1a64c8c79af1a15911c55306d83a797fa50969f77niko/* 2a64c8c79af1a15911c55306d83a797fa50969f77niko * Copyright (C) 2009 The Android Open Source Project 3a64c8c79af1a15911c55306d83a797fa50969f77niko * 4a64c8c79af1a15911c55306d83a797fa50969f77niko * Licensed under the Apache License, Version 2.0 (the "License"); 5a64c8c79af1a15911c55306d83a797fa50969f77niko * you may not use this file except in compliance with the License. 6a64c8c79af1a15911c55306d83a797fa50969f77niko * You may obtain a copy of the License at 7a64c8c79af1a15911c55306d83a797fa50969f77niko * 8a64c8c79af1a15911c55306d83a797fa50969f77niko * http://www.apache.org/licenses/LICENSE-2.0 9a64c8c79af1a15911c55306d83a797fa50969f77niko * 10a64c8c79af1a15911c55306d83a797fa50969f77niko * Unless required by applicable law or agreed to in writing, software 11a64c8c79af1a15911c55306d83a797fa50969f77niko * distributed under the License is distributed on an "AS IS" BASIS, 12a64c8c79af1a15911c55306d83a797fa50969f77niko * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13a64c8c79af1a15911c55306d83a797fa50969f77niko * See the License for the specific language governing permissions and 14a64c8c79af1a15911c55306d83a797fa50969f77niko * limitations under the License. 15a64c8c79af1a15911c55306d83a797fa50969f77niko */ 16a64c8c79af1a15911c55306d83a797fa50969f77niko 17a64c8c79af1a15911c55306d83a797fa50969f77niko//#define LOG_NDEBUG 0 18a64c8c79af1a15911c55306d83a797fa50969f77niko#define LOG_TAG "Metadata" 19a64c8c79af1a15911c55306d83a797fa50969f77niko#include <utils/Log.h> 20a64c8c79af1a15911c55306d83a797fa50969f77niko 21a64c8c79af1a15911c55306d83a797fa50969f77niko#include <sys/types.h> 22a64c8c79af1a15911c55306d83a797fa50969f77niko#include <media/Metadata.h> 23a64c8c79af1a15911c55306d83a797fa50969f77niko#include <binder/Parcel.h> 24a64c8c79af1a15911c55306d83a797fa50969f77niko#include <utils/Errors.h> 25a64c8c79af1a15911c55306d83a797fa50969f77niko#include <utils/RefBase.h> 26a64c8c79af1a15911c55306d83a797fa50969f77niko 27a64c8c79af1a15911c55306d83a797fa50969f77niko// This file contains code to serialize Metadata triples (key, type, 28a64c8c79af1a15911c55306d83a797fa50969f77niko// value) into a parcel. The Parcel is destinated to be decoded by the 29a64c8c79af1a15911c55306d83a797fa50969f77niko// Metadata.java class. 30a64c8c79af1a15911c55306d83a797fa50969f77niko 31a64c8c79af1a15911c55306d83a797fa50969f77nikonamespace { 32a64c8c79af1a15911c55306d83a797fa50969f77niko// All these constants below must be kept in sync with Metadata.java. 33a64c8c79af1a15911c55306d83a797fa50969f77nikoenum MetadataId { 34a64c8c79af1a15911c55306d83a797fa50969f77niko FIRST_SYSTEM_ID = 1, 358e51d58fca9b7669f271378f9245e180f4360cbcGloria Wang LAST_SYSTEM_ID = 31, 36a64c8c79af1a15911c55306d83a797fa50969f77niko FIRST_CUSTOM_ID = 8192 37a64c8c79af1a15911c55306d83a797fa50969f77niko}; 38a64c8c79af1a15911c55306d83a797fa50969f77niko 39a64c8c79af1a15911c55306d83a797fa50969f77niko// Types 40a64c8c79af1a15911c55306d83a797fa50969f77nikoenum Types { 41a64c8c79af1a15911c55306d83a797fa50969f77niko STRING_VAL = 1, 42a64c8c79af1a15911c55306d83a797fa50969f77niko INTEGER_VAL, 43a64c8c79af1a15911c55306d83a797fa50969f77niko BOOLEAN_VAL, 44a64c8c79af1a15911c55306d83a797fa50969f77niko LONG_VAL, 45a64c8c79af1a15911c55306d83a797fa50969f77niko DOUBLE_VAL, 46a64c8c79af1a15911c55306d83a797fa50969f77niko DATE_VAL, 47a64c8c79af1a15911c55306d83a797fa50969f77niko BYTE_ARRAY_VAL, 48a64c8c79af1a15911c55306d83a797fa50969f77niko}; 49a64c8c79af1a15911c55306d83a797fa50969f77niko 50a64c8c79af1a15911c55306d83a797fa50969f77nikoconst size_t kRecordHeaderSize = 3 * sizeof(int32_t); 51a64c8c79af1a15911c55306d83a797fa50969f77nikoconst int32_t kMetaMarker = 0x4d455441; // 'M' 'E' 'T' 'A' 52a64c8c79af1a15911c55306d83a797fa50969f77niko 53a64c8c79af1a15911c55306d83a797fa50969f77niko} // anonymous namespace 54a64c8c79af1a15911c55306d83a797fa50969f77niko 55a64c8c79af1a15911c55306d83a797fa50969f77nikonamespace android { 56a64c8c79af1a15911c55306d83a797fa50969f77nikonamespace media { 57a64c8c79af1a15911c55306d83a797fa50969f77niko 58a64c8c79af1a15911c55306d83a797fa50969f77nikoMetadata::Metadata(Parcel *p) 59a64c8c79af1a15911c55306d83a797fa50969f77niko :mData(p), 60e53b9ead781c36e96d6b6f012ddffc93a3d80f0dGlenn Kasten mBegin(p->dataPosition()) { } 61a64c8c79af1a15911c55306d83a797fa50969f77niko 62a64c8c79af1a15911c55306d83a797fa50969f77nikoMetadata::~Metadata() { } 63a64c8c79af1a15911c55306d83a797fa50969f77niko 64a64c8c79af1a15911c55306d83a797fa50969f77nikovoid Metadata::resetParcel() 65a64c8c79af1a15911c55306d83a797fa50969f77niko{ 66a64c8c79af1a15911c55306d83a797fa50969f77niko mData->setDataPosition(mBegin); 67a64c8c79af1a15911c55306d83a797fa50969f77niko} 68a64c8c79af1a15911c55306d83a797fa50969f77niko 69a64c8c79af1a15911c55306d83a797fa50969f77niko// Update the 4 bytes int at the beginning of the parcel which holds 70a64c8c79af1a15911c55306d83a797fa50969f77niko// the number of bytes written so far. 71a64c8c79af1a15911c55306d83a797fa50969f77nikovoid Metadata::updateLength() 72a64c8c79af1a15911c55306d83a797fa50969f77niko{ 73a64c8c79af1a15911c55306d83a797fa50969f77niko const size_t end = mData->dataPosition(); 74a64c8c79af1a15911c55306d83a797fa50969f77niko 75a64c8c79af1a15911c55306d83a797fa50969f77niko mData->setDataPosition(mBegin); 76a64c8c79af1a15911c55306d83a797fa50969f77niko mData->writeInt32(end - mBegin); 77a64c8c79af1a15911c55306d83a797fa50969f77niko mData->setDataPosition(end); 78a64c8c79af1a15911c55306d83a797fa50969f77niko} 79a64c8c79af1a15911c55306d83a797fa50969f77niko 80a64c8c79af1a15911c55306d83a797fa50969f77niko// Write the header. The java layer will look for the marker. 81a64c8c79af1a15911c55306d83a797fa50969f77nikobool Metadata::appendHeader() 82a64c8c79af1a15911c55306d83a797fa50969f77niko{ 83a64c8c79af1a15911c55306d83a797fa50969f77niko bool ok = true; 84a64c8c79af1a15911c55306d83a797fa50969f77niko 85a64c8c79af1a15911c55306d83a797fa50969f77niko // Placeholder for the length of the metadata 86a64c8c79af1a15911c55306d83a797fa50969f77niko ok = ok && mData->writeInt32(-1) == OK; 87a64c8c79af1a15911c55306d83a797fa50969f77niko ok = ok && mData->writeInt32(kMetaMarker) == OK; 88a64c8c79af1a15911c55306d83a797fa50969f77niko return ok; 89a64c8c79af1a15911c55306d83a797fa50969f77niko} 90a64c8c79af1a15911c55306d83a797fa50969f77niko 91a64c8c79af1a15911c55306d83a797fa50969f77nikobool Metadata::appendBool(int key, bool val) 92a64c8c79af1a15911c55306d83a797fa50969f77niko{ 93a64c8c79af1a15911c55306d83a797fa50969f77niko if (!checkKey(key)) { 94a64c8c79af1a15911c55306d83a797fa50969f77niko return false; 95a64c8c79af1a15911c55306d83a797fa50969f77niko } 96a64c8c79af1a15911c55306d83a797fa50969f77niko 97a64c8c79af1a15911c55306d83a797fa50969f77niko const size_t begin = mData->dataPosition(); 98a64c8c79af1a15911c55306d83a797fa50969f77niko bool ok = true; 99a64c8c79af1a15911c55306d83a797fa50969f77niko 100a64c8c79af1a15911c55306d83a797fa50969f77niko // 4 int32s: size, key, type, value. 101a64c8c79af1a15911c55306d83a797fa50969f77niko ok = ok && mData->writeInt32(4 * sizeof(int32_t)) == OK; 102a64c8c79af1a15911c55306d83a797fa50969f77niko ok = ok && mData->writeInt32(key) == OK; 103a64c8c79af1a15911c55306d83a797fa50969f77niko ok = ok && mData->writeInt32(BOOLEAN_VAL) == OK; 104a64c8c79af1a15911c55306d83a797fa50969f77niko ok = ok && mData->writeInt32(val ? 1 : 0) == OK; 105a64c8c79af1a15911c55306d83a797fa50969f77niko if (!ok) { 106a64c8c79af1a15911c55306d83a797fa50969f77niko mData->setDataPosition(begin); 107a64c8c79af1a15911c55306d83a797fa50969f77niko } 108a64c8c79af1a15911c55306d83a797fa50969f77niko return ok; 109a64c8c79af1a15911c55306d83a797fa50969f77niko} 110a64c8c79af1a15911c55306d83a797fa50969f77niko 111a64c8c79af1a15911c55306d83a797fa50969f77nikobool Metadata::appendInt32(int key, int32_t val) 112a64c8c79af1a15911c55306d83a797fa50969f77niko{ 113a64c8c79af1a15911c55306d83a797fa50969f77niko if (!checkKey(key)) { 114a64c8c79af1a15911c55306d83a797fa50969f77niko return false; 115a64c8c79af1a15911c55306d83a797fa50969f77niko } 116a64c8c79af1a15911c55306d83a797fa50969f77niko 117a64c8c79af1a15911c55306d83a797fa50969f77niko const size_t begin = mData->dataPosition(); 118a64c8c79af1a15911c55306d83a797fa50969f77niko bool ok = true; 119a64c8c79af1a15911c55306d83a797fa50969f77niko 120a64c8c79af1a15911c55306d83a797fa50969f77niko // 4 int32s: size, key, type, value. 121a64c8c79af1a15911c55306d83a797fa50969f77niko ok = ok && mData->writeInt32(4 * sizeof(int32_t)) == OK; 122a64c8c79af1a15911c55306d83a797fa50969f77niko ok = ok && mData->writeInt32(key) == OK; 123a64c8c79af1a15911c55306d83a797fa50969f77niko ok = ok && mData->writeInt32(INTEGER_VAL) == OK; 124a64c8c79af1a15911c55306d83a797fa50969f77niko ok = ok && mData->writeInt32(val) == OK; 125a64c8c79af1a15911c55306d83a797fa50969f77niko if (!ok) { 126a64c8c79af1a15911c55306d83a797fa50969f77niko mData->setDataPosition(begin); 127a64c8c79af1a15911c55306d83a797fa50969f77niko } 128a64c8c79af1a15911c55306d83a797fa50969f77niko return ok; 129a64c8c79af1a15911c55306d83a797fa50969f77niko} 130a64c8c79af1a15911c55306d83a797fa50969f77niko 131a64c8c79af1a15911c55306d83a797fa50969f77niko// Check the key (i.e metadata id) is valid if it is a system one. 132a64c8c79af1a15911c55306d83a797fa50969f77niko// Loop over all the exiting ones in the Parcel to check for duplicate 133a64c8c79af1a15911c55306d83a797fa50969f77niko// (not allowed). 134a64c8c79af1a15911c55306d83a797fa50969f77nikobool Metadata::checkKey(int key) 135a64c8c79af1a15911c55306d83a797fa50969f77niko{ 136a64c8c79af1a15911c55306d83a797fa50969f77niko if (key < FIRST_SYSTEM_ID || 137a64c8c79af1a15911c55306d83a797fa50969f77niko (LAST_SYSTEM_ID < key && key < FIRST_CUSTOM_ID)) { 13829357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47Steve Block ALOGE("Bad key %d", key); 139a64c8c79af1a15911c55306d83a797fa50969f77niko return false; 140a64c8c79af1a15911c55306d83a797fa50969f77niko } 141a64c8c79af1a15911c55306d83a797fa50969f77niko size_t curr = mData->dataPosition(); 142a64c8c79af1a15911c55306d83a797fa50969f77niko // Loop over the keys to check if it has been used already. 143a64c8c79af1a15911c55306d83a797fa50969f77niko mData->setDataPosition(mBegin); 144a64c8c79af1a15911c55306d83a797fa50969f77niko 145a64c8c79af1a15911c55306d83a797fa50969f77niko bool error = false; 146a64c8c79af1a15911c55306d83a797fa50969f77niko size_t left = curr - mBegin; 147a64c8c79af1a15911c55306d83a797fa50969f77niko while (left > 0) { 148a64c8c79af1a15911c55306d83a797fa50969f77niko size_t pos = mData->dataPosition(); 149a64c8c79af1a15911c55306d83a797fa50969f77niko size_t size = mData->readInt32(); 150a64c8c79af1a15911c55306d83a797fa50969f77niko if (size < kRecordHeaderSize || size > left) { 151a64c8c79af1a15911c55306d83a797fa50969f77niko error = true; 152a64c8c79af1a15911c55306d83a797fa50969f77niko break; 153a64c8c79af1a15911c55306d83a797fa50969f77niko } 154a64c8c79af1a15911c55306d83a797fa50969f77niko if (mData->readInt32() == key) { 15529357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47Steve Block ALOGE("Key exists already %d", key); 156a64c8c79af1a15911c55306d83a797fa50969f77niko error = true; 157a64c8c79af1a15911c55306d83a797fa50969f77niko break; 158a64c8c79af1a15911c55306d83a797fa50969f77niko } 159a64c8c79af1a15911c55306d83a797fa50969f77niko mData->setDataPosition(pos + size); 160a64c8c79af1a15911c55306d83a797fa50969f77niko left -= size; 161a64c8c79af1a15911c55306d83a797fa50969f77niko } 162a64c8c79af1a15911c55306d83a797fa50969f77niko mData->setDataPosition(curr); 163a64c8c79af1a15911c55306d83a797fa50969f77niko return !error; 164a64c8c79af1a15911c55306d83a797fa50969f77niko} 165a64c8c79af1a15911c55306d83a797fa50969f77niko 166a64c8c79af1a15911c55306d83a797fa50969f77niko} // namespace android::media 167a64c8c79af1a15911c55306d83a797fa50969f77niko} // namespace android 168