yading@11: /*
yading@11:  * CRC encoder (for codec/format testing)
yading@11:  * Copyright (c) 2002 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/adler32.h"
yading@11: #include "avformat.h"
yading@11: 
yading@11: typedef struct CRCState {
yading@11:     uint32_t crcval;
yading@11: } CRCState;
yading@11: 
yading@11: static int crc_write_header(struct AVFormatContext *s)
yading@11: {
yading@11:     CRCState *crc = s->priv_data;
yading@11: 
yading@11:     /* init CRC */
yading@11:     crc->crcval = 1;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int crc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     CRCState *crc = s->priv_data;
yading@11:     crc->crcval = av_adler32_update(crc->crcval, pkt->data, pkt->size);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int crc_write_trailer(struct AVFormatContext *s)
yading@11: {
yading@11:     CRCState *crc = s->priv_data;
yading@11:     char buf[64];
yading@11: 
yading@11:     snprintf(buf, sizeof(buf), "CRC=0x%08x\n", crc->crcval);
yading@11:     avio_write(s->pb, buf, strlen(buf));
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVOutputFormat ff_crc_muxer = {
yading@11:     .name              = "crc",
yading@11:     .long_name         = NULL_IF_CONFIG_SMALL("CRC testing"),
yading@11:     .priv_data_size    = sizeof(CRCState),
yading@11:     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
yading@11:     .video_codec       = AV_CODEC_ID_RAWVIDEO,
yading@11:     .write_header      = crc_write_header,
yading@11:     .write_packet      = crc_write_packet,
yading@11:     .write_trailer     = crc_write_trailer,
yading@11:     .flags             = AVFMT_NOTIMESTAMPS,
yading@11: };