| /* |
| * 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 |
| * VC1 test bitstream file demuxer |
| * by Konstantin Shishkov |
| * Format specified in SMPTE standard 421 Annex L |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| #define VC1_EXTRADATA_SIZE 4 |
| |
| static int vc1t_probe(const AVProbeData *p) |
| { |
| uint32_t size; |
| |
| if (p->buf_size < 24) |
| return 0; |
| |
| size = AV_RL32(&p->buf[4]); |
| if (p->buf[3] != 0xC5 || size < 4 || size > p->buf_size - 20 || |
| AV_RL32(&p->buf[size+16]) != 0xC) |
| return 0; |
| |
| return AVPROBE_SCORE_EXTENSION; |
| } |
| |
| static int vc1t_read_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| AVStream *st; |
| int frames, ret; |
| uint32_t fps; |
| uint32_t size; |
| |
| frames = avio_rl24(pb); |
| if (avio_r8(pb) != 0xC5 || ((size = avio_rl32(pb)) < 4)) |
| return AVERROR_INVALIDDATA; |
| |
| /* init video codec */ |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codecpar->codec_id = AV_CODEC_ID_WMV3; |
| |
| if ((ret = ff_get_extradata(s, st->codecpar, pb, VC1_EXTRADATA_SIZE)) < 0) |
| return ret; |
| |
| avio_skip(pb, size - 4); |
| st->codecpar->height = avio_rl32(pb); |
| st->codecpar->width = avio_rl32(pb); |
| if(avio_rl32(pb) != 0xC) |
| return AVERROR_INVALIDDATA; |
| avio_skip(pb, 8); |
| fps = avio_rl32(pb); |
| if(fps == 0xFFFFFFFF) |
| avpriv_set_pts_info(st, 32, 1, 1000); |
| else{ |
| if (!fps) { |
| av_log(s, AV_LOG_ERROR, "Zero FPS specified, defaulting to 1 FPS\n"); |
| fps = 1; |
| } |
| avpriv_set_pts_info(st, 24, 1, fps); |
| st->duration = frames; |
| } |
| |
| return 0; |
| } |
| |
| static int vc1t_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| AVIOContext *pb = s->pb; |
| int frame_size; |
| int keyframe = 0; |
| uint32_t pts; |
| |
| if(avio_feof(pb)) |
| return AVERROR(EIO); |
| |
| frame_size = avio_rl24(pb); |
| if(avio_r8(pb) & 0x80) |
| keyframe = 1; |
| pts = avio_rl32(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 ? AV_PKT_FLAG_KEY : 0; |
| pkt->pos -= 8; |
| |
| return pkt->size; |
| } |
| |
| AVInputFormat ff_vc1t_demuxer = { |
| .name = "vc1test", |
| .long_name = NULL_IF_CONFIG_SMALL("VC-1 test bitstream"), |
| .read_probe = vc1t_probe, |
| .read_header = vc1t_read_header, |
| .read_packet = vc1t_read_packet, |
| .extensions = "rcv", |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |