From 2cc628e460c86087ee5de7c455a864326529695d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C3=ABl=20Carr=C3=A9?= <funman@videolan.org>
Date: Fri, 13 May 2016 15:52:12 +0200
Subject: [PATCH] Add RTCP FeedBack

---
 ietf/rtcp_fb.h | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 ietf/rtcp_fb.h

diff --git a/ietf/rtcp_fb.h b/ietf/rtcp_fb.h
new file mode 100644
index 0000000..9ac5ebc
--- /dev/null
+++ b/ietf/rtcp_fb.h
@@ -0,0 +1,84 @@
+#ifndef __BITSTREAM_IETF_RTCP_FB_H__
+# define __BITSTREAM_IETF_RTCP_FB_H__
+
+# include <inttypes.h>
+
+# define RTCP_PT_RTPFB             205
+# define RTCP_PT_PSFB              206
+
+# define RTCP_PT_RTPFB_GENERIC_NACK 1
+
+# define RTCP_FB_HEADER_SIZE 12
+# define RTCP_FB_FCI_GENERIC_NACK_SIZE 4
+
+static inline void rtcp_fb_set_fmt(uint8_t *p_rtcp, uint8_t fmt)
+{
+    p_rtcp[0] |= fmt & 0x1f;
+}
+
+static inline uint8_t rtcp_fb_get_fmt(const uint8_t *p_rtcp)
+{
+    return p_rtcp[0] & 0x1f;
+}
+
+static inline void rtcp_fb_set_ssrc_pkt_sender(uint8_t *p_rtcp_fb,
+                                               const uint8_t pi_ssrc[4])
+{
+    p_rtcp_fb[4] = pi_ssrc[0];
+    p_rtcp_fb[5] = pi_ssrc[1];
+    p_rtcp_fb[6] = pi_ssrc[2];
+    p_rtcp_fb[7] = pi_ssrc[3];
+}
+
+static inline void rtcp_fb_set_ssrc_media_src(uint8_t *p_rtcp_fb,
+                                              const uint8_t pi_ssrc[4])
+{
+    p_rtcp_fb[8] = pi_ssrc[0];
+    p_rtcp_fb[9] = pi_ssrc[1];
+    p_rtcp_fb[10] = pi_ssrc[2];
+    p_rtcp_fb[11] = pi_ssrc[3];
+}
+
+static inline void rtcp_fb_get_ssrc_pkt_sender(const uint8_t *p_rtcp_fb,
+                                               uint8_t pi_ssrc[4])
+{
+    pi_ssrc[0] = p_rtcp_fb[4];
+    pi_ssrc[1] = p_rtcp_fb[5];
+    pi_ssrc[2] = p_rtcp_fb[6];
+    pi_ssrc[3] = p_rtcp_fb[7];
+}
+
+static inline void rtcp_fb_get_ssrc_media_src(const uint8_t *p_rtcp_fb,
+                                              uint8_t pi_ssrc[4])
+{
+    pi_ssrc[0] = p_rtcp_fb[8];
+    pi_ssrc[1] = p_rtcp_fb[9];
+    pi_ssrc[2] = p_rtcp_fb[10];
+    pi_ssrc[3] = p_rtcp_fb[11];
+}
+
+static inline void rtcp_fb_nack_set_packet_id(uint8_t *p_rtcp_fb_nack,
+                                              uint16_t packet_id)
+{
+    p_rtcp_fb_nack[0] = (packet_id >> 8) & 0xff;
+    p_rtcp_fb_nack[1] = packet_id & 0xff;
+}
+
+static inline uint16_t rtcp_fb_nack_get_packet_id(const uint8_t *p_rtcp_fb_nack)
+{
+    return (p_rtcp_fb_nack[0] << 8) | p_rtcp_fb_nack[1];
+}
+
+static inline uint16_t rtcp_fb_nack_get_bitmask_lost(const uint8_t *p_rtcp_fb_nack)
+{
+    return (p_rtcp_fb_nack[2] << 8) | p_rtcp_fb_nack[3];
+}
+
+static inline void rtcp_fb_nack_set_bitmask_lost(uint8_t *p_rtcp_fb_nack,
+                                                 uint16_t bitmask)
+{
+    p_rtcp_fb_nack[2] = (bitmask >> 8) & 0xff;
+    p_rtcp_fb_nack[3] = bitmask & 0xff;
+}
+
+#endif /* !__BITSTREAM_IETF_RTCP_FB_H__ */