| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2006 Sam Lantinga |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| Sam Lantinga |
| slouken@libsdl.org |
| */ |
| #include <errno.h> |
| #include "SDL_config.h" |
| |
| /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */ |
| /* patch for IRIX 5 by Georg Schwarz 18/07/2004 */ |
| |
| #include "SDL_timer.h" |
| #include "SDL_audio.h" |
| #include "../SDL_audiomem.h" |
| #include "../SDL_audio_c.h" |
| #include "SDL_irixaudio.h" |
| |
| |
| #ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */ |
| #define OLD_IRIX_AUDIO |
| #define alClosePort(x) ALcloseport(x) |
| #define alFreeConfig(x) ALfreeconfig(x) |
| #define alGetFillable(x) ALgetfillable(x) |
| #define alNewConfig() ALnewconfig() |
| #define alOpenPort(x,y,z) ALopenport(x,y,z) |
| #define alSetChannels(x,y) ALsetchannels(x,y) |
| #define alSetQueueSize(x,y) ALsetqueuesize(x,y) |
| #define alSetSampFmt(x,y) ALsetsampfmt(x,y) |
| #define alSetWidth(x,y) ALsetwidth(x,y) |
| #endif |
| |
| void static |
| IRIXAUDIO_WaitDevice(_THIS) |
| { |
| Sint32 timeleft; |
| |
| timeleft = this->spec.samples - alGetFillable(this->hidden->audio_port); |
| if (timeleft > 0) { |
| timeleft /= (this->spec.freq / 1000); |
| SDL_Delay((Uint32) timeleft); |
| } |
| } |
| |
| static void |
| IRIXAUDIO_PlayDevice(_THIS) |
| { |
| /* Write the audio data out */ |
| ALport port = this->hidden->audio_port; |
| Uint8 *mixbuf = this->hidden->mixbuf; |
| if (alWriteFrames(port, mixbuf, this->spec.samples) < 0) { |
| /* Assume fatal error, for now */ |
| this->enabled = 0; |
| } |
| } |
| |
| static Uint8 * |
| IRIXAUDIO_GetDeviceBuf(_THIS) |
| { |
| return (this->hidden->mixbuf); |
| } |
| |
| static void |
| IRIXAUDIO_CloseDevice(_THIS) |
| { |
| if (this->hidden != NULL) { |
| if (this->hidden->mixbuf != NULL) { |
| SDL_FreeAudioMem(this->hidden->mixbuf); |
| this->hidden->mixbuf = NULL; |
| } |
| if (this->hidden->audio_port != NULL) { |
| alClosePort(this->hidden->audio_port); |
| this->hidden->audio_port = NULL; |
| } |
| SDL_free(this->hidden); |
| this->hidden = NULL; |
| } |
| } |
| |
| static int |
| IRIXAUDIO_OpenDevice(_THIS, const char *devname, int iscapture) |
| { |
| SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format); |
| long width = 0; |
| long fmt = 0; |
| int valid = 0; |
| |
| /* !!! FIXME: Handle multiple devices and capture? */ |
| |
| /* 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)); |
| |
| #ifdef OLD_IRIX_AUDIO |
| { |
| long audio_param[2]; |
| audio_param[0] = AL_OUTPUT_RATE; |
| audio_param[1] = this->spec.freq; |
| valid = (ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0); |
| } |
| #else |
| { |
| ALpv audio_param; |
| audio_param.param = AL_RATE; |
| audio_param.value.i = this->spec.freq; |
| valid = (alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0); |
| } |
| #endif |
| |
| while ((!valid) && (test_format)) { |
| valid = 1; |
| this->spec.format = test_format; |
| |
| switch (test_format) { |
| case AUDIO_S8: |
| width = AL_SAMPLE_8; |
| fmt = AL_SAMPFMT_TWOSCOMP; |
| break; |
| |
| case AUDIO_S16SYS: |
| width = AL_SAMPLE_16; |
| fmt = AL_SAMPFMT_TWOSCOMP; |
| break; |
| |
| case AUDIO_F32SYS: |
| width = 0; /* not used here... */ |
| fmt = AL_SAMPFMT_FLOAT; |
| break; |
| |
| /* Docs say there is int24, but not int32.... */ |
| |
| default: |
| valid = 0; |
| test_format = SDL_NextAudioFormat(); |
| break; |
| } |
| |
| if (valid) { |
| ALconfig audio_config = alNewConfig(); |
| valid = 0; |
| if (audio_config) { |
| if (alSetChannels(audio_config, this->spec.channels) < 0) { |
| if (this->spec.channels > 2) { /* can't handle > stereo? */ |
| this->spec.channels = 2; /* try again below. */ |
| } |
| } |
| |
| if ((alSetSampFmt(audio_config, fmt) >= 0) && |
| ((!width) || (alSetWidth(audio_config, width) >= 0)) && |
| (alSetQueueSize(audio_config,this->spec.samples*2) >= 0) && |
| (alSetChannels(audio_config, this->spec.channels) >= 0)) { |
| |
| this->hidden->audio_port = alOpenPort("SDL audio", "w", |
| audio_config); |
| if (this->hidden->audio_port == NULL) { |
| /* docs say AL_BAD_CHANNELS happens here, too. */ |
| int err = oserror(); |
| if (err == AL_BAD_CHANNELS) { |
| this->spec.channels = 2; |
| alSetChannels(audio_config, this->spec.channels); |
| this->hidden->audio_port = alOpenPort("SDL audio", "w", |
| audio_config); |
| } |
| } |
| |
| if (this->hidden->audio_port != NULL) { |
| valid = 1; |
| } |
| } |
| |
| alFreeConfig(audio_config); |
| } |
| } |
| } |
| |
| if (!valid) { |
| IRIXAUDIO_CloseDevice(this); |
| SDL_SetError("Unsupported audio format"); |
| return 0; |
| } |
| |
| /* Update the fragment size as size in bytes */ |
| SDL_CalculateAudioSpec(&this->spec); |
| |
| /* Allocate mixing buffer */ |
| this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->spec.size); |
| if (this->hidden->mixbuf == NULL) { |
| IRIXAUDIO_CloseDevice(this); |
| SDL_OutOfMemory(); |
| return 0; |
| } |
| SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); |
| |
| /* We're ready to rock and roll. :-) */ |
| return 1; |
| } |
| |
| static int |
| IRIXAUDIO_Init(SDL_AudioDriverImpl *impl) |
| { |
| /* Set the function pointers */ |
| impl->OpenDevice = DSP_OpenDevice; |
| impl->PlayDevice = DSP_PlayDevice; |
| impl->WaitDevice = DSP_WaitDevice; |
| impl->GetDeviceBuf = DSP_GetDeviceBuf; |
| impl->CloseDevice = DSP_CloseDevice; |
| impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: not true, I think. */ |
| |
| return 1; |
| } |
| |
| AudioBootStrap IRIXAUDIO_bootstrap = { |
| "AL", "IRIX DMedia audio", IRIXAUDIO_Init, 0 |
| }; |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
