From: Joel Holdsworth <redacted>
Date: Wed, 8 Nov 2017 02:55:15 +0000 (-0700)
Subject: i2s: Make 32-bit wav files
X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=commitdiff_plain;h=7f214f533f4ce67f5f6e603784fd5b37809791b6

i2s: Make 32-bit wav files
---

diff --git a/decoders/i2s/pd.py b/decoders/i2s/pd.py
index b0b177f..474c606 100644
--- a/decoders/i2s/pd.py
+++ b/decoders/i2s/pd.py
@@ -18,6 +18,7 @@
 ##
 
 import sigrokdecode as srd
+import struct
 
 '''
 OUTPUT_PYTHON format:
@@ -112,21 +113,16 @@ class Decoder(srd.Decoder):
         h += b'\x01\x00'         # Audio format (0x0001 == PCM)
         h += b'\x02\x00'         # Number of channels (2)
         h += b'\x80\x3e\x00\x00' # Samplerate (16000)
-        h += b'\x00\x7d\x00\x00' # Byterate (32000)
+        h += b'\x00\xfa\x00\x00' # Byterate (64000)
         h += b'\x04\x00'         # Blockalign (4)
-        h += b'\x10\x00'         # Bits per sample (16)
+        h += b'\x20\x00'         # Bits per sample (32)
         # Data subchunk
         h += b'data'
         h += b'\xff\xff\x00\x00' # Subchunk size (65535 bytes) TODO
         return h
 
     def wav_sample(self, sample):
-        # TODO: This currently assumes U32 samples, and converts to S16.
-        s = sample >> 16
-        if s >= 0x8000:
-            s -= 0x10000
-        lo, hi = s & 0xff, (s >> 8) & 0xff
-        return bytes([lo, hi])
+        return struct.pack('I', self.data)
 
     def decode(self):
         if not self.samplerate: