PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
- by the Free Software Foundation; either version 2 of the License,
+ by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
#include <pulse/sample.h>
#include <pulse/cdecl.h>
#include <pulse/gccmacro.h>
+#include <pulse/version.h>
/** \page channelmap Channel Maps
*
* \li pa_channel_map_init_stereo() - Create a standard stereo mapping.
* \li pa_channel_map_init_auto() - Create a standard channel map for a specific number of channels
* \li pa_channel_map_init_extend() - Similar to
- * pa_channel_map_init_auto() but synthesize a channel map if noone
+ * pa_channel_map_init_auto() but synthesize a channel map if no
* predefined one is known for the specified number of channels.
*
* \section conv_sec Convenience Functions
*/
/** \file
- * Constants and routines for channel mapping handling */
+ * Constants and routines for channel mapping handling
+ *
+ * See also \subpage channelmap
+ */
PA_C_DECL_BEGIN
PA_CHANNEL_POSITION_INVALID = -1,
PA_CHANNEL_POSITION_MONO = 0,
- PA_CHANNEL_POSITION_LEFT,
- PA_CHANNEL_POSITION_RIGHT,
- PA_CHANNEL_POSITION_CENTER,
+ PA_CHANNEL_POSITION_FRONT_LEFT, /**< Apple, Dolby call this 'Left' */
+ PA_CHANNEL_POSITION_FRONT_RIGHT, /**< Apple, Dolby call this 'Right' */
+ PA_CHANNEL_POSITION_FRONT_CENTER, /**< Apple, Dolby call this 'Center' */
- PA_CHANNEL_POSITION_FRONT_LEFT = PA_CHANNEL_POSITION_LEFT,
- PA_CHANNEL_POSITION_FRONT_RIGHT = PA_CHANNEL_POSITION_RIGHT,
- PA_CHANNEL_POSITION_FRONT_CENTER = PA_CHANNEL_POSITION_CENTER,
+/** \cond fulldocs */
+ PA_CHANNEL_POSITION_LEFT = PA_CHANNEL_POSITION_FRONT_LEFT,
+ PA_CHANNEL_POSITION_RIGHT = PA_CHANNEL_POSITION_FRONT_RIGHT,
+ PA_CHANNEL_POSITION_CENTER = PA_CHANNEL_POSITION_FRONT_CENTER,
+/** \endcond */
- PA_CHANNEL_POSITION_REAR_CENTER,
- PA_CHANNEL_POSITION_REAR_LEFT,
- PA_CHANNEL_POSITION_REAR_RIGHT,
+ PA_CHANNEL_POSITION_REAR_CENTER, /**< Microsoft calls this 'Back Center', Apple calls this 'Center Surround', Dolby calls this 'Surround Rear Center' */
+ PA_CHANNEL_POSITION_REAR_LEFT, /**< Microsoft calls this 'Back Left', Apple calls this 'Left Surround' (!), Dolby calls this 'Surround Rear Left' */
+ PA_CHANNEL_POSITION_REAR_RIGHT, /**< Microsoft calls this 'Back Right', Apple calls this 'Right Surround' (!), Dolby calls this 'Surround Rear Right' */
- PA_CHANNEL_POSITION_LFE,
+ PA_CHANNEL_POSITION_LFE, /**< Microsoft calls this 'Low Frequency', Apple calls this 'LFEScreen' */
+/** \cond fulldocs */
PA_CHANNEL_POSITION_SUBWOOFER = PA_CHANNEL_POSITION_LFE,
+/** \endcond */
- PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
- PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
+ PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER, /**< Apple, Dolby call this 'Left Center' */
+ PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER, /**< Apple, Dolby call this 'Right Center */
- PA_CHANNEL_POSITION_SIDE_LEFT,
- PA_CHANNEL_POSITION_SIDE_RIGHT,
+ PA_CHANNEL_POSITION_SIDE_LEFT, /**< Apple calls this 'Left Surround Direct', Dolby calls this 'Surround Left' (!) */
+ PA_CHANNEL_POSITION_SIDE_RIGHT, /**< Apple calls this 'Right Surround Direct', Dolby calls this 'Surround Right' (!) */
PA_CHANNEL_POSITION_AUX0,
PA_CHANNEL_POSITION_AUX1,
PA_CHANNEL_POSITION_AUX30,
PA_CHANNEL_POSITION_AUX31,
- PA_CHANNEL_POSITION_TOP_CENTER,
+ PA_CHANNEL_POSITION_TOP_CENTER, /**< Apple calls this 'Top Center Surround' */
- PA_CHANNEL_POSITION_TOP_FRONT_LEFT,
- PA_CHANNEL_POSITION_TOP_FRONT_RIGHT,
- PA_CHANNEL_POSITION_TOP_FRONT_CENTER,
+ PA_CHANNEL_POSITION_TOP_FRONT_LEFT, /**< Apple calls this 'Vertical Height Left' */
+ PA_CHANNEL_POSITION_TOP_FRONT_RIGHT, /**< Apple calls this 'Vertical Height Right' */
+ PA_CHANNEL_POSITION_TOP_FRONT_CENTER, /**< Apple calls this 'Vertical Height Center' */
- PA_CHANNEL_POSITION_TOP_REAR_LEFT,
- PA_CHANNEL_POSITION_TOP_REAR_RIGHT,
- PA_CHANNEL_POSITION_TOP_REAR_CENTER,
+ PA_CHANNEL_POSITION_TOP_REAR_LEFT, /**< Microsoft and Apple call this 'Top Back Left' */
+ PA_CHANNEL_POSITION_TOP_REAR_RIGHT, /**< Microsoft and Apple call this 'Top Back Right' */
+ PA_CHANNEL_POSITION_TOP_REAR_CENTER, /**< Microsoft and Apple call this 'Top Back Center' */
PA_CHANNEL_POSITION_MAX
} pa_channel_position_t;
+/** \cond fulldocs */
+#define PA_CHANNEL_POSITION_INVALID PA_CHANNEL_POSITION_INVALID
+#define PA_CHANNEL_POSITION_MONO PA_CHANNEL_POSITION_MONO
+#define PA_CHANNEL_POSITION_LEFT PA_CHANNEL_POSITION_LEFT
+#define PA_CHANNEL_POSITION_RIGHT PA_CHANNEL_POSITION_RIGHT
+#define PA_CHANNEL_POSITION_CENTER PA_CHANNEL_POSITION_CENTER
+#define PA_CHANNEL_POSITION_FRONT_LEFT PA_CHANNEL_POSITION_FRONT_LEFT
+#define PA_CHANNEL_POSITION_FRONT_RIGHT PA_CHANNEL_POSITION_FRONT_RIGHT
+#define PA_CHANNEL_POSITION_FRONT_CENTER PA_CHANNEL_POSITION_FRONT_CENTER
+#define PA_CHANNEL_POSITION_REAR_CENTER PA_CHANNEL_POSITION_REAR_CENTER
+#define PA_CHANNEL_POSITION_REAR_LEFT PA_CHANNEL_POSITION_REAR_LEFT
+#define PA_CHANNEL_POSITION_REAR_RIGHT PA_CHANNEL_POSITION_REAR_RIGHT
+#define PA_CHANNEL_POSITION_LFE PA_CHANNEL_POSITION_LFE
+#define PA_CHANNEL_POSITION_SUBWOOFER PA_CHANNEL_POSITION_SUBWOOFER
+#define PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER
+#define PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER
+#define PA_CHANNEL_POSITION_SIDE_LEFT PA_CHANNEL_POSITION_SIDE_LEFT
+#define PA_CHANNEL_POSITION_SIDE_RIGHT PA_CHANNEL_POSITION_SIDE_RIGHT
+#define PA_CHANNEL_POSITION_AUX0 PA_CHANNEL_POSITION_AUX0
+#define PA_CHANNEL_POSITION_AUX1 PA_CHANNEL_POSITION_AUX1
+#define PA_CHANNEL_POSITION_AUX2 PA_CHANNEL_POSITION_AUX2
+#define PA_CHANNEL_POSITION_AUX3 PA_CHANNEL_POSITION_AUX3
+#define PA_CHANNEL_POSITION_AUX4 PA_CHANNEL_POSITION_AUX4
+#define PA_CHANNEL_POSITION_AUX5 PA_CHANNEL_POSITION_AUX5
+#define PA_CHANNEL_POSITION_AUX6 PA_CHANNEL_POSITION_AUX6
+#define PA_CHANNEL_POSITION_AUX7 PA_CHANNEL_POSITION_AUX7
+#define PA_CHANNEL_POSITION_AUX8 PA_CHANNEL_POSITION_AUX8
+#define PA_CHANNEL_POSITION_AUX9 PA_CHANNEL_POSITION_AUX9
+#define PA_CHANNEL_POSITION_AUX10 PA_CHANNEL_POSITION_AUX10
+#define PA_CHANNEL_POSITION_AUX11 PA_CHANNEL_POSITION_AUX11
+#define PA_CHANNEL_POSITION_AUX12 PA_CHANNEL_POSITION_AUX12
+#define PA_CHANNEL_POSITION_AUX13 PA_CHANNEL_POSITION_AUX13
+#define PA_CHANNEL_POSITION_AUX14 PA_CHANNEL_POSITION_AUX14
+#define PA_CHANNEL_POSITION_AUX15 PA_CHANNEL_POSITION_AUX15
+#define PA_CHANNEL_POSITION_AUX16 PA_CHANNEL_POSITION_AUX16
+#define PA_CHANNEL_POSITION_AUX17 PA_CHANNEL_POSITION_AUX17
+#define PA_CHANNEL_POSITION_AUX18 PA_CHANNEL_POSITION_AUX18
+#define PA_CHANNEL_POSITION_AUX19 PA_CHANNEL_POSITION_AUX19
+#define PA_CHANNEL_POSITION_AUX20 PA_CHANNEL_POSITION_AUX20
+#define PA_CHANNEL_POSITION_AUX21 PA_CHANNEL_POSITION_AUX21
+#define PA_CHANNEL_POSITION_AUX22 PA_CHANNEL_POSITION_AUX22
+#define PA_CHANNEL_POSITION_AUX23 PA_CHANNEL_POSITION_AUX23
+#define PA_CHANNEL_POSITION_AUX24 PA_CHANNEL_POSITION_AUX24
+#define PA_CHANNEL_POSITION_AUX25 PA_CHANNEL_POSITION_AUX25
+#define PA_CHANNEL_POSITION_AUX26 PA_CHANNEL_POSITION_AUX26
+#define PA_CHANNEL_POSITION_AUX27 PA_CHANNEL_POSITION_AUX27
+#define PA_CHANNEL_POSITION_AUX28 PA_CHANNEL_POSITION_AUX28
+#define PA_CHANNEL_POSITION_AUX29 PA_CHANNEL_POSITION_AUX29
+#define PA_CHANNEL_POSITION_AUX30 PA_CHANNEL_POSITION_AUX30
+#define PA_CHANNEL_POSITION_AUX31 PA_CHANNEL_POSITION_AUX31
+#define PA_CHANNEL_POSITION_TOP_CENTER PA_CHANNEL_POSITION_TOP_CENTER
+#define PA_CHANNEL_POSITION_TOP_FRONT_LEFT PA_CHANNEL_POSITION_TOP_FRONT_LEFT
+#define PA_CHANNEL_POSITION_TOP_FRONT_RIGHT PA_CHANNEL_POSITION_TOP_FRONT_RIGHT
+#define PA_CHANNEL_POSITION_TOP_FRONT_CENTER PA_CHANNEL_POSITION_TOP_FRONT_CENTER
+#define PA_CHANNEL_POSITION_TOP_REAR_LEFT PA_CHANNEL_POSITION_TOP_REAR_LEFT
+#define PA_CHANNEL_POSITION_TOP_REAR_RIGHT PA_CHANNEL_POSITION_TOP_REAR_RIGHT
+#define PA_CHANNEL_POSITION_TOP_REAR_CENTER PA_CHANNEL_POSITION_TOP_REAR_CENTER
+#define PA_CHANNEL_POSITION_MAX PA_CHANNEL_POSITION_MAX
+/** \endcond */
+
+/** A mask of channel positions. \since 0.9.16 */
+typedef uint64_t pa_channel_position_mask_t;
+
+/** Makes a bit mask from a channel position. \since 0.9.16 */
+#define PA_CHANNEL_POSITION_MASK(f) ((pa_channel_position_mask_t) (1ULL << (f)))
+
/** A list of channel mapping definitions for pa_channel_map_init_auto() */
typedef enum pa_channel_map_def {
PA_CHANNEL_MAP_AIFF,
/**< The mapping from RFC3551, which is based on AIFF-C */
+/** \cond fulldocs */
PA_CHANNEL_MAP_ALSA,
- /**< The default mapping used by ALSA */
+ /**< The default mapping used by ALSA. This mapping is probably
+ * not too useful since ALSA's default channel mapping depends on
+ * the device string used. */
+/** \endcond */
PA_CHANNEL_MAP_AUX,
/**< Only aux channels */
PA_CHANNEL_MAP_WAVEEX,
- /**< Microsoft's WAVEFORMATEXTENSIBLE mapping */
+ /**< Microsoft's WAVEFORMATEXTENSIBLE mapping. This mapping works
+ * as if all LSBs of dwChannelMask are set. */
+/** \cond fulldocs */
PA_CHANNEL_MAP_OSS,
- /**< The default channel mapping used by OSS as defined in the OSS 4.0 API specs */
+ /**< The default channel mapping used by OSS as defined in the OSS
+ * 4.0 API specs. This mapping is probably not too useful since
+ * the OSS API has changed in this respect and no longer knows a
+ * default channel mapping based on the number of channels. */
+/** \endcond */
/**< Upper limit of valid channel mapping definitions */
PA_CHANNEL_MAP_DEF_MAX,
/**< The default channel map */
} pa_channel_map_def_t;
+/** \cond fulldocs */
+#define PA_CHANNEL_MAP_AIFF PA_CHANNEL_MAP_AIFF
+#define PA_CHANNEL_MAP_ALSA PA_CHANNEL_MAP_ALSA
+#define PA_CHANNEL_MAP_AUX PA_CHANNEL_MAP_AUX
+#define PA_CHANNEL_MAP_WAVEEX PA_CHANNEL_MAP_WAVEEX
+#define PA_CHANNEL_MAP_OSS PA_CHANNEL_MAP_OSS
+#define PA_CHANNEL_MAP_DEF_MAX PA_CHANNEL_MAP_DEF_MAX
+#define PA_CHANNEL_MAP_DEFAULT PA_CHANNEL_MAP_DEFAULT
+/** \endcond */
+
/** A channel map which can be used to attach labels to specific
* channels of a stream. These values are relevant for conversion and
* mixing of streams */
* pa_channel_map_valid() will fail for it. */
pa_channel_map* pa_channel_map_init(pa_channel_map *m);
-/** Initialize the specified channel map for monoaural audio and return a pointer to it */
+/** Initialize the specified channel map for monaural audio and return a pointer to it */
pa_channel_map* pa_channel_map_init_mono(pa_channel_map *m);
/** Initialize the specified channel map for stereophonic audio and return a pointer to it */
/** Return a text label for the specified channel position */
const char* pa_channel_position_to_string(pa_channel_position_t pos) PA_GCC_PURE;
+/** The inverse of pa_channel_position_to_string(). \since 0.9.16 */
+pa_channel_position_t pa_channel_position_from_string(const char *s) PA_GCC_PURE;
+
/** Return a human readable text label for the specified channel position. \since 0.9.7 */
const char* pa_channel_position_to_pretty_string(pa_channel_position_t pos);
* it might become part of an ABI. */
#define PA_CHANNEL_MAP_SNPRINT_MAX 336
-/** Make a humand readable string from the specified channel map */
+/** Make a human readable string from the specified channel map */
char* pa_channel_map_snprint(char *s, size_t l, const pa_channel_map *map);
-/** Parse a channel position list into a channel map structure. */
+/** Parse a channel position list or well-known mapping name into a
+ * channel map structure. This turns the output of
+ * pa_channel_map_snprint() and pa_channel_map_to_name() back into a
+ * pa_channel_map */
pa_channel_map *pa_channel_map_parse(pa_channel_map *map, const char *s);
/** Compare two channel maps. Return 1 if both match. */
* the specified sample spec. \since 0.9.12 */
int pa_channel_map_compatible(const pa_channel_map *map, const pa_sample_spec *ss) PA_GCC_PURE;
+/** Returns non-zero if every channel defined in b is also defined in a. \since 0.9.15 */
+int pa_channel_map_superset(const pa_channel_map *a, const pa_channel_map *b) PA_GCC_PURE;
+
+/** Returns non-zero if it makes sense to apply a volume 'balance'
+ * with this mapping, i.e.\ if there are left/right channels
+ * available. \since 0.9.15 */
+int pa_channel_map_can_balance(const pa_channel_map *map) PA_GCC_PURE;
+
+/** Returns non-zero if it makes sense to apply a volume 'fade'
+ * (i.e.\ 'balance' between front and rear) with this mapping, i.e.\ if
+ * there are front/rear channels available. \since 0.9.15 */
+int pa_channel_map_can_fade(const pa_channel_map *map) PA_GCC_PURE;
+
+/** Tries to find a well-known channel mapping name for this channel
+ * mapping, i.e.\ "stereo", "surround-71" and so on. If the channel
+ * mapping is unknown NULL will be returned. This name can be parsed
+ * with pa_channel_map_parse() \since 0.9.15 */
+const char* pa_channel_map_to_name(const pa_channel_map *map) PA_GCC_PURE;
+
+/** Tries to find a human readable text label for this channel
+mapping, i.e.\ "Stereo", "Surround 7.1" and so on. If the channel
+mapping is unknown NULL will be returned. \since 0.9.15 */
+const char* pa_channel_map_to_pretty_name(const pa_channel_map *map) PA_GCC_PURE;
+
+/** Returns non-zero if the specified channel position is available at
+ * least once in the channel map. \since 0.9.16 */
+int pa_channel_map_has_position(const pa_channel_map *map, pa_channel_position_t p) PA_GCC_PURE;
+
+/** Generates a bit mask from a channel map. \since 0.9.16 */
+pa_channel_position_mask_t pa_channel_map_mask(const pa_channel_map *map) PA_GCC_PURE;
+
PA_C_DECL_END
#endif