libsndfile source files.
[Faustine.git] / interpretor / libsndfile-1.0.25 / src / G72x / g72x.h
1 /*
2 ** Copyright (C) 1999-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
3 **
4 ** This program is free software; you can redistribute it and/or modify
5 ** it under the terms of the GNU Lesser General Public License as published by
6 ** the Free Software Foundation; either version 2.1 of the License, or
7 ** (at your option) any later version.
8 **
9 ** This program is distributed in the hope that it will be useful,
10 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
11 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 ** GNU Lesser General Public License for more details.
13 **
14 ** You should have received a copy of the GNU Lesser General Public License
15 ** along with this program; if not, write to the Free Software
16 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 /*
20 ** This file is not the same as the original file from Sun Microsystems. Nearly
21 ** all the original definitions and function prototypes that were in the file
22 ** of this name have been moved to g72x_priv.h.
23 */
24
25 #ifndef G72X_HEADER_FILE
26 #define G72X_HEADER_FILE
27
28 /*
29 ** Number of samples per block to process.
30 ** Must be a common multiple of possible bits per sample : 2, 3, 4, 5 and 8.
31 */
32 #define G72x_BLOCK_SIZE (3 * 5 * 8)
33
34 /*
35 ** Identifiers for the differing kinds of G72x ADPCM codecs.
36 ** The identifiers also define the number of encoded bits per sample.
37 */
38
39 enum
40 { G723_16_BITS_PER_SAMPLE = 2,
41 G723_24_BITS_PER_SAMPLE = 3,
42 G723_40_BITS_PER_SAMPLE = 5,
43
44 G721_32_BITS_PER_SAMPLE = 4,
45 G721_40_BITS_PER_SAMPLE = 5,
46
47 G723_16_SAMPLES_PER_BLOCK = G72x_BLOCK_SIZE,
48 G723_24_SAMPLES_PER_BLOCK = G723_24_BITS_PER_SAMPLE * (G72x_BLOCK_SIZE / G723_24_BITS_PER_SAMPLE),
49 G723_40_SAMPLES_PER_BLOCK = G723_40_BITS_PER_SAMPLE * (G72x_BLOCK_SIZE / G723_40_BITS_PER_SAMPLE),
50
51 G721_32_SAMPLES_PER_BLOCK = G72x_BLOCK_SIZE,
52 G721_40_SAMPLES_PER_BLOCK = G721_40_BITS_PER_SAMPLE * (G72x_BLOCK_SIZE / G721_40_BITS_PER_SAMPLE),
53
54 G723_16_BYTES_PER_BLOCK = (G723_16_BITS_PER_SAMPLE * G72x_BLOCK_SIZE) / 8,
55 G723_24_BYTES_PER_BLOCK = (G723_24_BITS_PER_SAMPLE * G72x_BLOCK_SIZE) / 8,
56 G723_40_BYTES_PER_BLOCK = (G723_40_BITS_PER_SAMPLE * G72x_BLOCK_SIZE) / 8,
57
58 G721_32_BYTES_PER_BLOCK = (G721_32_BITS_PER_SAMPLE * G72x_BLOCK_SIZE) / 8,
59 G721_40_BYTES_PER_BLOCK = (G721_40_BITS_PER_SAMPLE * G72x_BLOCK_SIZE) / 8
60 } ;
61
62 /* Forward declaration of of g72x_state. */
63
64 struct g72x_state ;
65
66 /* External function definitions. */
67
68 struct g72x_state * g72x_reader_init (int codec, int *blocksize, int *samplesperblock) ;
69 struct g72x_state * g72x_writer_init (int codec, int *blocksize, int *samplesperblock) ;
70 /*
71 ** Initialize the ADPCM state table for the given codec.
72 ** Return 0 on success, 1 on fail.
73 */
74
75 int g72x_decode_block (struct g72x_state *pstate, const unsigned char *block, short *samples) ;
76 /*
77 ** The caller fills data->block with data->bytes bytes before calling the
78 ** function. The value data->bytes must be an integer multiple of
79 ** data->blocksize and be <= data->max_bytes.
80 ** When it returns, the caller can read out data->samples samples.
81 */
82
83 int g72x_encode_block (struct g72x_state *pstate, short *samples, unsigned char *block) ;
84 /*
85 ** The caller fills state->samples some integer multiple data->samples_per_block
86 ** (up to G72x_BLOCK_SIZE) samples before calling the function.
87 ** When it returns, the caller can read out bytes encoded bytes.
88 */
89
90 #endif /* !G72X_HEADER_FILE */
91