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Side by Side Diff: Source/platform/audio/SincResampler.cpp

Issue 400543004: Rename WebCore namespace to blink in Platform (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: Created 6 years, 5 months ago
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1 /* 1 /*
2 * Copyright (C) 2011 Google Inc. All rights reserved. 2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without 4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions 5 * modification, are permitted provided that the following conditions
6 * are met: 6 * are met:
7 * 7 *
8 * 1. Redistributions of source code must retain the above copyright 8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer. 9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright 10 * 2. Redistributions in binary form must reproduce the above copyright
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62 // 62 //
63 // 1) Consume input frames into r0 (r1 is zero-initialized). 63 // 1) Consume input frames into r0 (r1 is zero-initialized).
64 // 2) Position kernel centered at start of r0 (r2) and generate output frames un til kernel is centered at start of r4. 64 // 2) Position kernel centered at start of r0 (r2) and generate output frames un til kernel is centered at start of r4.
65 // or we've finished generating all the output frames. 65 // or we've finished generating all the output frames.
66 // 3) Copy r3 to r1 and r4 to r2. 66 // 3) Copy r3 to r1 and r4 to r2.
67 // 4) Consume input frames into r5 (zero-pad if we run out of input). 67 // 4) Consume input frames into r5 (zero-pad if we run out of input).
68 // 5) Goto (2) until all of input is consumed. 68 // 5) Goto (2) until all of input is consumed.
69 // 69 //
70 // note: we're glossing over how the sub-sample handling works with m_virtualSou rceIndex, etc. 70 // note: we're glossing over how the sub-sample handling works with m_virtualSou rceIndex, etc.
71 71
72 namespace WebCore { 72 namespace blink {
73 73
74 SincResampler::SincResampler(double scaleFactor, unsigned kernelSize, unsigned n umberOfKernelOffsets) 74 SincResampler::SincResampler(double scaleFactor, unsigned kernelSize, unsigned n umberOfKernelOffsets)
75 : m_scaleFactor(scaleFactor) 75 : m_scaleFactor(scaleFactor)
76 , m_kernelSize(kernelSize) 76 , m_kernelSize(kernelSize)
77 , m_numberOfKernelOffsets(numberOfKernelOffsets) 77 , m_numberOfKernelOffsets(numberOfKernelOffsets)
78 , m_kernelStorage(m_kernelSize * (m_numberOfKernelOffsets + 1)) 78 , m_kernelStorage(m_kernelSize * (m_numberOfKernelOffsets + 1))
79 , m_virtualSourceIndex(0) 79 , m_virtualSourceIndex(0)
80 , m_blockSize(512) 80 , m_blockSize(512)
81 , m_inputBuffer(m_blockSize + m_kernelSize) // See input buffer layout above . 81 , m_inputBuffer(m_blockSize + m_kernelSize) // See input buffer layout above .
82 , m_source(0) 82 , m_source(0)
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463 // This wraps the last input frames back to the start of the buffer. 463 // This wraps the last input frames back to the start of the buffer.
464 memcpy(r1, r3, sizeof(float) * (m_kernelSize / 2)); 464 memcpy(r1, r3, sizeof(float) * (m_kernelSize / 2));
465 memcpy(r2, r4, sizeof(float) * (m_kernelSize / 2)); 465 memcpy(r2, r4, sizeof(float) * (m_kernelSize / 2));
466 466
467 // Step (4) 467 // Step (4)
468 // Refresh the buffer with more input. 468 // Refresh the buffer with more input.
469 consumeSource(r5, m_blockSize); 469 consumeSource(r5, m_blockSize);
470 } 470 }
471 } 471 }
472 472
473 } // namespace WebCore 473 } // namespace blink
474 474
475 #endif // ENABLE(WEB_AUDIO) 475 #endif // ENABLE(WEB_AUDIO)
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