src/audio/bsd/SDL_bsdaudio.c
changeset 2049 5f6550e5184f
parent 1982 3b4ce57c6215
child 2060 866052b01ee5
--- a/src/audio/bsd/SDL_bsdaudio.c	Sun Oct 01 16:10:41 2006 +0000
+++ b/src/audio/bsd/SDL_bsdaudio.c	Tue Oct 17 09:15:21 2006 +0000
@@ -61,195 +61,91 @@
 /* #define DEBUG_AUDIO_STREAM */
 
 #ifdef USE_BLOCKING_WRITES
-#define OPEN_FLAGS	O_WRONLY
+#define OPEN_FLAGS_OUTPUT O_WRONLY
+#define OPEN_FLAGS_INPUT O_RDONLY
 #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);
+#define OPEN_FLAGS_OUTPUT (O_WRONLY|O_NONBLOCK)
+#define OPEN_FLAGS_INPUT (O_RDONLY|O_NONBLOCK)
 #endif
 
-/* Audio driver bootstrap functions */
-
-static int
-Audio_Available(void)
-{
-    int fd;
-    int available;
+/* !!! FIXME: so much cut and paste with dsp/dma drivers... */
+static char **outputDevices = NULL;
+static int outputDeviceCount = 0;
+static char **inputDevices = NULL;
+static int inputDeviceCount = 0;
 
-    available = 0;
-    fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
-    if (fd >= 0) {
-        available = 1;
-        close(fd);
-    }
-    return (available);
+static inline void
+free_device_list(char ***devs, int *count)
+{
+    SDL_FreeUnixAudioDevices(devs, count);
 }
 
-static void
-Audio_DeleteDevice(SDL_AudioDevice * device)
+static inline void
+build_device_list(int iscapture, char ***devs, int *count)
 {
-    SDL_free(device->hidden);
-    SDL_free(device);
+    const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT);
+    free_device_list(devs, count);
+    SDL_EnumUnixAudioDevices(flags, 0, NULL, devs, count);
 }
 
-static SDL_AudioDevice *
-Audio_CreateDevice(int devindex)
+static inline void
+build_device_lists(void)
 {
-    SDL_AudioDevice *this;
+    build_device_list(0, &outputDevices, &outputDeviceCount);
+    build_device_list(1, &inputDevices, &inputDeviceCount);
+}
 
-    /* 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;
+static inline void
+free_device_lists(void)
+{
+    free_device_list(&outputDevices, &outputDeviceCount);
+    free_device_list(&inputDevices, &inputDeviceCount);
 }
 
-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)
+BSDAUDIO_Deinitialize(void)
 {
-    int written, p = 0;
+    free_device_lists();
+}
+
 
-    /* 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;
+static int
+BSDAUDIO_DetectDevices(int iscapture)
+{
+    if (iscapture) {
+        build_device_list(1, &inputDevices, &inputDeviceCount);
+        return inputDeviceCount;
+    } else {
+        build_device_list(0, &outputDevices, &outputDeviceCount);
+        return outputDeviceCount;
     }
 
-    /* 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
+    return 0;  /* shouldn't ever hit this. */
 }
 
-static Uint8 *
-OBSD_GetAudioBuf(_THIS)
+static const char *
+BSDAUDIO_GetDeviceName(int index, int iscapture)
 {
-    return (mixbuf);
+    if ((iscapture) && (index < inputDeviceCount)) {
+        return inputDevices[index];
+    } else if ((!iscapture) && (index < outputDeviceCount)) {
+        return outputDevices[index];
+    }
+
+    SDL_SetError("No such device");
+    return NULL;
 }
 
+
 static void
-OBSD_CloseAudio(_THIS)
+BSDAUDIO_Status(_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) {
+    if (ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) {
         fprintf(stderr, "AUDIO_GETINFO failed.\n");
         return;
     }
@@ -269,46 +165,18 @@
             "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");
+            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"
@@ -324,42 +192,170 @@
             (info.mode == AUMODE_PLAY) ? "PLAY"
             : (info.mode = AUMODE_RECORD) ? "RECORD"
             : (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL" : "?"));
+#endif /* DEBUG_AUDIO */
 }
-#endif /* DEBUG_AUDIO */
+
+
+/* This function waits until it is possible to write a full sound buffer */
+static void
+BSDAUDIO_WaitDevice(_THIS)
+{
+#ifndef USE_BLOCKING_WRITES     /* Not necessary when using blocking writes */
+    /* See if we need to use timed audio synchronization */
+    if (this->hidden->frame_ticks) {
+        /* Use timer for general audio synchronization */
+        Sint32 ticks;
+
+        ticks = ((Sint32)(this->hidden->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(this->hidden->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(this->hidden->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 */
+            this->hidden->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
+BSDAUDIO_PlayDevice(_THIS)
+{
+    int written, p = 0;
+
+    /* Write the audio data, checking for EAGAIN on broken audio drivers */
+    do {
+        written = write(this->hidden->audio_fd,
+                        &this->hidden->mixbuf[p],
+                        this->hidden->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 (this->hidden->frame_ticks) {
+        this->hidden->next_frame += this->hidden->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 *
+BSDAUDIO_GetDeviceBuf(_THIS)
+{
+    return (this->hidden->mixbuf);
+}
+
+static void
+BSDAUDIO_CloseDevice(_THIS)
+{
+    if (this->hidden != NULL) {
+        if (this->hidden->mixbuf != NULL) {
+            SDL_FreeAudioMem(this->hidden->mixbuf);
+            this->hidden->mixbuf = NULL;
+        }
+        if (this->hidden->audio_fd >= 0) {
+            close(this->hidden->audio_fd);
+            this->hidden->audio_fd = -1;
+        }
+        SDL_free(this->hidden);
+        this->hidden = NULL;
+    }
+}
 
 static int
-OBSD_OpenAudio(_THIS, SDL_AudioSpec * spec)
+BSDAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
 {
-    char audiodev[64];
-    SDL_AudioFormat format;
+    const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT);
+    SDL_AudioFormat format = 0;
     audio_info_t info;
 
+    /* We don't care what the devname is...we'll try to open anything. */
+    /*  ...but default to first name in the list... */
+    if (devname == NULL) {
+        if ( ((iscapture) && (inputDeviceCount == 0)) ||
+             ((!iscapture) && (outputDeviceCount == 0)) ) {
+            SDL_SetError("No such audio device");
+            return 0;
+        }
+        devname = ((iscapture) ? inputDevices[0] : outputDevices[0]);
+    }
+
+    /* Initialize all variables that we clean on shutdown */
+    this->hidden = (struct SDL_PrivateAudioData *)
+                        SDL_malloc((sizeof *this->hidden));
+    if (this->hidden == NULL) {
+        SDL_OutOfMemory();
+        return 0;
+    }
+    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
+
+    /* Open the audio device */
+    this->hidden->audio_fd = open(devname, flags, 0);
+    if (this->hidden->audio_fd < 0) {
+        SDL_SetError("Couldn't open %s: %s", devname, strerror(errno));
+        return 0;
+    }
+
     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);
-    }
+    SDL_CalculateAudioSpec(&this->spec);
 
     /* Set to play mode */
     info.mode = AUMODE_PLAY;
-    if (ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) {
+    if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) < 0) {
+        BSDAUDIO_CloseDevice(this);
         SDL_SetError("Couldn't put device into play mode");
-        return (-1);
+        return 0;
     }
 
-    mixbuf = NULL;
     AUDIO_INITINFO(&info);
-    for (format = SDL_FirstAudioFormat(spec->format);
+    for (format = SDL_FirstAudioFormat(this->spec.format);
          format; format = SDL_NextAudioFormat()) {
         switch (format) {
         case AUDIO_U8:
@@ -389,46 +385,69 @@
         default:
             continue;
         }
-        if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0)
+
+        if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) == 0) {
             break;
+        }
     }
 
     if (!format) {
-        SDL_SetError("No supported encoding for 0x%x", spec->format);
-        return (-1);
+        BSDAUDIO_CloseDevice(this);
+        SDL_SetError("No supported encoding for 0x%x", this->spec.format);
+        return 0;
     }
 
-    spec->format = format;
+    this->spec.format = format;
 
     AUDIO_INITINFO(&info);
-    info.play.channels = spec->channels;
-    if (ioctl(audio_fd, AUDIO_SETINFO, &info) == -1)
-        spec->channels = 1;
+    info.play.channels = this->spec.channels;
+    if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) == -1) {
+        this->spec.channels = 1;
+    }
     AUDIO_INITINFO(&info);
-    info.play.sample_rate = spec->freq;
-    info.blocksize = spec->size;
+    info.play.sample_rate = this->spec.freq;
+    info.blocksize = this->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(this->hidden->audio_fd, AUDIO_SETINFO, &info);
+    (void) ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info);
+    this->spec.freq = info.play.sample_rate;
     /* Allocate mixing buffer */
-    mixlen = spec->size;
-    mixbuf = (Uint8 *) SDL_AllocAudioMem(mixlen);
-    if (mixbuf == NULL) {
-        return (-1);
+    this->hidden->mixlen = this->spec.size;
+    this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
+    if (this->hidden->mixbuf == NULL) {
+        BSDAUDIO_CloseDevice(this);
+        SDL_OutOfMemory();
+        return 0;
     }
-    SDL_memset(mixbuf, spec->silence, spec->size);
+    SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
 
-    /* Get the parent process id (we're the parent of the audio thread) */
-    parent = getpid();
-
-#ifdef DEBUG_AUDIO
-    OBSD_Status(this);
-#endif
+    BSDAUDIO_Status(this);
 
     /* We're ready to rock and roll. :-) */
     return (0);
 }
 
+static int
+BSDAUDIO_Init(SDL_AudioDriverImpl *impl)
+{
+    /* Set the function pointers */
+    impl->DetectDevices = BSDAUDIO_DetectDevices;
+    impl->GetDeviceName = BSDAUDIO_GetDeviceName;
+    impl->OpenDevice = BSDAUDIO_OpenDevice;
+    impl->PlayDevice = BSDAUDIO_PlayDevice;
+    impl->WaitDevice = BSDAUDIO_WaitDevice;
+    impl->GetDeviceBuf = BSDAUDIO_GetDeviceBuf;
+    impl->CloseDevice = BSDAUDIO_CloseDevice;
+    impl->Deinitialize = BSDAUDIO_Deinitialize;
+
+    build_device_lists();
+    return 1;
+}
+
+
+AudioBootStrap BSD_AUDIO_bootstrap = {
+    BSD_AUDIO_DRIVER_NAME, BSD_AUDIO_DRIVER_DESC, BSDAUDIO_Init, 0
+};
+
 /* vi: set ts=4 sw=4 expandtab: */