--- a/src/pulsecore/sink-input.c	2016-04-12 16:50:41.311964935 +0200
+++ b/src/pulsecore/sink-input.c	2016-04-12 17:22:40.420961732 +0200
@@ -525,6 +525,11 @@
     reset_callbacks(i);
     i->userdata = NULL;
 
+    if (data->flags & PA_SINK_INPUT_START_RAMP_MUTED)
+        pa_cvolume_ramp_int_init(&i->ramp, PA_VOLUME_MUTED, data->sample_spec.channels);
+    else
+        pa_cvolume_ramp_int_init(&i->ramp, PA_VOLUME_NORM, data->sample_spec.channels);
+
     i->thread_info.state = i->state;
     i->thread_info.attached = false;
     pa_atomic_store(&i->thread_info.drained, 1);
@@ -541,6 +546,8 @@
     i->thread_info.playing_for = 0;
     i->thread_info.direct_outputs = pa_hashmap_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
 
+    i->thread_info.ramp = i->ramp;
+
     pa_assert_se(pa_idxset_put(core->sink_inputs, i, &i->index) == 0);
     pa_assert_se(pa_idxset_put(i->sink->inputs, pa_sink_input_ref(i), NULL) == 0);
 
@@ -922,6 +929,8 @@
         while (tchunk.length > 0) {
             pa_memchunk wchunk;
             bool nvfs = need_volume_factor_sink;
+            pa_cvolume target;
+            bool tmp;
 
             wchunk = tchunk;
             pa_memblock_ref(wchunk.memblock);
@@ -958,6 +967,16 @@
                     pa_volume_memchunk(&wchunk, &i->sink->sample_spec, &i->volume_factor_sink);
                 }
 
+                /* check for possible volume ramp */
+                if (pa_cvolume_ramp_active(&i->thread_info.ramp)) {
+                    pa_memchunk_make_writable(&wchunk, 0);
+                    pa_volume_ramp_memchunk(&wchunk, &i->sink->sample_spec, &(i->thread_info.ramp));
+                } else if ((tmp = pa_cvolume_ramp_target_active(&(i->thread_info.ramp)))) {
+                    pa_memchunk_make_writable(&wchunk, 0);
+                    pa_cvolume_ramp_get_targets(&i->thread_info.ramp, &target);
+                    pa_volume_memchunk(&wchunk, &i->sink->sample_spec, &target);
+                }
+
                 pa_memblockq_push_align(i->thread_info.render_memblockq, &wchunk);
             } else {
                 pa_memchunk rchunk;
@@ -974,6 +993,16 @@
                         pa_volume_memchunk(&rchunk, &i->sink->sample_spec, &i->volume_factor_sink);
                     }
 
+                    /* check for possible volume ramp */
+                    if (pa_cvolume_ramp_active(&i->thread_info.ramp)) {
+                        pa_memchunk_make_writable(&wchunk, 0);
+                        pa_volume_ramp_memchunk(&wchunk, &i->sink->sample_spec, &(i->thread_info.ramp));
+                    } else if ((tmp = pa_cvolume_ramp_target_active(&(i->thread_info.ramp)))) {
+                        pa_memchunk_make_writable(&wchunk, 0);
+                        pa_cvolume_ramp_get_targets(&i->thread_info.ramp, &target);
+                        pa_volume_memchunk(&wchunk, &i->sink->sample_spec, &target);
+                    }
+
                     pa_memblockq_push_align(i->thread_info.render_memblockq, &rchunk);
                     pa_memblock_unref(rchunk.memblock);
                 }
@@ -1338,6 +1367,31 @@
     return 0;
 }
 
+/* Called from main thread */
+void pa_sink_input_set_volume_ramp(
+        pa_sink_input *i,
+        const pa_cvolume_ramp *ramp,
+        bool send_msg,
+        bool save) {
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_ctl_context();
+    pa_assert(PA_SINK_INPUT_IS_LINKED(i->state));
+    pa_assert(ramp);
+
+    pa_cvolume_ramp_convert(ramp, &i->ramp, i->sample_spec.rate);
+
+    pa_log_debug("setting volume ramp with target vol:%d and length:%ld",
+                i->ramp.ramps[0].target,
+                i->ramp.ramps[0].length);
+
+
+    /* This tells the sink that volume ramp changed */
+    if (send_msg)
+        pa_assert_se(pa_asyncmsgq_send(i->sink->asyncmsgq, PA_MSGOBJECT(i), PA_SINK_INPUT_MESSAGE_SET_VOLUME_RAMP,
+                                       NULL, 0, NULL) == 0);
+}
+
 /* Called from main context */
 static void set_real_ratio(pa_sink_input *i, const pa_cvolume *v) {
     pa_sink_input_assert_ref(i);
@@ -1929,6 +1983,12 @@
             }
             return 0;
 
+        case PA_SINK_INPUT_MESSAGE_SET_VOLUME_RAMP:
+            /* we have ongoing ramp where we take current start values */
+            pa_cvolume_ramp_start_from(&i->thread_info.ramp, &i->ramp);
+            i->thread_info.ramp = i->ramp;
+            return 0;
+
         case PA_SINK_INPUT_MESSAGE_SET_SOFT_MUTE:
             if (i->thread_info.muted != i->muted) {
                 i->thread_info.muted = i->muted;
--- a/src/pulsecore/sink-input.h	2016-04-12 16:50:46.712964926 +0200
+++ b/src/pulsecore/sink-input.h	2016-04-12 17:30:24.289960958 +0200
@@ -59,7 +59,8 @@
     PA_SINK_INPUT_DONT_INHIBIT_AUTO_SUSPEND = 256,
     PA_SINK_INPUT_NO_CREATE_ON_SUSPEND = 512,
     PA_SINK_INPUT_KILL_ON_SUSPEND = 1024,
-    PA_SINK_INPUT_PASSTHROUGH = 2048
+    PA_SINK_INPUT_PASSTHROUGH = 2048,
+    PA_SINK_INPUT_START_RAMP_MUTED = 4096,
 } pa_sink_input_flags_t;
 
 struct pa_sink_input {
@@ -122,6 +123,9 @@
      * this.*/
     bool save_sink:1, save_volume:1, save_muted:1;
 
+    /* for volume ramps */
+    pa_cvolume_ramp_int ramp;
+
     pa_resample_method_t requested_resample_method, actual_resample_method;
 
     /* Returns the chunk of audio data and drops it from the
@@ -250,6 +254,8 @@
         pa_usec_t requested_sink_latency;
 
         pa_hashmap *direct_outputs;
+
+        pa_cvolume_ramp_int ramp;
     } thread_info;
 
     void *userdata;
@@ -266,6 +272,7 @@
     PA_SINK_INPUT_MESSAGE_SET_STATE,
     PA_SINK_INPUT_MESSAGE_SET_REQUESTED_LATENCY,
     PA_SINK_INPUT_MESSAGE_GET_REQUESTED_LATENCY,
+    PA_SINK_INPUT_MESSAGE_SET_VOLUME_RAMP,
     PA_SINK_INPUT_MESSAGE_MAX
 };
 
@@ -374,6 +381,8 @@
 
 void pa_sink_input_set_mute(pa_sink_input *i, bool mute, bool save);
 
+void pa_sink_input_set_volume_ramp(pa_sink_input *i, const pa_cvolume_ramp *ramp, bool send_msg, bool save);
+
 void pa_sink_input_update_proplist(pa_sink_input *i, pa_update_mode_t mode, pa_proplist *p);
 
 pa_resample_method_t pa_sink_input_get_resample_method(pa_sink_input *i);