Good idea, renaming OpenBSD audio to BSD audio.
--HG-- extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401571
This commit is contained in:
Sam Lantinga
parent
b31a8872e5
commit
f1b5352fed
8 changed files with 15 additions and 17 deletions
404
src/audio/bsd/SDL_bsdaudio.c
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404
src/audio/bsd/SDL_bsdaudio.c
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2004 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/*
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* Driver for native OpenBSD/NetBSD audio(4).
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* vedge@vedge.com.ar.
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*/
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/time.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/audioio.h>
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#include "SDL_timer.h"
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#include "SDL_audio.h"
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#include "../SDL_audiomem.h"
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#include "../SDL_audio_c.h"
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#include "../SDL_audiodev_c.h"
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#include "SDL_openbsdaudio.h"
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/* The tag name used by NetBSD/OpenBSD audio */
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#ifdef __NetBSD__
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#define BSD_AUDIO_DRIVER_NAME "netbsd"
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#define BSD_AUDIO_DRIVER_DESC "Native NetBSD audio"
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#else
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#define BSD_AUDIO_DRIVER_NAME "openbsd"
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#define BSD_AUDIO_DRIVER_DESC "Native OpenBSD audio"
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#endif
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/* Open the audio device for playback, and don't block if busy */
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/* #define USE_BLOCKING_WRITES */
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/* Use timer for synchronization */
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/* #define USE_TIMER_SYNC */
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/* #define DEBUG_AUDIO */
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/* #define DEBUG_AUDIO_STREAM */
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#ifdef USE_BLOCKING_WRITES
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#define OPEN_FLAGS O_WRONLY
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#else
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#define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
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#endif
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/* Audio driver functions */
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static void OBSD_WaitAudio(_THIS);
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static int OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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static void OBSD_PlayAudio(_THIS);
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static Uint8 *OBSD_GetAudioBuf(_THIS);
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static void OBSD_CloseAudio(_THIS);
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#ifdef DEBUG_AUDIO
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static void OBSD_Status(_THIS);
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#endif
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/* Audio driver bootstrap functions */
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static int
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Audio_Available(void)
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{
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int fd;
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int available;
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available = 0;
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fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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if(fd >= 0) {
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available = 1;
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close(fd);
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}
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return(available);
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}
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static void
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Audio_DeleteDevice(SDL_AudioDevice *device)
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{
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SDL_free(device->hidden);
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SDL_free(device);
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}
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static SDL_AudioDevice
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*Audio_CreateDevice(int devindex)
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{
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SDL_AudioDevice *this;
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/* Initialize all variables that we clean on shutdown */
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this = (SDL_AudioDevice*)SDL_malloc(sizeof(SDL_AudioDevice));
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if(this) {
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SDL_memset(this, 0, (sizeof *this));
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this->hidden =
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(struct SDL_PrivateAudioData*)SDL_malloc((sizeof *this->hidden));
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}
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if((this == NULL) || (this->hidden == NULL)) {
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SDL_OutOfMemory();
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if(this) SDL_free(this);
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return(0);
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}
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SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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audio_fd = -1;
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/* Set the function pointers */
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this->OpenAudio = OBSD_OpenAudio;
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this->WaitAudio = OBSD_WaitAudio;
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this->PlayAudio = OBSD_PlayAudio;
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this->GetAudioBuf = OBSD_GetAudioBuf;
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this->CloseAudio = OBSD_CloseAudio;
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this->free = Audio_DeleteDevice;
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return this;
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}
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AudioBootStrap OPENBSD_AUDIO_bootstrap = {
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BSD_DRIVER_NAME, BSD_AUDIO_DRIVER_DESC,
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Audio_Available, Audio_CreateDevice
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};
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/* This function waits until it is possible to write a full sound buffer */
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static void
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OBSD_WaitAudio(_THIS)
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{
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#ifndef USE_BLOCKING_WRITES /* Not necessary when using blocking writes */
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/* See if we need to use timed audio synchronization */
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if ( frame_ticks ) {
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/* Use timer for general audio synchronization */
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Sint32 ticks;
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ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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if ( ticks > 0 ) {
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SDL_Delay(ticks);
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}
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} else {
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/* Use select() for audio synchronization */
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fd_set fdset;
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struct timeval timeout;
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FD_ZERO(&fdset);
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FD_SET(audio_fd, &fdset);
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timeout.tv_sec = 10;
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timeout.tv_usec = 0;
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#ifdef DEBUG_AUDIO
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fprintf(stderr, "Waiting for audio to get ready\n");
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#endif
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if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) {
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const char *message =
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"Audio timeout - buggy audio driver? (disabled)";
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/* In general we should never print to the screen,
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but in this case we have no other way of letting
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the user know what happened.
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*/
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fprintf(stderr, "SDL: %s\n", message);
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this->enabled = 0;
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/* Don't try to close - may hang */
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audio_fd = -1;
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#ifdef DEBUG_AUDIO
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fprintf(stderr, "Done disabling audio\n");
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#endif
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}
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#ifdef DEBUG_AUDIO
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fprintf(stderr, "Ready!\n");
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#endif
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}
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#endif /* !USE_BLOCKING_WRITES */
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}
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static void
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OBSD_PlayAudio(_THIS)
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{
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int written, p=0;
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/* Write the audio data, checking for EAGAIN on broken audio drivers */
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do {
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written = write(audio_fd, &mixbuf[p], mixlen-p);
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if (written>0)
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p += written;
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if (written == -1 && errno != 0 && errno != EAGAIN && errno != EINTR)
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{
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/* Non recoverable error has occurred. It should be reported!!! */
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perror("audio");
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break;
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}
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if ( p < written || ((written < 0) && ((errno == 0) || (errno == EAGAIN))) ) {
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SDL_Delay(1); /* Let a little CPU time go by */
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}
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} while ( p < written );
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/* If timer synchronization is enabled, set the next write frame */
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if ( frame_ticks ) {
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next_frame += frame_ticks;
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}
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/* If we couldn't write, assume fatal error for now */
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if ( written < 0 ) {
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this->enabled = 0;
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}
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#ifdef DEBUG_AUDIO
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fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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#endif
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}
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static Uint8
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*OBSD_GetAudioBuf(_THIS)
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{
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return(mixbuf);
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}
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static void
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OBSD_CloseAudio(_THIS)
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{
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if(mixbuf != NULL) {
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SDL_FreeAudioMem(mixbuf);
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mixbuf = NULL;
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}
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if(audio_fd >= 0) {
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close(audio_fd);
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audio_fd = -1;
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}
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}
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#ifdef DEBUG_AUDIO
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void
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OBSD_Status(_THIS)
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{
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audio_info_t info;
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if(ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
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fprintf(stderr,"AUDIO_GETINFO failed.\n");
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return;
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}
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fprintf(stderr,"\n"
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"[play/record info]\n"
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"buffer size : %d bytes\n"
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"sample rate : %i Hz\n"
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"channels : %i\n"
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"precision : %i-bit\n"
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"encoding : 0x%x\n"
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"seek : %i\n"
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"sample count : %i\n"
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"EOF count : %i\n"
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"paused : %s\n"
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"error occured : %s\n"
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"waiting : %s\n"
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"active : %s\n"
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"",
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info.play.buffer_size,
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info.play.sample_rate,
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info.play.channels,
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info.play.precision,
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info.play.encoding,
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info.play.seek,
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info.play.samples,
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info.play.eof,
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info.play.pause ? "yes" : "no",
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info.play.error ? "yes" : "no",
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info.play.waiting ? "yes" : "no",
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info.play.active ? "yes": "no");
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fprintf(stderr,"\n"
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"[audio info]\n"
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"monitor_gain : %i\n"
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"hw block size : %d bytes\n"
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"hi watermark : %i\n"
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"lo watermark : %i\n"
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"audio mode : %s\n"
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"",
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info.monitor_gain,
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info.blocksize,
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info.hiwat, info.lowat,
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(info.mode == AUMODE_PLAY) ? "PLAY"
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: (info.mode = AUMODE_RECORD) ? "RECORD"
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: (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL"
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: "?"));
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}
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#endif /* DEBUG_AUDIO */
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static int
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OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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{
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char audiodev[64];
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Uint16 format;
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audio_info_t info;
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AUDIO_INITINFO(&info);
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/* Calculate the final parameters for this audio specification */
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SDL_CalculateAudioSpec(spec);
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#ifdef USE_TIMER_SYNC
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frame_ticks = 0.0;
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#endif
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/* Open the audio device */
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audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
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if(audio_fd < 0) {
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SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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return(-1);
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}
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/* Set to play mode */
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info.mode = AUMODE_PLAY;
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if(ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) {
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SDL_SetError("Couldn't put device into play mode");
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return(-1);
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}
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mixbuf = NULL;
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AUDIO_INITINFO(&info);
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for (format = SDL_FirstAudioFormat(spec->format);
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format; format = SDL_NextAudioFormat())
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{
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switch(format) {
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case AUDIO_U8:
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info.play.encoding = AUDIO_ENCODING_ULINEAR;
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info.play.precision = 8;
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break;
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case AUDIO_S8:
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info.play.encoding = AUDIO_ENCODING_SLINEAR;
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info.play.precision = 8;
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break;
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case AUDIO_S16LSB:
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info.play.encoding = AUDIO_ENCODING_SLINEAR_LE;
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info.play.precision = 16;
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break;
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case AUDIO_S16MSB:
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info.play.encoding = AUDIO_ENCODING_SLINEAR_BE;
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info.play.precision = 16;
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break;
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case AUDIO_U16LSB:
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info.play.encoding = AUDIO_ENCODING_ULINEAR_LE;
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info.play.precision = 16;
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break;
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case AUDIO_U16MSB:
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info.play.encoding = AUDIO_ENCODING_ULINEAR_BE;
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info.play.precision = 16;
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break;
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default:
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continue;
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}
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if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0)
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break;
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}
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if(!format) {
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SDL_SetError("No supported encoding for 0x%x", spec->format);
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return(-1);
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}
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spec->format = format;
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AUDIO_INITINFO(&info);
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info.play.channels = spec->channels;
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if (ioctl(audio_fd, AUDIO_SETINFO, &info) == -1)
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spec->channels = 1;
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AUDIO_INITINFO(&info);
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info.play.sample_rate = spec->freq;
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info.blocksize = spec->size;
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info.hiwat = 5;
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info.lowat = 3;
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(void)ioctl(audio_fd, AUDIO_SETINFO, &info);
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(void)ioctl(audio_fd, AUDIO_GETINFO, &info);
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spec->freq = info.play.sample_rate;
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/* Allocate mixing buffer */
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mixlen = spec->size;
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mixbuf = (Uint8*)SDL_AllocAudioMem(mixlen);
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if(mixbuf == NULL) {
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return(-1);
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}
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SDL_memset(mixbuf, spec->silence, spec->size);
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/* Get the parent process id (we're the parent of the audio thread) */
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parent = getpid();
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#ifdef DEBUG_AUDIO
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OBSD_Status(this);
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#endif
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/* We're ready to rock and roll. :-) */
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return(0);
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}
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