new RTP 2250 header

ietf/rtp2250.h

@@ -0,0 +1,128 @@
+/*****************************************************************************
+ * rtp2250.h: Real-time Transport Protocol for MPEG-1/MPEG-2 audio/video
+ *****************************************************************************
+ * Copyright (C) 2016 VideoLAN
+ *
+ * Authors: Christophe Massiot <massiot@via.ecp.fr>
+ *
+ * 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 2250 RTP Payload Format for MPEG1/MPEG2 Video (January 1998)
+ */
+
+#ifndef __BITSTREAM_IETF_RTP2250_H__
+#define __BITSTREAM_IETF_RTP2250_H__
+
+#include <stdint.h>   /* uint8_t, uint16_t, etc... */
+#include <stdbool.h>  /* bool */
+
+#include <bitstream/ietf/rtp.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/*
+ * Reminder : MPEG video-specific header
+    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
+   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   |    MBZ  |T|         TR        | |N|S|B|E|  P  | | BFC | | FFC |
+   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                                   AN              FBV     FFV
+ */
+
+#define RTP2250V_HEADER_SIZE 4
+
+static inline void rtp2250v_set_hdr(uint8_t *p_rtpv)
+{
+    p_rtpv[0] = 0x0;
+    p_rtpv[1] = 0x0;
+    p_rtpv[2] = 0x0;
+    p_rtpv[3] = 0x0;
+}
+
+static inline bool rtp2250v_check_hdr(const uint8_t *p_rtpv)
+{
+    return (p_rtpv[0] & 0xf8) == 0x0;
+}
+
+static inline void rtp2250v_set_mpeg2(uint8_t *p_rtpv)
+{
+    p_rtpv[0] |= 0x4;
+}
+
+static inline bool rtp2250v_check_mpeg2(const uint8_t *p_rtpv)
+{
+    return !!(p_rtpv[0] & 0x4);
+}
+
+/*
+ * Reminder : MPEG-2 video-specific header extension
+    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
+   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   |X|E|f_[0,0]|f_[0,1]|f_[1,0]|f_[1,1]| DC| PS|T|P|C|Q|V|A|R|H|G|D|
+   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+#define RTP2250VX_HEADER_SIZE 4
+
+static inline void rtp2250v_set_mpeg2_hdr(uint8_t *p_rtpv)
+{
+    p_rtpv[4] = 0x0;
+    p_rtpv[5] = 0x0;
+    p_rtpv[6] = 0x0;
+    p_rtpv[7] = 0x0;
+}
+
+/*
+ * Reminder : MPEG Audio-specific header
+    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
+   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   |             MBZ               |          Frag_offset          |
+   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+#define RTP2250A_HEADER_SIZE 4
+
+static inline void rtp2250a_set_hdr(uint8_t *p_rtpa)
+{
+    p_rtpa[0] = 0x0;
+    p_rtpa[1] = 0x0;
+    p_rtpa[2] = 0x0;
+    p_rtpa[3] = 0x0;
+}
+
+static inline bool rtp2250a_check_hdr(const uint8_t *p_rtpa)
+{
+    return p_rtpa[0] == 0x0 && p_rtpa[1] == 0x0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif