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/** Return non-zero when *a == *b */
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int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b) PA_GCC_PURE;
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/** Initialize the specified volume and return a pointer to
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* it. The sample spec will have a defined state but
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* pa_cvolume_valid() will fail for it. \since 0.9.13 */
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pa_cvolume* pa_cvolume_init(pa_cvolume *a);
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/** Set the volume of all channels to PA_VOLUME_NORM */
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#define pa_cvolume_reset(a, n) pa_cvolume_set((a), (n), PA_VOLUME_NORM)
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/** Set the volume of all channels to the specified parameter */
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pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v);
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/** Maximum length of the strings returned by pa_cvolume_snprint() */
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#define PA_CVOLUME_SNPRINT_MAX 64
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/** Maximum length of the strings returned by
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* pa_cvolume_snprint(). Please note that this value can change with
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* any release without warning and without being considered API or ABI
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* breakage. You should not use this definition anywhere where it
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* might become part of an ABI.*/
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#define PA_CVOLUME_SNPRINT_MAX 320
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/** Pretty print a volume structure */
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char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c);
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/** Maximum length of the strings returned by
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* pa_cvolume_snprint_dB(). Please note that this value can change with
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* any release without warning and without being considered API or ABI
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* breakage. You should not use this definition anywhere where it
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* might become part of an ABI. \since 0.9.13 */
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#define PA_SW_CVOLUME_SNPRINT_DB_MAX 448
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/** Pretty print a volume structure but show dB values. \since 0.9.13 */
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char *pa_sw_cvolume_snprint_dB(char *s, size_t l, const pa_cvolume *c);
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/** Return the average volume of all channels */
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pa_volume_t pa_cvolume_avg(const pa_cvolume *a) PA_GCC_PURE;
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/** Return the maximum volume of all channels. \since 0.9.12 */
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pa_volume_t pa_cvolume_max(const pa_cvolume *a) PA_GCC_PURE;
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/** Return TRUE when the passed cvolume structure is valid, FALSE otherwise */
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int pa_cvolume_valid(const pa_cvolume *v) PA_GCC_PURE;
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168
/** Return 1 if the specified volume has all channels on normal level */
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169
#define pa_cvolume_is_norm(a) pa_cvolume_channels_equal_to((a), PA_VOLUME_NORM)
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/** Multiply two volumes specifications, return the result. This uses PA_VOLUME_NORM as neutral element of multiplication. This is only valid for software volumes! */
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/** Multiply two volume specifications, return the result. This uses
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* PA_VOLUME_NORM as neutral element of multiplication. This is only
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* valid for software volumes! */
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pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) PA_GCC_CONST;
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/** Multiply to per-channel volumes and return the result in *dest. This is only valid for software volumes! */
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pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) PA_GCC_PURE;
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/** Convert a decibel value to a volume. This is only valid for software volumes! \since 0.4 */
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/** Multiply two per-channel volumes and return the result in
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* *dest. This is only valid for software volumes! */
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pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b);
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/** Divide two volume specifications, return the result. This uses
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* PA_VOLUME_NORM as neutral element of division. This is only valid
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* for software volumes! If a division by zero is tried the result
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* will be 0. \since 0.9.13 */
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pa_volume_t pa_sw_volume_divide(pa_volume_t a, pa_volume_t b) PA_GCC_CONST;
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/** Multiply to per-channel volumes and return the result in
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* *dest. This is only valid for software volumes! \since 0.9.13 */
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pa_cvolume *pa_sw_cvolume_divide(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b);
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/** Convert a decibel value to a volume. This is only valid for software volumes! */
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pa_volume_t pa_sw_volume_from_dB(double f) PA_GCC_CONST;
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/** Convert a volume to a decibel value. This is only valid for software volumes! \since 0.4 */
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/** Convert a volume to a decibel value. This is only valid for software volumes! */
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double pa_sw_volume_to_dB(pa_volume_t v) PA_GCC_CONST;
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/** Convert a linear factor to a volume. This is only valid for software volumes! \since 0.8 */
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/** Convert a linear factor to a volume. This is only valid for software volumes! */
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pa_volume_t pa_sw_volume_from_linear(double v) PA_GCC_CONST;
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/** Convert a volume to a linear factor. This is only valid for software volumes! \since 0.8 */
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/** Convert a volume to a linear factor. This is only valid for software volumes! */
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200
double pa_sw_volume_to_linear(pa_volume_t v) PA_GCC_CONST;
167
#define PA_DECIBEL_MININFTY (-INFINITY)
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#define PA_DECIBEL_MININFTY ((double) -INFINITY)
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/** This value is used as minus infinity when using pa_volume_{to,from}_dB(). \since 0.4 */
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#define PA_DECIBEL_MININFTY (-200)
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/** This value is used as minus infinity when using pa_volume_{to,from}_dB(). */
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#define PA_DECIBEL_MININFTY ((double) -200.0)
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/** Remap a volume from one channel mapping to a different channel mapping. \since 0.9.12 */
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pa_cvolume *pa_cvolume_remap(pa_cvolume *v, pa_channel_map *from, pa_channel_map *to);
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/** Return non-zero if the specified volume is compatible with
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* the specified sample spec. \since 0.9.13 */
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int pa_cvolume_compatible(const pa_cvolume *v, const pa_sample_spec *ss) PA_GCC_PURE;