Matt Drown wrote:
>
> I don't have metadata running, was looking to grab the info from the
> json, but having some issues crafting up the correct messages, if anyone
> has this working, please let me know. I just want to extract current
> playing title/artist, and dump into a file.
>
> Hope this helps someone.
Here's something I hacked together a while back. Only requirement is
cJSON, which is a very basic json parser in C.
current.c:
Code:
--------------------
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h> /* socket, connect */
#include <netinet/in.h> /* struct sockaddr_in, struct sockaddr */
#include <netdb.h> /* struct hostent, gethostbyname */
#include "cJSON.h"
#include "lms.h"
void error(const char *msg) { perror(msg); exit(0); }
int post(char *host, int portno, char *q, char *buf, int buflen)
{
int i;
struct hostent *server;
struct sockaddr_in serv_addr;
int sockfd, bytes, sent, received, total, message_size;
char *message;
char *response = buf;
/* How big is the message? */
message_size=0;
message_size+=strlen("%s %s HTTP/1.0\r\nPOST /jsonrpc.js");
message_size+=strlen(q)+strlen("\r\n");
message_size+=strlen("Content-Length: %d\r\n")+10; /* content length */
message_size+=strlen("\r\n"); /* blank line */
/* allocate space for the message */
message=malloc(message_size);
/* fill in the parameters */
sprintf(message,"POST /jsonrpc.js HTTP/1.0\r\n");
sprintf(message+strlen(message),"Content-Length: %d\r\n",strlen(q));
strcat(message,"\r\n"); /* blank line */
strcat(message,q);
strcat(message,"\r\n");
/* create the socket */
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) error("ERROR opening socket");
/* lookup the ip address */
server = gethostbyname(host);
if (server == NULL) error("ERROR, no such host");
/* fill in the structure */
memset(&serv_addr,0,sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(portno);
memcpy(&serv_addr.sin_addr.s_addr,server->h_addr,server->h_length);
/* connect the socket */
if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
/* send the request */
total = strlen(message);
sent = 0;
do {
bytes = write(sockfd,message+sent,total-sent);
if (bytes < 0)
error("ERROR writing message to socket");
if (bytes == 0)
break;
sent+=bytes;
} while (sent < total);
/* receive the response */
memset(response,0,buflen);
total = buflen-1;
received = 0;
do {
bytes = read(sockfd,response+received,total-received);
if (bytes < 0)
error("ERROR reading response from socket");
if (bytes == 0)
break;
received+=bytes;
} while (received < total);
/*
* if the number of received bytes is the total size of the
* array then we have run out of space to store the response
* and it hasn't all arrived yet - so that's a bad thing
*/
if (received == total)
error("ERROR storing complete response from socket");
/* close the socket */
close(sockfd);
free(message);
return 0;
}
int main(void) {
char query[2048];
char param[1024];
char decoded[2048];
char *q = query;
char *p = param;
char *d = decoded;
char *r;
int arraylen, i;
int status = 1;
cJSON *results = NULL;
cJSON *result = NULL;
cJSON *items = NULL;
cJSON *item = NULL;
cJSON *json = NULL;
char *host = "192.168.68.121";
int port = 9000;
q = "{ \"id\": 1, \"method\": \"slim.request\", \"params\":
[\"4c:e1:73:42:26:0c\",[\"path\", \"?\"]]}";
post(host,port,q,decoded,2048);
r = strstr(decoded,"{");
strcpy(decoded,r);
json = cJSON_Parse(decoded);
if (json == NULL)
{
const char *error_ptr = cJSON_GetErrorPtr();
if (error_ptr != NULL)
{
fprintf(stderr, "Error before %s\n", error_ptr);
}
status = 0;
}
results = cJSON_GetObjectItemCaseSensitive(json, "result");
cJSON_ArrayForEach(result, results)
{
cJSON *path = cJSON_GetObjectItemCaseSensitive(result, "_path");
if (cJSON_IsString(result) && (result->valuestring != NULL))
{
p = result->valuestring;
}
else {
printf("Error getting path\n");
}
}
query[0] = '\0';
sprintf(query,"{\"method\":\"slim.request\",\"params\":[\"4c:e1:73:42:26:0c\",[\"songinfo\",0,99,\"url:%s\"]]}",p);
cJSON_Delete(json);
p = param;
post(host,port,query,decoded,2048);
r = strstr(decoded,"{");
strcpy(decoded,r);
json = cJSON_Parse(decoded);
if (json == NULL)
{
const char *error_ptr = cJSON_GetErrorPtr();
if (error_ptr != NULL)
{
fprintf(stderr, "Error before %s\n", error_ptr);
}
status = 0;
}
results = cJSON_GetObjectItem(json, "result");
items = cJSON_GetObjectItem(results, "songinfo_loop");
cJSON_ArrayForEach(item, items)
{
if (cJSON_IsString(item->child) && (item->child->valuestring != NULL))
{
printf("%s=%s\n", item->child->string,item->child->valuestring);
}
}
cJSON_Delete(json);
}
--------------------
lms.h:
Code:
--------------------
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct metadata {
char artist[1024];
char album[1024];
char title[1024];
char bitrate[30];
char type[30];
int new_title;
int new_album;
int new_artist;
int terminate;
int playing;
};
struct memory {
char *response;
size_t size;
};
int post(char *host, int portno, char *q, char *buf, int buflen);
void remove_char(char *str, char garbage);
int lms_query(char *query, char *decoded);
void *get_metadata(void *m);
--------------------
Compile:
gcc -o current current.c cJSON.c
Run:
./current
id=-561724432
title=Jazz Record Requests - New discoveries and evergreen classics
artist=Alyn Shipton presents jazz records of all styles as requested by
you, with music from Fats Waller, Anita O'Day and Miles Davis.
coverid=-561724432
duration=3540
coverart=0
type=BBCSounds
bitrate=96kbps CBR
year=0
channels=2
artwork_url=https://ichef.bbci.co.uk/images/ic/320x320/p09c8r13.jpg
remote_title=Play
samplerate=48000
piTouch™ w/JustBoom DigiHat -> RME ADI-2 DAC FS -> JBL 305P MkII
monitors; LMS 8.2 on piCorePlayer/Pi 4; Material Skin.
------------------------------------------------------------------------
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