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