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/*
* Copyright (C) 2009 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_TAG "SampleTable"
//#define LOG_NDEBUG 0
#include <utils/Log.h>
#include "include/SampleTable.h"
#include "include/SampleIterator.h"
#include <arpa/inet.h>
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/DataSource.h>
#include <media/stagefright/Utils.h>
namespace android {
// static
const uint32_t SampleTable::kChunkOffsetType32 = FOURCC('s', 't', 'c', 'o');
// static
const uint32_t SampleTable::kChunkOffsetType64 = FOURCC('c', 'o', '6', '4');
// static
const uint32_t SampleTable::kSampleSizeType32 = FOURCC('s', 't', 's', 'z');
// static
const uint32_t SampleTable::kSampleSizeTypeCompact = FOURCC('s', 't', 'z', '2');
////////////////////////////////////////////////////////////////////////////////
struct SampleTable::CompositionDeltaLookup {
CompositionDeltaLookup();
void setEntries(
const uint32_t *deltaEntries, size_t numDeltaEntries);
uint32_t getCompositionTimeOffset(uint32_t sampleIndex);
private:
Mutex mLock;
const uint32_t *mDeltaEntries;
size_t mNumDeltaEntries;
size_t mCurrentDeltaEntry;
size_t mCurrentEntrySampleIndex;
DISALLOW_EVIL_CONSTRUCTORS(CompositionDeltaLookup);
};
SampleTable::CompositionDeltaLookup::CompositionDeltaLookup()
: mDeltaEntries(NULL),
mNumDeltaEntries(0),
mCurrentDeltaEntry(0),
mCurrentEntrySampleIndex(0) {
}
void SampleTable::CompositionDeltaLookup::setEntries(
const uint32_t *deltaEntries, size_t numDeltaEntries) {
Mutex::Autolock autolock(mLock);
mDeltaEntries = deltaEntries;
mNumDeltaEntries = numDeltaEntries;
mCurrentDeltaEntry = 0;
mCurrentEntrySampleIndex = 0;
}
uint32_t SampleTable::CompositionDeltaLookup::getCompositionTimeOffset(
uint32_t sampleIndex) {
Mutex::Autolock autolock(mLock);
if (mDeltaEntries == NULL) {
return 0;
}
if (sampleIndex < mCurrentEntrySampleIndex) {
mCurrentDeltaEntry = 0;
mCurrentEntrySampleIndex = 0;
}
while (mCurrentDeltaEntry < mNumDeltaEntries) {
uint32_t sampleCount = mDeltaEntries[2 * mCurrentDeltaEntry];
if (sampleIndex < mCurrentEntrySampleIndex + sampleCount) {
return mDeltaEntries[2 * mCurrentDeltaEntry + 1];
}
mCurrentEntrySampleIndex += sampleCount;
++mCurrentDeltaEntry;
}
return 0;
}
////////////////////////////////////////////////////////////////////////////////
SampleTable::SampleTable(const sp<DataSource> &source)
: mDataSource(source),
mChunkOffsetOffset(-1),
mChunkOffsetType(0),
mNumChunkOffsets(0),
mSampleToChunkOffset(-1),
mNumSampleToChunkOffsets(0),
mSampleSizeOffset(-1),
mSampleSizeFieldSize(0),
mDefaultSampleSize(0),
mNumSampleSizes(0),
mTimeToSampleCount(0),
mTimeToSample(NULL),
mSampleTimeEntries(NULL),
mCompositionTimeDeltaEntries(NULL),
mNumCompositionTimeDeltaEntries(0),
mCompositionDeltaLookup(new CompositionDeltaLookup),
mSyncSampleOffset(-1),
mNumSyncSamples(0),
mSyncSamples(NULL),
mLastSyncSampleIndex(0),
mSampleToChunkEntries(NULL) {
mSampleIterator = new SampleIterator(this);
}
SampleTable::~SampleTable() {
delete[] mSampleToChunkEntries;
mSampleToChunkEntries = NULL;
delete[] mSyncSamples;
mSyncSamples = NULL;
delete mCompositionDeltaLookup;
mCompositionDeltaLookup = NULL;
delete[] mCompositionTimeDeltaEntries;
mCompositionTimeDeltaEntries = NULL;
delete[] mSampleTimeEntries;
mSampleTimeEntries = NULL;
delete[] mTimeToSample;
mTimeToSample = NULL;
delete mSampleIterator;
mSampleIterator = NULL;
}
bool SampleTable::isValid() const {
return mChunkOffsetOffset >= 0
&& mSampleToChunkOffset >= 0
&& mSampleSizeOffset >= 0
&& mTimeToSample != NULL;
}
status_t SampleTable::setChunkOffsetParams(
uint32_t type, off64_t data_offset, size_t data_size) {
if (mChunkOffsetOffset >= 0) {
return ERROR_MALFORMED;
}
CHECK(type == kChunkOffsetType32 || type == kChunkOffsetType64);
mChunkOffsetOffset = data_offset;
mChunkOffsetType = type;
if (data_size < 8) {
return ERROR_MALFORMED;
}
uint8_t header[8];
if (mDataSource->readAt(
data_offset, header, sizeof(header)) < (ssize_t)sizeof(header)) {
return ERROR_IO;
}
if (U32_AT(header) != 0) {
// Expected version = 0, flags = 0.
return ERROR_MALFORMED;
}
mNumChunkOffsets = U32_AT(&header[4]);
if (mChunkOffsetType == kChunkOffsetType32) {
if (data_size < 8 + mNumChunkOffsets * 4) {
return ERROR_MALFORMED;
}
} else {
if (data_size < 8 + mNumChunkOffsets * 8) {
return ERROR_MALFORMED;
}
}
return OK;
}
status_t SampleTable::setSampleToChunkParams(
off64_t data_offset, size_t data_size) {
if (mSampleToChunkOffset >= 0) {
return ERROR_MALFORMED;
}
mSampleToChunkOffset = data_offset;
if (data_size < 8) {
return ERROR_MALFORMED;
}
uint8_t header[8];
if (mDataSource->readAt(
data_offset, header, sizeof(header)) < (ssize_t)sizeof(header)) {
return ERROR_IO;
}
if (U32_AT(header) != 0) {
// Expected version = 0, flags = 0.
return ERROR_MALFORMED;
}
mNumSampleToChunkOffsets = U32_AT(&header[4]);
if (data_size < 8 + mNumSampleToChunkOffsets * 12) {
return ERROR_MALFORMED;
}
mSampleToChunkEntries =
new SampleToChunkEntry[mNumSampleToChunkOffsets];
for (uint32_t i = 0; i < mNumSampleToChunkOffsets; ++i) {
uint8_t buffer[12];
if (mDataSource->readAt(
mSampleToChunkOffset + 8 + i * 12, buffer, sizeof(buffer))
!= (ssize_t)sizeof(buffer)) {
return ERROR_IO;
}
CHECK(U32_AT(buffer) >= 1); // chunk index is 1 based in the spec.
// We want the chunk index to be 0-based.
mSampleToChunkEntries[i].startChunk = U32_AT(buffer) - 1;
mSampleToChunkEntries[i].samplesPerChunk = U32_AT(&buffer[4]);
mSampleToChunkEntries[i].chunkDesc = U32_AT(&buffer[8]);
}
return OK;
}
status_t SampleTable::setSampleSizeParams(
uint32_t type, off64_t data_offset, size_t data_size) {
if (mSampleSizeOffset >= 0) {
return ERROR_MALFORMED;
}
CHECK(type == kSampleSizeType32 || type == kSampleSizeTypeCompact);
mSampleSizeOffset = data_offset;
if (data_size < 12) {
return ERROR_MALFORMED;
}
uint8_t header[12];
if (mDataSource->readAt(
data_offset, header, sizeof(header)) < (ssize_t)sizeof(header)) {
return ERROR_IO;
}
if (U32_AT(header) != 0) {
// Expected version = 0, flags = 0.
return ERROR_MALFORMED;
}
mDefaultSampleSize = U32_AT(&header[4]);
mNumSampleSizes = U32_AT(&header[8]);
if (type == kSampleSizeType32) {
mSampleSizeFieldSize = 32;
if (mDefaultSampleSize != 0) {
return OK;
}
if (data_size < 12 + mNumSampleSizes * 4) {
return ERROR_MALFORMED;
}
} else {
if ((mDefaultSampleSize & 0xffffff00) != 0) {
// The high 24 bits are reserved and must be 0.
return ERROR_MALFORMED;
}
mSampleSizeFieldSize = mDefaultSampleSize & 0xff;
mDefaultSampleSize = 0;
if (mSampleSizeFieldSize != 4 && mSampleSizeFieldSize != 8
&& mSampleSizeFieldSize != 16) {
return ERROR_MALFORMED;
}
if (data_size < 12 + (mNumSampleSizes * mSampleSizeFieldSize + 4) / 8) {
return ERROR_MALFORMED;
}
}
return OK;
}
status_t SampleTable::setTimeToSampleParams(
off64_t data_offset, size_t data_size) {
if (mTimeToSample != NULL || data_size < 8) {
return ERROR_MALFORMED;
}
uint8_t header[8];
if (mDataSource->readAt(
data_offset, header, sizeof(header)) < (ssize_t)sizeof(header)) {
return ERROR_IO;
}
if (U32_AT(header) != 0) {
// Expected version = 0, flags = 0.
return ERROR_MALFORMED;
}
mTimeToSampleCount = U32_AT(&header[4]);
mTimeToSample = new uint32_t[mTimeToSampleCount * 2];
size_t size = sizeof(uint32_t) * mTimeToSampleCount * 2;
if (mDataSource->readAt(
data_offset + 8, mTimeToSample, size) < (ssize_t)size) {
return ERROR_IO;
}
for (uint32_t i = 0; i < mTimeToSampleCount * 2; ++i) {
mTimeToSample[i] = ntohl(mTimeToSample[i]);
}
return OK;
}
status_t SampleTable::setCompositionTimeToSampleParams(
off64_t data_offset, size_t data_size) {
ALOGI("There are reordered frames present.");
if (mCompositionTimeDeltaEntries != NULL || data_size < 8) {
return ERROR_MALFORMED;
}
uint8_t header[8];
if (mDataSource->readAt(
data_offset, header, sizeof(header))
< (ssize_t)sizeof(header)) {
return ERROR_IO;
}
if (U32_AT(header) != 0) {
// Expected version = 0, flags = 0.
return ERROR_MALFORMED;
}
size_t numEntries = U32_AT(&header[4]);
if (data_size != (numEntries + 1) * 8) {
return ERROR_MALFORMED;
}
mNumCompositionTimeDeltaEntries = numEntries;
mCompositionTimeDeltaEntries = new uint32_t[2 * numEntries];
if (mDataSource->readAt(
data_offset + 8, mCompositionTimeDeltaEntries, numEntries * 8)
< (ssize_t)numEntries * 8) {
delete[] mCompositionTimeDeltaEntries;
mCompositionTimeDeltaEntries = NULL;
return ERROR_IO;
}
for (size_t i = 0; i < 2 * numEntries; ++i) {
mCompositionTimeDeltaEntries[i] = ntohl(mCompositionTimeDeltaEntries[i]);
}
mCompositionDeltaLookup->setEntries(
mCompositionTimeDeltaEntries, mNumCompositionTimeDeltaEntries);
return OK;
}
status_t SampleTable::setSyncSampleParams(off64_t data_offset, size_t data_size) {
if (mSyncSampleOffset >= 0 || data_size < 8) {
return ERROR_MALFORMED;
}
mSyncSampleOffset = data_offset;
uint8_t header[8];
if (mDataSource->readAt(
data_offset, header, sizeof(header)) < (ssize_t)sizeof(header)) {
return ERROR_IO;
}
if (U32_AT(header) != 0) {
// Expected version = 0, flags = 0.
return ERROR_MALFORMED;
}
mNumSyncSamples = U32_AT(&header[4]);
if (mNumSyncSamples < 2) {
ALOGV("Table of sync samples is empty or has only a single entry!");
}
mSyncSamples = new uint32_t[mNumSyncSamples];
size_t size = mNumSyncSamples * sizeof(uint32_t);
if (mDataSource->readAt(mSyncSampleOffset + 8, mSyncSamples, size)
!= (ssize_t)size) {
return ERROR_IO;
}
for (size_t i = 0; i < mNumSyncSamples; ++i) {
mSyncSamples[i] = ntohl(mSyncSamples[i]) - 1;
}
return OK;
}
uint32_t SampleTable::countChunkOffsets() const {
return mNumChunkOffsets;
}
uint32_t SampleTable::countSamples() const {
return mNumSampleSizes;
}
status_t SampleTable::getMaxSampleSize(size_t *max_size) {
Mutex::Autolock autoLock(mLock);
*max_size = 0;
for (uint32_t i = 0; i < mNumSampleSizes; ++i) {
size_t sample_size;
status_t err = getSampleSize_l(i, &sample_size);
if (err != OK) {
return err;
}
if (sample_size > *max_size) {
*max_size = sample_size;
}
}
return OK;
}
uint32_t abs_difference(uint32_t time1, uint32_t time2) {
return time1 > time2 ? time1 - time2 : time2 - time1;
}
// static
int SampleTable::CompareIncreasingTime(const void *_a, const void *_b) {
const SampleTimeEntry *a = (const SampleTimeEntry *)_a;
const SampleTimeEntry *b = (const SampleTimeEntry *)_b;
if (a->mCompositionTime < b->mCompositionTime) {
return -1;
} else if (a->mCompositionTime > b->mCompositionTime) {
return 1;
}
return 0;
}
void SampleTable::buildSampleEntriesTable() {
Mutex::Autolock autoLock(mLock);
if (mSampleTimeEntries != NULL) {
return;
}
mSampleTimeEntries = new SampleTimeEntry[mNumSampleSizes];
uint32_t sampleIndex = 0;
uint32_t sampleTime = 0;
for (uint32_t i = 0; i < mTimeToSampleCount; ++i) {
uint32_t n = mTimeToSample[2 * i];
uint32_t delta = mTimeToSample[2 * i + 1];
for (uint32_t j = 0; j < n; ++j) {
if (sampleIndex < mNumSampleSizes) {
// Technically this should always be the case if the file
// is well-formed, but you know... there's (gasp) malformed
// content out there.
mSampleTimeEntries[sampleIndex].mSampleIndex = sampleIndex;
uint32_t compTimeDelta =
mCompositionDeltaLookup->getCompositionTimeOffset(
sampleIndex);
mSampleTimeEntries[sampleIndex].mCompositionTime =
sampleTime + compTimeDelta;
}
++sampleIndex;
sampleTime += delta;
}
}
qsort(mSampleTimeEntries, mNumSampleSizes, sizeof(SampleTimeEntry),
CompareIncreasingTime);
}
status_t SampleTable::findSampleAtTime(
uint32_t req_time, uint32_t *sample_index, uint32_t flags) {
buildSampleEntriesTable();
uint32_t left = 0;
uint32_t right = mNumSampleSizes;
while (left < right) {
uint32_t center = (left + right) / 2;
uint32_t centerTime = mSampleTimeEntries[center].mCompositionTime;
if (req_time < centerTime) {
right = center;
} else if (req_time > centerTime) {
left = center + 1;
} else {
left = center;
break;
}
}
if (left == mNumSampleSizes) {
if (flags == kFlagAfter) {
return ERROR_OUT_OF_RANGE;
}
--left;
}
uint32_t closestIndex = left;
switch (flags) {
case kFlagBefore:
{
while (closestIndex > 0
&& mSampleTimeEntries[closestIndex].mCompositionTime
> req_time) {
--closestIndex;
}
break;
}
case kFlagAfter:
{
while (closestIndex + 1 < mNumSampleSizes
&& mSampleTimeEntries[closestIndex].mCompositionTime
< req_time) {
++closestIndex;
}
break;
}
default:
{
CHECK(flags == kFlagClosest);
if (closestIndex > 0) {
// Check left neighbour and pick closest.
uint32_t absdiff1 =
abs_difference(
mSampleTimeEntries[closestIndex].mCompositionTime,
req_time);
uint32_t absdiff2 =
abs_difference(
mSampleTimeEntries[closestIndex - 1].mCompositionTime,
req_time);
if (absdiff1 > absdiff2) {
closestIndex = closestIndex - 1;
}
}
break;
}
}
*sample_index = mSampleTimeEntries[closestIndex].mSampleIndex;
return OK;
}
status_t SampleTable::findSyncSampleNear(
uint32_t start_sample_index, uint32_t *sample_index, uint32_t flags) {
Mutex::Autolock autoLock(mLock);
*sample_index = 0;
if (mSyncSampleOffset < 0) {
// All samples are sync-samples.
*sample_index = start_sample_index;
return OK;
}
if (mNumSyncSamples == 0) {
*sample_index = 0;
return OK;
}
uint32_t left = 0;
uint32_t right = mNumSyncSamples;
while (left < right) {
uint32_t center = left + (right - left) / 2;
uint32_t x = mSyncSamples[center];
if (start_sample_index < x) {
right = center;
} else if (start_sample_index > x) {
left = center + 1;
} else {
left = center;
break;
}
}
if (left == mNumSyncSamples) {
if (flags == kFlagAfter) {
ALOGE("tried to find a sync frame after the last one: %d", left);
return ERROR_OUT_OF_RANGE;
}
left = left - 1;
}
// Now ssi[left] is the sync sample index just before (or at)
// start_sample_index.
// Also start_sample_index < ssi[left + 1], if left + 1 < mNumSyncSamples.
uint32_t x = mSyncSamples[left];
if (left + 1 < mNumSyncSamples) {
uint32_t y = mSyncSamples[left + 1];
// our sample lies between sync samples x and y.
status_t err = mSampleIterator->seekTo(start_sample_index);
if (err != OK) {
return err;
}
uint32_t sample_time = mSampleIterator->getSampleTime();
err = mSampleIterator->seekTo(x);
if (err != OK) {
return err;
}
uint32_t x_time = mSampleIterator->getSampleTime();
err = mSampleIterator->seekTo(y);
if (err != OK) {
return err;
}
uint32_t y_time = mSampleIterator->getSampleTime();
if (abs_difference(x_time, sample_time)
> abs_difference(y_time, sample_time)) {
// Pick the sync sample closest (timewise) to the start-sample.
x = y;
++left;
}
}
switch (flags) {
case kFlagBefore:
{
if (x > start_sample_index) {
CHECK(left > 0);
x = mSyncSamples[left - 1];
if (x > start_sample_index) {
// The table of sync sample indices was not sorted
// properly.
return ERROR_MALFORMED;
}
}
break;
}
case kFlagAfter:
{
if (x < start_sample_index) {
if (left + 1 >= mNumSyncSamples) {
return ERROR_OUT_OF_RANGE;
}
x = mSyncSamples[left + 1];
if (x < start_sample_index) {
// The table of sync sample indices was not sorted
// properly.
return ERROR_MALFORMED;
}
}
break;
}
default:
break;
}
*sample_index = x;
return OK;
}
status_t SampleTable::findThumbnailSample(uint32_t *sample_index) {
Mutex::Autolock autoLock(mLock);
if (mSyncSampleOffset < 0) {
// All samples are sync-samples.
*sample_index = 0;
return OK;
}
uint32_t bestSampleIndex = 0;
size_t maxSampleSize = 0;
static const size_t kMaxNumSyncSamplesToScan = 20;
// Consider the first kMaxNumSyncSamplesToScan sync samples and
// pick the one with the largest (compressed) size as the thumbnail.
size_t numSamplesToScan = mNumSyncSamples;
if (numSamplesToScan > kMaxNumSyncSamplesToScan) {
numSamplesToScan = kMaxNumSyncSamplesToScan;
}
for (size_t i = 0; i < numSamplesToScan; ++i) {
uint32_t x = mSyncSamples[i];
// Now x is a sample index.
size_t sampleSize;
status_t err = getSampleSize_l(x, &sampleSize);
if (err != OK) {
return err;
}
if (i == 0 || sampleSize > maxSampleSize) {
bestSampleIndex = x;
maxSampleSize = sampleSize;
}
}
*sample_index = bestSampleIndex;
return OK;
}
status_t SampleTable::getSampleSize_l(
uint32_t sampleIndex, size_t *sampleSize) {
return mSampleIterator->getSampleSizeDirect(
sampleIndex, sampleSize);
}
status_t SampleTable::getMetaDataForSample(
uint32_t sampleIndex,
off64_t *offset,
size_t *size,
uint32_t *compositionTime,
bool *isSyncSample) {
Mutex::Autolock autoLock(mLock);
status_t err;
if ((err = mSampleIterator->seekTo(sampleIndex)) != OK) {
return err;
}
if (offset) {
*offset = mSampleIterator->getSampleOffset();
}
if (size) {
*size = mSampleIterator->getSampleSize();
}
if (compositionTime) {
*compositionTime = mSampleIterator->getSampleTime();
}
if (isSyncSample) {
*isSyncSample = false;
if (mSyncSampleOffset < 0) {
// Every sample is a sync sample.
*isSyncSample = true;
} else {
size_t i = (mLastSyncSampleIndex < mNumSyncSamples)
&& (mSyncSamples[mLastSyncSampleIndex] <= sampleIndex)
? mLastSyncSampleIndex : 0;
while (i < mNumSyncSamples && mSyncSamples[i] < sampleIndex) {
++i;
}
if (i < mNumSyncSamples && mSyncSamples[i] == sampleIndex) {
*isSyncSample = true;
}
mLastSyncSampleIndex = i;
}
}
return OK;
}
uint32_t SampleTable::getCompositionTimeOffset(uint32_t sampleIndex) {
return mCompositionDeltaLookup->getCompositionTimeOffset(sampleIndex);
}
} // namespace android