All PDs: Minor whitespace and consistency fixes.

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

diff --git a/decoders/guess_bitrate/pd.py b/decoders/guess_bitrate/pd.py
index 585bd76c96449755b23ce794c347e521c756d2f4..250d519977430f08721deaa5d4548f29e9aff4f8 100644 (file)
--- a/decoders/guess_bitrate/pd.py
+++ b/decoders/guess_bitrate/pd.py
@@ -18,12 +18,13 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 ##
 
-# Bitrate / baudrate guessing protocol decoder
-
 import sigrokdecode as srd
 
+class SamplerateError(Exception):
+    pass
+
 class Decoder(srd.Decoder):
-    api_version = 1
+    api_version = 2
     id = 'guess_bitrate'
     name = 'Guess bitrate'
     longname = 'Guess bitrate/baudrate'
@@ -31,14 +32,12 @@ class Decoder(srd.Decoder):
     license = 'gplv2+'
     inputs = ['logic']
     outputs = ['guess_bitrate']
-    probes = [
+    channels = (
         {'id': 'data', 'name': 'Data', 'desc': 'Data line'},
-    ]
-    optional_probes = []
-    options = {}
-    annotations = [
-        ['bitrate', 'Bitrate / baudrate'],
-    ]
+    )
+    annotations = (
+        ('bitrate', 'Bitrate / baudrate'),
+    )
 
     def putx(self, data):
         self.put(self.ss_edge, self.samplenum, self.out_ann, data)
@@ -49,15 +48,16 @@ class Decoder(srd.Decoder):
         self.first_transition = True
         self.bitwidth = None
 
-    def start(self, metadata):
-        self.samplerate = metadata['samplerate']
-        # self.out_proto = self.add(srd.OUTPUT_PROTO, 'guess_bitrate')
-        self.out_ann = self.add(srd.OUTPUT_ANN, 'guess_bitrate')
+    def start(self):
+        self.out_ann = self.register(srd.OUTPUT_ANN)
 
-    def report(self):
-        pass
+    def metadata(self, key, value):
+        if key == srd.SRD_CONF_SAMPLERATE:
+            self.samplerate = value
 
     def decode(self, ss, es, data):
+        if not self.samplerate:
+            raise SamplerateError('Cannot decode without samplerate.')
         for (self.samplenum, pins) in data:
 
             data = pins[0]
@@ -67,22 +67,21 @@ class Decoder(srd.Decoder):
                 continue
 
             # Initialize first self.olddata with the first sample value.
-            if self.olddata == None:
+            if self.olddata is None:
                 self.olddata = data
                 continue
 
             # Get the smallest distance between two transitions
             # and use that to calculate the bitrate/baudrate.
-            if self.first_transition == True:
+            if self.first_transition:
                 self.ss_edge = self.samplenum
                 self.first_transition = False
             else:
                 b = self.samplenum - self.ss_edge
-                if self.bitwidth == None or b < self.bitwidth:
+                if self.bitwidth is None or b < self.bitwidth:
                     self.bitwidth = b
                     bitrate = int(float(self.samplerate) / float(b))
                     self.putx([0, ['%d' % bitrate]])
                 self.ss_edge = self.samplenum
 
             self.olddata = data
-