mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
118 lines
3.2 KiB
118 lines
3.2 KiB
/* |
|
* Copyright (c) 2009 Michael Niedermayer |
|
* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU Lesser General Public |
|
* License as published by the Free Software Foundation; either |
|
* version 2.1 of the License, or (at your option) any later version. |
|
* |
|
* FFmpeg is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
* Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public |
|
* License along with FFmpeg; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#include "avformat.h" |
|
|
|
|
|
static int probe(AVProbeData *p) |
|
{ |
|
// the single file i have starts with that, i dont know if others do too |
|
if( p->buf[0] == 1 |
|
&& p->buf[1] == 1 |
|
&& p->buf[2] == 3 |
|
&& p->buf[3] == 0xB8 |
|
&& p->buf[4] == 0x80 |
|
&& p->buf[5] == 0x60 |
|
) |
|
return AVPROBE_SCORE_MAX-2; |
|
|
|
return 0; |
|
} |
|
|
|
static int read_header(AVFormatContext *s, AVFormatParameters *ap) |
|
{ |
|
AVStream *st; |
|
|
|
st = avformat_new_stream(s, NULL); |
|
if (!st) |
|
return AVERROR(ENOMEM); |
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
|
st->codec->codec_id = CODEC_ID_MPEG4; |
|
st->need_parsing = AVSTREAM_PARSE_FULL; |
|
av_set_pts_info(st, 64, 1, 90000); |
|
|
|
return 0; |
|
|
|
} |
|
|
|
static int read_packet(AVFormatContext *s, AVPacket *pkt) |
|
{ |
|
int ret, size, pts, type, flags; |
|
int first_pkt = 0; |
|
int frame_complete = 0; |
|
|
|
while (!frame_complete) { |
|
|
|
type = avio_rb16(s->pb); // 257 or 258 |
|
size = avio_rb16(s->pb); |
|
flags = avio_rb16(s->pb); //some flags, 0x80 indicates end of frame |
|
avio_rb16(s->pb); //packet number |
|
pts = avio_rb32(s->pb); |
|
avio_rb32(s->pb); //6A 13 E3 88 |
|
|
|
frame_complete = flags & 0x80; |
|
|
|
size -= 12; |
|
if (size < 1) |
|
return -1; |
|
|
|
if (type == 258) { |
|
avio_skip(s->pb, size); |
|
frame_complete = 0; |
|
continue; |
|
} |
|
|
|
if (!first_pkt) { |
|
ret = av_get_packet(s->pb, pkt, size); |
|
if (ret < 0) |
|
return ret; |
|
first_pkt = 1; |
|
pkt->pts = pts; |
|
pkt->pos -= 16; |
|
} else { |
|
ret = av_append_packet(s->pb, pkt, size); |
|
if (ret < 0) { |
|
av_log(s, AV_LOG_ERROR, "failed to grow packet\n"); |
|
av_free_packet(pkt); |
|
return ret; |
|
} |
|
} |
|
if (ret < size) { |
|
av_log(s, AV_LOG_ERROR, "Truncated packet! Read %d of %d bytes\n", |
|
ret, size); |
|
pkt->flags |= AV_PKT_FLAG_CORRUPT; |
|
break; |
|
} |
|
} |
|
pkt->stream_index = 0; |
|
|
|
return 0; |
|
} |
|
|
|
AVInputFormat ff_iv8_demuxer = { |
|
.name = "iv8", |
|
.long_name = NULL_IF_CONFIG_SMALL("A format generated by IndigoVision 8000 video server"), |
|
.read_probe = probe, |
|
.read_header = read_header, |
|
.read_packet = read_packet, |
|
.flags= AVFMT_GENERIC_INDEX, |
|
.value = CODEC_ID_MPEG4, |
|
};
|
|
|