"Metal Gear Solid: The Twin Snakes" demuxer

Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 103 insertions, 0 deletions

diff --git a/libavformat/mgsts.c b/libavformat/mgsts.c
new file mode 100644
index 0000000000..3377d07431
--- /dev/null
+++ b/libavformat/mgsts.c
@@ -0,0 +1,103 @@
+/*
+ * Metar Gear Solid: The Twin Snakes 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 "libavutil/intfloat.h"
+#include "avformat.h"
+#include "riff.h"
+
+static int read_probe(AVProbeData *p)
+{
+    if (AV_RB32(p->buf     ) != 0x000E ||
+        AV_RB32(p->buf +  4) != 0x0050 ||
+        AV_RB32(p->buf + 12) != 0x0034)
+        return 0;
+    return AVPROBE_SCORE_MAX;
+}
+
+static int read_header(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    AVStream    *st;
+    AVRational  fps;
+    uint32_t chunk_size;
+
+    avio_skip(pb, 4);
+    chunk_size = avio_rb32(pb);
+    if (chunk_size != 80)
+        return AVERROR(EIO);
+    avio_skip(pb, 20);
+
+    st = avformat_new_stream(s, 0);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    st->start_time = 0;
+    st->nb_frames  =
+    st->duration   = avio_rb32(pb);
+    fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);
+    st->codec->width  = avio_rb32(pb);
+    st->codec->height = avio_rb32(pb);
+    avio_skip(pb, 12);
+    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_tag  = avio_rb32(pb);
+    st->codec->codec_id   = ff_codec_get_id(ff_codec_bmp_tags,
+                                            st->codec->codec_tag);
+    avpriv_set_pts_info(st, 64, fps.den, fps.num);
+    avio_skip(pb, 20);
+
+    return 0;
+}
+
+static int read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVIOContext *pb = s->pb;
+    uint32_t chunk_size, payload_size;
+    int ret;
+
+    if (url_feof(pb))
+        return AVERROR_EOF;
+
+    avio_skip(pb, 4);
+    chunk_size = avio_rb32(pb);
+    avio_skip(pb, 4);
+    payload_size = avio_rb32(pb);
+
+    if (chunk_size < payload_size + 16)
+        return AVERROR(EIO);
+
+    ret = av_get_packet(pb, pkt, payload_size);
+    if (ret < 0)
+        return ret;
+
+    pkt->duration = 1;
+    avio_skip(pb, chunk_size - (ret + 16));
+
+    return ret;
+}
+
+AVInputFormat ff_mgsts_demuxer = {
+    .name        = "mgsts",
+    .long_name   = NULL_IF_CONFIG_SMALL("Metal Gear Solid: The Twin Snakes"),
+    .read_probe  = read_probe,
+    .read_header = read_header,
+    .read_packet = read_packet,
+};