mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 4302 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
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/*
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* Interface to libgsm for gsm encoding/decoding |
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* Copyright (c) 2005 Alban Bedel <albeu@free.fr> |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library 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 GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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/**
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* @file libgsm.c |
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* Interface to libgsm for gsm encoding/decoding |
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*/ |
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#include "avcodec.h" |
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#include <gsm.h> |
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// gsm.h miss some essential constants
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#define GSM_BLOCK_SIZE 33 |
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#define GSM_FRAME_SIZE 160 |
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static int libgsm_init(AVCodecContext *avctx) { |
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if (avctx->channels > 1 || avctx->sample_rate != 8000) |
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return -1; |
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avctx->frame_size = GSM_FRAME_SIZE; |
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avctx->block_align = GSM_BLOCK_SIZE; |
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avctx->priv_data = gsm_create(); |
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avctx->coded_frame= avcodec_alloc_frame(); |
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avctx->coded_frame->key_frame= 1; |
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return 0; |
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} |
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static int libgsm_close(AVCodecContext *avctx) { |
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gsm_destroy(avctx->priv_data); |
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avctx->priv_data = NULL; |
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return 0; |
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} |
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static int libgsm_encode_frame(AVCodecContext *avctx, |
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unsigned char *frame, int buf_size, void *data) { |
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// we need a full block
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if(buf_size < GSM_BLOCK_SIZE) return 0; |
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gsm_encode(avctx->priv_data,data,frame); |
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return GSM_BLOCK_SIZE; |
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} |
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AVCodec libgsm_encoder = { |
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"gsm", |
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CODEC_TYPE_AUDIO, |
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CODEC_ID_GSM, |
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0, |
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libgsm_init, |
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libgsm_encode_frame, |
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libgsm_close, |
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}; |
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static int libgsm_decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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uint8_t *buf, int buf_size) { |
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if(buf_size < GSM_BLOCK_SIZE) return 0; |
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if(gsm_decode(avctx->priv_data,buf,data)) return -1; |
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*data_size = GSM_FRAME_SIZE*2; |
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return GSM_BLOCK_SIZE; |
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} |
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AVCodec libgsm_decoder = { |
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"gsm", |
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CODEC_TYPE_AUDIO, |
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CODEC_ID_GSM, |
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0, |
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libgsm_init, |
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NULL, |
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libgsm_close, |
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libgsm_decode_frame, |
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}; |
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