5 This file is part of PulseAudio.
7 Copyright 2011 Intel Corporation
8 Copyright 2011 Collabora Multimedia
9 Copyright 2011 Arun Raghavan <arun.raghavan@collabora.co.uk>
11 PulseAudio is free software; you can redistribute it and/or modify
12 it under the terms of the GNU Lesser General Public License as published
13 by the Free Software Foundation; either version 2.1 of the License,
14 or (at your option) any later version.
16 PulseAudio is distributed in the hope that it will be useful, but
17 WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 General Public License for more details.
21 You should have received a copy of the GNU Lesser General Public License
22 along with PulseAudio; if not, write to the Free Software
23 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
27 #include <pulse/cdecl.h>
28 #include <pulse/gccmacro.h>
29 #include <pulse/proplist.h>
30 #include <pulse/sample.h>
31 #include <pulse/channelmap.h>
34 * Utility functions for handling a stream or sink format */
38 /** Represents the type of encoding used in a stream or accepted by a sink. \since 1.0 */
39 typedef enum pa_encoding {
41 /**< Any encoding format, PCM or compressed */
44 /**< Any PCM format */
46 PA_ENCODING_AC3_IEC61937,
47 /**< AC3 data encapsulated in IEC 61937 header/padding */
49 PA_ENCODING_EAC3_IEC61937,
50 /**< EAC3 data encapsulated in IEC 61937 header/padding */
52 PA_ENCODING_MPEG_IEC61937,
53 /**< MPEG-1 or MPEG-2 (Part 3, not AAC) data encapsulated in IEC 61937 header/padding */
55 PA_ENCODING_DTS_IEC61937,
56 /**< DTS data encapsulated in IEC 61937 header/padding */
59 /**< Valid encoding types must be less than this value */
61 PA_ENCODING_INVALID = -1,
62 /**< Represents an invalid encoding */
65 /** Returns a printable string representing the given encoding type. \since 1.0 */
66 const char *pa_encoding_to_string(pa_encoding_t e) PA_GCC_CONST;
68 /** Converts a string of the form returned by \a pa_encoding_to_string() back to a \a pa_encoding_t. \since 1.0 */
69 pa_encoding_t pa_encoding_from_string(const char *encoding);
71 /** Represents the format of data provided in a stream or processed by a sink. \since 1.0 */
72 typedef struct pa_format_info {
73 pa_encoding_t encoding;
74 /**< The encoding used for the format */
77 /**< Additional encoding-specific properties such as sample rate, bitrate, etc. */
80 /** Allocates a new \a pa_format_info structure. Clients must initialise at least the encoding field themselves. */
81 pa_format_info* pa_format_info_new(void);
83 /** Returns a new \a pa_format_info struct and representing the same format as \a src. */
84 pa_format_info* pa_format_info_copy(const pa_format_info *src);
86 /** Frees a \a pa_format_info structure */
87 void pa_format_info_free(pa_format_info *f);
89 /** Returns non-zero when the format info structure is valid */
90 int pa_format_info_valid(const pa_format_info *f);
92 /** Returns non-zero when the format info structure represents a PCM (i.e.\ uncompressed data) format. */
93 int pa_format_info_is_pcm(const pa_format_info *f);
95 /** Returns non-zero if the format represented by \a first is a subset of
96 * the format represented by \a second. This means that \a second must
97 * have all the fields that \a first does, but the reverse need not
98 * be true. This is typically expected to be used to check if a
99 * stream's format is compatible with a given sink. In such a case,
100 * \a first would be the sink's format and \a second would be the
102 int pa_format_info_is_compatible(pa_format_info *first, pa_format_info *second);
104 /** Maximum required string length for
105 * pa_format_info_snprint(). Please note that this value can change
106 * with any release without warning and without being considered API
107 * or ABI breakage. You should not use this definition anywhere where
108 * it might become part of an ABI. \since 1.0 */
109 #define PA_FORMAT_INFO_SNPRINT_MAX 256
111 /** Return a human-readable string representing the given format. \since 1.0 */
112 char *pa_format_info_snprint(char *s, size_t l, const pa_format_info *f);
114 /** Parse a human-readable string of the form generated by
115 * \a pa_format_info_snprint() into a pa_format_info structure. \since 1.0 */
116 pa_format_info* pa_format_info_from_string(const char *str);
118 /** Sets an integer property on the given format info */
119 void pa_format_info_set_prop_int(pa_format_info *f, const char *key, int value);
120 /** Sets a property with a list of integer values on the given format info */
121 void pa_format_info_set_prop_int_array(pa_format_info *f, const char *key, const int *values, int n_values);
122 /** Sets a property which can have any value in a given integer range on the given format info */
123 void pa_format_info_set_prop_int_range(pa_format_info *f, const char *key, int min, int max);
124 /** Sets a string property on the given format info */
125 void pa_format_info_set_prop_string(pa_format_info *f, const char *key, const char *value);
126 /** Sets a property with a list of string values on the given format info */
127 void pa_format_info_set_prop_string_array(pa_format_info *f, const char *key, const char **values, int n_values);
129 /** Convenience method to set the sample format as a property on the given format */
130 void pa_format_info_set_sample_format(pa_format_info *f, pa_sample_format_t sf);
131 /** Convenience method to set the sampling rate as a property on the given format */
132 void pa_format_info_set_rate(pa_format_info *f, int rate);
133 /** Convenience method to set the number of channels as a property on the given format */
134 void pa_format_info_set_channels(pa_format_info *f, int channels);
135 /** Convenience method to set the channel map as a property on the given format */
136 void pa_format_info_set_channel_map(pa_format_info *f, const pa_channel_map *map);