src/audio/bsd/SDL_bsdaudio.c
changeset 1567 12b6d331d82a
child 1583 95451df282c3
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/audio/bsd/SDL_bsdaudio.c	Tue Mar 21 09:33:54 2006 +0000
@@ -0,0 +1,404 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2004 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_openbsdaudio.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 OPENBSD_AUDIO_bootstrap = {
+	BSD_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);
+}