104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/* GMR-1 AMBE vocoder */
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/* (C) 2011-2019 by Sylvain Munaut <tnt@246tNt.com>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero 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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* This program 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*! \addtogroup codec
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* @{
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*/
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/*! \file codec/codec.c
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* \brief Osmocom GMR-1 AMBE vocoder public API implementation
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*/
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#include <string.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <osmocom/gmr1/codec/codec.h>
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#include "private.h"
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/*! \brief Structure for GMR1 codec state */
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struct gmr1_codec
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{
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struct ambe_decoder dec; /*!< \brief Decoder state */
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};
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/*! \brief Allocates and inits a codec object
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* \returns A newly allocated codec, to be freed with \ref gmr1_codec_release
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*/
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struct gmr1_codec *
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gmr1_codec_alloc(void)
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{
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struct gmr1_codec *codec;
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codec = calloc(1, sizeof(struct gmr1_codec));
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if (!codec)
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return NULL;
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ambe_decode_init(&codec->dec);
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return codec;
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}
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/*! \brief Release a codec object created by \ref gmr1_codec_alloc
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* \param[in] codec The codec object to release
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*/
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void
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gmr1_codec_release(struct gmr1_codec *codec)
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{
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if (!codec)
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return;
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ambe_decode_fini(&codec->dec);
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free(codec);
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}
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/*! \brief Decodes an AMBE frame to audio
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* \param[in] codec Codec object
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* \param[out] audio Output audio buffer
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* \param[in] N number of audio samples to produce (152..168)
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* \param[in] frame Frame data (10 bytes = 80 bits)
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* \param[in] bad Bad Frame Indicator. Set to 1 if frame is corrupt
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* \returns 0 for success. Negative error code otherwise.
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*/
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int
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gmr1_codec_decode_frame(struct gmr1_codec *codec,
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int16_t *audio, int N,
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const uint8_t *frame, int bad)
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{
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return ambe_decode_frame(&codec->dec, audio, N, frame, bad);
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}
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/*! \brief Generates audio for DTX period
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* \param[in] codec Codec object
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* \param[out] audio Output audio buffer
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* \param[in] N number of audio samples to produce (152..168)
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*/
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int
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gmr1_codec_decode_dtx(struct gmr1_codec *codec,
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int16_t *audio, int N)
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{
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return ambe_decode_dtx(&codec->dec, audio, N);
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}
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/*! @} */
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