SampleIterator.cpp revision f1d5aa162c02a16b7195a43a9bcea4d592600ac4
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 87c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t chunk = 88c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber (sampleIndex - mFirstChunkSampleIndex) / mSamplesPerChunk 89c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber + mFirstChunk; 90c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 91c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (!mInitialized || chunk != mCurrentChunkIndex) { 92c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentChunkIndex = chunk; 93c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 94c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber status_t err; 95c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if ((err = getChunkOffset(chunk, &mCurrentChunkOffset)) != OK) { 9629357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47Steve Block ALOGE("getChunkOffset return error"); 97c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return err; 98c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 99c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 100c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentChunkSampleSizes.clear(); 101c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 102c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t firstChunkSampleIndex = 103c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunkSampleIndex 104c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber + mSamplesPerChunk * (mCurrentChunkIndex - mFirstChunk); 105c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 106c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber for (uint32_t i = 0; i < mSamplesPerChunk; ++i) { 107c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber size_t sampleSize; 108c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if ((err = getSampleSizeDirect( 109c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber firstChunkSampleIndex + i, &sampleSize)) != OK) { 11029357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47Steve Block ALOGE("getSampleSizeDirect return error"); 111c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return err; 112c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 113c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 114c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentChunkSampleSizes.push(sampleSize); 115c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 116c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 117c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 118c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t chunkRelativeSampleIndex = 119c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber (sampleIndex - mFirstChunkSampleIndex) % mSamplesPerChunk; 120c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 121c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentSampleOffset = mCurrentChunkOffset; 122c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber for (uint32_t i = 0; i < chunkRelativeSampleIndex; ++i) { 123c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentSampleOffset += mCurrentChunkSampleSizes[i]; 124c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 125c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 126c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentSampleSize = mCurrentChunkSampleSizes[chunkRelativeSampleIndex]; 127c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (sampleIndex < mTTSSampleIndex) { 128c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTimeToSampleIndex = 0; 129c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleIndex = 0; 130c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleTime = 0; 131c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSCount = 0; 132c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSDuration = 0; 133c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 134c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 135c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber status_t err; 136c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if ((err = findSampleTime(sampleIndex, &mCurrentSampleTime)) != OK) { 13729357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47Steve Block ALOGE("findSampleTime return error"); 138c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return err; 139c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 140c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 141c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentSampleIndex = sampleIndex; 142c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 143c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mInitialized = true; 144c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 145c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 146c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 147c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 148c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huberstatus_t SampleIterator::findChunkRange(uint32_t sampleIndex) { 149c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber CHECK(sampleIndex >= mFirstChunkSampleIndex); 150c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 151c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber while (sampleIndex >= mStopChunkSampleIndex) { 152c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mSampleToChunkIndex == mTable->mNumSampleToChunkOffsets) { 153c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 154c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 155c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 156c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunkSampleIndex = mStopChunkSampleIndex; 157c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 158c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber const SampleTable::SampleToChunkEntry *entry = 159c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &mTable->mSampleToChunkEntries[mSampleToChunkIndex]; 160c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 161c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunk = entry->startChunk; 162c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mSamplesPerChunk = entry->samplesPerChunk; 163c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mChunkDesc = entry->chunkDesc; 164c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 165c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mSampleToChunkIndex + 1 < mTable->mNumSampleToChunkOffsets) { 166c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunk = entry[1].startChunk; 167c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 168c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunkSampleIndex = 169c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunkSampleIndex 170c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber + (mStopChunk - mFirstChunk) * mSamplesPerChunk; 171c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } else { 172c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunk = 0xffffffff; 173c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunkSampleIndex = 0xffffffff; 174c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 175c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 176c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber ++mSampleToChunkIndex; 177c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 178c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 179c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 180c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 181c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 182c7fc37a3dab9bd1f96713649f351b5990e6316ffJames Dongstatus_t SampleIterator::getChunkOffset(uint32_t chunk, off64_t *offset) { 183c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *offset = 0; 184c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 185c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (chunk >= mTable->mNumChunkOffsets) { 186c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 187c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 188c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 189c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mChunkOffsetType == SampleTable::kChunkOffsetType32) { 190c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t offset32; 191c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 192c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 193c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mChunkOffsetOffset + 8 + 4 * chunk, 194c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &offset32, 195c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber sizeof(offset32)) < (ssize_t)sizeof(offset32)) { 196c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 197c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 198c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 199c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *offset = ntohl(offset32); 200c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } else { 201c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber CHECK_EQ(mTable->mChunkOffsetType, SampleTable::kChunkOffsetType64); 202c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 203c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint64_t offset64; 204c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 205c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mChunkOffsetOffset + 8 + 8 * chunk, 206c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &offset64, 207c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber sizeof(offset64)) < (ssize_t)sizeof(offset64)) { 208c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 209c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 210c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 211c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *offset = ntoh64(offset64); 212c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 213c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 214c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 215c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 216c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 217c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huberstatus_t SampleIterator::getSampleSizeDirect( 218c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t sampleIndex, size_t *size) { 219c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = 0; 220c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 221c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (sampleIndex >= mTable->mNumSampleSizes) { 222c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 223c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 224c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 225c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDefaultSampleSize > 0) { 226c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = mTable->mDefaultSampleSize; 227c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 228c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 229c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 230c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber switch (mTable->mSampleSizeFieldSize) { 231c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber case 32: 232c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 233c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 234c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + 4 * sampleIndex, 235c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber size, sizeof(*size)) < (ssize_t)sizeof(*size)) { 236c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 237c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 238c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 239c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = ntohl(*size); 240c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 241c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 242c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 243c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber case 16: 244c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 245c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint16_t x; 246c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 247c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + 2 * sampleIndex, 248c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &x, sizeof(x)) < (ssize_t)sizeof(x)) { 249c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 250c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 251c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 252c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = ntohs(x); 253c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 254c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 255c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 256c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber case 8: 257c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 258c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint8_t x; 259c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 260c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + sampleIndex, 261c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &x, sizeof(x)) < (ssize_t)sizeof(x)) { 262c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 263c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 264c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 265c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = x; 266c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 267c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 268c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 269c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber default: 270c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 271c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber CHECK_EQ(mTable->mSampleSizeFieldSize, 4); 272c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 273c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint8_t x; 274c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 275c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + sampleIndex / 2, 276c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &x, sizeof(x)) < (ssize_t)sizeof(x)) { 277c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 278c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 279c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 280c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = (sampleIndex & 1) ? x & 0x0f : x >> 4; 281c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 282c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 283c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 284c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 285c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 286c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 287c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 288c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huberstatus_t SampleIterator::findSampleTime( 289c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t sampleIndex, uint32_t *time) { 290c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (sampleIndex >= mTable->mNumSampleSizes) { 291c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 292c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 293c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 294c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber while (sampleIndex >= mTTSSampleIndex + mTTSCount) { 295c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTimeToSampleIndex == mTable->mTimeToSampleCount) { 296c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 297c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 298c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 299c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleIndex += mTTSCount; 300c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleTime += mTTSCount * mTTSDuration; 301c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 302c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSCount = mTable->mTimeToSample[2 * mTimeToSampleIndex]; 303c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSDuration = mTable->mTimeToSample[2 * mTimeToSampleIndex + 1]; 304c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 305c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber ++mTimeToSampleIndex; 306c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 307c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 308c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *time = mTTSSampleTime + mTTSDuration * (sampleIndex - mTTSSampleIndex); 309c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 3104931bb5259d10c1fa01e7405fb7aaef58a8ffb22Andreas Huber *time += mTable->getCompositionTimeOffset(sampleIndex); 3114931bb5259d10c1fa01e7405fb7aaef58a8ffb22Andreas Huber 312c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 313c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 314c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 315c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} // namespace android 316c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 317