SampleIterator.cpp revision 0386c91b8a910a134e5898ffa924c1b6c7560b13
1c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber/* 2c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * Copyright (C) 2010 The Android Open Source Project 3c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * 4c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 5c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * you may not use this file except in compliance with the License. 6c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * You may obtain a copy of the License at 7c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * 8c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * http://www.apache.org/licenses/LICENSE-2.0 9c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * 10c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * Unless required by applicable law or agreed to in writing, software 11c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 12c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * See the License for the specific language governing permissions and 14c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber * limitations under the License. 15c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber */ 16c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 17c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber#define LOG_TAG "SampleIterator" 18c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber//#define LOG_NDEBUG 0 19c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber#include <utils/Log.h> 20c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 21c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber#include "include/SampleIterator.h" 22c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 23c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber#include <arpa/inet.h> 24c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 25f1d5aa162c02a16b7195a43a9bcea4d592600ac4James Dong#include <media/stagefright/foundation/ADebug.h> 26c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber#include <media/stagefright/DataSource.h> 27c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber#include <media/stagefright/Utils.h> 28c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 29c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber#include "include/SampleTable.h" 30c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 31c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Hubernamespace android { 32c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 33c57b67905c2128ddadfeca96785ee1f593b6605aAndreas HuberSampleIterator::SampleIterator(SampleTable *table) 34c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber : mTable(table), 35c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mInitialized(false), 36c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTimeToSampleIndex(0), 37c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleIndex(0), 38c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleTime(0), 39c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSCount(0), 40c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSDuration(0) { 41c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber reset(); 42c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 43c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 44c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Hubervoid SampleIterator::reset() { 45c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mSampleToChunkIndex = 0; 46c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunk = 0; 47c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunkSampleIndex = 0; 48c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunk = 0; 49c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunkSampleIndex = 0; 50c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mSamplesPerChunk = 0; 51c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mChunkDesc = 0; 52c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 53c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 54c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huberstatus_t SampleIterator::seekTo(uint32_t sampleIndex) { 553856b090cd04ba5dd4a59a12430ed724d5995909Steve Block ALOGV("seekTo(%d)", sampleIndex); 56c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 57213addfaf4b359c69da4e9b4490c511d116845bbAndreas Huber if (sampleIndex >= mTable->mNumSampleSizes) { 58213addfaf4b359c69da4e9b4490c511d116845bbAndreas Huber return ERROR_END_OF_STREAM; 59213addfaf4b359c69da4e9b4490c511d116845bbAndreas Huber } 60213addfaf4b359c69da4e9b4490c511d116845bbAndreas Huber 61c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mSampleToChunkOffset < 0 62c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber || mTable->mChunkOffsetOffset < 0 63c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber || mTable->mSampleSizeOffset < 0 64c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber || mTable->mTimeToSampleCount == 0) { 65c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 66c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_MALFORMED; 67c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 68c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 69c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mInitialized && mCurrentSampleIndex == sampleIndex) { 70c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 71c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 72c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 73c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (!mInitialized || sampleIndex < mFirstChunkSampleIndex) { 74c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber reset(); 75c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 76c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 77c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (sampleIndex >= mStopChunkSampleIndex) { 78c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber status_t err; 79c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if ((err = findChunkRange(sampleIndex)) != OK) { 8029357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47Steve Block ALOGE("findChunkRange failed"); 81c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return err; 82c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 83c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 84c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 85c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber CHECK(sampleIndex < mStopChunkSampleIndex); 86c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 870386c91b8a910a134e5898ffa924c1b6c7560b13Wei Jia if (mSamplesPerChunk == 0) { 880386c91b8a910a134e5898ffa924c1b6c7560b13Wei Jia ALOGE("b/22802344"); 890386c91b8a910a134e5898ffa924c1b6c7560b13Wei Jia return ERROR_MALFORMED; 900386c91b8a910a134e5898ffa924c1b6c7560b13Wei Jia } 910386c91b8a910a134e5898ffa924c1b6c7560b13Wei Jia 92c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t chunk = 93c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber (sampleIndex - mFirstChunkSampleIndex) / mSamplesPerChunk 94c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber + mFirstChunk; 95c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 96c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (!mInitialized || chunk != mCurrentChunkIndex) { 97c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentChunkIndex = chunk; 98c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 99c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber status_t err; 100c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if ((err = getChunkOffset(chunk, &mCurrentChunkOffset)) != OK) { 10129357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47Steve Block ALOGE("getChunkOffset return error"); 102c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return err; 103c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 104c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 105c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentChunkSampleSizes.clear(); 106c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 107c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t firstChunkSampleIndex = 108c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunkSampleIndex 109c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber + mSamplesPerChunk * (mCurrentChunkIndex - mFirstChunk); 110c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 111c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber for (uint32_t i = 0; i < mSamplesPerChunk; ++i) { 112c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber size_t sampleSize; 113c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if ((err = getSampleSizeDirect( 114c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber firstChunkSampleIndex + i, &sampleSize)) != OK) { 11529357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47Steve Block ALOGE("getSampleSizeDirect return error"); 116c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return err; 117c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 118c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 119c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentChunkSampleSizes.push(sampleSize); 120c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 121c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 122c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 123c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t chunkRelativeSampleIndex = 124c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber (sampleIndex - mFirstChunkSampleIndex) % mSamplesPerChunk; 125c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 126c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentSampleOffset = mCurrentChunkOffset; 127c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber for (uint32_t i = 0; i < chunkRelativeSampleIndex; ++i) { 128c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentSampleOffset += mCurrentChunkSampleSizes[i]; 129c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 130c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 131c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentSampleSize = mCurrentChunkSampleSizes[chunkRelativeSampleIndex]; 132c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (sampleIndex < mTTSSampleIndex) { 133c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTimeToSampleIndex = 0; 134c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleIndex = 0; 135c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleTime = 0; 136c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSCount = 0; 137c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSDuration = 0; 138c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 139c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 140c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber status_t err; 141170056540e9ce65261b45efd15f67e72e2df1bedRobert Shih if ((err = findSampleTimeAndDuration( 142170056540e9ce65261b45efd15f67e72e2df1bedRobert Shih sampleIndex, &mCurrentSampleTime, &mCurrentSampleDuration)) != OK) { 14329357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47Steve Block ALOGE("findSampleTime return error"); 144c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return err; 145c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 146c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 147c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentSampleIndex = sampleIndex; 148c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 149c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mInitialized = true; 150c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 151c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 152c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 153c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 154c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huberstatus_t SampleIterator::findChunkRange(uint32_t sampleIndex) { 155c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber CHECK(sampleIndex >= mFirstChunkSampleIndex); 156c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 157c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber while (sampleIndex >= mStopChunkSampleIndex) { 158c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mSampleToChunkIndex == mTable->mNumSampleToChunkOffsets) { 159c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 160c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 161c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 162c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunkSampleIndex = mStopChunkSampleIndex; 163c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 164c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber const SampleTable::SampleToChunkEntry *entry = 165c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &mTable->mSampleToChunkEntries[mSampleToChunkIndex]; 166c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 167c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunk = entry->startChunk; 168c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mSamplesPerChunk = entry->samplesPerChunk; 169c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mChunkDesc = entry->chunkDesc; 170c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 171c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mSampleToChunkIndex + 1 < mTable->mNumSampleToChunkOffsets) { 172c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunk = entry[1].startChunk; 173c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 174c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunkSampleIndex = 175c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunkSampleIndex 176c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber + (mStopChunk - mFirstChunk) * mSamplesPerChunk; 177c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } else { 178c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunk = 0xffffffff; 179c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunkSampleIndex = 0xffffffff; 180c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 181c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 182c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber ++mSampleToChunkIndex; 183c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 184c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 185c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 186c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 187c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 188c7fc37a3dab9bd1f96713649f351b5990e6316ffJames Dongstatus_t SampleIterator::getChunkOffset(uint32_t chunk, off64_t *offset) { 189c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *offset = 0; 190c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 191c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (chunk >= mTable->mNumChunkOffsets) { 192c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 193c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 194c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 195c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mChunkOffsetType == SampleTable::kChunkOffsetType32) { 196c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t offset32; 197c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 198c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 199c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mChunkOffsetOffset + 8 + 4 * chunk, 200c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &offset32, 201c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber sizeof(offset32)) < (ssize_t)sizeof(offset32)) { 202c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 203c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 204c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 205c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *offset = ntohl(offset32); 206c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } else { 207c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber CHECK_EQ(mTable->mChunkOffsetType, SampleTable::kChunkOffsetType64); 208c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 209c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint64_t offset64; 210c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 211c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mChunkOffsetOffset + 8 + 8 * chunk, 212c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &offset64, 213c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber sizeof(offset64)) < (ssize_t)sizeof(offset64)) { 214c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 215c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 216c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 217c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *offset = ntoh64(offset64); 218c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 219c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 220c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 221c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 222c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 223c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huberstatus_t SampleIterator::getSampleSizeDirect( 224c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t sampleIndex, size_t *size) { 225c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = 0; 226c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 227c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (sampleIndex >= mTable->mNumSampleSizes) { 228c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 229c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 230c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 231c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDefaultSampleSize > 0) { 232c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = mTable->mDefaultSampleSize; 233c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 234c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 235c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 236c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber switch (mTable->mSampleSizeFieldSize) { 237c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber case 32: 238c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 239c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 240c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + 4 * sampleIndex, 241c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber size, sizeof(*size)) < (ssize_t)sizeof(*size)) { 242c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 243c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 244c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 245c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = ntohl(*size); 246c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 247c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 248c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 249c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber case 16: 250c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 251c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint16_t x; 252c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 253c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + 2 * sampleIndex, 254c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &x, sizeof(x)) < (ssize_t)sizeof(x)) { 255c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 256c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 257c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 258c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = ntohs(x); 259c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 260c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 261c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 262c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber case 8: 263c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 264c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint8_t x; 265c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 266c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + sampleIndex, 267c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &x, sizeof(x)) < (ssize_t)sizeof(x)) { 268c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 269c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 270c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 271c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = x; 272c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 273c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 274c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 275c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber default: 276c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 277c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber CHECK_EQ(mTable->mSampleSizeFieldSize, 4); 278c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 279c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint8_t x; 280c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 281c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + sampleIndex / 2, 282c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &x, sizeof(x)) < (ssize_t)sizeof(x)) { 283c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 284c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 285c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 286c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = (sampleIndex & 1) ? x & 0x0f : x >> 4; 287c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 288c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 289c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 290c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 291c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 292c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 293c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 294170056540e9ce65261b45efd15f67e72e2df1bedRobert Shihstatus_t SampleIterator::findSampleTimeAndDuration( 295170056540e9ce65261b45efd15f67e72e2df1bedRobert Shih uint32_t sampleIndex, uint32_t *time, uint32_t *duration) { 296c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (sampleIndex >= mTable->mNumSampleSizes) { 297c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 298c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 299c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 300c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber while (sampleIndex >= mTTSSampleIndex + mTTSCount) { 301c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTimeToSampleIndex == mTable->mTimeToSampleCount) { 302c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 303c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 304c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 305c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleIndex += mTTSCount; 306c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleTime += mTTSCount * mTTSDuration; 307c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 308c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSCount = mTable->mTimeToSample[2 * mTimeToSampleIndex]; 309c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSDuration = mTable->mTimeToSample[2 * mTimeToSampleIndex + 1]; 310c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 311c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber ++mTimeToSampleIndex; 312c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 313c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 314c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *time = mTTSSampleTime + mTTSDuration * (sampleIndex - mTTSSampleIndex); 315c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 3164931bb5259d10c1fa01e7405fb7aaef58a8ffb22Andreas Huber *time += mTable->getCompositionTimeOffset(sampleIndex); 3174931bb5259d10c1fa01e7405fb7aaef58a8ffb22Andreas Huber 318170056540e9ce65261b45efd15f67e72e2df1bedRobert Shih *duration = mTTSDuration; 319170056540e9ce65261b45efd15f67e72e2df1bedRobert Shih 320c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 321c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 322c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 323c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} // namespace android 324c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 325