mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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148202d432
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@256 fefdeb5f-60dc-0310-8127-8f9354f1896f
134 lines
4.8 KiB
C
134 lines
4.8 KiB
C
#ifndef foosamplehfoo
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#define foosamplehfoo
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/* $Id$ */
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/***
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This file is part of polypaudio.
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polypaudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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polypaudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with polypaudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#include <inttypes.h>
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#include <sys/types.h>
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#include <math.h>
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#include "cdecl.h"
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/** \file
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* Constants and routines for sample type handling */
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PA_C_DECL_BEGIN
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/** Sample format */
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enum pa_sample_format {
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PA_SAMPLE_U8, /**< Unsigned 8 Bit PCM */
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PA_SAMPLE_ALAW, /**< 8 Bit a-Law */
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PA_SAMPLE_ULAW, /**< 8 Bit mu-Law */
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PA_SAMPLE_S16LE, /**< Signed 16 Bit PCM, little endian (PC) */
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PA_SAMPLE_S16BE, /**< Signed 16 Bit PCM, big endian */
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PA_SAMPLE_FLOAT32LE, /**< 32 Bit IEEE floating point, little endian, range -1..1 */
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PA_SAMPLE_FLOAT32BE, /**< 32 Bit IEEE floating point, big endian, range -1..1 */
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PA_SAMPLE_MAX, /**< Upper limit of valid sample types */
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PA_SAMPLE_INVALID = -1 /**< An invalid value */
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};
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#ifdef WORDS_BIGENDIAN
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/** Signed 16 Bit PCM, native endian */
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#define PA_SAMPLE_S16NE PA_SAMPLE_S16BE
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/** 32 Bit IEEE floating point, native endian */
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#define PA_SAMPLE_FLOAT32NE PA_SAMPLE_FLOAT32BE
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#else
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/** Signed 16 Bit PCM, native endian */
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#define PA_SAMPLE_S16NE PA_SAMPLE_S16LE
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/** 32 Bit IEEE floating point, native endian */
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#define PA_SAMPLE_FLOAT32NE PA_SAMPLE_FLOAT32LE
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#endif
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/** A Shortcut for PA_SAMPLE_FLOAT32NE */
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#define PA_SAMPLE_FLOAT32 PA_SAMPLE_FLOAT32NE
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/** A sample format and attribute specification */
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struct pa_sample_spec {
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enum pa_sample_format format; /**< The sample format */
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uint32_t rate; /**< The sample rate. (e.g. 44100) */
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uint8_t channels; /**< Audio channels. (1 for mono, 2 for stereo, ...) */
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};
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/** Type for usec specifications (unsigned). May be either 32 or 64 bit, depending on the architecture */
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typedef uint64_t pa_usec_t;
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/** Return the amount of bytes playback of a second of audio with the specified sample type takes */
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size_t pa_bytes_per_second(const struct pa_sample_spec *spec);
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/** Return the size of a frame with the specific sample type */
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size_t pa_frame_size(const struct pa_sample_spec *spec);
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/** Calculate the time the specified bytes take to play with the specified sample type */
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pa_usec_t pa_bytes_to_usec(uint64_t length, const struct pa_sample_spec *spec);
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/** Return non-zero when the sample type specification is valid */
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int pa_sample_spec_valid(const struct pa_sample_spec *spec);
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/** Return non-zero when the two sample type specifications match */
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int pa_sample_spec_equal(const struct pa_sample_spec*a, const struct pa_sample_spec*b);
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/** Maximum required string length for pa_sample_spec_snprint() */
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#define PA_SAMPLE_SPEC_SNPRINT_MAX 32
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/** Pretty print a sample type specification to a string */
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void pa_sample_spec_snprint(char *s, size_t l, const struct pa_sample_spec *spec);
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/** Volume specification: 0: silence; < 256: diminished volume; 256: normal volume; > 256 amplified volume */
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typedef uint32_t pa_volume_t;
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/** Normal volume (100%) */
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#define PA_VOLUME_NORM (0x100)
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/** Muted volume (0%) */
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#define PA_VOLUME_MUTED (0)
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/** Multiply two volumes specifications, return the result. This uses PA_VOLUME_NORM as neutral element of multiplication. */
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pa_volume_t pa_volume_multiply(pa_volume_t a, pa_volume_t b);
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/** Convert volume from decibel to linear level. \since 0.4 */
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pa_volume_t pa_volume_from_dB(double f);
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/** Convert volume from linear level to decibel. \since 0.4 */
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double pa_volume_to_dB(pa_volume_t v);
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/** Convert volume to scaled value understandable by the user (between 0 and 1). \since 0.6 */
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double pa_volume_to_user(pa_volume_t v);
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/** Convert user volume to polypaudio volume. \since 0.6 */
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pa_volume_t pa_volume_from_user(double v);
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#ifdef INFINITY
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#define PA_DECIBEL_MININFTY (-INFINITY)
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#else
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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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#endif
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/** Pretty print a byte size value. (i.e. "2.5 MB") */
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void pa_bytes_snprint(char *s, size_t l, unsigned v);
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/** Parse a sample format text */
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enum pa_sample_format pa_parse_sample_format(const char *format);
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PA_C_DECL_END
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#endif
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