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];
206 return os->private ? 0 : -1;
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 if (!priv->packet[pkt_type >> 1])
227 return AVERROR(ENOMEM);
228 memcpy(priv->packet[pkt_type >> 1], os->buf + os->pstart, os->psize);
229 if (os->buf[os->pstart] == 1) {
230 const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
231 unsigned blocksize, bs0, bs1;
238 if (bytestream_get_le32(&p) != 0) /* vorbis_version */
241 channels= bytestream_get_byte(&p);
242 if (st->codec->channels && channels != st->codec->channels) {
243 av_log(s, AV_LOG_ERROR, "Channel change is not supported\n");
244 return AVERROR_PATCHWELCOME;
246 st->codec->channels = channels;
247 srate = bytestream_get_le32(&p);
248 p += 4; // skip maximum bitrate
249 st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
250 p += 4; // skip minimum bitrate
252 blocksize = bytestream_get_byte(&p);
253 bs0 = blocksize & 15;
254 bs1 = blocksize >> 4;
258 if (bs0 < 6 || bs1 > 13)
261 if (bytestream_get_byte(&p) != 1) /* framing_flag */
264 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
265 st->codec->codec_id = AV_CODEC_ID_VORBIS;
268 st->codec->sample_rate = srate;
269 avpriv_set_pts_info(st, 64, 1, srate);
271 } else if (os->buf[os->pstart] == 3) {
273 ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8) >= 0) {
274 // drop all metadata we parsed and which is not required by libvorbis
275 unsigned new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1;
276 if (new_len >= 16 && new_len < os->psize) {
277 AV_WL32(priv->packet[1] + new_len - 5, 0);
278 priv->packet[1][new_len - 1] = 1;
279 priv->len[1] = new_len;
284 st->codec->extradata_size =
285 fixup_vorbis_headers(s, priv, &st->codec->extradata);
286 if ((ret = avpriv_vorbis_parse_extradata(st->codec, &priv->vp))) {
287 av_freep(&st->codec->extradata);
288 st->codec->extradata_size = 0;
296 static int vorbis_packet(AVFormatContext *s, int idx)
298 struct ogg *ogg = s->priv_data;
299 struct ogg_stream *os = ogg->streams + idx;
300 struct oggvorbis_private *priv = os->private;
303 /* first packet handling
304 here we parse the duration of each packet in the first page and compare
305 the total duration to the page granule to find the encoder delay and
306 set the first timestamp */
307 if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) {
309 uint8_t *last_pkt = os->buf + os->pstart;
310 uint8_t *next_pkt = last_pkt;
312 avpriv_vorbis_parse_reset(&priv->vp);
315 d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1);
317 os->pflags |= AV_PKT_FLAG_CORRUPT;
321 last_pkt = next_pkt = next_pkt + os->psize;
322 for (; seg < os->nsegs; seg++) {
323 if (os->segments[seg] < 255) {
324 int d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1);
326 duration = os->granule;
330 last_pkt = next_pkt + os->segments[seg];
332 next_pkt += os->segments[seg];
334 os->lastpts = os->lastdts = os->granule - duration;
335 if(s->streams[idx]->start_time == AV_NOPTS_VALUE) {
336 s->streams[idx]->start_time = FFMAX(os->lastpts, 0);
337 if (s->streams[idx]->duration)
338 s->streams[idx]->duration -= s->streams[idx]->start_time;
340 priv->final_pts = AV_NOPTS_VALUE;
341 avpriv_vorbis_parse_reset(&priv->vp);
344 /* parse packet duration */
346 duration = avpriv_vorbis_parse_frame(&priv->vp, os->buf + os->pstart, 1);
348 os->pflags |= AV_PKT_FLAG_CORRUPT;
351 os->pduration = duration;
354 /* final packet handling
355 here we save the pts of the first packet in the final page, sum up all
356 packet durations in the final page except for the last one, and compare
357 to the page granule to find the duration of the final packet */
358 if (os->flags & OGG_FLAG_EOS) {
359 if (os->lastpts != AV_NOPTS_VALUE) {
360 priv->final_pts = os->lastpts;
361 priv->final_duration = 0;
363 if (os->segp == os->nsegs)
364 os->pduration = os->granule - priv->final_pts - priv->final_duration;
365 priv->final_duration += os->pduration;
371 const struct ogg_codec ff_vorbis_codec = {
372 .magic = "\001vorbis",
374 .header = vorbis_header,
375 .packet = vorbis_packet,