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* CRC decoder (for codec/format testing)
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* Copyright (c) 2002 Fabrice Bellard.
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* This file is part of FFmpeg.
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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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* 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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* 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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#ifdef CONFIG_CRC_MUXER
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typedef struct CRCState {
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static int crc_write_header(struct AVFormatContext *s)
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CRCState *crc = s->priv_data;
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static int crc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
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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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static int crc_write_trailer(struct AVFormatContext *s)
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CRCState *crc = s->priv_data;
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snprintf(buf, sizeof(buf), "CRC=0x%08x\n", crc->crcval);
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put_buffer(&s->pb, buf, strlen(buf));
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put_flush_packet(&s->pb);
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#ifdef CONFIG_FRAMECRC_MUXER
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static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
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uint32_t crc = av_adler32_update(0, pkt->data, pkt->size);
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snprintf(buf, sizeof(buf), "%d, %"PRId64", %d, 0x%08x\n", pkt->stream_index, pkt->dts, pkt->size, crc);
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put_buffer(&s->pb, buf, strlen(buf));
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put_flush_packet(&s->pb);
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#ifdef CONFIG_CRC_MUXER
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AVOutputFormat crc_muxer = {
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#ifdef CONFIG_FRAMECRC_MUXER
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AVOutputFormat framecrc_muxer = {
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"framecrc testing format",
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framecrc_write_packet,