| /* |
| * CCTV DAT demuxer |
| * |
| * Copyright (c) 2020 Paul B Mahol |
| * |
| * 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 "libavutil/intreadwrite.h" |
| #include "avio_internal.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| static int dat_probe(const AVProbeData *p) |
| { |
| if (p->buf_size < 0x2080) |
| return 0; |
| |
| if (memcmp(p->buf, "luo ", 4)) |
| return 0; |
| |
| if (memcmp(p->buf + 0x1ffc, " oulliu ", 8)) |
| return 0; |
| |
| if (!AV_RL32(p->buf + 0x2004)) |
| return 0; |
| |
| if (memcmp(p->buf + 0x207c, " uil", 4)) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int dat_read_header(AVFormatContext *s) |
| { |
| s->ctx_flags |= AVFMTCTX_NOHEADER; |
| |
| avio_seek(s->pb, 0x2000, SEEK_SET); |
| |
| return 0; |
| } |
| |
| static int dat_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| AVIOContext *pb = s->pb; |
| int index, ret, key, stream_id, stream_index, width, height, fps, pkt_size; |
| int64_t pts, pos = avio_tell(pb); |
| |
| if (avio_feof(pb)) |
| return AVERROR_EOF; |
| |
| if (avio_rb32(pb) != MKBETAG('l', 'i', 'u', ' ')) |
| return AVERROR_INVALIDDATA; |
| stream_id = avio_rl32(pb); |
| width = avio_rl32(pb); |
| height = avio_rl32(pb); |
| fps = avio_rl32(pb); |
| avio_skip(pb, 16); |
| key = avio_rl32(pb) == 1; |
| avio_skip(pb, 4); |
| index = avio_rl32(pb); |
| avio_skip(pb, 4); |
| pts = avio_rl64(pb); |
| pkt_size = avio_rl32(pb); |
| avio_skip(pb, 64); |
| |
| if (pkt_size == 0) |
| return AVERROR_EOF; |
| |
| for (stream_index = 0; stream_index < s->nb_streams; stream_index++) { |
| if (s->streams[stream_index]->id == stream_id) |
| break; |
| } |
| |
| if (stream_index == s->nb_streams) { |
| AVStream *st = avformat_new_stream(s, NULL); |
| |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->id = stream_id; |
| st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codecpar->codec_id = AV_CODEC_ID_H264; |
| st->codecpar->width = width; |
| st->codecpar->height = height; |
| avpriv_set_pts_info(st, 64, 1, fps); |
| } |
| |
| if (index >= s->nb_streams) |
| av_log(s, AV_LOG_WARNING, "Stream index out of range.\n"); |
| |
| ret = av_get_packet(pb, pkt, pkt_size); |
| if (ret < 0) |
| return ret; |
| pkt->pos = pos; |
| pkt->pts = pts; |
| pkt->stream_index = stream_index; |
| if (key) |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| |
| return ret; |
| } |
| |
| AVInputFormat ff_luodat_demuxer = { |
| .name = "luodat", |
| .long_name = NULL_IF_CONFIG_SMALL("Video CCTV DAT"), |
| .read_probe = dat_probe, |
| .read_header = dat_read_header, |
| .read_packet = dat_read_packet, |
| .extensions = "dat", |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |