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libavformat/crcenc.c

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00001 /*
00002  * CRC encoder (for codec/format testing)
00003  * Copyright (c) 2002 Fabrice Bellard
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 #include "libavutil/adler32.h"
00023 #include "avformat.h"
00024 
00025 typedef struct CRCState {
00026     uint32_t crcval;
00027 } CRCState;
00028 
00029 static int crc_write_header(struct AVFormatContext *s)
00030 {
00031     CRCState *crc = s->priv_data;
00032 
00033     /* init CRC */
00034     crc->crcval = 1;
00035 
00036     return 0;
00037 }
00038 
00039 static int crc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
00040 {
00041     CRCState *crc = s->priv_data;
00042     crc->crcval = av_adler32_update(crc->crcval, pkt->data, pkt->size);
00043     return 0;
00044 }
00045 
00046 static int crc_write_trailer(struct AVFormatContext *s)
00047 {
00048     CRCState *crc = s->priv_data;
00049     char buf[64];
00050 
00051     snprintf(buf, sizeof(buf), "CRC=0x%08x\n", crc->crcval);
00052     put_buffer(s->pb, buf, strlen(buf));
00053     put_flush_packet(s->pb);
00054     return 0;
00055 }
00056 
00057 AVOutputFormat crc_muxer = {
00058     "crc",
00059     NULL_IF_CONFIG_SMALL("CRC testing format"),
00060     NULL,
00061     "",
00062     sizeof(CRCState),
00063     CODEC_ID_PCM_S16LE,
00064     CODEC_ID_RAWVIDEO,
00065     crc_write_header,
00066     crc_write_packet,
00067     crc_write_trailer,
00068 };

Generated on Fri Sep 16 2011 17:17:48 for FFmpeg by  doxygen 1.7.1