C++ WriteStream::writeUint16LE方法代码示例

void MainWindow::exportWAVImpl(Sound::AudioStream *sound, Common::WriteStream &wav) {
	assert(sound);

	const uint16 channels = sound->getChannels();
	const uint32 rate     = sound->getRate();

	std::deque<SoundBuffer> buffers;

	uint64 length = getSoundLength(sound);
	if (length != Sound::RewindableAudioStream::kInvalidLength)
		buffers.resize((length / (SoundBuffer::kBufferSize / channels)) + 1);

	uint32 samples = 0;
	std::deque<SoundBuffer>::iterator buffer = buffers.begin();
	while (!sound->endOfStream()) {
		if (buffer == buffers.end()) {
			buffers.push_back(SoundBuffer());
			buffer = --buffers.end();
		}

		buffer->samples = sound->readBuffer(buffer->buffer, SoundBuffer::kBufferSize);

		if (buffer->samples > 0)
			samples += buffer->samples;

		++buffer;
	}

	samples /= channels;

	const uint32 dataSize   = samples * channels * 2;
	const uint32 byteRate   = rate * channels * 2;
	const uint16 blockAlign = channels * 2;

	wav.writeUint32BE(MKTAG('R', 'I', 'F', 'F'));
	wav.writeUint32LE(36 + dataSize);
	wav.writeUint32BE(MKTAG('W', 'A', 'V', 'E'));

	wav.writeUint32BE(MKTAG('f', 'm', 't', ' '));
	wav.writeUint32LE(16);
	wav.writeUint16LE(1);
	wav.writeUint16LE(channels);
	wav.writeUint32LE(rate);
	wav.writeUint32LE(byteRate);
	wav.writeUint16LE(blockAlign);
	wav.writeUint16LE(16);

	wav.writeUint32BE(MKTAG('d', 'a', 't', 'a'));
	wav.writeUint32LE(dataSize);

	for (std::deque<SoundBuffer>::const_iterator b = buffers.begin(); b != buffers.end(); ++b)
		for (int i = 0; i < b->samples; i++)
			wav.writeUint16LE(b->buffer[i]);
}

static void saveOrLoadCommonArray(Common::WriteStream &stream, A &array) {
	uint count = array.size();
	assert(count < 0xFFFF);
	stream.writeUint16LE(count);
	for (uint i = 0; i < count; ++i) {
		saveOrLoad(stream, array[i]);
	}
}

static void saveOrLoad(Common::WriteStream &stream, uint16 &i) {
	stream.writeUint16LE(i);
}

void TwoDAFile::writeBinary(Common::WriteStream &out) const {
	const size_t columnCount = _headers.size();
	const size_t rowCount    = _rows.size();
	const size_t cellCount   = columnCount * rowCount;

	out.writeString("2DA V2.b\n");

	// Write the column headers

	for (std::vector<Common::UString>::const_iterator h = _headers.begin(); h != _headers.end(); ++h) {
		out.writeString(*h);
		out.writeByte('\t');
	}
	out.writeByte('\0');

	// Write the row indices

	out.writeUint32LE((uint32) rowCount);
	for (size_t i = 0; i < rowCount; i++) {
		out.writeString(Common::composeString(i));
		out.writeByte('\t');
	}

	/* Deduplicate cell data strings. Binary 2DA files don't store the
	 * data for each cell directly: instead, each cell contains an offset
	 * into a data array. This way, cells with the same data only need to
	 * to store this data once.
	 *
	 * The original binary 2DA files in KotOR/KotOR2 make extensive use
	 * of that, and we should do this as well.
	 *
	 * Basically, this involves going through each cell, and looking up
	 * if we already saved this particular piece of data. If not, save
	 * it, otherwise only remember the offset. There's no need to be
	 * particularly smart about it, so we're just doing it the naive
	 * O(n^2) way.
	 */

	std::vector<Common::UString> data;
	std::vector<size_t> offsets;

	data.reserve(cellCount);
	offsets.reserve(cellCount);

	size_t dataSize = 0;

	std::vector<size_t> cells;
	cells.reserve(cellCount);

	for (size_t i = 0; i < rowCount; i++) {
		assert(_rows[i]);

		for (size_t j = 0; j < columnCount; j++) {
			const Common::UString cell = _rows[i]->getString(j);

			// Do we already know about this cell data string?
			size_t foundCell = SIZE_MAX;
			for (size_t k = 0; k < data.size(); k++) {
				if (data[k] == cell) {
					foundCell = k;
					break;
				}
			}

			// If not, add it to the cell data array
			if (foundCell == SIZE_MAX) {
				foundCell = data.size();

				data.push_back(cell);
				offsets.push_back(dataSize);

				dataSize += data.back().size() + 1;

				if (dataSize > 65535)
					throw Common::Exception("TwoDAFile::writeBinary(): Cell data size overflow");
			}

			// Remember the offset to the cell data array
			cells.push_back(offsets[foundCell]);
		}
	}

	// Write cell data offsets
	for (std::vector<size_t>::const_iterator c = cells.begin(); c != cells.end(); ++c)
		out.writeUint16LE((uint16) *c);

	// Size of the all cell data strings
	out.writeUint16LE((uint16) dataSize);

	// Write cell data strings
	for (std::vector<Common::UString>::const_iterator d = data.begin(); d != data.end(); ++d) {
		out.writeString(*d);
		out.writeByte('\0');
	}
}