SMPTE 421 Annex L format demuxer

Originally committed as revision 11661 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 112 insertions, 0 deletions

diff --git a/libavformat/vc1test.c b/libavformat/vc1test.c
new file mode 100644
index 0000000000..c8340179cf
--- /dev/null
+++ b/libavformat/vc1test.c
@@ -0,0 +1,112 @@
+/*
+ * VC1 Test Bitstreams Format Demuxer
+ * Copyright (c) 2006, 2008 Konstantin Shishkov
+ *
+ * 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
+ */
+
+/**
+ * @file vc1test.c
+ * VC1 test bitstream file demuxer
+ * by Konstantin Shishkov
+ * Format specified in SMPTE standard 421 Annex L
+ */
+
+#include "avformat.h"
+
+#define VC1_EXTRADATA_SIZE 4
+
+static int vc1t_probe(AVProbeData *p)
+{
+    if (p->buf[3] != 0xC5 && AV_RL32(&p->buf[4]) != 4)
+        return 0;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int vc1t_read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)
+{
+    ByteIOContext *pb = s->pb;
+    AVStream *st;
+    int fps, frames;
+
+    frames = get_le24(pb);
+    if(get_byte(pb) != 0xC5 || get_le32(pb) != 4)
+        return -1;
+
+    /* init video codec */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return -1;
+
+    st->codec->codec_type = CODEC_TYPE_VIDEO;
+    st->codec->codec_id = CODEC_ID_WMV3;
+
+    st->codec->extradata = av_malloc(VC1_EXTRADATA_SIZE);
+    st->codec->extradata_size = VC1_EXTRADATA_SIZE;
+    get_buffer(pb, st->codec->extradata, VC1_EXTRADATA_SIZE);
+    st->codec->height = get_le32(pb);
+    st->codec->width = get_le32(pb);
+    if(get_le32(pb) != 0xC)
+        return -1;
+    url_fskip(pb, 8);
+    fps = get_le32(pb);
+    if(fps == -1)
+        av_set_pts_info(st, 32, 1, 1000);
+    else{
+        av_set_pts_info(st, 24, 1, fps);
+        st->duration = frames;
+    }
+
+    return 0;
+}
+
+static int vc1t_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    ByteIOContext *pb = s->pb;
+    int frame_size;
+    int keyframe = 0;
+    uint32_t pts;
+
+    if(url_feof(pb))
+        return AVERROR(EIO);
+
+    frame_size = get_le24(pb);
+    if(get_byte(pb) & 0x80)
+        keyframe = 1;
+    pts = get_le32(pb);
+    if(av_get_packet(pb, pkt, frame_size) < 0)
+        return AVERROR(EIO);
+    if(s->streams[0]->time_base.den == 1000)
+        pkt->pts = pts;
+    pkt->flags |= keyframe ? PKT_FLAG_KEY : 0;
+    pkt->pos -= 8;
+
+    return pkt->size;
+}
+
+AVInputFormat vc1t_demuxer = {
+    "vc1test",
+    "VC1 test bitstream format",
+    0,
+    vc1t_probe,
+    vc1t_read_header,
+    vc1t_read_packet,
+    .flags = AVFMT_GENERIC_INDEX,
+};