From 08f8a684919ae05a3be6365bc69c5b3cfa57cc17 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Tue, 29 Mar 2016 21:23:13 +0200
Subject: Fix libtoolame-dab PAD insertion

---
 libtoolame-dab/toolame.c |  9 ++++++---
 libtoolame-dab/toolame.h |  2 ++
 src/dabplus-enc.cpp      | 19 ++++++++++++++-----
 3 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/libtoolame-dab/toolame.c b/libtoolame-dab/toolame.c
index 02cedf6..7dc5aa5 100644
--- a/libtoolame-dab/toolame.c
+++ b/libtoolame-dab/toolame.c
@@ -88,7 +88,6 @@ void global_init (void)
 static frame_info frame;
 static frame_header header;
 static int frameNum;
-static int xpad_len;
 static int psycount;
 static int model;
 static unsigned int crc;
@@ -257,12 +256,15 @@ int toolame_set_samplerate(long sample_rate)
 
 int toolame_set_pad(int pad_len)
 {
-    header.dab_length = pad_len;
-    if (header.dab_length <= 0) {
+    if (pad_len < 0) {
         fprintf(stderr, "Invalid XPAD length specified\n");
         return 1;
     }
 
+    if (pad_len) {
+        header.dab_length = pad_len;
+    }
+
     return 0;
 }
 
@@ -272,6 +274,7 @@ static int encode_first_call = 1;
 int toolame_encode_frame(
         short buffer[2][1152],
         unsigned char *xpad_data,
+        size_t xpad_len,
         unsigned char *output_buffer,
         size_t output_buffer_size)
 {
diff --git a/libtoolame-dab/toolame.h b/libtoolame-dab/toolame.h
index 1c29e24..5450ca0 100644
--- a/libtoolame-dab/toolame.h
+++ b/libtoolame-dab/toolame.h
@@ -1,5 +1,6 @@
 #ifndef __TOOLAME_H_
 #define __TOOLAME_H_
+#include <stdlib.h>
 
 /* All exported functions shown here return zero
  * on success */
@@ -38,6 +39,7 @@ int toolame_set_pad(int pad_len);
 int toolame_encode_frame(
         short buffer[2][1152],
         unsigned char *xpad_data,
+        size_t xpad_len,
         unsigned char *output_buffer,
         size_t output_buffer_size);
 
diff --git a/src/dabplus-enc.cpp b/src/dabplus-enc.cpp
index 3813041..1b351aa 100644
--- a/src/dabplus-enc.cpp
+++ b/src/dabplus-enc.cpp
@@ -673,13 +673,15 @@ int main(int argc, char *argv[])
             err = toolame_set_channel_mode(dab_channel_mode);
         }
 
+        if (err == 0) {
+            err = toolame_set_pad(padlen);
+        }
+
         if (err) {
             fprintf(stderr, "libtoolame-dab init failed: %d\n", err);
             return err;
         }
 
-        // TODO int toolame_set_pad(int pad_len);
-
         input_buf.resize(2 * 1152 * BYTES_PER_SAMPLE);
     }
 
@@ -1050,8 +1052,15 @@ int main(int argc, char *argv[])
             numOutBytes = out_args.numOutBytes;
         }
         else if (selected_encoder == encoder_selection_t::toolame_dab) {
-            const int calculated_padlen = ret > 0 ? pad_buf[padlen] : 0;
-            uint8_t *xpad_data = pad_buf + (padlen - calculated_padlen); // offset due to unused PAD bytes
+            int calculated_padlen = 0;
+            if (ret == padlen + 1) {
+                calculated_padlen = pad_buf[padlen];
+                if (calculated_padlen <= 2) {
+                    stringstream ss;
+                    ss << "Invalid XPAD Length " << calculated_padlen;
+                    throw runtime_error(ss.str());
+                }
+            }
 
             short input_buffers[2][1152];
 
@@ -1072,7 +1081,7 @@ int main(int argc, char *argv[])
             }
 
             if (read_bytes) {
-                numOutBytes = toolame_encode_frame(input_buffers, xpad_data, &outbuf[0], outbuf.size());
+                numOutBytes = toolame_encode_frame(input_buffers, pad_buf, calculated_padlen, &outbuf[0], outbuf.size());
             }
             else {
                 numOutBytes = toolame_finish(&outbuf[0], outbuf.size());
-- 
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