mirrors/pulseaudio
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git synced 2025-11-15 06:59:58 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

Documentation work

Browse source 
add pkg-config support for GLIB main loop


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@133 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2004-08-17 17:17:22 +00:00
parent f693aa4c88
commit ca2265f372
36 changed files with 326 additions and 151 deletions
Download patch file Download diff file Expand all files Collapse all files

47
polyp/sample.h
View file

@ -27,26 +27,36 @@
#include "cdecl.h"
/** \file
* Constants and routines for sample type handling */
PA_C_DECL_BEGIN
/** Sample format */
enum pa_sample_format {
PA_SAMPLE_U8,
PA_SAMPLE_ALAW,
PA_SAMPLE_ULAW,
PA_SAMPLE_S16LE,
PA_SAMPLE_S16BE,
PA_SAMPLE_FLOAT32LE,
PA_SAMPLE_FLOAT32BE,
PA_SAMPLE_MAX
PA_SAMPLE_U8, /**< Unsigned 8 Bit PCM */
PA_SAMPLE_ALAW, /**< 8 Bit a-Law */
PA_SAMPLE_ULAW, /**< 8 Bit mu-Law */
PA_SAMPLE_S16LE, /**< Signed 16 Bit PCM, little endian (PC) */
PA_SAMPLE_S16BE, /**< Signed 16 Bit PCM, big endian */
PA_SAMPLE_FLOAT32LE, /**< 32 Bit IEEE floating point, little endian, range -1..1 */
PA_SAMPLE_FLOAT32BE, /**< 32 Bit IEEE floating point, big endian, range -1..1 */
PA_SAMPLE_MAX /**< Upper limit of valid sample types */
};
#ifdef WORDS_BIGENDIAN
/** Signed 16 Bit PCM, native endian */
#define PA_SAMPLE_S16NE PA_SAMPLE_S16BE
/** 32 Bit IEEE floating point, native endian */
#define PA_SAMPLE_FLOAT32NE PA_SAMPLE_FLOAT32BE
#else
/** Signed 16 Bit PCM, native endian */
#define PA_SAMPLE_S16NE PA_SAMPLE_S16LE
/** 32 Bit IEEE floating point, native endian */
#define PA_SAMPLE_FLOAT32NE PA_SAMPLE_FLOAT32LE
#endif
/** A Shortcut for PA_SAMPLE_FLOAT32NE */
#define PA_SAMPLE_FLOAT32 PA_SAMPLE_FLOAT32NE
/** A sample format and attribute specification */
@ -56,23 +66,38 @@ struct pa_sample_spec {
uint8_t channels; /**< Audio channels. (1 for mono, 2 for stereo, ...) */
};
/** Return the amount of bytes playback of a second of audio with the speicified sample type takes */
size_t pa_bytes_per_second(const struct pa_sample_spec *spec);
/** Return the size of a frame with the specific sample type */
size_t pa_frame_size(const struct pa_sample_spec *spec);
/** Calculate the time the specified bytes take to play with the specified sample type */
uint32_t pa_bytes_to_usec(size_t length, const struct pa_sample_spec *spec);
/** Return non-zero when the sample type specification is valid */
int pa_sample_spec_valid(const struct pa_sample_spec *spec);
/** Return non-zero when the two sample type specifications match */
int pa_sample_spec_equal(const struct pa_sample_spec*a, const struct pa_sample_spec*b);
/** Maximum required string length for pa_sample_spec_snprint() */
#define PA_SAMPLE_SNPRINT_MAX_LENGTH 32
void pa_sample_snprint(char *s, size_t l, const struct pa_sample_spec *spec);
/** Pretty print a sample type specification to a string */
void pa_sample_spec_snprint(char *s, size_t l, const struct pa_sample_spec *spec);
/** Volume specification: 0: silence; < 256: diminished volume; 256: normal volume; > 256 amplified volume */
typedef uint32_t pa_volume_t;
/** Normal volume (100%) */
#define PA_VOLUME_NORM (0x100)
/** Muted volume (0%) */
#define PA_VOLUME_MUTE (0)
#define PA_VOLUME_MUTED (0)
/** Multiply two volumes specifications, return the result. This uses PA_VOLUME_NORM as neutral element of multiplication. */
uint32_t pa_volume_multiply(uint32_t a, uint32_t b);
pa_volume_t pa_volume_multiply(pa_volume_t a, pa_volume_t b);
PA_C_DECL_END