1/** 2 Copyright (C) 2005 Michael Ahlberg, M��ns Rullg��rd 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 33int 34vorbis_comment(AVFormatContext * as, uint8_t *buf, int size) 35{ 36 const uint8_t *p = buf; 37 const uint8_t *end = buf + size; 38 unsigned n, j; 39 int s; 40 41 if (size < 8) /* must have vendor_length and user_comment_list_length */ 42 return -1; 43 44 s = bytestream_get_le32(&p); 45 46 if (end - p - 4 < s || s < 0) 47 return -1; 48 49 p += s; 50 51 n = bytestream_get_le32(&p); 52 53 while (end - p >= 4 && n > 0) { 54 const char *t, *v; 55 int tl, vl; 56 57 s = bytestream_get_le32(&p); 58 59 if (end - p < s || s < 0) 60 break; 61 62 t = p; 63 p += s; 64 n--; 65 66 v = memchr(t, '=', s); 67 if (!v) 68 continue; 69 70 tl = v - t; 71 vl = s - tl - 1; 72 v++; 73 74 if (tl && vl) { 75 char *tt, *ct; 76 77 tt = av_malloc(tl + 1); 78 ct = av_malloc(vl + 1); 79 if (!tt || !ct) { 80 av_freep(&tt); 81 av_freep(&ct); 82 av_log(as, AV_LOG_WARNING, "out-of-memory error. skipping VorbisComment tag.\n"); 83 continue; 84 } 85 86 for (j = 0; j < tl; j++) 87 tt[j] = toupper(t[j]); 88 tt[tl] = 0; 89 90 memcpy(ct, v, vl); 91 ct[vl] = 0; 92 93 av_metadata_set(&as->metadata, tt, ct); 94 95 av_freep(&tt); 96 av_freep(&ct); 97 } 98 } 99 100 if (p != end) 101 av_log(as, AV_LOG_INFO, "%ti bytes of comment header remain\n", p-end); 102 if (n > 0) 103 av_log(as, AV_LOG_INFO, 104 "truncated comment header, %i comments not found\n", n); 105 106 return 0; 107} 108 109 110/** Parse the vorbis header 111 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec 112 * [vorbis_version] = read 32 bits as unsigned integer | Not used 113 * [audio_channels] = read 8 bit integer as unsigned | Used 114 * [audio_sample_rate] = read 32 bits as unsigned integer | Used 115 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet 116 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet 117 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate 118 * [blocksize_0] = read 4 bits as unsigned integer | Not Used 119 * [blocksize_1] = read 4 bits as unsigned integer | Not Used 120 * [framing_flag] = read one bit | Not Used 121 * */ 122 123struct oggvorbis_private { 124 unsigned int len[3]; 125 unsigned char *packet[3]; 126}; 127 128 129static unsigned int 130fixup_vorbis_headers(AVFormatContext * as, struct oggvorbis_private *priv, 131 uint8_t **buf) 132{ 133 int i,offset, len; 134 unsigned char *ptr; 135 136 len = priv->len[0] + priv->len[1] + priv->len[2]; 137 ptr = *buf = av_mallocz(len + len/255 + 64); 138 139 ptr[0] = 2; 140 offset = 1; 141 offset += av_xiphlacing(&ptr[offset], priv->len[0]); 142 offset += av_xiphlacing(&ptr[offset], priv->len[1]); 143 for (i = 0; i < 3; i++) { 144 memcpy(&ptr[offset], priv->packet[i], priv->len[i]); 145 offset += priv->len[i]; 146 } 147 *buf = av_realloc(*buf, offset + FF_INPUT_BUFFER_PADDING_SIZE); 148 return offset; 149} 150 151 152static int 153vorbis_header (AVFormatContext * s, int idx) 154{ 155 struct ogg *ogg = s->priv_data; 156 struct ogg_stream *os = ogg->streams + idx; 157 AVStream *st = s->streams[idx]; 158 struct oggvorbis_private *priv; 159 160 if (os->seq > 2) 161 return 0; 162 163 if (os->seq == 0) { 164 os->private = av_mallocz(sizeof(struct oggvorbis_private)); 165 if (!os->private) 166 return 0; 167 } 168 169 if (os->psize < 1) 170 return -1; 171 172 priv = os->private; 173 priv->len[os->seq] = os->psize; 174 priv->packet[os->seq] = av_mallocz(os->psize); 175 memcpy(priv->packet[os->seq], os->buf + os->pstart, os->psize); 176 if (os->buf[os->pstart] == 1) { 177 const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */ 178 unsigned blocksize, bs0, bs1; 179 180 if (os->psize != 30) 181 return -1; 182 183 if (bytestream_get_le32(&p) != 0) /* vorbis_version */ 184 return -1; 185 186 st->codec->channels = bytestream_get_byte(&p); 187 st->codec->sample_rate = bytestream_get_le32(&p); 188 p += 4; // skip maximum bitrate 189 st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate 190 p += 4; // skip minimum bitrate 191 192 blocksize = bytestream_get_byte(&p); 193 bs0 = blocksize & 15; 194 bs1 = blocksize >> 4; 195 196 if (bs0 > bs1) 197 return -1; 198 if (bs0 < 6 || bs1 > 13) 199 return -1; 200 201 if (bytestream_get_byte(&p) != 1) /* framing_flag */ 202 return -1; 203 204 st->codec->codec_type = CODEC_TYPE_AUDIO; 205 st->codec->codec_id = CODEC_ID_VORBIS; 206 207 st->time_base.num = 1; 208 st->time_base.den = st->codec->sample_rate; 209 } else if (os->buf[os->pstart] == 3) { 210 if (os->psize > 8) 211 vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8); 212 } else { 213 st->codec->extradata_size = 214 fixup_vorbis_headers(s, priv, &st->codec->extradata); 215 } 216 217 return os->seq < 3; 218} 219 220const struct ogg_codec ff_vorbis_codec = { 221 .magic = "\001vorbis", 222 .magicsize = 7, 223 .header = vorbis_header 224}; 225