FFmpeg: libavcodec/msgsmdec.c Source File

00001 /*
00002  * gsm 06.10 decoder, Microsoft variant
00003  * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #define BITSTREAM_READER_LE
00023 #include "avcodec.h"
00024 #include "msgsmdec.h"
00025 #include "gsm.h"
00026 #include "gsmdec_template.c"
00027 
00028 int ff_msgsm_decode_block(AVCodecContext *avctx, int16_t *samples,
00029                           const uint8_t *buf)
00030 {
00031     int res;
00032     GetBitContext gb;
00033     init_get_bits(&gb, buf, GSM_MS_BLOCK_SIZE * 8);
00034     res = gsm_decode_block(avctx, samples, &gb);
00035     if (res < 0)
00036         return res;
00037     return gsm_decode_block(avctx, samples + GSM_FRAME_SIZE, &gb);
00038 }