simple_live_transcode: Added left2mono, downmix2mono and normalize options

simple_live_transcode.c

@@ -18,7 +18,7 @@ static void copy_to_log(int fd)
 int main(int argc, char *argv[])
 {
 	int ret, canceled = 0, errpipe[2] = {-1, -1};
-	char *src, *dest;
+	char *src, *dest, *options, *afilter;
 	pid_t pid;
 	struct pollfd fds = {.fd = -1, .events = POLLIN};
 	if (argc != 5)
@@ -28,7 +28,15 @@ int main(int argc, char *argv[])
 	jobid = atoi(argv[1]);
 	src = jstr(jlookup(argv[4], "src"), "rtmp://127.0.0.1:999999/nourl");
 	dest = jstr(jlookup(argv[4], "destbase"), "rtmp://127.0.0.1:999999/nourl");
+	options = jlookup(argv[4], "options");
 
+	afilter = "";
+	if (jint(jlookup(options, "left2mono"), 0))
+		afilter = mprintf("%span=mono|c0=c0,", afilter);
+	else if (jint(jlookup(options, "downmix2mono"), 0))
+		afilter = mprintf("%span=mono|c0=0.5*c0+0.5*c1,", afilter);
+	if (jint(jlookup(options, "normalize"), 0))
+		afilter = mprintf("%sloudnorm,", afilter);
 	pipe(errpipe);
 	if (!(pid = fork()))
 	{
@@ -37,7 +45,8 @@ int main(int argc, char *argv[])
 		dup2(open("/dev/null", O_RDONLY|O_CLOEXEC), 0);
 		dup2(open("/dev/null", O_WRONLY|O_CLOEXEC), 1);
 		execlp("ffmpeg", "ffmpeg", "-nostats", "-i", src, "-filter_complex",
-				mprintf("[0:a]asplit=3[lowa][mida][higha]; movie=%s/video-logo-150px-trans.png,scale=w=100:h=100[logo]; [0:v]yadif,scale=1920:1080[tmp]; [tmp][logo]overlay=x=W-195:y=H-155,split=3[lowtmp][midtmp][high]; [lowtmp]scale=640:360[low]; [midtmp]scale=1280:720[mid]", getenv(WORKER_RAW)),
+				mprintf("[0:a]%sasplit=3[lowa][mida][higha]; movie=%s/video-logo-150px-trans.png,scale=w=100:h=100[logo]; [0:v]yadif,scale=1920:1080[tmp]; [tmp][logo]overlay=x=W-195:y=H-155,split=3[lowtmp][midtmp][high]; [lowtmp]scale=640:360[low]; [midtmp]scale=1280:720[mid]",
+				afilter, getenv(WORKER_RAW)),
 				"-map", "[low]", "-map", "[lowa]", OUTPUT_FORMAT("512k"), mprintf("%s_low", dest),
 				"-map", "[mid]", "-map", "[mida]", OUTPUT_FORMAT("2024k"), mprintf("%s_mid", dest),
 				"-map", "[high]", "-map", "[higha]", OUTPUT_FORMAT("6024k"), mprintf("%s_high", dest), 0);