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249 lines
5.4 KiB
249 lines
5.4 KiB
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#define LOG_TAG "ESDS"
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#include <utils/Log.h>
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#include <media/stagefright/Utils.h>
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#include "include/ESDS.h"
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#include <string.h>
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namespace android {
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ESDS::ESDS(const void *data, size_t size)
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: mData(new uint8_t[size]),
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mSize(size),
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mInitCheck(NO_INIT),
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mDecoderSpecificOffset(0),
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mDecoderSpecificLength(0),
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mObjectTypeIndication(0) {
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memcpy(mData, data, size);
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mInitCheck = parse();
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}
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ESDS::~ESDS() {
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delete[] mData;
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mData = NULL;
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}
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status_t ESDS::InitCheck() const {
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return mInitCheck;
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}
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status_t ESDS::getObjectTypeIndication(uint8_t *objectTypeIndication) const {
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if (mInitCheck != OK) {
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return mInitCheck;
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}
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*objectTypeIndication = mObjectTypeIndication;
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return OK;
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}
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status_t ESDS::getCodecSpecificInfo(const void **data, size_t *size) const {
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if (mInitCheck != OK) {
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return mInitCheck;
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}
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*data = &mData[mDecoderSpecificOffset];
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*size = mDecoderSpecificLength;
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return OK;
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}
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status_t ESDS::skipDescriptorHeader(
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size_t offset, size_t size,
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uint8_t *tag, size_t *data_offset, size_t *data_size) const {
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if (size == 0) {
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return ERROR_MALFORMED;
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}
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*tag = mData[offset++];
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--size;
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*data_size = 0;
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bool more;
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do {
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if (size == 0) {
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return ERROR_MALFORMED;
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}
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uint8_t x = mData[offset++];
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--size;
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*data_size = (*data_size << 7) | (x & 0x7f);
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more = (x & 0x80) != 0;
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}
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while (more);
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ALOGV("tag=0x%02x data_size=%zu", *tag, *data_size);
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if (*data_size > size) {
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return ERROR_MALFORMED;
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}
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*data_offset = offset;
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return OK;
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}
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status_t ESDS::parse() {
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uint8_t tag;
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size_t data_offset;
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size_t data_size;
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status_t err =
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skipDescriptorHeader(0, mSize, &tag, &data_offset, &data_size);
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if (err != OK) {
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return err;
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}
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if (tag != kTag_ESDescriptor) {
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return ERROR_MALFORMED;
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}
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return parseESDescriptor(data_offset, data_size);
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}
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status_t ESDS::parseESDescriptor(size_t offset, size_t size) {
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if (size < 3) {
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return ERROR_MALFORMED;
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}
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offset += 2; // skip ES_ID
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size -= 2;
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unsigned streamDependenceFlag = mData[offset] & 0x80;
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unsigned URL_Flag = mData[offset] & 0x40;
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unsigned OCRstreamFlag = mData[offset] & 0x20;
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++offset;
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--size;
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if (streamDependenceFlag) {
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if (size < 2)
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return ERROR_MALFORMED;
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offset += 2;
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size -= 2;
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}
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if (URL_Flag) {
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if (offset >= size) {
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return ERROR_MALFORMED;
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}
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unsigned URLlength = mData[offset];
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if (URLlength >= size)
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return ERROR_MALFORMED;
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offset += URLlength + 1;
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size -= URLlength + 1;
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}
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if (OCRstreamFlag) {
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if (size < 2)
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return ERROR_MALFORMED;
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offset += 2;
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size -= 2;
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if ((offset >= size || mData[offset] != kTag_DecoderConfigDescriptor)
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&& offset - 2 < size
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&& mData[offset - 2] == kTag_DecoderConfigDescriptor) {
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// Content found "in the wild" had OCRstreamFlag set but was
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// missing OCR_ES_Id, the decoder config descriptor immediately
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// followed instead.
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offset -= 2;
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size += 2;
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ALOGW("Found malformed 'esds' atom, ignoring missing OCR_ES_Id.");
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}
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}
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if (offset >= size) {
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return ERROR_MALFORMED;
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}
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uint8_t tag;
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size_t sub_offset, sub_size;
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status_t err = skipDescriptorHeader(
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offset, size, &tag, &sub_offset, &sub_size);
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if (err != OK) {
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return err;
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}
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if (tag != kTag_DecoderConfigDescriptor) {
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return ERROR_MALFORMED;
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}
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err = parseDecoderConfigDescriptor(sub_offset, sub_size);
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return err;
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}
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status_t ESDS::getBitRate(uint32_t *brateMax, uint32_t *brateAvg) const {
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if (mInitCheck != OK) {
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return mInitCheck;
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}
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*brateMax = mBitRateMax;
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*brateAvg = mBitRateAvg;
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return OK;
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};
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status_t ESDS::parseDecoderConfigDescriptor(size_t offset, size_t size) {
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if (size < 13) {
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return ERROR_MALFORMED;
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}
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mObjectTypeIndication = mData[offset];
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mBitRateMax = U32_AT(mData + offset + 5);
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mBitRateAvg = U32_AT(mData + offset + 9);
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offset += 13;
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size -= 13;
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if (size == 0) {
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mDecoderSpecificOffset = 0;
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mDecoderSpecificLength = 0;
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return OK;
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}
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uint8_t tag;
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size_t sub_offset, sub_size;
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status_t err = skipDescriptorHeader(
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offset, size, &tag, &sub_offset, &sub_size);
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if (err != OK) {
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return err;
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}
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if (tag != kTag_DecoderSpecificInfo) {
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return ERROR_MALFORMED;
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}
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mDecoderSpecificOffset = sub_offset;
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mDecoderSpecificLength = sub_size;
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return OK;
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}
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} // namespace android
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