Mercurial > sdl-ios-xcode

diff src/audio/bsd/SDL_bsdaudio.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 95451df282c3
children 4da1ee79c9af
line wrap: on
line diff
--- a/src/audio/bsd/SDL_bsdaudio.c	Sun May 21 17:27:13 2006 +0000
+++ b/src/audio/bsd/SDL_bsdaudio.c	Sun May 28 13:04:16 2006 +0000
@@ -67,58 +67,59 @@
 #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);
+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);
+static void OBSD_Status (_THIS);
 #endif
 
 /* Audio driver bootstrap functions */
 
 static int
-Audio_Available(void)
+Audio_Available (void)
 {
     int fd;
     int available;
 
     available = 0;
-    fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
-    if(fd >= 0) {
-	available = 1;
-	close(fd);
+    fd = SDL_OpenAudioPath (NULL, 0, OPEN_FLAGS, 0);
+    if (fd >= 0) {
+        available = 1;
+        close (fd);
     }
-    return(available);
+    return (available);
 }
 
 static void
-Audio_DeleteDevice(SDL_AudioDevice *device)
+Audio_DeleteDevice (SDL_AudioDevice * device)
 {
-    SDL_free(device->hidden);
-    SDL_free(device);
+    SDL_free (device->hidden);
+    SDL_free (device);
 }
 
-static SDL_AudioDevice
-*Audio_CreateDevice(int devindex)
+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));
+    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);
+    if ((this == NULL) || (this->hidden == NULL)) {
+        SDL_OutOfMemory ();
+        if (this)
+            SDL_free (this);
+        return (0);
     }
-    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
+    SDL_memset (this->hidden, 0, (sizeof *this->hidden));
     audio_fd = -1;
 
     /* Set the function pointers */
@@ -129,276 +130,305 @@
     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
+    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)
+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;
+#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;
+        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;
+        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");
+        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;
+        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");
+            fprintf (stderr, "Done disabling audio\n");
 #endif
-		}
+        }
 #ifdef DEBUG_AUDIO
-		fprintf(stderr, "Ready!\n");
+        fprintf (stderr, "Ready!\n");
 #endif
-	}
+    }
 #endif /* !USE_BLOCKING_WRITES */
 }
 
 static void
-OBSD_PlayAudio(_THIS)
+OBSD_PlayAudio (_THIS)
 {
-	int written, p=0;
+    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;
-		}
+    /* 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 (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 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;
-	}
+    /* 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);
+    fprintf (stderr, "Wrote %d bytes of audio data\n", written);
 #endif
 }
 
-static Uint8
-*OBSD_GetAudioBuf(_THIS)
+static Uint8 *
+OBSD_GetAudioBuf (_THIS)
 {
-    return(mixbuf);
+    return (mixbuf);
 }
 
 static void
-OBSD_CloseAudio(_THIS)
+OBSD_CloseAudio (_THIS)
 {
-    if(mixbuf != NULL) {
-	SDL_FreeAudioMem(mixbuf);
-	mixbuf = NULL;
+    if (mixbuf != NULL) {
+        SDL_FreeAudioMem (mixbuf);
+        mixbuf = NULL;
     }
-    if(audio_fd >= 0) {
-	close(audio_fd);
-	audio_fd = -1;
+    if (audio_fd >= 0) {
+        close (audio_fd);
+        audio_fd = -1;
     }
 }
 
 #ifdef DEBUG_AUDIO
 void
-OBSD_Status(_THIS)
+OBSD_Status (_THIS)
 {
     audio_info_t info;
 
-    if(ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
-	fprintf(stderr,"AUDIO_GETINFO failed.\n");
-	return;
+    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"
+             "[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"
-    : "?"));
+    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)
+OBSD_OpenAudio (_THIS, SDL_AudioSpec * spec)
 {
     char audiodev[64];
     Uint16 format;
     audio_info_t info;
 
-    AUDIO_INITINFO(&info);
-    
+    AUDIO_INITINFO (&info);
+
     /* Calculate the final parameters for this audio specification */
-    SDL_CalculateAudioSpec(spec);
+    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);
+    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 (ioctl (audio_fd, AUDIO_SETINFO, &info) < 0) {
+        SDL_SetError ("Couldn't put device into play mode");
+        return (-1);
     }
 
-    if(!format) {
-	SDL_SetError("No supported encoding for 0x%x", spec->format);
-	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);
+    AUDIO_INITINFO (&info);
     info.play.channels = spec->channels;
-    if (ioctl(audio_fd, AUDIO_SETINFO, &info) == -1)
-    	spec->channels = 1;
-    AUDIO_INITINFO(&info);
+    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;
+    (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);
+    mixbuf = (Uint8 *) SDL_AllocAudioMem (mixlen);
+    if (mixbuf == NULL) {
+        return (-1);
     }
-    SDL_memset(mixbuf, spec->silence, spec->size);
-    
+    SDL_memset (mixbuf, spec->silence, spec->size);
+
     /* Get the parent process id (we're the parent of the audio thread) */
-    parent = getpid();
+    parent = getpid ();
 
 #ifdef DEBUG_AUDIO
-    OBSD_Status(this);
+    OBSD_Status (this);
 #endif
 
     /* We're ready to rock and roll. :-) */
-    return(0);
+    return (0);
 }
+
+/* vi: set ts=4 sw=4 expandtab: */