summaryrefslogtreecommitdiff
path: root/libavformat/oggparsevorbis.c
blob: 1a9776ef15045214ae95aefad32a742640e237d5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
/**
      Copyright (C) 2005  Michael Ahlberg, Måns Rullgård

      Permission is hereby granted, free of charge, to any person
      obtaining a copy of this software and associated documentation
      files (the "Software"), to deal in the Software without
      restriction, including without limitation the rights to use, copy,
      modify, merge, publish, distribute, sublicense, and/or sell copies
      of the Software, and to permit persons to whom the Software is
      furnished to do so, subject to the following conditions:

      The above copyright notice and this permission notice shall be
      included in all copies or substantial portions of the Software.

      THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
      EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
      MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
      NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
      HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
      WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
      OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      DEALINGS IN THE SOFTWARE.
**/

#include <stdlib.h>
#include "libavutil/avstring.h"
#include "libavutil/bswap.h"
#include "libavutil/dict.h"
#include "libavcodec/get_bits.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/vorbis_parser.h"
#include "avformat.h"
#include "internal.h"
#include "oggdec.h"
#include "vorbiscomment.h"

static int ogm_chapter(AVFormatContext *as, uint8_t *key, uint8_t *val)
{
    int i, cnum, h, m, s, ms, keylen = strlen(key);
    AVChapter *chapter = NULL;

    if (keylen < 9 || sscanf(key, "CHAPTER%02d", &cnum) != 1)
        return 0;

    if (keylen == 9) {
        if (sscanf(val, "%02d:%02d:%02d.%03d", &h, &m, &s, &ms) < 4)
            return 0;

        avpriv_new_chapter(as, cnum, (AVRational){1,1000},
                       ms + 1000*(s + 60*(m + 60*h)),
                       AV_NOPTS_VALUE, NULL);
        av_free(val);
    } else if (!strcmp(key+9, "NAME")) {
        for(i = 0; i < as->nb_chapters; i++)
            if (as->chapters[i]->id == cnum) {
                chapter = as->chapters[i];
                break;
            }
        if (!chapter)
            return 0;

        av_dict_set(&chapter->metadata, "title", val,
                         AV_DICT_DONT_STRDUP_VAL);
    } else
        return 0;

    av_free(key);
    return 1;
}

int
ff_vorbis_comment(AVFormatContext * as, AVDictionary **m, const uint8_t *buf, int size)
{
    const uint8_t *p = buf;
    const uint8_t *end = buf + size;
    unsigned n, j;
    int s;

    if (size < 8) /* must have vendor_length and user_comment_list_length */
        return -1;

    s = bytestream_get_le32(&p);

    if (end - p - 4 < s || s < 0)
        return -1;

    p += s;

    n = bytestream_get_le32(&p);

    while (end - p >= 4 && n > 0) {
        const char *t, *v;
        int tl, vl;

        s = bytestream_get_le32(&p);

        if (end - p < s || s < 0)
            break;

        t = p;
        p += s;
        n--;

        v = memchr(t, '=', s);
        if (!v)
            continue;

        tl = v - t;
        vl = s - tl - 1;
        v++;

        if (tl && vl) {
            char *tt, *ct;

            tt = av_malloc(tl + 1);
            ct = av_malloc(vl + 1);
            if (!tt || !ct) {
                av_freep(&tt);
                av_freep(&ct);
                av_log(as, AV_LOG_WARNING, "out-of-memory error. skipping VorbisComment tag.\n");
                continue;
            }

            for (j = 0; j < tl; j++)
                tt[j] = av_toupper(t[j]);
            tt[tl] = 0;

            memcpy(ct, v, vl);
            ct[vl] = 0;

            if (!ogm_chapter(as, tt, ct))
                av_dict_set(m, tt, ct,
                                   AV_DICT_DONT_STRDUP_KEY |
                                   AV_DICT_DONT_STRDUP_VAL);
        }
    }

    if (p != end)
        av_log(as, AV_LOG_INFO, "%ti bytes of comment header remain\n", end-p);
    if (n > 0)
        av_log(as, AV_LOG_INFO,
               "truncated comment header, %i comments not found\n", n);

    ff_metadata_conv(m, NULL, ff_vorbiscomment_metadata_conv);

    return 0;
}


/** Parse the vorbis header
 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
 * [vorbis_version] = read 32 bits as unsigned integer | Not used
 * [audio_channels] = read 8 bit integer as unsigned | Used
 * [audio_sample_rate] = read 32 bits as unsigned integer | Used
 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
 * [blocksize_0] = read 4 bits as unsigned integer | Not Used
 * [blocksize_1] = read 4 bits as unsigned integer | Not Used
 * [framing_flag] = read one bit | Not Used
 *    */

struct oggvorbis_private {
    unsigned int len[3];
    unsigned char *packet[3];
    VorbisParseContext vp;
    int64_t final_pts;
    int final_duration;
};


static unsigned int
fixup_vorbis_headers(AVFormatContext * as, struct oggvorbis_private *priv,
                     uint8_t **buf)
{
    int i, offset, len, err;
    unsigned char *ptr;

    len = priv->len[0] + priv->len[1] + priv->len[2];
    ptr = *buf = av_mallocz(len + len/255 + 64);

    ptr[0] = 2;
    offset = 1;
    offset += av_xiphlacing(&ptr[offset], priv->len[0]);
    offset += av_xiphlacing(&ptr[offset], priv->len[1]);
    for (i = 0; i < 3; i++) {
        memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
        offset += priv->len[i];
        av_freep(&priv->packet[i]);
    }
    if ((err = av_reallocp(buf, offset + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
        return err;
    return offset;
}

static void vorbis_cleanup(AVFormatContext *s, int idx)
{
    struct ogg *ogg = s->priv_data;
    struct ogg_stream *os = ogg->streams + idx;
    struct oggvorbis_private *priv = os->private;
    int i;
    if (os->private)
        for (i = 0; i < 3; i++)
            av_freep(&priv->packet[i]);
}

static int
vorbis_header (AVFormatContext * s, int idx)
{
    struct ogg *ogg = s->priv_data;
    struct ogg_stream *os = ogg->streams + idx;
    AVStream *st = s->streams[idx];
    struct oggvorbis_private *priv;
    int pkt_type = os->buf[os->pstart];

    if (!os->private) {
        os->private = av_mallocz(sizeof(struct oggvorbis_private));
        if (!os->private)
            return 0;
    }

    if (!(pkt_type & 1))
        return 0;

    if (os->psize < 1 || pkt_type > 5)
        return -1;

    priv = os->private;

    if (priv->packet[pkt_type>>1])
        return -1;
    if (pkt_type > 1 && !priv->packet[0] || pkt_type > 3 && !priv->packet[1])
        return -1;

    priv->len[pkt_type >> 1] = os->psize;
    priv->packet[pkt_type >> 1] = av_mallocz(os->psize);
    memcpy(priv->packet[pkt_type >> 1], os->buf + os->pstart, os->psize);
    if (os->buf[os->pstart] == 1) {
        const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
        unsigned blocksize, bs0, bs1;
        int srate;

        if (os->psize != 30)
            return -1;

        if (bytestream_get_le32(&p) != 0) /* vorbis_version */
            return -1;

        st->codec->channels = bytestream_get_byte(&p);
        srate = bytestream_get_le32(&p);
        p += 4; // skip maximum bitrate
        st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
        p += 4; // skip minimum bitrate

        blocksize = bytestream_get_byte(&p);
        bs0 = blocksize & 15;
        bs1 = blocksize >> 4;

        if (bs0 > bs1)
            return -1;
        if (bs0 < 6 || bs1 > 13)
            return -1;

        if (bytestream_get_byte(&p) != 1) /* framing_flag */
            return -1;

        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
        st->codec->codec_id = AV_CODEC_ID_VORBIS;

        if (srate > 0) {
            st->codec->sample_rate = srate;
            avpriv_set_pts_info(st, 64, 1, srate);
        }
    } else if (os->buf[os->pstart] == 3) {
        if (os->psize > 8 &&
            ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8) >= 0) {
            // drop all metadata we parsed and which is not required by libvorbis
            unsigned new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1;
            if (new_len >= 16 && new_len < os->psize) {
                AV_WL32(priv->packet[1] + new_len - 5, 0);
                priv->packet[1][new_len - 1] = 1;
                priv->len[1] = new_len;
            }
        }
    } else {
        int ret;
        st->codec->extradata_size =
            fixup_vorbis_headers(s, priv, &st->codec->extradata);
        if ((ret = avpriv_vorbis_parse_extradata(st->codec, &priv->vp))) {
            av_freep(&st->codec->extradata);
            st->codec->extradata_size = 0;
            return ret;
        }
    }

    return 1;
}

static int vorbis_packet(AVFormatContext *s, int idx)
{
    struct ogg *ogg = s->priv_data;
    struct ogg_stream *os = ogg->streams + idx;
    struct oggvorbis_private *priv = os->private;
    int duration;

    /* first packet handling
       here we parse the duration of each packet in the first page and compare
       the total duration to the page granule to find the encoder delay and
       set the first timestamp */
    if (!os->lastpts) {
        int seg;
        uint8_t *last_pkt = os->buf + os->pstart;
        uint8_t *next_pkt = last_pkt;
        int first_duration = 0;

        avpriv_vorbis_parse_reset(&priv->vp);
        duration = 0;
        for (seg = 0; seg < os->nsegs; seg++) {
            if (os->segments[seg] < 255) {
                int d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1);
                if (d < 0) {
                    duration = os->granule;
                    break;
                }
                if (!duration)
                    first_duration = d;
                duration += d;
                last_pkt = next_pkt + os->segments[seg];
            }
            next_pkt += os->segments[seg];
        }
        os->lastpts = os->lastdts   = os->granule - duration;
        s->streams[idx]->start_time = os->lastpts + first_duration;
        if (s->streams[idx]->duration)
            s->streams[idx]->duration -= s->streams[idx]->start_time;
        s->streams[idx]->cur_dts    = AV_NOPTS_VALUE;
        priv->final_pts             = AV_NOPTS_VALUE;
        avpriv_vorbis_parse_reset(&priv->vp);
    }

    /* parse packet duration */
    if (os->psize > 0) {
        duration = avpriv_vorbis_parse_frame(&priv->vp, os->buf + os->pstart, 1);
        if (duration <= 0) {
            os->pflags |= AV_PKT_FLAG_CORRUPT;
            return 0;
        }
        os->pduration = duration;
    }

    /* final packet handling
       here we save the pts of the first packet in the final page, sum up all
       packet durations in the final page except for the last one, and compare
       to the page granule to find the duration of the final packet */
    if (os->flags & OGG_FLAG_EOS) {
        if (os->lastpts != AV_NOPTS_VALUE) {
            priv->final_pts = os->lastpts;
            priv->final_duration = 0;
        }
        if (os->segp == os->nsegs)
            os->pduration = os->granule - priv->final_pts - priv->final_duration;
        priv->final_duration += os->pduration;
    }

    return 0;
}

const struct ogg_codec ff_vorbis_codec = {
    .magic = "\001vorbis",
    .magicsize = 7,
    .header = vorbis_header,
    .packet = vorbis_packet,
    .cleanup= vorbis_cleanup,
    .nb_header = 3,
};