| 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 | |
| 27 | typedef struct CRCState { |
| 28 | uint32_t crcval; |
| 29 | } CRCState; |
| 30 | |
| 31 | static 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 | |
| 41 | static 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 | |
| 48 | static 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 | |
| 59 | AVOutputFormat 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 | }; |