new audio format object

libraries/audio/src/AudioFormat.h

@@ -0,0 +1,84 @@
+//
+//  AudioFormat.h
+//  hifi
+//
+//  Created by Craig Hansen-Sturm on 8/28/14.
+//  Copyright 2014 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#ifndef hifi_AudioFormat_h
+#define hifi_AudioFormat_h
+
+#ifndef _FLOAT32_T
+#define _FLOAT32_T
+typedef float float32_t;
+#endif
+
+#ifndef _FLOAT64_T
+#define _FLOAT64_T
+typedef double float64_t;
+#endif
+
+//
+// Audio format structure (uncompressed streams only) 
+//
+
+struct AudioFormat {
+
+    struct Flags {
+        uint32_t _isFloat : 1;
+        uint32_t _isSigned : 1;
+        uint32_t _isInterleaved : 1;
+        uint32_t _isBigEndian : 1;
+        uint32_t _isPacked : 1;
+        uint32_t _reserved : 27;
+    } _flags;
+
+    uint32_t _bytesPerFrame;
+    uint32_t _channelsPerFrame;
+    uint32_t _bitsPerChannel;
+    float64_t _sampleRate;
+    
+    AudioFormat() {
+        std::memset(this, 0, sizeof(*this));
+    }
+    ~AudioFormat() { }
+    
+    AudioFormat& operator=(const AudioFormat& fmt) {
+        std::memcpy(this, &fmt, sizeof(*this));
+        return *this;
+    }
+    
+    bool operator==(const AudioFormat& fmt) {
+        return std::memcmp(this, &fmt, sizeof(*this)) == 0;
+    }
+    
+    bool operator!=(const AudioFormat& fmt) {
+        return std::memcmp(this, &fmt, sizeof(*this)) != 0;
+    }
+
+    void setCanonicalFloat32(uint32_t channels) {
+        assert(channels > 0 && channels <= 2);
+        _sampleRate = SAMPLE_RATE;
+        _bitsPerChannel = sizeof(float32_t) * 8;
+        _channelsPerFrame = channels;
+        _bytesPerFrame = _channelsPerFrame * _bitsPerChannel / 8;
+        _flags._isFloat = true;
+        _flags._isInterleaved = _channelsPerFrame > 1;
+    }
+    
+    void setCanonicalInt16(uint32_t channels) {
+        assert(channels > 0 && channels <= 2);
+        _sampleRate = SAMPLE_RATE;
+        _bitsPerChannel = sizeof(int16_t) * 8;
+        _channelsPerFrame = channels;
+        _bytesPerFrame = _channelsPerFrame * _bitsPerChannel / 8;
+        _flags._isSigned = true;
+        _flags._isInterleaved = _channelsPerFrame > 1;
+    }
+};
+
+#endif // hifi_AudioFormat_h