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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 + taglen;
00174
00175 if (datalen << 4 > size - pos)
00176 return -1;
00177
00178 av_des_init(&av_des, n_val, 192, 1);
00179 while (datalen-- > 0) {
00180 av_des_crypt(&av_des, oc->r_val, &enc_header[pos], 2, NULL, 1);
00181 kset(s, oc->r_val, NULL, 16);
00182 if (!rprobe(s, enc_header, size, oc->r_val))
00183 return 0;
00184 pos += 16;
00185 }
00186
00187 return -1;
00188 }
00189
00190 static int decrypt_init(AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
00191 {
00192 OMAContext *oc = s->priv_data;
00193 ID3v2ExtraMetaGEOB *geob = NULL;
00194 uint8_t *gdata;
00195
00196 oc->encrypted = 1;
00197 av_log(s, AV_LOG_INFO, "File is encrypted\n");
00198
00199
00200 while (em) {
00201 if (!strcmp(em->tag, "GEOB") &&
00202 (geob = em->data) &&
00203 (!strcmp(geob->description, "OMG_LSI") ||
00204 !strcmp(geob->description, "OMG_BKLSI"))) {
00205 break;
00206 }
00207 em = em->next;
00208 }
00209 if (!em) {
00210 av_log(s, AV_LOG_ERROR, "No encryption header found\n");
00211 return -1;
00212 }
00213
00214 if (geob->datasize < 64) {
00215 av_log(s, AV_LOG_ERROR, "Invalid GEOB data size: %u\n", geob->datasize);
00216 return -1;
00217 }
00218
00219 gdata = geob->data;
00220
00221 if (AV_RB16(gdata) != 1)
00222 av_log(s, AV_LOG_WARNING, "Unknown version in encryption header\n");
00223
00224 oc->k_size = AV_RB16(&gdata[2]);
00225 oc->e_size = AV_RB16(&gdata[4]);
00226 oc->i_size = AV_RB16(&gdata[6]);
00227 oc->s_size = AV_RB16(&gdata[8]);
00228
00229 if (memcmp(&gdata[OMA_ENC_HEADER_SIZE], "KEYRING ", 12)) {
00230 av_log(s, AV_LOG_ERROR, "Invalid encryption header\n");
00231 return -1;
00232 }
00233 oc->rid = AV_RB32(&gdata[OMA_ENC_HEADER_SIZE + 28]);
00234 av_log(s, AV_LOG_DEBUG, "RID: %.8x\n", oc->rid);
00235
00236 memcpy(oc->iv, &header[0x58], 8);
00237 hex_log(s, AV_LOG_DEBUG, "IV", oc->iv, 8);
00238
00239 hex_log(s, AV_LOG_DEBUG, "CBC-MAC", &gdata[OMA_ENC_HEADER_SIZE+oc->k_size+oc->e_size+oc->i_size], 8);
00240
00241 if (s->keylen > 0) {
00242 kset(s, s->key, s->key, s->keylen);
00243 }
00244 if (!memcmp(oc->r_val, (const uint8_t[8]){0}, 8) ||
00245 rprobe(s, gdata, geob->datasize, oc->r_val) < 0 &&
00246 nprobe(s, gdata, geob->datasize, oc->n_val) < 0) {
00247 int i;
00248 for (i = 0; i < FF_ARRAY_ELEMS(leaf_table); i += 2) {
00249 uint8_t buf[16];
00250 AV_WL64(buf, leaf_table[i]);
00251 AV_WL64(&buf[8], leaf_table[i+1]);
00252 kset(s, buf, buf, 16);
00253 if (!rprobe(s, gdata, geob->datasize, oc->r_val) ||
00254 !nprobe(s, gdata, geob->datasize, oc->n_val))
00255 break;
00256 }
00257 if (i >= sizeof(leaf_table)) {
00258 av_log(s, AV_LOG_ERROR, "Invalid key\n");
00259 return -1;
00260 }
00261 }
00262
00263
00264 av_des_init(&oc->av_des, oc->m_val, 64, 0);
00265 av_des_crypt(&oc->av_des, oc->e_val, &gdata[OMA_ENC_HEADER_SIZE + 40], 1, NULL, 0);
00266 hex_log(s, AV_LOG_DEBUG, "EK", oc->e_val, 8);
00267
00268
00269 av_des_init(&oc->av_des, oc->e_val, 64, 1);
00270
00271 return 0;
00272 }
00273
00274 static int oma_read_header(AVFormatContext *s,
00275 AVFormatParameters *ap)
00276 {
00277 int ret, framesize, jsflag, samplerate;
00278 uint32_t codec_params;
00279 int16_t eid;
00280 uint8_t buf[EA3_HEADER_SIZE];
00281 uint8_t *edata;
00282 AVStream *st;
00283 ID3v2ExtraMeta *extra_meta = NULL;
00284 OMAContext *oc = s->priv_data;
00285
00286 ff_id3v2_read_all(s, ID3v2_EA3_MAGIC, &extra_meta);
00287 ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
00288 if (ret < EA3_HEADER_SIZE)
00289 return -1;
00290
00291 if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}),3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
00292 av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
00293 return -1;
00294 }
00295
00296 oc->content_start = avio_tell(s->pb);
00297
00298
00299 eid = AV_RB16(&buf[6]);
00300 if (eid != -1 && eid != -128 && decrypt_init(s, extra_meta, buf) < 0) {
00301 ff_id3v2_free_extra_meta(&extra_meta);
00302 return -1;
00303 }
00304
00305 ff_id3v2_free_extra_meta(&extra_meta);
00306
00307 codec_params = AV_RB24(&buf[33]);
00308
00309 st = avformat_new_stream(s, NULL);
00310 if (!st)
00311 return AVERROR(ENOMEM);
00312
00313 st->start_time = 0;
00314 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00315 st->codec->codec_tag = buf[32];
00316 st->codec->codec_id = ff_codec_get_id(ff_oma_codec_tags, st->codec->codec_tag);
00317
00318 switch (buf[32]) {
00319 case OMA_CODECID_ATRAC3:
00320 samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
00321 if (!samplerate) {
00322 av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
00323 return AVERROR_INVALIDDATA;
00324 }
00325 if (samplerate != 44100)
00326 av_log_ask_for_sample(s, "Unsupported sample rate: %d\n",
00327 samplerate);
00328
00329 framesize = (codec_params & 0x3FF) * 8;
00330 jsflag = (codec_params >> 17) & 1;
00331 st->codec->channels = 2;
00332 st->codec->sample_rate = samplerate;
00333 st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024;
00334
00335
00336 st->codec->extradata_size = 14;
00337 edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE);
00338 if (!edata)
00339 return AVERROR(ENOMEM);
00340
00341 st->codec->extradata = edata;
00342 AV_WL16(&edata[0], 1);
00343 AV_WL32(&edata[2], samplerate);
00344 AV_WL16(&edata[6], jsflag);
00345 AV_WL16(&edata[8], jsflag);
00346 AV_WL16(&edata[10], 1);
00347
00348
00349 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
00350 break;
00351 case OMA_CODECID_ATRAC3P:
00352 st->codec->channels = (codec_params >> 10) & 7;
00353 framesize = ((codec_params & 0x3FF) * 8) + 8;
00354 samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
00355 if (!samplerate) {
00356 av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
00357 return AVERROR_INVALIDDATA;
00358 }
00359 st->codec->sample_rate = samplerate;
00360 st->codec->bit_rate = samplerate * framesize * 8 / 1024;
00361 avpriv_set_pts_info(st, 64, 1, samplerate);
00362 av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n");
00363 break;
00364 case OMA_CODECID_MP3:
00365 st->need_parsing = AVSTREAM_PARSE_FULL;
00366 framesize = 1024;
00367 break;
00368 case OMA_CODECID_LPCM:
00369
00370 st->codec->channels = 2;
00371 st->codec->sample_rate = 44100;
00372 framesize = 1024;
00373
00374 st->codec->bit_rate = st->codec->sample_rate * 32;
00375 st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
00376 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
00377 break;
00378 default:
00379 av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]);
00380 return -1;
00381 }
00382
00383 st->codec->block_align = framesize;
00384
00385 return 0;
00386 }
00387
00388
00389 static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
00390 {
00391 OMAContext *oc = s->priv_data;
00392 int packet_size = s->streams[0]->codec->block_align;
00393 int ret = av_get_packet(s->pb, pkt, packet_size);
00394
00395 if (ret < packet_size)
00396 pkt->flags |= AV_PKT_FLAG_CORRUPT;
00397
00398 if (ret <= 0)
00399 return AVERROR(EIO);
00400
00401 pkt->stream_index = 0;
00402
00403 if (oc->encrypted) {
00404
00405
00406 if (ret == packet_size)
00407 av_des_crypt(&oc->av_des, pkt->data, pkt->data,
00408 (packet_size >> 3), oc->iv, 1);
00409 else
00410 memset(oc->iv, 0, 8);
00411 }
00412
00413 return ret;
00414 }
00415
00416 static int oma_read_probe(AVProbeData *p)
00417 {
00418 const uint8_t *buf;
00419 unsigned tag_len = 0;
00420
00421 buf = p->buf;
00422
00423 if (p->buf_size < ID3v2_HEADER_SIZE ||
00424 !ff_id3v2_match(buf, ID3v2_EA3_MAGIC) ||
00425 buf[3] != 3 ||
00426 buf[4])
00427 return 0;
00428
00429 tag_len = ff_id3v2_tag_len(buf);
00430
00431
00432 if (p->buf_size < tag_len + 5)
00433
00434 return AVPROBE_SCORE_MAX / 2;
00435
00436 buf += tag_len;
00437
00438 if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE)
00439 return AVPROBE_SCORE_MAX;
00440 else
00441 return 0;
00442 }
00443
00444 static int oma_read_seek(struct AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
00445 {
00446 OMAContext *oc = s->priv_data;
00447
00448 int err = pcm_read_seek(s, stream_index, timestamp, flags);
00449
00450 if (!oc->encrypted)
00451 return err;
00452
00453
00454 if (err || avio_tell(s->pb) < oc->content_start)
00455 goto wipe;
00456 if ((err = avio_seek(s->pb, -8, SEEK_CUR)) < 0)
00457 goto wipe;
00458 if ((err = avio_read(s->pb, oc->iv, 8)) < 8) {
00459 if (err >= 0)
00460 err = AVERROR_EOF;
00461 goto wipe;
00462 }
00463
00464 return 0;
00465 wipe:
00466 memset(oc->iv, 0, 8);
00467 return err;
00468 }
00469
00470 AVInputFormat ff_oma_demuxer = {
00471 .name = "oma",
00472 .long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
00473 .priv_data_size = sizeof(OMAContext),
00474 .read_probe = oma_read_probe,
00475 .read_header = oma_read_header,
00476 .read_packet = oma_read_packet,
00477 .read_seek = oma_read_seek,
00478 .flags = AVFMT_GENERIC_INDEX,
00479 .extensions = "oma,omg,aa3",
00480 .codec_tag = (const AVCodecTag* const []){ff_oma_codec_tags, 0},
00481 };
00482