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/* |
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* Copyright (C) 2008 Ramiro Polla |
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*
* 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
*/
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#include "libavcodec/bytestream.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#define HEADER_SIZE 24
/*
* Header structure:
* uint16_t ss; // struct size
* uint16_t width; // frame width
* uint16_t height; // frame height
* uint16_t ff; // keyframe + some other info(???)
* uint32_t size; // size of data
* uint32_t fourcc; // ML20
* uint32_t u3; // ?
* uint32_t ts; // time
*/
static int msnwc_tcp_probe(AVProbeData *p)
{
int i;
|
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for (i = 0; i + HEADER_SIZE <= p->buf_size; i++) { |
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uint16_t width, height;
uint32_t fourcc; |
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const uint8_t *bytestream = p->buf + i; |
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|
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if (bytestream_get_le16(&bytestream) != HEADER_SIZE) |
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continue;
width = bytestream_get_le16(&bytestream);
height = bytestream_get_le16(&bytestream); |
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if (!(width == 320 &&
height == 240) && !(width == 160 && height == 120)) |
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continue;
bytestream += 2; // keyframe
bytestream += 4; // size |
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fourcc = bytestream_get_le32(&bytestream);
if (fourcc != MKTAG('M', 'L', '2', '0')) |
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continue;
|
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if (i) {
if (i < 14) /* starts with SwitchBoard connection info */ |
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return AVPROBE_SCORE_MAX / 2;
else /* starts in the middle of stream */
return AVPROBE_SCORE_MAX / 3;
} else {
return AVPROBE_SCORE_MAX;
}
}
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return 0; |
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}
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static int msnwc_tcp_read_header(AVFormatContext *ctx) |
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{ |
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AVIOContext *pb = ctx->pb; |
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AVCodecParameters *par; |
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AVStream *st;
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st = avformat_new_stream(ctx, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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|
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par = st->codecpar;
par->codec_type = AVMEDIA_TYPE_VIDEO;
par->codec_id = AV_CODEC_ID_MIMIC;
par->codec_tag = MKTAG('M', 'L', '2', '0'); |
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|
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avpriv_set_pts_info(st, 32, 1, 1000); |
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/* Some files start with "connected\r\n\r\n".
* So skip until we find the first byte of struct size */ |
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while(avio_r8(pb) != HEADER_SIZE && !avio_feof(pb)) ; |
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|
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if(avio_feof(pb)) { |
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av_log(ctx, AV_LOG_ERROR, "Could not find valid start.\n"); |
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return AVERROR_INVALIDDATA; |
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}
return 0;
}
static int msnwc_tcp_read_packet(AVFormatContext *ctx, AVPacket *pkt)
{ |
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AVIOContext *pb = ctx->pb; |
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uint16_t keyframe;
uint32_t size, timestamp; |
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int ret; |
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|
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avio_skip(pb, 1); /* one byte has been read ahead */
avio_skip(pb, 2);
avio_skip(pb, 2); |
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keyframe = avio_rl16(pb); |
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size = avio_rl32(pb); |
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avio_skip(pb, 4);
avio_skip(pb, 4); |
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timestamp = avio_rl32(pb); |
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|
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if (!size)
return AVERROR_INVALIDDATA;
if ((ret = av_get_packet(pb, pkt, size)) < 0)
return ret; |
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|
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avio_skip(pb, 1); /* Read ahead one byte of struct size like read_header */ |
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|
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pkt->pts = timestamp;
pkt->dts = timestamp; |
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pkt->stream_index = 0;
/* Some aMsn generated videos (or was it Mercury Messenger?) don't set
* this bit and rely on the codec to get keyframe information */ |
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if (keyframe & 1) |
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pkt->flags |= AV_PKT_FLAG_KEY; |
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return HEADER_SIZE + size;
}
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AVInputFormat ff_msnwc_tcp_demuxer = { |
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.name = "msnwctcp",
.long_name = NULL_IF_CONFIG_SMALL("MSN TCP Webcam stream"),
.read_probe = msnwc_tcp_probe,
.read_header = msnwc_tcp_read_header,
.read_packet = msnwc_tcp_read_packet, |
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}; |