Index: webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.h |
diff --git a/webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.h b/webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.h |
index 82f02c21e56855511b509dcd5527b7cd861024bb..5fc03316eaeb93f0f162ed03205f34a8649d8271 100644 |
--- a/webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.h |
+++ b/webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.h |
@@ -16,10 +16,17 @@ |
namespace webrtc { |
-// Packet mask size in bytes (L bit is set). |
-constexpr size_t kMaskSizeLBitSet = 6; |
-// Packet mask size in bytes (L bit is cleared). |
-constexpr size_t kMaskSizeLBitClear = 2; |
+// Maximum number of media packets that can be protected |
+// by these packet masks. |
+constexpr size_t kUlpfecMaxMediaPackets = 48; |
+ |
+// Packet mask size in bytes (given L bit). |
+constexpr size_t kUlpfecPacketMaskSizeLBitClear = 2; |
+constexpr size_t kUlpfecPacketMaskSizeLBitSet = 6; |
+ |
+// Convenience constants. |
+constexpr size_t kUlpfecMinPacketMaskSize = kUlpfecPacketMaskSizeLBitClear; |
+constexpr size_t kUlpfecMaxPacketMaskSize = kUlpfecPacketMaskSizeLBitSet; |
namespace internal { |
@@ -65,6 +72,11 @@ void GeneratePacketMasks(int num_media_packets, int num_fec_packets, |
const PacketMaskTable& mask_table, |
uint8_t* packet_mask); |
+// Given a sequence number spread (i.e., the difference between the largest |
danilchap
2016/08/29 12:26:03
'plus one' in the comment feels strange.
may be in
brandtr
2016/08/30 07:12:41
Updated comment.
|
+// and smallest sequence number, plus one), returns the required packet |
+// mask size. |
+size_t PacketMaskSize(size_t seq_num_spread); |
+ |
// Inserts |num_zeros| zero columns into |new_mask| at position |
// |new_bit_index|. If the current byte of |new_mask| can't fit all zeros, the |
// byte will be filled with zeros from |new_bit_index|, but the next byte will |