Index: webrtc/api/video/video_content_type.cc |
diff --git a/webrtc/api/video/video_content_type.cc b/webrtc/api/video/video_content_type.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..17577e6f86328c14322a1860e42cbdbc382272ee |
--- /dev/null |
+++ b/webrtc/api/video/video_content_type.cc |
@@ -0,0 +1,80 @@ |
+/* |
+ * Copyright (c) 2017 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/api/video/video_content_type.h" |
+ |
+// VideoContentType stored as a single byte, which is sent other the network. |
kwiberg-webrtc
2017/08/29 20:58:53
over
ilnik
2017/08/30 07:36:06
Done.
|
+// Structure: |
+// |
+// 0 1 2 3 4 5 6 7 |
+// +---------------+ |
+// |r r e e e s s c| |
+// |
+// where: |
+// r - reserved bits. |
+// e - 3-bit number of an experiment group counted from 1. 0 means there's no |
+// experiment ongoing. |
+// s - 2-bit simulcast stream id or spatial layer, counted from 1. 0 means that |
+// no simulcast information is set. |
+// c - content type. 0 means real-time video, 1 means screenshare. |
+// |
+static const uint8_t kScreenshareBitsMask = 0x01; |
+ |
+static const uint8_t kSimulcastShift = 1; |
+static const uint8_t kSimulcastBitsMask = 0x06; // 0b00000110 |
+static const uint8_t kSimulcastBitsSize = 2; |
+ |
+static const uint8_t kExperimentShift = 3; |
+static const uint8_t kExperimentBitsMask = 0x38; // 0b00111000 |
+static const uint8_t kExperimentBitsSize = 3; |
kwiberg-webrtc
2017/08/29 20:58:53
constexpr?
Also, put these in a namespace. An unn
ilnik
2017/08/30 07:36:06
Done.
|
+ |
+namespace webrtc { |
+namespace VideoContentTypeHelpers { |
+ |
+bool SetExperimentId(VideoContentType* content_type, uint8_t experiment_id) { |
+ // Store in bits 3-5. |
kwiberg-webrtc
2017/08/29 20:58:53
2-4
ilnik
2017/08/30 07:36:06
Done.
|
+ if (experiment_id >= (1 << kExperimentBitsSize)) |
+ return false; |
+ *content_type = static_cast<VideoContentType>( |
+ (static_cast<uint8_t>(*content_type) & ~kExperimentBitsMask) | |
+ ((experiment_id << kExperimentShift) & kExperimentBitsMask)); |
+ return true; |
+} |
+ |
+bool SetSimulcastId(VideoContentType* content_type, uint8_t simulcast_id) { |
+ // Store in bits 1-2. |
kwiberg-webrtc
2017/08/29 20:58:53
5-6
ilnik
2017/08/30 07:36:06
Done.
|
+ if (simulcast_id >= (1 << kSimulcastBitsSize)) |
+ return false; |
+ *content_type = static_cast<VideoContentType>( |
+ (static_cast<uint8_t>(*content_type) & ~kSimulcastBitsMask) | |
+ ((simulcast_id << kSimulcastShift) & kSimulcastBitsMask)); |
+ return true; |
+} |
+ |
+uint8_t GetExperimentId(const VideoContentType& content_type) { |
+ return (static_cast<uint8_t>(content_type) & kExperimentBitsMask) >> |
+ kExperimentShift; |
+} |
+uint8_t GetSimulcastId(const VideoContentType& content_type) { |
+ return (static_cast<uint8_t>(content_type) & kSimulcastBitsMask) >> |
+ kSimulcastShift; |
+} |
+ |
+bool IsScreenshare(const VideoContentType& content_type) { |
+ return (static_cast<uint8_t>(content_type) & kScreenshareBitsMask) > 0; |
+} |
+ |
+bool IsValidContentType(uint8_t value) { |
+ // Any 6-bit value is allowed. |
+ return value < (1 << 6); |
+} |
+ |
+} // namespace VideoContentTypeHelpers |
+} // namespace webrtc |