+/** Return non-zero if the specified volume is compatible with the
+ * specified sample spec. \since 0.9.15 */
+int pa_cvolume_compatible_with_channel_map(const pa_cvolume *v, const pa_channel_map *cm) PA_GCC_PURE;
+
+/** Calculate a 'balance' value for the specified volume with the
+ * specified channel map. The return value will range from -1.0f
+ * (left) to +1.0f (right). If no balance value is applicable to this
+ * channel map the return value will always be 0.0f. See
+ * pa_channel_map_can_balance(). \since 0.9.15 */
+float pa_cvolume_get_balance(const pa_cvolume *v, const pa_channel_map *map) PA_GCC_PURE;
+
+/** Adjust the 'balance' value for the specified volume with the
+ * specified channel map. v will be modified in place and
+ * returned. The balance is a value between -1.0f and +1.0f. This
+ * operation might not be reversible! Also, after this call
+ * pa_cvolume_get_balance() is not guaranteed to actually return the
+ * requested balance value (e.g. when the input volume was zero anyway for
+ * all channels). If no balance value is applicable to
+ * this channel map the volume will not be modified. See
+ * pa_channel_map_can_balance(). \since 0.9.15 */
+pa_cvolume* pa_cvolume_set_balance(pa_cvolume *v, const pa_channel_map *map, float new_balance);
+
+/** Calculate a 'fade' value (i.e.\ 'balance' between front and rear)
+ * for the specified volume with the specified channel map. The return
+ * value will range from -1.0f (rear) to +1.0f (left). If no fade
+ * value is applicable to this channel map the return value will
+ * always be 0.0f. See pa_channel_map_can_fade(). \since 0.9.15 */
+float pa_cvolume_get_fade(const pa_cvolume *v, const pa_channel_map *map) PA_GCC_PURE;
+
+/** Adjust the 'fade' value (i.e.\ 'balance' between front and rear)
+ * for the specified volume with the specified channel map. v will be
+ * modified in place and returned. The balance is a value between
+ * -1.0f and +1.0f. This operation might not be reversible! Also,
+ * after this call pa_cvolume_get_fade() is not guaranteed to actually
+ * return the requested fade value (e.g. when the input volume was
+ * zero anyway for all channels). If no fade value is applicable to
+ * this channel map the volume will not be modified. See
+ * pa_channel_map_can_fade(). \since 0.9.15 */
+pa_cvolume* pa_cvolume_set_fade(pa_cvolume *v, const pa_channel_map *map, float new_fade);
+
+/** Scale the passed pa_cvolume structure so that the maximum volume
+ * of all channels equals max. The proportions between the channel
+ * volumes are kept. \since 0.9.15 */
+pa_cvolume* pa_cvolume_scale(pa_cvolume *v, pa_volume_t max);
+
+/** Scale the passed pa_cvolume structure so that the maximum volume
+ * of all channels selected via cm/mask equals max. This also modifies
+ * the volume of those channels that are unmasked. The proportions
+ * between the channel volumes are kept. \since 0.9.16 */
+pa_cvolume* pa_cvolume_scale_mask(pa_cvolume *v, pa_volume_t max, pa_channel_map *cm, pa_channel_position_mask_t mask);
+
+/** Set the passed volume to all channels at the specified channel
+ * position. Will return the updated volume struct, or NULL if there
+ * is no channel at the position specified. You can check if a channel
+ * map includes a specific position by calling
+ * pa_channel_map_has_position(). \since 0.9.16 */
+pa_cvolume* pa_cvolume_set_position(pa_cvolume *cv, const pa_channel_map *map, pa_channel_position_t t, pa_volume_t v);
+
+/** Get the maximum volume of all channels at the specified channel
+ * position. Will return 0 if there is no channel at the position
+ * specified. You can check if a channel map includes a specific
+ * position by calling pa_channel_map_has_position(). \since 0.9.16 */
+pa_volume_t pa_cvolume_get_position(pa_cvolume *cv, const pa_channel_map *map, pa_channel_position_t t) PA_GCC_PURE;
+
+/** This goes through all channels in a and b and sets the
+ * corresponding channel in dest to the greater volume of both. a, b
+ * 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);
+
+/** Decrease the volume passed in by 'dec'. The proportions between
+ * the channels are kept. \since 0.9.16 */
+pa_cvolume* pa_cvolume_dec(pa_cvolume *v, pa_volume_t dec);
+