wavpack: add bits_per_sample

mutagen/wavpack.py

@@ -78,6 +78,7 @@ class WavPackInfo(StreamInfo):
         channels (int): number of audio channels (1 or 2)
         length (float): file length in seconds, as a float
         sample_rate (int): audio sampling rate in Hz
+        bits_per_sample (int): audio sample size
         version (int): WavPack stream version
     """
 
@@ -90,10 +91,12 @@ def __init__(self, fileobj):
         self.version = header.version
         self.channels = bool(header.flags & 4) or 2
         self.sample_rate = RATES[(header.flags >> 23) & 0xF]
+        self.bits_per_sample = ((header.flags & 3) + 1) * 8
 
         # most common multiplier (DSD64)
         if (header.flags >> 31) & 1:
             self.sample_rate *= 4
+            self.bits_per_sample = 1
 
         if header.total_samples == -1 or header.block_index != 0:
             # TODO: we could make this faster by using the tag size

tests/test_wavpack.py

@@ -20,6 +20,9 @@ def test_channels(self):
     def test_sample_rate(self):
         self.failUnlessEqual(self.audio.info.sample_rate, 44100)
 
+    def test_bits_per_sample(self):
+        self.failUnlessEqual(self.audio.info.bits_per_sample, 16)
+
     def test_length(self):
         self.failUnlessAlmostEqual(self.audio.info.length, 3.68, 2)
 
@@ -48,6 +51,9 @@ def test_channels(self):
     def test_sample_rate(self):
         self.failUnlessEqual(self.audio.info.sample_rate, 44100)
 
+    def test_bits_per_sample(self):
+        self.failUnlessEqual(self.audio.info.bits_per_sample, 16)
+
     def test_length(self):
         self.failUnlessAlmostEqual(self.audio.info.length, 3.705, 3)
 
@@ -72,6 +78,9 @@ def test_channels(self):
     def test_sample_rate(self):
         self.failUnlessEqual(self.audio.info.sample_rate, 352800)
 
+    def test_bits_per_sample(self):
+        self.failUnlessEqual(self.audio.info.bits_per_sample, 1)
+
     def test_length(self):
         self.failUnlessAlmostEqual(self.audio.info.length, 0.01, 3)