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https://github.com/librempeg/librempeg
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aab2db9229
This commit does for AVInputFormat what commit59c9dc82f4did for AVOutputFormat: It adds a new type FFInputFormat, moves all the internals of AVInputFormat to it and adds a now reduced AVInputFormat as first member. This does not affect/improve extensibility of both public or private fields for demuxers (it is still a mess due to lavd). This is possible since50f34172e0(which removed the last usage of an internal field of AVInputFormat in fftools). (Hint: tools/probetest.c accesses the internals of FFInputFormat as well, but given that it is a testing tool this is not considered a problem.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com> Signed-off-by: Paul B Mahol <onemda@gmail.com>
119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
/*
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* Copyright (c) 2009 Michael Niedermayer
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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 "avformat.h"
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#include "demux.h"
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#include "internal.h"
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static int probe(const AVProbeData *p)
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{
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// the single file I have starts with that, I do not know if others do, too
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if( p->buf[0] == 1
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&& p->buf[1] == 1
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&& p->buf[2] == 3
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&& p->buf[3] == 0xB8
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&& p->buf[4] == 0x80
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&& p->buf[5] == 0x60
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)
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return AVPROBE_SCORE_MAX-2;
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return 0;
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}
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static int read_header(AVFormatContext *s)
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{
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AVStream *st;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_MPEG4;
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ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
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avpriv_set_pts_info(st, 64, 1, 90000);
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return 0;
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}
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static int read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, size, pts, type, flags;
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int first_pkt = 0;
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int frame_complete = 0;
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while (!frame_complete) {
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type = avio_rb16(s->pb); // 257 or 258
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size = avio_rb16(s->pb);
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flags = avio_rb16(s->pb); //some flags, 0x80 indicates end of frame
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avio_rb16(s->pb); //packet number
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pts = avio_rb32(s->pb);
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avio_rb32(s->pb); //6A 13 E3 88
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frame_complete = flags & 0x80;
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size -= 12;
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if (size < 1)
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return -1;
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if (type == 258) {
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avio_skip(s->pb, size);
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frame_complete = 0;
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continue;
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}
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if (!first_pkt) {
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ret = av_get_packet(s->pb, pkt, size);
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if (ret < 0)
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return ret;
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first_pkt = 1;
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pkt->pts = pts;
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pkt->pos -= 16;
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} else {
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ret = av_append_packet(s->pb, pkt, size);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "failed to grow packet\n");
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return ret;
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}
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}
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if (ret < size) {
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av_log(s, AV_LOG_ERROR, "Truncated packet! Read %d of %d bytes\n",
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ret, size);
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pkt->flags |= AV_PKT_FLAG_CORRUPT;
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break;
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}
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}
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pkt->stream_index = 0;
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return 0;
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}
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const FFInputFormat ff_iv8_demuxer = {
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.p.name = "iv8",
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.p.long_name = NULL_IF_CONFIG_SMALL("IndigoVision 8000 video"),
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.p.flags = AVFMT_GENERIC_INDEX,
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.read_probe = probe,
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.read_header = read_header,
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.read_packet = read_packet,
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};
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