| /* Classic .amr file format */ |
| |
| /* |
| * 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 <osmocom/codec/codec.h> |
| |
| #include <gapk/codecs.h> |
| #include <gapk/formats.h> |
| #include <gapk/utils.h> |
| |
| |
| static int |
| amr_efr_from_canon(uint8_t *dst, const uint8_t *src) |
| { |
| int i; |
| |
| dst[ 0] = 0x3c; |
| dst[31] = 0x00; /* last nibble won't written, pre-clear it */ |
| |
| for (i=0; i<244; i++) { |
| int si = gsm690_12_2_bitorder[i]; |
| int di = i; |
| msb_put_bit(&dst[1], di, msb_get_bit(src, si)); |
| } |
| |
| return 0; |
| } |
| |
| static int |
| amr_efr_to_canon(uint8_t *dst, const uint8_t *src) |
| { |
| int i; |
| |
| if (src[0] != 0x3c) |
| return -1; |
| |
| dst[30] = 0x00; /* last nibble won't written, pre-clear it */ |
| |
| for (i=0; i<244; i++) { |
| int si = i; |
| int di = gsm690_12_2_bitorder[i]; |
| msb_put_bit(dst, di, msb_get_bit(&src[1], si)); |
| } |
| |
| return 0; |
| } |
| |
| const struct format_desc fmt_amr_efr = { |
| .type = FMT_AMR_EFR, |
| .codec_type = CODEC_EFR, |
| .name = "amr-efr", |
| .description = "Classic .amr file containing EFR (=AMR 12.2k) data", |
| |
| .frame_len = 32, |
| .conv_from_canon = amr_efr_from_canon, |
| .conv_to_canon = amr_efr_to_canon, |
| |
| .header_len = 6, |
| .header = (const uint8_t *) "#!AMR\x0a", |
| }; |