From 0f3444e17ce2846e103ecbaaeb777f791a698760 Mon Sep 17 00:00:00 2001 From: Ramiro Polla Date: Tue, 18 Mar 2008 19:54:47 +0000 Subject: MSN TCP Webcam stream demuxer. Originally committed as revision 12492 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/msnwc_tcp.c | 140 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 140 insertions(+) create mode 100644 libavformat/msnwc_tcp.c (limited to 'libavformat/msnwc_tcp.c') diff --git a/libavformat/msnwc_tcp.c b/libavformat/msnwc_tcp.c new file mode 100644 index 0000000000..05e44b27c0 --- /dev/null +++ b/libavformat/msnwc_tcp.c @@ -0,0 +1,140 @@ +/* + * Copyright (C) 2008 Ramiro Polla + * + * 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" +#include "bytestream.h" + +#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; + + for(i = 0 ; i + HEADER_SIZE <= p->buf_size ; i++) { + uint16_t width, height; + uint32_t fourcc; + const uint8_t *bytestream = p->buf+i; + + if(bytestream_get_le16(&bytestream) != HEADER_SIZE) + continue; + width = bytestream_get_le16(&bytestream); + height = bytestream_get_le16(&bytestream); + if(!(width==320 && height==240) && !(width==160 && height==120)) + continue; + bytestream += 2; // keyframe + bytestream += 4; // size + fourcc = bytestream_get_le32(&bytestream); + if(fourcc != MKTAG('M', 'L', '2', '0')) + continue; + + if(i) { + if(i < 14) /* starts with SwitchBoard connection info */ + return AVPROBE_SCORE_MAX / 2; + else /* starts in the middle of stream */ + return AVPROBE_SCORE_MAX / 3; + } else { + return AVPROBE_SCORE_MAX; + } + } + + return -1; +} + +static int msnwc_tcp_read_header(AVFormatContext *ctx, AVFormatParameters *ap) +{ + ByteIOContext *pb = ctx->pb; + AVCodecContext *codec; + AVStream *st; + + st = av_new_stream(ctx, 0); + if(!st) + return AVERROR_NOMEM; + + codec = st->codec; + codec->codec_type = CODEC_TYPE_VIDEO; + codec->codec_id = CODEC_ID_MIMIC; + codec->codec_tag = MKTAG('M', 'L', '2', '0'); + + av_set_pts_info(st, 32, 1, 1000); + + /* Some files start with "connected\r\n\r\n". + * So skip until we find the first byte of struct size */ + while(get_byte(pb) != HEADER_SIZE && !url_feof(pb)); + + if(url_feof(pb)) { + av_log(ctx, AV_LOG_ERROR, "Could not find valid start."); + return -1; + } + + return 0; +} + +static int msnwc_tcp_read_packet(AVFormatContext *ctx, AVPacket *pkt) +{ + ByteIOContext *pb = ctx->pb; + uint16_t keyframe; + uint32_t size, timestamp; + + url_fskip(pb, 1); /* one byte has been read ahead */ + url_fskip(pb, 2); + url_fskip(pb, 2); + keyframe = get_le16(pb); + size = get_le32(pb); + url_fskip(pb, 4); + url_fskip(pb, 4); + timestamp = get_le32(pb); + + if(!size || av_get_packet(pb, pkt, size) != size) + return -1; + + url_fskip(pb, 1); /* Read ahead one byte of struct size like read_header */ + + pkt->pts = timestamp; + pkt->dts = timestamp; + 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 */ + if(keyframe&1) + pkt->flags |= PKT_FLAG_KEY; + + return HEADER_SIZE + size; +} + +AVInputFormat msnwc_tcp_demuxer = { + "msnwctcp", + "MSN TCP Webcam stream", + 0, + msnwc_tcp_probe, + msnwc_tcp_read_header, + msnwc_tcp_read_packet, +}; -- cgit v1.2.3