diff options
Diffstat (limited to 'vp9/common/vp9_idctllm.c')
-rw-r--r-- | vp9/common/vp9_idctllm.c | 1784 |
1 files changed, 1784 insertions, 0 deletions
diff --git a/vp9/common/vp9_idctllm.c b/vp9/common/vp9_idctllm.c new file mode 100644 index 000000000..9d559ed22 --- /dev/null +++ b/vp9/common/vp9_idctllm.c @@ -0,0 +1,1784 @@ +/* + * Copyright (c) 2010 The WebM project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + + +/**************************************************************************** + * Notes: + * + * This implementation makes use of 16 bit fixed point verio of two multiply + * constants: + * 1. sqrt(2) * cos (pi/8) + * 2. sqrt(2) * sin (pi/8) + * Becuase the first constant is bigger than 1, to maintain the same 16 bit + * fixed point precision as the second one, we use a trick of + * x * a = x + x*(a-1) + * so + * x * sqrt(2) * cos (pi/8) = x + x * (sqrt(2) *cos(pi/8)-1). + **************************************************************************/ +#include <assert.h> +#include <math.h> +#include "vpx_ports/config.h" +#include "vp9/common/vp9_systemdependent.h" + +#include "vp9/common/vp9_blockd.h" + +static const int cospi8sqrt2minus1 = 20091; +static const int sinpi8sqrt2 = 35468; +static const int rounding = 0; + +// TODO: these transforms can be further converted into integer forms +// for complexity optimization +static const float idct_4[16] = { + 0.500000000000000, 0.653281482438188, 0.500000000000000, 0.270598050073099, + 0.500000000000000, 0.270598050073099, -0.500000000000000, -0.653281482438188, + 0.500000000000000, -0.270598050073099, -0.500000000000000, 0.653281482438188, + 0.500000000000000, -0.653281482438188, 0.500000000000000, -0.270598050073099 +}; + +static const float iadst_4[16] = { + 0.228013428883779, 0.577350269189626, 0.656538502008139, 0.428525073124360, + 0.428525073124360, 0.577350269189626, -0.228013428883779, -0.656538502008139, + 0.577350269189626, 0, -0.577350269189626, 0.577350269189626, + 0.656538502008139, -0.577350269189626, 0.428525073124359, -0.228013428883779 +}; + +static const float idct_8[64] = { + 0.353553390593274, 0.490392640201615, 0.461939766255643, 0.415734806151273, + 0.353553390593274, 0.277785116509801, 0.191341716182545, 0.097545161008064, + 0.353553390593274, 0.415734806151273, 0.191341716182545, -0.097545161008064, + -0.353553390593274, -0.490392640201615, -0.461939766255643, -0.277785116509801, + 0.353553390593274, 0.277785116509801, -0.191341716182545, -0.490392640201615, + -0.353553390593274, 0.097545161008064, 0.461939766255643, 0.415734806151273, + 0.353553390593274, 0.097545161008064, -0.461939766255643, -0.277785116509801, + 0.353553390593274, 0.415734806151273, -0.191341716182545, -0.490392640201615, + 0.353553390593274, -0.097545161008064, -0.461939766255643, 0.277785116509801, + 0.353553390593274, -0.415734806151273, -0.191341716182545, 0.490392640201615, + 0.353553390593274, -0.277785116509801, -0.191341716182545, 0.490392640201615, + -0.353553390593274, -0.097545161008064, 0.461939766255643, -0.415734806151273, + 0.353553390593274, -0.415734806151273, 0.191341716182545, 0.097545161008064, + -0.353553390593274, 0.490392640201615, -0.461939766255643, 0.277785116509801, + 0.353553390593274, -0.490392640201615, 0.461939766255643, -0.415734806151273, + 0.353553390593274, -0.277785116509801, 0.191341716182545, -0.097545161008064 +}; + +static const float iadst_8[64] = { + 0.089131608307533, 0.255357107325376, 0.387095214016349, 0.466553967085785, + 0.483002021635509, 0.434217976756762, 0.326790388032145, 0.175227946595735, + 0.175227946595735, 0.434217976756762, 0.466553967085785, 0.255357107325376, + -0.089131608307533, -0.387095214016348, -0.483002021635509, -0.326790388032145, + 0.255357107325376, 0.483002021635509, 0.175227946595735, -0.326790388032145, + -0.466553967085785, -0.089131608307533, 0.387095214016349, 0.434217976756762, + 0.326790388032145, 0.387095214016349, -0.255357107325376, -0.434217976756762, + 0.175227946595735, 0.466553967085786, -0.089131608307534, -0.483002021635509, + 0.387095214016349, 0.175227946595735, -0.483002021635509, 0.089131608307533, + 0.434217976756762, -0.326790388032145, -0.255357107325377, 0.466553967085785, + 0.434217976756762, -0.089131608307533, -0.326790388032145, 0.483002021635509, + -0.255357107325376, -0.175227946595735, 0.466553967085785, -0.387095214016348, + 0.466553967085785, -0.326790388032145, 0.089131608307533, 0.175227946595735, + -0.387095214016348, 0.483002021635509, -0.434217976756762, 0.255357107325376, + 0.483002021635509, -0.466553967085785, 0.434217976756762, -0.387095214016348, + 0.326790388032145, -0.255357107325375, 0.175227946595736, -0.089131608307532 +}; + +static const int16_t idct_i4[16] = { + 8192, 10703, 8192, 4433, + 8192, 4433, -8192, -10703, + 8192, -4433, -8192, 10703, + 8192, -10703, 8192, -4433 +}; + +static const int16_t iadst_i4[16] = { + 3736, 9459, 10757, 7021, + 7021, 9459, -3736, -10757, + 9459, 0, -9459, 9459, + 10757, -9459, 7021, -3736 +}; + +static const int16_t idct_i8[64] = { + 5793, 8035, 7568, 6811, + 5793, 4551, 3135, 1598, + 5793, 6811, 3135, -1598, + -5793, -8035, -7568, -4551, + 5793, 4551, -3135, -8035, + -5793, 1598, 7568, 6811, + 5793, 1598, -7568, -4551, + 5793, 6811, -3135, -8035, + 5793, -1598, -7568, 4551, + 5793, -6811, -3135, 8035, + 5793, -4551, -3135, 8035, + -5793, -1598, 7568, -6811, + 5793, -6811, 3135, 1598, + -5793, 8035, -7568, 4551, + 5793, -8035, 7568, -6811, + 5793, -4551, 3135, -1598 +}; + +static const int16_t iadst_i8[64] = { + 1460, 4184, 6342, 7644, + 7914, 7114, 5354, 2871, + 2871, 7114, 7644, 4184, + -1460, -6342, -7914, -5354, + 4184, 7914, 2871, -5354, + -7644, -1460, 6342, 7114, + 5354, 6342, -4184, -7114, + 2871, 7644, -1460, -7914, + 6342, 2871, -7914, 1460, + 7114, -5354, -4184, 7644, + 7114, -1460, -5354, 7914, + -4184, -2871, 7644, -6342, + 7644, -5354, 1460, 2871, + -6342, 7914, -7114, 4184, + 7914, -7644, 7114, -6342, + 5354, -4184, 2871, -1460 +}; + +static float idct_16[256] = { + 0.250000, 0.351851, 0.346760, 0.338330, 0.326641, 0.311806, 0.293969, 0.273300, + 0.250000, 0.224292, 0.196424, 0.166664, 0.135299, 0.102631, 0.068975, 0.034654, + 0.250000, 0.338330, 0.293969, 0.224292, 0.135299, 0.034654, -0.068975, -0.166664, + -0.250000, -0.311806, -0.346760, -0.351851, -0.326641, -0.273300, -0.196424, -0.102631, + 0.250000, 0.311806, 0.196424, 0.034654, -0.135299, -0.273300, -0.346760, -0.338330, + -0.250000, -0.102631, 0.068975, 0.224292, 0.326641, 0.351851, 0.293969, 0.166664, + 0.250000, 0.273300, 0.068975, -0.166664, -0.326641, -0.338330, -0.196424, 0.034654, + 0.250000, 0.351851, 0.293969, 0.102631, -0.135299, -0.311806, -0.346760, -0.224292, + 0.250000, 0.224292, -0.068975, -0.311806, -0.326641, -0.102631, 0.196424, 0.351851, + 0.250000, -0.034654, -0.293969, -0.338330, -0.135299, 0.166664, 0.346760, 0.273300, + 0.250000, 0.166664, -0.196424, -0.351851, -0.135299, 0.224292, 0.346760, 0.102631, + -0.250000, -0.338330, -0.068975, 0.273300, 0.326641, 0.034654, -0.293969, -0.311806, + 0.250000, 0.102631, -0.293969, -0.273300, 0.135299, 0.351851, 0.068975, -0.311806, + -0.250000, 0.166664, 0.346760, 0.034654, -0.326641, -0.224292, 0.196424, 0.338330, + 0.250000, 0.034654, -0.346760, -0.102631, 0.326641, 0.166664, -0.293969, -0.224292, + 0.250000, 0.273300, -0.196424, -0.311806, 0.135299, 0.338330, -0.068975, -0.351851, + 0.250000, -0.034654, -0.346760, 0.102631, 0.326641, -0.166664, -0.293969, 0.224292, + 0.250000, -0.273300, -0.196424, 0.311806, 0.135299, -0.338330, -0.068975, 0.351851, + 0.250000, -0.102631, -0.293969, 0.273300, 0.135299, -0.351851, 0.068975, 0.311806, + -0.250000, -0.166664, 0.346760, -0.034654, -0.326641, 0.224292, 0.196424, -0.338330, + 0.250000, -0.166664, -0.196424, 0.351851, -0.135299, -0.224292, 0.346760, -0.102631, + -0.250000, 0.338330, -0.068975, -0.273300, 0.326641, -0.034654, -0.293969, 0.311806, + 0.250000, -0.224292, -0.068975, 0.311806, -0.326641, 0.102631, 0.196424, -0.351851, + 0.250000, 0.034654, -0.293969, 0.338330, -0.135299, -0.166664, 0.346760, -0.273300, + 0.250000, -0.273300, 0.068975, 0.166664, -0.326641, 0.338330, -0.196424, -0.034654, + 0.250000, -0.351851, 0.293969, -0.102631, -0.135299, 0.311806, -0.346760, 0.224292, + 0.250000, -0.311806, 0.196424, -0.034654, -0.135299, 0.273300, -0.346760, 0.338330, + -0.250000, 0.102631, 0.068975, -0.224292, 0.326641, -0.351851, 0.293969, -0.166664, + 0.250000, -0.338330, 0.293969, -0.224292, 0.135299, -0.034654, -0.068975, 0.166664, + -0.250000, 0.311806, -0.346760, 0.351851, -0.326641, 0.273300, -0.196424, 0.102631, + 0.250000, -0.351851, 0.346760, -0.338330, 0.326641, -0.311806, 0.293969, -0.273300, + 0.250000, -0.224292, 0.196424, -0.166664, 0.135299, -0.102631, 0.068975, -0.034654 +}; + +static float iadst_16[256] = { + 0.033094, 0.098087, 0.159534, 0.215215, 0.263118, 0.301511, 0.329007, 0.344612, + 0.347761, 0.338341, 0.316693, 0.283599, 0.240255, 0.188227, 0.129396, 0.065889, + 0.065889, 0.188227, 0.283599, 0.338341, 0.344612, 0.301511, 0.215215, 0.098087, + -0.033094, -0.159534, -0.263118, -0.329007, -0.347761, -0.316693, -0.240255, -0.129396, + 0.098087, 0.263118, 0.344612, 0.316693, 0.188227, 0.000000, -0.188227, -0.316693, + -0.344612, -0.263118, -0.098087, 0.098087, 0.263118, 0.344612, 0.316693, 0.188227, + 0.129396, 0.316693, 0.329007, 0.159534, -0.098087, -0.301511, -0.338341, -0.188227, + 0.065889, 0.283599, 0.344612, 0.215215, -0.033094, -0.263118, -0.347761, -0.240255, + 0.159534, 0.344612, 0.240255, -0.065889, -0.316693, -0.301511, -0.033094, 0.263118, + 0.338341, 0.129396, -0.188227, -0.347761, -0.215215, 0.098087, 0.329007, 0.283599, + 0.188227, 0.344612, 0.098087, -0.263118, -0.316693, -0.000000, 0.316693, 0.263118, + -0.098087, -0.344612, -0.188227, 0.188227, 0.344612, 0.098087, -0.263118, -0.316693, + 0.215215, 0.316693, -0.065889, -0.347761, -0.098087, 0.301511, 0.240255, -0.188227, + -0.329007, 0.033094, 0.344612, 0.129396, -0.283599, -0.263118, 0.159534, 0.338341, + 0.240255, 0.263118, -0.215215, -0.283599, 0.188227, 0.301511, -0.159534, -0.316693, + 0.129396, 0.329007, -0.098087, -0.338341, 0.065889, 0.344612, -0.033094, -0.347761, + 0.263118, 0.188227, -0.316693, -0.098087, 0.344612, 0.000000, -0.344612, 0.098087, + 0.316693, -0.188227, -0.263118, 0.263118, 0.188227, -0.316693, -0.098087, 0.344612, + 0.283599, 0.098087, -0.347761, 0.129396, 0.263118, -0.301511, -0.065889, 0.344612, + -0.159534, -0.240255, 0.316693, 0.033094, -0.338341, 0.188227, 0.215215, -0.329007, + 0.301511, 0.000000, -0.301511, 0.301511, 0.000000, -0.301511, 0.301511, 0.000000, + -0.301511, 0.301511, 0.000000, -0.301511, 0.301511, 0.000000, -0.301511, 0.301511, + 0.316693, -0.098087, -0.188227, 0.344612, -0.263118, -0.000000, 0.263118, -0.344612, + 0.188227, 0.098087, -0.316693, 0.316693, -0.098087, -0.188227, 0.344612, -0.263118, + 0.329007, -0.188227, -0.033094, 0.240255, -0.344612, 0.301511, -0.129396, -0.098087, + 0.283599, -0.347761, 0.263118, -0.065889, -0.159534, 0.316693, -0.338341, 0.215215, + 0.338341, -0.263118, 0.129396, 0.033094, -0.188227, 0.301511, -0.347761, 0.316693, + -0.215215, 0.065889, 0.098087, -0.240255, 0.329007, -0.344612, 0.283599, -0.159534, + 0.344612, -0.316693, 0.263118, -0.188227, 0.098087, 0.000000, -0.098087, 0.188227, + -0.263118, 0.316693, -0.344612, 0.344612, -0.316693, 0.263118, -0.188227, 0.098087, + 0.347761, -0.344612, 0.338341, -0.329007, 0.316693, -0.301511, 0.283599, -0.263118, + 0.240255, -0.215215, 0.188227, -0.159534, 0.129396, -0.098087, 0.065889, -0.033094 +}; + +static const int16_t idct_i16[256] = { + 4096, 5765, 5681, 5543, 5352, 5109, 4816, 4478, + 4096, 3675, 3218, 2731, 2217, 1682, 1130, 568, + 4096, 5543, 4816, 3675, 2217, 568, -1130, -2731, + -4096, -5109, -5681, -5765, -5352, -4478, -3218, -1682, + 4096, 5109, 3218, 568, -2217, -4478, -5681, -5543, + -4096, -1682, 1130, 3675, 5352, 5765, 4816, 2731, + 4096, 4478, 1130, -2731, -5352, -5543, -3218, 568, + 4096, 5765, 4816, 1682, -2217, -5109, -5681, -3675, + 4096, 3675, -1130, -5109, -5352, -1682, 3218, 5765, + 4096, -568, -4816, -5543, -2217, 2731, 5681, 4478, + 4096, 2731, -3218, -5765, -2217, 3675, 5681, 1682, + -4096, -5543, -1130, 4478, 5352, 568, -4816, -5109, + 4096, 1682, -4816, -4478, 2217, 5765, 1130, -5109, + -4096, 2731, 5681, 568, -5352, -3675, 3218, 5543, + 4096, 568, -5681, -1682, 5352, 2731, -4816, -3675, + 4096, 4478, -3218, -5109, 2217, 5543, -1130, -5765, + 4096, -568, -5681, 1682, 5352, -2731, -4816, 3675, + 4096, -4478, -3218, 5109, 2217, -5543, -1130, 5765, + 4096, -1682, -4816, 4478, 2217, -5765, 1130, 5109, + -4096, -2731, 5681, -568, -5352, 3675, 3218, -5543, + 4096, -2731, -3218, 5765, -2217, -3675, 5681, -1682, + -4096, 5543, -1130, -4478, 5352, -568, -4816, 5109, + 4096, -3675, -1130, 5109, -5352, 1682, 3218, -5765, + 4096, 568, -4816, 5543, -2217, -2731, 5681, -4478, + 4096, -4478, 1130, 2731, -5352, 5543, -3218, -568, + 4096, -5765, 4816, -1682, -2217, 5109, -5681, 3675, + 4096, -5109, 3218, -568, -2217, 4478, -5681, 5543, + -4096, 1682, 1130, -3675, 5352, -5765, 4816, -2731, + 4096, -5543, 4816, -3675, 2217, -568, -1130, 2731, + -4096, 5109, -5681, 5765, -5352, 4478, -3218, 1682, + 4096, -5765, 5681, -5543, 5352, -5109, 4816, -4478, + 4096, -3675, 3218, -2731, 2217, -1682, 1130, -568 +}; + +static const int16_t iadst_i16[256] = { + 542, 1607, 2614, 3526, 4311, 4940, 5390, 5646, + 5698, 5543, 5189, 4646, 3936, 3084, 2120, 1080, + 1080, 3084, 4646, 5543, 5646, 4940, 3526, 1607, + -542, -2614, -4311, -5390, -5698, -5189, -3936, -2120, + 1607, 4311, 5646, 5189, 3084, 0, -3084, -5189, + -5646, -4311, -1607, 1607, 4311, 5646, 5189, 3084, + 2120, 5189, 5390, 2614, -1607, -4940, -5543, -3084, + 1080, 4646, 5646, 3526, -542, -4311, -5698, -3936, + 2614, 5646, 3936, -1080, -5189, -4940, -542, 4311, + 5543, 2120, -3084, -5698, -3526, 1607, 5390, 4646, + 3084, 5646, 1607, -4311, -5189, 0, 5189, 4311, + -1607, -5646, -3084, 3084, 5646, 1607, -4311, -5189, + 3526, 5189, -1080, -5698, -1607, 4940, 3936, -3084, + -5390, 542, 5646, 2120, -4646, -4311, 2614, 5543, + 3936, 4311, -3526, -4646, 3084, 4940, -2614, -5189, + 2120, 5390, -1607, -5543, 1080, 5646, -542, -5698, + 4311, 3084, -5189, -1607, 5646, 0, -5646, 1607, + 5189, -3084, -4311, 4311, 3084, -5189, -1607, 5646, + 4646, 1607, -5698, 2120, 4311, -4940, -1080, 5646, + -2614, -3936, 5189, 542, -5543, 3084, 3526, -5390, + 4940, 0, -4940, 4940, 0, -4940, 4940, 0, + -4940, 4940, 0, -4940, 4940, 0, -4940, 4940, + 5189, -1607, -3084, 5646, -4311, 0, 4311, -5646, + 3084, 1607, -5189, 5189, -1607, -3084, 5646, -4311, + 5390, -3084, -542, 3936, -5646, 4940, -2120, -1607, + 4646, -5698, 4311, -1080, -2614, 5189, -5543, 3526, + 5543, -4311, 2120, 542, -3084, 4940, -5698, 5189, + -3526, 1080, 1607, -3936, 5390, -5646, 4646, -2614, + 5646, -5189, 4311, -3084, 1607, 0, -1607, 3084, + -4311, 5189, -5646, 5646, -5189, 4311, -3084, 1607, + 5698, -5646, 5543, -5390, 5189, -4940, 4646, -4311, + 3936, -3526, 3084, -2614, 2120, -1607, 1080, -542 +}; + +/* For test */ +#define TEST_INT 1 +#if TEST_INT +#define vp9_ihtllm_int_c vp9_ihtllm_c +#else +#define vp9_ihtllm_float_c vp9_ihtllm_c +#endif + +void vp9_ihtllm_float_c(const int16_t *input, int16_t *output, int pitch, + TX_TYPE tx_type, int tx_dim) { + vp9_clear_system_state(); // Make it simd safe : __asm emms; + { + int i, j, k; + float bufa[256], bufb[256]; // buffers are for floating-point test purpose + // the implementation could be simplified in + // conjunction with integer transform + const int16_t *ip = input; + int16_t *op = output; + int shortpitch = pitch >> 1; + + float *pfa = &bufa[0]; + float *pfb = &bufb[0]; + + // pointers to vertical and horizontal transforms + const float *ptv, *pth; + + assert(tx_type != DCT_DCT); + // load and convert residual array into floating-point + for(j = 0; j < tx_dim; j++) { + for(i = 0; i < tx_dim; i++) { + pfa[i] = (float)ip[i]; + } + pfa += tx_dim; + ip += tx_dim; + } + + // vertical transformation + pfa = &bufa[0]; + pfb = &bufb[0]; + + switch(tx_type) { + case ADST_ADST : + case ADST_DCT : + ptv = (tx_dim == 4) ? &iadst_4[0] : + ((tx_dim == 8) ? &iadst_8[0] : &iadst_16[0]); + break; + + default : + ptv = (tx_dim == 4) ? &idct_4[0] : + ((tx_dim == 8) ? &idct_8[0] : &idct_16[0]); + break; + } + + for(j = 0; j < tx_dim; j++) { + for(i = 0; i < tx_dim; i++) { + pfb[i] = 0 ; + for(k = 0; k < tx_dim; k++) { + pfb[i] += ptv[k] * pfa[(k * tx_dim)]; + } + pfa += 1; + } + + pfb += tx_dim; + ptv += tx_dim; + pfa = &bufa[0]; + } + + // horizontal transformation + pfa = &bufa[0]; + pfb = &bufb[0]; + + switch(tx_type) { + case ADST_ADST : + case DCT_ADST : + pth = (tx_dim == 4) ? &iadst_4[0] : + ((tx_dim == 8) ? &iadst_8[0] : &iadst_16[0]); + break; + + default : + pth = (tx_dim == 4) ? &idct_4[0] : + ((tx_dim == 8) ? &idct_8[0] : &idct_16[0]); + break; + } + + for(j = 0; j < tx_dim; j++) { + for(i = 0; i < tx_dim; i++) { + pfa[i] = 0; + for(k = 0; k < tx_dim; k++) { + pfa[i] += pfb[k] * pth[k]; + } + pth += tx_dim; + } + + pfa += tx_dim; + pfb += tx_dim; + + switch(tx_type) { + case ADST_ADST : + case DCT_ADST : + pth = (tx_dim == 4) ? &iadst_4[0] : + ((tx_dim == 8) ? &iadst_8[0] : &iadst_16[0]); + break; + + default : + pth = (tx_dim == 4) ? &idct_4[0] : + ((tx_dim == 8) ? &idct_8[0] : &idct_16[0]); + break; + } + } + + // convert to short integer format and load BLOCKD buffer + op = output; + pfa = &bufa[0]; + + for(j = 0; j < tx_dim; j++) { + for(i = 0; i < tx_dim; i++) { + op[i] = (pfa[i] > 0 ) ? (int16_t)( pfa[i] / 8 + 0.49) : + -(int16_t)( - pfa[i] / 8 + 0.49); + } + + op += shortpitch; + pfa += tx_dim; + } + } + vp9_clear_system_state(); // Make it simd safe : __asm emms; +} + +/* Converted the transforms to integer form. */ +#define VERTICAL_SHIFT 14 // 16 +#define VERTICAL_ROUNDING ((1 << (VERTICAL_SHIFT - 1)) - 1) +#define HORIZONTAL_SHIFT 17 // 15 +#define HORIZONTAL_ROUNDING ((1 << (HORIZONTAL_SHIFT - 1)) - 1) +void vp9_ihtllm_int_c(const int16_t *input, int16_t *output, int pitch, + TX_TYPE tx_type, int tx_dim) { + int i, j, k; + int16_t imbuf[256]; + + const int16_t *ip = input; + int16_t *op = output; + int16_t *im = &imbuf[0]; + + /* pointers to vertical and horizontal transforms. */ + const int16_t *ptv = NULL, *pth = NULL; + int shortpitch = pitch >> 1; + + switch (tx_type) { + case ADST_ADST : + ptv = pth = (tx_dim == 4) ? &iadst_i4[0] + : ((tx_dim == 8) ? &iadst_i8[0] + : &iadst_i16[0]); + break; + case ADST_DCT : + ptv = (tx_dim == 4) ? &iadst_i4[0] + : ((tx_dim == 8) ? &iadst_i8[0] : &iadst_i16[0]); + pth = (tx_dim == 4) ? &idct_i4[0] + : ((tx_dim == 8) ? &idct_i8[0] : &idct_i16[0]); + break; + case DCT_ADST : + ptv = (tx_dim == 4) ? &idct_i4[0] + : ((tx_dim == 8) ? &idct_i8[0] : &idct_i16[0]); + pth = (tx_dim == 4) ? &iadst_i4[0] + : ((tx_dim == 8) ? &iadst_i8[0] : &iadst_i16[0]); + break; + case DCT_DCT : + ptv = pth = (tx_dim == 4) ? &idct_i4[0] + : ((tx_dim == 8) ? &idct_i8[0] + : &idct_i16[0]); + break; + default: + assert(0); + break; + } + + /* vertical transformation */ + for (j = 0; j < tx_dim; j++) { + for (i = 0; i < tx_dim; i++) { + int temp = 0; + + for (k = 0; k < tx_dim; k++) { + temp += ptv[k] * ip[(k * tx_dim)]; + } + + im[i] = (int16_t)((temp + VERTICAL_ROUNDING) >> VERTICAL_SHIFT); + ip++; + } + im += tx_dim; // 16 + ptv += tx_dim; + ip = input; + } + + /* horizontal transformation */ + im = &imbuf[0]; + + for (j = 0; j < tx_dim; j++) { + const int16_t *pthc = pth; + + for (i = 0; i < tx_dim; i++) { + int temp = 0; + + for (k = 0; k < tx_dim; k++) { + temp += im[k] * pthc[k]; + } + + op[i] = (int16_t)((temp + HORIZONTAL_ROUNDING) >> HORIZONTAL_SHIFT); + pthc += tx_dim; + } + + im += tx_dim; // 16 + op += shortpitch; + } +} + +void vp9_short_idct4x4llm_c(short *input, short *output, int pitch) { + int i; + int a1, b1, c1, d1; + + short *ip = input; + short *op = output; + int temp1, temp2; + int shortpitch = pitch >> 1; + + for (i = 0; i < 4; i++) { + a1 = ip[0] + ip[8]; + b1 = ip[0] - ip[8]; + + temp1 = (ip[4] * sinpi8sqrt2 + rounding) >> 16; + temp2 = ip[12] + ((ip[12] * cospi8sqrt2minus1 + rounding) >> 16); + c1 = temp1 - temp2; + + temp1 = ip[4] + ((ip[4] * cospi8sqrt2minus1 + rounding) >> 16); + temp2 = (ip[12] * sinpi8sqrt2 + rounding) >> 16; + d1 = temp1 + temp2; + + op[shortpitch * 0] = a1 + d1; + op[shortpitch * 3] = a1 - d1; + + op[shortpitch * 1] = b1 + c1; + op[shortpitch * 2] = b1 - c1; + + ip++; + op++; + } + + ip = output; + op = output; + + for (i = 0; i < 4; i++) { + a1 = ip[0] + ip[2]; + b1 = ip[0] - ip[2]; + + temp1 = (ip[1] * sinpi8sqrt2 + rounding) >> 16; + temp2 = ip[3] + ((ip[3] * cospi8sqrt2minus1 + rounding) >> 16); + c1 = temp1 - temp2; + + temp1 = ip[1] + ((ip[1] * cospi8sqrt2minus1 + rounding) >> 16); + temp2 = (ip[3] * sinpi8sqrt2 + rounding) >> 16; + d1 = temp1 + temp2; + + op[0] = (a1 + d1 + 16) >> 5; + op[3] = (a1 - d1 + 16) >> 5; + + op[1] = (b1 + c1 + 16) >> 5; + op[2] = (b1 - c1 + 16) >> 5; + + ip += shortpitch; + op += shortpitch; + } +} + +void vp9_short_idct4x4llm_1_c(short *input, short *output, int pitch) { + int i; + int a1; + short *op = output; + int shortpitch = pitch >> 1; + a1 = ((input[0] + 16) >> 5); + for (i = 0; i < 4; i++) { + op[0] = a1; + op[1] = a1; + op[2] = a1; + op[3] = a1; + op += shortpitch; + } +} + +void vp9_dc_only_idct_add_c(short input_dc, unsigned char *pred_ptr, + unsigned char *dst_ptr, int pitch, int stride) { + int a1 = ((input_dc + 16) >> 5); + int r, c; + + for (r = 0; r < 4; r++) { + for (c = 0; c < 4; c++) { + int a = a1 + pred_ptr[c]; + + if (a < 0) + a = 0; + + if (a > 255) + a = 255; + + dst_ptr[c] = (unsigned char) a; + } + + dst_ptr += stride; + pred_ptr += pitch; + } +} + +void vp9_short_inv_walsh4x4_c(short *input, short *output) { + int i; + int a1, b1, c1, d1; + short *ip = input; + short *op = output; + + for (i = 0; i < 4; i++) { + a1 = ((ip[0] + ip[3])); + b1 = ((ip[1] + ip[2])); + c1 = ((ip[1] - ip[2])); + d1 = ((ip[0] - ip[3])); + + op[0] = (a1 + b1 + 1) >> 1; + op[1] = (c1 + d1) >> 1; + op[2] = (a1 - b1) >> 1; + op[3] = (d1 - c1) >> 1; + + ip += 4; + op += 4; + } + + ip = output; + op = output; + for (i = 0; i < 4; i++) { + a1 = ip[0] + ip[12]; + b1 = ip[4] + ip[8]; + c1 = ip[4] - ip[8]; + d1 = ip[0] - ip[12]; + op[0] = (a1 + b1 + 1) >> 1; + op[4] = (c1 + d1) >> 1; + op[8] = (a1 - b1) >> 1; + op[12] = (d1 - c1) >> 1; + ip++; + op++; + } +} + +void vp9_short_inv_walsh4x4_1_c(short *in, short *out) { + int i; + short tmp[4]; + short *ip = in; + short *op = tmp; + + op[0] = (ip[0] + 1) >> 1; + op[1] = op[2] = op[3] = (ip[0] >> 1); + + ip = tmp; + op = out; + for (i = 0; i < 4; i++) { + op[0] = (ip[0] + 1) >> 1; + op[4] = op[8] = op[12] = (ip[0] >> 1); + ip++; + op++; + } +} + +#if CONFIG_LOSSLESS +void vp9_short_inv_walsh4x4_lossless_c(short *input, short *output) { + int i; + int a1, b1, c1, d1; + short *ip = input; + short *op = output; + + for (i = 0; i < 4; i++) { + a1 = ((ip[0] + ip[3])) >> Y2_WHT_UPSCALE_FACTOR; + b1 = ((ip[1] + ip[2])) >> Y2_WHT_UPSCALE_FACTOR; + c1 = ((ip[1] - ip[2])) >> Y2_WHT_UPSCALE_FACTOR; + d1 = ((ip[0] - ip[3])) >> Y2_WHT_UPSCALE_FACTOR; + + op[0] = (a1 + b1 + 1) >> 1; + op[1] = (c1 + d1) >> 1; + op[2] = (a1 - b1) >> 1; + op[3] = (d1 - c1) >> 1; + + ip += 4; + op += 4; + } + + ip = output; + op = output; + for (i = 0; i < 4; i++) { + a1 = ip[0] + ip[12]; + b1 = ip[4] + ip[8]; + c1 = ip[4] - ip[8]; + d1 = ip[0] - ip[12]; + + + op[0] = ((a1 + b1 + 1) >> 1) << Y2_WHT_UPSCALE_FACTOR; + op[4] = ((c1 + d1) >> 1) << Y2_WHT_UPSCALE_FACTOR; + op[8] = ((a1 - b1) >> 1) << Y2_WHT_UPSCALE_FACTOR; + op[12] = ((d1 - c1) >> 1) << Y2_WHT_UPSCALE_FACTOR; + + ip++; + op++; + } +} + +void vp9_short_inv_walsh4x4_1_lossless_c(short *in, short *out) { + int i; + short tmp[4]; + short *ip = in; + short *op = tmp; + + op[0] = ((ip[0] >> Y2_WHT_UPSCALE_FACTOR) + 1) >> 1; + op[1] = op[2] = op[3] = ((ip[0] >> Y2_WHT_UPSCALE_FACTOR) >> 1); + + ip = tmp; + op = out; + for (i = 0; i < 4; i++) { + op[0] = ((ip[0] + 1) >> 1) << Y2_WHT_UPSCALE_FACTOR; + op[4] = op[8] = op[12] = ((ip[0] >> 1)) << Y2_WHT_UPSCALE_FACTOR; + ip++; + op++; + } +} + +void vp9_short_inv_walsh4x4_x8_c(short *input, short *output, int pitch) { + int i; + int a1, b1, c1, d1; + short *ip = input; + short *op = output; + int shortpitch = pitch >> 1; + + for (i = 0; i < 4; i++) { + a1 = ((ip[0] + ip[3])) >> WHT_UPSCALE_FACTOR; + b1 = ((ip[1] + ip[2])) >> WHT_UPSCALE_FACTOR; + c1 = ((ip[1] - ip[2])) >> WHT_UPSCALE_FACTOR; + d1 = ((ip[0] - ip[3])) >> WHT_UPSCALE_FACTOR; + + op[0] = (a1 + b1 + 1) >> 1; + op[1] = (c1 + d1) >> 1; + op[2] = (a1 - b1) >> 1; + op[3] = (d1 - c1) >> 1; + + ip += 4; + op += shortpitch; + } + + ip = output; + op = output; + for (i = 0; i < 4; i++) { + a1 = ip[shortpitch * 0] + ip[shortpitch * 3]; + b1 = ip[shortpitch * 1] + ip[shortpitch * 2]; + c1 = ip[shortpitch * 1] - ip[shortpitch * 2]; + d1 = ip[shortpitch * 0] - ip[shortpitch * 3]; + + + op[shortpitch * 0] = (a1 + b1 + 1) >> 1; + op[shortpitch * 1] = (c1 + d1) >> 1; + op[shortpitch * 2] = (a1 - b1) >> 1; + op[shortpitch * 3] = (d1 - c1) >> 1; + + ip++; + op++; + } +} + +void vp9_short_inv_walsh4x4_1_x8_c(short *in, short *out, int pitch) { + int i; + short tmp[4]; + short *ip = in; + short *op = tmp; + int shortpitch = pitch >> 1; + + op[0] = ((ip[0] >> WHT_UPSCALE_FACTOR) + 1) >> 1; + op[1] = op[2] = op[3] = ((ip[0] >> WHT_UPSCALE_FACTOR) >> 1); + + + ip = tmp; + op = out; + for (i = 0; i < 4; i++) { + op[shortpitch * 0] = (ip[0] + 1) >> 1; + op[shortpitch * 1] = op[shortpitch * 2] = op[shortpitch * 3] = ip[0] >> 1; + ip++; + op++; + } +} + +void vp9_dc_only_inv_walsh_add_c(short input_dc, unsigned char *pred_ptr, + unsigned char *dst_ptr, + int pitch, int stride) { + int r, c; + short tmp[16]; + vp9_short_inv_walsh4x4_1_x8_c(&input_dc, tmp, 4 << 1); + + for (r = 0; r < 4; r++) { + for (c = 0; c < 4; c++) { + int a = tmp[r * 4 + c] + pred_ptr[c]; + if (a < 0) + a = 0; + + if (a > 255) + a = 255; + + dst_ptr[c] = (unsigned char) a; + } + + dst_ptr += stride; + pred_ptr += pitch; + } +} +#endif + +void vp9_dc_only_idct_add_8x8_c(short input_dc, + unsigned char *pred_ptr, + unsigned char *dst_ptr, + int pitch, int stride) { + int a1 = ((input_dc + 16) >> 5); + int r, c, b; + unsigned char *orig_pred = pred_ptr; + unsigned char *orig_dst = dst_ptr; + for (b = 0; b < 4; b++) { + for (r = 0; r < 4; r++) { + for (c = 0; c < 4; c++) { + int a = a1 + pred_ptr[c]; + + if (a < 0) + a = 0; + + if (a > 255) + a = 255; + + dst_ptr[c] = (unsigned char) a; + } + + dst_ptr += stride; + pred_ptr += pitch; + } + dst_ptr = orig_dst + (b + 1) % 2 * 4 + (b + 1) / 2 * 4 * stride; + pred_ptr = orig_pred + (b + 1) % 2 * 4 + (b + 1) / 2 * 4 * pitch; + } +} + +#define W1 2841 /* 2048*sqrt(2)*cos(1*pi/16) */ +#define W2 2676 /* 2048*sqrt(2)*cos(2*pi/16) */ +#define W3 2408 /* 2048*sqrt(2)*cos(3*pi/16) */ +#define W5 1609 /* 2048*sqrt(2)*cos(5*pi/16) */ +#define W6 1108 /* 2048*sqrt(2)*cos(6*pi/16) */ +#define W7 565 /* 2048*sqrt(2)*cos(7*pi/16) */ + +/* row (horizontal) IDCT + * + * 7 pi 1 dst[k] = sum c[l] * src[l] * cos( -- * + * ( k + - ) * l ) l=0 8 2 + * + * where: c[0] = 128 c[1..7] = 128*sqrt(2) */ + +static void idctrow(int *blk) { + int x0, x1, x2, x3, x4, x5, x6, x7, x8; + /* shortcut */ + if (!((x1 = blk[4] << 11) | (x2 = blk[6]) | (x3 = blk[2]) | + (x4 = blk[1]) | (x5 = blk[7]) | (x6 = blk[5]) | (x7 = blk[3]))) { + blk[0] = blk[1] = blk[2] = blk[3] = blk[4] + = blk[5] = blk[6] = blk[7] = blk[0] << 3; + return; + } + + x0 = (blk[0] << 11) + 128; /* for proper rounding in the fourth stage */ + /* first stage */ + x8 = W7 * (x4 + x5); + x4 = x8 + (W1 - W7) * x4; + x5 = x8 - (W1 + W7) * x5; + x8 = W3 * (x6 + x7); + x6 = x8 - (W3 - W5) * x6; + x7 = x8 - (W3 + W5) * x7; + + /* second stage */ + x8 = x0 + x1; + x0 -= x1; + x1 = W6 * (x3 + x2); + x2 = x1 - (W2 + W6) * x2; + x3 = x1 + (W2 - W6) * x3; + x1 = x4 + x6; + x4 -= x6; + x6 = x5 + x7; + x5 -= x7; + + /* third stage */ + x7 = x8 + x3; + x8 -= x3; + x3 = x0 + x2; + x0 -= x2; + x2 = (181 * (x4 + x5) + 128) >> 8; + x4 = (181 * (x4 - x5) + 128) >> 8; + + /* fourth stage */ + blk[0] = (x7 + x1) >> 8; + blk[1] = (x3 + x2) >> 8; + blk[2] = (x0 + x4) >> 8; + blk[3] = (x8 + x6) >> 8; + blk[4] = (x8 - x6) >> 8; + blk[5] = (x0 - x4) >> 8; + blk[6] = (x3 - x2) >> 8; + blk[7] = (x7 - x1) >> 8; +} + +/* column (vertical) IDCT + * + * 7 pi 1 dst[8*k] = sum c[l] * src[8*l] * + * cos( -- * ( k + - ) * l ) l=0 8 2 + * + * where: c[0] = 1/1024 c[1..7] = (1/1024)*sqrt(2) */ +static void idctcol(int *blk) { + int x0, x1, x2, x3, x4, x5, x6, x7, x8; + + /* shortcut */ + if (!((x1 = (blk[8 * 4] << 8)) | (x2 = blk[8 * 6]) | (x3 = blk[8 * 2]) | + (x4 = blk[8 * 1]) | (x5 = blk[8 * 7]) | (x6 = blk[8 * 5]) | + (x7 = blk[8 * 3]))) { + blk[8 * 0] = blk[8 * 1] = blk[8 * 2] = blk[8 * 3] + = blk[8 * 4] = blk[8 * 5] = blk[8 * 6] + = blk[8 * 7] = ((blk[8 * 0] + 32) >> 6); + return; + } + + x0 = (blk[8 * 0] << 8) + 16384; + + /* first stage */ + x8 = W7 * (x4 + x5) + 4; + x4 = (x8 + (W1 - W7) * x4) >> 3; + x5 = (x8 - (W1 + W7) * x5) >> 3; + x8 = W3 * (x6 + x7) + 4; + x6 = (x8 - (W3 - W5) * x6) >> 3; + x7 = (x8 - (W3 + W5) * x7) >> 3; + + /* second stage */ + x8 = x0 + x1; + x0 -= x1; + x1 = W6 * (x3 + x2) + 4; + x2 = (x1 - (W2 + W6) * x2) >> 3; + x3 = (x1 + (W2 - W6) * x3) >> 3; + x1 = x4 + x6; + x4 -= x6; + x6 = x5 + x7; + x5 -= x7; + + /* third stage */ + x7 = x8 + x3; + x8 -= x3; + x3 = x0 + x2; + x0 -= x2; + x2 = (181 * (x4 + x5) + 128) >> 8; + x4 = (181 * (x4 - x5) + 128) >> 8; + + /* fourth stage */ + blk[8 * 0] = (x7 + x1) >> 14; + blk[8 * 1] = (x3 + x2) >> 14; + blk[8 * 2] = (x0 + x4) >> 14; + blk[8 * 3] = (x8 + x6) >> 14; + blk[8 * 4] = (x8 - x6) >> 14; + blk[8 * 5] = (x0 - x4) >> 14; + blk[8 * 6] = (x3 - x2) >> 14; + blk[8 * 7] = (x7 - x1) >> 14; +} + +#define TX_DIM 8 +void vp9_short_idct8x8_c(short *coefs, short *block, int pitch) { + int X[TX_DIM * TX_DIM]; + int i, j; + int shortpitch = pitch >> 1; + + for (i = 0; i < TX_DIM; i++) { + for (j = 0; j < TX_DIM; j++) { + X[i * TX_DIM + j] = (int)(coefs[i * TX_DIM + j] + 1 + + (coefs[i * TX_DIM + j] < 0)) >> 2; + } + } + for (i = 0; i < 8; i++) + idctrow(X + 8 * i); + + for (i = 0; i < 8; i++) + idctcol(X + i); + + for (i = 0; i < TX_DIM; i++) { + for (j = 0; j < TX_DIM; j++) { + block[i * shortpitch + j] = X[i * TX_DIM + j] >> 1; + } + } +} + +/* Row IDCT when only first 4 coefficients are non-zero. */ +static void idctrow10(int *blk) { + int x0, x1, x2, x3, x4, x5, x6, x7, x8; + + /* shortcut */ + if (!((x1 = blk[4] << 11) | (x2 = blk[6]) | (x3 = blk[2]) | + (x4 = blk[1]) | (x5 = blk[7]) | (x6 = blk[5]) | (x7 = blk[3]))) { + blk[0] = blk[1] = blk[2] = blk[3] = blk[4] + = blk[5] = blk[6] = blk[7] = blk[0] << 3; + return; + } + + x0 = (blk[0] << 11) + 128; /* for proper rounding in the fourth stage */ + /* first stage */ + x5 = W7 * x4; + x4 = W1 * x4; + x6 = W3 * x7; + x7 = -W5 * x7; + + /* second stage */ + x2 = W6 * x3; + x3 = W2 * x3; + x1 = x4 + x6; + x4 -= x6; + x6 = x5 + x7; + x5 -= x7; + + /* third stage */ + x7 = x0 + x3; + x8 = x0 - x3; + x3 = x0 + x2; + x0 -= x2; + x2 = (181 * (x4 + x5) + 128) >> 8; + x4 = (181 * (x4 - x5) + 128) >> 8; + + /* fourth stage */ + blk[0] = (x7 + x1) >> 8; + blk[1] = (x3 + x2) >> 8; + blk[2] = (x0 + x4) >> 8; + blk[3] = (x8 + x6) >> 8; + blk[4] = (x8 - x6) >> 8; + blk[5] = (x0 - x4) >> 8; + blk[6] = (x3 - x2) >> 8; + blk[7] = (x7 - x1) >> 8; +} + +/* Column (vertical) IDCT when only first 4 coefficients are non-zero. */ +static void idctcol10(int *blk) { + int x0, x1, x2, x3, x4, x5, x6, x7, x8; + + /* shortcut */ + if (!((x1 = (blk[8 * 4] << 8)) | (x2 = blk[8 * 6]) | (x3 = blk[8 * 2]) | + (x4 = blk[8 * 1]) | (x5 = blk[8 * 7]) | (x6 = blk[8 * 5]) | + (x7 = blk[8 * 3]))) { + blk[8 * 0] = blk[8 * 1] = blk[8 * 2] = blk[8 * 3] + = blk[8 * 4] = blk[8 * 5] = blk[8 * 6] + = blk[8 * 7] = ((blk[8 * 0] + 32) >> 6); + return; + } + + x0 = (blk[8 * 0] << 8) + 16384; + + /* first stage */ + x5 = (W7 * x4 + 4) >> 3; + x4 = (W1 * x4 + 4) >> 3; + x6 = (W3 * x7 + 4) >> 3; + x7 = (-W5 * x7 + 4) >> 3; + + /* second stage */ + x2 = (W6 * x3 + 4) >> 3; + x3 = (W2 * x3 + 4) >> 3; + x1 = x4 + x6; + x4 -= x6; + x6 = x5 + x7; + x5 -= x7; + + /* third stage */ + x7 = x0 + x3; + x8 = x0 - x3; + x3 = x0 + x2; + x0 -= x2; + x2 = (181 * (x4 + x5) + 128) >> 8; + x4 = (181 * (x4 - x5) + 128) >> 8; + + /* fourth stage */ + blk[8 * 0] = (x7 + x1) >> 14; + blk[8 * 1] = (x3 + x2) >> 14; + blk[8 * 2] = (x0 + x4) >> 14; + blk[8 * 3] = (x8 + x6) >> 14; + blk[8 * 4] = (x8 - x6) >> 14; + blk[8 * 5] = (x0 - x4) >> 14; + blk[8 * 6] = (x3 - x2) >> 14; + blk[8 * 7] = (x7 - x1) >> 14; +} + +void vp9_short_idct10_8x8_c(short *coefs, short *block, int pitch) { + int X[TX_DIM * TX_DIM]; + int i, j; + int shortpitch = pitch >> 1; + + for (i = 0; i < TX_DIM; i++) { + for (j = 0; j < TX_DIM; j++) { + X[i * TX_DIM + j] = (int)(coefs[i * TX_DIM + j] + 1 + + (coefs[i * TX_DIM + j] < 0)) >> 2; + } + } + + /* Do first 4 row idct only since non-zero dct coefficients are all in + * upper-left 4x4 area. */ + for (i = 0; i < 4; i++) + idctrow10(X + 8 * i); + + for (i = 0; i < 8; i++) + idctcol10(X + i); + + for (i = 0; i < TX_DIM; i++) { + for (j = 0; j < TX_DIM; j++) { + block[i * shortpitch + j] = X[i * TX_DIM + j] >> 1; + } + } +} + +void vp9_short_ihaar2x2_c(short *input, short *output, int pitch) { + int i; + short *ip = input; // 0,1, 4, 8 + short *op = output; + for (i = 0; i < 16; i++) { + op[i] = 0; + } + + op[0] = (ip[0] + ip[1] + ip[4] + ip[8] + 1) >> 1; + op[1] = (ip[0] - ip[1] + ip[4] - ip[8]) >> 1; + op[4] = (ip[0] + ip[1] - ip[4] - ip[8]) >> 1; + op[8] = (ip[0] - ip[1] - ip[4] + ip[8]) >> 1; +} + + +#if 0 +// Keep a really bad float version as reference for now. +void vp9_short_idct16x16_c(short *input, short *output, int pitch) { + + vp9_clear_system_state(); // Make it simd safe : __asm emms; + { + double x; + const int short_pitch = pitch >> 1; + int i, j, k, l; + for (l = 0; l < 16; ++l) { + for (k = 0; k < 16; ++k) { + double s = 0; + for (i = 0; i < 16; ++i) { + for (j = 0; j < 16; ++j) { + x=cos(PI*j*(l+0.5)/16.0)*cos(PI*i*(k+0.5)/16.0)*input[i*16+j]/32; + if (i != 0) + x *= sqrt(2.0); + if (j != 0) + x *= sqrt(2.0); + s += x; + } + } + output[k*short_pitch+l] = (short)round(s); + } + } + } + vp9_clear_system_state(); // Make it simd safe : __asm emms; +} +#endif + +#define TEST_INT_16x16_IDCT 1 +#if !TEST_INT_16x16_IDCT +static const double C1 = 0.995184726672197; +static const double C2 = 0.98078528040323; +static const double C3 = 0.956940335732209; +static const double C4 = 0.923879532511287; +static const double C5 = 0.881921264348355; +static const double C6 = 0.831469612302545; +static const double C7 = 0.773010453362737; +static const double C8 = 0.707106781186548; +static const double C9 = 0.634393284163646; +static const double C10 = 0.555570233019602; +static const double C11 = 0.471396736825998; +static const double C12 = 0.38268343236509; +static const double C13 = 0.290284677254462; +static const double C14 = 0.195090322016128; +static const double C15 = 0.098017140329561; + + +static void butterfly_16x16_idct_1d(double input[16], double output[16]) { + + vp9_clear_system_state(); // Make it simd safe : __asm emms; + { + double step[16]; + double intermediate[16]; + double temp1, temp2; + + + // step 1 and 2 + step[ 0] = input[0] + input[8]; + step[ 1] = input[0] - input[8]; + + temp1 = input[4]*C12; + temp2 = input[12]*C4; + + temp1 -= temp2; + temp1 *= C8; + + step[ 2] = 2*(temp1); + + temp1 = input[4]*C4; + temp2 = input[12]*C12; + temp1 += temp2; + temp1 = (temp1); + temp1 *= C8; + step[ 3] = 2*(temp1); + + temp1 = input[2]*C8; + temp1 = 2*(temp1); + temp2 = input[6] + input[10]; + + step[ 4] = temp1 + temp2; + step[ 5] = temp1 - temp2; + + temp1 = input[14]*C8; + temp1 = 2*(temp1); + temp2 = input[6] - input[10]; + + step[ 6] = temp2 - temp1; + step[ 7] = temp2 + temp1; + + // for odd input + temp1 = input[3]*C12; + temp2 = input[13]*C4; + temp1 += temp2; + temp1 = (temp1); + temp1 *= C8; + intermediate[ 8] = 2*(temp1); + + temp1 = input[3]*C4; + temp2 = input[13]*C12; + temp2 -= temp1; + temp2 = (temp2); + temp2 *= C8; + intermediate[ 9] = 2*(temp2); + + intermediate[10] = 2*(input[9]*C8); + intermediate[11] = input[15] - input[1]; + intermediate[12] = input[15] + input[1]; + intermediate[13] = 2*((input[7]*C8)); + + temp1 = input[11]*C12; + temp2 = input[5]*C4; + temp2 -= temp1; + temp2 = (temp2); + temp2 *= C8; + intermediate[14] = 2*(temp2); + + temp1 = input[11]*C4; + temp2 = input[5]*C12; + temp1 += temp2; + temp1 = (temp1); + temp1 *= C8; + intermediate[15] = 2*(temp1); + + step[ 8] = intermediate[ 8] + intermediate[14]; + step[ 9] = intermediate[ 9] + intermediate[15]; + step[10] = intermediate[10] + intermediate[11]; + step[11] = intermediate[10] - intermediate[11]; + step[12] = intermediate[12] + intermediate[13]; + step[13] = intermediate[12] - intermediate[13]; + step[14] = intermediate[ 8] - intermediate[14]; + step[15] = intermediate[ 9] - intermediate[15]; + + // step 3 + output[0] = step[ 0] + step[ 3]; + output[1] = step[ 1] + step[ 2]; + output[2] = step[ 1] - step[ 2]; + output[3] = step[ 0] - step[ 3]; + + temp1 = step[ 4]*C14; + temp2 = step[ 7]*C2; + temp1 -= temp2; + output[4] = (temp1); + + temp1 = step[ 4]*C2; + temp2 = step[ 7]*C14; + temp1 += temp2; + output[7] = (temp1); + + temp1 = step[ 5]*C10; + temp2 = step[ 6]*C6; + temp1 -= temp2; + output[5] = (temp1); + + temp1 = step[ 5]*C6; + temp2 = step[ 6]*C10; + temp1 += temp2; + output[6] = (temp1); + + output[8] = step[ 8] + step[11]; + output[9] = step[ 9] + step[10]; + output[10] = step[ 9] - step[10]; + output[11] = step[ 8] - step[11]; + output[12] = step[12] + step[15]; + output[13] = step[13] + step[14]; + output[14] = step[13] - step[14]; + output[15] = step[12] - step[15]; + + // output 4 + step[ 0] = output[0] + output[7]; + step[ 1] = output[1] + output[6]; + step[ 2] = output[2] + output[5]; + step[ 3] = output[3] + output[4]; + step[ 4] = output[3] - output[4]; + step[ 5] = output[2] - output[5]; + step[ 6] = output[1] - output[6]; + step[ 7] = output[0] - output[7]; + + temp1 = output[8]*C7; + temp2 = output[15]*C9; + temp1 -= temp2; + step[ 8] = (temp1); + + temp1 = output[9]*C11; + temp2 = output[14]*C5; + temp1 += temp2; + step[ 9] = (temp1); + + temp1 = output[10]*C3; + temp2 = output[13]*C13; + temp1 -= temp2; + step[10] = (temp1); + + temp1 = output[11]*C15; + temp2 = output[12]*C1; + temp1 += temp2; + step[11] = (temp1); + + temp1 = output[11]*C1; + temp2 = output[12]*C15; + temp2 -= temp1; + step[12] = (temp2); + + temp1 = output[10]*C13; + temp2 = output[13]*C3; + temp1 += temp2; + step[13] = (temp1); + + temp1 = output[9]*C5; + temp2 = output[14]*C11; + temp2 -= temp1; + step[14] = (temp2); + + temp1 = output[8]*C9; + temp2 = output[15]*C7; + temp1 += temp2; + step[15] = (temp1); + + // step 5 + output[0] = (step[0] + step[15]); + output[1] = (step[1] + step[14]); + output[2] = (step[2] + step[13]); + output[3] = (step[3] + step[12]); + output[4] = (step[4] + step[11]); + output[5] = (step[5] + step[10]); + output[6] = (step[6] + step[ 9]); + output[7] = (step[7] + step[ 8]); + + output[15] = (step[0] - step[15]); + output[14] = (step[1] - step[14]); + output[13] = (step[2] - step[13]); + output[12] = (step[3] - step[12]); + output[11] = (step[4] - step[11]); + output[10] = (step[5] - step[10]); + output[9] = (step[6] - step[ 9]); + output[8] = (step[7] - step[ 8]); + } + vp9_clear_system_state(); // Make it simd safe : __asm emms; +} + +// Remove once an int version of iDCT is written +#if 0 +void reference_16x16_idct_1d(double input[16], double output[16]) { + + vp9_clear_system_state(); // Make it simd safe : __asm emms; + { + const double kPi = 3.141592653589793238462643383279502884; + const double kSqrt2 = 1.414213562373095048801688724209698; + for (int k = 0; k < 16; k++) { + output[k] = 0.0; + for (int n = 0; n < 16; n++) { + output[k] += input[n]*cos(kPi*(2*k+1)*n/32.0); + if (n == 0) + output[k] = output[k]/kSqrt2; + } + } + } + vp9_clear_system_state(); // Make it simd safe : __asm emms; +} +#endif + +void vp9_short_idct16x16_c(short *input, short *output, int pitch) { + + vp9_clear_system_state(); // Make it simd safe : __asm emms; + { + double out[16*16], out2[16*16]; + const int short_pitch = pitch >> 1; + int i, j; + // First transform rows + for (i = 0; i < 16; ++i) { + double temp_in[16], temp_out[16]; + for (j = 0; j < 16; ++j) + temp_in[j] = input[j + i*short_pitch]; + butterfly_16x16_idct_1d(temp_in, temp_out); + for (j = 0; j < 16; ++j) + out[j + i*16] = temp_out[j]; + } + // Then transform columns + for (i = 0; i < 16; ++i) { + double temp_in[16], temp_out[16]; + for (j = 0; j < 16; ++j) + temp_in[j] = out[j*16 + i]; + butterfly_16x16_idct_1d(temp_in, temp_out); + for (j = 0; j < 16; ++j) + out2[j*16 + i] = temp_out[j]; + } + for (i = 0; i < 16*16; ++i) + output[i] = round(out2[i]/128); + } + vp9_clear_system_state(); // Make it simd safe : __asm emms; +} + +#else +static const int16_t C1 = 16305; +static const int16_t C2 = 16069; +static const int16_t C3 = 15679; +static const int16_t C4 = 15137; +static const int16_t C5 = 14449; +static const int16_t C6 = 13623; +static const int16_t C7 = 12665; +static const int16_t C8 = 11585; +static const int16_t C9 = 10394; +static const int16_t C10 = 9102; +static const int16_t C11 = 7723; +static const int16_t C12 = 6270; +static const int16_t C13 = 4756; +static const int16_t C14 = 3196; +static const int16_t C15 = 1606; + +#define INITIAL_SHIFT 2 +#define INITIAL_ROUNDING (1 << (INITIAL_SHIFT - 1)) +#define RIGHT_SHIFT 14 +#define RIGHT_ROUNDING (1 << (RIGHT_SHIFT - 1)) + +static void butterfly_16x16_idct_1d(int16_t input[16], int16_t output[16], + int last_shift_bits) { + int16_t step[16]; + int intermediate[16]; + int temp1, temp2; + + int step1_shift = RIGHT_SHIFT + INITIAL_SHIFT; + int step1_rounding = 1 << (step1_shift - 1); + int last_rounding = 0; + + if (last_shift_bits > 0) + last_rounding = 1 << (last_shift_bits - 1); + + // step 1 and 2 + step[ 0] = (input[0] + input[8] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[ 1] = (input[0] - input[8] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + + temp1 = input[4] * C12; + temp2 = input[12] * C4; + temp1 = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + temp1 *= C8; + step[ 2] = (2 * (temp1) + step1_rounding) >> step1_shift; + + temp1 = input[4] * C4; + temp2 = input[12] * C12; + temp1 = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + temp1 *= C8; + step[ 3] = (2 * (temp1) + step1_rounding) >> step1_shift; + + temp1 = input[2] * C8; + temp1 = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT; + temp2 = input[6] + input[10]; + step[ 4] = (temp1 + temp2 + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[ 5] = (temp1 - temp2 + INITIAL_ROUNDING) >> INITIAL_SHIFT; + + temp1 = input[14] * C8; + temp1 = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT; + temp2 = input[6] - input[10]; + step[ 6] = (temp2 - temp1 + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[ 7] = (temp2 + temp1 + INITIAL_ROUNDING) >> INITIAL_SHIFT; + + // for odd input + temp1 = input[3] * C12; + temp2 = input[13] * C4; + temp1 = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + temp1 *= C8; + intermediate[ 8] = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = input[3] * C4; + temp2 = input[13] * C12; + temp2 = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + temp2 *= C8; + intermediate[ 9] = (2 * (temp2) + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + intermediate[10] = (2 * (input[9] * C8) + RIGHT_ROUNDING) >> RIGHT_SHIFT; + intermediate[11] = input[15] - input[1]; + intermediate[12] = input[15] + input[1]; + intermediate[13] = (2 * (input[7] * C8) + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = input[11] * C12; + temp2 = input[5] * C4; + temp2 = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + temp2 *= C8; + intermediate[14] = (2 * (temp2) + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = input[11] * C4; + temp2 = input[5] * C12; + temp1 = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + temp1 *= C8; + intermediate[15] = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + step[ 8] = (intermediate[ 8] + intermediate[14] + INITIAL_ROUNDING) + >> INITIAL_SHIFT; + step[ 9] = (intermediate[ 9] + intermediate[15] + INITIAL_ROUNDING) + >> INITIAL_SHIFT; + step[10] = (intermediate[10] + intermediate[11] + INITIAL_ROUNDING) + >> INITIAL_SHIFT; + step[11] = (intermediate[10] - intermediate[11] + INITIAL_ROUNDING) + >> INITIAL_SHIFT; + step[12] = (intermediate[12] + intermediate[13] + INITIAL_ROUNDING) + >> INITIAL_SHIFT; + step[13] = (intermediate[12] - intermediate[13] + INITIAL_ROUNDING) + >> INITIAL_SHIFT; + step[14] = (intermediate[ 8] - intermediate[14] + INITIAL_ROUNDING) + >> INITIAL_SHIFT; + step[15] = (intermediate[ 9] - intermediate[15] + INITIAL_ROUNDING) + >> INITIAL_SHIFT; + + // step 3 + output[0] = step[ 0] + step[ 3]; + output[1] = step[ 1] + step[ 2]; + output[2] = step[ 1] - step[ 2]; + output[3] = step[ 0] - step[ 3]; + + temp1 = step[ 4] * C14; + temp2 = step[ 7] * C2; + output[4] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = step[ 4] * C2; + temp2 = step[ 7] * C14; + output[7] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = step[ 5] * C10; + temp2 = step[ 6] * C6; + output[5] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = step[ 5] * C6; + temp2 = step[ 6] * C10; + output[6] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + output[8] = step[ 8] + step[11]; + output[9] = step[ 9] + step[10]; + output[10] = step[ 9] - step[10]; + output[11] = step[ 8] - step[11]; + output[12] = step[12] + step[15]; + output[13] = step[13] + step[14]; + output[14] = step[13] - step[14]; + output[15] = step[12] - step[15]; + + // output 4 + step[ 0] = output[0] + output[7]; + step[ 1] = output[1] + output[6]; + step[ 2] = output[2] + output[5]; + step[ 3] = output[3] + output[4]; + step[ 4] = output[3] - output[4]; + step[ 5] = output[2] - output[5]; + step[ 6] = output[1] - output[6]; + step[ 7] = output[0] - output[7]; + + temp1 = output[8] * C7; + temp2 = output[15] * C9; + step[ 8] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[9] * C11; + temp2 = output[14] * C5; + step[ 9] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[10] * C3; + temp2 = output[13] * C13; + step[10] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[11] * C15; + temp2 = output[12] * C1; + step[11] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[11] * C1; + temp2 = output[12] * C15; + step[12] = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[10] * C13; + temp2 = output[13] * C3; + step[13] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[9] * C5; + temp2 = output[14] * C11; + step[14] = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[8] * C9; + temp2 = output[15] * C7; + step[15] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + // step 5 + output[0] = (step[0] + step[15] + last_rounding) >> last_shift_bits; + output[1] = (step[1] + step[14] + last_rounding) >> last_shift_bits; + output[2] = (step[2] + step[13] + last_rounding) >> last_shift_bits; + output[3] = (step[3] + step[12] + last_rounding) >> last_shift_bits; + output[4] = (step[4] + step[11] + last_rounding) >> last_shift_bits; + output[5] = (step[5] + step[10] + last_rounding) >> last_shift_bits; + output[6] = (step[6] + step[ 9] + last_rounding) >> last_shift_bits; + output[7] = (step[7] + step[ 8] + last_rounding) >> last_shift_bits; + + output[15] = (step[0] - step[15] + last_rounding) >> last_shift_bits; + output[14] = (step[1] - step[14] + last_rounding) >> last_shift_bits; + output[13] = (step[2] - step[13] + last_rounding) >> last_shift_bits; + output[12] = (step[3] - step[12] + last_rounding) >> last_shift_bits; + output[11] = (step[4] - step[11] + last_rounding) >> last_shift_bits; + output[10] = (step[5] - step[10] + last_rounding) >> last_shift_bits; + output[9] = (step[6] - step[ 9] + last_rounding) >> last_shift_bits; + output[8] = (step[7] - step[ 8] + last_rounding) >> last_shift_bits; +} + +void vp9_short_idct16x16_c(int16_t *input, int16_t *output, int pitch) { + int16_t out[16 * 16]; + int16_t *outptr = &out[0]; + const int short_pitch = pitch >> 1; + int i, j; + int16_t temp_in[16], temp_out[16]; + + // First transform rows + for (i = 0; i < 16; ++i) { + butterfly_16x16_idct_1d(input, outptr, 0); + input += short_pitch; + outptr += 16; + } + + // Then transform columns + for (i = 0; i < 16; ++i) { + for (j = 0; j < 16; ++j) + temp_in[j] = out[j * 16 + i]; + butterfly_16x16_idct_1d(temp_in, temp_out, 3); + for (j = 0; j < 16; ++j) + output[j * 16 + i] = temp_out[j]; + } +} + +/* The following function is called when we know the maximum number of non-zero + * dct coefficients is less or equal 10. + */ +static void butterfly_16x16_idct10_1d(int16_t input[16], int16_t output[16], + int last_shift_bits) { + int16_t step[16] = {0}; + int intermediate[16] = {0}; + int temp1, temp2; + int last_rounding = 0; + + if (last_shift_bits > 0) + last_rounding = 1 << (last_shift_bits - 1); + + // step 1 and 2 + step[ 0] = (input[0] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[ 1] = (input[0] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + + temp1 = (2 * (input[2] * C8) + RIGHT_ROUNDING) >> RIGHT_SHIFT; + step[ 4] = (temp1 + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[ 5] = (temp1 + INITIAL_ROUNDING) >> INITIAL_SHIFT; + + // for odd input + temp1 = (input[3] * C12 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + temp1 *= C8; + intermediate[ 8] = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = (-input[3] * C4 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + temp1 *= C8; + intermediate[ 9] = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + step[ 8] = (intermediate[ 8] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[ 9] = (intermediate[ 9] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[10] = (-input[1] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[11] = (input[1] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[12] = (input[1] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[13] = (input[1] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[14] = (intermediate[ 8] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + step[15] = (intermediate[ 9] + INITIAL_ROUNDING) >> INITIAL_SHIFT; + + // step 3 + output[0] = step[ 0]; + output[1] = step[ 1]; + output[2] = step[ 1]; + output[3] = step[ 0]; + + temp1 = step[ 4] * C14; + output[4] = (temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = step[ 4] * C2; + output[7] = (temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = step[ 5] * C10; + output[5] = (temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = step[ 5] * C6; + output[6] = (temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + output[8] = step[ 8] + step[11]; + output[9] = step[ 9] + step[10]; + output[10] = step[ 9] - step[10]; + output[11] = step[ 8] - step[11]; + output[12] = step[12] + step[15]; + output[13] = step[13] + step[14]; + output[14] = step[13] - step[14]; + output[15] = step[12] - step[15]; + + // output 4 + step[ 0] = output[0] + output[7]; + step[ 1] = output[1] + output[6]; + step[ 2] = output[2] + output[5]; + step[ 3] = output[3] + output[4]; + step[ 4] = output[3] - output[4]; + step[ 5] = output[2] - output[5]; + step[ 6] = output[1] - output[6]; + step[ 7] = output[0] - output[7]; + + temp1 = output[8] * C7; + temp2 = output[15] * C9; + step[ 8] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[9] * C11; + temp2 = output[14] * C5; + step[ 9] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[10] * C3; + temp2 = output[13] * C13; + step[10] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[11] * C15; + temp2 = output[12] * C1; + step[11] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[11] * C1; + temp2 = output[12] * C15; + step[12] = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[10] * C13; + temp2 = output[13] * C3; + step[13] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[9] * C5; + temp2 = output[14] * C11; + step[14] = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + temp1 = output[8] * C9; + temp2 = output[15] * C7; + step[15] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT; + + // step 5 + output[0] = (step[0] + step[15] + last_rounding) >> last_shift_bits; + output[1] = (step[1] + step[14] + last_rounding) >> last_shift_bits; + output[2] = (step[2] + step[13] + last_rounding) >> last_shift_bits; + output[3] = (step[3] + step[12] + last_rounding) >> last_shift_bits; + output[4] = (step[4] + step[11] + last_rounding) >> last_shift_bits; + output[5] = (step[5] + step[10] + last_rounding) >> last_shift_bits; + output[6] = (step[6] + step[ 9] + last_rounding) >> last_shift_bits; + output[7] = (step[7] + step[ 8] + last_rounding) >> last_shift_bits; + + output[15] = (step[0] - step[15] + last_rounding) >> last_shift_bits; + output[14] = (step[1] - step[14] + last_rounding) >> last_shift_bits; + output[13] = (step[2] - step[13] + last_rounding) >> last_shift_bits; + output[12] = (step[3] - step[12] + last_rounding) >> last_shift_bits; + output[11] = (step[4] - step[11] + last_rounding) >> last_shift_bits; + output[10] = (step[5] - step[10] + last_rounding) >> last_shift_bits; + output[9] = (step[6] - step[ 9] + last_rounding) >> last_shift_bits; + output[8] = (step[7] - step[ 8] + last_rounding) >> last_shift_bits; +} + +void vp9_short_idct10_16x16_c(int16_t *input, int16_t *output, int pitch) { + int16_t out[16 * 16]; + int16_t *outptr = &out[0]; + const int short_pitch = pitch >> 1; + int i, j; + int16_t temp_in[16], temp_out[16]; + + /* First transform rows. Since all non-zero dct coefficients are in + * upper-left 4x4 area, we only need to calculate first 4 rows here. + */ + vpx_memset(out, 0, sizeof(out)); + for (i = 0; i < 4; ++i) { + butterfly_16x16_idct10_1d(input, outptr, 0); + input += short_pitch; + outptr += 16; + } + + // Then transform columns + for (i = 0; i < 16; ++i) { + for (j = 0; j < 16; ++j) + temp_in[j] = out[j*16 + i]; + butterfly_16x16_idct10_1d(temp_in, temp_out, 3); + for (j = 0; j < 16; ++j) + output[j*16 + i] = temp_out[j]; + } +} +#undef INITIAL_SHIFT +#undef INITIAL_ROUNDING +#undef RIGHT_SHIFT +#undef RIGHT_ROUNDING +#endif |