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56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
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/* libSoX ADPCM codecs: IMA, OKI, CL. (c) 2007-8 robs@users.sourceforge.net
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
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* General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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typedef struct {
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int max_step_index;
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int sign;
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int shift;
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int const * steps;
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int const * changes;
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int mask;
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} adpcm_setup_t;
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typedef struct {
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adpcm_setup_t setup;
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int last_output;
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int step_index;
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int errors;
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} adpcm_t;
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void lsx_adpcm_init(adpcm_t * p, int type, int first_sample);
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int lsx_adpcm_decode(int code, adpcm_t * p);
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int lsx_adpcm_encode(int sample, adpcm_t * p);
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typedef struct {
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adpcm_t encoder;
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struct {
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uint8_t byte; /* write store */
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uint8_t flag;
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} store;
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sox_fileinfo_t file;
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} adpcm_io_t;
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/* Format methods */
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void lsx_adpcm_reset(adpcm_io_t * state, sox_encoding_t type);
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int lsx_adpcm_oki_start(sox_format_t * ft, adpcm_io_t * state);
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int lsx_adpcm_ima_start(sox_format_t * ft, adpcm_io_t * state);
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size_t lsx_adpcm_read(sox_format_t * ft, adpcm_io_t * state, sox_sample_t *buffer, size_t len);
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int lsx_adpcm_stopread(sox_format_t * ft, adpcm_io_t * state);
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size_t lsx_adpcm_write(sox_format_t * ft, adpcm_io_t * state, const sox_sample_t *buffer, size_t length);
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void lsx_adpcm_flush(sox_format_t * ft, adpcm_io_t * state);
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int lsx_adpcm_stopwrite(sox_format_t * ft, adpcm_io_t * state);
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