av1: depacketizer

include/re_av1.h

@@ -42,3 +42,14 @@ typedef int (av1_packet_h)(bool marker, uint64_t rtp_ts,
 int av1_packetize(bool *newp, bool marker, uint64_t rtp_ts,
 		  const uint8_t *buf, size_t len, size_t maxlen,
 		  av1_packet_h *pkth, void *arg);
+
+
+/** AV1 Aggregation Header */
+struct av1_aggr_hdr {
+	unsigned z:1;  /* continuation of an OBU fragment from prev packet  */
+	unsigned y:1;  /* last OBU element will continue in the next packet */
+	unsigned w:2;  /* number of OBU elements in the packet              */
+	unsigned n:1;  /* first packet of a coded video sequence            */
+};
+
+int av1_aggr_hdr_decode(struct av1_aggr_hdr *hdr, struct mbuf *mb);

src/av1/depack.c

@@ -0,0 +1,33 @@
+/**
+ * @file av1/depack.c AV1 De-packetizer
+ *
+ * Copyright (C) 2010 - 2022 Alfred E. Heggestad
+ */
+
+#include <string.h>
+#include <re_types.h>
+#include <re_mbuf.h>
+#include <re_av1.h>
+
+
+int av1_aggr_hdr_decode(struct av1_aggr_hdr *hdr, struct mbuf *mb)
+{
+	uint8_t v;
+
+	if (!hdr || !mb)
+		return EINVAL;
+
+	memset(hdr, 0, sizeof(*hdr));
+
+	if (mbuf_get_left(mb) < 1)
+		return EBADMSG;
+
+	v = mbuf_read_u8(mb);
+
+	hdr->z = v>>7 & 0x1;
+	hdr->y = v>>6 & 0x1;
+	hdr->w = v>>4 & 0x3;
+	hdr->n = v>>3 & 0x1;
+
+	return 0;
+}

src/av1/mod.mk

@@ -6,3 +6,4 @@
 
 SRCS	+= av1/obu.c
 SRCS	+= av1/pkt.c
+SRCS	+= av1/depack.c