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 "libavutil/avstring.h"
28 #include "libavutil/base64.h"
29 #include "libavutil/bswap.h"
30 #include "libavutil/dict.h"
31 #include "libavcodec/bytestream.h"
32 #include "libavcodec/get_bits.h"
33 #include "libavcodec/vorbis_parser.h"
38 #include "vorbiscomment.h"
40 static int ogm_chapter(AVFormatContext *as, uint8_t *key, uint8_t *val)
42 int i, cnum, h, m, s, ms, keylen = strlen(key);
43 AVChapter *chapter = NULL;
45 if (keylen < 9 || sscanf(key, "CHAPTER%03d", &cnum) != 1)
49 if (sscanf(val, "%02d:%02d:%02d.%03d", &h, &m, &s, &ms) < 4)
52 avpriv_new_chapter(as, cnum, (AVRational) { 1, 1000 },
53 ms + 1000 * (s + 60 * (m + 60 * h)),
54 AV_NOPTS_VALUE, NULL);
56 } else if (!strcmp(key + (keylen - 4), "NAME")) {
57 for (i = 0; i < as->nb_chapters; i++)
58 if (as->chapters[i]->id == cnum) {
59 chapter = as->chapters[i];
65 av_dict_set(&chapter->metadata, "title", val, AV_DICT_DONT_STRDUP_VAL);
73 int ff_vorbis_comment(AVFormatContext *as, AVDictionary **m,
74 const uint8_t *buf, int size)
76 const uint8_t *p = buf;
77 const uint8_t *end = buf + size;
81 /* must have vendor_length and user_comment_list_length */
85 s = bytestream_get_le32(&p);
87 if (end - p - 4 < s || s < 0)
92 n = bytestream_get_le32(&p);
94 while (end - p >= 4 && n > 0) {
98 s = bytestream_get_le32(&p);
100 if (end - p < s || s < 0)
107 v = memchr(t, '=', s);
118 tt = av_malloc(tl + 1);
119 ct = av_malloc(vl + 1);
123 av_log(as, AV_LOG_WARNING,
124 "out-of-memory error. skipping VorbisComment tag.\n");
128 for (j = 0; j < tl; j++)
129 tt[j] = av_toupper(t[j]);
135 if (!strcmp(tt, "METADATA_BLOCK_PICTURE")) {
137 char *pict = av_malloc(vl);
140 av_log(as, AV_LOG_WARNING, "out-of-memory error. Skipping cover art block.\n");
145 if ((ret = av_base64_decode(pict, ct, vl)) > 0)
146 ret = ff_flac_parse_picture(as, pict, ret);
151 av_log(as, AV_LOG_WARNING, "Failed to parse cover art block.\n");
154 } else if (!ogm_chapter(as, tt, ct))
155 av_dict_set(m, tt, ct,
156 AV_DICT_DONT_STRDUP_KEY |
157 AV_DICT_DONT_STRDUP_VAL);
162 av_log(as, AV_LOG_INFO,
163 "%ti bytes of comment header remain\n", end - p);
165 av_log(as, AV_LOG_INFO,
166 "truncated comment header, %i comments not found\n", n);
168 ff_metadata_conv(m, NULL, ff_vorbiscomment_metadata_conv);
174 * Parse the vorbis header
176 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
177 * [vorbis_version] = read 32 bits as unsigned integer | Not used
178 * [audio_channels] = read 8 bit integer as unsigned | Used
179 * [audio_sample_rate] = read 32 bits as unsigned integer | Used
180 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
181 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
182 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
183 * [blocksize_0] = read 4 bits as unsigned integer | Not Used
184 * [blocksize_1] = read 4 bits as unsigned integer | Not Used
185 * [framing_flag] = read one bit | Not Used
188 struct oggvorbis_private {
190 unsigned char *packet[3];
191 VorbisParseContext vp;
196 static unsigned int fixup_vorbis_headers(AVFormatContext *as,
197 struct oggvorbis_private *priv,
200 int i, offset, len, err;
204 len = priv->len[0] + priv->len[1] + priv->len[2];
205 buf_len = len + len / 255 + 64;
206 ptr = *buf = av_realloc(NULL, buf_len);
209 memset(*buf, '\0', buf_len);
213 offset += av_xiphlacing(&ptr[offset], priv->len[0]);
214 offset += av_xiphlacing(&ptr[offset], priv->len[1]);
215 for (i = 0; i < 3; i++) {
216 memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
217 offset += priv->len[i];
218 av_freep(&priv->packet[i]);
220 if ((err = av_reallocp(buf, offset + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
225 static void vorbis_cleanup(AVFormatContext *s, int idx)
227 struct ogg *ogg = s->priv_data;
228 struct ogg_stream *os = ogg->streams + idx;
229 struct oggvorbis_private *priv = os->private;
232 for (i = 0; i < 3; i++)
233 av_freep(&priv->packet[i]);
236 static int vorbis_header(AVFormatContext *s, int idx)
238 struct ogg *ogg = s->priv_data;
239 AVStream *st = s->streams[idx];
240 struct ogg_stream *os = ogg->streams + idx;
241 struct oggvorbis_private *priv;
242 int pkt_type = os->buf[os->pstart];
245 os->private = av_mallocz(sizeof(struct oggvorbis_private));
253 if (os->psize < 1 || pkt_type > 5)
258 if (priv->packet[pkt_type >> 1])
260 if (pkt_type > 1 && !priv->packet[0] || pkt_type > 3 && !priv->packet[1])
263 priv->len[pkt_type >> 1] = os->psize;
264 priv->packet[pkt_type >> 1] = av_mallocz(os->psize);
265 if (!priv->packet[pkt_type >> 1])
266 return AVERROR(ENOMEM);
267 memcpy(priv->packet[pkt_type >> 1], os->buf + os->pstart, os->psize);
268 if (os->buf[os->pstart] == 1) {
269 const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
270 unsigned blocksize, bs0, bs1;
277 if (bytestream_get_le32(&p) != 0) /* vorbis_version */
280 channels = bytestream_get_byte(&p);
281 if (st->codec->channels && channels != st->codec->channels) {
282 av_log(s, AV_LOG_ERROR, "Channel change is not supported\n");
283 return AVERROR_PATCHWELCOME;
285 st->codec->channels = channels;
286 srate = bytestream_get_le32(&p);
287 p += 4; // skip maximum bitrate
288 st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
289 p += 4; // skip minimum bitrate
291 blocksize = bytestream_get_byte(&p);
292 bs0 = blocksize & 15;
293 bs1 = blocksize >> 4;
297 if (bs0 < 6 || bs1 > 13)
300 if (bytestream_get_byte(&p) != 1) /* framing_flag */
303 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
304 st->codec->codec_id = AV_CODEC_ID_VORBIS;
307 st->codec->sample_rate = srate;
308 avpriv_set_pts_info(st, 64, 1, srate);
310 } else if (os->buf[os->pstart] == 3) {
312 ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7,
313 os->psize - 8) >= 0) {
314 // drop all metadata we parsed and which is not required by libvorbis
315 unsigned new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1;
316 if (new_len >= 16 && new_len < os->psize) {
317 AV_WL32(priv->packet[1] + new_len - 5, 0);
318 priv->packet[1][new_len - 1] = 1;
319 priv->len[1] = new_len;
323 int ret = fixup_vorbis_headers(s, priv, &st->codec->extradata);
325 st->codec->extradata_size = 0;
328 st->codec->extradata_size = ret;
329 if ((ret = avpriv_vorbis_parse_extradata(st->codec, &priv->vp))) {
330 av_freep(&st->codec->extradata);
331 st->codec->extradata_size = 0;
339 static int vorbis_packet(AVFormatContext *s, int idx)
341 struct ogg *ogg = s->priv_data;
342 struct ogg_stream *os = ogg->streams + idx;
343 struct oggvorbis_private *priv = os->private;
346 /* first packet handling
347 * here we parse the duration of each packet in the first page and compare
348 * the total duration to the page granule to find the encoder delay and
349 * set the first timestamp */
350 if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) {
352 uint8_t *last_pkt = os->buf + os->pstart;
353 uint8_t *next_pkt = last_pkt;
355 avpriv_vorbis_parse_reset(&priv->vp);
358 d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1);
360 os->pflags |= AV_PKT_FLAG_CORRUPT;
364 last_pkt = next_pkt = next_pkt + os->psize;
365 for (; seg < os->nsegs; seg++) {
366 if (os->segments[seg] < 255) {
367 int d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1);
369 duration = os->granule;
373 last_pkt = next_pkt + os->segments[seg];
375 next_pkt += os->segments[seg];
378 os->lastdts = os->granule - duration;
379 if (s->streams[idx]->start_time == AV_NOPTS_VALUE) {
380 s->streams[idx]->start_time = FFMAX(os->lastpts, 0);
381 if (s->streams[idx]->duration)
382 s->streams[idx]->duration -= s->streams[idx]->start_time;
384 priv->final_pts = AV_NOPTS_VALUE;
385 avpriv_vorbis_parse_reset(&priv->vp);
388 /* parse packet duration */
390 duration = avpriv_vorbis_parse_frame(&priv->vp, os->buf + os->pstart, 1);
392 os->pflags |= AV_PKT_FLAG_CORRUPT;
395 os->pduration = duration;
398 /* final packet handling
399 * here we save the pts of the first packet in the final page, sum up all
400 * packet durations in the final page except for the last one, and compare
401 * to the page granule to find the duration of the final packet */
402 if (os->flags & OGG_FLAG_EOS) {
403 if (os->lastpts != AV_NOPTS_VALUE) {
404 priv->final_pts = os->lastpts;
405 priv->final_duration = 0;
407 if (os->segp == os->nsegs)
408 os->pduration = os->granule - priv->final_pts - priv->final_duration;
409 priv->final_duration += os->pduration;
415 const struct ogg_codec ff_vorbis_codec = {
416 .magic = "\001vorbis",
418 .header = vorbis_header,
419 .packet = vorbis_packet,
420 .cleanup = vorbis_cleanup,