| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| //#define LOG_NDEBUG 0 |
| #define LOG_TAG "MatroskaExtractor" |
| #include <utils/Log.h> |
| |
| #include "MatroskaExtractor.h" |
| |
| #include "mkvparser.hpp" |
| |
| #include <media/stagefright/foundation/ADebug.h> |
| #include <media/stagefright/foundation/hexdump.h> |
| #include <media/stagefright/DataSource.h> |
| #include <media/stagefright/MediaBuffer.h> |
| #include <media/stagefright/MediaDefs.h> |
| #include <media/stagefright/MediaErrors.h> |
| #include <media/stagefright/MediaSource.h> |
| #include <media/stagefright/MetaData.h> |
| #include <media/stagefright/Utils.h> |
| #include <utils/String8.h> |
| |
| namespace android { |
| |
| struct DataSourceReader : public mkvparser::IMkvReader { |
| DataSourceReader(const sp<DataSource> &source) |
| : mSource(source) { |
| } |
| |
| virtual int Read(long long position, long length, unsigned char* buffer) { |
| CHECK(position >= 0); |
| CHECK(length >= 0); |
| |
| if (length == 0) { |
| return 0; |
| } |
| |
| ssize_t n = mSource->readAt(position, buffer, length); |
| |
| if (n <= 0) { |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| virtual int Length(long long* total, long long* available) { |
| off64_t size; |
| if (mSource->getSize(&size) != OK) { |
| *total = -1; |
| *available = (long long)((1ull << 63) - 1); |
| |
| return 0; |
| } |
| |
| if (total) { |
| *total = size; |
| } |
| |
| if (available) { |
| *available = size; |
| } |
| |
| return 0; |
| } |
| |
| private: |
| sp<DataSource> mSource; |
| |
| DataSourceReader(const DataSourceReader &); |
| DataSourceReader &operator=(const DataSourceReader &); |
| }; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| struct BlockIterator { |
| BlockIterator(MatroskaExtractor *extractor, unsigned long trackNum); |
| |
| bool eos() const; |
| |
| void advance(); |
| void reset(); |
| void seek(int64_t seekTimeUs, bool seekToKeyFrame); |
| |
| const mkvparser::Block *block() const; |
| int64_t blockTimeUs() const; |
| |
| private: |
| MatroskaExtractor *mExtractor; |
| unsigned long mTrackNum; |
| |
| const mkvparser::Cluster *mCluster; |
| const mkvparser::BlockEntry *mBlockEntry; |
| long mBlockEntryIndex; |
| |
| void advance_l(); |
| |
| BlockIterator(const BlockIterator &); |
| BlockIterator &operator=(const BlockIterator &); |
| }; |
| |
| struct MatroskaSource : public MediaSource { |
| MatroskaSource( |
| const sp<MatroskaExtractor> &extractor, size_t index); |
| |
| virtual status_t start(MetaData *params); |
| virtual status_t stop(); |
| |
| virtual sp<MetaData> getFormat(); |
| |
| virtual status_t read( |
| MediaBuffer **buffer, const ReadOptions *options); |
| |
| protected: |
| virtual ~MatroskaSource(); |
| |
| private: |
| enum Type { |
| AVC, |
| AAC, |
| OTHER |
| }; |
| |
| sp<MatroskaExtractor> mExtractor; |
| size_t mTrackIndex; |
| Type mType; |
| bool mIsAudio; |
| BlockIterator mBlockIter; |
| size_t mNALSizeLen; // for type AVC |
| |
| List<MediaBuffer *> mPendingFrames; |
| |
| status_t advance(); |
| |
| status_t readBlock(); |
| void clearPendingFrames(); |
| |
| MatroskaSource(const MatroskaSource &); |
| MatroskaSource &operator=(const MatroskaSource &); |
| }; |
| |
| MatroskaSource::MatroskaSource( |
| const sp<MatroskaExtractor> &extractor, size_t index) |
| : mExtractor(extractor), |
| mTrackIndex(index), |
| mType(OTHER), |
| mIsAudio(false), |
| mBlockIter(mExtractor.get(), |
| mExtractor->mTracks.itemAt(index).mTrackNum), |
| mNALSizeLen(0) { |
| sp<MetaData> meta = mExtractor->mTracks.itemAt(index).mMeta; |
| |
| const char *mime; |
| CHECK(meta->findCString(kKeyMIMEType, &mime)); |
| |
| mIsAudio = !strncasecmp("audio/", mime, 6); |
| |
| if (!strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC)) { |
| mType = AVC; |
| |
| uint32_t dummy; |
| const uint8_t *avcc; |
| size_t avccSize; |
| CHECK(meta->findData( |
| kKeyAVCC, &dummy, (const void **)&avcc, &avccSize)); |
| |
| CHECK_GE(avccSize, 5u); |
| |
| mNALSizeLen = 1 + (avcc[4] & 3); |
| ALOGV("mNALSizeLen = %d", mNALSizeLen); |
| } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC)) { |
| mType = AAC; |
| } |
| } |
| |
| MatroskaSource::~MatroskaSource() { |
| clearPendingFrames(); |
| } |
| |
| status_t MatroskaSource::start(MetaData *params) { |
| mBlockIter.reset(); |
| |
| return OK; |
| } |
| |
| status_t MatroskaSource::stop() { |
| clearPendingFrames(); |
| |
| return OK; |
| } |
| |
| sp<MetaData> MatroskaSource::getFormat() { |
| return mExtractor->mTracks.itemAt(mTrackIndex).mMeta; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| BlockIterator::BlockIterator( |
| MatroskaExtractor *extractor, unsigned long trackNum) |
| : mExtractor(extractor), |
| mTrackNum(trackNum), |
| mCluster(NULL), |
| mBlockEntry(NULL), |
| mBlockEntryIndex(0) { |
| reset(); |
| } |
| |
| bool BlockIterator::eos() const { |
| return mCluster == NULL || mCluster->EOS(); |
| } |
| |
| void BlockIterator::advance() { |
| Mutex::Autolock autoLock(mExtractor->mLock); |
| advance_l(); |
| } |
| |
| void BlockIterator::advance_l() { |
| for (;;) { |
| long res = mCluster->GetEntry(mBlockEntryIndex, mBlockEntry); |
| ALOGV("GetEntry returned %ld", res); |
| |
| long long pos; |
| long len; |
| if (res < 0) { |
| // Need to parse this cluster some more |
| |
| CHECK_EQ(res, mkvparser::E_BUFFER_NOT_FULL); |
| |
| res = mCluster->Parse(pos, len); |
| ALOGV("Parse returned %ld", res); |
| |
| if (res < 0) { |
| // I/O error |
| |
| LOGE("Cluster::Parse returned result %ld", res); |
| |
| mCluster = NULL; |
| break; |
| } |
| |
| continue; |
| } else if (res == 0) { |
| // We're done with this cluster |
| |
| const mkvparser::Cluster *nextCluster; |
| res = mExtractor->mSegment->ParseNext( |
| mCluster, nextCluster, pos, len); |
| ALOGV("ParseNext returned %ld", res); |
| |
| if (res > 0) { |
| // EOF |
| |
| mCluster = NULL; |
| break; |
| } |
| |
| CHECK_EQ(res, 0); |
| CHECK(nextCluster != NULL); |
| CHECK(!nextCluster->EOS()); |
| |
| mCluster = nextCluster; |
| |
| res = mCluster->Parse(pos, len); |
| ALOGV("Parse (2) returned %ld", res); |
| CHECK_GE(res, 0); |
| |
| mBlockEntryIndex = 0; |
| continue; |
| } |
| |
| CHECK(mBlockEntry != NULL); |
| CHECK(mBlockEntry->GetBlock() != NULL); |
| ++mBlockEntryIndex; |
| |
| if (mBlockEntry->GetBlock()->GetTrackNumber() == mTrackNum) { |
| break; |
| } |
| } |
| } |
| |
| void BlockIterator::reset() { |
| Mutex::Autolock autoLock(mExtractor->mLock); |
| |
| mCluster = mExtractor->mSegment->GetFirst(); |
| mBlockEntry = NULL; |
| mBlockEntryIndex = 0; |
| |
| do { |
| advance_l(); |
| } while (!eos() && block()->GetTrackNumber() != mTrackNum); |
| } |
| |
| void BlockIterator::seek(int64_t seekTimeUs, bool seekToKeyFrame) { |
| Mutex::Autolock autoLock(mExtractor->mLock); |
| |
| mCluster = mExtractor->mSegment->FindCluster(seekTimeUs * 1000ll); |
| mBlockEntry = NULL; |
| mBlockEntryIndex = 0; |
| |
| do { |
| advance_l(); |
| } |
| while (!eos() && block()->GetTrackNumber() != mTrackNum); |
| |
| if (seekToKeyFrame) { |
| while (!eos() && !mBlockEntry->GetBlock()->IsKey()) { |
| advance_l(); |
| } |
| } |
| } |
| |
| const mkvparser::Block *BlockIterator::block() const { |
| CHECK(!eos()); |
| |
| return mBlockEntry->GetBlock(); |
| } |
| |
| int64_t BlockIterator::blockTimeUs() const { |
| return (mBlockEntry->GetBlock()->GetTime(mCluster) + 500ll) / 1000ll; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| static unsigned U24_AT(const uint8_t *ptr) { |
| return ptr[0] << 16 | ptr[1] << 8 | ptr[2]; |
| } |
| |
| static size_t clz(uint8_t x) { |
| size_t numLeadingZeroes = 0; |
| |
| while (!(x & 0x80)) { |
| ++numLeadingZeroes; |
| x = x << 1; |
| } |
| |
| return numLeadingZeroes; |
| } |
| |
| void MatroskaSource::clearPendingFrames() { |
| while (!mPendingFrames.empty()) { |
| MediaBuffer *frame = *mPendingFrames.begin(); |
| mPendingFrames.erase(mPendingFrames.begin()); |
| |
| frame->release(); |
| frame = NULL; |
| } |
| } |
| |
| status_t MatroskaSource::readBlock() { |
| CHECK(mPendingFrames.empty()); |
| |
| if (mBlockIter.eos()) { |
| return ERROR_END_OF_STREAM; |
| } |
| |
| const mkvparser::Block *block = mBlockIter.block(); |
| |
| int64_t timeUs = mBlockIter.blockTimeUs(); |
| |
| for (int i = 0; i < block->GetFrameCount(); ++i) { |
| const mkvparser::Block::Frame &frame = block->GetFrame(i); |
| |
| MediaBuffer *mbuf = new MediaBuffer(frame.len); |
| mbuf->meta_data()->setInt64(kKeyTime, timeUs); |
| mbuf->meta_data()->setInt32(kKeyIsSyncFrame, block->IsKey()); |
| |
| long n = frame.Read(mExtractor->mReader, (unsigned char *)mbuf->data()); |
| if (n != 0) { |
| mPendingFrames.clear(); |
| |
| mBlockIter.advance(); |
| return ERROR_IO; |
| } |
| |
| mPendingFrames.push_back(mbuf); |
| } |
| |
| mBlockIter.advance(); |
| |
| return OK; |
| } |
| |
| status_t MatroskaSource::read( |
| MediaBuffer **out, const ReadOptions *options) { |
| *out = NULL; |
| |
| int64_t seekTimeUs; |
| ReadOptions::SeekMode mode; |
| if (options && options->getSeekTo(&seekTimeUs, &mode) |
| && !mExtractor->isLiveStreaming()) { |
| clearPendingFrames(); |
| |
| // Apparently keyframe indication in audio tracks is unreliable, |
| // fortunately in all our currently supported audio encodings every |
| // frame is effectively a keyframe. |
| mBlockIter.seek(seekTimeUs, !mIsAudio); |
| } |
| |
| again: |
| while (mPendingFrames.empty()) { |
| status_t err = readBlock(); |
| |
| if (err != OK) { |
| clearPendingFrames(); |
| |
| return err; |
| } |
| } |
| |
| MediaBuffer *frame = *mPendingFrames.begin(); |
| mPendingFrames.erase(mPendingFrames.begin()); |
| |
| if (mType != AVC) { |
| *out = frame; |
| |
| return OK; |
| } |
| |
| // Each input frame contains one or more NAL fragments, each fragment |
| // is prefixed by mNALSizeLen bytes giving the fragment length, |
| // followed by a corresponding number of bytes containing the fragment. |
| // We output all these fragments into a single large buffer separated |
| // by startcodes (0x00 0x00 0x00 0x01). |
| |
| const uint8_t *srcPtr = |
| (const uint8_t *)frame->data() + frame->range_offset(); |
| |
| size_t srcSize = frame->range_length(); |
| |
| size_t dstSize = 0; |
| MediaBuffer *buffer = NULL; |
| uint8_t *dstPtr = NULL; |
| |
| for (int32_t pass = 0; pass < 2; ++pass) { |
| size_t srcOffset = 0; |
| size_t dstOffset = 0; |
| while (srcOffset + mNALSizeLen <= srcSize) { |
| size_t NALsize; |
| switch (mNALSizeLen) { |
| case 1: NALsize = srcPtr[srcOffset]; break; |
| case 2: NALsize = U16_AT(srcPtr + srcOffset); break; |
| case 3: NALsize = U24_AT(srcPtr + srcOffset); break; |
| case 4: NALsize = U32_AT(srcPtr + srcOffset); break; |
| default: |
| TRESPASS(); |
| } |
| |
| if (srcOffset + mNALSizeLen + NALsize > srcSize) { |
| break; |
| } |
| |
| if (pass == 1) { |
| memcpy(&dstPtr[dstOffset], "\x00\x00\x00\x01", 4); |
| |
| memcpy(&dstPtr[dstOffset + 4], |
| &srcPtr[srcOffset + mNALSizeLen], |
| NALsize); |
| } |
| |
| dstOffset += 4; // 0x00 00 00 01 |
| dstOffset += NALsize; |
| |
| srcOffset += mNALSizeLen + NALsize; |
| } |
| |
| if (srcOffset < srcSize) { |
| // There were trailing bytes or not enough data to complete |
| // a fragment. |
| |
| frame->release(); |
| frame = NULL; |
| |
| return ERROR_MALFORMED; |
| } |
| |
| if (pass == 0) { |
| dstSize = dstOffset; |
| |
| buffer = new MediaBuffer(dstSize); |
| |
| int64_t timeUs; |
| CHECK(frame->meta_data()->findInt64(kKeyTime, &timeUs)); |
| int32_t isSync; |
| CHECK(frame->meta_data()->findInt32(kKeyIsSyncFrame, &isSync)); |
| |
| buffer->meta_data()->setInt64(kKeyTime, timeUs); |
| buffer->meta_data()->setInt32(kKeyIsSyncFrame, isSync); |
| |
| dstPtr = (uint8_t *)buffer->data(); |
| } |
| } |
| |
| frame->release(); |
| frame = NULL; |
| |
| *out = buffer; |
| |
| return OK; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| MatroskaExtractor::MatroskaExtractor(const sp<DataSource> &source) |
| : mDataSource(source), |
| mReader(new DataSourceReader(mDataSource)), |
| mSegment(NULL), |
| mExtractedThumbnails(false), |
| mIsWebm(false) { |
| off64_t size; |
| mIsLiveStreaming = |
| (mDataSource->flags() |
| & (DataSource::kWantsPrefetching |
| | DataSource::kIsCachingDataSource)) |
| && mDataSource->getSize(&size) != OK; |
| |
| mkvparser::EBMLHeader ebmlHeader; |
| long long pos; |
| if (ebmlHeader.Parse(mReader, pos) < 0) { |
| return; |
| } |
| |
| if (ebmlHeader.m_docType && !strcmp("webm", ebmlHeader.m_docType)) { |
| mIsWebm = true; |
| } |
| |
| long long ret = |
| mkvparser::Segment::CreateInstance(mReader, pos, mSegment); |
| |
| if (ret) { |
| CHECK(mSegment == NULL); |
| return; |
| } |
| |
| if (isLiveStreaming()) { |
| ret = mSegment->ParseHeaders(); |
| CHECK_EQ(ret, 0); |
| |
| long len; |
| ret = mSegment->LoadCluster(pos, len); |
| CHECK_EQ(ret, 0); |
| } else { |
| ret = mSegment->Load(); |
| } |
| |
| if (ret < 0) { |
| delete mSegment; |
| mSegment = NULL; |
| return; |
| } |
| |
| #if 0 |
| const mkvparser::SegmentInfo *info = mSegment->GetInfo(); |
| LOGI("muxing app: %s, writing app: %s", |
| info->GetMuxingAppAsUTF8(), |
| info->GetWritingAppAsUTF8()); |
| #endif |
| |
| addTracks(); |
| } |
| |
| MatroskaExtractor::~MatroskaExtractor() { |
| delete mSegment; |
| mSegment = NULL; |
| |
| delete mReader; |
| mReader = NULL; |
| } |
| |
| size_t MatroskaExtractor::countTracks() { |
| return mTracks.size(); |
| } |
| |
| sp<MediaSource> MatroskaExtractor::getTrack(size_t index) { |
| if (index >= mTracks.size()) { |
| return NULL; |
| } |
| |
| return new MatroskaSource(this, index); |
| } |
| |
| sp<MetaData> MatroskaExtractor::getTrackMetaData( |
| size_t index, uint32_t flags) { |
| if (index >= mTracks.size()) { |
| return NULL; |
| } |
| |
| if ((flags & kIncludeExtensiveMetaData) && !mExtractedThumbnails |
| && !isLiveStreaming()) { |
| findThumbnails(); |
| mExtractedThumbnails = true; |
| } |
| |
| return mTracks.itemAt(index).mMeta; |
| } |
| |
| bool MatroskaExtractor::isLiveStreaming() const { |
| return mIsLiveStreaming; |
| } |
| |
| static void addESDSFromAudioSpecificInfo( |
| const sp<MetaData> &meta, const void *asi, size_t asiSize) { |
| static const uint8_t kStaticESDS[] = { |
| 0x03, 22, |
| 0x00, 0x00, // ES_ID |
| 0x00, // streamDependenceFlag, URL_Flag, OCRstreamFlag |
| |
| 0x04, 17, |
| 0x40, // Audio ISO/IEC 14496-3 |
| 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, |
| |
| 0x05, |
| // AudioSpecificInfo (with size prefix) follows |
| }; |
| |
| // Make sure all sizes can be coded in a single byte. |
| CHECK(asiSize + 22 - 2 < 128); |
| size_t esdsSize = sizeof(kStaticESDS) + asiSize + 1; |
| uint8_t *esds = new uint8_t[esdsSize]; |
| memcpy(esds, kStaticESDS, sizeof(kStaticESDS)); |
| uint8_t *ptr = esds + sizeof(kStaticESDS); |
| *ptr++ = asiSize; |
| memcpy(ptr, asi, asiSize); |
| |
| // Increment by codecPrivateSize less 2 bytes that are accounted for |
| // already in lengths of 22/17 |
| esds[1] += asiSize - 2; |
| esds[6] += asiSize - 2; |
| |
| meta->setData(kKeyESDS, 0, esds, esdsSize); |
| |
| delete[] esds; |
| esds = NULL; |
| } |
| |
| void addVorbisCodecInfo( |
| const sp<MetaData> &meta, |
| const void *_codecPrivate, size_t codecPrivateSize) { |
| // printf("vorbis private data follows:\n"); |
| // hexdump(_codecPrivate, codecPrivateSize); |
| |
| CHECK(codecPrivateSize >= 3); |
| |
| const uint8_t *codecPrivate = (const uint8_t *)_codecPrivate; |
| CHECK(codecPrivate[0] == 0x02); |
| |
| size_t len1 = codecPrivate[1]; |
| size_t len2 = codecPrivate[2]; |
| |
| CHECK(codecPrivateSize > 3 + len1 + len2); |
| |
| CHECK(codecPrivate[3] == 0x01); |
| meta->setData(kKeyVorbisInfo, 0, &codecPrivate[3], len1); |
| |
| CHECK(codecPrivate[len1 + 3] == 0x03); |
| |
| CHECK(codecPrivate[len1 + len2 + 3] == 0x05); |
| meta->setData( |
| kKeyVorbisBooks, 0, &codecPrivate[len1 + len2 + 3], |
| codecPrivateSize - len1 - len2 - 3); |
| } |
| |
| void MatroskaExtractor::addTracks() { |
| const mkvparser::Tracks *tracks = mSegment->GetTracks(); |
| |
| for (size_t index = 0; index < tracks->GetTracksCount(); ++index) { |
| const mkvparser::Track *track = tracks->GetTrackByIndex(index); |
| |
| if (track == NULL) { |
| // Apparently this is currently valid (if unexpected) behaviour |
| // of the mkv parser lib. |
| continue; |
| } |
| |
| const char *const codecID = track->GetCodecId(); |
| ALOGV("codec id = %s", codecID); |
| ALOGV("codec name = %s", track->GetCodecNameAsUTF8()); |
| |
| size_t codecPrivateSize; |
| const unsigned char *codecPrivate = |
| track->GetCodecPrivate(codecPrivateSize); |
| |
| enum { VIDEO_TRACK = 1, AUDIO_TRACK = 2 }; |
| |
| sp<MetaData> meta = new MetaData; |
| |
| switch (track->GetType()) { |
| case VIDEO_TRACK: |
| { |
| const mkvparser::VideoTrack *vtrack = |
| static_cast<const mkvparser::VideoTrack *>(track); |
| |
| if (!strcmp("V_MPEG4/ISO/AVC", codecID)) { |
| meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_VIDEO_AVC); |
| meta->setData(kKeyAVCC, 0, codecPrivate, codecPrivateSize); |
| } else if (!strcmp("V_VP8", codecID)) { |
| meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_VIDEO_VPX); |
| } else { |
| continue; |
| } |
| |
| meta->setInt32(kKeyWidth, vtrack->GetWidth()); |
| meta->setInt32(kKeyHeight, vtrack->GetHeight()); |
| break; |
| } |
| |
| case AUDIO_TRACK: |
| { |
| const mkvparser::AudioTrack *atrack = |
| static_cast<const mkvparser::AudioTrack *>(track); |
| |
| if (!strcmp("A_AAC", codecID)) { |
| meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_AAC); |
| CHECK(codecPrivateSize >= 2); |
| |
| addESDSFromAudioSpecificInfo( |
| meta, codecPrivate, codecPrivateSize); |
| } else if (!strcmp("A_VORBIS", codecID)) { |
| meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_VORBIS); |
| |
| addVorbisCodecInfo(meta, codecPrivate, codecPrivateSize); |
| } else { |
| continue; |
| } |
| |
| meta->setInt32(kKeySampleRate, atrack->GetSamplingRate()); |
| meta->setInt32(kKeyChannelCount, atrack->GetChannels()); |
| break; |
| } |
| |
| default: |
| continue; |
| } |
| |
| long long durationNs = mSegment->GetDuration(); |
| meta->setInt64(kKeyDuration, (durationNs + 500) / 1000); |
| |
| mTracks.push(); |
| TrackInfo *trackInfo = &mTracks.editItemAt(mTracks.size() - 1); |
| trackInfo->mTrackNum = track->GetNumber(); |
| trackInfo->mMeta = meta; |
| } |
| } |
| |
| void MatroskaExtractor::findThumbnails() { |
| for (size_t i = 0; i < mTracks.size(); ++i) { |
| TrackInfo *info = &mTracks.editItemAt(i); |
| |
| const char *mime; |
| CHECK(info->mMeta->findCString(kKeyMIMEType, &mime)); |
| |
| if (strncasecmp(mime, "video/", 6)) { |
| continue; |
| } |
| |
| BlockIterator iter(this, info->mTrackNum); |
| int32_t i = 0; |
| int64_t thumbnailTimeUs = 0; |
| size_t maxBlockSize = 0; |
| while (!iter.eos() && i < 20) { |
| if (iter.block()->IsKey()) { |
| ++i; |
| |
| size_t blockSize = 0; |
| for (int i = 0; i < iter.block()->GetFrameCount(); ++i) { |
| blockSize += iter.block()->GetFrame(i).len; |
| } |
| |
| if (blockSize > maxBlockSize) { |
| maxBlockSize = blockSize; |
| thumbnailTimeUs = iter.blockTimeUs(); |
| } |
| } |
| iter.advance(); |
| } |
| info->mMeta->setInt64(kKeyThumbnailTime, thumbnailTimeUs); |
| } |
| } |
| |
| sp<MetaData> MatroskaExtractor::getMetaData() { |
| sp<MetaData> meta = new MetaData; |
| |
| meta->setCString( |
| kKeyMIMEType, |
| mIsWebm ? "video/webm" : MEDIA_MIMETYPE_CONTAINER_MATROSKA); |
| |
| return meta; |
| } |
| |
| uint32_t MatroskaExtractor::flags() const { |
| uint32_t x = CAN_PAUSE; |
| if (!isLiveStreaming()) { |
| x |= CAN_SEEK_BACKWARD | CAN_SEEK_FORWARD | CAN_SEEK; |
| } |
| |
| return x; |
| } |
| |
| bool SniffMatroska( |
| const sp<DataSource> &source, String8 *mimeType, float *confidence, |
| sp<AMessage> *) { |
| DataSourceReader reader(source); |
| mkvparser::EBMLHeader ebmlHeader; |
| long long pos; |
| if (ebmlHeader.Parse(&reader, pos) < 0) { |
| return false; |
| } |
| |
| mimeType->setTo(MEDIA_MIMETYPE_CONTAINER_MATROSKA); |
| *confidence = 0.6; |
| |
| return true; |
| } |
| |
| } // namespace android |