merge 'lennart' branch back into trunk.

[pulseaudio] / src / pulse / volume.h

diff --git a/src/pulse/volume.h b/src/pulse/volume.h
index a928ff711cac38dbc48509db592de316cf73b0ca..22e5b8a4eaf897a16b20103238c2351afc0ab785 100644 (file)
--- a/src/pulse/volume.h
+++ b/src/pulse/volume.h
@@ -113,7 +113,7 @@ typedef struct pa_cvolume {
 } pa_cvolume;
 
 /** Return non-zero when *a == *b */
-int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b);
+int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b) PA_GCC_PURE;
 
 /** Set the volume of all channels to PA_VOLUME_NORM */
 #define pa_cvolume_reset(a, n) pa_cvolume_set((a), (n), PA_VOLUME_NORM)
@@ -131,13 +131,13 @@ pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v);
 char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c);
 
 /** Return the average volume of all channels */
-pa_volume_t pa_cvolume_avg(const pa_cvolume *a);
+pa_volume_t pa_cvolume_avg(const pa_cvolume *a) PA_GCC_PURE;
 
 /** Return TRUE when the passed cvolume structure is valid, FALSE otherwise */
-int pa_cvolume_valid(const pa_cvolume *v);
+int pa_cvolume_valid(const pa_cvolume *v) PA_GCC_PURE;
 
 /** Return non-zero if the volume of all channels is equal to the specified value */
-int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v);
+int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v) PA_GCC_PURE;
 
 /** Return 1 if the specified volume has all channels muted */
 #define pa_cvolume_is_muted(a) pa_cvolume_channels_equal_to((a), PA_VOLUME_MUTED)
@@ -146,22 +146,22 @@ int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v);
 #define pa_cvolume_is_norm(a) pa_cvolume_channels_equal_to((a), PA_VOLUME_NORM)
 
 /** Multiply two volumes specifications, return the result. This uses PA_VOLUME_NORM as neutral element of multiplication. This is only valid for software volumes! */
-pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b);
+pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) PA_GCC_CONST;
 
 /** Multiply to per-channel volumes and return the result in *dest. This is only valid for software volumes! */
-pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b);
+pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) PA_GCC_PURE;
 
 /** Convert a decibel value to a volume. This is only valid for software volumes! \since 0.4 */
-pa_volume_t pa_sw_volume_from_dB(double f);
+pa_volume_t pa_sw_volume_from_dB(double f) PA_GCC_CONST;
 
 /** Convert a volume to a decibel value. This is only valid for software volumes! \since 0.4 */
-double pa_sw_volume_to_dB(pa_volume_t v);
+double pa_sw_volume_to_dB(pa_volume_t v) PA_GCC_CONST;
 
 /** Convert a linear factor to a volume. This is only valid for software volumes! \since 0.8 */
-pa_volume_t pa_sw_volume_from_linear(double v);
+pa_volume_t pa_sw_volume_from_linear(double v) PA_GCC_CONST;
 
 /** Convert a volume to a linear factor. This is only valid for software volumes! \since 0.8 */
-double pa_sw_volume_to_linear(pa_volume_t v);
+double pa_sw_volume_to_linear(pa_volume_t v) PA_GCC_CONST;
 
 #ifdef INFINITY
 #define PA_DECIBEL_MININFTY (-INFINITY)