sampleconv.h: Use lrint() instead of lround().

lrint() is faster. Also put parentheses around macro arguments.

Author: bmc0

sampleconv.c

@@ -111,9 +111,9 @@ void read_buf_s24_3(void *in, sample_t *out, ssize_t s)
 	int32_t v;
 	uint8_t *inn = (uint8_t *) in;
 	while (s-- > 0) {
-		v = (inn[s*3 + 0] & 0xff) << 0;
-		v |= (inn[s*3 + 1] & 0xff) << 8;
-		v |= (inn[s*3 + 2] & 0xff) << 16;
+		v = (int32_t) (inn[s*3 + 0] & 0xff) << 0;
+		v |= (int32_t) (inn[s*3 + 1] & 0xff) << 8;
+		v |= (int32_t) (inn[s*3 + 2] & 0xff) << 16;
 		out[s] = S24_TO_SAMPLE(v);
 	}
 }

sampleconv.h

@@ -30,38 +30,38 @@
  * this is true for all supported formats.
 */
 
-#define S24_SIGN_EXTEND(x) ((x & 0x800000) ? x | ~0x7fffff : x)
+#define S24_SIGN_EXTEND(x) (((x) & 0x800000) ? (x) | ~0x7fffff : (x))
 
 #if BIT_PERFECT
 	/* these clip, but are bit perfect */
-	#define SAMPLE_TO_U8(x)     ((uint8_t) ((x * 128.0 + 127.0 <= -0.5) ? 0 : lround(x * 128.0 + 127.0)))
-	#define U8_TO_SAMPLE(x)     (((sample_t) x - 127.0) / 128.0)
-	#define SAMPLE_TO_S8(x)     ((int8_t) ((x * 128.0 >= 127.5) ? 127 : lround(x * 128.0)))
-	#define S8_TO_SAMPLE(x)     ((sample_t) x / 128.0)
-	#define SAMPLE_TO_S16(x)    ((int16_t) ((x * 32768.0 >= 32767.5) ? 32767 : lround(x * 32768.0)))
-	#define S16_TO_SAMPLE(x)    ((sample_t) x / 32768.0)
-	#define SAMPLE_TO_S24(x)    ((int32_t) ((x * 8388608.0 >= 8388607.5) ? 8388607 : lround(x * 8388608.0)))
+	#define SAMPLE_TO_U8(x)     ((uint8_t) (((x) * 128.0 + 127.0 < 0.0) ? 0 : lrint((x) * 128.0 + 127.0)))
+	#define U8_TO_SAMPLE(x)     (((sample_t) (x) - 127.0) / 128.0)
+	#define SAMPLE_TO_S8(x)     ((int8_t) (((x) * 128.0 > 127.0) ? 127 : lrint((x) * 128.0)))
+	#define S8_TO_SAMPLE(x)     ((sample_t) (x) / 128.0)
+	#define SAMPLE_TO_S16(x)    ((int16_t) (((x) * 32768.0 > 32767.0) ? 32767 : lrint((x) * 32768.0)))
+	#define S16_TO_SAMPLE(x)    ((sample_t) (x) / 32768.0)
+	#define SAMPLE_TO_S24(x)    ((int32_t) (((x) * 8388608.0 > 8388607.0) ? 8388607 : lrint((x) * 8388608.0)))
 	#define S24_TO_SAMPLE(x)    ((sample_t) S24_SIGN_EXTEND(x) / 8388608.0)
-	#define SAMPLE_TO_S32(x)    ((int32_t) ((x * 2147483648.0 >= 2147483647.5) ? 2147483647 : lround(x * 2147483648.0)))
-	#define S32_TO_SAMPLE(x)    ((sample_t) x / 2147483648.0)
+	#define SAMPLE_TO_S32(x)    ((int32_t) (((x) * 2147483648.0 > 2147483647.0) ? 2147483647 : lrint((x) * 2147483648.0)))
+	#define S32_TO_SAMPLE(x)    ((sample_t) (x) / 2147483648.0)
 #else
 	/* these do not clip, but are also not bit perfect */
-	#define SAMPLE_TO_U8(x)     ((uint8_t) lround(x * 127.0 + 127.0))
-	#define U8_TO_SAMPLE(x)     (((sample_t) x - 127.0) / 128.0)
-	#define SAMPLE_TO_S8(x)     ((int8_t) lround(x * 127.0))
-	#define S8_TO_SAMPLE(x)     ((sample_t) x / 128.0)
-	#define SAMPLE_TO_S16(x)    ((int16_t) lround(x * 32767.0))
-	#define S16_TO_SAMPLE(x)    ((sample_t) x / 32768.0)
-	#define SAMPLE_TO_S24(x)    ((int32_t) lround(x * 8388607.0))
+	#define SAMPLE_TO_U8(x)     ((uint8_t) lrint((x) * 127.0 + 127.0))
+	#define U8_TO_SAMPLE(x)     (((sample_t) (x) - 127.0) / 128.0)
+	#define SAMPLE_TO_S8(x)     ((int8_t) lrint((x) * 127.0))
+	#define S8_TO_SAMPLE(x)     ((sample_t) (x) / 128.0)
+	#define SAMPLE_TO_S16(x)    ((int16_t) lrint((x) * 32767.0))
+	#define S16_TO_SAMPLE(x)    ((sample_t) (x) / 32768.0)
+	#define SAMPLE_TO_S24(x)    ((int32_t) lrint((x) * 8388607.0))
 	#define S24_TO_SAMPLE(x)    ((sample_t) S24_SIGN_EXTEND(x) / 8388608.0)
-	#define SAMPLE_TO_S32(x)    ((int32_t) lround(x * 2147483647.0))
-	#define S32_TO_SAMPLE(x)    ((sample_t) x / 2147483648.0)
+	#define SAMPLE_TO_S32(x)    ((int32_t) lrint((x) * 2147483647.0))
+	#define S32_TO_SAMPLE(x)    ((sample_t) (x) / 2147483648.0)
 #endif
 
-#define SAMPLE_TO_FLOAT(x)  ((float) x)
-#define FLOAT_TO_SAMPLE(x)  ((sample_t) x)
-#define SAMPLE_TO_DOUBLE(x) ((double) x)
-#define DOUBLE_TO_SAMPLE(x) ((sample_t) x)
+#define SAMPLE_TO_FLOAT(x)  ((float) (x))
+#define FLOAT_TO_SAMPLE(x)  ((sample_t) (x))
+#define SAMPLE_TO_DOUBLE(x) ((double) (x))
+#define DOUBLE_TO_SAMPLE(x) ((sample_t) (x))
 
 void write_buf_u8(sample_t *, void *, ssize_t);
 void read_buf_u8(void *, sample_t *, ssize_t);