| /* |
| ** Copyright (C) 1999-2011 Erik de Castro Lopo <erikd@mega-nerd.com> |
| ** |
| ** This program 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. |
| ** |
| ** This program 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 this program; if not, write to the Free Software |
| ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| /* |
| ** This file is not the same as the original file from Sun Microsystems. Nearly |
| ** all the original definitions and function prototypes that were in the file |
| ** of this name have been moved to g72x_priv.h. |
| */ |
| |
| #ifndef G72X_HEADER_FILE |
| #define G72X_HEADER_FILE |
| |
| /* |
| ** Number of samples per block to process. |
| ** Must be a common multiple of possible bits per sample : 2, 3, 4, 5 and 8. |
| */ |
| #define G72x_BLOCK_SIZE (3 * 5 * 8) |
| |
| /* |
| ** Identifiers for the differing kinds of G72x ADPCM codecs. |
| ** The identifiers also define the number of encoded bits per sample. |
| */ |
| |
| enum |
| { G723_16_BITS_PER_SAMPLE = 2, |
| G723_24_BITS_PER_SAMPLE = 3, |
| G723_40_BITS_PER_SAMPLE = 5, |
| |
| G721_32_BITS_PER_SAMPLE = 4, |
| G721_40_BITS_PER_SAMPLE = 5, |
| |
| G723_16_SAMPLES_PER_BLOCK = G72x_BLOCK_SIZE, |
| G723_24_SAMPLES_PER_BLOCK = G723_24_BITS_PER_SAMPLE * (G72x_BLOCK_SIZE / G723_24_BITS_PER_SAMPLE), |
| G723_40_SAMPLES_PER_BLOCK = G723_40_BITS_PER_SAMPLE * (G72x_BLOCK_SIZE / G723_40_BITS_PER_SAMPLE), |
| |
| G721_32_SAMPLES_PER_BLOCK = G72x_BLOCK_SIZE, |
| G721_40_SAMPLES_PER_BLOCK = G721_40_BITS_PER_SAMPLE * (G72x_BLOCK_SIZE / G721_40_BITS_PER_SAMPLE), |
| |
| G723_16_BYTES_PER_BLOCK = (G723_16_BITS_PER_SAMPLE * G72x_BLOCK_SIZE) / 8, |
| G723_24_BYTES_PER_BLOCK = (G723_24_BITS_PER_SAMPLE * G72x_BLOCK_SIZE) / 8, |
| G723_40_BYTES_PER_BLOCK = (G723_40_BITS_PER_SAMPLE * G72x_BLOCK_SIZE) / 8, |
| |
| G721_32_BYTES_PER_BLOCK = (G721_32_BITS_PER_SAMPLE * G72x_BLOCK_SIZE) / 8, |
| G721_40_BYTES_PER_BLOCK = (G721_40_BITS_PER_SAMPLE * G72x_BLOCK_SIZE) / 8 |
| } ; |
| |
| /* Forward declaration of of g72x_state. */ |
| |
| struct g72x_state ; |
| |
| /* External function definitions. */ |
| |
| struct g72x_state * g72x_reader_init (int codec, int *blocksize, int *samplesperblock) ; |
| struct g72x_state * g72x_writer_init (int codec, int *blocksize, int *samplesperblock) ; |
| /* |
| ** Initialize the ADPCM state table for the given codec. |
| ** Return 0 on success, 1 on fail. |
| */ |
| |
| int g72x_decode_block (struct g72x_state *pstate, const unsigned char *block, short *samples) ; |
| /* |
| ** The caller fills data->block with data->bytes bytes before calling the |
| ** function. The value data->bytes must be an integer multiple of |
| ** data->blocksize and be <= data->max_bytes. |
| ** When it returns, the caller can read out data->samples samples. |
| */ |
| |
| int g72x_encode_block (struct g72x_state *pstate, short *samples, unsigned char *block) ; |
| /* |
| ** The caller fills state->samples some integer multiple data->samples_per_block |
| ** (up to G72x_BLOCK_SIZE) samples before calling the function. |
| ** When it returns, the caller can read out bytes encoded bytes. |
| */ |
| |
| #endif /* !G72X_HEADER_FILE */ |
| |