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.
27 #include "bitstream.h"
28 #include "bytestream.h"
34 vorbis_comment(AVFormatContext * as, uint8_t *buf, int size)
39 if (size < 8) /* must have vendor_length and user_comment_list_length */
72 v = memchr(t, '=', s);
84 for (j = 0; j < tl; j++)
85 tt[j] = toupper(t[j]);
91 // took from Vorbis_I_spec
92 if (!strcmp(tt, "AUTHOR") || !strcmp(tt, "ARTIST"))
93 av_strlcpy(as->author, ct, sizeof(as->author));
94 else if (!strcmp(tt, "TITLE"))
95 av_strlcpy(as->title, ct, sizeof(as->title));
96 else if (!strcmp(tt, "COPYRIGHT"))
97 av_strlcpy(as->copyright, ct, sizeof(as->copyright));
98 else if (!strcmp(tt, "DESCRIPTION"))
99 av_strlcpy(as->comment, ct, sizeof(as->comment));
100 else if (!strcmp(tt, "GENRE"))
101 av_strlcpy(as->genre, ct, sizeof(as->genre));
102 else if (!strcmp(tt, "TRACKNUMBER"))
103 as->track = atoi(ct);
104 else if (!strcmp(tt, "ALBUM"))
105 av_strlcpy(as->album, ct, sizeof(as->album));
110 av_log(as, AV_LOG_INFO, "%i bytes of comment header remain\n", size);
112 av_log(as, AV_LOG_INFO,
113 "truncated comment header, %i comments not found\n", n);
119 /** Parse the vorbis header
120 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
121 * [vorbis_version] = read 32 bits as unsigned integer | Not used
122 * [audio_channels] = read 8 bit integer as unsigned | Used
123 * [audio_sample_rate] = read 32 bits as unsigned integer | Used
124 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
125 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
126 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
127 * [blocksize_0] = read 4 bits as unsigned integer | Not Used
128 * [blocksize_1] = read 4 bits as unsigned integer | Not Used
129 * [framing_flag] = read one bit | Not Used
134 unsigned char *packet[3];
135 } oggvorbis_private_t;
139 fixup_vorbis_headers(AVFormatContext * as, oggvorbis_private_t *priv,
145 len = priv->len[0] + priv->len[1] + priv->len[2];
146 ptr = *buf = av_mallocz(len + len/255 + 64);
150 offset += av_xiphlacing(&ptr[offset], priv->len[0]);
151 offset += av_xiphlacing(&ptr[offset], priv->len[1]);
152 for (i = 0; i < 3; i++) {
153 memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
154 offset += priv->len[i];
156 *buf = av_realloc(*buf, offset);
162 vorbis_header (AVFormatContext * s, int idx)
164 ogg_t *ogg = s->priv_data;
165 ogg_stream_t *os = ogg->streams + idx;
166 AVStream *st = s->streams[idx];
167 oggvorbis_private_t *priv;
173 os->private = av_mallocz(sizeof(oggvorbis_private_t));
182 priv->len[os->seq] = os->psize;
183 priv->packet[os->seq] = av_mallocz(os->psize);
184 memcpy(priv->packet[os->seq], os->buf + os->pstart, os->psize);
185 if (os->buf[os->pstart] == 1) {
186 uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
187 unsigned blocksize, bs0, bs1;
192 if (bytestream_get_le32(&p) != 0) /* vorbis_version */
195 st->codec->channels = bytestream_get_byte(&p);
196 st->codec->sample_rate = bytestream_get_le32(&p);
197 p += 4; // skip maximum bitrate
198 st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
199 p += 4; // skip minimum bitrate
201 blocksize = bytestream_get_byte(&p);
202 bs0 = blocksize & 15;
203 bs1 = blocksize >> 4;
207 if (bs0 < 6 || bs1 > 13)
210 if (bytestream_get_byte(&p) != 1) /* framing_flag */
213 st->codec->codec_type = CODEC_TYPE_AUDIO;
214 st->codec->codec_id = CODEC_ID_VORBIS;
216 st->time_base.num = 1;
217 st->time_base.den = st->codec->sample_rate;
218 } else if (os->buf[os->pstart] == 3) {
220 vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
222 st->codec->extradata_size =
223 fixup_vorbis_headers(s, priv, &st->codec->extradata);
229 ogg_codec_t vorbis_codec = {
230 .magic = "\001vorbis",
232 .header = vorbis_header