flac: added optimized converter for 16 bit

src/inputPlugins/_flac_common.c

@@ -219,6 +219,19 @@ static void flac_convert_stereo16(int16_t *dest,
 	}
 }
 
+static void
+flac_convert_16(int16_t *dest,
+		unsigned int num_channels,
+		const FLAC__int32 * const buf[],
+		unsigned int position, unsigned int end)
+{
+	unsigned int c_chan;
+
+	for (; position < end; ++position)
+		for (c_chan = 0; c_chan < num_channels; c_chan++)
+			*dest++ = buf[c_chan][position];
+}
+
 static void flac_convert(unsigned char *dest,
 			 unsigned int num_channels,
 			 unsigned int bytes_per_sample,
@@ -265,6 +278,10 @@ flac_common_write(FlacData *data, const FLAC__Frame * frame,
 			flac_convert_stereo16((int16_t*)data->chunk,
 					      buf, c_samp,
 					      c_samp + num_samples);
+		else if (bytes_per_sample == 2)
+			flac_convert_16((int16_t*)data->chunk,
+					num_channels, buf, c_samp,
+					c_samp + num_samples);
 		else
 			flac_convert(data->chunk,
 				     num_channels, bytes_per_sample, buf,