1 files changed, 88 insertions, 0 deletions
diff --git a/libtoolame-dab/xpad.c b/libtoolame-dab/xpad.c
new file mode 100644
index 0000000..6c97ea8
--- /dev/null
+++ b/libtoolame-dab/xpad.c
@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "xpad.h"
+
+static int xpad_fd = 0;
+
+/* The F-PAD has to be:
+    uint16_t fpad = 0x2; // CI flag
+
+    if (xpad_len()) {
+        fpad |= 1<<13; // variable length X-PAD
+    }
+
+   which is included by mot-encoder in the file/fifo
+   it generates
+   */
+
+/* Create and open the desired PAD input fifo
+ */
+int xpad_init(char* pad_fifo, int pad_len)
+{
+    if (mkfifo(pad_fifo, S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH) != 0) {
+        if (errno != EEXIST) {
+            fprintf(stderr, "Can't create pad file: %d!\n", errno);
+            return -1;
+        }
+    }
+
+    xpad_fd = open(pad_fifo, O_RDONLY | O_NONBLOCK);
+    if (xpad_fd == -1) {
+        fprintf(stderr, "Can't open pad file!\n");
+        return -1;
+    }
+
+    int flags = fcntl(xpad_fd, F_GETFL, 0);
+    if (fcntl(xpad_fd, F_SETFL, flags | O_NONBLOCK)) {
+        fprintf(stderr, "Can't set non-blocking mode in pad file!\n");
+        return -1;
+    }
+
+    return 0;
+}
+
+int xpad_read_len(uint8_t* buf, int len)
+{
+    if (xpad_fd == 0) return 0;
+
+    ssize_t num_read = 0;
+
+    while (num_read < len) {
+        ssize_t r = read(xpad_fd, buf + num_read, len - num_read);
+
+        if(r < 0) {
+            if (errno == EAGAIN) {
+                return 0;
+            }
+            else {
+                perror("PAD input read error");
+                return -1;
+            }
+        }
+        else if (r == 0) {
+            // reached end of data
+            return 0;
+        }
+
+        num_read += r;
+    }
+
+#if XPAD_DEBUG
+    int i;
+    for (i = 0; i < len; i++) {
+        fprintf(stderr, "%02x ", buf[i]);
+    }
+    fprintf(stderr, "\n");
+#endif
+
+    return num_read;
+}
+