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);