FFmpeg
h264dsp.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * H.264 DSP functions.
24  * @author Michael Niedermayer <michaelni@gmx.at>
25  */
26 
27 #ifndef AVCODEC_H264DSP_H
28 #define AVCODEC_H264DSP_H
29 
30 #include <stdint.h>
31 #include <stddef.h>
32 
33 typedef void (*h264_weight_func)(uint8_t *block, ptrdiff_t stride, int height,
34  int log2_denom, int weight, int offset);
35 typedef void (*h264_biweight_func)(uint8_t *dst, uint8_t *src,
36  ptrdiff_t stride, int height, int log2_denom,
37  int weightd, int weights, int offset);
38 
39 /**
40  * Context for storing H.264 DSP functions
41  */
42 typedef struct H264DSPContext {
43  /* weighted MC */
44  h264_weight_func weight_h264_pixels_tab[4];
45  h264_biweight_func biweight_h264_pixels_tab[4];
46 
47  /* loop filter */
48  void (*h264_v_loop_filter_luma)(uint8_t *pix /*align 16*/, ptrdiff_t stride,
49  int alpha, int beta, int8_t *tc0);
50  void (*h264_h_loop_filter_luma)(uint8_t *pix /*align 4 */, ptrdiff_t stride,
51  int alpha, int beta, int8_t *tc0);
52  void (*h264_h_loop_filter_luma_mbaff)(uint8_t *pix /*align 16*/, ptrdiff_t stride,
53  int alpha, int beta, int8_t *tc0);
54  /* v/h_loop_filter_luma_intra: align 16 */
55  void (*h264_v_loop_filter_luma_intra)(uint8_t *pix, ptrdiff_t stride,
56  int alpha, int beta);
57  void (*h264_h_loop_filter_luma_intra)(uint8_t *pix, ptrdiff_t stride,
58  int alpha, int beta);
59  void (*h264_h_loop_filter_luma_mbaff_intra)(uint8_t *pix /*align 16*/,
60  ptrdiff_t stride, int alpha, int beta);
61  void (*h264_v_loop_filter_chroma)(uint8_t *pix /*align 8*/, ptrdiff_t stride,
62  int alpha, int beta, int8_t *tc0);
63  void (*h264_h_loop_filter_chroma)(uint8_t *pix /*align 4*/, ptrdiff_t stride,
64  int alpha, int beta, int8_t *tc0);
65  void (*h264_h_loop_filter_chroma_mbaff)(uint8_t *pix /*align 8*/,
66  ptrdiff_t stride, int alpha, int beta,
67  int8_t *tc0);
68  void (*h264_v_loop_filter_chroma_intra)(uint8_t *pix /*align 8*/,
69  ptrdiff_t stride, int alpha, int beta);
70  void (*h264_h_loop_filter_chroma_intra)(uint8_t *pix /*align 8*/,
71  ptrdiff_t stride, int alpha, int beta);
72  void (*h264_h_loop_filter_chroma_mbaff_intra)(uint8_t *pix /*align 8*/,
73  ptrdiff_t stride, int alpha, int beta);
74  // h264_loop_filter_strength: simd only. the C version is inlined in h264_loopfilter.c
75  void (*h264_loop_filter_strength)(int16_t bS[2][4][4], uint8_t nnz[40],
76  int8_t ref[2][40], int16_t mv[2][40][2],
77  int bidir, int edges, int step,
78  int mask_mv0, int mask_mv1, int field);
79 
80  /* IDCT */
81  void (*h264_idct_add)(uint8_t *dst /*align 4*/,
82  int16_t *block /*align 16*/, int stride);
83  void (*h264_idct8_add)(uint8_t *dst /*align 8*/,
84  int16_t *block /*align 16*/, int stride);
85  void (*h264_idct_dc_add)(uint8_t *dst /*align 4*/,
86  int16_t *block /*align 16*/, int stride);
87  void (*h264_idct8_dc_add)(uint8_t *dst /*align 8*/,
88  int16_t *block /*align 16*/, int stride);
89 
90  void (*h264_idct_add16)(uint8_t *dst /*align 16*/, const int *blockoffset,
91  int16_t *block /*align 16*/, int stride,
92  const uint8_t nnzc[5 * 8]);
93  void (*h264_idct8_add4)(uint8_t *dst /*align 16*/, const int *blockoffset,
94  int16_t *block /*align 16*/, int stride,
95  const uint8_t nnzc[5 * 8]);
96  void (*h264_idct_add8)(uint8_t **dst /*align 16*/, const int *blockoffset,
97  int16_t *block /*align 16*/, int stride,
98  const uint8_t nnzc[15 * 8]);
99  void (*h264_idct_add16intra)(uint8_t *dst /*align 16*/, const int *blockoffset,
100  int16_t *block /*align 16*/,
101  int stride, const uint8_t nnzc[5 * 8]);
102  void (*h264_luma_dc_dequant_idct)(int16_t *output,
103  int16_t *input /*align 16*/, int qmul);
104  void (*h264_chroma_dc_dequant_idct)(int16_t *block, int qmul);
105 
106  /* bypass-transform */
107  void (*h264_add_pixels8_clear)(uint8_t *dst, int16_t *block, int stride);
108  void (*h264_add_pixels4_clear)(uint8_t *dst, int16_t *block, int stride);
109 
110  /**
111  * Search buf from the start for up to size bytes. Return the index
112  * of a zero byte, or >= size if not found. Ideally, use lookahead
113  * to filter out any zero bytes that are known to not be followed by
114  * one or more further zero bytes and a one byte. Better still, filter
115  * out any bytes that form the trailing_zero_8bits syntax element too.
116  */
117  int (*startcode_find_candidate)(const uint8_t *buf, int size);
118 } H264DSPContext;
119 
120 void ff_h264dsp_init(H264DSPContext *c, const int bit_depth,
121  const int chroma_format_idc);
122 void ff_h264dsp_init_aarch64(H264DSPContext *c, const int bit_depth,
123  const int chroma_format_idc);
124 void ff_h264dsp_init_arm(H264DSPContext *c, const int bit_depth,
125  const int chroma_format_idc);
126 void ff_h264dsp_init_ppc(H264DSPContext *c, const int bit_depth,
127  const int chroma_format_idc);
128 void ff_h264dsp_init_x86(H264DSPContext *c, const int bit_depth,
129  const int chroma_format_idc);
130 void ff_h264dsp_init_mips(H264DSPContext *c, const int bit_depth,
131  const int chroma_format_idc);
132 void ff_h264dsp_init_loongarch(H264DSPContext *c, const int bit_depth,
133  const int chroma_format_idc);
134 
135 #endif /* AVCODEC_H264DSP_H */
bit_depth
static void bit_depth(AudioStatsContext *s, uint64_t mask, uint64_t imask, AVRational *depth)
Definition: af_astats.c:227
H264DSPContext::h264_idct_add8
void(* h264_idct_add8)(uint8_t **dst, const int *blockoffset, int16_t *block, int stride, const uint8_t nnzc[15 *8])
Definition: h264dsp.h:96
h264_biweight_func
void(* h264_biweight_func)(uint8_t *dst, uint8_t *src, ptrdiff_t stride, int height, int log2_denom, int weightd, int weights, int offset)
Definition: h264dsp.h:35
output
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
Definition: filter_design.txt:225
mv
static const int8_t mv[256][2]
Definition: 4xm.c:80
ff_h264dsp_init_arm
void ff_h264dsp_init_arm(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
Definition: h264dsp_init_arm.c:109
step
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about which is also called distortion Distortion can be quantified by almost any quality measurement one chooses the sum of squared differences is used but more complex methods that consider psychovisual effects can be used as well It makes no difference in this discussion First step
Definition: rate_distortion.txt:58
ff_h264dsp_init_mips
void ff_h264dsp_init_mips(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
Definition: h264dsp_init_mips.c:26
H264DSPContext::h264_chroma_dc_dequant_idct
void(* h264_chroma_dc_dequant_idct)(int16_t *block, int qmul)
Definition: h264dsp.h:104
H264DSPContext::h264_add_pixels8_clear
void(* h264_add_pixels8_clear)(uint8_t *dst, int16_t *block, int stride)
Definition: h264dsp.h:107
ff_h264dsp_init_loongarch
void ff_h264dsp_init_loongarch(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
Definition: h264dsp_init_loongarch.c:26
H264DSPContext::h264_idct_add16
void(* h264_idct_add16)(uint8_t *dst, const int *blockoffset, int16_t *block, int stride, const uint8_t nnzc[5 *8])
Definition: h264dsp.h:90
ff_h264dsp_init
void ff_h264dsp_init(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
Definition: h264dsp.c:66
H264DSPContext::h264_v_loop_filter_chroma
void(* h264_v_loop_filter_chroma)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta, int8_t *tc0)
Definition: h264dsp.h:61
H264DSPContext::biweight_h264_pixels_tab
h264_biweight_func biweight_h264_pixels_tab[4]
Definition: h264dsp.h:45
field
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this field
Definition: writing_filters.txt:78
ff_h264dsp_init_aarch64
void ff_h264dsp_init_aarch64(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
Definition: h264dsp_init_aarch64.c:109
H264DSPContext::h264_h_loop_filter_chroma_mbaff
void(* h264_h_loop_filter_chroma_mbaff)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta, int8_t *tc0)
Definition: h264dsp.h:65
H264DSPContext::startcode_find_candidate
int(* startcode_find_candidate)(const uint8_t *buf, int size)
Search buf from the start for up to size bytes.
Definition: h264dsp.h:117
H264DSPContext::h264_v_loop_filter_chroma_intra
void(* h264_v_loop_filter_chroma_intra)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta)
Definition: h264dsp.h:68
H264DSPContext::h264_idct8_dc_add
void(* h264_idct8_dc_add)(uint8_t *dst, int16_t *block, int stride)
Definition: h264dsp.h:87
H264DSPContext::h264_h_loop_filter_luma
void(* h264_h_loop_filter_luma)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta, int8_t *tc0)
Definition: h264dsp.h:50
H264DSPContext::h264_h_loop_filter_chroma_mbaff_intra
void(* h264_h_loop_filter_chroma_mbaff_intra)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta)
Definition: h264dsp.h:72
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
weight
static int weight(int i, int blen, int offset)
Definition: diracdec.c:1562
H264DSPContext::h264_h_loop_filter_luma_intra
void(* h264_h_loop_filter_luma_intra)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta)
Definition: h264dsp.h:57
H264DSPContext
Context for storing H.264 DSP functions.
Definition: h264dsp.h:42
H264DSPContext::h264_h_loop_filter_luma_mbaff
void(* h264_h_loop_filter_luma_mbaff)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta, int8_t *tc0)
Definition: h264dsp.h:52
h264_weight_func
void(* h264_weight_func)(uint8_t *block, ptrdiff_t stride, int height, int log2_denom, int weight, int offset)
Definition: h264dsp.h:33
H264DSPContext::h264_loop_filter_strength
void(* h264_loop_filter_strength)(int16_t bS[2][4][4], uint8_t nnz[40], int8_t ref[2][40], int16_t mv[2][40][2], int bidir, int edges, int step, int mask_mv0, int mask_mv1, int field)
Definition: h264dsp.h:75
size
int size
Definition: twinvq_data.h:10344
H264DSPContext::weight_h264_pixels_tab
h264_weight_func weight_h264_pixels_tab[4]
Definition: h264dsp.h:44
H264DSPContext::h264_h_loop_filter_chroma_intra
void(* h264_h_loop_filter_chroma_intra)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta)
Definition: h264dsp.h:70
height
#define height
ff_h264dsp_init_ppc
void ff_h264dsp_init_ppc(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
Definition: h264dsp.c:789
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
input
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some input
Definition: filter_design.txt:172
weights
static const int weights[]
Definition: hevc_pel.c:32
H264DSPContext::h264_idct8_add
void(* h264_idct8_add)(uint8_t *dst, int16_t *block, int stride)
Definition: h264dsp.h:83
H264DSPContext::h264_v_loop_filter_luma_intra
void(* h264_v_loop_filter_luma_intra)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta)
Definition: h264dsp.h:55
H264DSPContext::h264_h_loop_filter_chroma
void(* h264_h_loop_filter_chroma)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta, int8_t *tc0)
Definition: h264dsp.h:63
stride
#define stride
Definition: h264pred_template.c:537
ff_h264dsp_init_x86
void ff_h264dsp_init_x86(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
Definition: h264dsp_init.c:190
H264DSPContext::h264_idct8_add4
void(* h264_idct8_add4)(uint8_t *dst, const int *blockoffset, int16_t *block, int stride, const uint8_t nnzc[5 *8])
Definition: h264dsp.h:93
H264DSPContext::h264_idct_dc_add
void(* h264_idct_dc_add)(uint8_t *dst, int16_t *block, int stride)
Definition: h264dsp.h:85
H264DSPContext::h264_luma_dc_dequant_idct
void(* h264_luma_dc_dequant_idct)(int16_t *output, int16_t *input, int qmul)
Definition: h264dsp.h:102
ref
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:112
H264DSPContext::h264_add_pixels4_clear
void(* h264_add_pixels4_clear)(uint8_t *dst, int16_t *block, int stride)
Definition: h264dsp.h:108
H264DSPContext::h264_h_loop_filter_luma_mbaff_intra
void(* h264_h_loop_filter_luma_mbaff_intra)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta)
Definition: h264dsp.h:59
H264DSPContext::h264_idct_add16intra
void(* h264_idct_add16intra)(uint8_t *dst, const int *blockoffset, int16_t *block, int stride, const uint8_t nnzc[5 *8])
Definition: h264dsp.h:99
H264DSPContext::h264_v_loop_filter_luma
void(* h264_v_loop_filter_luma)(uint8_t *pix, ptrdiff_t stride, int alpha, int beta, int8_t *tc0)
Definition: h264dsp.h:48
alpha
static const int16_t alpha[]
Definition: ilbcdata.h:55
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
int
int
Definition: ffmpeg_filter.c:156
H264DSPContext::h264_idct_add
void(* h264_idct_add)(uint8_t *dst, int16_t *block, int stride)
Definition: h264dsp.h:81
Generated on Tue Feb 28 2023 21:33:18 for FFmpeg by   doxygen 1.8.17