1 files changed, 187 insertions, 0 deletions
diff --git a/chromium/third_party/WebKit/Source/platform/audio/android/FFTFrameOpenMAXDLAndroid.cpp b/chromium/third_party/WebKit/Source/platform/audio/android/FFTFrameOpenMAXDLAndroid.cpp
new file mode 100644
index 00000000000..277d172de04
--- /dev/null
+++ b/chromium/third_party/WebKit/Source/platform/audio/android/FFTFrameOpenMAXDLAndroid.cpp
@@ -0,0 +1,187 @@
+/* Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#if ENABLE(WEB_AUDIO)
+
+#if OS(ANDROID) && USE(WEBAUDIO_OPENMAX_DL_FFT)
+
+#include "platform/audio/FFTFrame.h"
+
+#include "platform/audio/AudioArray.h"
+#include "wtf/MathExtras.h"
+#include <dl/sp/api/armSP.h>
+#include <dl/sp/api/omxSP.h>
+
+namespace WebCore {
+
+#if ASSERT_ENABLED
+const unsigned kMaxFFTPow2Size = 15;
+#endif
+
+// Normal constructor: allocates for a given fftSize.
+FFTFrame::FFTFrame(unsigned fftSize)
+    : m_FFTSize(fftSize)
+    , m_log2FFTSize(static_cast<unsigned>(log2(fftSize)))
+    , m_forwardContext(0)
+    , m_inverseContext(0)
+    , m_complexData(fftSize)
+    , m_realData(fftSize / 2)
+    , m_imagData(fftSize / 2)
+{
+    // We only allow power of two.
+    ASSERT(1UL << m_log2FFTSize == m_FFTSize);
+
+    m_forwardContext = contextForSize(m_log2FFTSize);
+    m_inverseContext = contextForSize(m_log2FFTSize);
+}
+
+// Creates a blank/empty frame (interpolate() must later be called).
+FFTFrame::FFTFrame()
+    : m_FFTSize(0)
+    , m_log2FFTSize(0)
+    , m_forwardContext(0)
+    , m_inverseContext(0)
+{
+}
+
+// Copy constructor.
+FFTFrame::FFTFrame(const FFTFrame& frame)
+    : m_FFTSize(frame.m_FFTSize)
+    , m_log2FFTSize(frame.m_log2FFTSize)
+    , m_forwardContext(0)
+    , m_inverseContext(0)
+    , m_complexData(frame.m_FFTSize)
+    , m_realData(frame.m_FFTSize / 2)
+    , m_imagData(frame.m_FFTSize / 2)
+{
+    m_forwardContext = contextForSize(m_log2FFTSize);
+    m_inverseContext = contextForSize(m_log2FFTSize);
+
+    // Copy/setup frame data.
+    unsigned nbytes = sizeof(float) * (m_FFTSize / 2);
+    memcpy(realData(), frame.realData(), nbytes);
+    memcpy(imagData(), frame.imagData(), nbytes);
+}
+
+void FFTFrame::initialize()
+{
+}
+
+void FFTFrame::cleanup()
+{
+}
+
+FFTFrame::~FFTFrame()
+{
+    if (m_forwardContext)
+        free(m_forwardContext);
+    if (m_inverseContext)
+        free(m_inverseContext);
+}
+
+void FFTFrame::doFFT(const float* data)
+{
+    ASSERT(m_forwardContext);
+
+    if (m_forwardContext) {
+        AudioFloatArray complexFFT(m_FFTSize + 2);
+
+        omxSP_FFTFwd_RToCCS_F32(data, complexFFT.data(), m_forwardContext);
+
+        unsigned len = m_FFTSize / 2;
+
+        // Split FFT data into real and imaginary arrays.
+        const float* c = complexFFT.data();
+        float* real = m_realData.data();
+        float* imag = m_imagData.data();
+        for (unsigned k = 1; k < len; ++k) {
+            int index = 2 * k;
+            real[k] = c[index];
+            imag[k] = c[index + 1];
+        }
+        real[0] = c[0];
+        imag[0] = c[m_FFTSize];
+    }
+}
+
+void FFTFrame::doInverseFFT(float* data)
+{
+    ASSERT(m_inverseContext);
+
+    if (m_inverseContext) {
+        AudioFloatArray fftDataArray(m_FFTSize + 2);
+
+        unsigned len = m_FFTSize / 2;
+
+        // Pack the real and imaginary data into the complex array format
+        float* fftData = fftDataArray.data();
+        const float* real = m_realData.data();
+        const float* imag = m_imagData.data();
+        for (unsigned k = 1; k < len; ++k) {
+            int index = 2 * k;
+            fftData[index] = real[k];
+            fftData[index + 1] = imag[k];
+        }
+        fftData[0] = real[0];
+        fftData[1] = 0;
+        fftData[m_FFTSize] = imag[0];
+        fftData[m_FFTSize + 1] = 0;
+
+        omxSP_FFTInv_CCSToR_F32(fftData, data, m_inverseContext);
+    }
+}
+
+float* FFTFrame::realData() const
+{
+    return const_cast<float*>(m_realData.data());
+}
+
+float* FFTFrame::imagData() const
+{
+    return const_cast<float*>(m_imagData.data());
+}
+
+OMXFFTSpec_R_F32* FFTFrame::contextForSize(unsigned log2FFTSize)
+{
+    ASSERT(log2FFTSize);
+    ASSERT(log2FFTSize <= kMaxFFTPow2Size);
+    int bufSize;
+    OMXResult status = omxSP_FFTGetBufSize_R_F32(log2FFTSize, &bufSize);
+
+    if (status == OMX_Sts_NoErr) {
+        OMXFFTSpec_R_F32* context = static_cast<OMXFFTSpec_R_F32*>(malloc(bufSize));
+        omxSP_FFTInit_R_F32(context, log2FFTSize);
+        return context;
+    }
+
+    return 0;
+}
+
+} // namespace WebCore
+
+#endif // #if OS(ANDROID) && !USE(WEBAUDIO_OPENMAX_DL_FFT)
+
+#endif // ENABLE(WEB_AUDIO)