall interrupt */ | 182 /* Uninstall interrupt */ |
| 185 if (NSetinterrupt(2, SI_NONE, SDL_MintAudio_EmptyGsxbInterrupt)<0) { | 183 if (NSetinterrupt(2, SI_NONE, SDL_MintAudio_EmptyGsxbInterrupt)<0) { |
| 186 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n")); | 184 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n")); |
| 187 } | 185 } |
| 188 | 186 |
| 189 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n")); | |
| 190 | |
| 191 /* Wait if currently playing sound */ | 187 /* Wait if currently playing sound */ |
| 192 while (SDL_MintAudio_mutex != 0) { | 188 while (SDL_MintAudio_mutex != 0) { |
| 193 } | 189 } |
| 194 | |
| 195 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n")); | |
| 196 | 190 |
| 197 /* Clear buffers */ | 191 /* Clear buffers */ |
| 198 if (SDL_MintAudio_audiobuf[0]) { | 192 if (SDL_MintAudio_audiobuf[0]) { |
| 199 Mfree(SDL_MintAudio_audiobuf[0]); | 193 Mfree(SDL_MintAudio_audiobuf[0]); |
| 200 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL; | 194 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL; |
| 201 } | 195 } |
| 202 | |
| 203 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n")); | |
| 204 | 196 |
| 205 /* Unlock sound system */ | 197 /* Unlock sound system */ |
| 206 Unlocksnd(); | 198 Unlocksnd(); |
| 207 } | 199 } |
| 208 | 200 |
| 276 spec->format |= 0x1000; | 268 spec->format |= 0x1000; |
| 277 } | 269 } |
| 278 } | 270 } |
| 279 | 271 |
| 280 /* Calculate and select the closest frequency */ | 272 /* Calculate and select the closest frequency */ |
| 281 MINTAUDIO_sfreq=1; | 273 MINTAUDIO_freqcount=0; |
| 282 MINTAUDIO_nfreq=12; | 274 for (i=1;i<4;i++) { |
| 283 for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) { | 275 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(1<<i)), MASTERCLOCK_44K, (1<<i)-1); |
| 284 MINTAUDIO_hardfreq[i]=MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(i+1)); | 276 } |
| 285 DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i])); | 277 |
| 286 } | 278 #if 1 |
| 287 | 279 for (i=0; i<MINTAUDIO_freqcount; i++) { |
| 288 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 1, spec->freq); | 280 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n", |
| 289 spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq]; | 281 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock, |
| 282 MINTAUDIO_frequencies[i].predivisor | |
| 283 )); | |
| 284 } | |
| 285 #endif | |
| 286 | |
| 287 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq); | |
| 288 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency; | |
| 290 | 289 |
| 291 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff)); | 290 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff)); |
| 292 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0))); | 291 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0))); |
| 293 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0))); | 292 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0))); |
| 294 DEBUG_PRINT(("channels=%d, ", spec->channels)); | 293 DEBUG_PRINT(("channels=%d, ", spec->channels)); |
| 297 return 0; | 296 return 0; |
| 298 } | 297 } |
| 299 | 298 |
| 300 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec) | 299 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec) |
| 301 { | 300 { |
| 302 int channels_mode; | 301 int channels_mode, prediv; |
| 303 void *buffer; | 302 void *buffer; |
| 304 | 303 |
| 305 /* Stop currently playing sound */ | 304 /* Stop currently playing sound */ |
| 306 Buffoper(0); | 305 Buffoper(0); |
| 307 | 306 |
| 331 } | 330 } |
| 332 if (Setmode(channels_mode)<0) { | 331 if (Setmode(channels_mode)<0) { |
| 333 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n")); | 332 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n")); |
| 334 } | 333 } |
| 335 | 334 |
| 336 Devconnect(DMAPLAY, DAC, CLKEXT, MINTAUDIO_numfreq, 1); | 335 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor; |
| 336 Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1); | |
| 337 | 337 |
| 338 /* Set buffer */ | 338 /* Set buffer */ |
| 339 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; | 339 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; |
| 340 if (Setbuffer(0, buffer, buffer + spec->size)<0) { | 340 if (Setbuffer(0, buffer, buffer + spec->size)<0) { |
| 341 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n")); | 341 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n")); |