Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009 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 "WAVExtractor" |
| 19 | #include <utils/Log.h> |
| 20 | |
| 21 | #include "include/WAVExtractor.h" |
| 22 | |
| 23 | #include <media/stagefright/DataSource.h> |
| 24 | #include <media/stagefright/MediaBufferGroup.h> |
| 25 | #include <media/stagefright/MediaDebug.h> |
| 26 | #include <media/stagefright/MediaDefs.h> |
| 27 | #include <media/stagefright/MediaErrors.h> |
| 28 | #include <media/stagefright/MediaSource.h> |
| 29 | #include <media/stagefright/MetaData.h> |
| 30 | #include <utils/String8.h> |
| 31 | |
| 32 | namespace android { |
| 33 | |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 34 | enum { |
| 35 | WAVE_FORMAT_PCM = 1, |
| 36 | WAVE_FORMAT_ALAW = 6, |
| 37 | WAVE_FORMAT_MULAW = 7, |
| 38 | }; |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 39 | |
| 40 | static uint32_t U32_LE_AT(const uint8_t *ptr) { |
| 41 | return ptr[3] << 24 | ptr[2] << 16 | ptr[1] << 8 | ptr[0]; |
| 42 | } |
| 43 | |
| 44 | static uint16_t U16_LE_AT(const uint8_t *ptr) { |
| 45 | return ptr[1] << 8 | ptr[0]; |
| 46 | } |
| 47 | |
| 48 | struct WAVSource : public MediaSource { |
| 49 | WAVSource( |
| 50 | const sp<DataSource> &dataSource, |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 51 | const sp<MetaData> &meta, |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 52 | uint16_t waveFormat, |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 53 | int32_t bitsPerSample, |
James Dong | b1262a8 | 2010-11-16 14:04:54 -0800 | [diff] [blame] | 54 | off64_t offset, size_t size); |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 55 | |
| 56 | virtual status_t start(MetaData *params = NULL); |
| 57 | virtual status_t stop(); |
| 58 | virtual sp<MetaData> getFormat(); |
| 59 | |
| 60 | virtual status_t read( |
| 61 | MediaBuffer **buffer, const ReadOptions *options = NULL); |
| 62 | |
| 63 | protected: |
| 64 | virtual ~WAVSource(); |
| 65 | |
| 66 | private: |
| 67 | static const size_t kMaxFrameSize; |
| 68 | |
| 69 | sp<DataSource> mDataSource; |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 70 | sp<MetaData> mMeta; |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 71 | uint16_t mWaveFormat; |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 72 | int32_t mSampleRate; |
| 73 | int32_t mNumChannels; |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 74 | int32_t mBitsPerSample; |
James Dong | b1262a8 | 2010-11-16 14:04:54 -0800 | [diff] [blame] | 75 | off64_t mOffset; |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 76 | size_t mSize; |
| 77 | bool mStarted; |
| 78 | MediaBufferGroup *mGroup; |
James Dong | b1262a8 | 2010-11-16 14:04:54 -0800 | [diff] [blame] | 79 | off64_t mCurrentPos; |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 80 | |
| 81 | WAVSource(const WAVSource &); |
| 82 | WAVSource &operator=(const WAVSource &); |
| 83 | }; |
| 84 | |
| 85 | WAVExtractor::WAVExtractor(const sp<DataSource> &source) |
| 86 | : mDataSource(source), |
| 87 | mValidFormat(false) { |
| 88 | mInitCheck = init(); |
| 89 | } |
| 90 | |
| 91 | WAVExtractor::~WAVExtractor() { |
| 92 | } |
| 93 | |
Andreas Huber | 1cb02bf | 2010-01-13 11:25:10 -0800 | [diff] [blame] | 94 | sp<MetaData> WAVExtractor::getMetaData() { |
| 95 | sp<MetaData> meta = new MetaData; |
| 96 | |
| 97 | if (mInitCheck != OK) { |
| 98 | return meta; |
| 99 | } |
| 100 | |
| 101 | meta->setCString(kKeyMIMEType, "audio/x-wav"); |
| 102 | |
| 103 | return meta; |
| 104 | } |
| 105 | |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 106 | size_t WAVExtractor::countTracks() { |
| 107 | return mInitCheck == OK ? 1 : 0; |
| 108 | } |
| 109 | |
| 110 | sp<MediaSource> WAVExtractor::getTrack(size_t index) { |
| 111 | if (mInitCheck != OK || index > 0) { |
| 112 | return NULL; |
| 113 | } |
| 114 | |
| 115 | return new WAVSource( |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 116 | mDataSource, mTrackMeta, |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 117 | mWaveFormat, mBitsPerSample, mDataOffset, mDataSize); |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | sp<MetaData> WAVExtractor::getTrackMetaData( |
| 121 | size_t index, uint32_t flags) { |
| 122 | if (mInitCheck != OK || index > 0) { |
| 123 | return NULL; |
| 124 | } |
| 125 | |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 126 | return mTrackMeta; |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | status_t WAVExtractor::init() { |
| 130 | uint8_t header[12]; |
| 131 | if (mDataSource->readAt( |
| 132 | 0, header, sizeof(header)) < (ssize_t)sizeof(header)) { |
| 133 | return NO_INIT; |
| 134 | } |
| 135 | |
| 136 | if (memcmp(header, "RIFF", 4) || memcmp(&header[8], "WAVE", 4)) { |
| 137 | return NO_INIT; |
| 138 | } |
| 139 | |
| 140 | size_t totalSize = U32_LE_AT(&header[4]); |
| 141 | |
James Dong | b1262a8 | 2010-11-16 14:04:54 -0800 | [diff] [blame] | 142 | off64_t offset = 12; |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 143 | size_t remainingSize = totalSize; |
| 144 | while (remainingSize >= 8) { |
| 145 | uint8_t chunkHeader[8]; |
| 146 | if (mDataSource->readAt(offset, chunkHeader, 8) < 8) { |
| 147 | return NO_INIT; |
| 148 | } |
| 149 | |
| 150 | remainingSize -= 8; |
| 151 | offset += 8; |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 152 | |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 153 | uint32_t chunkSize = U32_LE_AT(&chunkHeader[4]); |
| 154 | |
| 155 | if (chunkSize > remainingSize) { |
| 156 | return NO_INIT; |
| 157 | } |
| 158 | |
| 159 | if (!memcmp(chunkHeader, "fmt ", 4)) { |
| 160 | if (chunkSize < 16) { |
| 161 | return NO_INIT; |
| 162 | } |
| 163 | |
| 164 | uint8_t formatSpec[16]; |
| 165 | if (mDataSource->readAt(offset, formatSpec, 16) < 16) { |
| 166 | return NO_INIT; |
| 167 | } |
| 168 | |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 169 | mWaveFormat = U16_LE_AT(formatSpec); |
| 170 | if (mWaveFormat != WAVE_FORMAT_PCM |
| 171 | && mWaveFormat != WAVE_FORMAT_ALAW |
| 172 | && mWaveFormat != WAVE_FORMAT_MULAW) { |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 173 | return ERROR_UNSUPPORTED; |
| 174 | } |
| 175 | |
| 176 | mNumChannels = U16_LE_AT(&formatSpec[2]); |
| 177 | if (mNumChannels != 1 && mNumChannels != 2) { |
| 178 | return ERROR_UNSUPPORTED; |
| 179 | } |
| 180 | |
| 181 | mSampleRate = U32_LE_AT(&formatSpec[4]); |
| 182 | |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 183 | if (mSampleRate == 0) { |
| 184 | return ERROR_MALFORMED; |
| 185 | } |
| 186 | |
| 187 | mBitsPerSample = U16_LE_AT(&formatSpec[14]); |
| 188 | |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 189 | if (mWaveFormat == WAVE_FORMAT_PCM) { |
| 190 | if (mBitsPerSample != 8 && mBitsPerSample != 16 |
| 191 | && mBitsPerSample != 24) { |
| 192 | return ERROR_UNSUPPORTED; |
| 193 | } |
| 194 | } else { |
| 195 | CHECK(mWaveFormat == WAVE_FORMAT_MULAW |
| 196 | || mWaveFormat == WAVE_FORMAT_ALAW); |
| 197 | if (mBitsPerSample != 8) { |
| 198 | return ERROR_UNSUPPORTED; |
| 199 | } |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | mValidFormat = true; |
| 203 | } else if (!memcmp(chunkHeader, "data", 4)) { |
| 204 | if (mValidFormat) { |
| 205 | mDataOffset = offset; |
| 206 | mDataSize = chunkSize; |
| 207 | |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 208 | mTrackMeta = new MetaData; |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 209 | |
| 210 | switch (mWaveFormat) { |
| 211 | case WAVE_FORMAT_PCM: |
| 212 | mTrackMeta->setCString( |
| 213 | kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW); |
| 214 | break; |
| 215 | case WAVE_FORMAT_ALAW: |
| 216 | mTrackMeta->setCString( |
| 217 | kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_G711_ALAW); |
| 218 | break; |
| 219 | default: |
| 220 | CHECK_EQ(mWaveFormat, WAVE_FORMAT_MULAW); |
| 221 | mTrackMeta->setCString( |
| 222 | kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_G711_MLAW); |
| 223 | break; |
| 224 | } |
| 225 | |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 226 | mTrackMeta->setInt32(kKeyChannelCount, mNumChannels); |
| 227 | mTrackMeta->setInt32(kKeySampleRate, mSampleRate); |
| 228 | |
| 229 | size_t bytesPerSample = mBitsPerSample >> 3; |
| 230 | |
| 231 | int64_t durationUs = |
| 232 | 1000000LL * (mDataSize / (mNumChannels * bytesPerSample)) |
| 233 | / mSampleRate; |
| 234 | |
| 235 | mTrackMeta->setInt64(kKeyDuration, durationUs); |
| 236 | |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 237 | return OK; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | offset += chunkSize; |
| 242 | } |
| 243 | |
| 244 | return NO_INIT; |
| 245 | } |
| 246 | |
| 247 | const size_t WAVSource::kMaxFrameSize = 32768; |
| 248 | |
| 249 | WAVSource::WAVSource( |
| 250 | const sp<DataSource> &dataSource, |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 251 | const sp<MetaData> &meta, |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 252 | uint16_t waveFormat, |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 253 | int32_t bitsPerSample, |
James Dong | b1262a8 | 2010-11-16 14:04:54 -0800 | [diff] [blame] | 254 | off64_t offset, size_t size) |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 255 | : mDataSource(dataSource), |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 256 | mMeta(meta), |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 257 | mWaveFormat(waveFormat), |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 258 | mSampleRate(0), |
| 259 | mNumChannels(0), |
| 260 | mBitsPerSample(bitsPerSample), |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 261 | mOffset(offset), |
| 262 | mSize(size), |
| 263 | mStarted(false), |
| 264 | mGroup(NULL) { |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 265 | CHECK(mMeta->findInt32(kKeySampleRate, &mSampleRate)); |
| 266 | CHECK(mMeta->findInt32(kKeyChannelCount, &mNumChannels)); |
Andreas Huber | 4b3913a | 2011-05-11 14:13:42 -0700 | [diff] [blame] | 267 | |
| 268 | mMeta->setInt32(kKeyMaxInputSize, kMaxFrameSize); |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | WAVSource::~WAVSource() { |
| 272 | if (mStarted) { |
| 273 | stop(); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | status_t WAVSource::start(MetaData *params) { |
| 278 | LOGV("WAVSource::start"); |
| 279 | |
| 280 | CHECK(!mStarted); |
| 281 | |
| 282 | mGroup = new MediaBufferGroup; |
| 283 | mGroup->add_buffer(new MediaBuffer(kMaxFrameSize)); |
| 284 | |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 285 | if (mBitsPerSample == 8) { |
| 286 | // As a temporary buffer for 8->16 bit conversion. |
| 287 | mGroup->add_buffer(new MediaBuffer(kMaxFrameSize)); |
| 288 | } |
| 289 | |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 290 | mCurrentPos = mOffset; |
| 291 | |
| 292 | mStarted = true; |
| 293 | |
| 294 | return OK; |
| 295 | } |
| 296 | |
| 297 | status_t WAVSource::stop() { |
| 298 | LOGV("WAVSource::stop"); |
| 299 | |
| 300 | CHECK(mStarted); |
| 301 | |
| 302 | delete mGroup; |
| 303 | mGroup = NULL; |
| 304 | |
| 305 | mStarted = false; |
| 306 | |
| 307 | return OK; |
| 308 | } |
| 309 | |
| 310 | sp<MetaData> WAVSource::getFormat() { |
| 311 | LOGV("WAVSource::getFormat"); |
| 312 | |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 313 | return mMeta; |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 314 | } |
| 315 | |
| 316 | status_t WAVSource::read( |
| 317 | MediaBuffer **out, const ReadOptions *options) { |
| 318 | *out = NULL; |
| 319 | |
| 320 | int64_t seekTimeUs; |
Andreas Huber | 6624c9f | 2010-07-20 15:04:28 -0700 | [diff] [blame] | 321 | ReadOptions::SeekMode mode; |
| 322 | if (options != NULL && options->getSeekTo(&seekTimeUs, &mode)) { |
James Dong | 3996239 | 2010-12-13 15:24:48 -0800 | [diff] [blame] | 323 | int64_t pos = (seekTimeUs * mSampleRate) / 1000000 * mNumChannels * (mBitsPerSample >> 3); |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 324 | if (pos > mSize) { |
| 325 | pos = mSize; |
| 326 | } |
| 327 | mCurrentPos = pos + mOffset; |
| 328 | } |
| 329 | |
| 330 | MediaBuffer *buffer; |
| 331 | status_t err = mGroup->acquire_buffer(&buffer); |
| 332 | if (err != OK) { |
| 333 | return err; |
| 334 | } |
| 335 | |
Andreas Huber | 4f5bb1e | 2010-09-16 14:54:10 -0700 | [diff] [blame] | 336 | size_t maxBytesToRead = |
| 337 | mBitsPerSample == 8 ? kMaxFrameSize / 2 : kMaxFrameSize; |
| 338 | |
| 339 | size_t maxBytesAvailable = |
James Dong | b1262a8 | 2010-11-16 14:04:54 -0800 | [diff] [blame] | 340 | (mCurrentPos - mOffset >= (off64_t)mSize) |
Andreas Huber | 4f5bb1e | 2010-09-16 14:54:10 -0700 | [diff] [blame] | 341 | ? 0 : mSize - (mCurrentPos - mOffset); |
| 342 | |
| 343 | if (maxBytesToRead > maxBytesAvailable) { |
| 344 | maxBytesToRead = maxBytesAvailable; |
| 345 | } |
| 346 | |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 347 | ssize_t n = mDataSource->readAt( |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 348 | mCurrentPos, buffer->data(), |
Andreas Huber | 4f5bb1e | 2010-09-16 14:54:10 -0700 | [diff] [blame] | 349 | maxBytesToRead); |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 350 | |
| 351 | if (n <= 0) { |
| 352 | buffer->release(); |
| 353 | buffer = NULL; |
| 354 | |
| 355 | return ERROR_END_OF_STREAM; |
| 356 | } |
| 357 | |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 358 | buffer->set_range(0, n); |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 359 | |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 360 | if (mWaveFormat == WAVE_FORMAT_PCM) { |
| 361 | if (mBitsPerSample == 8) { |
| 362 | // Convert 8-bit unsigned samples to 16-bit signed. |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 363 | |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 364 | MediaBuffer *tmp; |
| 365 | CHECK_EQ(mGroup->acquire_buffer(&tmp), OK); |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 366 | |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 367 | // The new buffer holds the sample number of samples, but each |
| 368 | // one is 2 bytes wide. |
| 369 | tmp->set_range(0, 2 * n); |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 370 | |
Andreas Huber | 520b2a7 | 2010-08-09 09:54:59 -0700 | [diff] [blame] | 371 | int16_t *dst = (int16_t *)tmp->data(); |
| 372 | const uint8_t *src = (const uint8_t *)buffer->data(); |
| 373 | while (n-- > 0) { |
| 374 | *dst++ = ((int16_t)(*src) - 128) * 256; |
| 375 | ++src; |
| 376 | } |
| 377 | |
| 378 | buffer->release(); |
| 379 | buffer = tmp; |
| 380 | } else if (mBitsPerSample == 24) { |
| 381 | // Convert 24-bit signed samples to 16-bit signed. |
| 382 | |
| 383 | const uint8_t *src = |
| 384 | (const uint8_t *)buffer->data() + buffer->range_offset(); |
| 385 | int16_t *dst = (int16_t *)src; |
| 386 | |
| 387 | size_t numSamples = buffer->range_length() / 3; |
| 388 | for (size_t i = 0; i < numSamples; ++i) { |
| 389 | int32_t x = (int32_t)(src[0] | src[1] << 8 | src[2] << 16); |
| 390 | x = (x << 8) >> 8; // sign extension |
| 391 | |
| 392 | x = x >> 8; |
| 393 | *dst++ = (int16_t)x; |
| 394 | src += 3; |
| 395 | } |
| 396 | |
| 397 | buffer->set_range(buffer->range_offset(), 2 * numSamples); |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 398 | } |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 399 | } |
| 400 | |
| 401 | size_t bytesPerSample = mBitsPerSample >> 3; |
| 402 | |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 403 | buffer->meta_data()->setInt64( |
| 404 | kKeyTime, |
| 405 | 1000000LL * (mCurrentPos - mOffset) |
Andreas Huber | e9999cf | 2010-01-20 11:20:01 -0800 | [diff] [blame] | 406 | / (mNumChannels * bytesPerSample) / mSampleRate); |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 407 | |
Andreas Huber | ad98d38 | 2010-08-06 14:13:10 -0700 | [diff] [blame] | 408 | buffer->meta_data()->setInt32(kKeyIsSyncFrame, 1); |
James Dong | 005de48 | 2011-03-15 09:32:53 -0700 | [diff] [blame] | 409 | mCurrentPos += n; |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 410 | |
| 411 | *out = buffer; |
| 412 | |
| 413 | return OK; |
| 414 | } |
| 415 | |
| 416 | //////////////////////////////////////////////////////////////////////////////// |
| 417 | |
| 418 | bool SniffWAV( |
Andreas Huber | efdd088 | 2010-08-25 11:09:41 -0700 | [diff] [blame] | 419 | const sp<DataSource> &source, String8 *mimeType, float *confidence, |
| 420 | sp<AMessage> *) { |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 421 | char header[12]; |
| 422 | if (source->readAt(0, header, sizeof(header)) < (ssize_t)sizeof(header)) { |
| 423 | return false; |
| 424 | } |
| 425 | |
| 426 | if (memcmp(header, "RIFF", 4) || memcmp(&header[8], "WAVE", 4)) { |
| 427 | return false; |
| 428 | } |
| 429 | |
James Dong | 4d3cdb5 | 2011-03-22 18:48:58 -0700 | [diff] [blame] | 430 | sp<MediaExtractor> extractor = new WAVExtractor(source); |
| 431 | if (extractor->countTracks() == 0) { |
| 432 | return false; |
| 433 | } |
| 434 | |
Andreas Huber | 6bce6d8 | 2009-11-03 16:00:58 -0800 | [diff] [blame] | 435 | *mimeType = MEDIA_MIMETYPE_CONTAINER_WAV; |
| 436 | *confidence = 0.3f; |
| 437 | |
| 438 | return true; |
| 439 | } |
| 440 | |
| 441 | } // namespace android |
| 442 | |