Alexandre Lision | 7c6f4a6 | 2013-09-05 13:27:01 -0400 | [diff] [blame] | 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 | |