Implements RGB to YV12 conversion in YASM.

media/base/simd/yuv_row.asm

Index: media/base/simd/yuv_row.asm
===================================================================
--- media/base/simd/yuv_row.asm	(revision 0)
+++ media/base/simd/yuv_row.asm	(revision 0)
@@ -0,0 +1,128 @@
+; Copyright (c) 2011 The Chromium Authors. All rights reserved.

[Alpha Left Google, 2011/08/22 14:16:59]

Rename this to media/base/yuv_row_sse2.asm

+; Use of this source code is governed by a BSD-style license that can be
+; found in the LICENSE file.
+
+%include "yuv_row.inc"
+
+;
+; The numer of fractional bits used for fixed-point calculation.
+;
+%define SHIFT_BITS  12
+%define FIX(n)      (n >> (12 - SHIFT_BITS))
+
+;
+; Tables used for RGB-to-YV12 conversion and YV12-to-RGB conversion. These
+; tables represent the conversion matrices used for the conversions as listed in
+; following C++ snippet. Unfortunately, we need to use precalculated constants
+; here since the yasm preprocessor cannot handle complicated floating-point
+; calculation.
+;
+; #define FIX(n) ((n) * (1 << SHIFT_BITS) + 0.5)
+;
+; int16 SIMD_ConvertRGBAToYUV_kTable[8 * 3] = {
+;     FIX(0.098), FIX(0.504), FIX(0.257), 0,
+;     FIX(0.098), FIX(0.504), FIX(0.257), 0,
+;     FIX(0.5), 0, FIX(0.5), 0,
+;     FIX(0.5), 0, FIX(0.5), 0,
+;     FIX(0.439), -FIX(0.291), -FIX(0.148), 0,
+;     -FIX(0.071), -FIX(0.368), FIX(0.439), 0,
+; };
+;
+; int16 SIMD_ConvertYUVtoRGBA_kTable[8 * 2] = {
+;     -16, -128, -128, FIX(0.5),
+;     FIX(1.164), 0, FIX(1.596), 1,
+;     FIX(1.164), -FIX(0.391), -FIX(0.813), 1,
+;     FIX(1.164), FIX(2.018), 0, 1,
+; };
+;
+  SECTION   SEG_CONST
+
+SIMD_ConvertARGBToYUVRow_kTable:

[Alpha Left Google, 2011/08/22 14:16:59]

SSE2_XXX, there may be a different NEON version.

+  dw        FIX(401), FIX(2064), FIX(1053), 0
+  dw        FIX(401), FIX(2064), FIX(1053), 0
+  dw        FIX(2048), 0, FIX(2048), 0
+  dw        FIX(2048), 0, FIX(2048), 0
+  dw        FIX(1798), FIX(-1191), FIX(-605), 0
+  dw        FIX(-290), FIX(-1506), FIX(1798), 0
+
+SIMD_ConvertYUVtoARGB_kTable:

[Alpha Left Google, 2011/08/22 14:16:59]

SSE2_XXX, there may be a different NEON version.

+  dw        -16, -128, -128, FIX(2048)
+  dw        FIX(4768), FIX(0), FIX(6537), 1
+  dw        FIX(4768), FIX(-1601), FIX(-3329), 1
+  dw        FIX(4768), FIX(8266), FIX(0), 1
+
+  SECTION   SEG_TEXT
+  CPU       PENTIUM4
+;
+; void media::simd::ConvertARGBToYUVRow(const uint8* rgba,
+;                                       uint8* y,
+;                                       uint8* u,
+;                                       uint8* v,
+;                                       int width);
+;
+%ifdef MACHO
+%define SYMBOL_NAME     __ZN5media4simd19ConvertARGBtoYUVRowEPKhPhS3_S3_i
+%elifdef ELF
+%define SYMBOL_NAME     _ZN5media4simd19ConvertARGBtoYUVRowEPKhPhS3_S3_i
+%elifdef MSVC
+%define SYMBOL_NAME     ?ConvertARGBtoYUVRow@simd@media@@YAXPBEPAE11H@Z
+%endif
+
+%define PIXELSIZE       4
+%include "yuv_row_rgb.inc"
+
+;
+; void media::simd::ConvertRGBToYUVRow(const uint8* rgba,
+;                                      uint8* y,
+;                                      uint8* u,
+;                                      uint8* v,
+;                                      int width);
+;
+%ifdef MACHO
+%define SYMBOL_NAME     __ZN5media4simd18ConvertRGBtoYUVRowEPKhPhS3_S3_i
+%elifdef ELF
+%define SYMBOL_NAME     _ZN5media4simd18ConvertRGBtoYUVRowEPKhPhS3_S3_i
+%elifdef MSVC
+%define SYMBOL_NAME     ?ConvertRGBtoYUVRow@simd@media@@YAXPBEPAE11H@Z
+%endif
+
+%define PIXELSIZE       3
+%include "yuv_row_rgb.inc"
+
+;
+; void media::simd::ConvertYUVtoRGBARow(const uint8* y,
+;                                       const uint8* u,
+;                                       const uint8* v,
+;                                       const uint8* rgba,
+;                                       int width);
+;
+%ifdef MACHO
+%define SYMBOL_NAME     __ZN5media4simd19ConvertYUVtoARGBRowEPKhS2_S2_Phi
+%elifdef ELF
+%define SYMBOL_NAME     _ZN5media4simd19ConvertYUVtoARGBRowEPKhS2_S2_Phi
+%elifdef MSVC
+%define SYMBOL_NAME     ?ConvertYUVtoARGBRow@simd@media@@YAXPBE00PAEH@Z
+%endif
+
+%define PIXELSIZE       4
+%define ALPHA           255
+%include "yuv_row_yuv.inc"
+
+;
+; void media::simd::ConvertYUVtoRGBRow(const uint8* y,
+;                                      const uint8* u,
+;                                      const uint8* v,
+;                                      const uint8* rgb,
+;                                      int width);
+;
+%ifdef MACHO
+%define SYMBOL_NAME     __ZN5media4simd18ConvertYUVtoRGBRowEPKhS2_S2_Phi
+%elifdef ELF
+%define SYMBOL_NAME     _ZN5media4simd18ConvertYUVtoRGBRowEPKhS2_S2_Phi
+%elifdef MSVC
+%define SYMBOL_NAME     ?ConvertYUVtoRGBRow@simd@media@@YAXPBE00PAEH@Z
+%endif
+
+%define PIXELSIZE       3
+%define ALPHA           0
+%include "yuv_row_yuv.inc"