SampleIterator.cpp revision cbcd8dd1967af30ff035132328002c0ec9a8872e
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; 136170056540e9ce65261b45efd15f67e72e2df1bedRobert Shih if ((err = findSampleTimeAndDuration( 137170056540e9ce65261b45efd15f67e72e2df1bedRobert Shih sampleIndex, &mCurrentSampleTime, &mCurrentSampleDuration)) != OK) { 13829357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47Steve Block ALOGE("findSampleTime return error"); 139c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return err; 140c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 141c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 142c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mCurrentSampleIndex = sampleIndex; 143c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 144c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mInitialized = true; 145c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 146c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 147c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 148c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 149c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huberstatus_t SampleIterator::findChunkRange(uint32_t sampleIndex) { 150c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber CHECK(sampleIndex >= mFirstChunkSampleIndex); 151c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 152c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber while (sampleIndex >= mStopChunkSampleIndex) { 153c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mSampleToChunkIndex == mTable->mNumSampleToChunkOffsets) { 154c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 155c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 156c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 157c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunkSampleIndex = mStopChunkSampleIndex; 158c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 159c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber const SampleTable::SampleToChunkEntry *entry = 160c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &mTable->mSampleToChunkEntries[mSampleToChunkIndex]; 161c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 162c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunk = entry->startChunk; 163c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mSamplesPerChunk = entry->samplesPerChunk; 164c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mChunkDesc = entry->chunkDesc; 165c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 166c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mSampleToChunkIndex + 1 < mTable->mNumSampleToChunkOffsets) { 167c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunk = entry[1].startChunk; 168c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 169cbcd8dd1967af30ff035132328002c0ec9a8872eChad Brubaker if (mStopChunk < mFirstChunk || 170cbcd8dd1967af30ff035132328002c0ec9a8872eChad Brubaker (mStopChunk - mFirstChunk) > UINT32_MAX / mSamplesPerChunk || 171cbcd8dd1967af30ff035132328002c0ec9a8872eChad Brubaker ((mStopChunk - mFirstChunk) * mSamplesPerChunk > 172cbcd8dd1967af30ff035132328002c0ec9a8872eChad Brubaker UINT32_MAX - mFirstChunkSampleIndex)) { 173cbcd8dd1967af30ff035132328002c0ec9a8872eChad Brubaker 174cbcd8dd1967af30ff035132328002c0ec9a8872eChad Brubaker return ERROR_OUT_OF_RANGE; 175cbcd8dd1967af30ff035132328002c0ec9a8872eChad Brubaker } 176c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunkSampleIndex = 177c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mFirstChunkSampleIndex 178c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber + (mStopChunk - mFirstChunk) * mSamplesPerChunk; 179c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } else { 180c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunk = 0xffffffff; 181c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mStopChunkSampleIndex = 0xffffffff; 182c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 183c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 184c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber ++mSampleToChunkIndex; 185c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 186c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 187c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 188c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 189c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 190c7fc37a3dab9bd1f96713649f351b5990e6316ffJames Dongstatus_t SampleIterator::getChunkOffset(uint32_t chunk, off64_t *offset) { 191c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *offset = 0; 192c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 193c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (chunk >= mTable->mNumChunkOffsets) { 194c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 195c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 196c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 197c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mChunkOffsetType == SampleTable::kChunkOffsetType32) { 198c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t offset32; 199c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 200c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 201c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mChunkOffsetOffset + 8 + 4 * chunk, 202c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &offset32, 203c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber sizeof(offset32)) < (ssize_t)sizeof(offset32)) { 204c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 205c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 206c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 207c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *offset = ntohl(offset32); 208c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } else { 209c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber CHECK_EQ(mTable->mChunkOffsetType, SampleTable::kChunkOffsetType64); 210c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 211c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint64_t offset64; 212c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 213c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mChunkOffsetOffset + 8 + 8 * chunk, 214c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &offset64, 215c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber sizeof(offset64)) < (ssize_t)sizeof(offset64)) { 216c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 217c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 218c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 219c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *offset = ntoh64(offset64); 220c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 221c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 222c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 223c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 224c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 225c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huberstatus_t SampleIterator::getSampleSizeDirect( 226c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint32_t sampleIndex, size_t *size) { 227c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = 0; 228c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 229c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (sampleIndex >= mTable->mNumSampleSizes) { 230c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 231c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 232c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 233c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDefaultSampleSize > 0) { 234c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = mTable->mDefaultSampleSize; 235c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 236c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 237c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 238c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber switch (mTable->mSampleSizeFieldSize) { 239c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber case 32: 240c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 241c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 242c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + 4 * sampleIndex, 243c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber size, sizeof(*size)) < (ssize_t)sizeof(*size)) { 244c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 245c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 246c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 247c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = ntohl(*size); 248c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 249c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 250c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 251c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber case 16: 252c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 253c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint16_t x; 254c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 255c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + 2 * sampleIndex, 256c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &x, sizeof(x)) < (ssize_t)sizeof(x)) { 257c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 258c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 259c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 260c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = ntohs(x); 261c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 262c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 263c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 264c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber case 8: 265c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 266c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint8_t x; 267c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 268c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + sampleIndex, 269c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &x, sizeof(x)) < (ssize_t)sizeof(x)) { 270c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 271c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 272c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 273c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = x; 274c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 275c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 276c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 277c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber default: 278c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber { 279c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber CHECK_EQ(mTable->mSampleSizeFieldSize, 4); 280c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 281c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber uint8_t x; 282c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTable->mDataSource->readAt( 283c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTable->mSampleSizeOffset + 12 + sampleIndex / 2, 284c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber &x, sizeof(x)) < (ssize_t)sizeof(x)) { 285c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_IO; 286c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 287c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 288c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *size = (sampleIndex & 1) ? x & 0x0f : x >> 4; 289c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber break; 290c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 291c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 292c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 293c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 294c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 295c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 296170056540e9ce65261b45efd15f67e72e2df1bedRobert Shihstatus_t SampleIterator::findSampleTimeAndDuration( 297170056540e9ce65261b45efd15f67e72e2df1bedRobert Shih uint32_t sampleIndex, uint32_t *time, uint32_t *duration) { 298c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (sampleIndex >= mTable->mNumSampleSizes) { 299c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 300c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 301c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 302c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber while (sampleIndex >= mTTSSampleIndex + mTTSCount) { 303c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber if (mTimeToSampleIndex == mTable->mTimeToSampleCount) { 304c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return ERROR_OUT_OF_RANGE; 305c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 306c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 307c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleIndex += mTTSCount; 308c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSSampleTime += mTTSCount * mTTSDuration; 309c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 310c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSCount = mTable->mTimeToSample[2 * mTimeToSampleIndex]; 311c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber mTTSDuration = mTable->mTimeToSample[2 * mTimeToSampleIndex + 1]; 312c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 313c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber ++mTimeToSampleIndex; 314c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber } 315c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 316c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber *time = mTTSSampleTime + mTTSDuration * (sampleIndex - mTTSSampleIndex); 317c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 3184931bb5259d10c1fa01e7405fb7aaef58a8ffb22Andreas Huber *time += mTable->getCompositionTimeOffset(sampleIndex); 3194931bb5259d10c1fa01e7405fb7aaef58a8ffb22Andreas Huber 320170056540e9ce65261b45efd15f67e72e2df1bedRobert Shih *duration = mTTSDuration; 321170056540e9ce65261b45efd15f67e72e2df1bedRobert Shih 322c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber return OK; 323c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} 324c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 325c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber} // namespace android 326c57b67905c2128ddadfeca96785ee1f593b6605aAndreas Huber 327