| /* |
| * VC1 Test Bitstreams Format Demuxer |
| * Copyright (c) 2006, 2008 Konstantin Shishkov |
| * |
| * 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 |
| */ |
| |
| /** |
| * @file libavformat/vc1test.c |
| * VC1 test bitstream file demuxer |
| * by Konstantin Shishkov |
| * Format specified in SMPTE standard 421 Annex L |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| |
| #define VC1_EXTRADATA_SIZE 4 |
| |
| static int vc1t_probe(AVProbeData *p) |
| { |
| if (p->buf[3] != 0xC5 && AV_RL32(&p->buf[4]) != 4) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX/2; |
| } |
| |
| static int vc1t_read_header(AVFormatContext *s, |
| AVFormatParameters *ap) |
| { |
| ByteIOContext *pb = s->pb; |
| AVStream *st; |
| int fps, frames; |
| |
| frames = get_le24(pb); |
| if(get_byte(pb) != 0xC5 || get_le32(pb) != 4) |
| return -1; |
| |
| /* init video codec */ |
| st = av_new_stream(s, 0); |
| if (!st) |
| return -1; |
| |
| st->codec->codec_type = CODEC_TYPE_VIDEO; |
| st->codec->codec_id = CODEC_ID_WMV3; |
| |
| st->codec->extradata = av_malloc(VC1_EXTRADATA_SIZE); |
| st->codec->extradata_size = VC1_EXTRADATA_SIZE; |
| get_buffer(pb, st->codec->extradata, VC1_EXTRADATA_SIZE); |
| st->codec->height = get_le32(pb); |
| st->codec->width = get_le32(pb); |
| if(get_le32(pb) != 0xC) |
| return -1; |
| url_fskip(pb, 8); |
| fps = get_le32(pb); |
| if(fps == -1) |
| av_set_pts_info(st, 32, 1, 1000); |
| else{ |
| av_set_pts_info(st, 24, 1, fps); |
| st->duration = frames; |
| } |
| |
| return 0; |
| } |
| |
| static int vc1t_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| ByteIOContext *pb = s->pb; |
| int frame_size; |
| int keyframe = 0; |
| uint32_t pts; |
| |
| if(url_feof(pb)) |
| return AVERROR(EIO); |
| |
| frame_size = get_le24(pb); |
| if(get_byte(pb) & 0x80) |
| keyframe = 1; |
| pts = get_le32(pb); |
| if(av_get_packet(pb, pkt, frame_size) < 0) |
| return AVERROR(EIO); |
| if(s->streams[0]->time_base.den == 1000) |
| pkt->pts = pts; |
| pkt->flags |= keyframe ? PKT_FLAG_KEY : 0; |
| pkt->pos -= 8; |
| |
| return pkt->size; |
| } |
| |
| AVInputFormat vc1t_demuxer = { |
| "vc1test", |
| NULL_IF_CONFIG_SMALL("VC-1 test bitstream format"), |
| 0, |
| vc1t_probe, |
| vc1t_read_header, |
| vc1t_read_packet, |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |