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/*
* 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(VideoDecoder* decoder)
: decoder(decoder), firstPacket(true), pictureID(0)
{
}
void VP8RTPParser::newPayloadReceived(const uint8_t* data, size_t len, bool hasMarker)
{
size_t headerSize = 1;
// Payload descriptor
uint8_t req = data[0];
if (firstPacket && !(req & SBit)) { /* Error */ }
if (req & XBit) { // Extension byte is present
uint8_t optX = data[headerSize++];
if (optX & IBit) { // PictureID byte is present
uint8_t optI = data[headerSize++];
pictureID = optI >> 1;
}
}
// Payload header
if (firstPacket) {
firstPacket = false;
uint8_t o1 = data[headerSize];
showFrame = (o1 & 1);
isKeyFrame = (o1 & HBit);
o1 >>= Size0BitShift;
frameSize = o1 + 8 * data[headerSize + 1] + 2048 * data[headerSize + 2];
headerSize += 3;
}
buffer.insert(buffer.end(), data + headerSize, data + len);
if (hasMarker || buffer.size() >= frameSize) {
// Frame received
decoder->decodeFrame(buffer, pictureID);
buffer.clear();
firstPacket = true;
}
}
}
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Swift