Adding patch to adjust volume of TTS engine

OSS TTS engine has problems of low volume.
This patch adds the normalize function to OSS TTS engine.

Change-Id: I21c2c6d20bb9e8bef6f3b8ca1c8440baa7ffe2b8
Signed-off-by: Naoto Yamaguchi <i33399_YAMAGUCHI@aisin-aw.co.jp>

1 files changed, 31 insertions, 0 deletions

diff --git a/recipes-multimedia/hts_engine/hts-engine/nomalize.patch b/recipes-multimedia/hts_engine/hts-engine/nomalize.patch
new file mode 100644
index 000000000..e292fbb1c
--- /dev/null
+++ b/recipes-multimedia/hts_engine/hts-engine/nomalize.patch
@@ -0,0 +1,31 @@
+diff --git a/lib/HTS_engine.c b/lib/HTS_engine.c
+old mode 100644
+new mode 100755
+index 5325426..b507226
+--- a/lib/HTS_engine.c
++++ b/lib/HTS_engine.c
+@@ -733,6 +733,9 @@ void HTS_Engine_save_riff(HTS_Engine * engine, FILE * fp)
+    HTS_fwrite_little_endian(data_37_40, sizeof(char), 4, fp);
+    HTS_fwrite_little_endian(&data_41_44, sizeof(int), 1, fp);
+    /* write data */
++   
++   short peak = 0;
++   
+    for (i = 0; i < HTS_GStreamSet_get_total_nsamples(gss); i++) {
+       x = HTS_GStreamSet_get_speech(gss, i);
+       if (x > 32767.0)
+@@ -741,6 +744,14 @@ void HTS_Engine_save_riff(HTS_Engine * engine, FILE * fp)
+          temp = -32768;
+       else
+          temp = (short) x;
++      short sample = abs(temp);
++      if(peak < sample)
++         peak = sample;
++   }
++   float mul = (32767.0f / peak);
++   for (i = 0; i < HTS_GStreamSet_get_total_nsamples(gss); i++) {
++      x = HTS_GStreamSet_get_speech(gss, i);
++      temp = ((short) x) * mul;
+       HTS_fwrite_little_endian(&temp, sizeof(short), 1, fp);
+    }
+ }