Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / adx.h
CommitLineData
2ba45a60
DM
1/*
2 * ADX ADPCM codecs
3 * Copyright (c) 2001,2003 BERO
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * SEGA CRI adx codecs.
25 *
26 * Reference documents:
27 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
28 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
29 */
30
31#ifndef AVCODEC_ADX_H
32#define AVCODEC_ADX_H
33
34#include <stdint.h>
35
36#include "avcodec.h"
37
38typedef struct ADXChannelState {
39 int s1,s2;
40} ADXChannelState;
41
42typedef struct ADXContext {
43 int channels;
44 ADXChannelState prev[2];
45 int header_parsed;
46 int eof;
47 int cutoff;
48 int coeff[2];
49} ADXContext;
50
51#define COEFF_BITS 12
52
53#define BLOCK_SIZE 18
54#define BLOCK_SAMPLES 32
55
56/**
57 * Calculate LPC coefficients based on cutoff frequency and sample rate.
58 *
59 * @param cutoff cutoff frequency
60 * @param sample_rate sample rate
61 * @param bits number of bits used to quantize coefficients
62 * @param[out] coeff 2 quantized LPC coefficients
63 */
64void ff_adx_calculate_coeffs(int cutoff, int sample_rate, int bits, int *coeff);
65
66/**
67 * Decode ADX stream header.
68 * Sets avctx->channels and avctx->sample_rate.
69 *
70 * @param avctx codec context
71 * @param buf header data
72 * @param bufsize data size, should be at least 24 bytes
73 * @param[out] header_size size of ADX header
74 * @param[out] coeff 2 LPC coefficients, can be NULL
75 * @return data offset or negative error code if header is invalid
76 */
77int ff_adx_decode_header(AVCodecContext *avctx, const uint8_t *buf,
78 int bufsize, int *header_size, int *coeff);
79
80#endif /* AVCODEC_ADX_H */