ref: 0141f233364b96bee00bee7463c494a981f50e55
dir: /src/adpcms.h/
/*
* This library 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 of the License, or (at
* your option) any later version.
*
* This library 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 library. If not, write to the Free Software Foundation,
* Fifth Floor, 51 Franklin Street, Boston, MA 02111-1301, USA.
*/
/* ADPCM CODECs: IMA, OKI. (c) 2007 robs@users.sourceforge.net */
typedef struct {
int max_step_index;
int sign;
int shift;
int const * steps;
int const * changes;
int mask;
} adpcm_setup_t;
typedef struct {
adpcm_setup_t setup;
int last_output;
int step_index;
int errors;
} adpcm_t;
void adpcm_init(adpcm_t * p, int type, int first_sample);
int adpcm_decode(int code, adpcm_t * p);
int adpcm_encode(int sample, adpcm_t * p);
typedef struct adpcm_io {
adpcm_t encoder;
struct {
uint8_t byte; /* write store */
uint8_t flag;
} store;
sox_fileinfo_t file;
} *adpcm_io_t;
/* Format methods */
void sox_adpcm_reset(adpcm_io_t state, sox_encoding_t type);
int sox_adpcm_oki_start(sox_format_t * ft, adpcm_io_t state);
int sox_adpcm_ima_start(sox_format_t * ft, adpcm_io_t state);
sox_size_t sox_adpcm_read(sox_format_t * ft, adpcm_io_t state, sox_sample_t *buffer, sox_size_t len);
int sox_adpcm_stopread(sox_format_t * ft, adpcm_io_t state);
sox_size_t sox_adpcm_write(sox_format_t * ft, adpcm_io_t state, const sox_sample_t *buffer, sox_size_t length);
void sox_adpcm_flush(sox_format_t * ft, adpcm_io_t state);
int sox_adpcm_stopwrite(sox_format_t * ft, adpcm_io_t state);