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1380 lines
39 KiB
1380 lines
39 KiB
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#define LOG_TAG "OggExtractor"
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#include <utils/Log.h>
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#include "include/OggExtractor.h"
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#include <cutils/properties.h>
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#include <media/stagefright/foundation/ABuffer.h>
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#include <media/stagefright/foundation/ADebug.h>
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#include <media/stagefright/foundation/base64.h>
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#include <media/stagefright/DataSource.h>
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#include <media/stagefright/MediaBuffer.h>
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#include <media/stagefright/MediaBufferGroup.h>
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#include <media/stagefright/MediaDefs.h>
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#include <media/stagefright/MediaErrors.h>
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#include <media/stagefright/MediaSource.h>
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#include <media/stagefright/MetaData.h>
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#include <media/stagefright/Utils.h>
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#include <utils/String8.h>
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extern "C" {
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#include <Tremolo/codec_internal.h>
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int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb);
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int _vorbis_unpack_info(vorbis_info *vi,oggpack_buffer *opb);
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int _vorbis_unpack_comment(vorbis_comment *vc,oggpack_buffer *opb);
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long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op);
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}
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namespace android {
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struct OggSource : public MediaSource {
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explicit OggSource(const sp<OggExtractor> &extractor);
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virtual sp<MetaData> getFormat();
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virtual status_t start(MetaData *params = NULL);
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virtual status_t stop();
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virtual status_t read(
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MediaBuffer **buffer, const ReadOptions *options = NULL);
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protected:
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virtual ~OggSource();
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private:
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sp<OggExtractor> mExtractor;
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bool mStarted;
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OggSource(const OggSource &);
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OggSource &operator=(const OggSource &);
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};
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struct MyOggExtractor {
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MyOggExtractor(
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const sp<DataSource> &source,
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const char *mimeType,
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size_t numHeaders,
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int64_t seekPreRollUs);
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virtual ~MyOggExtractor();
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sp<MetaData> getFormat() const;
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// Returns an approximate bitrate in bits per second.
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virtual uint64_t approxBitrate() const = 0;
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status_t seekToTime(int64_t timeUs);
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status_t seekToOffset(off64_t offset);
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virtual status_t readNextPacket(MediaBuffer **buffer) = 0;
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status_t init();
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sp<MetaData> getFileMetaData() { return mFileMeta; }
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protected:
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struct Page {
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uint64_t mGranulePosition;
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int32_t mPrevPacketSize;
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uint64_t mPrevPacketPos;
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uint32_t mSerialNo;
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uint32_t mPageNo;
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uint8_t mFlags;
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uint8_t mNumSegments;
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uint8_t mLace[255];
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};
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struct TOCEntry {
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off64_t mPageOffset;
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int64_t mTimeUs;
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};
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sp<DataSource> mSource;
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off64_t mOffset;
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Page mCurrentPage;
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uint64_t mCurGranulePosition;
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uint64_t mPrevGranulePosition;
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size_t mCurrentPageSize;
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bool mFirstPacketInPage;
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uint64_t mCurrentPageSamples;
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size_t mNextLaceIndex;
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const char *mMimeType;
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size_t mNumHeaders;
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int64_t mSeekPreRollUs;
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off64_t mFirstDataOffset;
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vorbis_info mVi;
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vorbis_comment mVc;
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sp<MetaData> mMeta;
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sp<MetaData> mFileMeta;
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Vector<TOCEntry> mTableOfContents;
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ssize_t readPage(off64_t offset, Page *page);
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status_t findNextPage(off64_t startOffset, off64_t *pageOffset);
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virtual int64_t getTimeUsOfGranule(uint64_t granulePos) const = 0;
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// Extract codec format, metadata tags, and various codec specific data;
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// the format and CSD's are required to setup the decoders for the enclosed media content.
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//
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// Valid values for `type` are:
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// 1 - bitstream identification header
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// 3 - comment header
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// 5 - codec setup header (Vorbis only)
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virtual status_t verifyHeader(MediaBuffer *buffer, uint8_t type) = 0;
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// Read the next ogg packet from the underlying data source; optionally
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// calculate the timestamp for the output packet whilst pretending
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// that we are parsing an Ogg Vorbis stream.
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//
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// *buffer is NULL'ed out immediately upon entry, and if successful a new buffer is allocated;
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// clients are responsible for releasing the original buffer.
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status_t _readNextPacket(MediaBuffer **buffer, bool calcVorbisTimestamp);
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int32_t getPacketBlockSize(MediaBuffer *buffer);
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void parseFileMetaData();
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status_t findPrevGranulePosition(off64_t pageOffset, uint64_t *granulePos);
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void buildTableOfContents();
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MyOggExtractor(const MyOggExtractor &);
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MyOggExtractor &operator=(const MyOggExtractor &);
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};
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struct MyVorbisExtractor : public MyOggExtractor {
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explicit MyVorbisExtractor(const sp<DataSource> &source)
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: MyOggExtractor(source,
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MEDIA_MIMETYPE_AUDIO_VORBIS,
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/* numHeaders */ 3,
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/* seekPreRollUs */ 0) {
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}
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virtual uint64_t approxBitrate() const;
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virtual status_t readNextPacket(MediaBuffer **buffer) {
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return _readNextPacket(buffer, /* calcVorbisTimestamp = */ true);
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}
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protected:
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virtual int64_t getTimeUsOfGranule(uint64_t granulePos) const {
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if (granulePos > INT64_MAX / 1000000ll) {
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return INT64_MAX;
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}
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return granulePos * 1000000ll / mVi.rate;
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}
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virtual status_t verifyHeader(MediaBuffer *buffer, uint8_t type);
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};
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struct MyOpusExtractor : public MyOggExtractor {
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static const int32_t kOpusSampleRate = 48000;
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static const int64_t kOpusSeekPreRollUs = 80000; // 80 ms
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explicit MyOpusExtractor(const sp<DataSource> &source)
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: MyOggExtractor(source, MEDIA_MIMETYPE_AUDIO_OPUS, /*numHeaders*/ 2, kOpusSeekPreRollUs),
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mChannelCount(0),
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mCodecDelay(0),
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mStartGranulePosition(-1) {
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}
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virtual uint64_t approxBitrate() const {
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return 0;
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}
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virtual status_t readNextPacket(MediaBuffer **buffer);
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protected:
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virtual int64_t getTimeUsOfGranule(uint64_t granulePos) const;
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virtual status_t verifyHeader(MediaBuffer *buffer, uint8_t type);
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private:
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status_t verifyOpusHeader(MediaBuffer *buffer);
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status_t verifyOpusComments(MediaBuffer *buffer);
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uint32_t getNumSamplesInPacket(MediaBuffer *buffer) const;
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uint8_t mChannelCount;
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uint16_t mCodecDelay;
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int64_t mStartGranulePosition;
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};
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static void extractAlbumArt(
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const sp<MetaData> &fileMeta, const void *data, size_t size);
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////////////////////////////////////////////////////////////////////////////////
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OggSource::OggSource(const sp<OggExtractor> &extractor)
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: mExtractor(extractor),
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mStarted(false) {
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}
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OggSource::~OggSource() {
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if (mStarted) {
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stop();
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}
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}
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sp<MetaData> OggSource::getFormat() {
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return mExtractor->mImpl->getFormat();
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}
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status_t OggSource::start(MetaData * /* params */) {
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if (mStarted) {
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return INVALID_OPERATION;
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}
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mStarted = true;
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return OK;
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}
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status_t OggSource::stop() {
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mStarted = false;
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return OK;
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}
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status_t OggSource::read(
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MediaBuffer **out, const ReadOptions *options) {
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*out = NULL;
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int64_t seekTimeUs;
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ReadOptions::SeekMode mode;
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if (options && options->getSeekTo(&seekTimeUs, &mode)) {
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status_t err = mExtractor->mImpl->seekToTime(seekTimeUs);
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if (err != OK) {
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return err;
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}
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}
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MediaBuffer *packet;
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status_t err = mExtractor->mImpl->readNextPacket(&packet);
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if (err != OK) {
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return err;
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}
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#if 0
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int64_t timeUs;
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if (packet->meta_data()->findInt64(kKeyTime, &timeUs)) {
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ALOGI("found time = %lld us", timeUs);
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} else {
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ALOGI("NO time");
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}
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#endif
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packet->meta_data()->setInt32(kKeyIsSyncFrame, 1);
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*out = packet;
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return OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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MyOggExtractor::MyOggExtractor(
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const sp<DataSource> &source,
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const char *mimeType,
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size_t numHeaders,
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int64_t seekPreRollUs)
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: mSource(source),
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mOffset(0),
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mCurGranulePosition(0),
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mPrevGranulePosition(0),
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mCurrentPageSize(0),
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mFirstPacketInPage(true),
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mCurrentPageSamples(0),
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mNextLaceIndex(0),
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mMimeType(mimeType),
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mNumHeaders(numHeaders),
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mSeekPreRollUs(seekPreRollUs),
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mFirstDataOffset(-1) {
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mCurrentPage.mNumSegments = 0;
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vorbis_info_init(&mVi);
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vorbis_comment_init(&mVc);
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}
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MyOggExtractor::~MyOggExtractor() {
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vorbis_comment_clear(&mVc);
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vorbis_info_clear(&mVi);
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}
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sp<MetaData> MyOggExtractor::getFormat() const {
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return mMeta;
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}
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status_t MyOggExtractor::findNextPage(
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off64_t startOffset, off64_t *pageOffset) {
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*pageOffset = startOffset;
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for (;;) {
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char signature[4];
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ssize_t n = mSource->readAt(*pageOffset, &signature, 4);
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if (n < 4) {
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*pageOffset = 0;
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return (n < 0) ? n : (status_t)ERROR_END_OF_STREAM;
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}
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if (!memcmp(signature, "OggS", 4)) {
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if (*pageOffset > startOffset) {
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ALOGV("skipped %lld bytes of junk to reach next frame",
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(long long)(*pageOffset - startOffset));
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}
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return OK;
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}
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++*pageOffset;
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}
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}
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// Given the offset of the "current" page, find the page immediately preceding
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// it (if any) and return its granule position.
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// To do this we back up from the "current" page's offset until we find any
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// page preceding it and then scan forward to just before the current page.
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status_t MyOggExtractor::findPrevGranulePosition(
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off64_t pageOffset, uint64_t *granulePos) {
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*granulePos = 0;
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off64_t prevPageOffset = 0;
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off64_t prevGuess = pageOffset;
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for (;;) {
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if (prevGuess >= 5000) {
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prevGuess -= 5000;
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} else {
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prevGuess = 0;
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}
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ALOGV("backing up %lld bytes", (long long)(pageOffset - prevGuess));
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status_t err = findNextPage(prevGuess, &prevPageOffset);
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if (err == ERROR_END_OF_STREAM) {
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// We are at the last page and didn't back off enough;
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// back off 5000 bytes more and try again.
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continue;
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} else if (err != OK) {
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return err;
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}
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if (prevPageOffset < pageOffset || prevGuess == 0) {
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break;
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}
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}
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if (prevPageOffset == pageOffset) {
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// We did not find a page preceding this one.
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return UNKNOWN_ERROR;
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}
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ALOGV("prevPageOffset at %lld, pageOffset at %lld",
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(long long)prevPageOffset, (long long)pageOffset);
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for (;;) {
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Page prevPage;
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ssize_t n = readPage(prevPageOffset, &prevPage);
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if (n <= 0) {
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return (status_t)n;
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}
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prevPageOffset += n;
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if (prevPageOffset == pageOffset) {
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*granulePos = prevPage.mGranulePosition;
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return OK;
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}
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}
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}
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status_t MyOggExtractor::seekToTime(int64_t timeUs) {
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timeUs -= mSeekPreRollUs;
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if (timeUs < 0) {
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timeUs = 0;
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}
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if (mTableOfContents.isEmpty()) {
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// Perform approximate seeking based on avg. bitrate.
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uint64_t bps = approxBitrate();
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if (bps <= 0) {
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return INVALID_OPERATION;
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}
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off64_t pos = timeUs * bps / 8000000ll;
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ALOGV("seeking to offset %lld", (long long)pos);
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return seekToOffset(pos);
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}
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size_t left = 0;
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size_t right_plus_one = mTableOfContents.size();
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while (left < right_plus_one) {
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size_t center = left + (right_plus_one - left) / 2;
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const TOCEntry &entry = mTableOfContents.itemAt(center);
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if (timeUs < entry.mTimeUs) {
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right_plus_one = center;
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} else if (timeUs > entry.mTimeUs) {
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left = center + 1;
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} else {
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left = center;
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break;
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}
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}
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if (left == mTableOfContents.size()) {
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--left;
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}
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const TOCEntry &entry = mTableOfContents.itemAt(left);
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ALOGV("seeking to entry %zu / %zu at offset %lld",
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left, mTableOfContents.size(), (long long)entry.mPageOffset);
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return seekToOffset(entry.mPageOffset);
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}
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status_t MyOggExtractor::seekToOffset(off64_t offset) {
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if (mFirstDataOffset >= 0 && offset < mFirstDataOffset) {
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// Once we know where the actual audio data starts (past the headers)
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// don't ever seek to anywhere before that.
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offset = mFirstDataOffset;
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}
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off64_t pageOffset;
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status_t err = findNextPage(offset, &pageOffset);
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if (err != OK) {
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return err;
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}
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// We found the page we wanted to seek to, but we'll also need
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// the page preceding it to determine how many valid samples are on
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// this page.
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findPrevGranulePosition(pageOffset, &mPrevGranulePosition);
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mOffset = pageOffset;
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mCurrentPageSize = 0;
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mFirstPacketInPage = true;
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mCurrentPageSamples = 0;
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mCurrentPage.mNumSegments = 0;
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mCurrentPage.mPrevPacketSize = -1;
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mNextLaceIndex = 0;
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// XXX what if new page continues packet from last???
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return OK;
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}
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ssize_t MyOggExtractor::readPage(off64_t offset, Page *page) {
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uint8_t header[27];
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ssize_t n;
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if ((n = mSource->readAt(offset, header, sizeof(header)))
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< (ssize_t)sizeof(header)) {
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ALOGV("failed to read %zu bytes at offset %#016llx, got %zd bytes",
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sizeof(header), (long long)offset, n);
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if (n < 0) {
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return n;
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} else if (n == 0) {
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return ERROR_END_OF_STREAM;
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} else {
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return ERROR_IO;
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}
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}
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if (memcmp(header, "OggS", 4)) {
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return ERROR_MALFORMED;
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}
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if (header[4] != 0) {
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// Wrong version.
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return ERROR_UNSUPPORTED;
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}
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page->mFlags = header[5];
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if (page->mFlags & ~7) {
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// Only bits 0-2 are defined in version 0.
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return ERROR_MALFORMED;
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}
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page->mGranulePosition = U64LE_AT(&header[6]);
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#if 0
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printf("granulePosition = %llu (0x%llx)\n",
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page->mGranulePosition, page->mGranulePosition);
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#endif
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page->mSerialNo = U32LE_AT(&header[14]);
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page->mPageNo = U32LE_AT(&header[18]);
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page->mNumSegments = header[26];
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if (mSource->readAt(
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offset + sizeof(header), page->mLace, page->mNumSegments)
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< (ssize_t)page->mNumSegments) {
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return ERROR_IO;
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}
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|
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size_t totalSize = 0;;
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for (size_t i = 0; i < page->mNumSegments; ++i) {
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totalSize += page->mLace[i];
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}
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#if 0
|
|
String8 tmp;
|
|
for (size_t i = 0; i < page->mNumSegments; ++i) {
|
|
char x[32];
|
|
sprintf(x, "%s%u", i > 0 ? ", " : "", (unsigned)page->mLace[i]);
|
|
|
|
tmp.append(x);
|
|
}
|
|
|
|
ALOGV("%c %s", page->mFlags & 1 ? '+' : ' ', tmp.string());
|
|
#endif
|
|
|
|
return sizeof(header) + page->mNumSegments + totalSize;
|
|
}
|
|
|
|
status_t MyOpusExtractor::readNextPacket(MediaBuffer **out) {
|
|
if (mOffset <= mFirstDataOffset && mStartGranulePosition < 0) {
|
|
// The first sample might not start at time 0; find out where by subtracting
|
|
// the number of samples on the first page from the granule position
|
|
// (position of last complete sample) of the first page. This happens
|
|
// the first time before we attempt to read a packet from the first page.
|
|
MediaBuffer *mBuf;
|
|
uint32_t numSamples = 0;
|
|
uint64_t curGranulePosition = 0;
|
|
while (true) {
|
|
status_t err = _readNextPacket(&mBuf, /* calcVorbisTimestamp = */false);
|
|
if (err != OK && err != ERROR_END_OF_STREAM) {
|
|
return err;
|
|
}
|
|
// First two pages are header pages.
|
|
if (err == ERROR_END_OF_STREAM || mCurrentPage.mPageNo > 2) {
|
|
break;
|
|
}
|
|
curGranulePosition = mCurrentPage.mGranulePosition;
|
|
numSamples += getNumSamplesInPacket(mBuf);
|
|
mBuf->release();
|
|
mBuf = NULL;
|
|
}
|
|
|
|
if (curGranulePosition > numSamples) {
|
|
mStartGranulePosition = curGranulePosition - numSamples;
|
|
} else {
|
|
mStartGranulePosition = 0;
|
|
}
|
|
seekToOffset(0);
|
|
}
|
|
|
|
status_t err = _readNextPacket(out, /* calcVorbisTimestamp = */false);
|
|
if (err != OK) {
|
|
return err;
|
|
}
|
|
|
|
int32_t currentPageSamples;
|
|
// Calculate timestamps by accumulating durations starting from the first sample of a page;
|
|
// We assume that we only seek to page boundaries.
|
|
if ((*out)->meta_data()->findInt32(kKeyValidSamples, ¤tPageSamples)) {
|
|
// first packet in page
|
|
if (mOffset == mFirstDataOffset) {
|
|
currentPageSamples -= mStartGranulePosition;
|
|
(*out)->meta_data()->setInt32(kKeyValidSamples, currentPageSamples);
|
|
}
|
|
mCurGranulePosition = mCurrentPage.mGranulePosition - currentPageSamples;
|
|
}
|
|
|
|
int64_t timeUs = getTimeUsOfGranule(mCurGranulePosition);
|
|
(*out)->meta_data()->setInt64(kKeyTime, timeUs);
|
|
|
|
uint32_t frames = getNumSamplesInPacket(*out);
|
|
mCurGranulePosition += frames;
|
|
return OK;
|
|
}
|
|
|
|
uint32_t MyOpusExtractor::getNumSamplesInPacket(MediaBuffer *buffer) const {
|
|
if (buffer == NULL || buffer->range_length() < 1) {
|
|
return 0;
|
|
}
|
|
|
|
uint8_t *data = (uint8_t *)buffer->data() + buffer->range_offset();
|
|
uint8_t toc = data[0];
|
|
uint8_t config = (toc >> 3) & 0x1f;
|
|
uint32_t frameSizesUs[] = {
|
|
10000, 20000, 40000, 60000, // 0...3
|
|
10000, 20000, 40000, 60000, // 4...7
|
|
10000, 20000, 40000, 60000, // 8...11
|
|
10000, 20000, // 12...13
|
|
10000, 20000, // 14...15
|
|
2500, 5000, 10000, 20000, // 16...19
|
|
2500, 5000, 10000, 20000, // 20...23
|
|
2500, 5000, 10000, 20000, // 24...27
|
|
2500, 5000, 10000, 20000 // 28...31
|
|
};
|
|
uint32_t frameSizeUs = frameSizesUs[config];
|
|
|
|
uint32_t numFrames;
|
|
uint8_t c = toc & 3;
|
|
switch (c) {
|
|
case 0:
|
|
numFrames = 1;
|
|
break;
|
|
case 1:
|
|
case 2:
|
|
numFrames = 2;
|
|
break;
|
|
case 3:
|
|
if (buffer->range_length() < 3) {
|
|
numFrames = 0;
|
|
} else {
|
|
numFrames = data[2] & 0x3f;
|
|
}
|
|
break;
|
|
default:
|
|
TRESPASS();
|
|
}
|
|
|
|
uint32_t numSamples = frameSizeUs * numFrames * kOpusSampleRate / 1000000;
|
|
return numSamples;
|
|
}
|
|
|
|
status_t MyOggExtractor::_readNextPacket(MediaBuffer **out, bool calcVorbisTimestamp) {
|
|
*out = NULL;
|
|
|
|
MediaBuffer *buffer = NULL;
|
|
int64_t timeUs = -1;
|
|
|
|
for (;;) {
|
|
size_t i;
|
|
size_t packetSize = 0;
|
|
bool gotFullPacket = false;
|
|
for (i = mNextLaceIndex; i < mCurrentPage.mNumSegments; ++i) {
|
|
uint8_t lace = mCurrentPage.mLace[i];
|
|
|
|
packetSize += lace;
|
|
|
|
if (lace < 255) {
|
|
gotFullPacket = true;
|
|
++i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (mNextLaceIndex < mCurrentPage.mNumSegments) {
|
|
off64_t dataOffset = mOffset + 27 + mCurrentPage.mNumSegments;
|
|
for (size_t j = 0; j < mNextLaceIndex; ++j) {
|
|
dataOffset += mCurrentPage.mLace[j];
|
|
}
|
|
|
|
size_t fullSize = packetSize;
|
|
if (buffer != NULL) {
|
|
fullSize += buffer->range_length();
|
|
}
|
|
if (fullSize > 16 * 1024 * 1024) { // arbitrary limit of 16 MB packet size
|
|
if (buffer != NULL) {
|
|
buffer->release();
|
|
}
|
|
ALOGE("b/36592202");
|
|
return ERROR_MALFORMED;
|
|
}
|
|
MediaBuffer *tmp = new (std::nothrow) MediaBuffer(fullSize);
|
|
if (tmp == NULL) {
|
|
if (buffer != NULL) {
|
|
buffer->release();
|
|
}
|
|
ALOGE("b/36592202");
|
|
return ERROR_MALFORMED;
|
|
}
|
|
if (buffer != NULL) {
|
|
memcpy(tmp->data(), buffer->data(), buffer->range_length());
|
|
tmp->set_range(0, buffer->range_length());
|
|
buffer->release();
|
|
} else {
|
|
tmp->set_range(0, 0);
|
|
}
|
|
buffer = tmp;
|
|
|
|
ssize_t n = mSource->readAt(
|
|
dataOffset,
|
|
(uint8_t *)buffer->data() + buffer->range_length(),
|
|
packetSize);
|
|
|
|
if (n < (ssize_t)packetSize) {
|
|
buffer->release();
|
|
ALOGV("failed to read %zu bytes at %#016llx, got %zd bytes",
|
|
packetSize, (long long)dataOffset, n);
|
|
return ERROR_IO;
|
|
}
|
|
|
|
buffer->set_range(0, fullSize);
|
|
|
|
mNextLaceIndex = i;
|
|
|
|
if (gotFullPacket) {
|
|
// We've just read the entire packet.
|
|
|
|
if (mFirstPacketInPage) {
|
|
buffer->meta_data()->setInt32(
|
|
kKeyValidSamples, mCurrentPageSamples);
|
|
mFirstPacketInPage = false;
|
|
}
|
|
|
|
if (calcVorbisTimestamp) {
|
|
int32_t curBlockSize = getPacketBlockSize(buffer);
|
|
if (mCurrentPage.mPrevPacketSize < 0) {
|
|
mCurrentPage.mPrevPacketSize = curBlockSize;
|
|
mCurrentPage.mPrevPacketPos =
|
|
mCurrentPage.mGranulePosition - mCurrentPageSamples;
|
|
timeUs = mCurrentPage.mPrevPacketPos * 1000000ll / mVi.rate;
|
|
} else {
|
|
// The effective block size is the average of the two overlapped blocks
|
|
int32_t actualBlockSize =
|
|
(curBlockSize + mCurrentPage.mPrevPacketSize) / 2;
|
|
timeUs = mCurrentPage.mPrevPacketPos * 1000000ll / mVi.rate;
|
|
// The actual size output by the decoder will be half the effective
|
|
// size, due to the overlap
|
|
mCurrentPage.mPrevPacketPos += actualBlockSize / 2;
|
|
mCurrentPage.mPrevPacketSize = curBlockSize;
|
|
}
|
|
buffer->meta_data()->setInt64(kKeyTime, timeUs);
|
|
}
|
|
*out = buffer;
|
|
|
|
return OK;
|
|
}
|
|
|
|
// fall through, the buffer now contains the start of the packet.
|
|
}
|
|
|
|
CHECK_EQ(mNextLaceIndex, mCurrentPage.mNumSegments);
|
|
|
|
mOffset += mCurrentPageSize;
|
|
ssize_t n = readPage(mOffset, &mCurrentPage);
|
|
|
|
if (n <= 0) {
|
|
if (buffer) {
|
|
buffer->release();
|
|
buffer = NULL;
|
|
}
|
|
|
|
ALOGV("readPage returned %zd", n);
|
|
|
|
return n < 0 ? n : (status_t)ERROR_END_OF_STREAM;
|
|
}
|
|
|
|
// Prevent a harmless unsigned integer overflow by clamping to 0
|
|
if (mCurrentPage.mGranulePosition >= mPrevGranulePosition) {
|
|
mCurrentPageSamples =
|
|
mCurrentPage.mGranulePosition - mPrevGranulePosition;
|
|
} else {
|
|
mCurrentPageSamples = 0;
|
|
}
|
|
mFirstPacketInPage = true;
|
|
|
|
mPrevGranulePosition = mCurrentPage.mGranulePosition;
|
|
|
|
mCurrentPageSize = n;
|
|
mNextLaceIndex = 0;
|
|
|
|
if (buffer != NULL) {
|
|
if ((mCurrentPage.mFlags & 1) == 0) {
|
|
// This page does not continue the packet, i.e. the packet
|
|
// is already complete.
|
|
|
|
if (timeUs >= 0) {
|
|
buffer->meta_data()->setInt64(kKeyTime, timeUs);
|
|
}
|
|
|
|
buffer->meta_data()->setInt32(
|
|
kKeyValidSamples, mCurrentPageSamples);
|
|
mFirstPacketInPage = false;
|
|
|
|
*out = buffer;
|
|
|
|
return OK;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
status_t MyOggExtractor::init() {
|
|
mMeta = new MetaData;
|
|
mMeta->setCString(kKeyMIMEType, mMimeType);
|
|
|
|
status_t err;
|
|
MediaBuffer *packet;
|
|
for (size_t i = 0; i < mNumHeaders; ++i) {
|
|
// ignore timestamp for configuration packets
|
|
if ((err = _readNextPacket(&packet, /* calcVorbisTimestamp = */ false)) != OK) {
|
|
return err;
|
|
}
|
|
ALOGV("read packet of size %zu\n", packet->range_length());
|
|
err = verifyHeader(packet, /* type = */ i * 2 + 1);
|
|
packet->release();
|
|
packet = NULL;
|
|
if (err != OK) {
|
|
return err;
|
|
}
|
|
}
|
|
|
|
mFirstDataOffset = mOffset + mCurrentPageSize;
|
|
|
|
off64_t size;
|
|
uint64_t lastGranulePosition;
|
|
if (!(mSource->flags() & DataSource::kIsCachingDataSource)
|
|
&& mSource->getSize(&size) == OK
|
|
&& findPrevGranulePosition(size, &lastGranulePosition) == OK) {
|
|
// Let's assume it's cheap to seek to the end.
|
|
// The granule position of the final page in the stream will
|
|
// give us the exact duration of the content, something that
|
|
// we can only approximate using avg. bitrate if seeking to
|
|
// the end is too expensive or impossible (live streaming).
|
|
|
|
int64_t durationUs = getTimeUsOfGranule(lastGranulePosition);
|
|
|
|
mMeta->setInt64(kKeyDuration, durationUs);
|
|
|
|
buildTableOfContents();
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
void MyOggExtractor::buildTableOfContents() {
|
|
off64_t offset = mFirstDataOffset;
|
|
Page page;
|
|
ssize_t pageSize;
|
|
while ((pageSize = readPage(offset, &page)) > 0) {
|
|
mTableOfContents.push();
|
|
|
|
TOCEntry &entry =
|
|
mTableOfContents.editItemAt(mTableOfContents.size() - 1);
|
|
|
|
entry.mPageOffset = offset;
|
|
entry.mTimeUs = getTimeUsOfGranule(page.mGranulePosition);
|
|
|
|
offset += (size_t)pageSize;
|
|
}
|
|
|
|
// Limit the maximum amount of RAM we spend on the table of contents,
|
|
// if necessary thin out the table evenly to trim it down to maximum
|
|
// size.
|
|
|
|
static const size_t kMaxTOCSize = 8192;
|
|
static const size_t kMaxNumTOCEntries = kMaxTOCSize / sizeof(TOCEntry);
|
|
|
|
size_t numerator = mTableOfContents.size();
|
|
|
|
if (numerator > kMaxNumTOCEntries) {
|
|
size_t denom = numerator - kMaxNumTOCEntries;
|
|
|
|
size_t accum = 0;
|
|
for (ssize_t i = mTableOfContents.size() - 1; i >= 0; --i) {
|
|
accum += denom;
|
|
if (accum >= numerator) {
|
|
mTableOfContents.removeAt(i);
|
|
accum -= numerator;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int32_t MyOggExtractor::getPacketBlockSize(MediaBuffer *buffer) {
|
|
const uint8_t *data =
|
|
(const uint8_t *)buffer->data() + buffer->range_offset();
|
|
|
|
size_t size = buffer->range_length();
|
|
|
|
ogg_buffer buf;
|
|
buf.data = (uint8_t *)data;
|
|
buf.size = size;
|
|
buf.refcount = 1;
|
|
buf.ptr.owner = NULL;
|
|
|
|
ogg_reference ref;
|
|
ref.buffer = &buf;
|
|
ref.begin = 0;
|
|
ref.length = size;
|
|
ref.next = NULL;
|
|
|
|
ogg_packet pack;
|
|
pack.packet = &ref;
|
|
pack.bytes = ref.length;
|
|
pack.b_o_s = 0;
|
|
pack.e_o_s = 0;
|
|
pack.granulepos = 0;
|
|
pack.packetno = 0;
|
|
|
|
return vorbis_packet_blocksize(&mVi, &pack);
|
|
}
|
|
|
|
int64_t MyOpusExtractor::getTimeUsOfGranule(uint64_t granulePos) const {
|
|
uint64_t pcmSamplePosition = 0;
|
|
if (granulePos > mCodecDelay) {
|
|
pcmSamplePosition = granulePos - mCodecDelay;
|
|
}
|
|
if (pcmSamplePosition > INT64_MAX / 1000000ll) {
|
|
return INT64_MAX;
|
|
}
|
|
return pcmSamplePosition * 1000000ll / kOpusSampleRate;
|
|
}
|
|
|
|
status_t MyOpusExtractor::verifyHeader(MediaBuffer *buffer, uint8_t type) {
|
|
switch (type) {
|
|
// there are actually no header types defined in the Opus spec; we choose 1 and 3 to mean
|
|
// header and comments such that we can share code with MyVorbisExtractor.
|
|
case 1:
|
|
return verifyOpusHeader(buffer);
|
|
case 3:
|
|
return verifyOpusComments(buffer);
|
|
default:
|
|
return INVALID_OPERATION;
|
|
}
|
|
}
|
|
|
|
status_t MyOpusExtractor::verifyOpusHeader(MediaBuffer *buffer) {
|
|
const size_t kOpusHeaderSize = 19;
|
|
const uint8_t *data =
|
|
(const uint8_t *)buffer->data() + buffer->range_offset();
|
|
|
|
size_t size = buffer->range_length();
|
|
|
|
if (size < kOpusHeaderSize
|
|
|| memcmp(data, "OpusHead", 8)
|
|
|| /* version = */ data[8] != 1) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
|
|
mChannelCount = data[9];
|
|
mCodecDelay = U16LE_AT(&data[10]);
|
|
|
|
mMeta->setData(kKeyOpusHeader, 0, data, size);
|
|
mMeta->setInt32(kKeySampleRate, kOpusSampleRate);
|
|
mMeta->setInt32(kKeyChannelCount, mChannelCount);
|
|
mMeta->setInt64(kKeyOpusSeekPreRoll /* ns */, kOpusSeekPreRollUs * 1000 /* = 80 ms*/);
|
|
mMeta->setInt64(kKeyOpusCodecDelay /* ns */,
|
|
mCodecDelay /* sample/s */ * 1000000000ll / kOpusSampleRate);
|
|
|
|
return OK;
|
|
}
|
|
|
|
status_t MyOpusExtractor::verifyOpusComments(MediaBuffer *buffer) {
|
|
// add artificial framing bit so we can reuse _vorbis_unpack_comment
|
|
int32_t commentSize = buffer->range_length() + 1;
|
|
sp<ABuffer> aBuf = new ABuffer(commentSize);
|
|
if (aBuf->capacity() <= buffer->range_length()) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
|
|
uint8_t* commentData = aBuf->data();
|
|
memcpy(commentData,
|
|
(uint8_t *)buffer->data() + buffer->range_offset(),
|
|
buffer->range_length());
|
|
|
|
ogg_buffer buf;
|
|
buf.data = commentData;
|
|
buf.size = commentSize;
|
|
buf.refcount = 1;
|
|
buf.ptr.owner = NULL;
|
|
|
|
ogg_reference ref;
|
|
ref.buffer = &buf;
|
|
ref.begin = 0;
|
|
ref.length = commentSize;
|
|
ref.next = NULL;
|
|
|
|
oggpack_buffer bits;
|
|
oggpack_readinit(&bits, &ref);
|
|
|
|
// skip 'OpusTags'
|
|
const char *OpusTags = "OpusTags";
|
|
const int32_t headerLen = strlen(OpusTags);
|
|
int32_t framingBitOffset = headerLen;
|
|
for (int i = 0; i < headerLen; ++i) {
|
|
char chr = oggpack_read(&bits, 8);
|
|
if (chr != OpusTags[i]) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
}
|
|
|
|
int32_t vendorLen = oggpack_read(&bits, 32);
|
|
framingBitOffset += 4;
|
|
if (vendorLen < 0 || vendorLen > commentSize - 8) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
// skip vendor string
|
|
framingBitOffset += vendorLen;
|
|
for (int i = 0; i < vendorLen; ++i) {
|
|
oggpack_read(&bits, 8);
|
|
}
|
|
|
|
int32_t n = oggpack_read(&bits, 32);
|
|
framingBitOffset += 4;
|
|
if (n < 0 || n > ((commentSize - oggpack_bytes(&bits)) >> 2)) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
for (int i = 0; i < n; ++i) {
|
|
int32_t len = oggpack_read(&bits, 32);
|
|
framingBitOffset += 4;
|
|
if (len < 0 || len > (commentSize - oggpack_bytes(&bits))) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
framingBitOffset += len;
|
|
for (int j = 0; j < len; ++j) {
|
|
oggpack_read(&bits, 8);
|
|
}
|
|
}
|
|
if (framingBitOffset < 0 || framingBitOffset >= commentSize) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
commentData[framingBitOffset] = 1;
|
|
|
|
buf.data = commentData + headerLen;
|
|
buf.size = commentSize - headerLen;
|
|
buf.refcount = 1;
|
|
buf.ptr.owner = NULL;
|
|
|
|
ref.buffer = &buf;
|
|
ref.begin = 0;
|
|
ref.length = commentSize - headerLen;
|
|
ref.next = NULL;
|
|
|
|
oggpack_readinit(&bits, &ref);
|
|
int err = _vorbis_unpack_comment(&mVc, &bits);
|
|
if (0 != err) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
|
|
parseFileMetaData();
|
|
return OK;
|
|
}
|
|
|
|
status_t MyVorbisExtractor::verifyHeader(
|
|
MediaBuffer *buffer, uint8_t type) {
|
|
const uint8_t *data =
|
|
(const uint8_t *)buffer->data() + buffer->range_offset();
|
|
|
|
size_t size = buffer->range_length();
|
|
|
|
if (size < 7 || data[0] != type || memcmp(&data[1], "vorbis", 6)) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
|
|
ogg_buffer buf;
|
|
buf.data = (uint8_t *)data;
|
|
buf.size = size;
|
|
buf.refcount = 1;
|
|
buf.ptr.owner = NULL;
|
|
|
|
ogg_reference ref;
|
|
ref.buffer = &buf;
|
|
ref.begin = 0;
|
|
ref.length = size;
|
|
ref.next = NULL;
|
|
|
|
oggpack_buffer bits;
|
|
oggpack_readinit(&bits, &ref);
|
|
|
|
if (oggpack_read(&bits, 8) != type) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
for (size_t i = 0; i < 6; ++i) {
|
|
oggpack_read(&bits, 8); // skip 'vorbis'
|
|
}
|
|
|
|
switch (type) {
|
|
case 1:
|
|
{
|
|
if (0 != _vorbis_unpack_info(&mVi, &bits)) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
|
|
mMeta->setData(kKeyVorbisInfo, 0, data, size);
|
|
mMeta->setInt32(kKeySampleRate, mVi.rate);
|
|
mMeta->setInt32(kKeyChannelCount, mVi.channels);
|
|
mMeta->setInt32(kKeyBitRate, mVi.bitrate_nominal);
|
|
|
|
ALOGV("lower-bitrate = %ld", mVi.bitrate_lower);
|
|
ALOGV("upper-bitrate = %ld", mVi.bitrate_upper);
|
|
ALOGV("nominal-bitrate = %ld", mVi.bitrate_nominal);
|
|
ALOGV("window-bitrate = %ld", mVi.bitrate_window);
|
|
ALOGV("blocksizes: %d/%d",
|
|
vorbis_info_blocksize(&mVi, 0),
|
|
vorbis_info_blocksize(&mVi, 1)
|
|
);
|
|
|
|
off64_t size;
|
|
if (mSource->getSize(&size) == OK) {
|
|
uint64_t bps = approxBitrate();
|
|
if (bps != 0) {
|
|
mMeta->setInt64(kKeyDuration, size * 8000000ll / bps);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case 3:
|
|
{
|
|
if (0 != _vorbis_unpack_comment(&mVc, &bits)) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
|
|
parseFileMetaData();
|
|
break;
|
|
}
|
|
|
|
case 5:
|
|
{
|
|
if (0 != _vorbis_unpack_books(&mVi, &bits)) {
|
|
return ERROR_MALFORMED;
|
|
}
|
|
|
|
mMeta->setData(kKeyVorbisBooks, 0, data, size);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
uint64_t MyVorbisExtractor::approxBitrate() const {
|
|
if (mVi.bitrate_nominal != 0) {
|
|
return mVi.bitrate_nominal;
|
|
}
|
|
|
|
return (mVi.bitrate_lower + mVi.bitrate_upper) / 2;
|
|
}
|
|
|
|
void MyOggExtractor::parseFileMetaData() {
|
|
mFileMeta = new MetaData;
|
|
mFileMeta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_CONTAINER_OGG);
|
|
|
|
for (int i = 0; i < mVc.comments; ++i) {
|
|
const char *comment = mVc.user_comments[i];
|
|
size_t commentLength = mVc.comment_lengths[i];
|
|
parseVorbisComment(mFileMeta, comment, commentLength);
|
|
//ALOGI("comment #%d: '%s'", i + 1, mVc.user_comments[i]);
|
|
}
|
|
}
|
|
|
|
void parseVorbisComment(
|
|
const sp<MetaData> &fileMeta, const char *comment, size_t commentLength)
|
|
{
|
|
struct {
|
|
const char *const mTag;
|
|
uint32_t mKey;
|
|
} kMap[] = {
|
|
{ "TITLE", kKeyTitle },
|
|
{ "ARTIST", kKeyArtist },
|
|
{ "ALBUMARTIST", kKeyAlbumArtist },
|
|
{ "ALBUM ARTIST", kKeyAlbumArtist },
|
|
{ "COMPILATION", kKeyCompilation },
|
|
{ "ALBUM", kKeyAlbum },
|
|
{ "COMPOSER", kKeyComposer },
|
|
{ "GENRE", kKeyGenre },
|
|
{ "AUTHOR", kKeyAuthor },
|
|
{ "TRACKNUMBER", kKeyCDTrackNumber },
|
|
{ "DISCNUMBER", kKeyDiscNumber },
|
|
{ "DATE", kKeyDate },
|
|
{ "YEAR", kKeyYear },
|
|
{ "LYRICIST", kKeyWriter },
|
|
{ "METADATA_BLOCK_PICTURE", kKeyAlbumArt },
|
|
{ "ANDROID_LOOP", kKeyAutoLoop },
|
|
};
|
|
|
|
for (size_t j = 0; j < sizeof(kMap) / sizeof(kMap[0]); ++j) {
|
|
size_t tagLen = strlen(kMap[j].mTag);
|
|
if (!strncasecmp(kMap[j].mTag, comment, tagLen)
|
|
&& comment[tagLen] == '=') {
|
|
if (kMap[j].mKey == kKeyAlbumArt) {
|
|
extractAlbumArt(
|
|
fileMeta,
|
|
&comment[tagLen + 1],
|
|
commentLength - tagLen - 1);
|
|
} else if (kMap[j].mKey == kKeyAutoLoop) {
|
|
if (!strcasecmp(&comment[tagLen + 1], "true")) {
|
|
fileMeta->setInt32(kKeyAutoLoop, true);
|
|
}
|
|
} else {
|
|
fileMeta->setCString(kMap[j].mKey, &comment[tagLen + 1]);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
static void extractAlbumArt(
|
|
const sp<MetaData> &fileMeta, const void *data, size_t size) {
|
|
ALOGV("extractAlbumArt from '%s'", (const char *)data);
|
|
|
|
sp<ABuffer> flacBuffer = decodeBase64(AString((const char *)data, size));
|
|
if (flacBuffer == NULL) {
|
|
ALOGE("malformed base64 encoded data.");
|
|
return;
|
|
}
|
|
|
|
size_t flacSize = flacBuffer->size();
|
|
uint8_t *flac = flacBuffer->data();
|
|
ALOGV("got flac of size %zu", flacSize);
|
|
|
|
uint32_t picType;
|
|
uint32_t typeLen;
|
|
uint32_t descLen;
|
|
uint32_t dataLen;
|
|
char type[128];
|
|
|
|
if (flacSize < 8) {
|
|
return;
|
|
}
|
|
|
|
picType = U32_AT(flac);
|
|
|
|
if (picType != 3) {
|
|
// This is not a front cover.
|
|
return;
|
|
}
|
|
|
|
typeLen = U32_AT(&flac[4]);
|
|
if (typeLen > sizeof(type) - 1) {
|
|
return;
|
|
}
|
|
|
|
// we've already checked above that flacSize >= 8
|
|
if (flacSize - 8 < typeLen) {
|
|
return;
|
|
}
|
|
|
|
memcpy(type, &flac[8], typeLen);
|
|
type[typeLen] = '\0';
|
|
|
|
ALOGV("picType = %d, type = '%s'", picType, type);
|
|
|
|
if (!strcmp(type, "-->")) {
|
|
// This is not inline cover art, but an external url instead.
|
|
return;
|
|
}
|
|
|
|
if (flacSize < 32 || flacSize - 32 < typeLen) {
|
|
return;
|
|
}
|
|
|
|
descLen = U32_AT(&flac[8 + typeLen]);
|
|
if (flacSize - 32 - typeLen < descLen) {
|
|
return;
|
|
}
|
|
|
|
dataLen = U32_AT(&flac[8 + typeLen + 4 + descLen + 16]);
|
|
|
|
// we've already checked above that (flacSize - 32 - typeLen - descLen) >= 0
|
|
if (flacSize - 32 - typeLen - descLen < dataLen) {
|
|
return;
|
|
}
|
|
|
|
ALOGV("got image data, %zu trailing bytes",
|
|
flacSize - 32 - typeLen - descLen - dataLen);
|
|
|
|
fileMeta->setData(
|
|
kKeyAlbumArt, 0, &flac[8 + typeLen + 4 + descLen + 20], dataLen);
|
|
|
|
fileMeta->setCString(kKeyAlbumArtMIME, type);
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
OggExtractor::OggExtractor(const sp<DataSource> &source)
|
|
: mDataSource(source),
|
|
mInitCheck(NO_INIT),
|
|
mImpl(NULL) {
|
|
for (int i = 0; i < 2; ++i) {
|
|
if (mImpl != NULL) {
|
|
delete mImpl;
|
|
}
|
|
if (i == 0) {
|
|
mImpl = new MyVorbisExtractor(mDataSource);
|
|
} else {
|
|
mImpl = new MyOpusExtractor(mDataSource);
|
|
}
|
|
mInitCheck = mImpl->seekToOffset(0);
|
|
|
|
if (mInitCheck == OK) {
|
|
mInitCheck = mImpl->init();
|
|
if (mInitCheck == OK) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
OggExtractor::~OggExtractor() {
|
|
delete mImpl;
|
|
mImpl = NULL;
|
|
}
|
|
|
|
size_t OggExtractor::countTracks() {
|
|
return mInitCheck != OK ? 0 : 1;
|
|
}
|
|
|
|
sp<IMediaSource> OggExtractor::getTrack(size_t index) {
|
|
if (index >= 1) {
|
|
return NULL;
|
|
}
|
|
|
|
return new OggSource(this);
|
|
}
|
|
|
|
sp<MetaData> OggExtractor::getTrackMetaData(
|
|
size_t index, uint32_t /* flags */) {
|
|
if (index >= 1) {
|
|
return NULL;
|
|
}
|
|
|
|
return mImpl->getFormat();
|
|
}
|
|
|
|
sp<MetaData> OggExtractor::getMetaData() {
|
|
return mImpl->getFileMetaData();
|
|
}
|
|
|
|
bool SniffOgg(
|
|
const sp<DataSource> &source, String8 *mimeType, float *confidence,
|
|
sp<AMessage> *) {
|
|
char tmp[4];
|
|
if (source->readAt(0, tmp, 4) < 4 || memcmp(tmp, "OggS", 4)) {
|
|
return false;
|
|
}
|
|
|
|
mimeType->setTo(MEDIA_MIMETYPE_CONTAINER_OGG);
|
|
*confidence = 0.2f;
|
|
|
|
return true;
|
|
}
|
|
|
|
} // namespace android
|