| /* |
| 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 DMA 8bits (hardware access) |
| |
| 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 "SDL_mintaudio.h" |
| #include "SDL_mintaudio_dma8.h" |
| |
| /*--- Defines ---*/ |
| |
| #define MINT_AUDIO_DRIVER_NAME "mint_dma8" |
| |
| /* Debug print info */ |
| #define DEBUG_NAME "audio:dma8: " |
| #if 0 |
| #define DEBUG_PRINT(what) \ |
| { \ |
| printf what; \ |
| } |
| #else |
| #define DEBUG_PRINT(what) |
| #endif |
| |
| /*--- Static variables ---*/ |
| |
| static long cookie_snd, cookie_mch; |
| |
| /*--- 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); |
| |
| /* Functions called in supervisor mode */ |
| static void Mint_InitDma(void); |
| static void Mint_StopReplay(void); |
| static void Mint_StartReplay(void); |
| |
| /*--- Audio driver bootstrap functions ---*/ |
| |
| static int Audio_Available(void) |
| { |
| 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; |
| } |
| |
| /* Check if we have 8 bits audio */ |
| if ((cookie_snd & SND_8BIT)==0) { |
| DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n")); |
| return(0); |
| } |
| |
| /* Check if audio is lockable */ |
| if (cookie_snd & SND_16BIT) { |
| if (Locksnd()!=1) { |
| DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n")); |
| return(0); |
| } |
| |
| Unlocksnd(); |
| } |
| |
| DEBUG_PRINT((DEBUG_NAME "8 bits 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_DMA8_bootstrap = { |
| MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver", |
| Audio_Available, Audio_CreateDevice |
| }; |
| |
| static void Mint_LockAudio(_THIS) |
| { |
| Supexec(Mint_StopReplay); |
| } |
| |
| static void Mint_UnlockAudio(_THIS) |
| { |
| Supexec(Mint_StartReplay); |
| } |
| |
| static void Mint_CloseAudio(_THIS) |
| { |
| Supexec(Mint_StopReplay); |
| |
| DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n")); |
| |
| /* Disable interrupt */ |
| Jdisint(MFP_DMASOUND); |
| |
| DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n")); |
| |
| /* Wait if currently playing sound */ |
| while (SDL_MintAudio_mutex != 0) { |
| } |
| |
| DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n")); |
| |
| /* Clear buffers */ |
| if (SDL_MintAudio_audiobuf[0]) { |
| Mfree(SDL_MintAudio_audiobuf[0]); |
| SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL; |
| } |
| |
| DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n")); |
| } |
| |
| static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec) |
| { |
| int i, masterprediv, sfreq; |
| unsigned long masterclock; |
| |
| 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; |
| |
| /* Check formats available */ |
| spec->format = AUDIO_S8; |
| |
| /* Calculate and select the closest frequency */ |
| sfreq=0; |
| masterclock=MASTERCLOCK_STE; |
| masterprediv=MASTERPREDIV_STE; |
| switch(cookie_mch>>16) { |
| /* |
| case MCH_STE: |
| masterclock=MASTERCLOCK_STE; |
| masterprediv=MASTERPREDIV_STE; |
| break; |
| */ |
| case MCH_TT: |
| masterclock=MASTERCLOCK_TT; |
| masterprediv=MASTERPREDIV_TT; |
| break; |
| case MCH_F30: |
| case MCH_ARANYM: |
| masterclock=MASTERCLOCK_FALCON1; |
| masterprediv=MASTERPREDIV_FALCON; |
| sfreq=1; |
| break; |
| } |
| |
| MINTAUDIO_freqcount=0; |
| for (i=sfreq;i<4;i++) { |
| SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)), |
| masterclock, i-sfreq, -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 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(); |
| |
| /* Set replay tracks */ |
| if (cookie_snd & SND_16BIT) { |
| Settracks(0,0); |
| Setmontracks(0); |
| } |
| |
| Supexec(Mint_InitDma); |
| |
| /* Set interrupt */ |
| Jdisint(MFP_DMASOUND); |
| Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt); |
| Jenabint(MFP_DMASOUND); |
| |
| if (cookie_snd & SND_16BIT) { |
| if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) { |
| DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n")); |
| } |
| } |
| |
| Supexec(Mint_StartReplay); |
| |
| return(1); /* We don't use threaded audio */ |
| } |
| |
| /* Functions called in supervisor mode */ |
| |
| static void Mint_InitDma(void) |
| { |
| unsigned long buffer; |
| unsigned char mode; |
| SDL_AudioDevice *this = SDL_MintAudio_device; |
| |
| Mint_StopReplay(); |
| |
| /* Set buffer */ |
| buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; |
| DMAAUDIO_IO.start_high = (buffer>>16) & 255; |
| DMAAUDIO_IO.start_mid = (buffer>>8) & 255; |
| DMAAUDIO_IO.start_low = buffer & 255; |
| |
| buffer += SDL_MintAudio_audiosize; |
| DMAAUDIO_IO.end_high = (buffer>>16) & 255; |
| DMAAUDIO_IO.end_mid = (buffer>>8) & 255; |
| DMAAUDIO_IO.end_low = buffer & 255; |
| |
| mode = 3-MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor; |
| if (this->spec.channels==1) { |
| mode |= 1<<7; |
| } |
| DMAAUDIO_IO.sound_ctrl = mode; |
| } |
| |
| static void Mint_StopReplay(void) |
| { |
| /* Stop replay */ |
| DMAAUDIO_IO.control=0; |
| } |
| |
| static void Mint_StartReplay(void) |
| { |
| /* Start replay */ |
| DMAAUDIO_IO.control=3; |
| } |