367 lines
10 KiB
C++
367 lines
10 KiB
C++
/*
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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_TAG "SampleIterator"
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//#define LOG_NDEBUG 0
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#include <utils/Log.h>
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#include "SampleIterator.h"
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#include <arpa/inet.h>
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#include <media/stagefright/foundation/ADebug.h>
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#include <media/stagefright/foundation/ByteUtils.h>
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#include "SampleTable.h"
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namespace android {
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SampleIterator::SampleIterator(SampleTable *table)
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: mTable(table),
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mInitialized(false),
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mTimeToSampleIndex(0),
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mTTSSampleIndex(0),
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mTTSSampleTime(0),
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mTTSCount(0),
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mTTSDuration(0) {
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reset();
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}
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void SampleIterator::reset() {
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mSampleToChunkIndex = 0;
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mFirstChunk = 0;
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mFirstChunkSampleIndex = 0;
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mStopChunk = 0;
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mStopChunkSampleIndex = 0;
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mSamplesPerChunk = 0;
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mChunkDesc = 0;
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}
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status_t SampleIterator::seekTo(uint32_t sampleIndex) {
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ALOGV("seekTo(%d)", sampleIndex);
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if (sampleIndex >= mTable->mNumSampleSizes) {
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return ERROR_END_OF_STREAM;
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}
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if (mTable->mSampleToChunkOffset < 0
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|| mTable->mChunkOffsetOffset < 0
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|| mTable->mSampleSizeOffset < 0
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|| mTable->mTimeToSampleCount == 0) {
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return ERROR_MALFORMED;
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}
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if (mInitialized && mCurrentSampleIndex == sampleIndex) {
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return OK;
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}
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if (!mInitialized || sampleIndex < mFirstChunkSampleIndex) {
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reset();
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}
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if (sampleIndex >= mStopChunkSampleIndex) {
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status_t err;
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if ((err = findChunkRange(sampleIndex)) != OK) {
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ALOGE("findChunkRange failed");
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return err;
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}
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}
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CHECK(sampleIndex < mStopChunkSampleIndex);
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if (mSamplesPerChunk == 0) {
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ALOGE("b/22802344");
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return ERROR_MALFORMED;
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}
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uint32_t chunk =
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(sampleIndex - mFirstChunkSampleIndex) / mSamplesPerChunk
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+ mFirstChunk;
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if (!mInitialized || chunk != mCurrentChunkIndex) {
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status_t err;
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if ((err = getChunkOffset(chunk, &mCurrentChunkOffset)) != OK) {
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ALOGE("getChunkOffset return error");
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return err;
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}
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mCurrentChunkSampleSizes.clear();
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uint32_t firstChunkSampleIndex =
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mFirstChunkSampleIndex
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+ mSamplesPerChunk * (chunk - mFirstChunk);
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for (uint32_t i = 0; i < mSamplesPerChunk; ++i) {
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size_t sampleSize;
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if ((err = getSampleSizeDirect(
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firstChunkSampleIndex + i, &sampleSize)) != OK) {
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ALOGE("getSampleSizeDirect return error");
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// stsc sample count is not sync with stsz sample count
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if (err == ERROR_OUT_OF_RANGE) {
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ALOGW("stsc samples(%d) not sync with stsz samples(%d)", mSamplesPerChunk, i);
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mSamplesPerChunk = i;
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break;
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} else{
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mCurrentChunkSampleSizes.clear();
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return err;
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}
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}
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mCurrentChunkSampleSizes.push(sampleSize);
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}
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mCurrentChunkIndex = chunk;
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}
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uint32_t chunkRelativeSampleIndex =
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(sampleIndex - mFirstChunkSampleIndex) % mSamplesPerChunk;
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mCurrentSampleOffset = mCurrentChunkOffset;
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for (uint32_t i = 0; i < chunkRelativeSampleIndex; ++i) {
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mCurrentSampleOffset += mCurrentChunkSampleSizes[i];
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}
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mCurrentSampleSize = mCurrentChunkSampleSizes[chunkRelativeSampleIndex];
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if (sampleIndex < mTTSSampleIndex) {
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mTimeToSampleIndex = 0;
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mTTSSampleIndex = 0;
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mTTSSampleTime = 0;
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mTTSCount = 0;
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mTTSDuration = 0;
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}
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status_t err;
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if ((err = findSampleTimeAndDuration(
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sampleIndex, &mCurrentSampleTime, &mCurrentSampleDuration)) != OK) {
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ALOGE("findSampleTime return error");
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return err;
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}
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mCurrentSampleIndex = sampleIndex;
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mInitialized = true;
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return OK;
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}
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status_t SampleIterator::findChunkRange(uint32_t sampleIndex) {
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CHECK(sampleIndex >= mFirstChunkSampleIndex);
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while (sampleIndex >= mStopChunkSampleIndex) {
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if (mSampleToChunkIndex == mTable->mNumSampleToChunkOffsets) {
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return ERROR_OUT_OF_RANGE;
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}
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mFirstChunkSampleIndex = mStopChunkSampleIndex;
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const SampleTable::SampleToChunkEntry *entry =
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&mTable->mSampleToChunkEntries[mSampleToChunkIndex];
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mFirstChunk = entry->startChunk;
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mSamplesPerChunk = entry->samplesPerChunk;
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mChunkDesc = entry->chunkDesc;
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if (mSampleToChunkIndex + 1 < mTable->mNumSampleToChunkOffsets) {
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mStopChunk = entry[1].startChunk;
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if (mSamplesPerChunk == 0 || mStopChunk < mFirstChunk ||
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(mStopChunk - mFirstChunk) > UINT32_MAX / mSamplesPerChunk ||
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((mStopChunk - mFirstChunk) * mSamplesPerChunk >
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UINT32_MAX - mFirstChunkSampleIndex)) {
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return ERROR_OUT_OF_RANGE;
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}
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mStopChunkSampleIndex =
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mFirstChunkSampleIndex
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+ (mStopChunk - mFirstChunk) * mSamplesPerChunk;
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} else {
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mStopChunk = 0xffffffff;
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mStopChunkSampleIndex = 0xffffffff;
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}
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++mSampleToChunkIndex;
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}
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return OK;
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}
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status_t SampleIterator::getChunkOffset(uint32_t chunk, off64_t *offset) {
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*offset = 0;
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if (chunk >= mTable->mNumChunkOffsets) {
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return ERROR_OUT_OF_RANGE;
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}
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if (mTable->mChunkOffsetType == SampleTable::kChunkOffsetType32) {
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uint32_t offset32;
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if (mTable->mDataSource->readAt(
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mTable->mChunkOffsetOffset + 8 + 4 * chunk,
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&offset32,
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sizeof(offset32)) < (ssize_t)sizeof(offset32)) {
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return ERROR_IO;
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}
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*offset = ntohl(offset32);
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} else {
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CHECK_EQ(mTable->mChunkOffsetType, SampleTable::kChunkOffsetType64);
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uint64_t offset64;
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if (mTable->mDataSource->readAt(
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mTable->mChunkOffsetOffset + 8 + 8 * chunk,
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&offset64,
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sizeof(offset64)) < (ssize_t)sizeof(offset64)) {
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return ERROR_IO;
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}
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*offset = ntoh64(offset64);
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}
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return OK;
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}
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status_t SampleIterator::getSampleSizeDirect(
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uint32_t sampleIndex, size_t *size) {
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*size = 0;
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if (sampleIndex >= mTable->mNumSampleSizes) {
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return ERROR_OUT_OF_RANGE;
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}
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if (mTable->mDefaultSampleSize > 0) {
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*size = mTable->mDefaultSampleSize;
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return OK;
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}
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switch (mTable->mSampleSizeFieldSize) {
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case 32:
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{
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uint32_t x;
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if (mTable->mDataSource->readAt(
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mTable->mSampleSizeOffset + 12 + 4 * sampleIndex,
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&x, sizeof(x)) < (ssize_t)sizeof(x)) {
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return ERROR_IO;
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}
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*size = ntohl(x);
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break;
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}
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case 16:
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{
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uint16_t x;
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if (mTable->mDataSource->readAt(
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mTable->mSampleSizeOffset + 12 + 2 * sampleIndex,
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&x, sizeof(x)) < (ssize_t)sizeof(x)) {
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return ERROR_IO;
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}
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*size = ntohs(x);
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break;
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}
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case 8:
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{
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uint8_t x;
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if (mTable->mDataSource->readAt(
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mTable->mSampleSizeOffset + 12 + sampleIndex,
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&x, sizeof(x)) < (ssize_t)sizeof(x)) {
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return ERROR_IO;
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}
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*size = x;
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break;
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}
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default:
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{
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CHECK_EQ(mTable->mSampleSizeFieldSize, 4u);
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uint8_t x;
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if (mTable->mDataSource->readAt(
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mTable->mSampleSizeOffset + 12 + sampleIndex / 2,
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&x, sizeof(x)) < (ssize_t)sizeof(x)) {
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return ERROR_IO;
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}
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*size = (sampleIndex & 1) ? x & 0x0f : x >> 4;
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break;
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}
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}
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return OK;
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}
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status_t SampleIterator::findSampleTimeAndDuration(
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uint32_t sampleIndex, uint64_t *time, uint64_t *duration) {
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if (sampleIndex >= mTable->mNumSampleSizes) {
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return ERROR_OUT_OF_RANGE;
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}
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while (true) {
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if (mTTSSampleIndex > UINT32_MAX - mTTSCount) {
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return ERROR_OUT_OF_RANGE;
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}
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if(sampleIndex < mTTSSampleIndex + mTTSCount) {
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break;
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}
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if (mTimeToSampleIndex == mTable->mTimeToSampleCount ||
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(mTTSDuration != 0 && mTTSCount > UINT64_MAX / mTTSDuration) ||
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mTTSSampleTime > UINT64_MAX - (mTTSCount * mTTSDuration)) {
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return ERROR_OUT_OF_RANGE;
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}
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mTTSSampleIndex += mTTSCount;
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mTTSSampleTime += mTTSCount * mTTSDuration;
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mTTSCount = mTable->mTimeToSample[2 * mTimeToSampleIndex];
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mTTSDuration = mTable->mTimeToSample[2 * mTimeToSampleIndex + 1];
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++mTimeToSampleIndex;
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}
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// below is equivalent to:
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// *time = mTTSSampleTime + mTTSDuration * (sampleIndex - mTTSSampleIndex);
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uint64_t tmp;
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if (__builtin_sub_overflow(sampleIndex, mTTSSampleIndex, &tmp) ||
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__builtin_mul_overflow(mTTSDuration, tmp, &tmp) ||
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__builtin_add_overflow(mTTSSampleTime, tmp, &tmp)) {
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return ERROR_OUT_OF_RANGE;
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}
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*time = tmp;
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int32_t offset = mTable->getCompositionTimeOffset(sampleIndex);
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if ((offset < 0 && *time < (offset == INT32_MIN ?
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INT64_MAX : uint64_t(-offset))) ||
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(offset > 0 && *time > UINT64_MAX - offset)) {
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ALOGE("%llu + %d would overflow", (unsigned long long) *time, offset);
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return ERROR_OUT_OF_RANGE;
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}
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if (offset > 0) {
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*time += offset;
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} else {
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*time -= (offset == INT32_MIN ? INT64_MAX : (-offset));
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}
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*duration = mTTSDuration;
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return OK;
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}
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} // namespace android
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