Index: webrtc/modules/rtp_rtcp/source/rtp_header_extensions.cc |
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_header_extensions.cc b/webrtc/modules/rtp_rtcp/source/rtp_header_extensions.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..a551b15617b55677efdf80050426d077b41af311 |
--- /dev/null |
+++ b/webrtc/modules/rtp_rtcp/source/rtp_header_extensions.cc |
@@ -0,0 +1,203 @@ |
+/* |
+ * 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. |
+ */ |
+ |
+#include "webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h" |
+ |
+#include "webrtc/base/checks.h" |
+#include "webrtc/base/logging.h" |
+#include "webrtc/modules/rtp_rtcp/include/rtp_cvo.h" |
+#include "webrtc/modules/rtp_rtcp/source/byte_io.h" |
+ |
+namespace webrtc { |
+// Absolute send time in RTP streams. |
+// |
+// The absolute send time is signaled to the receiver in-band using the |
+// general mechanism for RTP header extensions [RFC5285]. The payload |
+// of this extension (the transmitted value) is a 24-bit unsigned integer |
+// containing the sender's current time in seconds as a fixed point number |
+// with 18 bits fractional part. |
+// |
+// The form of the absolute send time extension block: |
+// |
+// 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 |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
+// | ID | len=2 | absolute send time | |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
+const char* AbsoluteSendTime::kName = |
+ "http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time"; |
+bool AbsoluteSendTime::IsSupportedFor(MediaType type) { |
+ return true; |
+} |
+ |
+bool AbsoluteSendTime::Parse(const uint8_t* data, uint32_t* value) { |
+ *value = ByteReader<uint32_t, 3>::ReadBigEndian(data); |
+ return true; |
+} |
+ |
+bool AbsoluteSendTime::Write(uint8_t* data, int64_t time_ms) { |
+ const uint32_t kAbsSendTimeFraction = 18; |
+ uint32_t time_24_bits = |
+ static_cast<uint32_t>(((time_ms << kAbsSendTimeFraction) + 500) / 1000) & |
+ 0x00FFFFFF; |
+ |
+ ByteWriter<uint32_t, 3>::WriteBigEndian(data, time_24_bits); |
+ return true; |
+} |
+ |
+// An RTP Header Extension for Client-to-Mixer Audio Level Indication |
+// |
+// https://datatracker.ietf.org/doc/draft-lennox-avt-rtp-audio-level-exthdr/ |
+// |
+// The form of the audio level extension block: |
+// |
+// 0 1 |
+// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
+// | ID | len=0 |V| level | |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
+// |
+const char* AudioLevel::kName = "urn:ietf:params:rtp-hdrext:ssrc-audio-level"; |
+bool AudioLevel::IsSupportedFor(MediaType type) { |
+ switch (type) { |
+ case MediaType::ANY: |
+ case MediaType::AUDIO: |
+ return true; |
+ case MediaType::VIDEO: |
+ case MediaType::DATA: |
+ return false; |
+ } |
+ RTC_NOTREACHED(); |
+ return false; |
+} |
+ |
+bool AudioLevel::Parse(const uint8_t* data, |
+ bool* voice_activity, |
+ uint8_t* audio_level) { |
+ *voice_activity = (data[0] & 0x80) != 0; |
+ *audio_level = data[0] & 0x7F; |
+ return true; |
+} |
+ |
+bool AudioLevel::Write(uint8_t* data, |
+ bool voice_activity, |
+ uint8_t audio_level) { |
+ RTC_CHECK_LE(audio_level, 0x7f); |
+ data[0] = (voice_activity ? 0x80 : 0x00) | audio_level; |
+ return true; |
+} |
+ |
+// From RFC 5450: Transmission Time Offsets in RTP Streams. |
+// |
+// The transmission time is signaled to the receiver in-band using the |
+// general mechanism for RTP header extensions [RFC5285]. The payload |
+// of this extension (the transmitted value) is a 24-bit signed integer. |
+// When added to the RTP timestamp of the packet, it represents the |
+// "effective" RTP transmission time of the packet, on the RTP |
+// timescale. |
+// |
+// The form of the transmission offset extension block: |
+// |
+// 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 |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
+// | ID | len=2 | transmission offset | |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
+const char* TransmissionOffset::kName = "urn:ietf:params:rtp-hdrext:toffset"; |
+bool TransmissionOffset::IsSupportedFor(MediaType type) { |
+ switch (type) { |
+ case MediaType::ANY: |
+ case MediaType::VIDEO: |
+ return true; |
+ case MediaType::AUDIO: |
+ case MediaType::DATA: |
+ return false; |
+ } |
+ RTC_NOTREACHED(); |
+ return false; |
+} |
+ |
+bool TransmissionOffset::Parse(const uint8_t* data, int32_t* value) { |
+ *value = ByteReader<int32_t, 3>::ReadBigEndian(data); |
+ return true; |
+} |
+ |
+bool TransmissionOffset::Write(uint8_t* data, int64_t value) { |
+ RTC_CHECK_LE(value, 0x00ffffff); |
+ ByteWriter<int32_t, 3>::WriteBigEndian(data, value); |
+ return true; |
+} |
+ |
+// 0 1 2 |
+// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
+// | ID | L=1 |transport wide sequence number | |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
+const char* TransportSequenceNumber::kName = |
+ "http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions"; |
+bool TransportSequenceNumber::IsSupportedFor(MediaType type) { |
+ return true; |
+} |
+ |
+bool TransportSequenceNumber::Parse(const uint8_t* data, uint16_t* value) { |
+ *value = ByteReader<uint16_t>::ReadBigEndian(data); |
+ return true; |
+} |
+ |
+bool TransportSequenceNumber::Write(uint8_t* data, uint16_t value) { |
+ ByteWriter<uint16_t>::WriteBigEndian(data, value); |
+ return true; |
+} |
+ |
+// Coordination of Video Orientation in RTP streams. |
+// |
+// Coordination of Video Orientation consists in signaling of the current |
+// orientation of the image captured on the sender side to the receiver for |
+// appropriate rendering and displaying. |
+// |
+// 0 1 |
+// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
+// | ID | len=0 |0 0 0 0 C F R R| |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
+const char* VideoOrientation::kName = "urn:3gpp:video-orientation"; |
+bool VideoOrientation::IsSupportedFor(MediaType type) { |
+ switch (type) { |
+ case MediaType::ANY: |
+ case MediaType::VIDEO: |
+ return true; |
+ case MediaType::AUDIO: |
+ case MediaType::DATA: |
+ return false; |
+ } |
+ RTC_NOTREACHED(); |
+ return false; |
+} |
+ |
+bool VideoOrientation::Parse(const uint8_t* data, VideoRotation* rotation) { |
+ *rotation = ConvertCVOByteToVideoRotation(data[0] & 0x03); |
+ return true; |
+} |
+ |
+bool VideoOrientation::Write(uint8_t* data, VideoRotation rotation) { |
+ data[0] = ConvertVideoRotationToCVOByte(rotation); |
+ return true; |
+} |
+ |
+bool VideoOrientation::Parse(const uint8_t* data, uint8_t* value) { |
+ *value = data[0]; |
+ return true; |
+} |
+ |
+bool VideoOrientation::Write(uint8_t* data, uint8_t value) { |
+ data[0] = value; |
+ return true; |
+} |
+} // namespace webrtc |