support theora in ogg, plus required ogg core changes

Originally committed as revision 4217 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 112 insertions, 0 deletions

diff --git a/libavformat/oggparsetheora.c b/libavformat/oggparsetheora.c
new file mode 100644
index 0000000000..3ca5d91da8
--- /dev/null
+++ b/libavformat/oggparsetheora.c
@@ -0,0 +1,112 @@
+/**
+      Copyright (C) 2005  Matthieu CASTET
+
+      Permission is hereby granted, free of charge, to any person
+      obtaining a copy of this software and associated documentation
+      files (the "Software"), to deal in the Software without
+      restriction, including without limitation the rights to use, copy,
+      modify, merge, publish, distribute, sublicense, and/or sell copies
+      of the Software, and to permit persons to whom the Software is
+      furnished to do so, subject to the following conditions:
+
+      The above copyright notice and this permission notice shall be
+      included in all copies or substantial portions of the Software.
+
+      THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+      EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+      MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+      NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+      HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+      WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+      OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+      DEALINGS IN THE SOFTWARE.
+**/
+
+#include <stdlib.h>
+#include "avformat.h"
+#include "bitstream.h"
+#include "bswap.h"
+#include "ogg2.h"
+
+typedef struct theora_params {
+    int gpshift;
+    int gpmask;
+} theora_params_t;
+
+static int
+theora_header (AVFormatContext * s, int idx)
+{
+    ogg_t *ogg = s->priv_data;
+    ogg_stream_t *os = ogg->streams + idx;
+    AVStream *st = s->streams[idx];
+    theora_params_t *thp = os->private;
+    int cds = st->codec.extradata_size + os->psize + 2;
+    uint8_t *cdp;
+
+    if (os->seq > 2)
+        return 0;
+
+    if(!thp){
+	thp = av_mallocz(sizeof(*thp));
+	os->private = thp;
+    }
+
+    if (os->buf[os->pstart] == 0x80) {
+        GetBitContext gb;
+        init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
+
+        skip_bits(&gb, 7*8); /* 0x80"theora" */
+        skip_bits(&gb, 3*8);
+        
+        st->codec.width = get_bits(&gb, 16) << 4;
+        st->codec.height = get_bits(&gb, 16) << 4;
+
+        skip_bits(&gb, 64);
+        st->codec.time_base.den = get_bits(&gb, 32);
+        st->codec.time_base.num = get_bits(&gb, 32);
+        
+        st->codec.sample_aspect_ratio.num = get_bits(&gb, 24);
+        st->codec.sample_aspect_ratio.den = get_bits(&gb, 24);
+
+        skip_bits(&gb, 38);
+        thp->gpshift = get_bits(&gb, 5);
+	thp->gpmask = (1 << thp->gpshift) - 1;
+
+        st->codec.codec_type = CODEC_TYPE_VIDEO;
+        st->codec.codec_id = CODEC_ID_THEORA;
+
+    } else if (os->buf[os->pstart] == 0x83) {
+        vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
+    }
+
+    st->codec.extradata = av_realloc (st->codec.extradata, cds);
+    cdp = st->codec.extradata + st->codec.extradata_size;
+    *cdp++ = os->psize >> 8;
+    *cdp++ = os->psize & 0xff;
+    memcpy (cdp, os->buf + os->pstart, os->psize);
+    st->codec.extradata_size = cds;
+
+
+    return os->seq < 3;
+}
+
+static uint64_t
+theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp)
+{
+    AVStream *st = ctx->streams[idx];
+    ogg_t *ogg = ctx->priv_data;
+    ogg_stream_t *os = ogg->streams + idx;
+    theora_params_t *thp = os->private;
+    uint64_t iframe = gp >> thp->gpshift;
+    uint64_t pframe = gp & thp->gpmask;
+
+    return (iframe + pframe) * AV_TIME_BASE * st->codec.time_base.num /
+        st->codec.time_base.den;
+}
+
+ogg_codec_t theora_codec = {
+    .magic = "\200theora",
+    .magicsize = 7,
+    .header = theora_header,
+    .gptopts = theora_gptopts
+};