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ffmpeg / libavformat / crcenc.c @ 2912e87a

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/*
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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 Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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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    "crc",
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    NULL_IF_CONFIG_SMALL("CRC testing format"),
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    NULL,
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    "",
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    sizeof(CRCState),
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    CODEC_ID_PCM_S16LE,
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    CODEC_ID_RAWVIDEO,
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    crc_write_header,
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    crc_write_packet,
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    crc_write_trailer,
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};