/*
 * Copyright (c) 2012 Yoann Blein
 * Licensed under the simplified BSD license.
 * See Documentation/Licenses/BSD-simplified.txt for more information.
 */

#include <Swiften/ScreenSharing/VP8RTPParser.h>

#include <Swiften/ScreenSharing/VP8Decoder.h>

namespace Swift {

VP8RTPParser::VP8RTPParser(VP8Decoder* decoder)
	: decoder(decoder), firstPacket(true)
{
}

void VP8RTPParser::newPayloadReceived(const uint8_t* data, size_t len, bool hasMarker)
{
	// Payload descriptor
	uint8_t req = data[0];
	if (firstPacket && !(req & SBit)) { /* Error */ }

	size_t headerSize;
	// Payload header
	if (firstPacket) {
		firstPacket = false;

		uint8_t o1 = data[1];
		showFrame = (o1 & 1);
		isKeyFrame = (o1 & HBit);
		o1 >>= Size0BitShift;
		frameSize = o1 + 8 * data[2] + 2048 * data[3];

		headerSize = 4;
	} else {
		headerSize = 1;
	}

	buffer.insert(buffer.end(), data + headerSize, data + len);

	if (hasMarker || buffer.size() >= frameSize) {
		// Frame received
		decoder->decodeFrame(buffer);
		buffer.clear();
		firstPacket = true;
	}
}

}