From 9e5b75366b8caa4886372be53c2e82f93a1da251 Mon Sep 17 00:00:00 2001
From: John Melton - G0ORX/N6LYT <john.d.melton@googlemail.com>
Date: Mon, 19 Dec 2016 12:12:52 +0000
Subject: [PATCH] added check on output buffer size to trim output samples to
keep sync.
---
audio.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/audio.c b/audio.c
index fc73794..b46ab8a 100644
--- a/audio.c
+++ b/audio.c
@@ -281,7 +281,9 @@ void audio_close_input() {
}
int audio_write(short left_sample,short right_sample) {
+ snd_pcm_sframes_t delay;
int error;
+ long trim;
if(playback_handle!=NULL && audio_buffer!=NULL) {
audio_buffer[audio_offset++]=left_sample;
@@ -291,7 +293,16 @@ int audio_write(short left_sample,short right_sample) {
if(audio_offset==AUDIO_BUFFER_SIZE) {
- if ((error = snd_pcm_writei (playback_handle, audio_buffer, audio_buffer_size)) != audio_buffer_size) {
+ trim=0;
+
+ if(snd_pcm_delay(playback_handle,&delay)==0) {
+ if(delay>2048) {
+ trim=delay-2048;
+fprintf(stderr,"audio delay=%ld trim=%ld\n",delay,trim);
+ }
+ }
+
+ if ((error = snd_pcm_writei (playback_handle, audio_buffer, audio_buffer_size-trim)) != audio_buffer_size-trim) {
if(error==-EPIPE) {
if ((error = snd_pcm_prepare (playback_handle)) < 0) {
fprintf (stderr, "audio_write: cannot prepare audio interface for use (%s)\n",
--
2.45.2