Andreas Huber | e46b7be | 2009-07-14 16:56:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
Andreas Huber | bd7b43b | 2009-10-13 10:22:55 -0700 | [diff] [blame] | 17 | #include "include/ESDS.h" |
Andreas Huber | e46b7be | 2009-07-14 16:56:47 -0700 | [diff] [blame] | 18 | |
| 19 | #include <string.h> |
| 20 | |
| 21 | namespace android { |
| 22 | |
| 23 | ESDS::ESDS(const void *data, size_t size) |
| 24 | : mData(new uint8_t[size]), |
| 25 | mSize(size), |
| 26 | mInitCheck(NO_INIT), |
| 27 | mDecoderSpecificOffset(0), |
Andreas Huber | d0332ad | 2010-04-12 16:05:57 -0700 | [diff] [blame] | 28 | mDecoderSpecificLength(0), |
| 29 | mObjectTypeIndication(0) { |
Andreas Huber | e46b7be | 2009-07-14 16:56:47 -0700 | [diff] [blame] | 30 | memcpy(mData, data, size); |
| 31 | |
| 32 | mInitCheck = parse(); |
| 33 | } |
| 34 | |
| 35 | ESDS::~ESDS() { |
| 36 | delete[] mData; |
| 37 | mData = NULL; |
| 38 | } |
| 39 | |
| 40 | status_t ESDS::InitCheck() const { |
| 41 | return mInitCheck; |
| 42 | } |
| 43 | |
Andreas Huber | d0332ad | 2010-04-12 16:05:57 -0700 | [diff] [blame] | 44 | status_t ESDS::getObjectTypeIndication(uint8_t *objectTypeIndication) const { |
| 45 | if (mInitCheck != OK) { |
| 46 | return mInitCheck; |
| 47 | } |
| 48 | |
| 49 | *objectTypeIndication = mObjectTypeIndication; |
| 50 | |
| 51 | return OK; |
| 52 | } |
| 53 | |
Andreas Huber | e46b7be | 2009-07-14 16:56:47 -0700 | [diff] [blame] | 54 | status_t ESDS::getCodecSpecificInfo(const void **data, size_t *size) const { |
| 55 | if (mInitCheck != OK) { |
| 56 | return mInitCheck; |
| 57 | } |
| 58 | |
| 59 | *data = &mData[mDecoderSpecificOffset]; |
| 60 | *size = mDecoderSpecificLength; |
| 61 | |
| 62 | return OK; |
| 63 | } |
| 64 | |
| 65 | status_t ESDS::skipDescriptorHeader( |
| 66 | size_t offset, size_t size, |
| 67 | uint8_t *tag, size_t *data_offset, size_t *data_size) const { |
| 68 | if (size == 0) { |
| 69 | return ERROR_MALFORMED; |
| 70 | } |
| 71 | |
| 72 | *tag = mData[offset++]; |
| 73 | --size; |
| 74 | |
| 75 | *data_size = 0; |
| 76 | bool more; |
| 77 | do { |
| 78 | if (size == 0) { |
| 79 | return ERROR_MALFORMED; |
| 80 | } |
| 81 | |
| 82 | uint8_t x = mData[offset++]; |
| 83 | --size; |
| 84 | |
| 85 | *data_size = (*data_size << 7) | (x & 0x7f); |
| 86 | more = (x & 0x80) != 0; |
| 87 | } |
| 88 | while (more); |
| 89 | |
| 90 | if (*data_size > size) { |
| 91 | return ERROR_MALFORMED; |
| 92 | } |
| 93 | |
| 94 | *data_offset = offset; |
| 95 | |
| 96 | return OK; |
| 97 | } |
| 98 | |
| 99 | status_t ESDS::parse() { |
| 100 | uint8_t tag; |
| 101 | size_t data_offset; |
| 102 | size_t data_size; |
| 103 | status_t err = |
| 104 | skipDescriptorHeader(0, mSize, &tag, &data_offset, &data_size); |
| 105 | |
| 106 | if (err != OK) { |
| 107 | return err; |
| 108 | } |
| 109 | |
| 110 | if (tag != kTag_ESDescriptor) { |
| 111 | return ERROR_MALFORMED; |
| 112 | } |
| 113 | |
| 114 | return parseESDescriptor(data_offset, data_size); |
| 115 | } |
| 116 | |
| 117 | status_t ESDS::parseESDescriptor(size_t offset, size_t size) { |
| 118 | if (size < 3) { |
| 119 | return ERROR_MALFORMED; |
| 120 | } |
| 121 | |
| 122 | offset += 2; // skip ES_ID |
| 123 | size -= 2; |
| 124 | |
| 125 | unsigned streamDependenceFlag = mData[offset] & 0x80; |
| 126 | unsigned URL_Flag = mData[offset] & 0x40; |
| 127 | unsigned OCRstreamFlag = mData[offset] & 0x20; |
| 128 | |
| 129 | ++offset; |
| 130 | --size; |
| 131 | |
| 132 | if (streamDependenceFlag) { |
| 133 | offset += 2; |
| 134 | size -= 2; |
| 135 | } |
| 136 | |
| 137 | if (URL_Flag) { |
| 138 | if (offset >= size) { |
| 139 | return ERROR_MALFORMED; |
| 140 | } |
| 141 | unsigned URLlength = mData[offset]; |
| 142 | offset += URLlength + 1; |
| 143 | size -= URLlength + 1; |
| 144 | } |
| 145 | |
| 146 | if (OCRstreamFlag) { |
| 147 | offset += 2; |
| 148 | size -= 2; |
| 149 | } |
| 150 | |
| 151 | if (offset >= size) { |
| 152 | return ERROR_MALFORMED; |
| 153 | } |
| 154 | |
| 155 | uint8_t tag; |
| 156 | size_t sub_offset, sub_size; |
| 157 | status_t err = skipDescriptorHeader( |
| 158 | offset, size, &tag, &sub_offset, &sub_size); |
| 159 | |
| 160 | if (err != OK) { |
| 161 | return err; |
| 162 | } |
| 163 | |
| 164 | if (tag != kTag_DecoderConfigDescriptor) { |
| 165 | return ERROR_MALFORMED; |
| 166 | } |
| 167 | |
| 168 | err = parseDecoderConfigDescriptor(sub_offset, sub_size); |
| 169 | |
| 170 | return err; |
| 171 | } |
| 172 | |
| 173 | status_t ESDS::parseDecoderConfigDescriptor(size_t offset, size_t size) { |
| 174 | if (size < 13) { |
| 175 | return ERROR_MALFORMED; |
| 176 | } |
| 177 | |
Andreas Huber | d0332ad | 2010-04-12 16:05:57 -0700 | [diff] [blame] | 178 | mObjectTypeIndication = mData[offset]; |
| 179 | |
Andreas Huber | e46b7be | 2009-07-14 16:56:47 -0700 | [diff] [blame] | 180 | offset += 13; |
| 181 | size -= 13; |
| 182 | |
| 183 | if (size == 0) { |
| 184 | mDecoderSpecificOffset = 0; |
| 185 | mDecoderSpecificLength = 0; |
| 186 | return OK; |
| 187 | } |
| 188 | |
| 189 | uint8_t tag; |
| 190 | size_t sub_offset, sub_size; |
| 191 | status_t err = skipDescriptorHeader( |
| 192 | offset, size, &tag, &sub_offset, &sub_size); |
| 193 | |
| 194 | if (err != OK) { |
| 195 | return err; |
| 196 | } |
| 197 | |
| 198 | if (tag != kTag_DecoderSpecificInfo) { |
| 199 | return ERROR_MALFORMED; |
| 200 | } |
| 201 | |
| 202 | mDecoderSpecificOffset = sub_offset; |
| 203 | mDecoderSpecificLength = sub_size; |
| 204 | |
| 205 | return OK; |
| 206 | } |
| 207 | |
| 208 | } // namespace android |
| 209 | |