samplefmt: make av_samples_alloc() initialize the data to silence.

Right now the buffer is zeroed, which does not represent silence for U8(P).

libavutil/samplefmt.c

@@ -174,7 +174,7 @@ int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
     if (size < 0)
         return size;
 
-    buf = av_mallocz(size);
+    buf = av_malloc(size);
     if (!buf)
         return AVERROR(ENOMEM);
 
@@ -184,6 +184,9 @@ int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
         av_free(buf);
         return size;
     }
+
+    av_samples_set_silence(audio_data, 0, nb_samples, nb_channels, sample_fmt);
+
     return 0;
 }
 

libavutil/samplefmt.h

@@ -182,6 +182,7 @@ int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
  * Allocate a samples buffer for nb_samples samples, and fill data pointers and
  * linesize accordingly.
  * The allocated samples buffer can be freed by using av_freep(&audio_data[0])
+ * Allocated data will be initialized to silence.
  *
  * @see enum AVSampleFormat
  * The documentation for AVSampleFormat describes the data layout.

libavutil/version.h

@@ -38,7 +38,7 @@
 
 #define LIBAVUTIL_VERSION_MAJOR 51
 #define LIBAVUTIL_VERSION_MINOR 41
-#define LIBAVUTIL_VERSION_MICRO  0
+#define LIBAVUTIL_VERSION_MICRO  1
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \