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

Issue 2867693004: Snapshot of all changes to get jumbo in blink and content.
Patch Set: Rebased again Created 3 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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457 CONVOLVE_ONE_SAMPLE(); // 63 457 CONVOLVE_ONE_SAMPLE(); // 63
458 CONVOLVE_ONE_SAMPLE(); // 64 458 CONVOLVE_ONE_SAMPLE(); // 64
459 } else { 459 } else {
460 while (n--) { 460 while (n--) {
461 // Non-optimized using actual while loop. 461 // Non-optimized using actual while loop.
462 CONVOLVE_ONE_SAMPLE(); 462 CONVOLVE_ONE_SAMPLE();
463 } 463 }
464 } 464 }
465 #endif 465 #endif
466 } 466 }
467 #undef CONVOLVE_ONE_SAMPLE
467 468
468 // Linearly interpolate the two "convolutions". 469 // Linearly interpolate the two "convolutions".
469 double result = (1.0 - kernel_interpolation_factor) * sum1 + 470 double result = (1.0 - kernel_interpolation_factor) * sum1 +
470 kernel_interpolation_factor * sum2; 471 kernel_interpolation_factor * sum2;
471 472
472 *destination++ = result; 473 *destination++ = result;
473 474
474 // Advance the virtual index. 475 // Advance the virtual index.
475 virtual_source_index_ += scale_factor_; 476 virtual_source_index_ += scale_factor_;
476 477
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487 memcpy(r1, r3, sizeof(float) * (kernel_size_ / 2)); 488 memcpy(r1, r3, sizeof(float) * (kernel_size_ / 2));
488 memcpy(r2, r4, sizeof(float) * (kernel_size_ / 2)); 489 memcpy(r2, r4, sizeof(float) * (kernel_size_ / 2));
489 490
490 // Step (4) 491 // Step (4)
491 // Refresh the buffer with more input. 492 // Refresh the buffer with more input.
492 ConsumeSource(r5, block_size_); 493 ConsumeSource(r5, block_size_);
493 } 494 }
494 } 495 }
495 496
496 } // namespace blink 497 } // namespace blink
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