yading@11: /*
yading@11:  * Copyright (c) 2009 Michael Niedermayer
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 "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: 
yading@11: static int probe(AVProbeData *p)
yading@11: {
yading@11:     // the single file I have starts with that, I do not know if others do, too
yading@11:     if(   p->buf[0] == 1
yading@11:        && p->buf[1] == 1
yading@11:        && p->buf[2] == 3
yading@11:        && p->buf[3] == 0xB8
yading@11:        && p->buf[4] == 0x80
yading@11:        && p->buf[5] == 0x60
yading@11:       )
yading@11:         return AVPROBE_SCORE_MAX-2;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_header(AVFormatContext *s)
yading@11: {
yading@11:     AVStream *st;
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     st->codec->codec_id = AV_CODEC_ID_MPEG4;
yading@11:     st->need_parsing = AVSTREAM_PARSE_FULL;
yading@11:     avpriv_set_pts_info(st, 64, 1, 90000);
yading@11: 
yading@11:     return 0;
yading@11: 
yading@11: }
yading@11: 
yading@11: static int read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     int ret, size, pts, type, flags;
yading@11:     int first_pkt      = 0;
yading@11:     int frame_complete = 0;
yading@11: 
yading@11:     while (!frame_complete) {
yading@11: 
yading@11:         type  = avio_rb16(s->pb); // 257 or 258
yading@11:         size  = avio_rb16(s->pb);
yading@11:         flags = avio_rb16(s->pb); //some flags, 0x80 indicates end of frame
yading@11:                 avio_rb16(s->pb); //packet number
yading@11:         pts   = avio_rb32(s->pb);
yading@11:                 avio_rb32(s->pb); //6A 13 E3 88
yading@11: 
yading@11:         frame_complete = flags & 0x80;
yading@11: 
yading@11:         size -= 12;
yading@11:         if (size < 1)
yading@11:             return -1;
yading@11: 
yading@11:         if (type == 258) {
yading@11:             avio_skip(s->pb, size);
yading@11:             frame_complete = 0;
yading@11:             continue;
yading@11:         }
yading@11: 
yading@11:         if (!first_pkt) {
yading@11:             ret = av_get_packet(s->pb, pkt, size);
yading@11:             if (ret < 0)
yading@11:                 return ret;
yading@11:             first_pkt = 1;
yading@11:             pkt->pts  = pts;
yading@11:             pkt->pos -= 16;
yading@11:         } else {
yading@11:             ret = av_append_packet(s->pb, pkt, size);
yading@11:             if (ret < 0) {
yading@11:                 av_log(s, AV_LOG_ERROR, "failed to grow packet\n");
yading@11:                 av_free_packet(pkt);
yading@11:                 return ret;
yading@11:             }
yading@11:         }
yading@11:         if (ret < size) {
yading@11:             av_log(s, AV_LOG_ERROR, "Truncated packet! Read %d of %d bytes\n",
yading@11:                    ret, size);
yading@11:             pkt->flags |= AV_PKT_FLAG_CORRUPT;
yading@11:             break;
yading@11:         }
yading@11:     }
yading@11:     pkt->stream_index = 0;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_iv8_demuxer = {
yading@11:     .name           = "iv8",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("IndigoVision 8000 video"),
yading@11:     .read_probe     = probe,
yading@11:     .read_header    = read_header,
yading@11:     .read_packet    = read_packet,
yading@11:     .flags          = AVFMT_GENERIC_INDEX,
yading@11: };