/*
* 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 "OggExtractor"
#include <utils/Log.h>
#include "include/OggExtractor.h"
#include <cutils/properties.h>
#include <media/stagefright/foundation/ABuffer.h>
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/foundation/base64.h>
#include <media/stagefright/DataSource.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MediaBufferGroup.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>
extern "C" {
#include <Tremolo/codec_internal.h>
int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb);
int _vorbis_unpack_info(vorbis_info *vi,oggpack_buffer *opb);
int _vorbis_unpack_comment(vorbis_comment *vc,oggpack_buffer *opb);
long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op);
}
namespace android {
struct OggSource : public MediaSource {
OggSource(const sp<OggExtractor> &extractor);
virtual sp<MetaData> getFormat();
virtual status_t start(MetaData *params = NULL);
virtual status_t stop();
virtual status_t read(
MediaBuffer **buffer, const ReadOptions *options = NULL);
protected:
virtual ~OggSource();
private:
sp<OggExtractor> mExtractor;
bool mStarted;
OggSource(const OggSource &);
OggSource &operator=(const OggSource &);
};
struct MyOggExtractor {
MyOggExtractor(
const sp<DataSource> &source,
const char *mimeType,
size_t numHeaders,
int64_t seekPreRollUs);
virtual ~MyOggExtractor();
sp<MetaData> getFormat() const;
// Returns an approximate bitrate in bits per second.
virtual uint64_t approxBitrate() const = 0;
status_t seekToTime(int64_t timeUs);
status_t seekToOffset(off64_t offset);
virtual status_t readNextPacket(MediaBuffer **buffer) = 0;
status_t init();
sp<MetaData> getFileMetaData() { return mFileMeta; }
protected:
struct Page {
uint64_t mGranulePosition;
int32_t mPrevPacketSize;
uint64_t mPrevPacketPos;
uint32_t mSerialNo;
uint32_t mPageNo;
uint8_t mFlags;
uint8_t mNumSegments;
uint8_t mLace[255];
};
struct TOCEntry {
off64_t mPageOffset;
int64_t mTimeUs;
};
sp<DataSource> mSource;
off64_t mOffset;
Page mCurrentPage;
uint64_t mCurGranulePosition;
uint64_t mPrevGranulePosition;
size_t mCurrentPageSize;
bool mFirstPacketInPage;
uint64_t mCurrentPageSamples;
size_t mNextLaceIndex;
const char *mMimeType;
size_t mNumHeaders;
int64_t mSeekPreRollUs;
off64_t mFirstDataOffset;
vorbis_info mVi;
vorbis_comment mVc;
sp<MetaData> mMeta;
sp<MetaData> mFileMeta;
Vector<TOCEntry> mTableOfContents;
ssize_t readPage(off64_t offset, Page *page);
status_t findNextPage(off64_t startOffset, off64_t *pageOffset);
virtual int64_t getTimeUsOfGranule(uint64_t granulePos) const = 0;
// Extract codec format, metadata tags, and various codec specific data;
// the format and CSD's are required to setup the decoders for the enclosed media content.
//
// Valid values for `type` are:
// 1 - bitstream identification header
// 3 - comment header
// 5 - codec setup header (Vorbis only)
virtual status_t verifyHeader(MediaBuffer *buffer, uint8_t type) = 0;
// Read the next ogg packet from the underlying data source; optionally
// calculate the timestamp for the output packet whilst pretending
// that we are parsing an Ogg Vorbis stream.
//
// *buffer is NULL'ed out immediately upon entry, and if successful a new buffer is allocated;
// clients are responsible for releasing the original buffer.
status_t _readNextPacket(MediaBuffer **buffer, bool calcVorbisTimestamp);
int32_t getPacketBlockSize(MediaBuffer *buffer);
void parseFileMetaData();
status_t findPrevGranulePosition(off64_t pageOffset, uint64_t *granulePos);
void buildTableOfContents();
MyOggExtractor(const MyOggExtractor &);
MyOggExtractor &operator=(const MyOggExtractor &);
};
struct MyVorbisExtractor : public MyOggExtractor {
MyVorbisExtractor(const sp<DataSource> &source)
: MyOggExtractor(source,
MEDIA_MIMETYPE_AUDIO_VORBIS,
/* numHeaders */ 3,
/* seekPreRollUs */ 0) {
}
virtual uint64_t approxBitrate() const;
virtual status_t readNextPacket(MediaBuffer **buffer) {
return _readNextPacket(buffer, /* calcVorbisTimestamp = */ true);
}
protected:
virtual int64_t getTimeUsOfGranule(uint64_t granulePos) const {
return granulePos * 1000000ll / mVi.rate;
}
virtual status_t verifyHeader(MediaBuffer *buffer, uint8_t type);
};
struct MyOpusExtractor : public MyOggExtractor {
static const int32_t kOpusSampleRate = 48000;
static const int64_t kOpusSeekPreRollUs = 80000; // 80 ms
MyOpusExtractor(const sp<DataSource> &source)
: MyOggExtractor(source, MEDIA_MIMETYPE_AUDIO_OPUS, /*numHeaders*/ 2, kOpusSeekPreRollUs),
mChannelCount(0),
mCodecDelay(0),
mStartGranulePosition(-1) {
}
virtual uint64_t approxBitrate() const {
return 0;
}
virtual status_t readNextPacket(MediaBuffer **buffer);
protected:
virtual int64_t getTimeUsOfGranule(uint64_t granulePos) const;
virtual status_t verifyHeader(MediaBuffer *buffer, uint8_t type);
private:
status_t verifyOpusHeader(MediaBuffer *buffer);
status_t verifyOpusComments(MediaBuffer *buffer);
uint32_t getNumSamplesInPacket(MediaBuffer *buffer) const;
uint8_t mChannelCount;
uint16_t mCodecDelay;
int64_t mStartGranulePosition;
};
static void extractAlbumArt(
const sp<MetaData> &fileMeta, const void *data, size_t size);
////////////////////////////////////////////////////////////////////////////////
OggSource::OggSource(const sp<OggExtractor> &extractor)
: mExtractor(extractor),
mStarted(false) {
}
OggSource::~OggSource() {
if (mStarted) {
stop();
}
}
sp<MetaData> OggSource::getFormat() {
return mExtractor->mImpl->getFormat();
}
status_t OggSource::start(MetaData * /* params */) {
if (mStarted) {
return INVALID_OPERATION;
}
mStarted = true;
return OK;
}
status_t OggSource::stop() {
mStarted = false;
return OK;
}
status_t OggSource::read(
MediaBuffer **out, const ReadOptions *options) {
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode mode;
if (options && options->getSeekTo(&seekTimeUs, &mode)) {
status_t err = mExtractor->mImpl->seekToTime(seekTimeUs);
if (err != OK) {
return err;
}
}
MediaBuffer *packet;
status_t err = mExtractor->mImpl->readNextPacket(&packet);
if (err != OK) {
return err;
}
#if 0
int64_t timeUs;
if (packet->meta_data()->findInt64(kKeyTime, &timeUs)) {
ALOGI("found time = %lld us", timeUs);
} else {
ALOGI("NO time");
}
#endif
packet->meta_data()->setInt32(kKeyIsSyncFrame, 1);
*out = packet;
return OK;
}
////////////////////////////////////////////////////////////////////////////////
MyOggExtractor::MyOggExtractor(
const sp<DataSource> &source,
const char *mimeType,
size_t numHeaders,
int64_t seekPreRollUs)
: mSource(source),
mOffset(0),
mCurGranulePosition(0),
mPrevGranulePosition(0),
mCurrentPageSize(0),
mFirstPacketInPage(true),
mCurrentPageSamples(0),
mNextLaceIndex(0),
mMimeType(mimeType),
mNumHeaders(numHeaders),
mSeekPreRollUs(seekPreRollUs),
mFirstDataOffset(-1) {
mCurrentPage.mNumSegments = 0;
vorbis_info_init(&mVi);
vorbis_comment_init(&mVc);
}
MyOggExtractor::~MyOggExtractor() {
vorbis_comment_clear(&mVc);
vorbis_info_clear(&mVi);
}
sp<MetaData> MyOggExtractor::getFormat() const {
return mMeta;
}
status_t MyOggExtractor::findNextPage(
off64_t startOffset, off64_t *pageOffset) {
*pageOffset = startOffset;
for (;;) {
char signature[4];
ssize_t n = mSource->readAt(*pageOffset, &signature, 4);
if (n < 4) {
*pageOffset = 0;
return (n < 0) ? n : (status_t)ERROR_END_OF_STREAM;
}
if (!memcmp(signature, "OggS", 4)) {
if (*pageOffset > startOffset) {
ALOGV("skipped %lld bytes of junk to reach next frame",
(long long)(*pageOffset - startOffset));
}
return OK;
}
++*pageOffset;
}
}
// Given the offset of the "current" page, find the page immediately preceding
// it (if any) and return its granule position.
// To do this we back up from the "current" page's offset until we find any
// page preceding it and then scan forward to just before the current page.
status_t MyOggExtractor::findPrevGranulePosition(
off64_t pageOffset, uint64_t *granulePos) {
*granulePos = 0;
off64_t prevPageOffset = 0;
off64_t prevGuess = pageOffset;
for (;;) {
if (prevGuess >= 5000) {
prevGuess -= 5000;
} else {
prevGuess = 0;
}
ALOGV("backing up %lld bytes", (long long)(pageOffset - prevGuess));
status_t err = findNextPage(prevGuess, &prevPageOffset);
if (err == ERROR_END_OF_STREAM) {
// We are at the last page and didn't back off enough;
// back off 5000 bytes more and try again.
continue;
} else if (err != OK) {
return err;
}
if (prevPageOffset < pageOffset || prevGuess == 0) {
break;
}
}
if (prevPageOffset == pageOffset) {
// We did not find a page preceding this one.
return UNKNOWN_ERROR;
}
ALOGV("prevPageOffset at %lld, pageOffset at %lld",
(long long)prevPageOffset, (long long)pageOffset);
for (;;) {
Page prevPage;
ssize_t n = readPage(prevPageOffset, &prevPage);
if (n <= 0) {
return (status_t)n;
}
prevPageOffset += n;
if (prevPageOffset == pageOffset) {
*granulePos = prevPage.mGranulePosition;
return OK;
}
}
}
status_t MyOggExtractor::seekToTime(int64_t timeUs) {
timeUs -= mSeekPreRollUs;
if (timeUs < 0) {
timeUs = 0;
}
if (mTableOfContents.isEmpty()) {
// Perform approximate seeking based on avg. bitrate.
uint64_t bps = approxBitrate();
if (bps <= 0) {
return INVALID_OPERATION;
}
off64_t pos = timeUs * bps / 8000000ll;
ALOGV("seeking to offset %lld", (long long)pos);
return seekToOffset(pos);
}
size_t left = 0;
size_t right_plus_one = mTableOfContents.size();
while (left < right_plus_one) {
size_t center = left + (right_plus_one - left) / 2;
const TOCEntry &entry = mTableOfContents.itemAt(center);
if (timeUs < entry.mTimeUs) {
right_plus_one = center;
} else if (timeUs > entry.mTimeUs) {
left = center + 1;
} else {
left = center;
break;
}
}
if (left == mTableOfContents.size()) {
--left;
}
const TOCEntry &entry = mTableOfContents.itemAt(left);
ALOGV("seeking to entry %zu / %zu at offset %lld",
left, mTableOfContents.size(), (long long)entry.mPageOffset);
return seekToOffset(entry.mPageOffset);
}
status_t MyOggExtractor::seekToOffset(off64_t offset) {
if (mFirstDataOffset >= 0 && offset < mFirstDataOffset) {
// Once we know where the actual audio data starts (past the headers)
// don't ever seek to anywhere before that.
offset = mFirstDataOffset;
}
off64_t pageOffset;
status_t err = findNextPage(offset, &pageOffset);
if (err != OK) {
return err;
}
// We found the page we wanted to seek to, but we'll also need
// the page preceding it to determine how many valid samples are on
// this page.
findPrevGranulePosition(pageOffset, &mPrevGranulePosition);
mOffset = pageOffset;
mCurrentPageSize = 0;
mFirstPacketInPage = true;
mCurrentPageSamples = 0;
mCurrentPage.mNumSegments = 0;
mCurrentPage.mPrevPacketSize = -1;
mNextLaceIndex = 0;
// XXX what if new page continues packet from last???
return OK;
}
ssize_t MyOggExtractor::readPage(off64_t offset, Page *page) {
uint8_t header[27];
ssize_t n;
if ((n = mSource->readAt(offset, header, sizeof(header)))
< (ssize_t)sizeof(header)) {
ALOGV("failed to read %zu bytes at offset %#016llx, got %zd bytes",
sizeof(header), (long long)offset, n);
if (n < 0) {
return n;
} else if (n == 0) {
return ERROR_END_OF_STREAM;
} else {
return ERROR_IO;
}
}
if (memcmp(header, "OggS", 4)) {
return ERROR_MALFORMED;
}
if (header[4] != 0) {
// Wrong version.
return ERROR_UNSUPPORTED;
}
page->mFlags = header[5];
if (page->mFlags & ~7) {
// Only bits 0-2 are defined in version 0.
return ERROR_MALFORMED;
}
page->mGranulePosition = U64LE_AT(&header[6]);
#if 0
printf("granulePosition = %llu (0x%llx)\n",
page->mGranulePosition, page->mGranulePosition);
#endif
page->mSerialNo = U32LE_AT(&header[14]);
page->mPageNo = U32LE_AT(&header[18]);
page->mNumSegments = header[26];
if (mSource->readAt(
offset + sizeof(header), page->mLace, page->mNumSegments)
< (ssize_t)page->mNumSegments) {
return ERROR_IO;
}
size_t totalSize = 0;;
for (size_t i = 0; i < page->mNumSegments; ++i) {
totalSize += page->mLace[i];
}
#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();
}
MediaBuffer *tmp = new MediaBuffer(fullSize);
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) {
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;
}
mCurrentPageSamples =
mCurrentPage.mGranulePosition - mPrevGranulePosition;
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;
}
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 */ * 1000000000 / 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);
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;
}
descLen = U32_AT(&flac[8 + typeLen]);
if (flacSize < 32 ||
flacSize - 32 < typeLen ||
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<MediaSource> 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