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Unified Diff: webrtc/modules/rtp_rtcp/source/ulpfec_header_reader_writer.h

Issue 2260803002: Generalize FEC header formatting. (pt. 4) (Closed) Base URL: https://chromium.googlesource.com/external/webrtc.git@master
Patch Set: New upload for dependent patch sets. Created 4 years, 4 months ago
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Index: webrtc/modules/rtp_rtcp/source/ulpfec_header_reader_writer.h
diff --git a/webrtc/modules/rtp_rtcp/source/ulpfec_header_reader_writer.h b/webrtc/modules/rtp_rtcp/source/ulpfec_header_reader_writer.h
new file mode 100644
index 0000000000000000000000000000000000000000..23bce1de243e9f86b5b4963798c7ebd9ef40371e
--- /dev/null
+++ b/webrtc/modules/rtp_rtcp/source/ulpfec_header_reader_writer.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_ULPFEC_HEADER_READER_WRITER_H_
+#define WEBRTC_MODULES_RTP_RTCP_SOURCE_ULPFEC_HEADER_READER_WRITER_H_
+
+#include "webrtc/base/basictypes.h"
+#include "webrtc/modules/rtp_rtcp/source/forward_error_correction.h"
+
+namespace webrtc {
+
+// FEC Level 0 Header, 10 bytes.
+// 0 1 2 3
+// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |E|L|P|X| CC |M| PT recovery | SN base |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// | TS recovery |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// | length recovery |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//
+// FEC Level 1 Header, 4 bytes (L = 0) or 8 bytes (L = 1).
+// 0 1 2 3
+// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// | Protection Length | mask |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// | mask cont. (present only when L = 1) |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+class UlpfecHeaderReader : public FecHeaderReader {
+ public:
+ UlpfecHeaderReader();
+ ~UlpfecHeaderReader();
danilchap 2016/08/24 10:42:40 add override since base destructor is virtual
brandtr 2016/08/24 11:34:24 Done.
+
+ bool ReadFecHeader(
+ ForwardErrorCorrection::ReceivedFecPacket* fec_packet) const override;
+};
+
+class UlpfecHeaderWriter : public FecHeaderWriter {
+ public:
+ UlpfecHeaderWriter();
+ ~UlpfecHeaderWriter();
+
+ size_t MinPacketMaskSize(const uint8_t* packet_mask,
+ size_t packet_mask_size) const override;
+
+ size_t FecHeaderSize(size_t packet_mask_row_size) const override;
+
+ void FinalizeFecHeader(
+ const ForwardErrorCorrection::PacketList& media_packets,
+ const uint8_t* packet_mask,
+ size_t packet_mask_size,
+ ForwardErrorCorrection::Packet* fec_packet) const override;
+};
+
+} // namespace webrtc
+
+#endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_ULPFEC_HEADER_READER_WRITER_H_

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