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112 lines
2.8 KiB
112 lines
2.8 KiB
/* |
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* VC1 Test Bitstreams Format Demuxer |
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* Copyright (c) 2006, 2008 Konstantin Shishkov |
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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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/** |
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* @file vc1test.c |
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* VC1 test bitstream file demuxer |
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* by Konstantin Shishkov |
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* Format specified in SMPTE standard 421 Annex L |
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*/ |
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#include "avformat.h" |
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#define VC1_EXTRADATA_SIZE 4 |
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static int vc1t_probe(AVProbeData *p) |
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{ |
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if (p->buf[3] != 0xC5 && AV_RL32(&p->buf[4]) != 4) |
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return 0; |
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return AVPROBE_SCORE_MAX; |
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} |
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static int vc1t_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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ByteIOContext *pb = s->pb; |
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AVStream *st; |
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int fps, frames; |
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frames = get_le24(pb); |
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if(get_byte(pb) != 0xC5 || get_le32(pb) != 4) |
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return -1; |
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/* init video codec */ |
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st = av_new_stream(s, 0); |
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if (!st) |
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return -1; |
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st->codec->codec_type = CODEC_TYPE_VIDEO; |
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st->codec->codec_id = CODEC_ID_WMV3; |
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st->codec->extradata = av_malloc(VC1_EXTRADATA_SIZE); |
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st->codec->extradata_size = VC1_EXTRADATA_SIZE; |
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get_buffer(pb, st->codec->extradata, VC1_EXTRADATA_SIZE); |
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st->codec->height = get_le32(pb); |
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st->codec->width = get_le32(pb); |
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if(get_le32(pb) != 0xC) |
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return -1; |
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url_fskip(pb, 8); |
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fps = get_le32(pb); |
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if(fps == -1) |
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av_set_pts_info(st, 32, 1, 1000); |
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else{ |
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av_set_pts_info(st, 24, 1, fps); |
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st->duration = frames; |
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} |
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return 0; |
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} |
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static int vc1t_read_packet(AVFormatContext *s, |
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AVPacket *pkt) |
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{ |
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ByteIOContext *pb = s->pb; |
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int frame_size; |
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int keyframe = 0; |
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uint32_t pts; |
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if(url_feof(pb)) |
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return AVERROR(EIO); |
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frame_size = get_le24(pb); |
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if(get_byte(pb) & 0x80) |
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keyframe = 1; |
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pts = get_le32(pb); |
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if(av_get_packet(pb, pkt, frame_size) < 0) |
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return AVERROR(EIO); |
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if(s->streams[0]->time_base.den == 1000) |
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pkt->pts = pts; |
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pkt->flags |= keyframe ? PKT_FLAG_KEY : 0; |
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pkt->pos -= 8; |
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return pkt->size; |
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} |
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AVInputFormat vc1t_demuxer = { |
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"vc1test", |
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"VC1 test bitstream format", |
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0, |
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vc1t_probe, |
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vc1t_read_header, |
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vc1t_read_packet, |
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.flags = AVFMT_GENERIC_INDEX, |
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};
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