[FFmpeg-devel] [PATCH] oggdec: add support for VP8 demuxing

[James Almer]

Signed-off-by: James Almer <jamrial at gmail.com>
---
 Changelog                 |   1 +
 libavformat/Makefile      |   1 +
 libavformat/oggdec.c      |   1 +
 libavformat/oggdec.h      |   1 +
 libavformat/oggparsevp8.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 118 insertions(+)
 create mode 100644 libavformat/oggparsevp8.c

diff --git a/Changelog b/Changelog
index df00e64..6208fe7 100644
--- a/Changelog
+++ b/Changelog
@@ -13,6 +13,7 @@ version <next>
 - remove mp3_header_compress bitstream filters
 - Windows resource files for shared libraries
 - aeval filter
+- VP8 in Ogg demuxing
 
 
 version 2.1:
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 6801782..0003921 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -263,6 +263,7 @@ OBJS-$(CONFIG_OGG_DEMUXER)               += oggdec.o         \
                                             oggparsespeex.o  \
                                             oggparsetheora.o \
                                             oggparsevorbis.o \
+                                            oggparsevp8.o \
                                             vorbiscomment.o  \
                                             flac_picture.o
 OBJS-$(CONFIG_OGG_MUXER)                 += oggenc.o \
diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c
index a099eb3..af7ccd9 100644
--- a/libavformat/oggdec.c
+++ b/libavformat/oggdec.c
@@ -48,6 +48,7 @@ static const struct ogg_codec * const ogg_codecs[] = {
     &ff_flac_codec,
     &ff_celt_codec,
     &ff_opus_codec,
+    &ff_vp8_codec,
     &ff_old_dirac_codec,
     &ff_old_flac_codec,
     &ff_ogm_video_codec,
diff --git a/libavformat/oggdec.h b/libavformat/oggdec.h
index c31859f..c6214b3 100644
--- a/libavformat/oggdec.h
+++ b/libavformat/oggdec.h
@@ -125,6 +125,7 @@ extern const struct ogg_codec ff_skeleton_codec;
 extern const struct ogg_codec ff_speex_codec;
 extern const struct ogg_codec ff_theora_codec;
 extern const struct ogg_codec ff_vorbis_codec;
+extern const struct ogg_codec ff_vp8_codec;
 
 int ff_vorbis_comment(AVFormatContext *ms, AVDictionary **m, const uint8_t *buf, int size);
 
diff --git a/libavformat/oggparsevp8.c b/libavformat/oggparsevp8.c
new file mode 100644
index 0000000..a2b776e
--- /dev/null
+++ b/libavformat/oggparsevp8.c
@@ -0,0 +1,114 @@
+/*
+ * On2 VP8 parser for Ogg
+ * Copyright (C) 2013 James Almer
+ *
+ * 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 "internal.h"
+#include "oggdec.h"
+
+#define VP8_HEADER_SIZE 26
+
+static int vp8_header(AVFormatContext *s, int idx)
+{
+    struct ogg *ogg = s->priv_data;
+    struct ogg_stream *os = ogg->streams + idx;
+    uint8_t *p = os->buf + os->pstart;
+    AVStream *st = s->streams[idx];
+    AVRational framerate;
+
+    if (os->psize < 7 || p[0] != 0x4f)
+        return 0;
+
+    switch (p[5]){
+    case 0x01:
+        if (os->psize < VP8_HEADER_SIZE) {
+            av_log(s, AV_LOG_ERROR, "Invalid OggVP8 header packet");
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (p[6] != 1) {
+            av_log(s, AV_LOG_WARNING, "Unsupported OggVP8 version %d.%d\n", p[6], p[7]);
+            return -1;
+        }
+
+        st->codec->width            = AV_RB16(p +  8);
+        st->codec->height           = AV_RB16(p + 10);
+        st->sample_aspect_ratio.num = AV_RB24(p + 12);
+        st->sample_aspect_ratio.den = AV_RB24(p + 15);
+        framerate.den               = AV_RB32(p + 18);
+        framerate.num               = AV_RB32(p + 22);
+
+        avpriv_set_pts_info(st, 64, framerate.num, framerate.den);
+        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+        st->codec->codec_id   = AV_CODEC_ID_VP8;
+        st->need_parsing      = AVSTREAM_PARSE_HEADERS;
+        break;
+    case 0x02:
+        if (p[6] != 0x20)
+            return AVERROR_INVALIDDATA;
+        ff_vorbis_comment(s, &st->metadata, p + 7, os->psize - 7);
+        break;
+    default:
+        av_log(s, AV_LOG_ERROR, "Unknown VP8 header type %X\n", p[5]);
+        return AVERROR_INVALIDDATA;
+    }
+
+    return 1;
+}
+
+static int vp8_packet(AVFormatContext *s, int idx)
+{
+    struct ogg *ogg = s->priv_data;
+    struct ogg_stream *os = ogg->streams + idx;
+    uint8_t *p = os->buf + os->pstart;
+
+    if (os->psize > 0)
+        os->pduration = (p[0] >> 4) & 1;
+
+    return 0;
+}
+
+static uint64_t vp8_gptopts(AVFormatContext *s, int idx, uint64_t granule,
+                              int64_t *dts)
+{
+    struct ogg *ogg = s->priv_data;
+    struct ogg_stream *os = ogg->streams + idx;
+
+    uint64_t pts  = (granule >> 32);
+    uint32_t dist = (granule >>  3) & 0x07ffffff;
+
+    if (!dist)
+        os->pflags |= AV_PKT_FLAG_KEY;
+
+    if (dts)
+        *dts = pts;
+
+    return pts;
+}
+
+const struct ogg_codec ff_vp8_codec = {
+    .magic     = "OVP80",
+    .magicsize = 5,
+    .header    = vp8_header,
+    .packet    = vp8_packet,
+    .gptopts   = vp8_gptopts,
+    .nb_header = 1,
+};
-- 
1.8.3.2