Ogg demuxer ported from tcvp by Luca Barbato <lu_zero at gentoo dot org>,

fixups by me.

Originally committed as revision 4113 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 169 insertions, 0 deletions

diff --git a/libavformat/oggparsevorbis.c b/libavformat/oggparsevorbis.c
new file mode 100644
index 0000000000..0c765e2b83
--- /dev/null
+++ b/libavformat/oggparsevorbis.c
@@ -0,0 +1,169 @@
+/**
+      Copyright (C) 2005  Michael Ahlberg, Måns Rullgård
+
+      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"
+
+extern int
+vorbis_comment (AVFormatContext * as, char *buf, int size)
+{
+    char *p = buf;
+    int s, n, j;
+
+    if (size < 4)
+        return -1;
+
+    s = le2me_32 (unaligned32 (p));
+    p += 4;
+    size -= 4;
+
+    if (size < s + 4)
+        return -1;
+
+    p += s;
+    size -= s;
+
+    n = le2me_32 (unaligned32 (p));
+    p += 4;
+    size -= 4;
+
+    while (size >= 4){
+        char *t, *v;
+        int tl, vl;
+
+        s = le2me_32 (unaligned32 (p));
+        p += 4;
+        size -= 4;
+
+        if (size < s)
+            break;
+
+        t = p;
+        p += s;
+        size -= s;
+        n--;
+
+        v = memchr (t, '=', s);
+        if (!v)
+            continue;
+
+        tl = v - t;
+        vl = s - tl - 1;
+        v++;
+
+        if (tl && vl){
+            char tt[tl + 1];
+            char ct[vl + 1];
+
+            for (j = 0; j < tl; j++)
+                tt[j] = toupper (t[j]);
+            tt[tl] = 0;
+
+            memcpy (ct, v, vl);
+            ct[vl] = 0;
+
+            // took from Vorbis_I_spec 
+            if (!strcmp (tt, "AUTHOR"))
+                strncpy (as->author, ct, FFMIN(sizeof (as->author), vl));
+            else if (!strcmp (tt, "TITLE"))
+                strncpy (as->title, ct, FFMIN(sizeof (as->title), vl));
+            else if (!strcmp (tt, "COPYRIGHT"))
+                strncpy (as->copyright, ct, FFMIN(sizeof (as->copyright), vl));
+            else if (!strcmp (tt, "DESCRIPTION"))
+                strncpy (as->comment, ct, FFMIN(sizeof (as->comment), vl));
+            else if (!strcmp (tt, "GENRE"))
+                strncpy (as->genre, ct, FFMIN(sizeof (as->genre), vl));
+            else if (!strcmp (tt, "TRACKNUMBER"))
+                as->track = atoi (ct);
+            //Too bored to add others for today
+        }
+    }
+
+    if (size > 0)
+        av_log (as, AV_LOG_INFO, "%i bytes of comment header remain\n", size);
+    if (n > 0)
+        av_log (as, AV_LOG_INFO,
+                "truncated comment header, %i comments not found\n", n);
+
+    return 0;
+}
+
+
+/** Parse the vorbis header
+ * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
+ * [vorbis_version] = read 32 bits as unsigned integer | Not used
+ * [audio_channels] = read 8 bit integer as unsigned | Used
+ * [audio_sample_rate] = read 32 bits as unsigned integer | Used 
+ * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
+ * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
+ * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
+ * [blocksize_0] = read 4 bits as unsigned integer | Not Used
+ * [blocksize_1] = read 4 bits as unsigned integer | Not Used
+ * [framing_flag] = read one bit | Not Used
+ *    */
+
+static int
+vorbis_header (AVFormatContext * s, int idx)
+{
+    ogg_t *ogg = s->priv_data;
+    ogg_stream_t *os = ogg->streams + idx;
+    AVStream *st = s->streams[idx];
+    int cds = st->codec.extradata_size + os->psize + 2;
+    u_char *cdp;
+
+    if (os->seq > 2)
+        return 0;
+
+    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;
+
+    if (os->buf[os->pstart] == 1) {
+        u_char *p = os->buf + os->pstart + 11; //skip up to the audio channels
+        st->codec.channels = *p++;
+        st->codec.sample_rate = le2me_32 (unaligned32 (p));
+        p += 8; //skip maximum and and nominal bitrate
+        st->codec.bit_rate = le2me_32 (unaligned32 (p)); //Minimum bitrate
+
+        st->codec.codec_type = CODEC_TYPE_AUDIO;
+        st->codec.codec_id = CODEC_ID_VORBIS;
+
+    } else if (os->buf[os->pstart] == 3) {
+        vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
+    }
+
+    return os->seq < 3;
+}
+
+ogg_codec_t vorbis_codec = {
+    .magic = "\001vorbis",
+    .magicsize = 7,
+    .header = vorbis_header
+};