diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/dmedia/SDL_irixaudio.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/audio/dmedia/SDL_irixaudio.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/dmedia/SDL_irixaudio.c b/distrib/sdl-1.2.15/src/audio/dmedia/SDL_irixaudio.c new file mode 100644 index 0000000..1dcd242 --- /dev/null +++ b/distrib/sdl-1.2.15/src/audio/dmedia/SDL_irixaudio.c @@ -0,0 +1,242 @@ +/* + 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 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 "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 + +/* Audio driver functions */ +static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec); +static void AL_WaitAudio(_THIS); +static void AL_PlayAudio(_THIS); +static Uint8 *AL_GetAudioBuf(_THIS); +static void AL_CloseAudio(_THIS); + +/* Audio driver bootstrap functions */ + +static int Audio_Available(void) +{ + 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 = AL_OpenAudio; + this->WaitAudio = AL_WaitAudio; + this->PlayAudio = AL_PlayAudio; + this->GetAudioBuf = AL_GetAudioBuf; + this->CloseAudio = AL_CloseAudio; + + this->free = Audio_DeleteDevice; + + return this; +} + +AudioBootStrap DMEDIA_bootstrap = { + "AL", "IRIX DMedia audio", + Audio_Available, Audio_CreateDevice +}; + + +void static AL_WaitAudio(_THIS) +{ + Sint32 timeleft; + + timeleft = this->spec.samples - alGetFillable(audio_port); + if ( timeleft > 0 ) { + timeleft /= (this->spec.freq/1000); + SDL_Delay((Uint32)timeleft); + } +} + +static void AL_PlayAudio(_THIS) +{ + /* Write the audio data out */ + if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) { + /* Assume fatal error, for now */ + this->enabled = 0; + } +} + +static Uint8 *AL_GetAudioBuf(_THIS) +{ + return(mixbuf); +} + +static void AL_CloseAudio(_THIS) +{ + if ( mixbuf != NULL ) { + SDL_FreeAudioMem(mixbuf); + mixbuf = NULL; + } + if ( audio_port != NULL ) { + alClosePort(audio_port); + audio_port = NULL; + } +} + +static int AL_OpenAudio(_THIS, SDL_AudioSpec * spec) +{ + Uint16 test_format = SDL_FirstAudioFormat(spec->format); + long width = 0; + long fmt = 0; + int valid = 0; + +#ifdef OLD_IRIX_AUDIO + { + long audio_param[2]; + audio_param[0] = AL_OUTPUT_RATE; + audio_param[1] = spec->freq; + valid = (ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0); + } +#else + { + ALpv audio_param; + audio_param.param = AL_RATE; + audio_param.value.i = spec->freq; + valid = (alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0); + } +#endif + + while ((!valid) && (test_format)) { + valid = 1; + 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; + + default: + valid = 0; + test_format = SDL_NextAudioFormat(); + break; + } + + if (valid) { + ALconfig audio_config = alNewConfig(); + valid = 0; + if (audio_config) { + if (alSetChannels(audio_config, spec->channels) < 0) { + if (spec->channels > 2) { /* can't handle > stereo? */ + spec->channels = 2; /* try again below. */ + } + } + + if ((alSetSampFmt(audio_config, fmt) >= 0) && + ((!width) || (alSetWidth(audio_config, width) >= 0)) && + (alSetQueueSize(audio_config, spec->samples * 2) >= 0) && + (alSetChannels(audio_config, spec->channels) >= 0)) { + + audio_port = alOpenPort("SDL audio", "w", audio_config); + if (audio_port == NULL) { + /* docs say AL_BAD_CHANNELS happens here, too. */ + int err = oserror(); + if (err == AL_BAD_CHANNELS) { + spec->channels = 2; + alSetChannels(audio_config, spec->channels); + audio_port = alOpenPort("SDL audio", "w", + audio_config); + } + } + + if (audio_port != NULL) { + valid = 1; + } + } + + alFreeConfig(audio_config); + } + } + } + + if (!valid) { + SDL_SetError("Unsupported audio format"); + return (-1); + } + + /* Update the fragment size as size in bytes */ + SDL_CalculateAudioSpec(spec); + + /* Allocate mixing buffer */ + mixbuf = (Uint8 *) SDL_AllocAudioMem(spec->size); + if (mixbuf == NULL) { + SDL_OutOfMemory(); + return (-1); + } + SDL_memset(mixbuf, spec->silence, spec->size); + + /* We're ready to rock and roll. :-) */ + return (0); +} + |