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</o:shapelayout></xml><![endif]--></head><body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal><span lang=EN-US>I got buffer underruns when moving sinks for a “live” stream. Flag “adjust_latency” will decrease the latency each time when I move the sink and can cause buffer underrun.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><a href="http://lists.freedesktop.org/archives/pulseaudio-discuss/2011-June/010146.html">http://lists.freedesktop.org/archives/pulseaudio-discuss/2011-June/010146.html</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Is it OK to set a minimum total latency (300ms) for a “live” (phone) playback stream, considering that a BT headset sink has a fixed latency of 128ms?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Amanda<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>diff --git a/pulseaudio-0.9.22/src/pulsecore/protocol-native.c b/pulseaudio-0.9.22/src/pulsecore/protocol-native.c<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>index 4952ee4..570a0c7 100755<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>--- a/pulseaudio-0.9.22/src/pulsecore/protocol-native.c<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+++ b/pulseaudio-0.9.22/src/pulsecore/protocol-native.c<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>@@ -856,6 +856,8 @@ static int playback_stream_process_msg(pa_msgobject *o, int code, void*userdata,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> /* Called from main context */<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+#define MIN_PHONE_TOTAL_LATENCY_USEC 300000<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> static void fix_playback_buffer_attr(playback_stream *s) {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> size_t frame_size, max_prebuf;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> pa_usec_t orig_tlength_usec, tlength_usec, orig_minreq_usec, minreq_usec, sink_usec;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>@@ -933,6 +935,13 @@ static void fix_playback_buffer_attr(playback_stream *s) {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> * able to fulfill it and give the application also minreq<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> * time to fill it up again for the next request Makes 2 times<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> * minreq in plus.. */<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+ const char *role;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+ role = pa_proplist_gets(s->sink_input->proplist, PA_PROP_MEDIA_ROLE);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+ if(role && pa_streq("phone", role)) {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+ if(tlength_usec < MIN_PHONE_TOTAL_LATENCY_USEC)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+ tlength_usec = MIN_PHONE_TOTAL_LATENCY_USEC;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+ }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> if (tlength_usec > minreq_usec*2)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> sink_usec = (tlength_usec - minreq_usec*2)/2;<o:p></o:p></span></p></div></body></html>