core: add functions to query max_rewind/max_request values from streams

src/pulsecore/sink-input.c

@@ -802,6 +802,25 @@ void pa_sink_input_process_rewind(pa_sink_input *i, size_t nbytes /* in sink sam
     i->thread_info.dont_rewind_render = FALSE;
 }
 
+/* Called from thread context */
+size_t pa_sink_input_get_max_rewind(pa_sink_input *i) {
+    pa_sink_input_assert_ref(i);
+    pa_sink_input_assert_io_context(i);
+
+    return i->thread_info.resampler ? pa_resampler_request(i->thread_info.resampler, i->sink->thread_info.max_rewind) : i->sink->thread_info.max_rewind;
+}
+
+/* Called from thread context */
+size_t pa_sink_input_get_max_request(pa_sink_input *i) {
+    pa_sink_input_assert_ref(i);
+    pa_sink_input_assert_io_context(i);
+
+    /* We're not verifying the status here, to allow this to be called
+     * in the state change handler between _INIT and _RUNNING */
+
+    return i->thread_info.resampler ? pa_resampler_request(i->thread_info.resampler, i->sink->thread_info.max_request) : i->sink->thread_info.max_request;
+}
+
 /* Called from thread context */
 void pa_sink_input_update_max_rewind(pa_sink_input *i, size_t nbytes  /* in the sink's sample spec */) {
     pa_sink_input_assert_ref(i);

src/pulsecore/sink-input.h

@@ -303,6 +303,10 @@ void pa_sink_input_cork(pa_sink_input *i, pa_bool_t b);
 
 int pa_sink_input_set_rate(pa_sink_input *i, uint32_t rate);
 
+/* This returns the sink's fields converted into out sample type */
+size_t pa_sink_input_get_max_rewind(pa_sink_input *i);
+size_t pa_sink_input_get_max_request(pa_sink_input *i);
+
 /* Callable by everyone from main thread*/
 
 /* External code may request disconnection with this function */

src/pulsecore/source-output.c

@@ -536,6 +536,14 @@ void pa_source_output_process_rewind(pa_source_output *o, size_t nbytes /* in so
         pa_memblockq_rewind(o->thread_info.delay_memblockq, nbytes);
 }
 
+/* Called from thread context */
+size_t pa_source_output_get_max_rewind(pa_source_output *o) {
+    pa_source_output_assert_ref(o);
+    pa_source_output_assert_io_context(o);
+
+    return o->thread_info.resampler ? pa_resampler_request(o->thread_info.resampler, o->source->thread_info.max_rewind) : o->source->thread_info.max_rewind;
+}
+
 /* Called from thread context */
 void pa_source_output_update_max_rewind(pa_source_output *o, size_t nbytes  /* in the source's sample spec */) {
     pa_source_output_assert_ref(o);

src/pulsecore/source-output.h

@@ -238,6 +238,8 @@ void pa_source_output_cork(pa_source_output *o, pa_bool_t b);
 
 int pa_source_output_set_rate(pa_source_output *o, uint32_t rate);
 
+size_t pa_source_output_get_max_rewind(pa_source_output *o);
+
 /* Callable by everyone */
 
 /* External code may request disconnection with this funcion */