volume: add pa_cvolume_inc_clamp function

added function to increase volume not exceeding specified limit
simply changed PA_VOLUME_MAX to 'limit' in pa_cvolume_inc
pa_cvolume_inc now calls pa_cvolume_inc_clamp with PA_VOLUME_MAX limit

diff --git a/src/map-file b/src/map-file
index 5011122..1fffaff 100644 (file)
--- a/src/map-file
+++ b/src/map-file
@@ -130,6 +130,7 @@ pa_cvolume_get_balance;
 pa_cvolume_get_fade;
 pa_cvolume_get_position;
 pa_cvolume_inc;
+pa_cvolume_inc_clamp;
 pa_cvolume_init;
 pa_cvolume_max;
 pa_cvolume_max_mask;

diff --git a/src/pulse/volume.c b/src/pulse/volume.c
index 2d2bba2..59e9a18 100644 (file)
--- a/src/pulse/volume.c
+++ b/src/pulse/volume.c
@@ -885,7 +885,7 @@ pa_cvolume* pa_cvolume_merge(pa_cvolume *dest, const pa_cvolume *a, const pa_cvo
     return dest;
 }
 
-pa_cvolume* pa_cvolume_inc(pa_cvolume *v, pa_volume_t inc) {
+pa_cvolume* pa_cvolume_inc_clamp(pa_cvolume *v, pa_volume_t inc, pa_volume_t limit) {
     pa_volume_t m;
 
     pa_assert(v);
@@ -895,14 +895,18 @@ pa_cvolume* pa_cvolume_inc(pa_cvolume *v, pa_volume_t inc) {
 
     m = pa_cvolume_max(v);
 
-    if (m >= PA_VOLUME_MAX - inc)
-        m = PA_VOLUME_MAX;
+    if (m >= limit - inc)
+        m = limit;
     else
         m += inc;
 
     return pa_cvolume_scale(v, m);
 }
 
+pa_cvolume* pa_cvolume_inc(pa_cvolume *v, pa_volume_t inc){
+    return pa_cvolume_inc_clamp(v, inc, PA_VOLUME_MAX);
+}
+
 pa_cvolume* pa_cvolume_dec(pa_cvolume *v, pa_volume_t dec) {
     pa_volume_t m;
 

diff --git a/src/pulse/volume.h b/src/pulse/volume.h
index c964020..ded4422 100644 (file)
--- a/src/pulse/volume.h
+++ b/src/pulse/volume.h
@@ -348,6 +348,10 @@ pa_volume_t pa_cvolume_get_position(pa_cvolume *cv, const pa_channel_map *map, p
  * and dest may point to the same structure. \since 0.9.16 */
 pa_cvolume* pa_cvolume_merge(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b);
 
+/** Increase the volume passed in by 'inc', but not exceeding 'limit'.
+ * The proportions between the channels are kept. \since 0.9.19 */
+pa_cvolume* pa_cvolume_inc_clamp(pa_cvolume *v, pa_volume_t inc, pa_volume_t limit);
+
 /** Increase the volume passed in by 'inc'. The proportions between
  * the channels are kept. \since 0.9.16 */
 pa_cvolume* pa_cvolume_inc(pa_cvolume *v, pa_volume_t inc);