diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/mint/SDL_mintaudio_dma8.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/audio/mint/SDL_mintaudio_dma8.c | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/mint/SDL_mintaudio_dma8.c b/distrib/sdl-1.2.15/src/audio/mint/SDL_mintaudio_dma8.c new file mode 100644 index 0000000..61feba3 --- /dev/null +++ b/distrib/sdl-1.2.15/src/audio/mint/SDL_mintaudio_dma8.c @@ -0,0 +1,357 @@ +/* + 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; +} |