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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 static int rprobe(AVFormatContext *s, uint8_t *enc_header, const uint8_t *r_val)
00117 {
00118 OMAContext *oc = s->priv_data;
00119 unsigned int pos;
00120 struct AVDES av_des;
00121
00122 if (!enc_header || !r_val)
00123 return -1;
00124
00125
00126 av_des_init(&av_des, r_val, 192, 1);
00127 av_des_crypt(&av_des, oc->m_val, &enc_header[48], 1, NULL, 1);
00128
00129
00130 av_des_init(&av_des, oc->m_val, 64, 0);
00131 av_des_crypt(&av_des, oc->s_val, NULL, 1, NULL, 0);
00132
00133
00134 pos = OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size;
00135 av_des_init(&av_des, oc->s_val, 64, 0);
00136 av_des_mac(&av_des, oc->sm_val, &enc_header[pos], (oc->i_size >> 3));
00137
00138 pos += oc->i_size;
00139
00140 return memcmp(&enc_header[pos], oc->sm_val, 8) ? -1 : 0;
00141 }
00142
00143 static int nprobe(AVFormatContext *s, uint8_t *enc_header, const uint8_t *n_val)
00144 {
00145 OMAContext *oc = s->priv_data;
00146 uint32_t pos, taglen, datalen;
00147 struct AVDES av_des;
00148
00149 if (!enc_header || !n_val)
00150 return -1;
00151
00152 pos = OMA_ENC_HEADER_SIZE + oc->k_size;
00153 if (!memcmp(&enc_header[pos], "EKB ", 4))
00154 pos += 32;
00155
00156 if (AV_RB32(&enc_header[pos]) != oc->rid)
00157 av_log(s, AV_LOG_DEBUG, "Mismatching RID\n");
00158
00159 taglen = AV_RB32(&enc_header[pos+32]);
00160 datalen = AV_RB32(&enc_header[pos+36]) >> 4;
00161
00162 pos += 44 + taglen;
00163
00164 av_des_init(&av_des, n_val, 192, 1);
00165 while (datalen-- > 0) {
00166 av_des_crypt(&av_des, oc->r_val, &enc_header[pos], 2, NULL, 1);
00167 kset(s, oc->r_val, NULL, 16);
00168 if (!rprobe(s, enc_header, oc->r_val))
00169 return 0;
00170 pos += 16;
00171 }
00172
00173 return -1;
00174 }
00175
00176 static int decrypt_init(AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
00177 {
00178 OMAContext *oc = s->priv_data;
00179 ID3v2ExtraMetaGEOB *geob = NULL;
00180 uint8_t *gdata;
00181
00182 oc->encrypted = 1;
00183 av_log(s, AV_LOG_INFO, "File is encrypted\n");
00184
00185
00186 while (em) {
00187 if (!strcmp(em->tag, "GEOB") &&
00188 (geob = em->data) &&
00189 (!strcmp(geob->description, "OMG_LSI") ||
00190 !strcmp(geob->description, "OMG_BKLSI"))) {
00191 break;
00192 }
00193 em = em->next;
00194 }
00195 if (!em) {
00196 av_log(s, AV_LOG_ERROR, "No encryption header found\n");
00197 return -1;
00198 }
00199
00200 if (geob->datasize < 64) {
00201 av_log(s, AV_LOG_ERROR, "Invalid GEOB data size: %u\n", geob->datasize);
00202 return -1;
00203 }
00204
00205 gdata = geob->data;
00206
00207 if (AV_RB16(gdata) != 1)
00208 av_log(s, AV_LOG_WARNING, "Unknown version in encryption header\n");
00209
00210 oc->k_size = AV_RB16(&gdata[2]);
00211 oc->e_size = AV_RB16(&gdata[4]);
00212 oc->i_size = AV_RB16(&gdata[6]);
00213 oc->s_size = AV_RB16(&gdata[8]);
00214
00215 if (memcmp(&gdata[OMA_ENC_HEADER_SIZE], "KEYRING ", 12)) {
00216 av_log(s, AV_LOG_ERROR, "Invalid encryption header\n");
00217 return -1;
00218 }
00219 oc->rid = AV_RB32(&gdata[OMA_ENC_HEADER_SIZE + 28]);
00220 av_log(s, AV_LOG_DEBUG, "RID: %.8x\n", oc->rid);
00221
00222 memcpy(oc->iv, &header[0x58], 8);
00223 hex_log(s, AV_LOG_DEBUG, "IV", oc->iv, 8);
00224
00225 hex_log(s, AV_LOG_DEBUG, "CBC-MAC", &gdata[OMA_ENC_HEADER_SIZE+oc->k_size+oc->e_size+oc->i_size], 8);
00226
00227 if (s->keylen > 0) {
00228 kset(s, s->key, s->key, s->keylen);
00229 }
00230 if (!memcmp(oc->r_val, (const uint8_t[8]){0}, 8) ||
00231 rprobe(s, gdata, oc->r_val) < 0 &&
00232 nprobe(s, gdata, oc->n_val) < 0) {
00233 int i;
00234 for (i = 0; i < FF_ARRAY_ELEMS(leaf_table); i += 2) {
00235 uint8_t buf[16];
00236 AV_WL64(buf, leaf_table[i]);
00237 AV_WL64(&buf[8], leaf_table[i+1]);
00238 kset(s, buf, buf, 16);
00239 if (!rprobe(s, gdata, oc->r_val) || !nprobe(s, gdata, oc->n_val))
00240 break;
00241 }
00242 if (i >= sizeof(leaf_table)) {
00243 av_log(s, AV_LOG_ERROR, "Invalid key\n");
00244 return -1;
00245 }
00246 }
00247
00248
00249 av_des_init(&oc->av_des, oc->m_val, 64, 0);
00250 av_des_crypt(&oc->av_des, oc->e_val, &gdata[OMA_ENC_HEADER_SIZE + 40], 1, NULL, 0);
00251 hex_log(s, AV_LOG_DEBUG, "EK", oc->e_val, 8);
00252
00253
00254 av_des_init(&oc->av_des, oc->e_val, 64, 1);
00255
00256 return 0;
00257 }
00258
00259 static int oma_read_header(AVFormatContext *s,
00260 AVFormatParameters *ap)
00261 {
00262 int ret, framesize, jsflag, samplerate;
00263 uint32_t codec_params;
00264 int16_t eid;
00265 uint8_t buf[EA3_HEADER_SIZE];
00266 uint8_t *edata;
00267 AVStream *st;
00268 ID3v2ExtraMeta *extra_meta = NULL;
00269 OMAContext *oc = s->priv_data;
00270
00271 ff_id3v2_read_all(s, ID3v2_EA3_MAGIC, &extra_meta);
00272 ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
00273 if (ret < EA3_HEADER_SIZE)
00274 return -1;
00275
00276 if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}),3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
00277 av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
00278 return -1;
00279 }
00280
00281 oc->content_start = avio_tell(s->pb);
00282
00283
00284 eid = AV_RB16(&buf[6]);
00285 if (eid != -1 && eid != -128 && decrypt_init(s, extra_meta, buf) < 0) {
00286 ff_id3v2_free_extra_meta(&extra_meta);
00287 return -1;
00288 }
00289
00290 ff_id3v2_free_extra_meta(&extra_meta);
00291
00292 codec_params = AV_RB24(&buf[33]);
00293
00294 st = avformat_new_stream(s, NULL);
00295 if (!st)
00296 return AVERROR(ENOMEM);
00297
00298 st->start_time = 0;
00299 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00300 st->codec->codec_tag = buf[32];
00301 st->codec->codec_id = ff_codec_get_id(ff_oma_codec_tags, st->codec->codec_tag);
00302
00303 switch (buf[32]) {
00304 case OMA_CODECID_ATRAC3:
00305 samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7]*100;
00306 if (samplerate != 44100)
00307 av_log_ask_for_sample(s, "Unsupported sample rate: %d\n",
00308 samplerate);
00309
00310 framesize = (codec_params & 0x3FF) * 8;
00311 jsflag = (codec_params >> 17) & 1;
00312 st->codec->channels = 2;
00313 st->codec->sample_rate = samplerate;
00314 st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024;
00315
00316
00317 st->codec->extradata_size = 14;
00318 edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE);
00319 if (!edata)
00320 return AVERROR(ENOMEM);
00321
00322 st->codec->extradata = edata;
00323 AV_WL16(&edata[0], 1);
00324 AV_WL32(&edata[2], samplerate);
00325 AV_WL16(&edata[6], jsflag);
00326 AV_WL16(&edata[8], jsflag);
00327 AV_WL16(&edata[10], 1);
00328
00329
00330 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
00331 break;
00332 case OMA_CODECID_ATRAC3P:
00333 st->codec->channels = (codec_params >> 10) & 7;
00334 framesize = ((codec_params & 0x3FF) * 8) + 8;
00335 st->codec->sample_rate = ff_oma_srate_tab[(codec_params >> 13) & 7]*100;
00336 st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024;
00337 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
00338 av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n");
00339 break;
00340 case OMA_CODECID_MP3:
00341 st->need_parsing = AVSTREAM_PARSE_FULL;
00342 framesize = 1024;
00343 break;
00344 case OMA_CODECID_LPCM:
00345
00346 st->codec->channels = 2;
00347 st->codec->sample_rate = 44100;
00348 framesize = 1024;
00349
00350 st->codec->bit_rate = st->codec->sample_rate * 32;
00351 st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
00352 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
00353 break;
00354 default:
00355 av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]);
00356 return -1;
00357 }
00358
00359 st->codec->block_align = framesize;
00360
00361 return 0;
00362 }
00363
00364
00365 static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
00366 {
00367 OMAContext *oc = s->priv_data;
00368 int packet_size = s->streams[0]->codec->block_align;
00369 int ret = av_get_packet(s->pb, pkt, packet_size);
00370
00371 if (ret <= 0)
00372 return AVERROR(EIO);
00373
00374 pkt->stream_index = 0;
00375
00376 if (oc->encrypted) {
00377
00378 av_des_crypt(&oc->av_des, pkt->data, pkt->data, (packet_size >> 3), oc->iv, 1);
00379 }
00380
00381 return ret;
00382 }
00383
00384 static int oma_read_probe(AVProbeData *p)
00385 {
00386 const uint8_t *buf;
00387 unsigned tag_len = 0;
00388
00389 buf = p->buf;
00390
00391 if (p->buf_size < ID3v2_HEADER_SIZE ||
00392 !ff_id3v2_match(buf, ID3v2_EA3_MAGIC) ||
00393 buf[3] != 3 ||
00394 buf[4])
00395 return 0;
00396
00397 tag_len = ff_id3v2_tag_len(buf);
00398
00399
00400 if (p->buf_size < tag_len + 5)
00401
00402 return AVPROBE_SCORE_MAX / 2;
00403
00404 buf += tag_len;
00405
00406 if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE)
00407 return AVPROBE_SCORE_MAX;
00408 else
00409 return 0;
00410 }
00411
00412 static int oma_read_seek(struct AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
00413 {
00414 OMAContext *oc = s->priv_data;
00415
00416 pcm_read_seek(s, stream_index, timestamp, flags);
00417
00418 if (oc->encrypted) {
00419
00420 int64_t pos = avio_tell(s->pb);
00421 if (pos < oc->content_start)
00422 memset(oc->iv, 0, 8);
00423 else {
00424 if (avio_seek(s->pb, -8, SEEK_CUR) < 0 || avio_read(s->pb, oc->iv, 8) < 8) {
00425 memset(oc->iv, 0, 8);
00426 return -1;
00427 }
00428 }
00429 }
00430
00431 return 0;
00432 }
00433
00434 AVInputFormat ff_oma_demuxer = {
00435 .name = "oma",
00436 .long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
00437 .priv_data_size = sizeof(OMAContext),
00438 .read_probe = oma_read_probe,
00439 .read_header = oma_read_header,
00440 .read_packet = oma_read_packet,
00441 .read_seek = oma_read_seek,
00442 .flags = AVFMT_GENERIC_INDEX,
00443 .extensions = "oma,omg,aa3",
00444 .codec_tag = (const AVCodecTag* const []){ff_oma_codec_tags, 0},
00445 };
00446