Tanu,
I have modified code like this in module-combine-sink.c after exchanging idea with you.
In function sink_input_pop_cb(): add these lines before calling request_memblock()
...
if (o->just_attached) {
pa_usec_t sink_input_latency, sink_latency, total_latency1, total_latency2;
struct output *j;
sink_input_latency = pa_sink_input_get_latency_within_thread(i, &sink_latency);
sink_input_latency += sink_latency;
total_latency1 = sink_input_latency + pa_bytes_to_usec(pa_memblockq_get_length(o->memblockq), &o->sink_input->sample_spec);
pa_log_warn("[%s] latency %0.2fms, output buffer latency %0.2fms.", o->sink_input->sink->name, (double)total_latency1/PA_USEC_PER_MSEC, (double)(total_latency1-sink_input_latency)/PA_USEC_PER_MSEC);
/* OK, let's send this data to the other threads */
PA_LLIST_FOREACH(j, o->userdata->thread_info.active_outputs) {
if (j != o) {
sink_input_latency = pa_sink_input_get_latency_within_thread(j->sink_input, &sink_latency);
sink_input_latency += sink_latency;
total_latency2 = sink_input_latency + pa_bytes_to_usec(pa_memblockq_get_length(j->memblockq), &j->sink_input->sample_spec);
pa_log_warn("Peer: [%s] latency %0.2fms, output buffer latency %0.2fms.", j->sink_input->sink->name, (double)total_latency2/PA_USEC_PER_MSEC, (double)(total_latency2-sink_input_latency)/PA_USEC_PER_MSEC);
if (total_latency1 > total_latency2)
pa_memblockq_drop(o->memblockq, pa_usec_to_bytes(total_latency1-total_latency2, &o->sink_input->sample_spec));
else if (total_latency1 < total_latency2)
pa_memblockq_rewind(o->memblockq, pa_usec_to_bytes(total_latency2-total_latency1, &o->sink_input->sample_spec));
break;
}
}
o->just_attached = 0;
}
In function sink_input_attach_cb(): add o->just_attached = 1;
In function sink_input_detach_cb(): add o->just_attached = 0;
Then I got following logs when playing audio. Of course un-synchronization issue is still there.
W: [module-tunnel] module-combine-sink.c: [tunnel_sink] attached
W: [module-tunnel] module-combine-sink.c: [tunnel_sink] latency 0.00ms, output buffer latency 0.00ms.
W: [alsa-sink] module-combine-sink.c: [alsa_output] attached
W: [alsa-sink] module-combine-sink.c: [alsa_output] latency 0.88ms, output buffer latency 0.00ms.
W: [alsa-sink] module-combine-sink.c: Peer: [tunnel_sink] latency 0.00ms, output buffer latency 0.00ms.
W: [pulseaudio] module-combine-sink.c: [alsa_output] sample rates too different, not adjusting (44100 vs. 33380).
W: [pulseaudio] module-combine-sink.c: [alsa_output] sample rates too different, not adjusting (44100 vs. 28907).
W: [pulseaudio] module-combine-sink.c: [alsa_output] sample rates too different, not adjusting (44100 vs. 31788).
