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mpegvideo.c
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1 /*
2  * Copyright (c) 2010 Mans Rullgard
3  * Copyright (c) 2014 James Yu <james.yu@linaro.org>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <arm_neon.h>
23 
24 #include "config.h"
25 
26 #include "libavutil/cpu.h"
27 #if ARCH_AARCH64
28 # include "libavutil/aarch64/cpu.h"
29 #elif ARCH_ARM
30 # include "libavutil/arm/cpu.h"
31 #endif
32 
33 #include "libavcodec/mpegvideo.h"
34 
35 static void inline ff_dct_unquantize_h263_neon(int qscale, int qadd, int nCoeffs,
36  int16_t *block)
37 {
38  int16x8_t q0s16, q2s16, q3s16, q8s16, q10s16, q11s16, q13s16;
39  int16x8_t q14s16, q15s16, qzs16;
40  int16x4_t d0s16, d2s16, d3s16, dzs16;
41  uint16x8_t q1u16, q9u16;
42  uint16x4_t d1u16;
43 
44  dzs16 = vdup_n_s16(0);
45  qzs16 = vdupq_n_s16(0);
46 
47  q15s16 = vdupq_n_s16(qscale << 1);
48  q14s16 = vdupq_n_s16(qadd);
49  q13s16 = vnegq_s16(q14s16);
50 
51  if (nCoeffs > 4) {
52  for (; nCoeffs > 8; nCoeffs -= 16, block += 16) {
53  q0s16 = vld1q_s16(block);
54  q3s16 = vreinterpretq_s16_u16(vcltq_s16(q0s16, qzs16));
55  q8s16 = vld1q_s16(block + 8);
56  q1u16 = vceqq_s16(q0s16, qzs16);
57  q2s16 = vmulq_s16(q0s16, q15s16);
58  q11s16 = vreinterpretq_s16_u16(vcltq_s16(q8s16, qzs16));
59  q10s16 = vmulq_s16(q8s16, q15s16);
60  q3s16 = vbslq_s16(vreinterpretq_u16_s16(q3s16), q13s16, q14s16);
61  q11s16 = vbslq_s16(vreinterpretq_u16_s16(q11s16), q13s16, q14s16);
62  q2s16 = vaddq_s16(q2s16, q3s16);
63  q9u16 = vceqq_s16(q8s16, qzs16);
64  q10s16 = vaddq_s16(q10s16, q11s16);
65  q0s16 = vbslq_s16(q1u16, q0s16, q2s16);
66  q8s16 = vbslq_s16(q9u16, q8s16, q10s16);
67  vst1q_s16(block, q0s16);
68  vst1q_s16(block + 8, q8s16);
69  }
70  }
71  if (nCoeffs <= 0)
72  return;
73 
74  d0s16 = vld1_s16(block);
75  d3s16 = vreinterpret_s16_u16(vclt_s16(d0s16, dzs16));
76  d1u16 = vceq_s16(d0s16, dzs16);
77  d2s16 = vmul_s16(d0s16, vget_high_s16(q15s16));
78  d3s16 = vbsl_s16(vreinterpret_u16_s16(d3s16),
79  vget_high_s16(q13s16), vget_high_s16(q14s16));
80  d2s16 = vadd_s16(d2s16, d3s16);
81  d0s16 = vbsl_s16(d1u16, d0s16, d2s16);
82  vst1_s16(block, d0s16);
83 }
84 
86  int n, int qscale)
87 {
88  int nCoeffs = s->inter_scantable.raster_end[s->block_last_index[n]];
89  int qadd = (qscale - 1) | 1;
90 
91  ff_dct_unquantize_h263_neon(qscale, qadd, nCoeffs + 1, block);
92 }
93 
95  int n, int qscale)
96 {
97  int qadd;
98  int nCoeffs, blk0;
99 
100  if (!s->h263_aic) {
101  if (n < 4)
102  block[0] *= s->y_dc_scale;
103  else
104  block[0] *= s->c_dc_scale;
105  qadd = (qscale - 1) | 1;
106  } else {
107  qadd = 0;
108  }
109 
110  if (s->ac_pred) {
111  nCoeffs = 63;
112  } else {
113  nCoeffs = s->inter_scantable.raster_end[s->block_last_index[n]];
114  if (nCoeffs <= 0)
115  return;
116  }
117 
118  blk0 = block[0];
119 
120  ff_dct_unquantize_h263_neon(qscale, qadd, nCoeffs + 1, block);
121 
122  block[0] = blk0;
123 }
124 
125 
127 {
128  int cpu_flags = av_get_cpu_flags();
129 
130  if (have_neon(cpu_flags)) {
133  }
134 }
const char * s
Definition: avisynth_c.h:768
av_cold void ff_mpv_common_init_neon(MpegEncContext *s)
Definition: mpegvideo.c:126
uint8_t raster_end[64]
Definition: idctdsp.h:34
mpegvideo header.
static atomic_int cpu_flags
Definition: cpu.c:50
int h263_aic
Advanced INTRA Coding (AIC)
Definition: mpegvideo.h:84
void(* dct_unquantize_h263_intra)(struct MpegEncContext *s, int16_t *block, int n, int qscale)
Definition: mpegvideo.h:511
void(* dct_unquantize_h263_inter)(struct MpegEncContext *s, int16_t *block, int n, int qscale)
Definition: mpegvideo.h:513
static int16_t block[64]
Definition: dct.c:115
#define av_cold
Definition: attributes.h:82
static void ff_dct_unquantize_h263_neon(int qscale, int qadd, int nCoeffs, int16_t *block)
Definition: mpegvideo.c:35
#define have_neon(flags)
Definition: cpu.h:27
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:83
int n
Definition: avisynth_c.h:684
static void dct_unquantize_h263_intra_neon(MpegEncContext *s, int16_t *block, int n, int qscale)
Definition: mpegvideo.c:94
static void dct_unquantize_h263_inter_neon(MpegEncContext *s, int16_t *block, int n, int qscale)
Definition: mpegvideo.c:85
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:92
#define blk0(i)
Definition: sha.c:53
MpegEncContext.
Definition: mpegvideo.h:78
ScanTable inter_scantable
if inter == intra then intra should be used to reduce the cache usage
Definition: mpegvideo.h:87