all decoders: introduce a reset() method

[libsigrokdecode.git] / decoders / i2s / pd.py

diff --git a/decoders/i2s/pd.py b/decoders/i2s/pd.py
index b0b177f1f007f0687e460db06e49361121af18a3..91801b4e98f9c0c6a62dcb8b92852907513f6092 100644 (file)
--- a/decoders/i2s/pd.py
+++ b/decoders/i2s/pd.py
@@ -18,6 +18,7 @@
 ##
 
 import sigrokdecode as srd
+import struct
 
 '''
 OUTPUT_PYTHON format:
@@ -59,6 +60,9 @@ class Decoder(srd.Decoder):
     )
 
     def __init__(self):
+        self.reset()
+
+    def reset(self):
         self.samplerate = None
         self.oldws = 1
         self.bitcount = 0
@@ -112,21 +116,16 @@ 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
+        h += b'\xff\xff\xff\xff' # Subchunk size (4G 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: