/* * CRC encoder (for codec/format testing) * Copyright (c) 2002 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <inttypes.h> #include "libavutil/adler32.h" #include "avformat.h" typedef struct CRCState { uint32_t crcval; } CRCState; static int crc_write_header(struct AVFormatContext *s) { CRCState *crc = s->priv_data; /* init CRC */ crc->crcval = 1; return 0; } static int crc_write_packet(struct AVFormatContext *s, AVPacket *pkt) { CRCState *crc = s->priv_data; crc->crcval = av_adler32_update(crc->crcval, pkt->data, pkt->size); return 0; } static int crc_write_trailer(struct AVFormatContext *s) { CRCState *crc = s->priv_data; char buf[64]; snprintf(buf, sizeof(buf), "CRC=0x%08"PRIx32"\n", crc->crcval); avio_write(s->pb, buf, strlen(buf)); return 0; } AVOutputFormat ff_crc_muxer = { .name = "crc", .long_name = NULL_IF_CONFIG_SMALL("CRC testing"), .priv_data_size = sizeof(CRCState), .audio_codec = AV_CODEC_ID_PCM_S16LE, .video_codec = AV_CODEC_ID_RAWVIDEO, .write_header = crc_write_header, .write_packet = crc_write_packet, .write_trailer = crc_write_trailer, .flags = AVFMT_NOTIMESTAMPS, };