use av_malloc() in vorbis_comment()
[libav.git] / libavformat / oggparsevorbis.c
1 /**
2 Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
3
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:
11
12 The above copyright notice and this permission notice shall be
13 included in all copies or substantial portions of the Software.
14
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.
23 **/
24
25 #include <stdlib.h>
26 #include "libavutil/avstring.h"
27 #include "libavutil/bswap.h"
28 #include "libavcodec/bitstream.h"
29 #include "libavcodec/bytestream.h"
30 #include "avformat.h"
31 #include "oggdec.h"
32
33 int
34 vorbis_comment(AVFormatContext * as, uint8_t *buf, int size)
35 {
36 const uint8_t *p = buf;
37 const uint8_t *end = buf + size;
38 unsigned s, n, j;
39
40 if (size < 8) /* must have vendor_length and user_comment_list_length */
41 return -1;
42
43 s = bytestream_get_le32(&p);
44
45 if (end - p < s)
46 return -1;
47
48 p += s;
49
50 n = bytestream_get_le32(&p);
51
52 while (p < end && n > 0) {
53 const char *t, *v;
54 int tl, vl;
55
56 s = bytestream_get_le32(&p);
57
58 if (end - p < s)
59 break;
60
61 t = p;
62 p += s;
63 n--;
64
65 v = memchr(t, '=', s);
66 if (!v)
67 continue;
68
69 tl = v - t;
70 vl = s - tl - 1;
71 v++;
72
73 if (tl && vl) {
74 char *tt, *ct;
75
76 tt = av_malloc(tl + 1);
77 ct = av_malloc(vl + 1);
78 if (!tt || !ct) {
79 av_freep(&tt);
80 av_freep(&ct);
81 av_log(as, AV_LOG_WARNING, "out-of-memory error. skipping VorbisComment tag.\n");
82 continue;
83 }
84
85 for (j = 0; j < tl; j++)
86 tt[j] = toupper(t[j]);
87 tt[tl] = 0;
88
89 memcpy(ct, v, vl);
90 ct[vl] = 0;
91
92 av_metadata_set(&as->metadata, tt, ct);
93
94 av_freep(&tt);
95 av_freep(&ct);
96 }
97 }
98
99 if (p != end)
100 av_log(as, AV_LOG_INFO, "%ti bytes of comment header remain\n", p-end);
101 if (n > 0)
102 av_log(as, AV_LOG_INFO,
103 "truncated comment header, %i comments not found\n", n);
104
105 return 0;
106 }
107
108
109 /** Parse the vorbis header
110 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
111 * [vorbis_version] = read 32 bits as unsigned integer | Not used
112 * [audio_channels] = read 8 bit integer as unsigned | Used
113 * [audio_sample_rate] = read 32 bits as unsigned integer | Used
114 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
115 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
116 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
117 * [blocksize_0] = read 4 bits as unsigned integer | Not Used
118 * [blocksize_1] = read 4 bits as unsigned integer | Not Used
119 * [framing_flag] = read one bit | Not Used
120 * */
121
122 struct oggvorbis_private {
123 unsigned int len[3];
124 unsigned char *packet[3];
125 };
126
127
128 static unsigned int
129 fixup_vorbis_headers(AVFormatContext * as, struct oggvorbis_private *priv,
130 uint8_t **buf)
131 {
132 int i,offset, len;
133 unsigned char *ptr;
134
135 len = priv->len[0] + priv->len[1] + priv->len[2];
136 ptr = *buf = av_mallocz(len + len/255 + 64);
137
138 ptr[0] = 2;
139 offset = 1;
140 offset += av_xiphlacing(&ptr[offset], priv->len[0]);
141 offset += av_xiphlacing(&ptr[offset], priv->len[1]);
142 for (i = 0; i < 3; i++) {
143 memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
144 offset += priv->len[i];
145 }
146 *buf = av_realloc(*buf, offset + FF_INPUT_BUFFER_PADDING_SIZE);
147 return offset;
148 }
149
150
151 static int
152 vorbis_header (AVFormatContext * s, int idx)
153 {
154 struct ogg *ogg = s->priv_data;
155 struct ogg_stream *os = ogg->streams + idx;
156 AVStream *st = s->streams[idx];
157 struct oggvorbis_private *priv;
158
159 if (os->seq > 2)
160 return 0;
161
162 if (os->seq == 0) {
163 os->private = av_mallocz(sizeof(struct oggvorbis_private));
164 if (!os->private)
165 return 0;
166 }
167
168 if (os->psize < 1)
169 return -1;
170
171 priv = os->private;
172 priv->len[os->seq] = os->psize;
173 priv->packet[os->seq] = av_mallocz(os->psize);
174 memcpy(priv->packet[os->seq], os->buf + os->pstart, os->psize);
175 if (os->buf[os->pstart] == 1) {
176 const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
177 unsigned blocksize, bs0, bs1;
178
179 if (os->psize != 30)
180 return -1;
181
182 if (bytestream_get_le32(&p) != 0) /* vorbis_version */
183 return -1;
184
185 st->codec->channels = bytestream_get_byte(&p);
186 st->codec->sample_rate = bytestream_get_le32(&p);
187 p += 4; // skip maximum bitrate
188 st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
189 p += 4; // skip minimum bitrate
190
191 blocksize = bytestream_get_byte(&p);
192 bs0 = blocksize & 15;
193 bs1 = blocksize >> 4;
194
195 if (bs0 > bs1)
196 return -1;
197 if (bs0 < 6 || bs1 > 13)
198 return -1;
199
200 if (bytestream_get_byte(&p) != 1) /* framing_flag */
201 return -1;
202
203 st->codec->codec_type = CODEC_TYPE_AUDIO;
204 st->codec->codec_id = CODEC_ID_VORBIS;
205
206 st->time_base.num = 1;
207 st->time_base.den = st->codec->sample_rate;
208 } else if (os->buf[os->pstart] == 3) {
209 if (os->psize > 8)
210 vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
211 } else {
212 st->codec->extradata_size =
213 fixup_vorbis_headers(s, priv, &st->codec->extradata);
214 }
215
216 return os->seq < 3;
217 }
218
219 const struct ogg_codec ff_vorbis_codec = {
220 .magic = "\001vorbis",
221 .magicsize = 7,
222 .header = vorbis_header
223 };