2017-05-27 14:42:14 +00:00
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/* Classic .amr file format. Be warned, actaully contains EFR ;) */
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2010-10-29 09:47:06 +00:00
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/*
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* This file is part of gapk (GSM Audio Pocket Knife).
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*
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* gapk is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* gapk is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with gapk. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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2017-05-28 08:20:54 +00:00
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#include <assert.h>
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2010-10-29 09:47:06 +00:00
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#include <osmocom/codec/codec.h>
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2017-08-30 13:26:02 +00:00
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#include <osmocom/gapk/codecs.h>
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#include <osmocom/gapk/formats.h>
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#include <osmocom/gapk/utils.h>
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2010-10-29 09:47:06 +00:00
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2017-05-28 08:20:54 +00:00
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#define EFR_LEN 32
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2010-10-29 09:47:06 +00:00
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2017-05-27 14:42:14 +00:00
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/* conversion function: .amr file -> canonical format */
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2010-10-29 09:47:06 +00:00
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static int
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2017-05-28 08:20:54 +00:00
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amr_efr_from_canon(uint8_t *dst, const uint8_t *src, unsigned int src_len)
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2010-10-29 09:47:06 +00:00
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{
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int i;
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2017-05-28 08:20:54 +00:00
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assert(src_len == EFR_CANON_LEN);
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2010-10-29 09:47:06 +00:00
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dst[ 0] = 0x3c;
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dst[31] = 0x00; /* last nibble won't written, pre-clear it */
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for (i=0; i<244; i++) {
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int si = gsm690_12_2_bitorder[i];
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int di = i;
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msb_put_bit(&dst[1], di, msb_get_bit(src, si));
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}
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2017-05-28 08:20:54 +00:00
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return EFR_LEN;
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2010-10-29 09:47:06 +00:00
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}
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2017-05-27 14:42:14 +00:00
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/* conversion function: canonical format -> .amr file */
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2010-10-29 09:47:06 +00:00
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static int
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2017-05-28 08:20:54 +00:00
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amr_efr_to_canon(uint8_t *dst, const uint8_t *src, unsigned int src_len)
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2010-10-29 09:47:06 +00:00
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{
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int i;
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2017-05-28 08:20:54 +00:00
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assert(src_len == EFR_LEN);
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2010-10-29 09:47:06 +00:00
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if (src[0] != 0x3c)
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return -1;
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dst[30] = 0x00; /* last nibble won't written, pre-clear it */
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for (i=0; i<244; i++) {
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int si = i;
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int di = gsm690_12_2_bitorder[i];
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msb_put_bit(dst, di, msb_get_bit(&src[1], si));
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}
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2017-05-28 08:20:54 +00:00
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return EFR_CANON_LEN;
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2010-10-29 09:47:06 +00:00
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}
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2017-08-31 10:22:56 +00:00
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const struct osmo_gapk_format_desc fmt_amr_efr = {
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2010-10-29 09:47:06 +00:00
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.type = FMT_AMR_EFR,
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.codec_type = CODEC_EFR,
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.name = "amr-efr",
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.description = "Classic .amr file containing EFR (=AMR 12.2k) data",
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2017-05-28 08:20:54 +00:00
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.frame_len = EFR_LEN,
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2010-10-29 09:47:06 +00:00
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.conv_from_canon = amr_efr_from_canon,
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.conv_to_canon = amr_efr_to_canon,
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.header_len = 6,
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.header = (const uint8_t *) "#!AMR\x0a",
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};
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