Add IETF RFC 4175 Payload Header bitstream writer

Signed-off-by: Rostislav Pehlivanov <rpehlivanov@obe.tv>

ietf/rfc4175.h

@@ -0,0 +1,182 @@
+/*****************************************************************************
+ * rfc4175.h: RFC Profile for uncompressed video
+ *****************************************************************************
+ * Copyright (C) 2016 Open Broadcast Systems Ltd.
+ *
+ * Authors: Rostislav Pehlivanov <rpehlivanov@obe.tv>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject
+ * to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *****************************************************************************/
+
+/*
+ * Normative references:
+ *  - IETF RFC 4175 Uncompressed
+ */
+
+#ifndef __BITSTREAM_IETF_RFC4175_H__
+#define __BITSTREAM_IETF_RFC4175_H__
+
+#include <stdint.h>   /* uint8_t, uint16_t, etc... */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/*  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |   Extended Sequence Number    |            Length             |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |F|          Line No            |C|           Offset            |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |            Length             |F|          Line No            |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |C|           Offset            |                               .
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               .
+ * .                                                               .
+ * .                 Two (partial) lines of video data             .
+ * .                                                               .
+ * +---------------------------------------------------------------+
+ */
+
+
+static inline void rfc4175_set_extended_sequence_number(uint8_t *buf, uint16_t number)
+{
+    buf[0] = (number >> 8) & 0xff;
+    buf[1] = number & 0xff;
+}
+
+static inline uint16_t rfc4175_get_extended_sequence_number(uint8_t *buf)
+{
+    return (buf[0] << 8) | buf[1];
+}
+
+static inline void rfc4175_set_line_1_length(uint8_t *buf, uint16_t length)
+{
+    buf[2] = (length >> 8) & 0xff;
+    buf[3] = length & 0xff;
+}
+
+static inline uint16_t rfc4175_get_line_1_length(uint8_t *buf)
+{
+    return (buf[2] << 8) | buf[3];
+}
+
+static inline void rfc4175_set_line_1_field_id(uint8_t *buf, uint8_t id)
+{
+    buf[4] |= (!!id) << 7;
+}
+
+static inline uint8_t rfc4175_get_line_1_field_id(uint8_t *buf)
+{
+    return buf[4] >> 7;
+}
+
+static inline void rfc4175_set_line_1_number(uint8_t *buf, uint16_t number)
+{
+    buf[4] |= (number >> 8) & 0x80;
+    buf[5]  = number & 0xff;
+}
+
+static inline uint16_t rfc4175_get_line_1_number(uint8_t *buf)
+{
+    return ((buf[4] & 0x80) << 8) | buf[5];
+}
+
+static inline void rfc4175_set_line_1_continuation(uint8_t *buf, uint8_t continuation)
+{
+    buf[6] |= (!!continuation) << 7;
+}
+
+static inline uint8_t rfc4175_get_line_1_continuation(uint8_t *buf)
+{
+    return buf[6] >> 7;
+}
+
+static inline void rfc4175_set_line_1_offset(uint8_t *buf, uint16_t offset)
+{
+    buf[6] |= (offset >> 8) & 0x80;
+    buf[7]  = offset & 0xff;
+}
+
+static inline uint16_t rfc4175_get_line_1_offset(uint8_t *buf)
+{
+    return ((buf[6] & 0x80) << 8) | buf[7];
+}
+
+static inline void rfc4175_set_line_2_length(uint8_t *buf, uint16_t length)
+{
+    buf[8] = (length >> 8) & 0xff;
+    buf[9] = length & 0xff;
+}
+
+static inline uint16_t rfc4175_get_line_2_length(uint8_t *buf)
+{
+    return (buf[8] << 8) | buf[9];
+}
+
+static inline void rfc4175_set_line_2_field_id(uint8_t *buf, uint8_t id)
+{
+    buf[10] |= (!!id) << 7;
+}
+
+static inline uint8_t rfc4175_get_line_2_field_id(uint8_t *buf)
+{
+    return buf[10] >> 7;
+}
+
+static inline void rfc4175_set_line_2_number(uint8_t *buf, uint16_t number)
+{
+    buf[11] |= (number >> 8) & 0x80;
+    buf[12]  = number & 0xff;
+}
+
+static inline uint16_t rfc4175_get_line_2_number(uint8_t *buf)
+{
+    return ((buf[11] & 0x80) << 8) | buf[12];
+}
+
+static inline void rfc4175_set_line_2_continuation(uint8_t *buf, uint8_t continuation)
+{
+    buf[13] |= (!!continuation) << 7;
+}
+
+static inline uint8_t rfc4175_get_line_2_continuation(uint8_t *buf)
+{
+    return buf[13] >> 7;
+}
+
+static inline void rfc4175_set_line_2_offset(uint8_t *buf, uint16_t offset)
+{
+    buf[13] |= (offset >> 8) & 0x80;
+    buf[14]  = offset & 0xff;
+}
+
+static inline uint16_t rfc4175_get_line_2_offset(uint8_t *buf)
+{
+    return ((buf[13] & 0x80) << 8) | buf[14];
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif