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 { "ALBUMARTIST", "album_artist"},
40 { "TRACKNUMBER", "track" },
45 vorbis_comment(AVFormatContext * as, uint8_t *buf, int size)
47 const uint8_t *p = buf;
48 const uint8_t *end = buf + size;
52 if (size < 8) /* must have vendor_length and user_comment_list_length */
55 s = bytestream_get_le32(&p);
57 if (end - p - 4 < s || s < 0)
62 n = bytestream_get_le32(&p);
64 while (end - p >= 4 && n > 0) {
68 s = bytestream_get_le32(&p);
70 if (end - p < s || s < 0)
77 v = memchr(t, '=', s);
88 tt = av_malloc(tl + 1);
89 ct = av_malloc(vl + 1);
93 av_log(as, AV_LOG_WARNING, "out-of-memory error. skipping VorbisComment tag.\n");
97 for (j = 0; j < tl; j++)
98 tt[j] = toupper(t[j]);
104 av_metadata_set2(&as->metadata, tt, ct,
105 AV_METADATA_DONT_STRDUP_KEY |
106 AV_METADATA_DONT_STRDUP_VAL);
111 av_log(as, AV_LOG_INFO, "%ti bytes of comment header remain\n", end-p);
113 av_log(as, AV_LOG_INFO,
114 "truncated comment header, %i comments not found\n", n);
120 /** Parse the vorbis header
121 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
122 * [vorbis_version] = read 32 bits as unsigned integer | Not used
123 * [audio_channels] = read 8 bit integer as unsigned | Used
124 * [audio_sample_rate] = read 32 bits as unsigned integer | Used
125 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
126 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
127 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
128 * [blocksize_0] = read 4 bits as unsigned integer | Not Used
129 * [blocksize_1] = read 4 bits as unsigned integer | Not Used
130 * [framing_flag] = read one bit | Not Used
133 struct oggvorbis_private {
135 unsigned char *packet[3];
140 fixup_vorbis_headers(AVFormatContext * as, struct oggvorbis_private *priv,
146 len = priv->len[0] + priv->len[1] + priv->len[2];
147 ptr = *buf = av_mallocz(len + len/255 + 64);
151 offset += av_xiphlacing(&ptr[offset], priv->len[0]);
152 offset += av_xiphlacing(&ptr[offset], priv->len[1]);
153 for (i = 0; i < 3; i++) {
154 memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
155 offset += priv->len[i];
157 *buf = av_realloc(*buf, offset + FF_INPUT_BUFFER_PADDING_SIZE);
163 vorbis_header (AVFormatContext * s, int idx)
165 struct ogg *ogg = s->priv_data;
166 struct ogg_stream *os = ogg->streams + idx;
167 AVStream *st = s->streams[idx];
168 struct oggvorbis_private *priv;
174 os->private = av_mallocz(sizeof(struct oggvorbis_private));
183 priv->len[os->seq] = os->psize;
184 priv->packet[os->seq] = av_mallocz(os->psize);
185 memcpy(priv->packet[os->seq], os->buf + os->pstart, os->psize);
186 if (os->buf[os->pstart] == 1) {
187 const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
188 unsigned blocksize, bs0, bs1;
193 if (bytestream_get_le32(&p) != 0) /* vorbis_version */
196 st->codec->channels = bytestream_get_byte(&p);
197 st->codec->sample_rate = bytestream_get_le32(&p);
198 p += 4; // skip maximum bitrate
199 st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
200 p += 4; // skip minimum bitrate
202 blocksize = bytestream_get_byte(&p);
203 bs0 = blocksize & 15;
204 bs1 = blocksize >> 4;
208 if (bs0 < 6 || bs1 > 13)
211 if (bytestream_get_byte(&p) != 1) /* framing_flag */
214 st->codec->codec_type = CODEC_TYPE_AUDIO;
215 st->codec->codec_id = CODEC_ID_VORBIS;
217 st->time_base.num = 1;
218 st->time_base.den = st->codec->sample_rate;
219 } else if (os->buf[os->pstart] == 3) {
221 vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
223 st->codec->extradata_size =
224 fixup_vorbis_headers(s, priv, &st->codec->extradata);
230 const struct ogg_codec ff_vorbis_codec = {
231 .magic = "\001vorbis",
233 .header = vorbis_header