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68 lines
2.0 KiB
68 lines
2.0 KiB
/* |
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* CRC encoder (for codec/format testing) |
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* Copyright (c) 2002 Fabrice Bellard |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/adler32.h" |
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#include "avformat.h" |
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typedef struct CRCState { |
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uint32_t crcval; |
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} CRCState; |
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static int crc_write_header(struct AVFormatContext *s) |
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{ |
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CRCState *crc = s->priv_data; |
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/* init CRC */ |
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crc->crcval = 1; |
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return 0; |
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} |
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static int crc_write_packet(struct AVFormatContext *s, AVPacket *pkt) |
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{ |
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CRCState *crc = s->priv_data; |
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crc->crcval = av_adler32_update(crc->crcval, pkt->data, pkt->size); |
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return 0; |
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} |
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static int crc_write_trailer(struct AVFormatContext *s) |
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{ |
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CRCState *crc = s->priv_data; |
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char buf[64]; |
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snprintf(buf, sizeof(buf), "CRC=0x%08x\n", crc->crcval); |
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avio_write(s->pb, buf, strlen(buf)); |
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avio_flush(s->pb); |
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return 0; |
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} |
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AVOutputFormat ff_crc_muxer = { |
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.name = "crc", |
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.long_name = NULL_IF_CONFIG_SMALL("CRC testing format"), |
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.extensions = "", |
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.priv_data_size = sizeof(CRCState), |
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.audio_codec = CODEC_ID_PCM_S16LE, |
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.video_codec = CODEC_ID_RAWVIDEO, |
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.write_header = crc_write_header, |
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.write_packet = crc_write_packet, |
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.write_trailer = crc_write_trailer, |
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.flags = AVFMT_NOTIMESTAMPS, |
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};
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