From 2d461379efa454e68982dbbcab3add0627d777c8 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Wed, 19 Nov 2008 09:01:03 -0800
Subject: Handle ALSA capture errors a bit better

---
 Alc/alsa.c | 44 +++++++++++++++++++++++++++++++++++---------
 1 file changed, 35 insertions(+), 9 deletions(-)

diff --git a/Alc/alsa.c b/Alc/alsa.c
index 14450a95..27e43e53 100644
--- a/Alc/alsa.c
+++ b/Alc/alsa.c
@@ -724,9 +724,8 @@ static void alsa_close_capture(ALCdevice *pDevice)
 static void alsa_start_capture(ALCdevice *pDevice)
 {
     alsa_data *data = (alsa_data*)pDevice->ExtraData;
-    if(data->thread)
-        data->doCapture = 1;
-    else
+    data->doCapture = 1;
+    if(!data->thread)
     {
         psnd_pcm_prepare(data->pcmHandle);
         psnd_pcm_start(data->pcmHandle);
@@ -736,9 +735,8 @@ static void alsa_start_capture(ALCdevice *pDevice)
 static void alsa_stop_capture(ALCdevice *pDevice)
 {
     alsa_data *data = (alsa_data*)pDevice->ExtraData;
-    if(data->thread)
-        data->doCapture = 0;
-    else
+    data->doCapture = 0;
+    if(!data->thread)
         psnd_pcm_drain(data->pcmHandle);
 }
 
@@ -748,6 +746,7 @@ static void alsa_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint l
     const snd_pcm_channel_area_t *areas = NULL;
     snd_pcm_sframes_t frames, commitres;
     snd_pcm_uframes_t size, offset;
+    snd_pcm_state_t state;
     int err;
 
     if(data->thread)
@@ -759,6 +758,17 @@ static void alsa_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint l
         return;
     }
 
+    state = psnd_pcm_state(data->pcmHandle);
+    if(state == SND_PCM_STATE_XRUN)
+    {
+        err = xrun_recovery(data->pcmHandle, -EPIPE);
+        if(err < 0)
+        {
+            AL_PRINT("XRUN recovery failed: %s\n", psnd_strerror(err));
+            return;
+        }
+    }
+
     frames = psnd_pcm_avail_update(data->pcmHandle);
     if(frames < 0)
     {
@@ -815,20 +825,36 @@ static ALCuint alsa_available_samples(ALCdevice *pDevice)
 {
     alsa_data *data = (alsa_data*)pDevice->ExtraData;
     snd_pcm_sframes_t frames;
+    snd_pcm_state_t state;
+    int err;
 
     if(data->thread)
         return RingBufferSize(data->ring);
 
+    state = psnd_pcm_state(data->pcmHandle);
+    if(state == SND_PCM_STATE_XRUN)
+    {
+        err = xrun_recovery(data->pcmHandle, -EPIPE);
+        if(err >= 0)
+        {
+            if(data->doCapture)
+                err = psnd_pcm_start(data->pcmHandle);
+        }
+        if (err < 0)
+        {
+            AL_PRINT("XRUN recovery failed: %s\n", psnd_strerror(err));
+            return 0;
+        }
+    }
+
     frames = psnd_pcm_avail_update(data->pcmHandle);
     if(frames < 0)
     {
-        int err = xrun_recovery(data->pcmHandle, frames);
+        err = xrun_recovery(data->pcmHandle, frames);
         if (err < 0)
             AL_PRINT("available update failed: %s\n", psnd_strerror(err));
         else
             frames = psnd_pcm_avail_update(data->pcmHandle);
-        if(frames < 0) /* ew.. */
-            SetALCError(ALC_INVALID_DEVICE);
     }
     return max(frames, 0);
 }
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