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/* Classic .amr file format. Be warned, actaully contains EFR ;) */
/*
* 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 <assert.h>
#include <osmocom/codec/codec.h>
#include <gapk/codecs.h>
#include <gapk/formats.h>
#include <gapk/utils.h>
#define EFR_LEN 32
/* conversion function: .amr file -> canonical format */
static int
amr_efr_from_canon(uint8_t *dst, const uint8_t *src, unsigned int src_len)
{
int i;
assert(src_len == EFR_CANON_LEN);
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 EFR_LEN;
}
/* conversion function: canonical format -> .amr file */
static int
amr_efr_to_canon(uint8_t *dst, const uint8_t *src, unsigned int src_len)
{
int i;
assert(src_len == EFR_LEN);
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 EFR_CANON_LEN;
}
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 = EFR_LEN,
.conv_from_canon = amr_efr_from_canon,
.conv_to_canon = amr_efr_to_canon,
.header_len = 6,
.header = (const uint8_t *) "#!AMR\x0a",
};
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