From 6c329bb505e05a28e85edda713d20a58ea50008b Mon Sep 17 00:00:00 2001
From: freeforf <zr200307@163.com>
Date: Tue, 10 Dec 2024 19:03:50 +0800
Subject: [PATCH] Fixed alsa dev read pcm bug

---
 pjmedia/src/pjmedia-audiodev/alsa_dev.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/pjmedia/src/pjmedia-audiodev/alsa_dev.c b/pjmedia/src/pjmedia-audiodev/alsa_dev.c
index fd868bd06e..467390063e 100755
--- a/pjmedia/src/pjmedia-audiodev/alsa_dev.c
+++ b/pjmedia/src/pjmedia-audiodev/alsa_dev.c
@@ -610,7 +610,20 @@ static int ca_thread_func (void *arg)
 
     while (!stream->quit) {
         pjmedia_frame frame;
-
+        
+        snd_pcm_state_t state;
+        state = snd_pcm_state(pcm);
+        if (state == SND_PCM_STATE_PREPARED) {
+            snd_pcm_start(pcm);
+            contine;
+        } else if (state == SND_PCM_STATE_RUNNING) {
+            snd_pcm_uframes_t avail;
+            avail = snd_pcm_avail(pcm);
+            if (avail >= 0 && avail < nframes) {
+                pj_thread_sleep(5);
+                continue;
+            }
+        }
         pj_bzero (buf, size);
         result = snd_pcm_readi (pcm, buf, nframes);
         if (result == -EPIPE) {