moonlight-stream/moonlight-common-c
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Fix decoding of large FEC index values (greater than 255)

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This commit is contained in:
Cameron Gutman 2018-09-04 18:46:22 -07:00
parent fa7b23f339
commit 6e633498c3
1 changed files with 8 additions and 6 deletions
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14
src/RtpFecQueue.c
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@ -227,6 +227,8 @@ int RtpfAddPacket(PRTP_FEC_QUEUE queue, PRTP_PACKET packet, int length, PRTPFEC_
// Reject frames behind our current frame number // Reject frames behind our current frame number
return RTPF_RET_REJECTED; return RTPF_RET_REJECTED;
} }
int fecIndex = (nvPacket->fecInfo & 0x3FF000) >> 12;
// Reinitialize the queue if it's empty after a frame delivery or // Reinitialize the queue if it's empty after a frame delivery or
// if we can't finish a frame before receiving the next one. // if we can't finish a frame before receiving the next one.
@ -251,20 +253,20 @@ int RtpfAddPacket(PRTP_FEC_QUEUE queue, PRTP_PACKET packet, int length, PRTPFEC_
queue->bufferTail = NULL; queue->bufferTail = NULL;
queue->bufferSize = 0; queue->bufferSize = 0;
int fecIndex = (nvPacket->fecInfo & 0xFF000) >> 12;
queue->bufferLowestSequenceNumber = U16(packet->sequenceNumber - fecIndex); queue->bufferLowestSequenceNumber = U16(packet->sequenceNumber - fecIndex);
queue->receivedBufferDataPackets = 0; queue->receivedBufferDataPackets = 0;
queue->bufferHighestSequenceNumber = packet->sequenceNumber; queue->bufferHighestSequenceNumber = packet->sequenceNumber;
queue->bufferDataPackets = ((nvPacket->fecInfo & 0xFFF00000) >> 20) / 4; queue->bufferDataPackets = (nvPacket->fecInfo & 0xFFC00000) >> 22;
queue->fecPercentage = ((nvPacket->fecInfo & 0xFF0) >> 4); queue->fecPercentage = (nvPacket->fecInfo & 0xFF0) >> 4;
queue->bufferFirstParitySequenceNumber = U16(queue->bufferLowestSequenceNumber + queue->bufferDataPackets); queue->bufferFirstParitySequenceNumber = U16(queue->bufferLowestSequenceNumber + queue->bufferDataPackets);
} else if (isBefore16(queue->bufferHighestSequenceNumber, packet->sequenceNumber)) { } else if (isBefore16(queue->bufferHighestSequenceNumber, packet->sequenceNumber)) {
queue->bufferHighestSequenceNumber = packet->sequenceNumber; queue->bufferHighestSequenceNumber = packet->sequenceNumber;
} }
LC_ASSERT(((nvPacket->fecInfo & 0xFF0) >> 4) == queue->fecPercentage); LC_ASSERT(U16(packet->sequenceNumber - fecIndex) == queue->bufferLowestSequenceNumber);
LC_ASSERT(((nvPacket->fecInfo & 0xFFF00000) >> 20) / 4 == queue->bufferDataPackets); LC_ASSERT((nvPacket->fecInfo & 0xFF0) >> 4 == queue->fecPercentage);
LC_ASSERT((nvPacket->fecInfo & 0xFFC00000) >> 22 == queue->bufferDataPackets);
if (!queuePacket(queue, packetEntry, 0, packet, length, !isBefore16(packet->sequenceNumber, queue->bufferFirstParitySequenceNumber))) { if (!queuePacket(queue, packetEntry, 0, packet, length, !isBefore16(packet->sequenceNumber, queue->bufferFirstParitySequenceNumber))) {
return RTPF_RET_REJECTED; return RTPF_RET_REJECTED;
} }