From: Andre Noll <maan@systemlinux.org>
Date: Sun, 18 Jan 2009 23:23:49 +0000 (+0100)
Subject: make_wav_header(): Add some comments.
X-Git-Tag: v0.3.4~76
X-Git-Url: http://git.tue.mpg.de/?a=commitdiff_plain;h=6bab1680d9285d0cfc1a16978a1fcfb21b746bfe;p=paraslash.git

make_wav_header(): Add some comments.
---

diff --git a/wav_filter.c b/wav_filter.c
index d30b018d..f5905f1f 100644
--- a/wav_filter.c
+++ b/wav_filter.c
@@ -38,15 +38,15 @@ static void make_wav_header(unsigned int channels, unsigned int samplerate,
 	write_u32(headbuf + 4, size - 8);
 	memcpy(headbuf + 8, "WAVE", 4);
 	memcpy(headbuf + 12, "fmt ", 4);
-	write_u32(headbuf + 16, 16);
-	write_u16(headbuf + 20, 1);	/* format */
+	write_u32(headbuf + 16, 16); /* 16 + extra format bytes (zero) */
+	write_u16(headbuf + 20, 1);	/* format (1 == PCM/uncompressed) */
 	write_u16(headbuf + 22, channels);
 	write_u32(headbuf + 24, samplerate);
 	write_u32(headbuf + 28, bytespersec);
-	write_u16(headbuf + 32, align);
-	write_u16(headbuf + 34, BITS);
-	memcpy(headbuf + 36, "data", 4);
-	write_u32(headbuf + 40, size - 44);
+	write_u16(headbuf + 32, align); /* number of bytes per sample slice */
+	write_u16(headbuf + 34, BITS); /* significant bits per sample */
+	memcpy(headbuf + 36, "data", 4); /* chunk ID */
+	write_u32(headbuf + 40, size - 44); /* chunk size */
 }
 
 static ssize_t wav_convert(char *inbuf, size_t len, struct filter_node *fn)