| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2012 Sam Lantinga |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public |
| License as published by the Free Software Foundation; either |
| version 2 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with this library; if not, write to the Free |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| Sam Lantinga |
| slouken@libsdl.org |
| */ |
| #include "SDL_config.h" |
| |
| /* |
| MiNT audio driver |
| using XBIOS functions (STFA driver) |
| |
| Patrice Mandin |
| */ |
| |
| /* Mint includes */ |
| #include <mint/osbind.h> |
| #include <mint/falcon.h> |
| #include <mint/cookie.h> |
| |
| #include "SDL_audio.h" |
| #include "../SDL_audio_c.h" |
| #include "../SDL_sysaudio.h" |
| |
| #include "../../video/ataricommon/SDL_atarimxalloc_c.h" |
| #include "../../video/ataricommon/SDL_atarisuper.h" |
| |
| #include "SDL_mintaudio.h" |
| #include "SDL_mintaudio_stfa.h" |
| |
| /*--- Defines ---*/ |
| |
| #define MINT_AUDIO_DRIVER_NAME "mint_stfa" |
| |
| /* Debug print info */ |
| #define DEBUG_NAME "audio:stfa: " |
| #if 0 |
| #define DEBUG_PRINT(what) \ |
| { \ |
| printf what; \ |
| } |
| #else |
| #define DEBUG_PRINT(what) |
| #endif |
| |
| /*--- Static variables ---*/ |
| |
| static long cookie_snd, cookie_mch; |
| static cookie_stfa_t *cookie_stfa; |
| |
| static const int freqs[16]={ |
| 4995, 6269, 7493, 8192, |
| 9830, 10971, 12538, 14985, |
| 16384, 19819, 21943, 24576, |
| 30720, 32336, 43885, 49152 |
| }; |
| |
| /*--- Audio driver functions ---*/ |
| |
| static void Mint_CloseAudio(_THIS); |
| static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec); |
| static void Mint_LockAudio(_THIS); |
| static void Mint_UnlockAudio(_THIS); |
| |
| /* To check/init hardware audio */ |
| static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec); |
| static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec); |
| |
| /*--- Audio driver bootstrap functions ---*/ |
| |
| static int Audio_Available(void) |
| { |
| long dummy; |
| const char *envr = SDL_getenv("SDL_AUDIODRIVER"); |
| |
| /* Check if user asked a different audio driver */ |
| if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) { |
| DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n")); |
| return(0); |
| } |
| |
| /* Cookie _MCH present ? if not, assume ST machine */ |
| if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) { |
| cookie_mch = MCH_ST; |
| } |
| |
| /* Cookie _SND present ? if not, assume ST machine */ |
| if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) { |
| cookie_snd = SND_PSG; |
| } |
| |
| /* Cookie STFA present ? */ |
| if (Getcookie(C_STFA, &dummy) != C_FOUND) { |
| DEBUG_PRINT((DEBUG_NAME "no STFA audio\n")); |
| return(0); |
| } |
| cookie_stfa = (cookie_stfa_t *) dummy; |
| |
| SDL_MintAudio_stfa = cookie_stfa; |
| |
| DEBUG_PRINT((DEBUG_NAME "STFA audio available!\n")); |
| return(1); |
| } |
| |
| static void Audio_DeleteDevice(SDL_AudioDevice *device) |
| { |
| SDL_free(device->hidden); |
| SDL_free(device); |
| } |
| |
| static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
| { |
| SDL_AudioDevice *this; |
| |
| /* Initialize all variables that we clean on shutdown */ |
| this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| if ( this ) { |
| SDL_memset(this, 0, (sizeof *this)); |
| this->hidden = (struct SDL_PrivateAudioData *) |
| SDL_malloc((sizeof *this->hidden)); |
| } |
| if ( (this == NULL) || (this->hidden == NULL) ) { |
| SDL_OutOfMemory(); |
| if ( this ) { |
| SDL_free(this); |
| } |
| return(0); |
| } |
| SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| |
| /* Set the function pointers */ |
| this->OpenAudio = Mint_OpenAudio; |
| this->CloseAudio = Mint_CloseAudio; |
| this->LockAudio = Mint_LockAudio; |
| this->UnlockAudio = Mint_UnlockAudio; |
| this->free = Audio_DeleteDevice; |
| |
| return this; |
| } |
| |
| AudioBootStrap MINTAUDIO_STFA_bootstrap = { |
| MINT_AUDIO_DRIVER_NAME, "MiNT STFA audio driver", |
| Audio_Available, Audio_CreateDevice |
| }; |
| |
| static void Mint_LockAudio(_THIS) |
| { |
| void *oldpile; |
| |
| /* Stop replay */ |
| oldpile=(void *)Super(0); |
| cookie_stfa->sound_enable=STFA_PLAY_DISABLE; |
| SuperToUser(oldpile); |
| } |
| |
| static void Mint_UnlockAudio(_THIS) |
| { |
| void *oldpile; |
| |
| /* Restart replay */ |
| oldpile=(void *)Super(0); |
| cookie_stfa->sound_enable=STFA_PLAY_ENABLE|STFA_PLAY_REPEAT; |
| SuperToUser(oldpile); |
| } |
| |
| static void Mint_CloseAudio(_THIS) |
| { |
| void *oldpile; |
| |
| /* Stop replay */ |
| oldpile=(void *)Super(0); |
| cookie_stfa->sound_enable=STFA_PLAY_DISABLE; |
| SuperToUser(oldpile); |
| |
| /* Wait if currently playing sound */ |
| while (SDL_MintAudio_mutex != 0) { |
| } |
| |
| /* Clear buffers */ |
| if (SDL_MintAudio_audiobuf[0]) { |
| Mfree(SDL_MintAudio_audiobuf[0]); |
| SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL; |
| } |
| } |
| |
| static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec) |
| { |
| int i; |
| |
| DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff)); |
| DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0))); |
| DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0))); |
| DEBUG_PRINT(("channels=%d, ", spec->channels)); |
| DEBUG_PRINT(("freq=%d\n", spec->freq)); |
| |
| if (spec->channels > 2) { |
| spec->channels = 2; /* no more than stereo! */ |
| } |
| |
| /* Check formats available */ |
| MINTAUDIO_freqcount=0; |
| for (i=0;i<16;i++) { |
| SDL_MintAudio_AddFrequency(this, freqs[i], 0, i, -1); |
| } |
| |
| #if 1 |
| for (i=0; i<MINTAUDIO_freqcount; i++) { |
| DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n", |
| i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock, |
| MINTAUDIO_frequencies[i].predivisor |
| )); |
| } |
| #endif |
| |
| MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq); |
| spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency; |
| |
| DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff)); |
| DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0))); |
| DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0))); |
| DEBUG_PRINT(("channels=%d, ", spec->channels)); |
| DEBUG_PRINT(("freq=%d\n", spec->freq)); |
| |
| return 0; |
| } |
| |
| static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec) |
| { |
| void *buffer; |
| void *oldpile; |
| |
| buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; |
| |
| oldpile=(void *)Super(0); |
| |
| /* Stop replay */ |
| cookie_stfa->sound_enable=STFA_PLAY_DISABLE; |
| |
| /* Select replay format */ |
| cookie_stfa->sound_control = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor; |
| if ((spec->format & 0xff)==8) { |
| cookie_stfa->sound_control |= STFA_FORMAT_8BIT; |
| } else { |
| cookie_stfa->sound_control |= STFA_FORMAT_16BIT; |
| } |
| if (spec->channels==2) { |
| cookie_stfa->sound_control |= STFA_FORMAT_STEREO; |
| } else { |
| cookie_stfa->sound_control |= STFA_FORMAT_MONO; |
| } |
| if ((spec->format & 0x8000)!=0) { |
| cookie_stfa->sound_control |= STFA_FORMAT_SIGNED; |
| } else { |
| cookie_stfa->sound_control |= STFA_FORMAT_UNSIGNED; |
| } |
| if ((spec->format & 0x1000)!=0) { |
| cookie_stfa->sound_control |= STFA_FORMAT_BIGENDIAN; |
| } else { |
| cookie_stfa->sound_control |= STFA_FORMAT_LITENDIAN; |
| } |
| |
| /* Set buffer */ |
| cookie_stfa->sound_start = (unsigned long) buffer; |
| cookie_stfa->sound_end = (unsigned long) (buffer + spec->size); |
| |
| /* Set interrupt */ |
| cookie_stfa->stfa_it = SDL_MintAudio_StfaInterrupt; |
| |
| /* Restart replay */ |
| cookie_stfa->sound_enable=STFA_PLAY_ENABLE|STFA_PLAY_REPEAT; |
| |
| SuperToUser(oldpile); |
| |
| DEBUG_PRINT((DEBUG_NAME "hardware initialized\n")); |
| } |
| |
| static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec) |
| { |
| SDL_MintAudio_device = this; |
| |
| /* Check audio capabilities */ |
| if (Mint_CheckAudio(this, spec)==-1) { |
| return -1; |
| } |
| |
| SDL_CalculateAudioSpec(spec); |
| |
| /* Allocate memory for audio buffers in DMA-able RAM */ |
| DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size)); |
| |
| SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM); |
| if (SDL_MintAudio_audiobuf[0]==NULL) { |
| SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer"); |
| return (-1); |
| } |
| SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ; |
| SDL_MintAudio_numbuf=0; |
| SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2); |
| SDL_MintAudio_audiosize = spec->size; |
| SDL_MintAudio_mutex = 0; |
| |
| DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0])); |
| DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1])); |
| |
| SDL_MintAudio_CheckFpu(); |
| |
| /* Setup audio hardware */ |
| Mint_InitAudio(this, spec); |
| |
| return(1); /* We don't use threaded audio */ |
| } |