mixer/pulse: rename `scale` to `scale_volume`

Make it less generic, to avoid clashes.

NEWS

@@ -8,6 +8,8 @@ ver 0.21.5 (not yet released)
   - ape: map "Album Artist"
 * output
   - shout: add support for TLS
+* mixer
+  - pulse: add "scale_volume" setting
 
 ver 0.21.4 (2019/01/04)
 * database

doc/plugins.rst

@@ -935,7 +935,7 @@ The pulse plugin connects to a `PulseAudio <http://www.freedesktop.org/wiki/Soft
      - Sets the host name of the PulseAudio server. By default, :program:`MPD` connects to the local PulseAudio server.
    * - **sink NAME**
      - Specifies the name of the PulseAudio sink :program:`MPD` should play on.
-   * - **scale FACTOR**
+   * - **scale_volume FACTOR**
      - Specifies a linear scaling coefficient (ranging from 0.5 to 5.0) to apply when adjusting volume through :program:`MPD`.  For example, chosing a factor equal to ``"0.7"`` means that setting the volume to 100 in :program:`MPD` will set the PulseAudio volume to 70%, and a factor equal to ``"3.5"`` means that volume 100 in :program:`MPD` corresponds to a 350% PulseAudio volume.
 
 recorder

src/mixer/plugins/PulseMixerPlugin.cxx

@@ -174,7 +174,7 @@ parse_volume_scale_factor(const char *value) {
 	float factor = ParseFloat(value, &endptr);
 
 	if (*endptr != '\0' || factor < 0.5 || factor > 5.0)
-		throw FormatRuntimeError("scale \"%s\" is not a number in the "
+		throw FormatRuntimeError("\"%s\" is not a number in the "
 					 "range 0.5 to 5.0",
 					 value);
 
@@ -187,7 +187,7 @@ pulse_mixer_init(gcc_unused EventLoop &event_loop, AudioOutput &ao,
 		 const ConfigBlock &block)
 {
 	PulseOutput &po = (PulseOutput &)ao;
-	float scale = parse_volume_scale_factor(block.GetBlockValue("scale"));
+	float scale = parse_volume_scale_factor(block.GetBlockValue("scale_volume"));
 	PulseMixer *pm = new PulseMixer(po, listener, scale);
 
 	pulse_output_set_mixer(po, *pm);