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/* Codecs handling */
/*
* 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/>.
*/
#pragma once
#include <stdint.h>
#define FR_CANON_LEN 33
#define HR_CANON_LEN 14
#define EFR_CANON_LEN 31
#define PCM_CANON_LEN (160*sizeof(uint16_t))
#define HR_REF_ENC_LEN (20 * sizeof(uint16_t))
#define HR_REF_DEC_LEN (22 * sizeof(uint16_t))
enum osmo_gapk_codec_type {
CODEC_INVALID = 0,
CODEC_PCM, /* 16 bits PCM samples */
CODEC_HR, /* GSM Half Rate codec GSM 06.20 */
CODEC_FR, /* GSM Full Rate codec GSM 06.10 */
CODEC_EFR, /* GSM Enhanced Full Rate codec GSM 06.60 */
CODEC_AMR, /* GSM Adaptive Multi Rate codec GSM 26.071 */
_CODEC_MAX,
};
/* Need to import here because of enum interdep */
#include <osmocom/gapk/formats.h>
/*! call-back for actual codec conversion function
* \param[in] state opaque state pointer (returned by codec->init)
* \param[out] dst caller-allocated buffer for output data
* \param[in] src input data
* \param[in] src_len length of input data \a src
* \returns number of output bytes written to \a dst; negative on error */
typedef int (*osmo_gapk_codec_conv_cb_t)(void *state, uint8_t *dst,
const uint8_t *src, unsigned int src_len);
struct osmo_gapk_codec_desc {
enum osmo_gapk_codec_type type;
const char *description;
const char *name;
/*!
* Canonical frame size (in bytes);
* 0 in case of variable length
*/
unsigned int canon_frame_len;
/*! What the encoder provides */
enum osmo_gapk_format_type codec_enc_format_type;
/*! What to give the decoder */
enum osmo_gapk_format_type codec_dec_format_type;
/* (De)initialization function pointers */
void *(*codec_init)(void);
void (*codec_exit)(void *state);
/* Encoding / decoding function pointers */
osmo_gapk_codec_conv_cb_t codec_encode;
osmo_gapk_codec_conv_cb_t codec_decode;
};
const struct osmo_gapk_codec_desc *
osmo_gapk_codec_get_from_type(enum osmo_gapk_codec_type type);
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