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00043 #include "avformat.h"
00044 #include "internal.h"
00045 #include "libavutil/intreadwrite.h"
00046 #include "libavutil/des.h"
00047 #include "oma.h"
00048 #include "pcm.h"
00049 #include "riff.h"
00050 #include "id3v2.h"
00051
00052
00053 static const uint64_t leaf_table[] = {
00054 0xd79e8283acea4620, 0x7a9762f445afd0d8,
00055 0x354d60a60b8c79f1, 0x584e1cde00b07aee,
00056 0x1573cd93da7df623, 0x47f98d79620dd535
00057 };
00058
00059 typedef struct OMAContext {
00060 uint64_t content_start;
00061 int encrypted;
00062 uint16_t k_size;
00063 uint16_t e_size;
00064 uint16_t i_size;
00065 uint16_t s_size;
00066 uint32_t rid;
00067 uint8_t r_val[24];
00068 uint8_t n_val[24];
00069 uint8_t m_val[8];
00070 uint8_t s_val[8];
00071 uint8_t sm_val[8];
00072 uint8_t e_val[8];
00073 uint8_t iv[8];
00074 struct AVDES av_des;
00075 } OMAContext;
00076
00077 static void hex_log(AVFormatContext *s, int level, const char *name, const uint8_t *value, int len)
00078 {
00079 char buf[33];
00080 len = FFMIN(len, 16);
00081 if (av_log_get_level() < level)
00082 return;
00083 ff_data_to_hex(buf, value, len, 1);
00084 buf[len<<1] = '\0';
00085 av_log(s, level, "%s: %s\n", name, buf);
00086 }
00087
00088 static int kset(AVFormatContext *s, const uint8_t *r_val, const uint8_t *n_val, int len)
00089 {
00090 OMAContext *oc = s->priv_data;
00091
00092 if (!r_val && !n_val)
00093 return -1;
00094
00095 len = FFMIN(len, 16);
00096
00097
00098 if (r_val) {
00099 if (r_val != oc->r_val) {
00100 memset(oc->r_val, 0, 24);
00101 memcpy(oc->r_val, r_val, len);
00102 }
00103 memcpy(&oc->r_val[16], r_val, 8);
00104 }
00105 if (n_val) {
00106 if (n_val != oc->n_val) {
00107 memset(oc->n_val, 0, 24);
00108 memcpy(oc->n_val, n_val, len);
00109 }
00110 memcpy(&oc->n_val[16], n_val, 8);
00111 }
00112
00113 return 0;
00114 }
00115
00116 #define OMA_RPROBE_M_VAL 48 + 1
00117
00118 static int rprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
00119 const uint8_t *r_val)
00120 {
00121 OMAContext *oc = s->priv_data;
00122 unsigned int pos;
00123 struct AVDES av_des;
00124
00125 if (!enc_header || !r_val ||
00126 size < OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size ||
00127 size < OMA_RPROBE_M_VAL)
00128 return -1;
00129
00130
00131 av_des_init(&av_des, r_val, 192, 1);
00132 av_des_crypt(&av_des, oc->m_val, &enc_header[48], 1, NULL, 1);
00133
00134
00135 av_des_init(&av_des, oc->m_val, 64, 0);
00136 av_des_crypt(&av_des, oc->s_val, NULL, 1, NULL, 0);
00137
00138
00139 pos = OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size;
00140 av_des_init(&av_des, oc->s_val, 64, 0);
00141 av_des_mac(&av_des, oc->sm_val, &enc_header[pos], (oc->i_size >> 3));
00142
00143 pos += oc->i_size;
00144
00145 return memcmp(&enc_header[pos], oc->sm_val, 8) ? -1 : 0;
00146 }
00147
00148 static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
00149 const uint8_t *n_val)
00150 {
00151 OMAContext *oc = s->priv_data;
00152 uint64_t pos;
00153 uint32_t taglen, datalen;
00154 struct AVDES av_des;
00155
00156 if (!enc_header || !n_val ||
00157 size < OMA_ENC_HEADER_SIZE + oc->k_size + 4)
00158 return -1;
00159
00160 pos = OMA_ENC_HEADER_SIZE + oc->k_size;
00161 if (!memcmp(&enc_header[pos], "EKB ", 4))
00162 pos += 32;
00163
00164 if (size < pos + 44)
00165 return -1;
00166
00167 if (AV_RB32(&enc_header[pos]) != oc->rid)
00168 av_log(s, AV_LOG_DEBUG, "Mismatching RID\n");
00169
00170 taglen = AV_RB32(&enc_header[pos+32]);
00171 datalen = AV_RB32(&enc_header[pos+36]) >> 4;
00172
00173 pos += 44;
00174 if (size - pos < taglen)
00175 return -1;
00176
00177 pos += taglen;
00178
00179 if (datalen << 4 > size - pos)
00180 return -1;
00181
00182 av_des_init(&av_des, n_val, 192, 1);
00183 while (datalen-- > 0) {
00184 av_des_crypt(&av_des, oc->r_val, &enc_header[pos], 2, NULL, 1);
00185 kset(s, oc->r_val, NULL, 16);
00186 if (!rprobe(s, enc_header, size, oc->r_val))
00187 return 0;
00188 pos += 16;
00189 }
00190
00191 return -1;
00192 }
00193
00194 static int decrypt_init(AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
00195 {
00196 OMAContext *oc = s->priv_data;
00197 ID3v2ExtraMetaGEOB *geob = NULL;
00198 uint8_t *gdata;
00199
00200 oc->encrypted = 1;
00201 av_log(s, AV_LOG_INFO, "File is encrypted\n");
00202
00203
00204 while (em) {
00205 if (!strcmp(em->tag, "GEOB") &&
00206 (geob = em->data) &&
00207 (!strcmp(geob->description, "OMG_LSI") ||
00208 !strcmp(geob->description, "OMG_BKLSI"))) {
00209 break;
00210 }
00211 em = em->next;
00212 }
00213 if (!em) {
00214 av_log(s, AV_LOG_ERROR, "No encryption header found\n");
00215 return -1;
00216 }
00217
00218 if (geob->datasize < 64) {
00219 av_log(s, AV_LOG_ERROR, "Invalid GEOB data size: %u\n", geob->datasize);
00220 return -1;
00221 }
00222
00223 gdata = geob->data;
00224
00225 if (AV_RB16(gdata) != 1)
00226 av_log(s, AV_LOG_WARNING, "Unknown version in encryption header\n");
00227
00228 oc->k_size = AV_RB16(&gdata[2]);
00229 oc->e_size = AV_RB16(&gdata[4]);
00230 oc->i_size = AV_RB16(&gdata[6]);
00231 oc->s_size = AV_RB16(&gdata[8]);
00232
00233 if (memcmp(&gdata[OMA_ENC_HEADER_SIZE], "KEYRING ", 12)) {
00234 av_log(s, AV_LOG_ERROR, "Invalid encryption header\n");
00235 return -1;
00236 }
00237 oc->rid = AV_RB32(&gdata[OMA_ENC_HEADER_SIZE + 28]);
00238 av_log(s, AV_LOG_DEBUG, "RID: %.8x\n", oc->rid);
00239
00240 memcpy(oc->iv, &header[0x58], 8);
00241 hex_log(s, AV_LOG_DEBUG, "IV", oc->iv, 8);
00242
00243 hex_log(s, AV_LOG_DEBUG, "CBC-MAC", &gdata[OMA_ENC_HEADER_SIZE+oc->k_size+oc->e_size+oc->i_size], 8);
00244
00245 if (s->keylen > 0) {
00246 kset(s, s->key, s->key, s->keylen);
00247 }
00248 if (!memcmp(oc->r_val, (const uint8_t[8]){0}, 8) ||
00249 rprobe(s, gdata, geob->datasize, oc->r_val) < 0 &&
00250 nprobe(s, gdata, geob->datasize, oc->n_val) < 0) {
00251 int i;
00252 for (i = 0; i < FF_ARRAY_ELEMS(leaf_table); i += 2) {
00253 uint8_t buf[16];
00254 AV_WL64(buf, leaf_table[i]);
00255 AV_WL64(&buf[8], leaf_table[i+1]);
00256 kset(s, buf, buf, 16);
00257 if (!rprobe(s, gdata, geob->datasize, oc->r_val) ||
00258 !nprobe(s, gdata, geob->datasize, oc->n_val))
00259 break;
00260 }
00261 if (i >= sizeof(leaf_table)) {
00262 av_log(s, AV_LOG_ERROR, "Invalid key\n");
00263 return -1;
00264 }
00265 }
00266
00267
00268 av_des_init(&oc->av_des, oc->m_val, 64, 0);
00269 av_des_crypt(&oc->av_des, oc->e_val, &gdata[OMA_ENC_HEADER_SIZE + 40], 1, NULL, 0);
00270 hex_log(s, AV_LOG_DEBUG, "EK", oc->e_val, 8);
00271
00272
00273 av_des_init(&oc->av_des, oc->e_val, 64, 1);
00274
00275 return 0;
00276 }
00277
00278 static int oma_read_header(AVFormatContext *s,
00279 AVFormatParameters *ap)
00280 {
00281 int ret, framesize, jsflag, samplerate;
00282 uint32_t codec_params;
00283 int16_t eid;
00284 uint8_t buf[EA3_HEADER_SIZE];
00285 uint8_t *edata;
00286 AVStream *st;
00287 ID3v2ExtraMeta *extra_meta = NULL;
00288 OMAContext *oc = s->priv_data;
00289
00290 ff_id3v2_read_all(s, ID3v2_EA3_MAGIC, &extra_meta);
00291 ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
00292 if (ret < EA3_HEADER_SIZE)
00293 return -1;
00294
00295 if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}),3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
00296 av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
00297 return -1;
00298 }
00299
00300 oc->content_start = avio_tell(s->pb);
00301
00302
00303 eid = AV_RB16(&buf[6]);
00304 if (eid != -1 && eid != -128 && decrypt_init(s, extra_meta, buf) < 0) {
00305 ff_id3v2_free_extra_meta(&extra_meta);
00306 return -1;
00307 }
00308
00309 ff_id3v2_free_extra_meta(&extra_meta);
00310
00311 codec_params = AV_RB24(&buf[33]);
00312
00313 st = avformat_new_stream(s, NULL);
00314 if (!st)
00315 return AVERROR(ENOMEM);
00316
00317 st->start_time = 0;
00318 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00319 st->codec->codec_tag = buf[32];
00320 st->codec->codec_id = ff_codec_get_id(ff_oma_codec_tags, st->codec->codec_tag);
00321
00322 switch (buf[32]) {
00323 case OMA_CODECID_ATRAC3:
00324 samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
00325 if (!samplerate) {
00326 av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
00327 return AVERROR_INVALIDDATA;
00328 }
00329 if (samplerate != 44100)
00330 av_log_ask_for_sample(s, "Unsupported sample rate: %d\n",
00331 samplerate);
00332
00333 framesize = (codec_params & 0x3FF) * 8;
00334 jsflag = (codec_params >> 17) & 1;
00335 st->codec->channels = 2;
00336 st->codec->sample_rate = samplerate;
00337 st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024;
00338
00339
00340 st->codec->extradata_size = 14;
00341 edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE);
00342 if (!edata)
00343 return AVERROR(ENOMEM);
00344
00345 st->codec->extradata = edata;
00346 AV_WL16(&edata[0], 1);
00347 AV_WL32(&edata[2], samplerate);
00348 AV_WL16(&edata[6], jsflag);
00349 AV_WL16(&edata[8], jsflag);
00350 AV_WL16(&edata[10], 1);
00351
00352
00353 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
00354 break;
00355 case OMA_CODECID_ATRAC3P:
00356 st->codec->channels = (codec_params >> 10) & 7;
00357 framesize = ((codec_params & 0x3FF) * 8) + 8;
00358 samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
00359 if (!samplerate) {
00360 av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
00361 return AVERROR_INVALIDDATA;
00362 }
00363 st->codec->sample_rate = samplerate;
00364 st->codec->bit_rate = samplerate * framesize * 8 / 1024;
00365 avpriv_set_pts_info(st, 64, 1, samplerate);
00366 av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n");
00367 break;
00368 case OMA_CODECID_MP3:
00369 st->need_parsing = AVSTREAM_PARSE_FULL;
00370 framesize = 1024;
00371 break;
00372 case OMA_CODECID_LPCM:
00373
00374 st->codec->channels = 2;
00375 st->codec->sample_rate = 44100;
00376 framesize = 1024;
00377
00378 st->codec->bit_rate = st->codec->sample_rate * 32;
00379 st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
00380 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
00381 break;
00382 default:
00383 av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]);
00384 return -1;
00385 }
00386
00387 st->codec->block_align = framesize;
00388
00389 return 0;
00390 }
00391
00392
00393 static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
00394 {
00395 OMAContext *oc = s->priv_data;
00396 int packet_size = s->streams[0]->codec->block_align;
00397 int ret = av_get_packet(s->pb, pkt, packet_size);
00398
00399 if (ret < packet_size)
00400 pkt->flags |= AV_PKT_FLAG_CORRUPT;
00401
00402 if (ret <= 0)
00403 return AVERROR(EIO);
00404
00405 pkt->stream_index = 0;
00406
00407 if (oc->encrypted) {
00408
00409
00410 if (ret == packet_size)
00411 av_des_crypt(&oc->av_des, pkt->data, pkt->data,
00412 (packet_size >> 3), oc->iv, 1);
00413 else
00414 memset(oc->iv, 0, 8);
00415 }
00416
00417 return ret;
00418 }
00419
00420 static int oma_read_probe(AVProbeData *p)
00421 {
00422 const uint8_t *buf;
00423 unsigned tag_len = 0;
00424
00425 buf = p->buf;
00426
00427 if (p->buf_size < ID3v2_HEADER_SIZE ||
00428 !ff_id3v2_match(buf, ID3v2_EA3_MAGIC) ||
00429 buf[3] != 3 ||
00430 buf[4])
00431 return 0;
00432
00433 tag_len = ff_id3v2_tag_len(buf);
00434
00435
00436 if (p->buf_size < tag_len + 5)
00437
00438 return AVPROBE_SCORE_MAX / 2;
00439
00440 buf += tag_len;
00441
00442 if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE)
00443 return AVPROBE_SCORE_MAX;
00444 else
00445 return 0;
00446 }
00447
00448 static int oma_read_seek(struct AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
00449 {
00450 OMAContext *oc = s->priv_data;
00451
00452 int err = pcm_read_seek(s, stream_index, timestamp, flags);
00453
00454 if (!oc->encrypted)
00455 return err;
00456
00457
00458 if (err || avio_tell(s->pb) < oc->content_start)
00459 goto wipe;
00460 if ((err = avio_seek(s->pb, -8, SEEK_CUR)) < 0)
00461 goto wipe;
00462 if ((err = avio_read(s->pb, oc->iv, 8)) < 8) {
00463 if (err >= 0)
00464 err = AVERROR_EOF;
00465 goto wipe;
00466 }
00467
00468 return 0;
00469 wipe:
00470 memset(oc->iv, 0, 8);
00471 return err;
00472 }
00473
00474 AVInputFormat ff_oma_demuxer = {
00475 .name = "oma",
00476 .long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
00477 .priv_data_size = sizeof(OMAContext),
00478 .read_probe = oma_read_probe,
00479 .read_header = oma_read_header,
00480 .read_packet = oma_read_packet,
00481 .read_seek = oma_read_seek,
00482 .flags = AVFMT_GENERIC_INDEX,
00483 .extensions = "oma,omg,aa3",
00484 .codec_tag = (const AVCodecTag* const []){ff_oma_codec_tags, 0},
00485 };
00486