chromium/third_party/ffmpeg/libavcodec/pcm_tablegen.h

/*
 * Header file for hardcoded PCM tables
 *
 * Copyright (c) 2010 Reimar Döffinger <[email protected]>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_PCM_TABLEGEN_H
#define AVCODEC_PCM_TABLEGEN_H

#include <stdint.h>
#include "libavutil/attributes.h"

/* from g711.c by SUN microsystems (unrestricted use) */

#define SIGN_BIT …
#define QUANT_MASK …
#define NSEGS …
#define SEG_SHIFT …
#define SEG_MASK …

#define BIAS …

#define VIDC_SIGN_BIT …
#define VIDC_QUANT_MASK …
#define VIDC_QUANT_SHIFT …
#define VIDC_SEG_SHIFT …
#define VIDC_SEG_MASK …

/* alaw2linear() - Convert an A-law value to 16-bit linear PCM */
static av_cold int alaw2linear(unsigned char a_val)
{ … }

static av_cold int ulaw2linear(unsigned char u_val)
{ … }

static av_cold int vidc2linear(unsigned char u_val)
{ … }

#if CONFIG_HARDCODED_TABLES
#define pcm_alaw_tableinit …
#define pcm_ulaw_tableinit …
#define pcm_vidc_tableinit …
#include "libavcodec/pcm_tables.h"
#else
/* 16384 entries per table */
static uint8_t linear_to_alaw[16384];
static uint8_t linear_to_ulaw[16384];
static uint8_t linear_to_vidc[16384];

static av_cold void build_xlaw_table(uint8_t *linear_to_xlaw,
                             int (*xlaw2linear)(unsigned char),
                             int mask)
{ … }

static void pcm_alaw_tableinit(void)
{ … }

static void pcm_ulaw_tableinit(void)
{ … }

static void pcm_vidc_tableinit(void)
{ … }
#endif /* CONFIG_HARDCODED_TABLES */

#endif /* AVCODEC_PCM_TABLEGEN_H */