On2 IVF demuxer

Originally committed as revision 23357 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 91 insertions, 0 deletions

diff --git a/libavformat/ivfdec.c b/libavformat/ivfdec.c
new file mode 100644
index 0000000000..9baa3ec20e
--- /dev/null
+++ b/libavformat/ivfdec.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2010 David Conrad
+ *
+ * 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 "avformat.h"
+#include "riff.h"
+#include "libavutil/intreadwrite.h"
+
+static int probe(AVProbeData *p)
+{
+    if (AV_RL32(p->buf) == MKTAG('D','K','I','F')
+        && !AV_RL16(p->buf+4) && AV_RL16(p->buf+6) == 32)
+        return AVPROBE_SCORE_MAX-2;
+
+    return 0;
+}
+
+static int read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    AVStream *st;
+    AVRational time_base;
+
+    get_le32(s->pb); // DKIF
+    get_le16(s->pb); // version
+    get_le16(s->pb); // header size
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+
+    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_tag  = get_le32(s->pb);
+    st->codec->codec_id   = ff_codec_get_id(ff_codec_bmp_tags, st->codec->codec_tag);
+    st->codec->width      = get_le16(s->pb);
+    st->codec->height     = get_le16(s->pb);
+    time_base.den         = get_le32(s->pb);
+    time_base.num         = get_le32(s->pb);
+    st->duration          = get_le64(s->pb);
+
+    st->need_parsing      = AVSTREAM_PARSE_HEADERS;
+
+    if (!time_base.den || !time_base.num) {
+        av_log(s, AV_LOG_ERROR, "Invalid frame rate\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    av_set_pts_info(st, 64, time_base.num, time_base.den);
+
+    return 0;
+}
+
+static int read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret, size = get_le32(s->pb);
+    int64_t   pts = get_le64(s->pb);
+
+    ret = av_get_packet(s->pb, pkt, size);
+    pkt->stream_index = 0;
+    pkt->pts          = pts;
+    pkt->pos         -= 12;
+
+    return ret;
+}
+
+AVInputFormat ivf_demuxer = {
+    "ivf",
+    NULL_IF_CONFIG_SMALL("On2 IVF"),
+    0,
+    probe,
+    read_header,
+    read_packet,
+    .flags= AVFMT_GENERIC_INDEX,
+    .codec_tag = (const AVCodecTag*[]){ff_codec_bmp_tags, 0},
+};