2 Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
4 Permission is hereby granted, free of charge, to any person
5 obtaining a copy of this software and associated documentation
6 files (the "Software"), to deal in the Software without
7 restriction, including without limitation the rights to use, copy,
8 modify, merge, publish, distribute, sublicense, and/or sell copies
9 of the Software, and to permit persons to whom the Software is
10 furnished to do so, subject to the following conditions:
12 The above copyright notice and this permission notice shall be
13 included in all copies or substantial portions of the Software.
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 DEALINGS IN THE SOFTWARE.
26 #include "libavutil/avstring.h"
27 #include "libavutil/bswap.h"
28 #include "libavcodec/get_bits.h"
29 #include "libavcodec/bytestream.h"
34 * VorbisComment metadata conversion mapping.
35 * from Ogg Vorbis I format specification: comment field and header specification
36 * http://xiph.org/vorbis/doc/v-comment.html
38 const AVMetadataConv ff_vorbiscomment_metadata_conv
[] = {
39 { "ARTIST" , "author" },
41 { "TRACKNUMBER", "track" },
46 vorbis_comment(AVFormatContext
* as
, uint8_t *buf
, int size
)
48 const uint8_t *p
= buf
;
49 const uint8_t *end
= buf
+ size
;
53 if (size
< 8) /* must have vendor_length and user_comment_list_length */
56 s
= bytestream_get_le32(&p
);
58 if (end
- p
- 4 < s
|| s
< 0)
63 n
= bytestream_get_le32(&p
);
65 while (end
- p
>= 4 && n
> 0) {
69 s
= bytestream_get_le32(&p
);
71 if (end
- p
< s
|| s
< 0)
78 v
= memchr(t
, '=', s
);
89 tt
= av_malloc(tl
+ 1);
90 ct
= av_malloc(vl
+ 1);
94 av_log(as
, AV_LOG_WARNING
, "out-of-memory error. skipping VorbisComment tag.\n");
98 for (j
= 0; j
< tl
; j
++)
99 tt
[j
] = toupper(t
[j
]);
105 av_metadata_set(&as
->metadata
, tt
, ct
);
113 av_log(as
, AV_LOG_INFO
, "%ti bytes of comment header remain\n", end
-p
);
115 av_log(as
, AV_LOG_INFO
,
116 "truncated comment header, %i comments not found\n", n
);
122 /** Parse the vorbis header
123 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
124 * [vorbis_version] = read 32 bits as unsigned integer | Not used
125 * [audio_channels] = read 8 bit integer as unsigned | Used
126 * [audio_sample_rate] = read 32 bits as unsigned integer | Used
127 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
128 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
129 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
130 * [blocksize_0] = read 4 bits as unsigned integer | Not Used
131 * [blocksize_1] = read 4 bits as unsigned integer | Not Used
132 * [framing_flag] = read one bit | Not Used
135 struct oggvorbis_private
{
137 unsigned char *packet
[3];
142 fixup_vorbis_headers(AVFormatContext
* as
, struct oggvorbis_private
*priv
,
148 len
= priv
->len
[0] + priv
->len
[1] + priv
->len
[2];
149 ptr
= *buf
= av_mallocz(len
+ len
/255 + 64);
153 offset
+= av_xiphlacing(&ptr
[offset
], priv
->len
[0]);
154 offset
+= av_xiphlacing(&ptr
[offset
], priv
->len
[1]);
155 for (i
= 0; i
< 3; i
++) {
156 memcpy(&ptr
[offset
], priv
->packet
[i
], priv
->len
[i
]);
157 offset
+= priv
->len
[i
];
159 *buf
= av_realloc(*buf
, offset
+ FF_INPUT_BUFFER_PADDING_SIZE
);
165 vorbis_header (AVFormatContext
* s
, int idx
)
167 struct ogg
*ogg
= s
->priv_data
;
168 struct ogg_stream
*os
= ogg
->streams
+ idx
;
169 AVStream
*st
= s
->streams
[idx
];
170 struct oggvorbis_private
*priv
;
176 os
->private = av_mallocz(sizeof(struct oggvorbis_private
));
185 priv
->len
[os
->seq
] = os
->psize
;
186 priv
->packet
[os
->seq
] = av_mallocz(os
->psize
);
187 memcpy(priv
->packet
[os
->seq
], os
->buf
+ os
->pstart
, os
->psize
);
188 if (os
->buf
[os
->pstart
] == 1) {
189 const uint8_t *p
= os
->buf
+ os
->pstart
+ 7; /* skip "\001vorbis" tag */
190 unsigned blocksize
, bs0
, bs1
;
195 if (bytestream_get_le32(&p
) != 0) /* vorbis_version */
198 st
->codec
->channels
= bytestream_get_byte(&p
);
199 st
->codec
->sample_rate
= bytestream_get_le32(&p
);
200 p
+= 4; // skip maximum bitrate
201 st
->codec
->bit_rate
= bytestream_get_le32(&p
); // nominal bitrate
202 p
+= 4; // skip minimum bitrate
204 blocksize
= bytestream_get_byte(&p
);
205 bs0
= blocksize
& 15;
206 bs1
= blocksize
>> 4;
210 if (bs0
< 6 || bs1
> 13)
213 if (bytestream_get_byte(&p
) != 1) /* framing_flag */
216 st
->codec
->codec_type
= CODEC_TYPE_AUDIO
;
217 st
->codec
->codec_id
= CODEC_ID_VORBIS
;
219 st
->time_base
.num
= 1;
220 st
->time_base
.den
= st
->codec
->sample_rate
;
221 } else if (os
->buf
[os
->pstart
] == 3) {
223 vorbis_comment (s
, os
->buf
+ os
->pstart
+ 7, os
->psize
- 8);
225 st
->codec
->extradata_size
=
226 fixup_vorbis_headers(s
, priv
, &st
->codec
->extradata
);
232 const struct ogg_codec ff_vorbis_codec
= {
233 .magic
= "\001vorbis",
235 .header
= vorbis_header