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-rw-r--r--dom/media/webrtc/common/YuvStamper.h77
1 files changed, 77 insertions, 0 deletions
diff --git a/dom/media/webrtc/common/YuvStamper.h b/dom/media/webrtc/common/YuvStamper.h
new file mode 100644
index 0000000000..f355055cd9
--- /dev/null
+++ b/dom/media/webrtc/common/YuvStamper.h
@@ -0,0 +1,77 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef YUV_STAMPER_H_
+#define YUV_STAMPER_H_
+
+#include <cstdint>
+
+namespace mozilla {
+
+class YuvStamper {
+ public:
+ bool WriteDigits(uint32_t value);
+
+ template <typename T>
+ static bool Write(uint32_t width, uint32_t height, uint32_t stride,
+ unsigned char* pYData, const T& value, uint32_t x = 0,
+ uint32_t y = 0) {
+ YuvStamper stamper(pYData, width, height, stride, x, y,
+ (sDigitWidth + sInterDigit) * sPixelSize,
+ (sDigitHeight + sInterLine) * sPixelSize);
+ return stamper.WriteDigits(value);
+ }
+
+ static bool Encode(uint32_t width, uint32_t height, uint32_t stride,
+ unsigned char* pYData, unsigned char* pMsg, size_t msg_len,
+ uint32_t x = 0, uint32_t y = 0);
+
+ static bool Decode(uint32_t width, uint32_t height, uint32_t stride,
+ unsigned char* pYData, unsigned char* pMsg, size_t msg_len,
+ uint32_t x = 0, uint32_t y = 0);
+
+ private:
+ YuvStamper(unsigned char* pYData, uint32_t width, uint32_t height,
+ uint32_t stride, uint32_t x, uint32_t y,
+ unsigned char symbol_width, unsigned char symbol_height);
+
+ bool WriteDigit(unsigned char digit);
+ void WritePixel(unsigned char* data, uint32_t x, uint32_t y);
+ uint32_t Capacity();
+ bool AdvanceCursor();
+ bool WriteBit(bool one);
+ bool Write8(unsigned char value);
+ bool ReadBit(unsigned char& value);
+ bool Read8(unsigned char& bit);
+
+ const static unsigned char sPixelSize = 3;
+ const static unsigned char sDigitWidth = 6;
+ const static unsigned char sDigitHeight = 7;
+ const static unsigned char sInterDigit = 1;
+ const static unsigned char sInterLine = 1;
+ const static uint32_t sBitSize = 4;
+ const static uint32_t sBitThreshold = 60;
+ const static unsigned char sYOn = 0x80;
+ const static unsigned char sYOff = 0;
+ const static unsigned char sLumaThreshold = 96;
+ const static unsigned char sLumaMin = 16;
+ const static unsigned char sLumaMax = 235;
+
+ unsigned char* pYData;
+ uint32_t mStride;
+ uint32_t mWidth;
+ uint32_t mHeight;
+ unsigned char mSymbolWidth;
+ unsigned char mSymbolHeight;
+
+ struct Cursor {
+ Cursor(uint32_t x, uint32_t y) : x(x), y(y) {}
+ uint32_t x;
+ uint32_t y;
+ } mCursor;
+};
+
+} // namespace mozilla
+
+#endif