---
toys/posix/file.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
From 5e2f474478853a683aaa0839929ff76315037b23 Mon Sep 17 00:00:00 2001
From: Elliott Hughes <e...@google.com>
Date: Thu, 23 Aug 2018 15:47:08 -0700
Subject: [PATCH] Add .wav support to file(1).
---
toys/posix/file.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/toys/posix/file.c b/toys/posix/file.c
index 333869c..552cd03 100644
--- a/toys/posix/file.c
+++ b/toys/posix/file.c
@@ -317,6 +317,33 @@ static void do_regular_file(int fd, char *name)
if (!memcmp(s+28, "\x01vorbis", 7)) xprintf(", vorbis audio");
if (!memcmp(s+28, "YUV4MPEG", 8)) xprintf(", yuv4mpeg video");
xputc('\n');
+ } else if (len>32 && !memcmp(s, "RIF", 3) && !memcmp(s+8, "WAVEfmt ", 8)) {
+ // https://en.wikipedia.org/wiki/WAV
+ int le = (s[3] == 'F');
+ int format = le ? peek_le(s+20,2) : peek_be(s+20,2);
+ int channels = le ? peek_le(s+22,2) : peek_be(s+22,2);
+ int hz = le ? peek_le(s+24,4) : peek_be(s+24,4);
+ int bits = le ? peek_le(s+34,2) : peek_be(s+34,2);
+
+ xprintf("WAV audio, %s, ", le ? "LE" : "BE");
+ if (bits != 0) xprintf("%d-bit, ", bits);
+ if (channels==1||channels==2) xprintf("%s, ", channels==1?"mono":"stereo");
+ else xprintf("%d-channel, ", channels);
+ xprintf("%d Hz, ", hz);
+ // See https://tools.ietf.org/html/rfc2361, though there appear to be bugs
+ // in the RFC. This assumes wikipedia's example files are more correct.
+ if (format == 0x01) xprintf("PCM");
+ else if (format == 0x03) xprintf("IEEE float");
+ else if (format == 0x06) xprintf("A-law");
+ else if (format == 0x07) xprintf("ยต-law");
+ else if (format == 0x11) xprintf("ADPCM");
+ else if (format == 0x22) xprintf("Truespeech");
+ else if (format == 0x31) xprintf("GSM");
+ else if (format == 0x55) xprintf("MP3");
+ else if (format == 0x70) xprintf("CELP");
+ else if (format == 0xfffe) xprintf("extensible");
+ else xprintf("unknown format %d", format);
+ xputc('\n');
} else if (len>12 && !memcmp(s, "\x00\x01\x00\x00", 4)) {
xputs("TrueType font");
} else if (len>12 && !memcmp(s, "ttcf\x00", 5)) {
--
2.19.0.rc0.228.g281dcd1b4d0-goog
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