X-Git-Url: https://code.delx.au/pulseaudio/blobdiff_plain/11dbe30bfae09235307115f413fb6172df04a895..2f7eb35f370bb79c12f229d109fc4dd2b74c9f47:/src/modules/module-loopback.c

diff --git a/src/modules/module-loopback.c b/src/modules/module-loopback.c
index dfd5e766..9a8640b1 100644
--- a/src/modules/module-loopback.c
+++ b/src/modules/module-loopback.c
@@ -57,7 +57,9 @@ PA_MODULE_USAGE(
         "sink_input_name=<custom name for the sink input> "
         "source_output_name=<custom name for the source output> "
         "sink_input_role=<media.role for the sink input> "
-        "source_output_role=<media.role for the source output>");
+        "source_output_role=<media.role for the source output> "
+        "source_dont_move=<boolean> "
+        "sink_dont_move=<boolean>");
 
 #define DEFAULT_LATENCY_MSEC 200
 
@@ -116,6 +118,8 @@ static const char* const valid_modargs[] = {
     "source_output_name",
     "sink_input_role",
     "source_output_role",
+    "source_dont_move",
+    "sink_dont_move",
     NULL,
 };
 
@@ -175,13 +179,13 @@ static void adjust_rates(struct userdata *u) {
 
     buffer_latency = pa_bytes_to_usec(buffer, &u->sink_input->sample_spec);
 
-    pa_log_info("Loopback overall latency is %0.2f ms + %0.2f ms + %0.2f ms = %0.2f ms",
+    pa_log_debug("Loopback overall latency is %0.2f ms + %0.2f ms + %0.2f ms = %0.2f ms",
                 (double) u->latency_snapshot.sink_latency / PA_USEC_PER_MSEC,
                 (double) buffer_latency / PA_USEC_PER_MSEC,
                 (double) u->latency_snapshot.source_latency / PA_USEC_PER_MSEC,
                 ((double) u->latency_snapshot.sink_latency + buffer_latency + u->latency_snapshot.source_latency) / PA_USEC_PER_MSEC);
 
-    pa_log_info("Should buffer %zu bytes, buffered at minimum %zu bytes",
+    pa_log_debug("Should buffer %zu bytes, buffered at minimum %zu bytes",
                 u->latency_snapshot.max_request*2,
                 u->latency_snapshot.min_memblockq_length);
 
@@ -194,9 +198,21 @@ static void adjust_rates(struct userdata *u) {
     else
         new_rate = base_rate + (((u->latency_snapshot.min_memblockq_length - u->latency_snapshot.max_request*2) / fs) *PA_USEC_PER_SEC)/u->adjust_time;
 
-    pa_log_info("Old rate %lu Hz, new rate %lu Hz", (unsigned long) old_rate, (unsigned long) new_rate);
+    if (new_rate < (uint32_t) (base_rate*0.8) || new_rate > (uint32_t) (base_rate*1.25)) {
+        pa_log_warn("Sample rates too different, not adjusting (%u vs. %u).", base_rate, new_rate);
+        new_rate = base_rate;
+    } else {
+        if (base_rate < new_rate + 20 && new_rate < base_rate + 20)
+          new_rate = base_rate;
+        /* Do the adjustment in small steps; 2‰ can be considered inaudible */
+        if (new_rate < (uint32_t) (old_rate*0.998) || new_rate > (uint32_t) (old_rate*1.002)) {
+            pa_log_info("New rate of %u Hz not within 2‰ of %u Hz, forcing smaller adjustment", new_rate, old_rate);
+            new_rate = PA_CLAMP(new_rate, (uint32_t) (old_rate*0.998), (uint32_t) (old_rate*1.002));
+        }
+    }
 
     pa_sink_input_set_rate(u->sink_input, new_rate);
+    pa_log_debug("[%s] Updated sampling rate to %lu Hz.", u->sink_input->sink->name, (unsigned long) new_rate);
 
     pa_core_rttime_restart(u->core, u->time_event, pa_rtclock_now() + u->adjust_time);
 }
@@ -421,9 +437,9 @@ static int sink_input_process_msg_cb(pa_msgobject *obj, int code, void *data, in
     switch (code) {
 
         case PA_SINK_INPUT_MESSAGE_GET_LATENCY: {
-             pa_usec_t *r = data;
+            pa_usec_t *r = data;
 
-             pa_sink_input_assert_io_context(u->sink_input);
+            pa_sink_input_assert_io_context(u->sink_input);
 
             *r = pa_bytes_to_usec(pa_memblockq_get_length(u->memblockq), &u->sink_input->sample_spec);
 
@@ -619,8 +635,10 @@ int pa__init(pa_module *m) {
     struct userdata *u;
     pa_sink *sink;
     pa_sink_input_new_data sink_input_data;
+    pa_bool_t sink_dont_move;
     pa_source *source;
     pa_source_output_new_data source_output_data;
+    pa_bool_t source_dont_move;
     uint32_t latency_msec;
     pa_sample_spec ss;
     pa_channel_map map;
@@ -697,6 +715,15 @@ int pa__init(pa_module *m) {
     pa_sink_input_new_data_set_channel_map(&sink_input_data, &map);
     sink_input_data.flags = PA_SINK_INPUT_VARIABLE_RATE;
 
+    sink_dont_move = FALSE;
+    if (pa_modargs_get_value_boolean(ma, "sink_dont_move", &sink_dont_move) < 0) {
+        pa_log("sink_dont_move= expects a boolean argument.");
+        goto fail;
+    }
+
+    if (sink_dont_move)
+        sink_input_data.flags |= PA_SINK_INPUT_DONT_MOVE;
+
     pa_sink_input_new(&u->sink_input, m->core, &sink_input_data);
     pa_sink_input_new_data_done(&sink_input_data);
 
@@ -738,6 +765,16 @@ int pa__init(pa_module *m) {
 
     pa_source_output_new_data_set_sample_spec(&source_output_data, &ss);
     pa_sink_input_new_data_set_channel_map(&sink_input_data, &map);
+    source_output_data.flags = (pa_source_output_flags_t)0;
+
+    source_dont_move = FALSE;
+    if (pa_modargs_get_value_boolean(ma, "source_dont_move", &source_dont_move) < 0) {
+        pa_log("source_dont_move= expects a boolean argument.");
+        goto fail;
+    }
+
+    if (source_dont_move)
+        source_output_data.flags |= PA_SOURCE_OUTPUT_DONT_MOVE;
 
     pa_source_output_new(&u->source_output, m->core, &source_output_data);
     pa_source_output_new_data_done(&source_output_data);