Why does PA need to rewrite and rewind when I change the volume while playing audio?

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Hi guys,

I found the following logic when I change the volume while playing audio.I guess there is some audio expertise here, would you please tell me the principle, thanks a lot!

In the file sink-input.c(./src/pulsecore/sink-input.c), why does pa need to invoke the function pa_sink_input_request_rewind to rewrite and rewind the data?

void pa_sink_input_set_volume(...) {

pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_SOFT_VOLUME, NULL, 0, NULL) == 0);


int pa_sink_input_process_msg(...) {

    switch (code) {

if (!pa_cvolume_equal(&i->thread_info.soft_volume, &i->soft_volume)) {
                i->thread_info.soft_volume = i->soft_volume;
                pa_sink_input_request_rewind(i, 0, true, false, false);

           return 0;


Best Regards,

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