mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 12492 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
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/*
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* Copyright (C) 2008 Ramiro Polla <ramiro@lisha.ufsc.br> |
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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 "bytestream.h" |
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#define HEADER_SIZE 24 |
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/*
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* Header structure: |
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* uint16_t ss; // struct size
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* uint16_t width; // frame width
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* uint16_t height; // frame height
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* uint16_t ff; // keyframe + some other info(???)
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* uint32_t size; // size of data
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* uint32_t fourcc; // ML20
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* uint32_t u3; // ?
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* uint32_t ts; // time
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*/ |
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static int msnwc_tcp_probe(AVProbeData *p) |
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{ |
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int i; |
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for(i = 0 ; i + HEADER_SIZE <= p->buf_size ; i++) { |
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uint16_t width, height; |
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uint32_t fourcc; |
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const uint8_t *bytestream = p->buf+i; |
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if(bytestream_get_le16(&bytestream) != HEADER_SIZE) |
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continue; |
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width = bytestream_get_le16(&bytestream); |
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height = bytestream_get_le16(&bytestream); |
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if(!(width==320 && height==240) && !(width==160 && height==120)) |
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continue; |
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bytestream += 2; // keyframe
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bytestream += 4; // size
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fourcc = bytestream_get_le32(&bytestream); |
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if(fourcc != MKTAG('M', 'L', '2', '0')) |
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continue; |
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if(i) { |
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if(i < 14) /* starts with SwitchBoard connection info */ |
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return AVPROBE_SCORE_MAX / 2; |
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else /* starts in the middle of stream */ |
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return AVPROBE_SCORE_MAX / 3; |
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} else { |
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return AVPROBE_SCORE_MAX; |
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} |
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} |
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return -1; |
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} |
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static int msnwc_tcp_read_header(AVFormatContext *ctx, AVFormatParameters *ap) |
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{ |
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ByteIOContext *pb = ctx->pb; |
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AVCodecContext *codec; |
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AVStream *st; |
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st = av_new_stream(ctx, 0); |
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if(!st) |
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return AVERROR_NOMEM; |
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codec = st->codec; |
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codec->codec_type = CODEC_TYPE_VIDEO; |
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codec->codec_id = CODEC_ID_MIMIC; |
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codec->codec_tag = MKTAG('M', 'L', '2', '0'); |
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av_set_pts_info(st, 32, 1, 1000); |
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/* Some files start with "connected\r\n\r\n".
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* So skip until we find the first byte of struct size */ |
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while(get_byte(pb) != HEADER_SIZE && !url_feof(pb)); |
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if(url_feof(pb)) { |
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av_log(ctx, AV_LOG_ERROR, "Could not find valid start."); |
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return -1; |
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} |
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return 0; |
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} |
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static int msnwc_tcp_read_packet(AVFormatContext *ctx, AVPacket *pkt) |
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{ |
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ByteIOContext *pb = ctx->pb; |
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uint16_t keyframe; |
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uint32_t size, timestamp; |
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url_fskip(pb, 1); /* one byte has been read ahead */ |
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url_fskip(pb, 2); |
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url_fskip(pb, 2); |
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keyframe = get_le16(pb); |
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size = get_le32(pb); |
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url_fskip(pb, 4); |
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url_fskip(pb, 4); |
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timestamp = get_le32(pb); |
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if(!size || av_get_packet(pb, pkt, size) != size) |
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return -1; |
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url_fskip(pb, 1); /* Read ahead one byte of struct size like read_header */ |
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pkt->pts = timestamp; |
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pkt->dts = timestamp; |
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pkt->stream_index = 0; |
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/* Some aMsn generated videos (or was it Mercury Messenger?) don't set
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* this bit and rely on the codec to get keyframe information */ |
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if(keyframe&1) |
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pkt->flags |= PKT_FLAG_KEY; |
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return HEADER_SIZE + size; |
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} |
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AVInputFormat msnwc_tcp_demuxer = { |
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"msnwctcp", |
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"MSN TCP Webcam stream", |
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0, |
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msnwc_tcp_probe, |
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msnwc_tcp_read_header, |
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msnwc_tcp_read_packet, |
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}; |
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