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Sat, 12 Sep 2020 02:28:42 -0700 (PDT) Received: from localhost.localdomain ([94.250.162.52]) by smtp.gmail.com with ESMTPSA id y14sm2953844eje.10.2020.09.12.02.28.41 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 12 Sep 2020 02:28:41 -0700 (PDT) From: Paul B Mahol To: ffmpeg-devel@ffmpeg.org Date: Sat, 12 Sep 2020 11:28:33 +0200 Message-Id: <20200912092833.30131-1-onemda@gmail.com> X-Mailer: git-send-email 2.17.1 Subject: [FFmpeg-devel] [PATCH] avformat: add DAT CCTV demuxer X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Signed-off-by: Paul B Mahol --- libavformat/Makefile | 1 + libavformat/allformats.c | 1 + libavformat/luodatdec.c | 129 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 131 insertions(+) create mode 100644 libavformat/luodatdec.c diff --git a/libavformat/Makefile b/libavformat/Makefile index 5ce1e6464d..b4cc467268 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -292,6 +292,7 @@ OBJS-$(CONFIG_KVAG_MUXER) += kvag.o rawenc.o OBJS-$(CONFIG_LATM_MUXER) += latmenc.o rawenc.o OBJS-$(CONFIG_LMLM4_DEMUXER) += lmlm4.o OBJS-$(CONFIG_LOAS_DEMUXER) += loasdec.o rawdec.o +OBJS-$(CONFIG_LUODAT_DEMUXER) += luodatdec.o OBJS-$(CONFIG_LRC_DEMUXER) += lrcdec.o lrc.o subtitles.o OBJS-$(CONFIG_LRC_MUXER) += lrcenc.o lrc.o OBJS-$(CONFIG_LVF_DEMUXER) += lvfdec.o diff --git a/libavformat/allformats.c b/libavformat/allformats.c index 82838e3c53..a23eb9e7fa 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -226,6 +226,7 @@ extern AVOutputFormat ff_kvag_muxer; extern AVOutputFormat ff_latm_muxer; extern AVInputFormat ff_lmlm4_demuxer; extern AVInputFormat ff_loas_demuxer; +extern AVInputFormat ff_luodat_demuxer; extern AVInputFormat ff_lrc_demuxer; extern AVOutputFormat ff_lrc_muxer; extern AVInputFormat ff_lvf_demuxer; diff --git a/libavformat/luodatdec.c b/libavformat/luodatdec.c new file mode 100644 index 0000000000..939c7f63b5 --- /dev/null +++ b/libavformat/luodatdec.c @@ -0,0 +1,129 @@ +/* + * 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, " oul", 4)) + return 0; + + if (memcmp(p->buf + 0x2000, "liu ", 4)) + 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 DAT"), + .read_probe = dat_probe, + .read_header = dat_read_header, + .read_packet = dat_read_packet, + .extensions = "dat", + .flags = AVFMT_GENERIC_INDEX, +};