## ffmpeg / libavcodec / armv4l / mpegvideo_armv5te.c @ 782fc0c3

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1 | f57c7ad2 | Guillaume Poirier | ```
/*
``` |
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2 | ```
* Optimization of some functions from mpegvideo.c for armv5te
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3 | ```
* Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
``` |
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4 | ```
*
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5 | ```
* This file is part of FFmpeg.
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6 | ```
*
``` |
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7 | ```
* FFmpeg is free software; you can redistribute it and/or
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8 | ```
* modify it under the terms of the GNU Lesser General Public
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9 | ```
* License as published by the Free Software Foundation; either
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10 | ```
* version 2.1 of the License, or (at your option) any later version.
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11 | ```
*
``` |
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12 | ```
* FFmpeg is distributed in the hope that it will be useful,
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13 | ```
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | ```
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 | ```
* Lesser General Public License for more details.
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16 | ```
*
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17 | ```
* You should have received a copy of the GNU Lesser General Public
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18 | ```
* License along with FFmpeg; if not, write to the Free Software
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19 | ```
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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20 | ```
*/
``` |
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21 | |||

22 | 245976da | Diego Biurrun | #include "libavcodec/avcodec.h" |

23 | #include "libavcodec/dsputil.h" |
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24 | #include "libavcodec/mpegvideo.h" |
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25 | f57c7ad2 | Guillaume Poirier | |

26 | |||

27 | ```
#ifdef ENABLE_ARM_TESTS
``` |
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28 | ```
/**
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29 | ```
* h263 dequantizer supplementary function, it is performance critical and needs to
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30 | ```
* have optimized implementations for each architecture. Is also used as a reference
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31 | ```
* implementation in regression tests
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32 | ```
*/
``` |
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33 | static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count) |
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34 | { |
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35 | ```
int i, level;
``` |
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36 | for (i = 0; i < count; i++) { |
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37 | level = block[i]; |
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38 | ```
if (level) {
``` |
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39 | if (level < 0) { |
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40 | level = level * qmul - qadd; |
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41 | ```
} else {
``` |
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42 | level = level * qmul + qadd; |
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43 | } |
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44 | block[i] = level; |
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45 | } |
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46 | } |
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47 | } |
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48 | ```
#endif
``` |
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49 | |||

50 | ```
/* GCC 3.1 or higher is required to support symbolic names in assembly code */
``` |
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51 | #if (__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)) |
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52 | |||

53 | ```
/**
``` |
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54 | ```
* Special optimized version of dct_unquantize_h263_helper_c, it requires the block
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55 | ```
* to be at least 8 bytes aligned, and may process more elements than requested.
``` |
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56 | ```
* But it is guaranteed to never process more than 64 elements provided that
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57 | ```
* xxcount argument is <= 64, so it is safe. This macro is optimized for a common
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58 | ```
* distribution of values for nCoeffs (they are mostly multiple of 8 plus one or
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59 | ```
* two extra elements). So this macro processes data as 8 elements per loop iteration
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60 | ```
* and contains optional 2 elements processing in the end.
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61 | ```
*
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62 | ```
* Inner loop should take 6 cycles per element on arm926ej-s (Nokia 770)
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63 | ```
*/
``` |
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64 | ```
#define dct_unquantize_h263_special_helper_armv5te(xxblock, xxqmul, xxqadd, xxcount) \
``` |
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65 | ({ DCTELEM *xblock = xxblock; \ |
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66 | ```
int xqmul = xxqmul, xqadd = xxqadd, xcount = xxcount, xtmp; \
``` |
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67 | ```
int xdata1, xdata2; \
``` |
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68 | be449fca | Diego Pettenò | ```
__asm__ volatile( \
``` |

69 | 204ce38f | Måns Rullgård | ```
"subs %[count], %[count], #2 \n\t" \
``` |

70 | f57c7ad2 | Guillaume Poirier | ```
"ble 2f \n\t" \
``` |

71 | ```
"ldrd r4, [%[block], #0] \n\t" \
``` |
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72 | ```
"1: \n\t" \
``` |
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73 | ```
"ldrd r6, [%[block], #8] \n\t" \
``` |
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74 | \ |
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75 | ```
"rsbs %[data1], %[zero], r4, asr #16 \n\t" \
``` |
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76 | ```
"addgt %[data1], %[qadd], #0 \n\t" \
``` |
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77 | ```
"rsblt %[data1], %[qadd], #0 \n\t" \
``` |
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78 | ```
"smlatbne %[data1], r4, %[qmul], %[data1] \n\t" \
``` |
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79 | \ |
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80 | ```
"rsbs %[data2], %[zero], r5, asr #16 \n\t" \
``` |
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81 | ```
"addgt %[data2], %[qadd], #0 \n\t" \
``` |
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82 | ```
"rsblt %[data2], %[qadd], #0 \n\t" \
``` |
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83 | ```
"smlatbne %[data2], r5, %[qmul], %[data2] \n\t" \
``` |
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84 | \ |
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85 | ```
"rsbs %[tmp], %[zero], r4, asl #16 \n\t" \
``` |
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86 | ```
"addgt %[tmp], %[qadd], #0 \n\t" \
``` |
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87 | ```
"rsblt %[tmp], %[qadd], #0 \n\t" \
``` |
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88 | ```
"smlabbne r4, r4, %[qmul], %[tmp] \n\t" \
``` |
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89 | \ |
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90 | ```
"rsbs %[tmp], %[zero], r5, asl #16 \n\t" \
``` |
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91 | ```
"addgt %[tmp], %[qadd], #0 \n\t" \
``` |
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92 | ```
"rsblt %[tmp], %[qadd], #0 \n\t" \
``` |
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93 | ```
"smlabbne r5, r5, %[qmul], %[tmp] \n\t" \
``` |
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94 | \ |
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95 | ```
"strh r4, [%[block]], #2 \n\t" \
``` |
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96 | ```
"strh %[data1], [%[block]], #2 \n\t" \
``` |
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97 | ```
"strh r5, [%[block]], #2 \n\t" \
``` |
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98 | ```
"strh %[data2], [%[block]], #2 \n\t" \
``` |
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99 | \ |
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100 | ```
"rsbs %[data1], %[zero], r6, asr #16 \n\t" \
``` |
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101 | ```
"addgt %[data1], %[qadd], #0 \n\t" \
``` |
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102 | ```
"rsblt %[data1], %[qadd], #0 \n\t" \
``` |
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103 | ```
"smlatbne %[data1], r6, %[qmul], %[data1] \n\t" \
``` |
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104 | \ |
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105 | ```
"rsbs %[data2], %[zero], r7, asr #16 \n\t" \
``` |
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106 | ```
"addgt %[data2], %[qadd], #0 \n\t" \
``` |
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107 | ```
"rsblt %[data2], %[qadd], #0 \n\t" \
``` |
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108 | ```
"smlatbne %[data2], r7, %[qmul], %[data2] \n\t" \
``` |
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109 | \ |
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110 | ```
"rsbs %[tmp], %[zero], r6, asl #16 \n\t" \
``` |
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111 | ```
"addgt %[tmp], %[qadd], #0 \n\t" \
``` |
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112 | ```
"rsblt %[tmp], %[qadd], #0 \n\t" \
``` |
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113 | ```
"smlabbne r6, r6, %[qmul], %[tmp] \n\t" \
``` |
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114 | \ |
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115 | ```
"rsbs %[tmp], %[zero], r7, asl #16 \n\t" \
``` |
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116 | ```
"addgt %[tmp], %[qadd], #0 \n\t" \
``` |
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117 | ```
"rsblt %[tmp], %[qadd], #0 \n\t" \
``` |
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118 | ```
"smlabbne r7, r7, %[qmul], %[tmp] \n\t" \
``` |
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119 | \ |
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120 | ```
"strh r6, [%[block]], #2 \n\t" \
``` |
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121 | ```
"strh %[data1], [%[block]], #2 \n\t" \
``` |
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122 | ```
"strh r7, [%[block]], #2 \n\t" \
``` |
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123 | ```
"strh %[data2], [%[block]], #2 \n\t" \
``` |
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124 | \ |
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125 | 204ce38f | Måns Rullgård | ```
"subs %[count], %[count], #8 \n\t" \
``` |

126 | f57c7ad2 | Guillaume Poirier | "ldrgtd r4, [%[block], #0] \n\t" /* load data early to avoid load/use pipeline stall */ \ |

127 | ```
"bgt 1b \n\t" \
``` |
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128 | \ |
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129 | 204ce38f | Måns Rullgård | ```
"adds %[count], %[count], #2 \n\t" \
``` |

130 | f57c7ad2 | Guillaume Poirier | ```
"ble 3f \n\t" \
``` |

131 | ```
"2: \n\t" \
``` |
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132 | ```
"ldrsh %[data1], [%[block], #0] \n\t" \
``` |
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133 | ```
"ldrsh %[data2], [%[block], #2] \n\t" \
``` |
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134 | ```
"mov %[tmp], %[qadd] \n\t" \
``` |
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135 | ```
"cmp %[data1], #0 \n\t" \
``` |
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136 | ```
"rsblt %[tmp], %[qadd], #0 \n\t" \
``` |
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137 | ```
"smlabbne %[data1], %[data1], %[qmul], %[tmp] \n\t" \
``` |
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138 | ```
"mov %[tmp], %[qadd] \n\t" \
``` |
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139 | ```
"cmp %[data2], #0 \n\t" \
``` |
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140 | ```
"rsblt %[tmp], %[qadd], #0 \n\t" \
``` |
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141 | ```
"smlabbne %[data2], %[data2], %[qmul], %[tmp] \n\t" \
``` |
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142 | ```
"strh %[data1], [%[block]], #2 \n\t" \
``` |
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143 | ```
"strh %[data2], [%[block]], #2 \n\t" \
``` |
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144 | ```
"3: \n\t" \
``` |
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145 | : [block] "+&r" (xblock), [count] "+&r" (xcount), [tmp] "=&r" (xtmp), \ |
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146 | [data1] "=&r" (xdata1), [data2] "=&r" (xdata2) \ |
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147 | : [qmul] "r" (xqmul), [qadd] "r" (xqadd), [zero] "r" (0) \ |
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148 | : "r4", "r5", "r6", "r7", "cc", "memory" \ |
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149 | ); \ |
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150 | }) |
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151 | |||

152 | static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s, |
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153 | DCTELEM *block, int n, int qscale) |
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154 | { |
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155 | 83bc90dc | Diego Biurrun | ```
int level, qmul, qadd;
``` |

156 | f57c7ad2 | Guillaume Poirier | ```
int nCoeffs;
``` |

157 | |||

158 | ```
assert(s->block_last_index[n]>=0);
``` |
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159 | |||

160 | ```
qmul = qscale << 1;
``` |
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161 | |||

162 | ```
if (!s->h263_aic) {
``` |
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163 | if (n < 4) |
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164 | ```
level = block[0] * s->y_dc_scale;
``` |
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165 | ```
else
``` |
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166 | ```
level = block[0] * s->c_dc_scale;
``` |
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167 | qadd = (qscale - 1) | 1; |
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168 | ```
}else{
``` |
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169 | ```
qadd = 0;
``` |
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170 | ```
level = block[0];
``` |
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171 | } |
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172 | ```
if(s->ac_pred)
``` |
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173 | ```
nCoeffs=63;
``` |
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174 | ```
else
``` |
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175 | nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ]; |
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176 | |||

177 | ```
dct_unquantize_h263_special_helper_armv5te(block, qmul, qadd, nCoeffs + 1);
``` |
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178 | ```
block[0] = level;
``` |
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179 | } |
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180 | |||

181 | static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s, |
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182 | DCTELEM *block, int n, int qscale) |
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183 | { |
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184 | 83bc90dc | Diego Biurrun | ```
int qmul, qadd;
``` |

185 | f57c7ad2 | Guillaume Poirier | ```
int nCoeffs;
``` |

186 | |||

187 | ```
assert(s->block_last_index[n]>=0);
``` |
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188 | |||

189 | qadd = (qscale - 1) | 1; |
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190 | ```
qmul = qscale << 1;
``` |
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191 | |||

192 | nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ]; |
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193 | |||

194 | ```
dct_unquantize_h263_special_helper_armv5te(block, qmul, qadd, nCoeffs + 1);
``` |
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195 | } |
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196 | |||

197 | ```
#define HAVE_DCT_UNQUANTIZE_H263_ARMV5TE_OPTIMIZED
``` |
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198 | |||

199 | ```
#endif
``` |
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200 | |||

201 | ```
void MPV_common_init_armv5te(MpegEncContext *s)
``` |
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202 | { |
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203 | ```
#ifdef HAVE_DCT_UNQUANTIZE_H263_ARMV5TE_OPTIMIZED
``` |
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204 | s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te; |
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205 | s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te; |
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206 | ```
#endif
``` |
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207 | } |