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Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/bsd/SDL_bsdaudio.c')
-rw-r--r--distrib/sdl-1.2.15/src/audio/bsd/SDL_bsdaudio.c404
1 files changed, 404 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/bsd/SDL_bsdaudio.c b/distrib/sdl-1.2.15/src/audio/bsd/SDL_bsdaudio.c
new file mode 100644
index 0000000..e5e0d94
--- /dev/null
+++ b/distrib/sdl-1.2.15/src/audio/bsd/SDL_bsdaudio.c
@@ -0,0 +1,404 @@
+/*
+ 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 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"
+
+/*
+ * Driver for native OpenBSD/NetBSD audio(4).
+ * vedge@vedge.com.ar.
+ */
+
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/audioio.h>
+
+#include "SDL_timer.h"
+#include "SDL_audio.h"
+#include "../SDL_audiomem.h"
+#include "../SDL_audio_c.h"
+#include "../SDL_audiodev_c.h"
+#include "SDL_bsdaudio.h"
+
+/* The tag name used by NetBSD/OpenBSD audio */
+#ifdef __NetBSD__
+#define BSD_AUDIO_DRIVER_NAME "netbsd"
+#define BSD_AUDIO_DRIVER_DESC "Native NetBSD audio"
+#else
+#define BSD_AUDIO_DRIVER_NAME "openbsd"
+#define BSD_AUDIO_DRIVER_DESC "Native OpenBSD audio"
+#endif
+
+/* Open the audio device for playback, and don't block if busy */
+/* #define USE_BLOCKING_WRITES */
+
+/* Use timer for synchronization */
+/* #define USE_TIMER_SYNC */
+
+/* #define DEBUG_AUDIO */
+/* #define DEBUG_AUDIO_STREAM */
+
+#ifdef USE_BLOCKING_WRITES
+#define OPEN_FLAGS O_WRONLY
+#else
+#define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
+#endif
+
+/* Audio driver functions */
+static void OBSD_WaitAudio(_THIS);
+static int OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec);
+static void OBSD_PlayAudio(_THIS);
+static Uint8 *OBSD_GetAudioBuf(_THIS);
+static void OBSD_CloseAudio(_THIS);
+
+#ifdef DEBUG_AUDIO
+static void OBSD_Status(_THIS);
+#endif
+
+/* 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 = OBSD_OpenAudio;
+ this->WaitAudio = OBSD_WaitAudio;
+ this->PlayAudio = OBSD_PlayAudio;
+ this->GetAudioBuf = OBSD_GetAudioBuf;
+ this->CloseAudio = OBSD_CloseAudio;
+
+ this->free = Audio_DeleteDevice;
+
+ return this;
+}
+
+AudioBootStrap BSD_AUDIO_bootstrap = {
+ BSD_AUDIO_DRIVER_NAME, BSD_AUDIO_DRIVER_DESC,
+ Audio_Available, Audio_CreateDevice
+};
+
+/* This function waits until it is possible to write a full sound buffer */
+static void
+OBSD_WaitAudio(_THIS)
+{
+#ifndef USE_BLOCKING_WRITES /* Not necessary when using blocking writes */
+ /* See if we need to use timed audio synchronization */
+ if ( frame_ticks ) {
+ /* Use timer for general audio synchronization */
+ Sint32 ticks;
+
+ ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
+ if ( ticks > 0 ) {
+ SDL_Delay(ticks);
+ }
+ } else {
+ /* Use select() for audio synchronization */
+ fd_set fdset;
+ struct timeval timeout;
+
+ FD_ZERO(&fdset);
+ FD_SET(audio_fd, &fdset);
+ timeout.tv_sec = 10;
+ timeout.tv_usec = 0;
+#ifdef DEBUG_AUDIO
+ fprintf(stderr, "Waiting for audio to get ready\n");
+#endif
+ if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) {
+ const char *message =
+ "Audio timeout - buggy audio driver? (disabled)";
+ /* In general we should never print to the screen,
+ but in this case we have no other way of letting
+ the user know what happened.
+ */
+ fprintf(stderr, "SDL: %s\n", message);
+ this->enabled = 0;
+ /* Don't try to close - may hang */
+ audio_fd = -1;
+#ifdef DEBUG_AUDIO
+ fprintf(stderr, "Done disabling audio\n");
+#endif
+ }
+#ifdef DEBUG_AUDIO
+ fprintf(stderr, "Ready!\n");
+#endif
+ }
+#endif /* !USE_BLOCKING_WRITES */
+}
+
+static void
+OBSD_PlayAudio(_THIS)
+{
+ int written, p=0;
+
+ /* Write the audio data, checking for EAGAIN on broken audio drivers */
+ do {
+ written = write(audio_fd, &mixbuf[p], mixlen-p);
+ if (written>0)
+ p += written;
+ if (written == -1 && errno != 0 && errno != EAGAIN && errno != EINTR)
+ {
+ /* Non recoverable error has occurred. It should be reported!!! */
+ perror("audio");
+ break;
+ }
+
+ if ( p < written || ((written < 0) && ((errno == 0) || (errno == EAGAIN))) ) {
+ SDL_Delay(1); /* Let a little CPU time go by */
+ }
+ } while ( p < written );
+
+ /* If timer synchronization is enabled, set the next write frame */
+ if ( frame_ticks ) {
+ next_frame += frame_ticks;
+ }
+
+ /* If we couldn't write, assume fatal error for now */
+ if ( written < 0 ) {
+ this->enabled = 0;
+ }
+#ifdef DEBUG_AUDIO
+ fprintf(stderr, "Wrote %d bytes of audio data\n", written);
+#endif
+}
+
+static Uint8
+*OBSD_GetAudioBuf(_THIS)
+{
+ return(mixbuf);
+}
+
+static void
+OBSD_CloseAudio(_THIS)
+{
+ if(mixbuf != NULL) {
+ SDL_FreeAudioMem(mixbuf);
+ mixbuf = NULL;
+ }
+ if(audio_fd >= 0) {
+ close(audio_fd);
+ audio_fd = -1;
+ }
+}
+
+#ifdef DEBUG_AUDIO
+void
+OBSD_Status(_THIS)
+{
+ audio_info_t info;
+
+ if(ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
+ fprintf(stderr,"AUDIO_GETINFO failed.\n");
+ return;
+ }
+
+ fprintf(stderr,"\n"
+"[play/record info]\n"
+"buffer size : %d bytes\n"
+"sample rate : %i Hz\n"
+"channels : %i\n"
+"precision : %i-bit\n"
+"encoding : 0x%x\n"
+"seek : %i\n"
+"sample count : %i\n"
+"EOF count : %i\n"
+"paused : %s\n"
+"error occured : %s\n"
+"waiting : %s\n"
+"active : %s\n"
+"",
+ info.play.buffer_size,
+ info.play.sample_rate,
+ info.play.channels,
+ info.play.precision,
+ info.play.encoding,
+ info.play.seek,
+ info.play.samples,
+ info.play.eof,
+ info.play.pause ? "yes" : "no",
+ info.play.error ? "yes" : "no",
+ info.play.waiting ? "yes" : "no",
+ info.play.active ? "yes": "no");
+
+ fprintf(stderr,"\n"
+"[audio info]\n"
+"monitor_gain : %i\n"
+"hw block size : %d bytes\n"
+"hi watermark : %i\n"
+"lo watermark : %i\n"
+"audio mode : %s\n"
+"",
+ info.monitor_gain,
+ info.blocksize,
+ info.hiwat, info.lowat,
+ (info.mode == AUMODE_PLAY) ? "PLAY"
+ : (info.mode = AUMODE_RECORD) ? "RECORD"
+ : (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL"
+ : "?"));
+}
+#endif /* DEBUG_AUDIO */
+
+static int
+OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec)
+{
+ char audiodev[64];
+ Uint16 format;
+ audio_info_t info;
+
+ AUDIO_INITINFO(&info);
+
+ /* Calculate the final parameters for this audio specification */
+ SDL_CalculateAudioSpec(spec);
+
+#ifdef USE_TIMER_SYNC
+ frame_ticks = 0.0;
+#endif
+
+ /* 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);
+ }
+
+ /* Set to play mode */
+ info.mode = AUMODE_PLAY;
+ if(ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) {
+ SDL_SetError("Couldn't put device into play mode");
+ return(-1);
+ }
+
+ mixbuf = NULL;
+ AUDIO_INITINFO(&info);
+ for (format = SDL_FirstAudioFormat(spec->format);
+ format; format = SDL_NextAudioFormat())
+ {
+ switch(format) {
+ case AUDIO_U8:
+ info.play.encoding = AUDIO_ENCODING_ULINEAR;
+ info.play.precision = 8;
+ break;
+ case AUDIO_S8:
+ info.play.encoding = AUDIO_ENCODING_SLINEAR;
+ info.play.precision = 8;
+ break;
+ case AUDIO_S16LSB:
+ info.play.encoding = AUDIO_ENCODING_SLINEAR_LE;
+ info.play.precision = 16;
+ break;
+ case AUDIO_S16MSB:
+ info.play.encoding = AUDIO_ENCODING_SLINEAR_BE;
+ info.play.precision = 16;
+ break;
+ case AUDIO_U16LSB:
+ info.play.encoding = AUDIO_ENCODING_ULINEAR_LE;
+ info.play.precision = 16;
+ break;
+ case AUDIO_U16MSB:
+ info.play.encoding = AUDIO_ENCODING_ULINEAR_BE;
+ info.play.precision = 16;
+ break;
+ default:
+ continue;
+ }
+ if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0)
+ break;
+ }
+
+ if(!format) {
+ SDL_SetError("No supported encoding for 0x%x", spec->format);
+ return(-1);
+ }
+
+ spec->format = format;
+
+ AUDIO_INITINFO(&info);
+ info.play.channels = spec->channels;
+ if (ioctl(audio_fd, AUDIO_SETINFO, &info) == -1)
+ spec->channels = 1;
+ AUDIO_INITINFO(&info);
+ info.play.sample_rate = spec->freq;
+ info.blocksize = spec->size;
+ info.hiwat = 5;
+ info.lowat = 3;
+ (void)ioctl(audio_fd, AUDIO_SETINFO, &info);
+ (void)ioctl(audio_fd, AUDIO_GETINFO, &info);
+ spec->freq = info.play.sample_rate;
+ /* Allocate mixing buffer */
+ mixlen = spec->size;
+ mixbuf = (Uint8*)SDL_AllocAudioMem(mixlen);
+ if(mixbuf == NULL) {
+ return(-1);
+ }
+ SDL_memset(mixbuf, spec->silence, spec->size);
+
+ /* Get the parent process id (we're the parent of the audio thread) */
+ parent = getpid();
+
+#ifdef DEBUG_AUDIO
+ OBSD_Status(this);
+#endif
+
+ /* We're ready to rock and roll. :-) */
+ return(0);
+}
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