dfsound: add PulseAudio workaround

1 files changed, 51 insertions, 12 deletions

diff --git a/plugins/dfsound/alsa.c b/plugins/dfsound/alsa.c
index 58900cc..1c02d37 100644
--- a/plugins/dfsound/alsa.c
+++ b/plugins/dfsound/alsa.c
@@ -24,24 +24,58 @@
 static snd_pcm_t *handle = NULL;
 static snd_pcm_uframes_t buffer_size;
 
+static void alsa_finish(void);
+
 // SETUP SOUND
 static int alsa_init(void)
 {
  snd_pcm_hw_params_t *hwparams;
  snd_pcm_status_t *status;
+ snd_ctl_t *ctl_handle = NULL;
+ snd_ctl_card_info_t *info;
  unsigned int pspeed;
  int pchannels;
  int format;
  unsigned int buffer_time = 100000;
  unsigned int period_time = buffer_time / 4;
+ const char *alsa_name = "default";
+ const char *name;
+ int retval = -1;
  int err;
 
+ name = getenv("ALSA_NAME");
+ if (name != NULL)
+  alsa_name = name;
+
+ snd_ctl_card_info_alloca(&info);
+ if ((err = snd_ctl_open(&ctl_handle, alsa_name, 0)) < 0) {
+  printf("control open: %s\n", snd_strerror(err));
+ }
+ else if ((err = snd_ctl_card_info(ctl_handle, info)) < 0) {
+  printf("control info: %s\n", snd_strerror(err));
+  snd_ctl_card_info_clear(info);
+ }
+ if (ctl_handle != NULL)
+  snd_ctl_close(ctl_handle);
+
+ name = snd_ctl_card_info_get_name(info);
+ if (name != NULL) {
+  if (strcasecmp(name, "PulseAudio") == 0) {
+    // PulseAudio's ALSA emulation is known to be broken..
+    printf("alsa: refusing to run under PulseAudio's emulation\n");
+    return -1;
+  }
+  else {
+    printf("alsa: using '%s', set ALSA_NAME to change\n", name);
+  }
+ }
+
  pchannels=2;
 
  pspeed = 44100;
  format = SND_PCM_FORMAT_S16;
 
- if ((err = snd_pcm_open(&handle, "default", 
+ if ((err = snd_pcm_open(&handle, alsa_name, 
                       SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0)
   {
    printf("Audio open error: %s\n", snd_strerror(err));
@@ -51,7 +85,7 @@ static int alsa_init(void)
  if((err = snd_pcm_nonblock(handle, 0))<0)
   {
    printf("Can't set blocking moded: %s\n", snd_strerror(err));
-   return -1;
+   goto out;
   }
 
  snd_pcm_hw_params_alloca(&hwparams);
@@ -59,60 +93,65 @@ static int alsa_init(void)
  if((err=snd_pcm_hw_params_any(handle, hwparams))<0)
   {
    printf("Broken configuration for this PCM: %s\n", snd_strerror(err));
-   return -1;
+   goto out;
   }
 
  if((err=snd_pcm_hw_params_set_access(handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED))<0)
   {
    printf("Access type not available: %s\n", snd_strerror(err));
-   return -1;
+   goto out;
   }
 
  if((err=snd_pcm_hw_params_set_format(handle, hwparams, format))<0)
   {
    printf("Sample format not available: %s\n", snd_strerror(err));
-   return -1;
+   goto out;
   }
 
  if((err=snd_pcm_hw_params_set_channels(handle, hwparams, pchannels))<0)
   {
    printf("Channels count not available: %s\n", snd_strerror(err));
-   return -1;
+   goto out;
   }
 
  if((err=snd_pcm_hw_params_set_rate_near(handle, hwparams, &pspeed, 0))<0)
   {
    printf("Rate not available: %s\n", snd_strerror(err));
-   return -1;
+   goto out;
   }
 
  if((err=snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, 0))<0)
   {
    printf("Buffer time error: %s\n", snd_strerror(err));
-   return -1;
+   goto out;
   }
 
  if((err=snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, 0))<0)
   {
    printf("Period time error: %s\n", snd_strerror(err));
-   return -1;
+   goto out;
   }
 
  if((err=snd_pcm_hw_params(handle, hwparams))<0)
   {
    printf("Unable to install hw params: %s\n", snd_strerror(err));
-   return -1;
+   goto out;
   }
 
  snd_pcm_status_alloca(&status);
  if((err=snd_pcm_status(handle, status))<0)
   {
    printf("Unable to get status: %s\n", snd_strerror(err));
-   return -1;
+   goto out;
   }
 
  buffer_size = snd_pcm_status_get_avail(status);
- return 0;
+ retval = 0;
+
+out:
+ if (retval != 0)
+  alsa_finish();
+ return retval;
 }
 
 // REMOVE SOUND