mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/*
|
|
* Copyright 2015, Mozilla Foundation and contributors
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include "AnnexB.h"
|
|
#include "Endian.h"
|
|
|
|
#include <cstring>
|
|
|
|
using mozilla::BigEndian;
|
|
|
|
static const uint8_t kAnnexBDelimiter[] = { 0, 0, 0, 1 };
|
|
|
|
/* static */ void
|
|
AnnexB::ConvertFrameInPlace(std::vector<uint8_t>& aBuffer)
|
|
{
|
|
for (size_t i = 0; i < aBuffer.size() - 4 - sizeof(kAnnexBDelimiter) + 1; ) {
|
|
uint32_t nalLen = BigEndian::readUint32(&aBuffer[i]);
|
|
memcpy(&aBuffer[i], kAnnexBDelimiter, sizeof(kAnnexBDelimiter));
|
|
i += nalLen + 4;
|
|
}
|
|
}
|
|
|
|
static void
|
|
ConvertParamSetToAnnexB(std::vector<uint8_t>::const_iterator& aIter,
|
|
size_t aCount,
|
|
std::vector<uint8_t>& aOutAnnexB)
|
|
{
|
|
for (size_t i = 0; i < aCount; i++) {
|
|
aOutAnnexB.insert(aOutAnnexB.end(), kAnnexBDelimiter,
|
|
kAnnexBDelimiter + sizeof(kAnnexBDelimiter));
|
|
|
|
uint16_t len = BigEndian::readUint16(&*aIter); aIter += 2;
|
|
aOutAnnexB.insert(aOutAnnexB.end(), aIter, aIter + len); aIter += len;
|
|
}
|
|
}
|
|
|
|
/* static */ void
|
|
AnnexB::ConvertConfig(const std::vector<uint8_t>& aBuffer,
|
|
std::vector<uint8_t>& aOutAnnexB)
|
|
{
|
|
// Skip past irrelevant headers
|
|
auto it = aBuffer.begin() + 5;
|
|
|
|
if (it >= aBuffer.end()) {
|
|
return;
|
|
}
|
|
|
|
size_t count = *(it++) & 31;
|
|
|
|
// Check that we have enough bytes for the Annex B conversion
|
|
// and the next size field. Bail if not.
|
|
if (it + count * 2 >= aBuffer.end()) {
|
|
return;
|
|
}
|
|
|
|
ConvertParamSetToAnnexB(it, count, aOutAnnexB);
|
|
|
|
// Check that we have enough bytes for the Annex B conversion.
|
|
count = *(it++);
|
|
if (it + count * 2 > aBuffer.end()) {
|
|
aOutAnnexB.clear();
|
|
return;
|
|
}
|
|
|
|
ConvertParamSetToAnnexB(it, count, aOutAnnexB);
|
|
}
|