Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | //#define LOG_NDEBUG 0 |
| 18 | #define LOG_TAG "ID3" |
| 19 | #include <utils/Log.h> |
| 20 | |
| 21 | #include "../include/ID3.h" |
| 22 | |
| 23 | #include <media/stagefright/DataSource.h> |
| 24 | #include <media/stagefright/MediaDebug.h> |
| 25 | #include <media/stagefright/Utils.h> |
| 26 | #include <utils/String8.h> |
Marco Nelissen | e56b7e6c | 2010-02-09 07:40:10 -0800 | [diff] [blame] | 27 | #include <byteswap.h> |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 28 | |
| 29 | namespace android { |
| 30 | |
Andreas Huber | c2eeb2f | 2010-03-29 15:13:40 -0700 | [diff] [blame] | 31 | static const size_t kMaxMetadataSize = 3 * 1024 * 1024; |
| 32 | |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 33 | ID3::ID3(const sp<DataSource> &source) |
| 34 | : mIsValid(false), |
| 35 | mData(NULL), |
| 36 | mSize(0), |
| 37 | mFirstFrameOffset(0), |
| 38 | mVersion(ID3_UNKNOWN) { |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 39 | mIsValid = parseV2(source); |
| 40 | |
| 41 | if (!mIsValid) { |
| 42 | mIsValid = parseV1(source); |
| 43 | } |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | ID3::~ID3() { |
| 47 | if (mData) { |
| 48 | free(mData); |
| 49 | mData = NULL; |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | bool ID3::isValid() const { |
| 54 | return mIsValid; |
| 55 | } |
| 56 | |
| 57 | ID3::Version ID3::version() const { |
| 58 | return mVersion; |
| 59 | } |
| 60 | |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 61 | // static |
| 62 | bool ID3::ParseSyncsafeInteger(const uint8_t encoded[4], size_t *x) { |
| 63 | *x = 0; |
| 64 | for (int32_t i = 0; i < 4; ++i) { |
| 65 | if (encoded[i] & 0x80) { |
| 66 | return false; |
| 67 | } |
| 68 | |
| 69 | *x = ((*x) << 7) | encoded[i]; |
| 70 | } |
| 71 | |
| 72 | return true; |
| 73 | } |
| 74 | |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 75 | bool ID3::parseV2(const sp<DataSource> &source) { |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 76 | struct id3_header { |
| 77 | char id[3]; |
| 78 | uint8_t version_major; |
| 79 | uint8_t version_minor; |
| 80 | uint8_t flags; |
| 81 | uint8_t enc_size[4]; |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 82 | }; |
| 83 | |
| 84 | id3_header header; |
| 85 | if (source->readAt( |
| 86 | 0, &header, sizeof(header)) != (ssize_t)sizeof(header)) { |
| 87 | return false; |
| 88 | } |
| 89 | |
| 90 | if (memcmp(header.id, "ID3", 3)) { |
| 91 | return false; |
| 92 | } |
| 93 | |
| 94 | if (header.version_major == 0xff || header.version_minor == 0xff) { |
| 95 | return false; |
| 96 | } |
| 97 | |
| 98 | if (header.version_major == 2) { |
| 99 | if (header.flags & 0x3f) { |
| 100 | // We only support the 2 high bits, if any of the lower bits are |
| 101 | // set, we cannot guarantee to understand the tag format. |
| 102 | return false; |
| 103 | } |
| 104 | |
| 105 | if (header.flags & 0x40) { |
| 106 | // No compression scheme has been decided yet, ignore the |
| 107 | // tag if compression is indicated. |
| 108 | |
| 109 | return false; |
| 110 | } |
| 111 | } else if (header.version_major == 3) { |
| 112 | if (header.flags & 0x1f) { |
| 113 | // We only support the 3 high bits, if any of the lower bits are |
| 114 | // set, we cannot guarantee to understand the tag format. |
| 115 | return false; |
| 116 | } |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 117 | } else if (header.version_major == 4) { |
| 118 | if (header.flags & 0x0f) { |
| 119 | // The lower 4 bits are undefined in this spec. |
| 120 | return false; |
| 121 | } |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 122 | } else { |
| 123 | return false; |
| 124 | } |
| 125 | |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 126 | size_t size; |
| 127 | if (!ParseSyncsafeInteger(header.enc_size, &size)) { |
| 128 | return false; |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 129 | } |
| 130 | |
Andreas Huber | c2eeb2f | 2010-03-29 15:13:40 -0700 | [diff] [blame] | 131 | if (size > kMaxMetadataSize) { |
| 132 | LOGE("skipping huge ID3 metadata of size %d", size); |
| 133 | return false; |
| 134 | } |
| 135 | |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 136 | mData = (uint8_t *)malloc(size); |
| 137 | |
| 138 | if (mData == NULL) { |
| 139 | return false; |
| 140 | } |
| 141 | |
| 142 | mSize = size; |
| 143 | |
| 144 | if (source->readAt(sizeof(header), mData, mSize) != (ssize_t)mSize) { |
Andreas Huber | 8735f89 | 2010-08-25 14:55:53 -0700 | [diff] [blame] | 145 | free(mData); |
| 146 | mData = NULL; |
| 147 | |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 148 | return false; |
| 149 | } |
| 150 | |
Andreas Huber | 8735f89 | 2010-08-25 14:55:53 -0700 | [diff] [blame] | 151 | if (header.version_major == 4) { |
Andreas Huber | 5d266dd | 2010-12-14 09:49:29 -0800 | [diff] [blame] | 152 | void *copy = malloc(size); |
| 153 | memcpy(copy, mData, size); |
| 154 | |
| 155 | bool success = removeUnsynchronizationV2_4(false /* iTunesHack */); |
| 156 | if (!success) { |
| 157 | memcpy(mData, copy, size); |
| 158 | mSize = size; |
| 159 | |
| 160 | success = removeUnsynchronizationV2_4(true /* iTunesHack */); |
| 161 | |
| 162 | if (success) { |
| 163 | LOGV("Had to apply the iTunes hack to parse this ID3 tag"); |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | free(copy); |
| 168 | copy = NULL; |
| 169 | |
| 170 | if (!success) { |
Andreas Huber | 8735f89 | 2010-08-25 14:55:53 -0700 | [diff] [blame] | 171 | free(mData); |
| 172 | mData = NULL; |
| 173 | |
| 174 | return false; |
| 175 | } |
| 176 | } else if (header.flags & 0x80) { |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 177 | LOGV("removing unsynchronization"); |
Andreas Huber | 8735f89 | 2010-08-25 14:55:53 -0700 | [diff] [blame] | 178 | |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 179 | removeUnsynchronization(); |
| 180 | } |
| 181 | |
| 182 | mFirstFrameOffset = 0; |
| 183 | if (header.version_major == 3 && (header.flags & 0x40)) { |
| 184 | // Version 2.3 has an optional extended header. |
| 185 | |
| 186 | if (mSize < 4) { |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 187 | free(mData); |
| 188 | mData = NULL; |
| 189 | |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 190 | return false; |
| 191 | } |
| 192 | |
| 193 | size_t extendedHeaderSize = U32_AT(&mData[0]) + 4; |
| 194 | |
| 195 | if (extendedHeaderSize > mSize) { |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 196 | free(mData); |
| 197 | mData = NULL; |
| 198 | |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 199 | return false; |
| 200 | } |
| 201 | |
| 202 | mFirstFrameOffset = extendedHeaderSize; |
| 203 | |
| 204 | uint16_t extendedFlags = 0; |
| 205 | if (extendedHeaderSize >= 6) { |
| 206 | extendedFlags = U16_AT(&mData[4]); |
| 207 | |
| 208 | if (extendedHeaderSize >= 10) { |
| 209 | size_t paddingSize = U32_AT(&mData[6]); |
| 210 | |
| 211 | if (mFirstFrameOffset + paddingSize > mSize) { |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 212 | free(mData); |
| 213 | mData = NULL; |
| 214 | |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 215 | return false; |
| 216 | } |
| 217 | |
| 218 | mSize -= paddingSize; |
| 219 | } |
| 220 | |
| 221 | if (extendedFlags & 0x8000) { |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 222 | LOGV("have crc"); |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 223 | } |
| 224 | } |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 225 | } else if (header.version_major == 4 && (header.flags & 0x40)) { |
| 226 | // Version 2.4 has an optional extended header, that's different |
| 227 | // from Version 2.3's... |
| 228 | |
| 229 | if (mSize < 4) { |
| 230 | free(mData); |
| 231 | mData = NULL; |
| 232 | |
| 233 | return false; |
| 234 | } |
| 235 | |
| 236 | size_t ext_size; |
| 237 | if (!ParseSyncsafeInteger(mData, &ext_size)) { |
| 238 | free(mData); |
| 239 | mData = NULL; |
| 240 | |
| 241 | return false; |
| 242 | } |
| 243 | |
| 244 | if (ext_size < 6 || ext_size > mSize) { |
| 245 | free(mData); |
| 246 | mData = NULL; |
| 247 | |
| 248 | return false; |
| 249 | } |
| 250 | |
| 251 | mFirstFrameOffset = ext_size; |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | if (header.version_major == 2) { |
| 255 | mVersion = ID3_V2_2; |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 256 | } else if (header.version_major == 3) { |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 257 | mVersion = ID3_V2_3; |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 258 | } else { |
| 259 | CHECK_EQ(header.version_major, 4); |
| 260 | mVersion = ID3_V2_4; |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | return true; |
| 264 | } |
| 265 | |
| 266 | void ID3::removeUnsynchronization() { |
| 267 | for (size_t i = 0; i + 1 < mSize; ++i) { |
| 268 | if (mData[i] == 0xff && mData[i + 1] == 0x00) { |
| 269 | memmove(&mData[i + 1], &mData[i + 2], mSize - i - 2); |
| 270 | --mSize; |
| 271 | } |
| 272 | } |
| 273 | } |
| 274 | |
Andreas Huber | 8735f89 | 2010-08-25 14:55:53 -0700 | [diff] [blame] | 275 | static void WriteSyncsafeInteger(uint8_t *dst, size_t x) { |
| 276 | for (size_t i = 0; i < 4; ++i) { |
| 277 | dst[3 - i] = (x & 0x7f); |
| 278 | x >>= 7; |
| 279 | } |
| 280 | } |
| 281 | |
Andreas Huber | 5d266dd | 2010-12-14 09:49:29 -0800 | [diff] [blame] | 282 | bool ID3::removeUnsynchronizationV2_4(bool iTunesHack) { |
Andreas Huber | 8735f89 | 2010-08-25 14:55:53 -0700 | [diff] [blame] | 283 | size_t oldSize = mSize; |
| 284 | |
| 285 | size_t offset = 0; |
| 286 | while (offset + 10 <= mSize) { |
| 287 | if (!memcmp(&mData[offset], "\0\0\0\0", 4)) { |
| 288 | break; |
| 289 | } |
| 290 | |
| 291 | size_t dataSize; |
Andreas Huber | 5d266dd | 2010-12-14 09:49:29 -0800 | [diff] [blame] | 292 | if (iTunesHack) { |
| 293 | dataSize = U32_AT(&mData[offset + 4]); |
| 294 | } else if (!ParseSyncsafeInteger(&mData[offset + 4], &dataSize)) { |
Andreas Huber | 8735f89 | 2010-08-25 14:55:53 -0700 | [diff] [blame] | 295 | return false; |
| 296 | } |
| 297 | |
| 298 | if (offset + dataSize + 10 > mSize) { |
| 299 | return false; |
| 300 | } |
| 301 | |
| 302 | uint16_t flags = U16_AT(&mData[offset + 8]); |
| 303 | uint16_t prevFlags = flags; |
| 304 | |
| 305 | if (flags & 1) { |
| 306 | // Strip data length indicator |
| 307 | |
| 308 | memmove(&mData[offset + 10], &mData[offset + 14], mSize - offset - 14); |
| 309 | mSize -= 4; |
| 310 | dataSize -= 4; |
| 311 | |
| 312 | flags &= ~1; |
| 313 | } |
| 314 | |
| 315 | if (flags & 2) { |
| 316 | // Unsynchronization added. |
| 317 | |
| 318 | for (size_t i = 0; i + 1 < dataSize; ++i) { |
| 319 | if (mData[offset + 10 + i] == 0xff |
| 320 | && mData[offset + 11 + i] == 0x00) { |
| 321 | memmove(&mData[offset + 11 + i], &mData[offset + 12 + i], |
| 322 | mSize - offset - 12 - i); |
| 323 | --mSize; |
| 324 | --dataSize; |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | flags &= ~2; |
| 329 | } |
| 330 | |
Andreas Huber | 5d266dd | 2010-12-14 09:49:29 -0800 | [diff] [blame] | 331 | if (flags != prevFlags || iTunesHack) { |
Andreas Huber | 8735f89 | 2010-08-25 14:55:53 -0700 | [diff] [blame] | 332 | WriteSyncsafeInteger(&mData[offset + 4], dataSize); |
| 333 | mData[offset + 8] = flags >> 8; |
| 334 | mData[offset + 9] = flags & 0xff; |
| 335 | } |
| 336 | |
| 337 | offset += 10 + dataSize; |
| 338 | } |
| 339 | |
| 340 | memset(&mData[mSize], 0, oldSize - mSize); |
| 341 | |
| 342 | return true; |
| 343 | } |
| 344 | |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 345 | ID3::Iterator::Iterator(const ID3 &parent, const char *id) |
| 346 | : mParent(parent), |
| 347 | mID(NULL), |
| 348 | mOffset(mParent.mFirstFrameOffset), |
| 349 | mFrameData(NULL), |
| 350 | mFrameSize(0) { |
| 351 | if (id) { |
| 352 | mID = strdup(id); |
| 353 | } |
| 354 | |
| 355 | findFrame(); |
| 356 | } |
| 357 | |
| 358 | ID3::Iterator::~Iterator() { |
| 359 | if (mID) { |
| 360 | free(mID); |
| 361 | mID = NULL; |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | bool ID3::Iterator::done() const { |
| 366 | return mFrameData == NULL; |
| 367 | } |
| 368 | |
| 369 | void ID3::Iterator::next() { |
| 370 | if (mFrameData == NULL) { |
| 371 | return; |
| 372 | } |
| 373 | |
| 374 | mOffset += mFrameSize; |
| 375 | |
| 376 | findFrame(); |
| 377 | } |
| 378 | |
| 379 | void ID3::Iterator::getID(String8 *id) const { |
| 380 | id->setTo(""); |
| 381 | |
| 382 | if (mFrameData == NULL) { |
| 383 | return; |
| 384 | } |
| 385 | |
| 386 | if (mParent.mVersion == ID3_V2_2) { |
| 387 | id->setTo((const char *)&mParent.mData[mOffset], 3); |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 388 | } else if (mParent.mVersion == ID3_V2_3 || mParent.mVersion == ID3_V2_4) { |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 389 | id->setTo((const char *)&mParent.mData[mOffset], 4); |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 390 | } else { |
| 391 | CHECK(mParent.mVersion == ID3_V1 || mParent.mVersion == ID3_V1_1); |
| 392 | |
| 393 | switch (mOffset) { |
| 394 | case 3: |
| 395 | id->setTo("TT2"); |
| 396 | break; |
| 397 | case 33: |
| 398 | id->setTo("TP1"); |
| 399 | break; |
| 400 | case 63: |
| 401 | id->setTo("TAL"); |
| 402 | break; |
| 403 | case 93: |
| 404 | id->setTo("TYE"); |
| 405 | break; |
| 406 | case 97: |
| 407 | id->setTo("COM"); |
| 408 | break; |
| 409 | case 126: |
| 410 | id->setTo("TRK"); |
| 411 | break; |
| 412 | case 127: |
| 413 | id->setTo("TCO"); |
| 414 | break; |
| 415 | default: |
| 416 | CHECK(!"should not be here."); |
| 417 | break; |
| 418 | } |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 419 | } |
| 420 | } |
| 421 | |
| 422 | static void convertISO8859ToString8( |
| 423 | const uint8_t *data, size_t size, |
| 424 | String8 *s) { |
| 425 | size_t utf8len = 0; |
| 426 | for (size_t i = 0; i < size; ++i) { |
Andreas Huber | 9be54d4 | 2010-02-08 11:04:56 -0800 | [diff] [blame] | 427 | if (data[i] == '\0') { |
Kenny Root | 0c2ab24 | 2010-03-15 22:45:02 -0700 | [diff] [blame] | 428 | size = i; |
Andreas Huber | 9be54d4 | 2010-02-08 11:04:56 -0800 | [diff] [blame] | 429 | break; |
| 430 | } else if (data[i] < 0x80) { |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 431 | ++utf8len; |
| 432 | } else { |
| 433 | utf8len += 2; |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | if (utf8len == size) { |
| 438 | // Only ASCII characters present. |
| 439 | |
| 440 | s->setTo((const char *)data, size); |
| 441 | return; |
| 442 | } |
| 443 | |
| 444 | char *tmp = new char[utf8len]; |
| 445 | char *ptr = tmp; |
| 446 | for (size_t i = 0; i < size; ++i) { |
Andreas Huber | 9be54d4 | 2010-02-08 11:04:56 -0800 | [diff] [blame] | 447 | if (data[i] == '\0') { |
| 448 | break; |
| 449 | } else if (data[i] < 0x80) { |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 450 | *ptr++ = data[i]; |
| 451 | } else if (data[i] < 0xc0) { |
| 452 | *ptr++ = 0xc2; |
| 453 | *ptr++ = data[i]; |
| 454 | } else { |
| 455 | *ptr++ = 0xc3; |
| 456 | *ptr++ = data[i] - 64; |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | s->setTo(tmp, utf8len); |
| 461 | |
| 462 | delete[] tmp; |
| 463 | tmp = NULL; |
| 464 | } |
| 465 | |
| 466 | void ID3::Iterator::getString(String8 *id) const { |
| 467 | id->setTo(""); |
| 468 | |
| 469 | if (mFrameData == NULL) { |
| 470 | return; |
| 471 | } |
| 472 | |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 473 | if (mParent.mVersion == ID3_V1 || mParent.mVersion == ID3_V1_1) { |
| 474 | if (mOffset == 126 || mOffset == 127) { |
| 475 | // Special treatment for the track number and genre. |
| 476 | char tmp[16]; |
| 477 | sprintf(tmp, "%d", (int)*mFrameData); |
| 478 | |
| 479 | id->setTo(tmp); |
| 480 | return; |
| 481 | } |
| 482 | |
Andreas Huber | 9be54d4 | 2010-02-08 11:04:56 -0800 | [diff] [blame] | 483 | convertISO8859ToString8(mFrameData, mFrameSize, id); |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 484 | return; |
| 485 | } |
| 486 | |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 487 | size_t n = mFrameSize - getHeaderLength() - 1; |
| 488 | |
| 489 | if (*mFrameData == 0x00) { |
| 490 | // ISO 8859-1 |
| 491 | convertISO8859ToString8(mFrameData + 1, n, id); |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 492 | } else if (*mFrameData == 0x03) { |
| 493 | // UTF-8 |
| 494 | id->setTo((const char *)(mFrameData + 1), n); |
| 495 | } else if (*mFrameData == 0x02) { |
| 496 | // UTF-16 BE, no byte order mark. |
| 497 | // API wants number of characters, not number of bytes... |
| 498 | int len = n / 2; |
| 499 | const char16_t *framedata = (const char16_t *) (mFrameData + 1); |
| 500 | char16_t *framedatacopy = NULL; |
| 501 | #if BYTE_ORDER == LITTLE_ENDIAN |
| 502 | framedatacopy = new char16_t[len]; |
| 503 | for (int i = 0; i < len; i++) { |
| 504 | framedatacopy[i] = bswap_16(framedata[i]); |
| 505 | } |
| 506 | framedata = framedatacopy; |
| 507 | #endif |
| 508 | id->setTo(framedata, len); |
| 509 | if (framedatacopy != NULL) { |
| 510 | delete[] framedatacopy; |
| 511 | } |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 512 | } else { |
| 513 | // UCS-2 |
Andreas Huber | 5b5ae13 | 2010-01-19 13:52:06 -0800 | [diff] [blame] | 514 | // API wants number of characters, not number of bytes... |
Marco Nelissen | 3887ac7 | 2010-02-08 15:04:23 -0800 | [diff] [blame] | 515 | int len = n / 2; |
| 516 | const char16_t *framedata = (const char16_t *) (mFrameData + 1); |
| 517 | char16_t *framedatacopy = NULL; |
| 518 | if (*framedata == 0xfffe) { |
| 519 | // endianness marker doesn't match host endianness, convert |
| 520 | framedatacopy = new char16_t[len]; |
| 521 | for (int i = 0; i < len; i++) { |
Marco Nelissen | e56b7e6c | 2010-02-09 07:40:10 -0800 | [diff] [blame] | 522 | framedatacopy[i] = bswap_16(framedata[i]); |
Marco Nelissen | 3887ac7 | 2010-02-08 15:04:23 -0800 | [diff] [blame] | 523 | } |
| 524 | framedata = framedatacopy; |
| 525 | } |
| 526 | // If the string starts with an endianness marker, skip it |
| 527 | if (*framedata == 0xfeff) { |
| 528 | framedata++; |
| 529 | len--; |
| 530 | } |
| 531 | id->setTo(framedata, len); |
| 532 | if (framedatacopy != NULL) { |
| 533 | delete[] framedatacopy; |
| 534 | } |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 535 | } |
| 536 | } |
| 537 | |
| 538 | const uint8_t *ID3::Iterator::getData(size_t *length) const { |
| 539 | *length = 0; |
| 540 | |
| 541 | if (mFrameData == NULL) { |
| 542 | return NULL; |
| 543 | } |
| 544 | |
| 545 | *length = mFrameSize - getHeaderLength(); |
| 546 | |
| 547 | return mFrameData; |
| 548 | } |
| 549 | |
| 550 | size_t ID3::Iterator::getHeaderLength() const { |
| 551 | if (mParent.mVersion == ID3_V2_2) { |
| 552 | return 6; |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 553 | } else if (mParent.mVersion == ID3_V2_3 || mParent.mVersion == ID3_V2_4) { |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 554 | return 10; |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 555 | } else { |
| 556 | CHECK(mParent.mVersion == ID3_V1 || mParent.mVersion == ID3_V1_1); |
| 557 | return 0; |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 558 | } |
| 559 | } |
| 560 | |
| 561 | void ID3::Iterator::findFrame() { |
| 562 | for (;;) { |
| 563 | mFrameData = NULL; |
| 564 | mFrameSize = 0; |
| 565 | |
| 566 | if (mParent.mVersion == ID3_V2_2) { |
| 567 | if (mOffset + 6 > mParent.mSize) { |
| 568 | return; |
| 569 | } |
| 570 | |
| 571 | if (!memcmp(&mParent.mData[mOffset], "\0\0\0", 3)) { |
| 572 | return; |
| 573 | } |
| 574 | |
| 575 | mFrameSize = |
| 576 | (mParent.mData[mOffset + 3] << 16) |
| 577 | | (mParent.mData[mOffset + 4] << 8) |
| 578 | | mParent.mData[mOffset + 5]; |
| 579 | |
| 580 | mFrameSize += 6; |
| 581 | |
| 582 | if (mOffset + mFrameSize > mParent.mSize) { |
| 583 | LOGV("partial frame at offset %d (size = %d, bytes-remaining = %d)", |
| 584 | mOffset, mFrameSize, mParent.mSize - mOffset - 6); |
| 585 | return; |
| 586 | } |
| 587 | |
| 588 | mFrameData = &mParent.mData[mOffset + 6]; |
| 589 | |
| 590 | if (!mID) { |
| 591 | break; |
| 592 | } |
| 593 | |
| 594 | char id[4]; |
| 595 | memcpy(id, &mParent.mData[mOffset], 3); |
| 596 | id[3] = '\0'; |
| 597 | |
| 598 | if (!strcmp(id, mID)) { |
| 599 | break; |
| 600 | } |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 601 | } else if (mParent.mVersion == ID3_V2_3 |
| 602 | || mParent.mVersion == ID3_V2_4) { |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 603 | if (mOffset + 10 > mParent.mSize) { |
| 604 | return; |
| 605 | } |
| 606 | |
| 607 | if (!memcmp(&mParent.mData[mOffset], "\0\0\0\0", 4)) { |
| 608 | return; |
| 609 | } |
| 610 | |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 611 | size_t baseSize; |
| 612 | if (mParent.mVersion == ID3_V2_4) { |
| 613 | if (!ParseSyncsafeInteger( |
| 614 | &mParent.mData[mOffset + 4], &baseSize)) { |
| 615 | return; |
| 616 | } |
| 617 | } else { |
| 618 | baseSize = U32_AT(&mParent.mData[mOffset + 4]); |
| 619 | } |
| 620 | |
| 621 | mFrameSize = 10 + baseSize; |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 622 | |
| 623 | if (mOffset + mFrameSize > mParent.mSize) { |
| 624 | LOGV("partial frame at offset %d (size = %d, bytes-remaining = %d)", |
| 625 | mOffset, mFrameSize, mParent.mSize - mOffset - 10); |
| 626 | return; |
| 627 | } |
| 628 | |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 629 | uint16_t flags = U16_AT(&mParent.mData[mOffset + 8]); |
| 630 | |
Andreas Huber | 8735f89 | 2010-08-25 14:55:53 -0700 | [diff] [blame] | 631 | if ((mParent.mVersion == ID3_V2_4 && (flags & 0x000c)) |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 632 | || (mParent.mVersion == ID3_V2_3 && (flags & 0x00c0))) { |
Andreas Huber | 8735f89 | 2010-08-25 14:55:53 -0700 | [diff] [blame] | 633 | // Compression or encryption are not supported at this time. |
| 634 | // Per-frame unsynchronization and data-length indicator |
| 635 | // have already been taken care of. |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 636 | |
| 637 | LOGV("Skipping unsupported frame (compression, encryption " |
| 638 | "or per-frame unsynchronization flagged"); |
| 639 | |
| 640 | mOffset += mFrameSize; |
| 641 | continue; |
| 642 | } |
| 643 | |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 644 | mFrameData = &mParent.mData[mOffset + 10]; |
| 645 | |
| 646 | if (!mID) { |
| 647 | break; |
| 648 | } |
| 649 | |
| 650 | char id[5]; |
| 651 | memcpy(id, &mParent.mData[mOffset], 4); |
| 652 | id[4] = '\0'; |
| 653 | |
| 654 | if (!strcmp(id, mID)) { |
| 655 | break; |
| 656 | } |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 657 | } else { |
| 658 | CHECK(mParent.mVersion == ID3_V1 || mParent.mVersion == ID3_V1_1); |
| 659 | |
| 660 | if (mOffset >= mParent.mSize) { |
| 661 | return; |
| 662 | } |
| 663 | |
| 664 | mFrameData = &mParent.mData[mOffset]; |
| 665 | |
| 666 | switch (mOffset) { |
| 667 | case 3: |
| 668 | case 33: |
| 669 | case 63: |
| 670 | mFrameSize = 30; |
| 671 | break; |
| 672 | case 93: |
| 673 | mFrameSize = 4; |
| 674 | break; |
| 675 | case 97: |
| 676 | if (mParent.mVersion == ID3_V1) { |
| 677 | mFrameSize = 30; |
| 678 | } else { |
| 679 | mFrameSize = 29; |
| 680 | } |
| 681 | break; |
| 682 | case 126: |
| 683 | mFrameSize = 1; |
| 684 | break; |
| 685 | case 127: |
| 686 | mFrameSize = 1; |
| 687 | break; |
| 688 | default: |
| 689 | CHECK(!"Should not be here, invalid offset."); |
| 690 | break; |
| 691 | } |
| 692 | |
| 693 | if (!mID) { |
| 694 | break; |
| 695 | } |
| 696 | |
| 697 | String8 id; |
| 698 | getID(&id); |
| 699 | |
| 700 | if (id == mID) { |
| 701 | break; |
| 702 | } |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 703 | } |
| 704 | |
| 705 | mOffset += mFrameSize; |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | static size_t StringSize(const uint8_t *start, uint8_t encoding) { |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 710 | if (encoding == 0x00 || encoding == 0x03) { |
| 711 | // ISO 8859-1 or UTF-8 |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 712 | return strlen((const char *)start) + 1; |
| 713 | } |
| 714 | |
| 715 | // UCS-2 |
| 716 | size_t n = 0; |
| 717 | while (start[n] != '\0' || start[n + 1] != '\0') { |
| 718 | n += 2; |
| 719 | } |
| 720 | |
| 721 | return n; |
| 722 | } |
| 723 | |
| 724 | const void * |
| 725 | ID3::getAlbumArt(size_t *length, String8 *mime) const { |
| 726 | *length = 0; |
| 727 | mime->setTo(""); |
| 728 | |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 729 | Iterator it( |
| 730 | *this, |
| 731 | (mVersion == ID3_V2_3 || mVersion == ID3_V2_4) ? "APIC" : "PIC"); |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 732 | |
| 733 | while (!it.done()) { |
| 734 | size_t size; |
| 735 | const uint8_t *data = it.getData(&size); |
| 736 | |
Andreas Huber | c944cbe | 2010-04-08 14:01:33 -0700 | [diff] [blame] | 737 | if (mVersion == ID3_V2_3 || mVersion == ID3_V2_4) { |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 738 | uint8_t encoding = data[0]; |
| 739 | mime->setTo((const char *)&data[1]); |
| 740 | size_t mimeLen = strlen((const char *)&data[1]) + 1; |
| 741 | |
| 742 | uint8_t picType = data[1 + mimeLen]; |
| 743 | #if 0 |
| 744 | if (picType != 0x03) { |
| 745 | // Front Cover Art |
| 746 | it.next(); |
| 747 | continue; |
| 748 | } |
| 749 | #endif |
| 750 | |
| 751 | size_t descLen = StringSize(&data[2 + mimeLen], encoding); |
| 752 | |
| 753 | *length = size - 2 - mimeLen - descLen; |
| 754 | |
| 755 | return &data[2 + mimeLen + descLen]; |
| 756 | } else { |
| 757 | uint8_t encoding = data[0]; |
| 758 | |
| 759 | if (!memcmp(&data[1], "PNG", 3)) { |
| 760 | mime->setTo("image/png"); |
| 761 | } else if (!memcmp(&data[1], "JPG", 3)) { |
| 762 | mime->setTo("image/jpeg"); |
| 763 | } else if (!memcmp(&data[1], "-->", 3)) { |
| 764 | mime->setTo("text/plain"); |
| 765 | } else { |
| 766 | return NULL; |
| 767 | } |
| 768 | |
| 769 | #if 0 |
| 770 | uint8_t picType = data[4]; |
| 771 | if (picType != 0x03) { |
| 772 | // Front Cover Art |
| 773 | it.next(); |
| 774 | continue; |
| 775 | } |
| 776 | #endif |
| 777 | |
| 778 | size_t descLen = StringSize(&data[5], encoding); |
| 779 | |
| 780 | *length = size - 5 - descLen; |
| 781 | |
| 782 | return &data[5 + descLen]; |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | return NULL; |
| 787 | } |
| 788 | |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 789 | bool ID3::parseV1(const sp<DataSource> &source) { |
| 790 | const size_t V1_TAG_SIZE = 128; |
| 791 | |
James Dong | b1262a8 | 2010-11-16 14:04:54 -0800 | [diff] [blame] | 792 | off64_t size; |
| 793 | if (source->getSize(&size) != OK || size < (off64_t)V1_TAG_SIZE) { |
Andreas Huber | 43782d3 | 2010-01-19 13:35:27 -0800 | [diff] [blame] | 794 | return false; |
| 795 | } |
| 796 | |
| 797 | mData = (uint8_t *)malloc(V1_TAG_SIZE); |
| 798 | if (source->readAt(size - V1_TAG_SIZE, mData, V1_TAG_SIZE) |
| 799 | != (ssize_t)V1_TAG_SIZE) { |
| 800 | free(mData); |
| 801 | mData = NULL; |
| 802 | |
| 803 | return false; |
| 804 | } |
| 805 | |
| 806 | if (memcmp("TAG", mData, 3)) { |
| 807 | free(mData); |
| 808 | mData = NULL; |
| 809 | |
| 810 | return false; |
| 811 | } |
| 812 | |
| 813 | mSize = V1_TAG_SIZE; |
| 814 | mFirstFrameOffset = 3; |
| 815 | |
| 816 | if (mData[V1_TAG_SIZE - 3] != 0) { |
| 817 | mVersion = ID3_V1; |
| 818 | } else { |
| 819 | mVersion = ID3_V1_1; |
| 820 | } |
| 821 | |
| 822 | return true; |
| 823 | } |
Andreas Huber | aee3c63 | 2010-01-11 15:35:19 -0800 | [diff] [blame] | 824 | |
| 825 | } // namespace android |