void writeImageGrid(const ImageGrid& grid, BitStream& output)
{
bool write32BitFields = false;
output.write8Bits(0); // version = 0
if ((grid.outputWidth > std::numeric_limits<std::uint16_t>::max()) &&
(grid.outputHeight > std::numeric_limits<std::uint16_t>::max()))
{
write32BitFields = true;
}
output.write8Bits(write32BitFields); // flags
output.write8Bits(grid.rowsMinusOne);
output.write8Bits(grid.columnsMinusOne);
if (write32BitFields)
{
output.write32Bits(grid.outputWidth);
output.write32Bits(grid.outputHeight);
}
else
{
output.write16Bits(static_cast<std::uint16_t>(grid.outputWidth));
output.write16Bits(static_cast<std::uint16_t>(grid.outputHeight));
}
}
void VideoMediaHeaderBox::writeBox(BitStream& bitstr)
{
// Write box headers
writeFullBoxHeader(bitstr);
bitstr.write16Bits(0); // graphicsmode = 0
bitstr.write16Bits(0); // opcolor = {0, 0, 0}
bitstr.write16Bits(0);
bitstr.write16Bits(0);
// Update the size of the movie box
updateSize(bitstr);
}
void SingleItemTypeReferenceBox::writeBox(BitStream& bitstr)
{
writeBoxHeader(bitstr); // parent box
bitstr.write16Bits(mFromItemId);
bitstr.write16Bits(mToItemIds.size());
for (const auto i : mToItemIds)
{
bitstr.write16Bits(i);
}
updateSize(bitstr);
}
void PrimaryItemBox::writeBox(BitStream& bitstr)
{
writeFullBoxHeader(bitstr);
if (getVersion() == 0)
{
bitstr.write16Bits(mItemId);
}
else
{
bitstr.write32Bits(mItemId);
}
updateSize(bitstr);
}
void writeImageOverlay(const ImageOverlay& iovl, BitStream& output)
{
bool write32BitFields = false;
if ((iovl.outputWidth > std::numeric_limits<std::uint16_t>::max()) &&
(iovl.outputHeight > std::numeric_limits<std::uint16_t>::max()))
{
write32BitFields = true;
}
for (const auto& entry : iovl.offsets)
{
if ((entry.horizontalOffset > std::numeric_limits<std::int16_t>::max()) ||
(entry.verticalOffset > std::numeric_limits<std::int16_t>::max()) ||
(entry.horizontalOffset < std::numeric_limits<std::int16_t>::min()) ||
(entry.verticalOffset < std::numeric_limits<std::int16_t>::min()))
{
write32BitFields = true;
break;
}
}
output.write8Bits(0); // version
output.write8Bits(write32BitFields); // flags
output.write16Bits(iovl.canvasFillValueR);
output.write16Bits(iovl.canvasFillValueG);
output.write16Bits(iovl.canvasFillValueB);
output.write16Bits(iovl.canvasFillValueA);
if (write32BitFields)
{
output.write32Bits(iovl.outputWidth);
output.write32Bits(iovl.outputHeight);
}
else
{
output.write16Bits(static_cast<std::uint16_t>(iovl.outputWidth));
output.write16Bits(static_cast<std::uint16_t>(iovl.outputHeight));
}
for (const auto& entry : iovl.offsets)
{
if (write32BitFields)
{
output.write32Bits(static_cast<std::uint32_t>(entry.horizontalOffset));
output.write32Bits(static_cast<std::uint32_t>(entry.verticalOffset));
}
else
{
output.write16Bits(static_cast<std::uint16_t>(entry.horizontalOffset));
output.write16Bits(static_cast<std::uint16_t>(entry.verticalOffset));
}
}
}
void ElementaryStreamDescriptorBox::writeBox(BitStream& bitstr) const
{
writeFullBoxHeader(bitstr);
bitstr.write8Bits(mES_Descriptor.ES_DescrTag);
bool esSizeConverged = false;
std::uint64_t esSizeSize;
std::uint32_t esDescriptorSize = mES_Descriptor.size;
BitStream esBitstr;
/* Write the whole stuff, then figure out if we wrote the correct
* size for it (we allos mES_Descriptor to be incorrect); rewrite
* everything with the correct size. However, this may increase
* the size due to bigger size having been written and thus moving
* the remaining of the data forward, so we may need to loop even
* thrice. */
while (!esSizeConverged)
{
esBitstr.clear();
esSizeSize = writeSize(esBitstr, esDescriptorSize);
esBitstr.write16Bits(mES_Descriptor.ES_ID);
esBitstr.write8Bits(mES_Descriptor.flags);
if (mES_Descriptor.flags & 0x80) // streamDependenceFlag as defined in 7.2.6.5.1 of ISO/IEC 14486-1:2010(E)
{
esBitstr.write16Bits(mES_Descriptor.dependsOn_ES_ID);
}
if (mES_Descriptor.flags & 0x40) // URL_Flag as defined in 7.2.6.5.1 of ISO/IEC 14486-1:2010(E)
{
esBitstr.write8Bits(mES_Descriptor.URLlength);
if (mES_Descriptor.URLlength)
{
esBitstr.writeString(mES_Descriptor.URLstring);
}
}
if (mES_Descriptor.flags & 0x20) // OCRstreamFlag as defined in 7.2.6.5.1 of ISO/IEC 14486-1:2010(E)
{
esBitstr.write16Bits(mES_Descriptor.OCR_ES_Id);
}
esBitstr.write8Bits(mES_Descriptor.decConfigDescr.DecoderConfigDescrTag);
BitStream decConfigBitstr;
std::uint64_t decConfigSize = mES_Descriptor.decConfigDescr.size;
std::uint64_t decConfigSizeSize;
bool decConfigSizeConverged = false;
while (!decConfigSizeConverged)
{
decConfigBitstr.clear();
decConfigSizeSize = writeSize(decConfigBitstr, static_cast<uint32_t>(decConfigSize));
decConfigBitstr.write8Bits(mES_Descriptor.decConfigDescr.objectTypeIndication);
decConfigBitstr.write8Bits((mES_Descriptor.decConfigDescr.streamType << 2) | 0x01);
decConfigBitstr.write24Bits(mES_Descriptor.decConfigDescr.bufferSizeDB);
decConfigBitstr.write32Bits(mES_Descriptor.decConfigDescr.maxBitrate);
decConfigBitstr.write32Bits(mES_Descriptor.decConfigDescr.avgBitrate);
if (mES_Descriptor.decConfigDescr.decSpecificInfo.DecSpecificInfoTag == 5)
{
writeDecoderSpecificInfo(decConfigBitstr, mES_Descriptor.decConfigDescr.decSpecificInfo);
}
for (const auto& decSpecificInfo : mOtherDecSpecificInfo)
{
writeDecoderSpecificInfo(decConfigBitstr, decSpecificInfo);
}
decConfigSizeConverged = decConfigBitstr.getSize() == std::uint64_t(decConfigSize) + decConfigSizeSize;
if (!decConfigSizeConverged)
{
decConfigSize = decConfigBitstr.getSize() - decConfigSizeSize;
}
}
esBitstr.writeBitStream(decConfigBitstr);
esSizeConverged = esBitstr.getSize() == std::uint64_t(esDescriptorSize) + esSizeSize;
if (!esSizeConverged)
{
esDescriptorSize = std::uint32_t(esBitstr.getSize() - esSizeSize);
}
}
bitstr.writeBitStream(esBitstr);
updateSize(bitstr);
}