diff options
Diffstat (limited to 'distrib/sdl-1.2.12/src/audio/dsp/SDL_dspaudio.c')
| -rw-r--r-- | distrib/sdl-1.2.12/src/audio/dsp/SDL_dspaudio.c | 340 |
1 files changed, 0 insertions, 340 deletions
diff --git a/distrib/sdl-1.2.12/src/audio/dsp/SDL_dspaudio.c b/distrib/sdl-1.2.12/src/audio/dsp/SDL_dspaudio.c deleted file mode 100644 index 95617e3..0000000 --- a/distrib/sdl-1.2.12/src/audio/dsp/SDL_dspaudio.c +++ /dev/null @@ -1,340 +0,0 @@ -/* - 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 - - Modified in Oct 2004 by Hannu Savolainen - hannu@opensound.com -*/ -#include "SDL_config.h" - -/* Allow access to a raw mixing buffer */ - -#include <stdio.h> /* For perror() */ -#include <string.h> /* For strerror() */ -#include <errno.h> -#include <unistd.h> -#include <fcntl.h> -#include <signal.h> -#include <sys/time.h> -#include <sys/ioctl.h> -#include <sys/stat.h> - -#if SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H -/* This is installed on some systems */ -#include <soundcard.h> -#else -/* This is recommended by OSS */ -#include <sys/soundcard.h> -#endif - -#include "SDL_timer.h" -#include "SDL_audio.h" -#include "../SDL_audiomem.h" -#include "../SDL_audio_c.h" -#include "../SDL_audiodev_c.h" -#include "SDL_dspaudio.h" - -/* The tag name used by DSP audio */ -#define DSP_DRIVER_NAME "dsp" - -/* Open the audio device for playback, and don't block if busy */ -#define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) - -/* Audio driver functions */ -static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec); -static void DSP_WaitAudio(_THIS); -static void DSP_PlayAudio(_THIS); -static Uint8 *DSP_GetAudioBuf(_THIS); -static void DSP_CloseAudio(_THIS); - -/* Audio driver bootstrap functions */ - -static int Audio_Available(void) -{ - int fd; - int available; - - available = 0; - fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); - if ( fd >= 0 ) { - available = 1; - close(fd); - } - return(available); -} - -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)); - audio_fd = -1; - - /* Set the function pointers */ - this->OpenAudio = DSP_OpenAudio; - this->WaitAudio = DSP_WaitAudio; - this->PlayAudio = DSP_PlayAudio; - this->GetAudioBuf = DSP_GetAudioBuf; - this->CloseAudio = DSP_CloseAudio; - - this->free = Audio_DeleteDevice; - - return this; -} - -AudioBootStrap DSP_bootstrap = { - DSP_DRIVER_NAME, "OSS /dev/dsp standard audio", - Audio_Available, Audio_CreateDevice -}; - -/* This function waits until it is possible to write a full sound buffer */ -static void DSP_WaitAudio(_THIS) -{ - /* Not needed at all since OSS handles waiting automagically */ -} - -static void DSP_PlayAudio(_THIS) -{ - if (write(audio_fd, mixbuf, mixlen)==-1) - { - perror("Audio write"); - this->enabled = 0; - } - -#ifdef DEBUG_AUDIO - fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen); -#endif -} - -static Uint8 *DSP_GetAudioBuf(_THIS) -{ - return(mixbuf); -} - -static void DSP_CloseAudio(_THIS) -{ - if ( mixbuf != NULL ) { - SDL_FreeAudioMem(mixbuf); - mixbuf = NULL; - } - if ( audio_fd >= 0 ) { - close(audio_fd); - audio_fd = -1; - } -} - -static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec) -{ - char audiodev[1024]; - int format; - int value; - int frag_spec; - Uint16 test_format; - - /* Make sure fragment size stays a power of 2, or OSS fails. */ - /* I don't know which of these are actually legal values, though... */ - if (spec->channels > 8) - spec->channels = 8; - else if (spec->channels > 4) - spec->channels = 4; - else if (spec->channels > 2) - spec->channels = 2; - - /* Open the audio device */ - audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); - if ( audio_fd < 0 ) { - SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); - return(-1); - } - mixbuf = NULL; - - /* Make the file descriptor use blocking writes with fcntl() */ - { long flags; - flags = fcntl(audio_fd, F_GETFL); - flags &= ~O_NONBLOCK; - if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) { - SDL_SetError("Couldn't set audio blocking mode"); - DSP_CloseAudio(this); - return(-1); - } - } - - /* Get a list of supported hardware formats */ - if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) { - perror("SNDCTL_DSP_GETFMTS"); - SDL_SetError("Couldn't get audio format list"); - DSP_CloseAudio(this); - return(-1); - } - - /* Try for a closest match on audio format */ - format = 0; - for ( test_format = SDL_FirstAudioFormat(spec->format); - ! format && test_format; ) { -#ifdef DEBUG_AUDIO - fprintf(stderr, "Trying format 0x%4.4x\n", test_format); -#endif - switch ( test_format ) { - case AUDIO_U8: - if ( value & AFMT_U8 ) { - format = AFMT_U8; - } - break; - case AUDIO_S16LSB: - if ( value & AFMT_S16_LE ) { - format = AFMT_S16_LE; - } - break; - case AUDIO_S16MSB: - if ( value & AFMT_S16_BE ) { - format = AFMT_S16_BE; - } - break; -#if 0 -/* - * These formats are not used by any real life systems so they are not - * needed here. - */ - case AUDIO_S8: - if ( value & AFMT_S8 ) { - format = AFMT_S8; - } - break; - case AUDIO_U16LSB: - if ( value & AFMT_U16_LE ) { - format = AFMT_U16_LE; - } - break; - case AUDIO_U16MSB: - if ( value & AFMT_U16_BE ) { - format = AFMT_U16_BE; - } - break; -#endif - default: - format = 0; - break; - } - if ( ! format ) { - test_format = SDL_NextAudioFormat(); - } - } - if ( format == 0 ) { - SDL_SetError("Couldn't find any hardware audio formats"); - DSP_CloseAudio(this); - return(-1); - } - spec->format = test_format; - - /* Set the audio format */ - value = format; - if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || - (value != format) ) { - perror("SNDCTL_DSP_SETFMT"); - SDL_SetError("Couldn't set audio format"); - DSP_CloseAudio(this); - return(-1); - } - - /* Set the number of channels of output */ - value = spec->channels; - if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) { - perror("SNDCTL_DSP_CHANNELS"); - SDL_SetError("Cannot set the number of channels"); - DSP_CloseAudio(this); - return(-1); - } - spec->channels = value; - - /* Set the DSP frequency */ - value = spec->freq; - if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) { - perror("SNDCTL_DSP_SPEED"); - SDL_SetError("Couldn't set audio frequency"); - DSP_CloseAudio(this); - return(-1); - } - spec->freq = value; - - /* Calculate the final parameters for this audio specification */ - SDL_CalculateAudioSpec(spec); - - /* Determine the power of two of the fragment size */ - for ( frag_spec = 0; (0x01U<<frag_spec) < spec->size; ++frag_spec ); - if ( (0x01U<<frag_spec) != spec->size ) { - SDL_SetError("Fragment size must be a power of two"); - DSP_CloseAudio(this); - return(-1); - } - frag_spec |= 0x00020000; /* two fragments, for low latency */ - - /* Set the audio buffering parameters */ -#ifdef DEBUG_AUDIO - fprintf(stderr, "Requesting %d fragments of size %d\n", - (frag_spec >> 16), 1<<(frag_spec&0xFFFF)); -#endif - if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) { - perror("SNDCTL_DSP_SETFRAGMENT"); - } -#ifdef DEBUG_AUDIO - { audio_buf_info info; - ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info); - fprintf(stderr, "fragments = %d\n", info.fragments); - fprintf(stderr, "fragstotal = %d\n", info.fragstotal); - fprintf(stderr, "fragsize = %d\n", info.fragsize); - fprintf(stderr, "bytes = %d\n", info.bytes); - } -#endif - - /* Allocate mixing buffer */ - mixlen = spec->size; - mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); - if ( mixbuf == NULL ) { - DSP_CloseAudio(this); - return(-1); - } - SDL_memset(mixbuf, spec->silence, spec->size); - - /* Get the parent process id (we're the parent of the audio thread) */ - parent = getpid(); - - /* We're ready to rock and roll. :-) */ - return(0); -} |