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Diffstat (limited to 'src/modules/module-avb/aecp.c')
| -rw-r--r-- | src/modules/module-avb/aecp.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/modules/module-avb/aecp.c b/src/modules/module-avb/aecp.c new file mode 100644 index 0000000..d581f81 --- /dev/null +++ b/src/modules/module-avb/aecp.c @@ -0,0 +1,168 @@ +/* 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 "aecp.h" +#include "aecp-aem.h" +#include "internal.h" + +static const uint8_t mac[6] = AVB_BROADCAST_MAC; + +struct msg_info { + uint16_t type; + const char *name; + int (*handle) (struct aecp *aecp, const void *p, int len); +}; + +static int reply_not_implemented(struct aecp *aecp, const void *p, int len) +{ + struct server *server = aecp->server; + uint8_t buf[len]; + struct avb_ethernet_header *h = (void*)buf; + struct avb_packet_aecp_header *reply = SPA_PTROFF(h, sizeof(*h), void); + + memcpy(h, p, len); + AVB_PACKET_AECP_SET_STATUS(reply, AVB_AECP_STATUS_NOT_IMPLEMENTED); + + return avb_server_send_packet(server, h->src, AVB_TSN_ETH, buf, len); +} + +static const struct msg_info msg_info[] = { + { AVB_AECP_MESSAGE_TYPE_AEM_COMMAND, "aem-command", avb_aecp_aem_handle_command, }, + { AVB_AECP_MESSAGE_TYPE_AEM_RESPONSE, "aem-response", avb_aecp_aem_handle_response, }, + { AVB_AECP_MESSAGE_TYPE_ADDRESS_ACCESS_COMMAND, "address-access-command", NULL, }, + { AVB_AECP_MESSAGE_TYPE_ADDRESS_ACCESS_RESPONSE, "address-access-response", NULL, }, + { AVB_AECP_MESSAGE_TYPE_AVC_COMMAND, "avc-command", NULL, }, + { AVB_AECP_MESSAGE_TYPE_AVC_RESPONSE, "avc-response", NULL, }, + { AVB_AECP_MESSAGE_TYPE_VENDOR_UNIQUE_COMMAND, "vendor-unique-command", NULL, }, + { AVB_AECP_MESSAGE_TYPE_VENDOR_UNIQUE_RESPONSE, "vendor-unique-response", NULL, }, + { AVB_AECP_MESSAGE_TYPE_EXTENDED_COMMAND, "extended-command", NULL, }, + { AVB_AECP_MESSAGE_TYPE_EXTENDED_RESPONSE, "extended-response", NULL, }, +}; + +static inline const struct msg_info *find_msg_info(uint16_t type, const char *name) +{ + SPA_FOR_EACH_ELEMENT_VAR(msg_info, i) { + if ((name == NULL && type == i->type) || + (name != NULL && spa_streq(name, i->name))) + return i; + } + return NULL; +} + +static int aecp_message(void *data, uint64_t now, const void *message, int len) +{ + struct aecp *aecp = data; + struct server *server = aecp->server; + const struct avb_ethernet_header *h = message; + const struct avb_packet_aecp_header *p = SPA_PTROFF(h, sizeof(*h), void); + const struct msg_info *info; + int message_type; + + if (ntohs(h->type) != AVB_TSN_ETH) + return 0; + if (memcmp(h->dest, mac, 6) != 0 && + memcmp(h->dest, server->mac_addr, 6) != 0) + return 0; + if (AVB_PACKET_GET_SUBTYPE(&p->hdr) != AVB_SUBTYPE_AECP) + return 0; + + message_type = AVB_PACKET_AECP_GET_MESSAGE_TYPE(p); + + info = find_msg_info(message_type, NULL); + if (info == NULL) + return reply_not_implemented(aecp, message, len); + + pw_log_debug("got AECP message %s", info->name); + + if (info->handle == NULL) + return reply_not_implemented(aecp, message, len); + + return info->handle(aecp, message, len); +} + +static void aecp_destroy(void *data) +{ + struct aecp *aecp = data; + spa_hook_remove(&aecp->server_listener); + free(aecp); +} + +static int do_help(struct aecp *aecp, const char *args, FILE *out) +{ + fprintf(out, "{ \"type\": \"help\"," + "\"text\": \"" + "/adp/help: this help \\n" + "\" }"); + return 0; +} + +static int aecp_command(void *data, uint64_t now, const char *command, const char *args, FILE *out) +{ + struct aecp *aecp = data; + int res; + + if (!spa_strstartswith(command, "/aecp/")) + return 0; + + command += strlen("/aecp/"); + + if (spa_streq(command, "help")) + res = do_help(aecp, args, out); + else + res = -ENOTSUP; + + return res; +} + +static const struct server_events server_events = { + AVB_VERSION_SERVER_EVENTS, + .destroy = aecp_destroy, + .message = aecp_message, + .command = aecp_command +}; + +struct avb_aecp *avb_aecp_register(struct server *server) +{ + struct aecp *aecp; + + aecp = calloc(1, sizeof(*aecp)); + if (aecp == NULL) + return NULL; + + aecp->server = server; + + avdecc_server_add_listener(server, &aecp->server_listener, &server_events, aecp); + + return (struct avb_aecp*)aecp; +} + +void avb_aecp_unregister(struct avb_aecp *aecp) +{ + aecp_destroy(aecp); +} |