| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2004 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 unsigned long cookie_snd, cookie_gsxb; |
| |
| /*--- Audio driver functions ---*/ |
| |
| /* GSXB callbacks */ |
| static void MINTGSXB_GsxbInterrupt(void); |
| static void MINTGSXB_GsxbNullInterrupt(void); |
| |
| static void |
| MINTGSXB_LockDevice(_THIS) |
| { |
| /* Stop replay */ |
| Buffoper(0); |
| } |
| |
| static void |
| MINTGSXB_UnlockDevice(_THIS) |
| { |
| /* Restart replay */ |
| Buffoper(SB_PLA_ENA | SB_PLA_RPT); |
| } |
| |
| static void |
| MINTGSXB_CloseDevice(_THIS) |
| { |
| if (this->hidden != NULL) { |
| /* Stop replay */ |
| Buffoper(0); |
| |
| /* Uninstall interrupt */ |
| if (NSetinterrupt(2, SI_NONE, MINTGSXB_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(); |
| |
| SDL_free(this->hidden); |
| this->hidden = NULL; |
| } |
| } |
| |
| static int |
| MINTGSXB_CheckAudio(_THIS) |
| { |
| long snd_format; |
| int i, resolution, format_signed, format_bigendian; |
| SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format); |
| int valid_datatype = 0; |
| |
| resolution = SDL_AUDIO_BITSIZE(this->spec.format); |
| format_signed = SDL_AUDIO_ISSIGNED(this->spec.format); |
| format_bigendian = SDL_AUDIO_ISBIGENDIAN(this->spec.format); |
| |
| DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ", resolution)); |
| DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format))); |
| DEBUG_PRINT(("signed=%d, ", format_signed)); |
| DEBUG_PRINT(("big endian=%d, ", format_bigendian)); |
| DEBUG_PRINT(("channels=%d, ", this->spec.channels)); |
| DEBUG_PRINT(("freq=%d\n", this->spec.freq)); |
| |
| if (this->spec.channels > 2) { |
| this->spec.channels = 2; /* no more than stereo! */ |
| } |
| |
| while ((!valid_datatype) && (test_format)) { |
| /* Check formats available */ |
| snd_format = Sndstatus(SND_QUERYFORMATS); |
| this->spec.format = test_format; |
| resolution = SDL_AUDIO_BITSIZE(this->spec.format); |
| format_signed = SDL_AUDIO_ISSIGNED(this->spec.format); |
| format_bigendian = SDL_AUDIO_ISBIGENDIAN(this->spec.format); |
| 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; |
| |
| case AUDIO_S32LSB: |
| case AUDIO_S32MSB: |
| if (snd_format & SND_FORMAT32) { |
| valid_datatype = 1; |
| snd_format = Sndstatus(SND_QUERY32BIT); |
| } |
| break; |
| |
| /* no float support... */ |
| |
| 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 */ |
| this->spec.format = this->spec.format & (~SDL_AUDIO_MASK_SIGNED); |
| } |
| } else { |
| if (snd_format & SND_FORMATUNSIGNED) { |
| /* Ok */ |
| } else if (snd_format & SND_FORMATSIGNED) { |
| /* Give signed format */ |
| this->spec.format |= SDL_AUDIO_MASK_SIGNED; |
| } |
| } |
| |
| if (format_bigendian) { |
| if (snd_format & SND_FORMATBIGENDIAN) { |
| /* Ok */ |
| } else if (snd_format & SND_FORMATLITTLEENDIAN) { |
| /* Give little endian format */ |
| this->spec.format = this->spec.format & (~SDL_AUDIO_MASK_ENDIAN); |
| } |
| } else { |
| if (snd_format & SND_FORMATLITTLEENDIAN) { |
| /* Ok */ |
| } else if (snd_format & SND_FORMATBIGENDIAN) { |
| /* Give big endian format */ |
| this->spec.format |= SDL_AUDIO_MASK_ENDIAN; |
| } |
| } |
| |
| /* 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, this->spec.freq); |
| this->spec.freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency; |
| |
| DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ", |
| SDL_AUDIO_BITSIZE(this->spec.format))); |
| DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format))); |
| DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format))); |
| DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format))); |
| DEBUG_PRINT(("channels=%d, ", this->spec.channels)); |
| DEBUG_PRINT(("freq=%d\n", this->spec.freq)); |
| |
| return 0; |
| } |
| |
| static void |
| MINTGSXB_InitAudio(_THIS) |
| { |
| int channels_mode, prediv; |
| void *buffer; |
| |
| /* Stop currently playing sound */ |
| Buffoper(0); |
| |
| /* Set replay tracks */ |
| Settracks(0, 0); |
| Setmontracks(0); |
| |
| /* Select replay format */ |
| switch (SDL_AUDIO_BITSIZE(this->spec.format)) { |
| case 8: |
| if (this->spec.channels == 2) { |
| channels_mode = STEREO8; |
| } else { |
| channels_mode = MONO8; |
| } |
| break; |
| case 16: |
| if (this->spec.channels == 2) { |
| channels_mode = STEREO16; |
| } else { |
| channels_mode = MONO16; |
| } |
| break; |
| case 32: |
| if (this->spec.channels == 2) { |
| channels_mode = STEREO32; |
| } else { |
| channels_mode = MONO32; |
| } |
| 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 + this->spec.size) < 0) { |
| DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n")); |
| } |
| |
| /* Install interrupt */ |
| if (NSetinterrupt(2, SI_PLAY, MINTGSXB_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 |
| MINTGSXB_OpenDevice(_THIS, const char *devname, int iscapture) |
| { |
| /* Lock sound system */ |
| if (Locksnd() != 1) { |
| SDL_SetError("MINTGSXB_OpenDevice: Audio system already in use"); |
| return 0; |
| } |
| |
| SDL_MintAudio_device = this; |
| |
| /* Check audio capabilities */ |
| if (MINTGSXB_CheckAudio(this) == -1) { |
| return 0; |
| } |
| |
| /* Initialize all variables that we clean on shutdown */ |
| this->hidden = (struct SDL_PrivateAudioData *) |
| SDL_malloc((sizeof *this->hidden)); |
| if (this->hidden == NULL) { |
| SDL_OutOfMemory(); |
| return 0; |
| } |
| SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| |
| SDL_CalculateAudioSpec(&this->spec); |
| |
| /* Allocate memory for audio buffers in DMA-able RAM */ |
| DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", this->spec.size)); |
| |
| SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(this->spec.size * 2, MX_STRAM); |
| if (SDL_MintAudio_audiobuf[0] == NULL) { |
| SDL_free(this->hidden); |
| this->hidden = NULL; |
| SDL_OutOfMemory(); |
| return 0; |
| } |
| SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + this->spec.size; |
| SDL_MintAudio_numbuf = 0; |
| SDL_memset(SDL_MintAudio_audiobuf[0],this->spec.silence,this->spec.size*2); |
| SDL_MintAudio_audiosize = this->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 */ |
| MINTGSXB_InitAudio(this); |
| |
| return 1; /* good to go. */ |
| } |
| |
| static void |
| MINTGSXB_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 |
| MINTGSXB_GsxbNullInterrupt(void) |
| { |
| } |
| |
| static int |
| MINTGSXB_Init(SDL_AudioDriverImpl *impl) |
| { |
| /* 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) { |
| SDL_SetError(DEBUG_NAME "no 16-bit sound"); |
| 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)) { |
| SDL_SetError(DEBUG_NAME "no GSXB audio"); |
| return 0; |
| } |
| |
| /* Check if audio is lockable */ |
| if (Locksnd() != 1) { |
| SDL_SetError(DEBUG_NAME "audio locked by other application"); |
| return 0; |
| } |
| |
| Unlocksnd(); |
| |
| DEBUG_PRINT((DEBUG_NAME "GSXB audio available!\n")); |
| |
| /* Set the function pointers */ |
| impl->OpenDevice = MINTGSXB_OpenDevice; |
| impl->CloseDevice = MINTGSXB_CloseDevice; |
| impl->LockAudio = MINTGSXB_LockAudio; |
| impl->UnlockAudio = MINTGSXB_UnlockAudio; |
| impl->OnlyHasDefaultOutputDevice = 1; |
| impl->ProvidesOwnCallbackThread = 1; |
| impl->SkipMixerLock = 1; |
| |
| return 1; |
| } |
| |
| AudioBootStrap MINTAUDIO_GSXB_bootstrap = { |
| MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver", MINTGSXB_Init, 0 |
| }; |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
