From b2101352b6dada91ec09aae455e6bc8a662b1895 Mon Sep 17 00:00:00 2001
From: e_kumalija <e_kumalija@toa.co.jp>
Date: Fri, 14 Oct 2022 13:20:25 +0900
Subject: [PATCH] log xrun trigger

---
 include/error.h    | 17 +++++++++++++++++
 src/pcm/pcm_dmix.c |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/include/error.h b/include/error.h
index 7239db85..b5d222a1 100644
--- a/include/error.h
+++ b/include/error.h
@@ -74,6 +74,23 @@ extern int snd_lib_error_set_handler(snd_lib_error_handler_t handler);
 }
 #endif
 
+#define ALSALIB_LOG_FILE "/var/log/alsa_log.txt"
+
+//append log to existing file
+#define alsaLib_log_write(fmt, ...) { \
+	FILE *fp = fopen(ALSALIB_LOG_FILE,"a"); \
+	if(fp){ \
+		time_t time_sec; \
+		unsigned long time_ms; \
+		struct timespec now; \
+		clock_gettime(CLOCK_MONOTONIC,&now); \
+		time_sec = now.tv_sec; \
+		time_ms  = now.tv_nsec/1000000; \
+		fprintf(fp,"%lu.%03lu," fmt, time_sec, time_ms, ##__VA_ARGS__); \
+		fclose(fp); \
+	} \
+}
+
 /** Local error handler function type */
 typedef void (*snd_local_error_handler_t)(const char *file, int line,
 					  const char *func, int err,
diff --git a/src/pcm/pcm_dmix.c b/src/pcm/pcm_dmix.c
index d533f40c..d8e76c8e 100644
--- a/src/pcm/pcm_dmix.c
+++ b/src/pcm/pcm_dmix.c
@@ -44,6 +44,7 @@
 #include <sys/un.h>
 #include <sys/mman.h>
 #include "pcm_direct.h"
+#include "error.h"
 
 #ifndef PIC
 /* entry for static linking */
@@ -422,6 +423,7 @@ static int snd_pcm_dmix_sync_ptr0(snd_pcm_t *pcm, snd_pcm_uframes_t slave_hw_ptr
 		gettimestamp(&dmix->trigger_tstamp, pcm->tstamp_type);
 		if (dmix->state == SND_PCM_STATE_RUNNING) {
 			dmix->state = SND_PCM_STATE_XRUN;
+			alsaLib_log_write("Xrun avail size =%lu stop_threshold=%lu",avail,pcm->stop_threshold);
 			return -EPIPE;
 		}
 		dmix->state = SND_PCM_STATE_SETUP;