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Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/mint/SDL_mintaudio_gsxb.c')
-rw-r--r--distrib/sdl-1.2.15/src/audio/mint/SDL_mintaudio_gsxb.c436
1 files changed, 436 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/mint/SDL_mintaudio_gsxb.c b/distrib/sdl-1.2.15/src/audio/mint/SDL_mintaudio_gsxb.c
new file mode 100644
index 0000000..8d7716a
--- /dev/null
+++ b/distrib/sdl-1.2.15/src/audio/mint/SDL_mintaudio_gsxb.c
@@ -0,0 +1,436 @@
+/*
+ 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 (GSXB compatible 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 "SDL_mintaudio.h"
+#include "SDL_mintaudio_gsxb.h"
+
+/*--- Defines ---*/
+
+#define MINT_AUDIO_DRIVER_NAME "mint_gsxb"
+
+/* Debug print info */
+#define DEBUG_NAME "audio:gsxb: "
+#if 0
+#define DEBUG_PRINT(what) \
+ { \
+ printf what; \
+ }
+#else
+#define DEBUG_PRINT(what)
+#endif
+
+/*--- Static variables ---*/
+
+static long cookie_snd, cookie_gsxb;
+
+/*--- 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);
+
+/* GSXB callbacks */
+static void Mint_GsxbInterrupt(void);
+static void Mint_GsxbNullInterrupt(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 _SND present ? if not, assume ST machine */
+ if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
+ cookie_snd = SND_PSG;
+ }
+
+ /* Check if we have 16 bits audio */
+ if ((cookie_snd & SND_16BIT)==0) {
+ DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
+ return(0);
+ }
+
+ /* Cookie GSXB present ? */
+ cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND);
+
+ /* Is it GSXB ? */
+ if (((cookie_snd & SND_GSXB)==0) || (cookie_gsxb==0)) {
+ DEBUG_PRINT((DEBUG_NAME "no GSXB audio\n"));
+ return(0);
+ }
+
+ /* Check if audio is lockable */
+ if (Locksnd()!=1) {
+ DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
+ return(0);
+ }
+
+ Unlocksnd();
+
+ DEBUG_PRINT((DEBUG_NAME "GSXB 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_GSXB_bootstrap = {
+ MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver",
+ Audio_Available, Audio_CreateDevice
+};
+
+static void Mint_LockAudio(_THIS)
+{
+ /* Stop replay */
+ Buffoper(0);
+}
+
+static void Mint_UnlockAudio(_THIS)
+{
+ /* Restart replay */
+ Buffoper(SB_PLA_ENA|SB_PLA_RPT);
+}
+
+static void Mint_CloseAudio(_THIS)
+{
+ /* Stop replay */
+ Buffoper(0);
+
+ /* Uninstall interrupt */
+ if (NSetinterrupt(2, SI_NONE, Mint_GsxbNullInterrupt)<0) {
+ DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n"));
+ }
+
+ /* 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;
+ }
+
+ /* Unlock sound system */
+ Unlocksnd();
+}
+
+static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
+{
+ long snd_format = 0;
+ int i, resolution, format_signed, format_bigendian;
+ Uint16 test_format = SDL_FirstAudioFormat(spec->format);
+ int valid_datatype = 0;
+
+ resolution = spec->format & 0x00ff;
+ format_signed = ((spec->format & 0x8000)!=0);
+ format_bigendian = ((spec->format & 0x1000)!=0);
+
+ 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! */
+ }
+
+ while ((!valid_datatype) && (test_format)) {
+ /* Check formats available */
+ snd_format = Sndstatus(SND_QUERYFORMATS);
+ spec->format = test_format;
+ resolution = spec->format & 0xff;
+ format_signed = (spec->format & (1<<15));
+ format_bigendian = (spec->format & (1<<12));
+ switch (test_format) {
+ case AUDIO_U8:
+ case AUDIO_S8:
+ if (snd_format & SND_FORMAT8) {
+ valid_datatype = 1;
+ snd_format = Sndstatus(SND_QUERY8BIT);
+ }
+ break;
+
+ case AUDIO_U16LSB:
+ case AUDIO_S16LSB:
+ case AUDIO_U16MSB:
+ case AUDIO_S16MSB:
+ if (snd_format & SND_FORMAT16) {
+ valid_datatype = 1;
+ snd_format = Sndstatus(SND_QUERY16BIT);
+ }
+ break;
+
+ default:
+ test_format = SDL_NextAudioFormat();
+ break;
+ }
+ }
+
+ if (!valid_datatype) {
+ SDL_SetError("Unsupported audio format");
+ return (-1);
+ }
+
+ /* Check signed/unsigned format */
+ if (format_signed) {
+ if (snd_format & SND_FORMATSIGNED) {
+ /* Ok */
+ } else if (snd_format & SND_FORMATUNSIGNED) {
+ /* Give unsigned format */
+ spec->format = spec->format & (~0x8000);
+ }
+ } else {
+ if (snd_format & SND_FORMATUNSIGNED) {
+ /* Ok */
+ } else if (snd_format & SND_FORMATSIGNED) {
+ /* Give signed format */
+ spec->format |= 0x8000;
+ }
+ }
+
+ if (format_bigendian) {
+ if (snd_format & SND_FORMATBIGENDIAN) {
+ /* Ok */
+ } else if (snd_format & SND_FORMATLITTLEENDIAN) {
+ /* Give little endian format */
+ spec->format = spec->format & (~0x1000);
+ }
+ } else {
+ if (snd_format & SND_FORMATLITTLEENDIAN) {
+ /* Ok */
+ } else if (snd_format & SND_FORMATBIGENDIAN) {
+ /* Give big endian format */
+ spec->format |= 0x1000;
+ }
+ }
+
+ /* Calculate and select the closest frequency */
+ MINTAUDIO_freqcount=0;
+ for (i=1;i<4;i++) {
+ SDL_MintAudio_AddFrequency(this,
+ MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(1<<i)), MASTERCLOCK_44K,
+ (1<<i)-1, -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)
+{
+ int channels_mode, prediv;
+ void *buffer;
+
+ /* Stop currently playing sound */
+ Buffoper(0);
+
+ /* Set replay tracks */
+ Settracks(0,0);
+ Setmontracks(0);
+
+ /* Select replay format */
+ switch (spec->format & 0xff) {
+ case 8:
+ if (spec->channels==2) {
+ channels_mode=STEREO8;
+ } else {
+ channels_mode=MONO8;
+ }
+ break;
+ case 16:
+ if (spec->channels==2) {
+ channels_mode=STEREO16;
+ } else {
+ channels_mode=MONO16;
+ }
+ break;
+ default:
+ channels_mode=STEREO16;
+ break;
+ }
+ if (Setmode(channels_mode)<0) {
+ DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
+ }
+
+ prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
+ Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1);
+
+ /* Set buffer */
+ buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
+ if (Setbuffer(0, buffer, buffer + spec->size)<0) {
+ DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
+ }
+
+ /* Install interrupt */
+ if (NSetinterrupt(2, SI_PLAY, Mint_GsxbInterrupt)<0) {
+ DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n"));
+ }
+
+ /* Go */
+ Buffoper(SB_PLA_ENA|SB_PLA_RPT);
+ DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
+}
+
+static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
+{
+ /* Lock sound system */
+ if (Locksnd()!=1) {
+ SDL_SetError("Mint_OpenAudio: Audio system already in use");
+ return(-1);
+ }
+
+ 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 */
+}
+
+static void Mint_GsxbInterrupt(void)
+{
+ Uint8 *newbuf;
+
+ if (SDL_MintAudio_mutex)
+ return;
+
+ SDL_MintAudio_mutex=1;
+
+ SDL_MintAudio_numbuf ^= 1;
+ SDL_MintAudio_Callback();
+ newbuf = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
+ Setbuffer(0, newbuf, newbuf + SDL_MintAudio_audiosize);
+
+ SDL_MintAudio_mutex=0;
+}
+
+static void Mint_GsxbNullInterrupt(void)
+{
+}
generated by cgit v1.1 at 2024-05-07 07:10:04 +0000