libpulse: introduce PA_STREAM_RELATIVE_VOLUME

2 files changed, 18 insertions, 2 deletions

diff --git a/src/pulse/def.h b/src/pulse/def.h
index 5d0a0b4b..30a076d5 100644
--- a/src/pulse/def.h
+++ b/src/pulse/def.h
@@ -276,11 +276,18 @@ typedef enum pa_stream_flags {
      * whether to create the stream in muted or in unmuted
      * state. \since 0.9.15 */
 
-    PA_STREAM_FAIL_ON_SUSPEND = 0x20000U
+    PA_STREAM_FAIL_ON_SUSPEND = 0x20000U,
     /**< If the sink/source this stream is connected to is suspended
      * during the creation of this stream, cause it to fail. If the
      * sink/source is being suspended during creation of this stream,
      * make sure this stream is terminated. \since 0.9.15 */
+
+    PA_STREAM_RELATIVE_VOLUME = 0x40000U,
+    /**< If a volume is passed when this stream is created, consider
+     * it relative to the sink's current volume, never as absolute
+     * device volume. If this is not specified the volume will be
+     * consider absolute when the sink is in flat volume mode,
+     * relative otherwise. \since 0.9.20 */
 } pa_stream_flags_t;
 
 /** \cond fulldocs */
@@ -307,6 +314,7 @@ typedef enum pa_stream_flags {
 #define PA_STREAM_DONT_INHIBIT_AUTO_SUSPEND PA_STREAM_DONT_INHIBIT_AUTO_SUSPEND
 #define PA_STREAM_START_UNMUTED PA_STREAM_START_UNMUTED
 #define PA_STREAM_FAIL_ON_SUSPEND PA_STREAM_FAIL_ON_SUSPEND
+#define PA_STREAM_RELATIVE_VOLUME PA_STREAM_RELATIVE_VOLUME
 
 /** \endcond */
 
diff --git a/src/pulse/stream.c b/src/pulse/stream.c
index 2bc2b1e4..29979625 100644
--- a/src/pulse/stream.c
+++ b/src/pulse/stream.c
@@ -1025,7 +1025,8 @@ static int create_stream(
                                               PA_STREAM_EARLY_REQUESTS|
                                               PA_STREAM_DONT_INHIBIT_AUTO_SUSPEND|
                                               PA_STREAM_START_UNMUTED|
-                                              PA_STREAM_FAIL_ON_SUSPEND)), PA_ERR_INVALID);
+                                              PA_STREAM_FAIL_ON_SUSPEND|
+                                              PA_STREAM_RELATIVE_VOLUME)), PA_ERR_INVALID);
 
     PA_CHECK_VALIDITY(s->context, s->context->version >= 12 || !(flags & PA_STREAM_VARIABLE_RATE), PA_ERR_NOTSUPPORTED);
     PA_CHECK_VALIDITY(s->context, s->context->version >= 13 || !(flags & PA_STREAM_PEAK_DETECT), PA_ERR_NOTSUPPORTED);
@@ -1158,6 +1159,13 @@ static int create_stream(
         pa_tagstruct_put_boolean(t, flags & PA_STREAM_FAIL_ON_SUSPEND);
     }
 
+    if (s->context->version >= 17) {
+
+        if (s->direction == PA_STREAM_PLAYBACK)
+            pa_tagstruct_put_boolean(t, flags & PA_STREAM_RELATIVE_VOLUME);
+
+    }
+
     pa_pstream_send_tagstruct(s->context->pstream, t);
     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_create_stream_callback, s, NULL);