ogm demuxing

Originally committed as revision 5365 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 161 insertions, 0 deletions

diff --git a/libavformat/oggparseogm.c b/libavformat/oggparseogm.c
new file mode 100644
index 0000000000..6468bdf260
--- /dev/null
+++ b/libavformat/oggparseogm.c
@@ -0,0 +1,161 @@
+/**
+    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"
+#include "avi.h"
+
+static int
+ogm_header(AVFormatContext *s, int idx)
+{
+    ogg_t *ogg = s->priv_data;
+    ogg_stream_t *os = ogg->streams + idx;
+    AVStream *st = s->streams[idx];
+    uint8_t *p = os->buf + os->pstart;
+    uint64_t time_unit;
+    uint64_t spu;
+    uint32_t default_len;
+
+    if(!(*p & 1))
+        return 0;
+    if(*p != 1)
+        return 1;
+
+    p++;
+
+    if(*p == 'v'){
+        st->codec->codec_type = CODEC_TYPE_VIDEO;
+        p += 8;
+        st->codec->codec_id = codec_get_bmp_id(le2me_32(unaligned32(p)));
+    } else {
+        int cid;
+        st->codec->codec_type = CODEC_TYPE_AUDIO;
+        p += 8;
+        p[4] = 0;
+        cid = strtol(p, NULL, 16);
+        st->codec->codec_id = codec_get_wav_id(cid);
+    }
+
+    p += 4;
+    p += 4;                     /* useless size field */
+
+    time_unit = le2me_64(unaligned64(p));
+    p += 8;
+    spu = le2me_64(unaligned64(p));
+    p += 8;
+    default_len = le2me_32(unaligned32(p));
+    p += 4;
+
+    p += 8;                     /* buffersize + bits_per_sample */
+
+    if(st->codec->codec_type == CODEC_TYPE_VIDEO){
+        st->codec->width = le2me_32(unaligned32(p));
+        p += 4;
+        st->codec->height = le2me_32(unaligned32(p));
+        st->codec->time_base.den = spu * 10000000;
+        st->codec->time_base.num = time_unit;
+        st->time_base = st->codec->time_base;
+    } else {
+        st->codec->channels = le2me_16(unaligned16(p));
+        p += 2;
+        p += 2;                 /* block_align */
+        st->codec->bit_rate = le2me_32(unaligned32(p)) * 8;
+        st->codec->sample_rate = spu * 10000000 / time_unit;
+    }
+
+    return 1;
+}
+
+static int
+ogm_dshow_header(AVFormatContext *s, int idx)
+{
+    ogg_t *ogg = s->priv_data;
+    ogg_stream_t *os = ogg->streams + idx;
+    AVStream *st = s->streams[idx];
+    uint8_t *p = os->buf + os->pstart;
+    uint32_t t;
+
+    if(!(*p & 1))
+        return 0;
+    if(*p != 1)
+        return 1;
+
+    t = le2me_32(unaligned32(p + 96));
+
+    if(t == 0x05589f80){
+        st->codec->codec_type = CODEC_TYPE_VIDEO;
+        st->codec->codec_id = codec_get_bmp_id(le2me_32(unaligned32(p + 68)));
+        st->codec->time_base.den = 10000000;
+        st->codec->time_base.num = le2me_64(unaligned64(p + 164));
+        st->codec->width = le2me_32(unaligned32(p + 176));
+        st->codec->height = le2me_32(unaligned32(p + 180));
+    } else if(t == 0x05589f81){
+        st->codec->codec_type = CODEC_TYPE_AUDIO;
+        st->codec->codec_id = codec_get_wav_id(le2me_16(unaligned16(p+124)));
+        st->codec->channels = le2me_16(unaligned16(p + 126));
+        st->codec->sample_rate = le2me_32(unaligned32(p + 128));
+        st->codec->bit_rate = le2me_32(unaligned32(p + 132)) * 8;
+    }
+
+    return 1;
+}
+
+static int
+ogm_packet(AVFormatContext *s, int idx)
+{
+    ogg_t *ogg = s->priv_data;
+    ogg_stream_t *os = ogg->streams + idx;
+    uint8_t *p = os->buf + os->pstart;
+    int lb;
+
+    lb = ((*p & 2) << 1) | ((*p >> 6) & 3);
+    os->pstart += lb + 1;
+    os->psize -= lb + 1;
+
+    return 0;
+}
+
+ogg_codec_t ogm_video_codec = {
+    .magic = "\001video",
+    .magicsize = 6,
+    .header = ogm_header,
+    .packet = ogm_packet
+};
+
+ogg_codec_t ogm_audio_codec = {
+    .magic = "\001audio",
+    .magicsize = 6,
+    .header = ogm_header,
+    .packet = ogm_packet
+};
+
+ogg_codec_t ogm_old_codec = {
+    .magic = "\001Direct Show Samples embedded in Ogg",
+    .magicsize = 35,
+    .header = ogm_dshow_header,
+    .packet = ogm_packet
+};