| /* HR (GSM 06.20) codec wrapper */ |
| |
| /* |
| * This file is part of gapk (GSM Audio Pocket Knife). |
| * |
| * gapk is free software: you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation, either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * gapk 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with gapk. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <gsmhr/gsmhr.h> |
| |
| #include "refsrc/typedefs.h" |
| #include "refsrc/homing.h" |
| #include "refsrc/sp_dec.h" |
| #include "refsrc/sp_enc.h" |
| |
| |
| #define EXPORT __attribute__((visibility("default"))) |
| |
| |
| struct gsmhr { |
| int dec_reset_flg; |
| }; |
| |
| EXPORT struct gsmhr * |
| gsmhr_init(void) |
| { |
| struct gsmhr *state; |
| |
| state = calloc(1, sizeof(struct gsmhr)); |
| if (!state) |
| return NULL; |
| |
| state->dec_reset_flg = 1; |
| |
| return state; |
| } |
| |
| EXPORT void |
| gsmhr_exit(struct gsmhr *state) |
| { |
| free(state); |
| } |
| |
| EXPORT int |
| gsmhr_encode(struct gsmhr *state, int16_t *hr_params, const int16_t *pcm) |
| { |
| int enc_reset_flg; |
| Shortword pcm_b[F_LEN]; |
| |
| memcpy(pcm_b, pcm, F_LEN*sizeof(int16_t)); |
| |
| enc_reset_flg = encoderHomingFrameTest(pcm_b); |
| |
| speechEncoder(pcm_b, hr_params); |
| |
| if (enc_reset_flg) |
| resetEnc(); |
| |
| return 0; |
| } |
| |
| EXPORT int |
| gsmhr_decode(struct gsmhr *state, int16_t *pcm, const int16_t *hr_params) |
| { |
| #define WHOLE_FRAME 18 |
| #define TO_FIRST_SUBFRAME 9 |
| |
| int dec_reset_flg; |
| Shortword hr_params_b[22]; |
| |
| memcpy(hr_params_b, hr_params, 22*sizeof(int16_t)); |
| |
| if (state->dec_reset_flg) |
| dec_reset_flg = decoderHomingFrameTest(hr_params_b, TO_FIRST_SUBFRAME); |
| else |
| dec_reset_flg = 0; |
| |
| if (dec_reset_flg && state->dec_reset_flg) { |
| int i; |
| for (i=0; i<F_LEN; i++) |
| pcm[i] = EHF_MASK; |
| } else { |
| speechDecoder(hr_params_b, pcm); |
| } |
| |
| if (!state->dec_reset_flg) |
| dec_reset_flg = decoderHomingFrameTest(hr_params_b, WHOLE_FRAME); |
| |
| if (dec_reset_flg) |
| resetDec(); |
| |
| state->dec_reset_flg = dec_reset_flg; |
| |
| return 0; |
| } |