avb: use descriptors for ADP

Remove some of the json parsing for now, work with descriptors.
Remove some parsing code.
Implement GET_AVB_INFO.
Keep descriptors in a list.
Add some utils.

src/modules/module-avbtp/acmp.c

@@ -0,0 +1,167 @@
+/* AVB support
+ *
+ * Copyright © 2022 Wim Taymans
+ *
+ * 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 (including the next
+ * paragraph) 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.
+ */
+
+#include <spa/utils/json.h>
+#include <spa/debug/mem.h>
+
+#include <pipewire/pipewire.h>
+
+#include "acmp.h"
+#include "internal.h"
+
+struct acmp {
+	struct server *server;
+	struct spa_hook server_listener;
+};
+
+struct msg_info {
+	uint16_t type;
+	const char *name;
+	int (*handle) (struct acmp *acmp, const void *p, int len);
+};
+
+static int reply_not_supported(struct acmp *acmp, const void *p, int len)
+{
+	struct server *server = acmp->server;
+	uint8_t buf[len];
+	struct avbtp_packet_acmp *reply = (struct avbtp_packet_acmp*)buf;
+
+	memcpy(reply, p, len);
+	AVBTP_PACKET_ACMP_SET_STATUS(reply, AVBTP_ACMP_STATUS_NOT_SUPPORTED);
+
+	return avbtp_server_send_packet(server, reply->hdr.eth.src, reply, len);
+}
+
+static const struct msg_info msg_info[] = {
+	{ AVBTP_ACMP_MESSAGE_TYPE_CONNECT_TX_COMMAND, "connect-tx-command", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_CONNECT_TX_RESPONSE, "connect-tx-response", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_DISCONNECT_TX_COMMAND, "disconnect-tx-command", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_DISCONNECT_TX_RESPONSE, "disconnect-tx-response", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_GET_TX_STATE_COMMAND, "get-tx-state-command", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_GET_TX_STATE_RESPONSE, "get-tx-state-response", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_CONNECT_RX_COMMAND, "connect-rx-command", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_CONNECT_RX_RESPONSE, "connect-rx-response", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_DISCONNECT_RX_COMMAND, "disconnect-rx-command", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_DISCONNECT_RX_RESPONSE, "disconnect-rx-response", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_GET_RX_STATE_COMMAND, "get-rx-state-command", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_GET_RX_STATE_RESPONSE, "get-rx-state-response", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_GET_TX_CONNECTION_COMMAND, "get-tx-connection-command", NULL, },
+	{ AVBTP_ACMP_MESSAGE_TYPE_GET_TX_CONNECTION_RESPONSE, "get-tx-connection-response", NULL, },
+};
+
+static inline const struct msg_info *find_msg_info(uint16_t type, const char *name)
+{
+	uint32_t i;
+	for (i = 0; i < SPA_N_ELEMENTS(msg_info); i++) {
+		if ((name == NULL && type == msg_info[i].type) ||
+		    (name != NULL && spa_streq(name, msg_info[i].name)))
+			return &msg_info[i];
+	}
+	return NULL;
+}
+
+static int acmp_message(void *data, uint64_t now, const void *message, int len)
+{
+	struct acmp *acmp = data;
+	const struct avbtp_packet_acmp *p = message;
+	const struct msg_info *info;
+	int message_type;
+
+	if (AVBTP_PACKET_GET_SUBTYPE(&p->hdr) != AVBTP_SUBTYPE_ACMP)
+		return 0;
+
+	message_type = AVBTP_PACKET_ACMP_GET_MESSAGE_TYPE(p);
+
+	info = find_msg_info(message_type, NULL);
+	if (info == NULL)
+		return reply_not_supported(acmp, p, len);
+
+	pw_log_info("got ACMP message %s", info->name);
+
+	if (info->handle == NULL)
+		return reply_not_supported(acmp, p, len);
+
+	return info->handle(acmp, p, len);
+}
+
+static void acmp_destroy(void *data)
+{
+	struct acmp *acmp = data;
+	spa_hook_remove(&acmp->server_listener);
+	free(acmp);
+}
+
+static int do_help(struct acmp *acmp, const char *args, FILE *out)
+{
+	fprintf(out, "{ \"type\": \"help\","
+			"\"text\": \""
+			  "/adp/help: this help \\n"
+			"\" }");
+	return 0;
+}
+
+static int acmp_command(void *data, uint64_t now, const char *command, const char *args, FILE *out)
+{
+	struct acmp *acmp = data;
+	int res;
+
+	if (!spa_strstartswith(command, "/acmp/"))
+		return 0;
+
+	command += strlen("/acmp/");
+
+	if (spa_streq(command, "help"))
+		res = do_help(acmp, args, out);
+	else
+		res = -ENOTSUP;
+
+	return res;
+}
+
+static const struct server_events server_events = {
+	AVBTP_VERSION_SERVER_EVENTS,
+	.destroy = acmp_destroy,
+	.message = acmp_message,
+	.command = acmp_command
+};
+
+struct avbtp_acmp *avbtp_acmp_register(struct server *server)
+{
+	struct acmp *acmp;
+
+	acmp = calloc(1, sizeof(*acmp));
+	if (acmp == NULL)
+		return NULL;
+
+	acmp->server = server;
+
+	avdecc_server_add_listener(server, &acmp->server_listener, &server_events, acmp);
+
+	return (struct avbtp_acmp*)acmp;
+}
+
+void avbtp_acmp_unregister(struct avbtp_acmp *acmp)
+{
+	acmp_destroy(acmp);
+}