[FFmpeg-devel] [PATCH] LVF demuxer
Paul B Mahol
onemda at gmail.com
Fri Oct 19 01:33:03 CEST 2012
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
Changelog | 1 +
doc/general.texi | 1 +
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/lvfdec.c | 148 +++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 152 insertions(+)
create mode 100644 libavformat/lvfdec.c
diff --git a/Changelog b/Changelog
index 22cf813..1462801 100644
--- a/Changelog
+++ b/Changelog
@@ -14,6 +14,7 @@ version <next>:
- X-Face image encoder and decoder
- metadata (INFO tag) support in WAV muxer
- subtitles raw text decoder
+- LVF demuxer
version 1.0:
diff --git a/doc/general.texi b/doc/general.texi
index b4176d5..8ec1d28 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -232,6 +232,7 @@ library:
@tab Used by Linux Media Labs MPEG-4 PCI boards
@item LOAS @tab @tab X
@tab contains LATM multiplexed AAC audio
+ at item LVF @tab @tab X
@item LXF @tab @tab X
@tab VR native stream format, used by Leitch/Harris' video servers.
@item Matroska @tab X @tab X
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 50be0cf..dc8e271 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -151,6 +151,7 @@ OBJS-$(CONFIG_LATM_DEMUXER) += rawdec.o
OBJS-$(CONFIG_LATM_MUXER) += latmenc.o rawenc.o
OBJS-$(CONFIG_LMLM4_DEMUXER) += lmlm4.o
OBJS-$(CONFIG_LOAS_DEMUXER) += loasdec.o
+OBJS-$(CONFIG_LVF_DEMUXER) += lvfdec.o
OBJS-$(CONFIG_LXF_DEMUXER) += lxfdec.o
OBJS-$(CONFIG_M4V_DEMUXER) += m4vdec.o rawdec.o
OBJS-$(CONFIG_M4V_MUXER) += rawenc.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 00f11f4..3551394 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -133,6 +133,7 @@ void av_register_all(void)
REGISTER_MUXDEMUX (LATM, latm);
REGISTER_DEMUXER (LMLM4, lmlm4);
REGISTER_DEMUXER (LOAS, loas);
+ REGISTER_DEMUXER (LVF, lvf);
REGISTER_DEMUXER (LXF, lxf);
REGISTER_MUXDEMUX (M4V, m4v);
REGISTER_MUXER (MD5, md5);
diff --git a/libavformat/lvfdec.c b/libavformat/lvfdec.c
new file mode 100644
index 0000000..7aac6ef
--- /dev/null
+++ b/libavformat/lvfdec.c
@@ -0,0 +1,148 @@
+/*
+ * LVF demuxer
+ * Copyright (c) 2012 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 "avformat.h"
+#include "riff.h"
+
+static int lvf_probe(AVProbeData *p)
+{
+ if (AV_RL32(p->buf) == MKTAG('L', 'V', 'F', 'F'))
+ return AVPROBE_SCORE_MAX / 2;
+ return 0;
+}
+
+static int lvf_read_header(AVFormatContext *s)
+{
+ AVStream *st;
+ int64_t next_offset;
+ unsigned size, nb_streams, id;
+
+ avio_skip(s->pb, 16);
+ nb_streams = avio_rl32(s->pb);
+ if (!nb_streams)
+ return AVERROR_INVALIDDATA;
+ if (nb_streams > 2) {
+ av_log_ask_for_sample(s, "too many streams\n");
+ return AVERROR_PATCHWELCOME;
+ }
+
+ avio_skip(s->pb, 1012);
+
+ while (!url_feof(s->pb)) {
+ id = avio_rl32(s->pb);
+ size = avio_rl32(s->pb);
+ next_offset = avio_tell(s->pb) + size;
+
+ switch (id) {
+ case MKTAG('0', '0', 'f', 'm'):
+ st = avformat_new_stream(s, 0);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+ avio_skip(s->pb, 4);
+ st->codec->width = avio_rl32(s->pb);
+ st->codec->height = avio_rl32(s->pb);
+ avio_skip(s->pb, 4);
+ st->codec->codec_tag = avio_rl32(s->pb);
+ st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
+ st->codec->codec_tag);
+ avpriv_set_pts_info(st, 32, 1, 1000);
+ break;
+ case MKTAG('0', '1', 'f', 'm'):
+ st = avformat_new_stream(s, 0);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codec->codec_tag = avio_rl16(s->pb);
+ st->codec->channels = avio_rl16(s->pb);
+ st->codec->sample_rate = avio_rl16(s->pb);
+ avio_skip(s->pb, 8);
+ st->codec->bits_per_coded_sample = avio_r8(s->pb);
+ st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags,
+ st->codec->codec_tag);
+ avpriv_set_pts_info(st, 32, 1, 1000);
+ break;
+ case 0:
+ avio_seek(s->pb, 2048 + 8, SEEK_SET);
+ return 0;
+ default:
+ av_log_ask_for_sample(s, "unknown id\n");
+ return AVERROR_PATCHWELCOME;
+ }
+
+ avio_seek(s->pb, next_offset, SEEK_SET);
+ }
+
+ return AVERROR_EOF;
+}
+
+static int lvf_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ unsigned size, flags, timestamp, id;
+ int64_t pos;
+ int ret, is_video = 0;
+
+ pos = avio_tell(s->pb);
+ while (!url_feof(s->pb)) {
+ id = avio_rl32(s->pb);
+ size = avio_rl32(s->pb);
+
+ if (size == 0xFFFFFFFFu)
+ return AVERROR_EOF;
+
+ switch (id) {
+ case MKTAG('0', '0', 'd', 'c'):
+ is_video = 1;
+ case MKTAG('0', '1', 'w', 'b'):
+ if (size < 8)
+ return AVERROR_INVALIDDATA;
+ timestamp = avio_rl32(s->pb);
+ flags = avio_rl32(s->pb);
+ ret = av_get_packet(s->pb, pkt, size - 8);
+ if (flags & (1 << 12))
+ pkt->flags |= AV_PKT_FLAG_KEY;
+ pkt->stream_index = is_video ? 0 : 1;
+ pkt->pts = timestamp;
+ pkt->pos = pos;
+ return ret;
+ default:
+ ret = avio_skip(s->pb, size);
+ }
+
+ if (ret < 0)
+ return ret;
+ }
+
+ return AVERROR_EOF;
+}
+
+AVInputFormat ff_lvf_demuxer = {
+ .name = "lvf",
+ .long_name = NULL_IF_CONFIG_SMALL("LVF"),
+ .read_probe = lvf_probe,
+ .read_header = lvf_read_header,
+ .read_packet = lvf_read_packet,
+ .extensions = "lvf",
+ .flags = AVFMT_GENERIC_INDEX,
+};
--
1.7.11.2
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