1/* 2 * CRC encoder (for codec/format testing) 3 * Copyright (c) 2002 Fabrice Bellard 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include <inttypes.h> 23 24#include "libavutil/adler32.h" 25#include "avformat.h" 26 27typedef struct CRCState { 28 uint32_t crcval; 29} CRCState; 30 31static int crc_write_header(struct AVFormatContext *s) 32{ 33 CRCState *crc = s->priv_data; 34 35 /* init CRC */ 36 crc->crcval = 1; 37 38 return 0; 39} 40 41static int crc_write_packet(struct AVFormatContext *s, AVPacket *pkt) 42{ 43 CRCState *crc = s->priv_data; 44 crc->crcval = av_adler32_update(crc->crcval, pkt->data, pkt->size); 45 return 0; 46} 47 48static int crc_write_trailer(struct AVFormatContext *s) 49{ 50 CRCState *crc = s->priv_data; 51 char buf[64]; 52 53 snprintf(buf, sizeof(buf), "CRC=0x%08"PRIx32"\n", crc->crcval); 54 avio_write(s->pb, buf, strlen(buf)); 55 56 return 0; 57} 58 59AVOutputFormat ff_crc_muxer = { 60 .name = "crc", 61 .long_name = NULL_IF_CONFIG_SMALL("CRC testing"), 62 .priv_data_size = sizeof(CRCState), 63 .audio_codec = AV_CODEC_ID_PCM_S16LE, 64 .video_codec = AV_CODEC_ID_RAWVIDEO, 65 .write_header = crc_write_header, 66 .write_packet = crc_write_packet, 67 .write_trailer = crc_write_trailer, 68 .flags = AVFMT_NOTIMESTAMPS, 69}; 70