X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=decoders%2Fi2s%2Fpd.py;h=bfb2c9e9f71b3952551d46499a957b7066c663ff;hb=2842721f189c5338d268a6e70002936289ae6069;hp=e14e5a4b4d369a079ce9e62c9fda4daf12caea6b;hpb=07e40f346ac1ed5ca98f636f2dd0ba5a7fe0011e;p=libsigrokdecode.git

diff --git a/decoders/i2s/pd.py b/decoders/i2s/pd.py
index e14e5a4..bfb2c9e 100644
--- a/decoders/i2s/pd.py
+++ b/decoders/i2s/pd.py
@@ -14,11 +14,11 @@
 ## GNU General Public License for more details.
 ##
 ## You should have received a copy of the GNU General Public License
-## along with this program; if not, write to the Free Software
-## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+## along with this program; if not, see <http://www.gnu.org/licenses/>.
 ##
 
 import sigrokdecode as srd
+import struct
 
 '''
 OUTPUT_PYTHON format:
@@ -33,9 +33,6 @@ Packet:
 <value>: integer
 '''
 
-class SamplerateError(Exception):
-    pass
-
 class Decoder(srd.Decoder):
     api_version = 3
     id = 'i2s'
@@ -60,6 +57,9 @@ class Decoder(srd.Decoder):
     )
 
     def __init__(self):
+        self.reset()
+
+    def reset(self):
         self.samplerate = None
         self.oldws = 1
         self.bitcount = 0
@@ -89,12 +89,12 @@ class Decoder(srd.Decoder):
         self.put(self.ss_block, self.samplenum, self.out_ann, data)
 
     def report(self):
-
         # Calculate the sample rate.
         samplerate = '?'
         if self.ss_block is not None and \
             self.first_sample is not None and \
-            self.ss_block > self.first_sample:
+            self.ss_block > self.first_sample and \
+            self.samplerate:
             samplerate = '%d' % (self.samplesreceived *
                 self.samplerate / (self.ss_block -
                 self.first_sample))
@@ -113,25 +113,18 @@ 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:
-            raise SamplerateError('Cannot decode without samplerate.')
         while True:
             # Wait for a rising edge on the SCK pin.
             sck, ws, sd = self.wait({0: 'r'})