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 "libavutil/dict.h"
29 #include "libavcodec/get_bits.h"
30 #include "libavcodec/bytestream.h"
31 #include "libavcodec/vorbis_parser.h"
35 #include "vorbiscomment.h"
37 static int ogm_chapter(AVFormatContext *as, uint8_t *key, uint8_t *val)
39 int i, cnum, h, m, s, ms, keylen = strlen(key);
40 AVChapter *chapter = NULL;
42 if (keylen < 9 || sscanf(key, "CHAPTER%02d", &cnum) != 1)
46 if (sscanf(val, "%02d:%02d:%02d.%03d", &h, &m, &s, &ms) < 4)
49 avpriv_new_chapter(as, cnum, (AVRational){1,1000},
50 ms + 1000*(s + 60*(m + 60*h)),
51 AV_NOPTS_VALUE, NULL);
53 } else if (!strcmp(key+9, "NAME")) {
54 for(i = 0; i < as->nb_chapters; i++)
55 if (as->chapters[i]->id == cnum) {
56 chapter = as->chapters[i];
62 av_dict_set(&chapter->metadata, "title", val,
63 AV_DICT_DONT_STRDUP_VAL);
72 ff_vorbis_comment(AVFormatContext * as, AVDictionary **m, const uint8_t *buf, int size)
74 const uint8_t *p = buf;
75 const uint8_t *end = buf + size;
79 if (size < 8) /* must have vendor_length and user_comment_list_length */
82 s = bytestream_get_le32(&p);
84 if (end - p - 4 < s || s < 0)
89 n = bytestream_get_le32(&p);
91 while (end - p >= 4 && n > 0) {
95 s = bytestream_get_le32(&p);
97 if (end - p < s || s < 0)
104 v = memchr(t, '=', s);
115 tt = av_malloc(tl + 1);
116 ct = av_malloc(vl + 1);
120 av_log(as, AV_LOG_WARNING, "out-of-memory error. skipping VorbisComment tag.\n");
124 for (j = 0; j < tl; j++)
125 tt[j] = toupper(t[j]);
131 if (!ogm_chapter(as, tt, ct))
132 av_dict_set(m, tt, ct,
133 AV_DICT_DONT_STRDUP_KEY |
134 AV_DICT_DONT_STRDUP_VAL);
139 av_log(as, AV_LOG_INFO, "%ti bytes of comment header remain\n", end-p);
141 av_log(as, AV_LOG_INFO,
142 "truncated comment header, %i comments not found\n", n);
144 ff_metadata_conv(m, NULL, ff_vorbiscomment_metadata_conv);
150 /** Parse the vorbis header
151 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
152 * [vorbis_version] = read 32 bits as unsigned integer | Not used
153 * [audio_channels] = read 8 bit integer as unsigned | Used
154 * [audio_sample_rate] = read 32 bits as unsigned integer | Used
155 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
156 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
157 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
158 * [blocksize_0] = read 4 bits as unsigned integer | Not Used
159 * [blocksize_1] = read 4 bits as unsigned integer | Not Used
160 * [framing_flag] = read one bit | Not Used
163 struct oggvorbis_private {
165 unsigned char *packet[3];
166 VorbisParseContext vp;
173 fixup_vorbis_headers(AVFormatContext * as, struct oggvorbis_private *priv,
179 len = priv->len[0] + priv->len[1] + priv->len[2];
180 ptr = *buf = av_mallocz(len + len/255 + 64);
184 offset += av_xiphlacing(&ptr[offset], priv->len[0]);
185 offset += av_xiphlacing(&ptr[offset], priv->len[1]);
186 for (i = 0; i < 3; i++) {
187 memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
188 offset += priv->len[i];
189 av_freep(&priv->packet[i]);
191 *buf = av_realloc(*buf, offset + FF_INPUT_BUFFER_PADDING_SIZE);
197 vorbis_header (AVFormatContext * s, int idx)
199 struct ogg *ogg = s->priv_data;
200 struct ogg_stream *os = ogg->streams + idx;
201 AVStream *st = s->streams[idx];
202 struct oggvorbis_private *priv;
203 int pkt_type = os->buf[os->pstart];
209 os->private = av_mallocz(sizeof(struct oggvorbis_private));
214 if (os->psize < 1 || pkt_type > 5)
219 if (priv->packet[pkt_type>>1])
221 if (pkt_type > 1 && !priv->packet[0] || pkt_type > 3 && !priv->packet[1])
224 priv->len[pkt_type >> 1] = os->psize;
225 priv->packet[pkt_type >> 1] = av_mallocz(os->psize);
226 memcpy(priv->packet[pkt_type >> 1], os->buf + os->pstart, os->psize);
227 if (os->buf[os->pstart] == 1) {
228 const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
229 unsigned blocksize, bs0, bs1;
235 if (bytestream_get_le32(&p) != 0) /* vorbis_version */
238 st->codec->channels = bytestream_get_byte(&p);
239 srate = bytestream_get_le32(&p);
240 p += 4; // skip maximum bitrate
241 st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
242 p += 4; // skip minimum bitrate
244 blocksize = bytestream_get_byte(&p);
245 bs0 = blocksize & 15;
246 bs1 = blocksize >> 4;
250 if (bs0 < 6 || bs1 > 13)
253 if (bytestream_get_byte(&p) != 1) /* framing_flag */
256 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
257 st->codec->codec_id = CODEC_ID_VORBIS;
260 st->codec->sample_rate = srate;
261 avpriv_set_pts_info(st, 64, 1, srate);
263 } else if (os->buf[os->pstart] == 3) {
265 ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8) >= 0) {
266 // drop all metadata we parsed and which is not required by libvorbis
267 unsigned new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1;
268 if (new_len >= 16 && new_len < os->psize) {
269 AV_WL32(priv->packet[1] + new_len - 5, 0);
270 priv->packet[1][new_len - 1] = 1;
271 priv->len[1] = new_len;
276 st->codec->extradata_size =
277 fixup_vorbis_headers(s, priv, &st->codec->extradata);
278 if ((ret = avpriv_vorbis_parse_extradata(st->codec, &priv->vp))) {
279 av_freep(&st->codec->extradata);
280 st->codec->extradata_size = 0;
288 static int vorbis_packet(AVFormatContext *s, int idx)
290 struct ogg *ogg = s->priv_data;
291 struct ogg_stream *os = ogg->streams + idx;
292 struct oggvorbis_private *priv = os->private;
295 /* first packet handling
296 here we parse the duration of each packet in the first page and compare
297 the total duration to the page granule to find the encoder delay and
298 set the first timestamp */
301 uint8_t *last_pkt = os->buf + os->pstart;
302 uint8_t *next_pkt = last_pkt;
303 int first_duration = 0;
305 avpriv_vorbis_parse_reset(&priv->vp);
307 for (seg = 0; seg < os->nsegs; seg++) {
308 if (os->segments[seg] < 255) {
309 int d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1);
311 duration = os->granule;
317 last_pkt = next_pkt + os->segments[seg];
319 next_pkt += os->segments[seg];
321 os->lastpts = os->lastdts = os->granule - duration;
322 s->streams[idx]->start_time = os->lastpts + first_duration;
323 if (s->streams[idx]->duration)
324 s->streams[idx]->duration -= s->streams[idx]->start_time;
325 s->streams[idx]->cur_dts = AV_NOPTS_VALUE;
326 priv->final_pts = AV_NOPTS_VALUE;
327 avpriv_vorbis_parse_reset(&priv->vp);
330 /* parse packet duration */
332 duration = avpriv_vorbis_parse_frame(&priv->vp, os->buf + os->pstart, 1);
334 os->pflags |= AV_PKT_FLAG_CORRUPT;
337 os->pduration = duration;
340 /* final packet handling
341 here we save the pts of the first packet in the final page, sum up all
342 packet durations in the final page except for the last one, and compare
343 to the page granule to find the duration of the final packet */
344 if (os->flags & OGG_FLAG_EOS) {
345 if (os->lastpts != AV_NOPTS_VALUE) {
346 priv->final_pts = os->lastpts;
347 priv->final_duration = 0;
349 if (os->segp == os->nsegs)
350 os->pduration = os->granule - priv->final_pts - priv->final_duration;
351 priv->final_duration += os->pduration;
357 const struct ogg_codec ff_vorbis_codec = {
358 .magic = "\001vorbis",
360 .header = vorbis_header,
361 .packet = vorbis_packet,