interaudiosrc: make silence memory actually contain silence

instead of random data. Reported by Marco Micheletti on
gstreamer-devel.

2 files changed, 20 insertions, 5 deletions

diff --git a/gst/inter/gstinteraudiosrc.c b/gst/inter/gstinteraudiosrc.c
index 3e55be260..d800e960d 100644
--- a/gst/inter/gstinteraudiosrc.c
+++ b/gst/inter/gstinteraudiosrc.c
@@ -187,6 +187,7 @@ gst_inter_audio_src_set_caps (GstBaseSrc * src, GstCaps * caps)
 {
   GstInterAudioSrc *interaudiosrc = GST_INTER_AUDIO_SRC (src);
   const GstStructure *structure;
+  GstAudioInfo info;
   gboolean ret;
   int sample_rate;
 
@@ -201,6 +202,10 @@ gst_inter_audio_src_set_caps (GstBaseSrc * src, GstCaps * caps)
     ret = gst_pad_set_caps (src->srcpad, caps);
   }
 
+  if (gst_audio_info_from_caps (&info, caps)) {
+    interaudiosrc->finfo = info.finfo;
+  }
+
   return ret;
 }
 
@@ -226,6 +231,7 @@ gst_inter_audio_src_stop (GstBaseSrc * src)
 
   gst_inter_surface_unref (interaudiosrc->surface);
   interaudiosrc->surface = NULL;
+  interaudiosrc->finfo = NULL;
 
   return TRUE;
 }
@@ -284,17 +290,23 @@ gst_inter_audio_src_create (GstBaseSrc * src, guint64 offset, guint size,
   if (n > 0) {
     buffer = gst_adapter_take_buffer (interaudiosrc->surface->audio_adapter,
         n * 4);
+  } else {
+    buffer = gst_buffer_new ();
   }
   g_mutex_unlock (interaudiosrc->surface->mutex);
 
   if (n < SIZE) {
-    GstBuffer *newbuf = gst_buffer_new_and_alloc ((SIZE - n) * 4);
+    GstMapInfo map;
+    GstMemory *mem;
 
     GST_WARNING ("creating %d samples of silence", SIZE - n);
-
-    if (buffer)
-      newbuf = gst_buffer_append (newbuf, buffer);
-    buffer = newbuf;
+    mem = gst_allocator_alloc (NULL, (SIZE - n) * 4, NULL);
+    if (gst_memory_map (mem, &map, GST_MAP_WRITE)) {
+      gst_audio_format_fill_silence (interaudiosrc->finfo, map.data, map.size);
+      gst_memory_unmap (mem, &map);
+    }
+    buffer = gst_buffer_make_writable (buffer);
+    gst_buffer_prepend_memory (buffer, mem);
   }
   n = SIZE;
 
diff --git a/gst/inter/gstinteraudiosrc.h b/gst/inter/gstinteraudiosrc.h
index 4ccc7f5c5..2c46f8302 100644
--- a/gst/inter/gstinteraudiosrc.h
+++ b/gst/inter/gstinteraudiosrc.h
@@ -21,6 +21,7 @@
 #define _GST_INTER_AUDIO_SRC_H_
 
 #include <gst/base/gstbasesrc.h>
+#include <gst/audio/audio.h>
 #include "gstintersurface.h"
 
 G_BEGIN_DECLS
@@ -43,6 +44,8 @@ struct _GstInterAudioSrc
 
   guint64 n_samples;
   int sample_rate;
+
+  const GstAudioFormatInfo *finfo;
 };
 
 struct _GstInterAudioSrcClass