| /* |
| * 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 "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%08x\n", crc->crcval); |
| put_buffer(s->pb, buf, strlen(buf)); |
| put_flush_packet(s->pb); |
| return 0; |
| } |
| |
| AVOutputFormat crc_muxer = { |
| "crc", |
| NULL_IF_CONFIG_SMALL("CRC testing format"), |
| NULL, |
| "", |
| sizeof(CRCState), |
| CODEC_ID_PCM_S16LE, |
| CODEC_ID_RAWVIDEO, |
| crc_write_header, |
| crc_write_packet, |
| crc_write_trailer, |
| }; |