Bug 1231793: Part 2 - Added conversions to AudioSampleFormat.h. r=jya

dom/media/AudioSampleFormat.h

@@ -96,6 +96,19 @@ FloatToAudioSample<int16_t>(float aValue)
   return int16_t(clamped);
 }
 
+template <typename T> T UInt8bitToAudioSample(uint8_t aValue);
+
+template <> inline float
+UInt8bitToAudioSample<float>(uint8_t aValue)
+{
+  return aValue * (static_cast<float>(2) / UINT8_MAX) - static_cast<float>(1);
+}
+template <> inline int16_t
+UInt8bitToAudioSample<int16_t>(uint8_t aValue)
+{
+  return (int16_t(aValue) << 8) + aValue + INT16_MIN;
+}
+
 template <typename T> T IntegerToAudioSample(int16_t aValue);
 
 template <> inline float
@@ -109,6 +122,19 @@ IntegerToAudioSample<int16_t>(int16_t aValue)
   return aValue;
 }
 
+template <typename T> T Int24bitToAudioSample(int32_t aValue);
+
+template <> inline float
+Int24bitToAudioSample<float>(int32_t aValue)
+{
+  return aValue / static_cast<float>(1 << 23);
+}
+template <> inline int16_t
+Int24bitToAudioSample<int16_t>(int32_t aValue)
+{
+  return aValue / 256;
+}
+
 template<typename SrcT, typename DstT>
 inline void
 ConvertAudioSample(SrcT aIn, DstT& aOut);