Make show_formats() print each bitstream filter on a separate line.
[libav.git] / libavutil / pixdesc.h
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9b61d838 1/*
e0cffbe7 2 * pixel format descriptor
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3 * Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
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
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22#ifndef AVUTIL_PIXDESC_H
23#define AVUTIL_PIXDESC_H
5499a313 24
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25#include <inttypes.h>
26
51135d1d 27#include "intreadwrite.h"
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28
29typedef struct AVComponentDescriptor{
30 uint16_t plane :2; ///< which of the 4 planes contains the component
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31
32 /**
33 * Number of elements between 2 horizontally consecutive pixels minus 1.
34 * Elements are bits for bitstream formats, bytes otherwise.
35 */
36 uint16_t step_minus1 :3;
37
38 /**
39 * Number of elements before the component of the first pixel plus 1.
40 * Elements are bits for bitstream formats, bytes otherwise.
41 */
42 uint16_t offset_plus1 :3;
78679783 43 uint16_t shift :3; ///< number of least significant bits that must be shifted away to get the value
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44 uint16_t depth_minus1 :4; ///< number of bits in the component minus 1
45}AVComponentDescriptor;
46
d3bcbf57 47/**
e0cffbe7 48 * Descriptor that unambiguously describes how the bits of a pixel are
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49 * stored in the up to 4 data planes of an image. It also stores the
50 * subsampling factors and number of components.
51 *
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52 * @note This is separate of the colorspace (RGB, YCbCr, YPbPr, JPEG-style YUV
53 * and all the YUV variants) AVPixFmtDescriptor just stores how values
54 * are stored not what these values represent.
d3bcbf57 55 */
9b61d838 56typedef struct AVPixFmtDescriptor{
1e896640 57 const char *name;
b8873c2a 58 uint8_t nb_components; ///< The number of components each pixel has, (1-4)
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59
60 /**
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61 * Amount to shift the luma width right to find the chroma width.
62 * For YV12 this is 1 for example.
63 * chroma_width = -((-luma_width) >> log2_chroma_w)
64 * The note above is needed to ensure rounding up.
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65 */
66 uint8_t log2_chroma_w; ///< chroma_width = -((-luma_width )>>log2_chroma_w)
67
68 /**
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69 * Amount to shift the luma height right to find the chroma height.
70 * For YV12 this is 1 for example.
71 * chroma_height= -((-luma_height) >> log2_chroma_h)
72 * The note above is needed to ensure rounding up.
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73 */
74 uint8_t log2_chroma_h;
75 uint8_t flags;
e0cffbe7 76 AVComponentDescriptor comp[4]; ///< parameters that describe how pixels are packed
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77}AVPixFmtDescriptor;
78
e0cffbe7 79#define PIX_FMT_BE 1 ///< big-endian
d3f76612 80#define PIX_FMT_PAL 2 ///< Pixel format has a palette in data[1], values are indexes in this palette.
e0cffbe7 81#define PIX_FMT_BITSTREAM 4 ///< All values of a component are bit-wise packed end to end.
6b27353c 82#define PIX_FMT_HWACCEL 8 ///< Pixel format is an HW accelerated format.
9b61d838 83
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84/**
85 * The array of all the pixel format descriptors.
86 */
87extern const AVPixFmtDescriptor av_pix_fmt_descriptors[];
9b61d838 88
9b34899e 89/**
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90 * Reads a line from an image, and writes to dst the values of the
91 * pixel format component c.
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92 *
93 * @param data the array containing the pointers to the planes of the image
94 * @param linesizes the array containing the linesizes of the image
95 * @param desc the pixel format descriptor for the image
96 * @param x the horizontal coordinate of the first pixel to read
97 * @param y the vertical coordinate of the first pixel to read
98 * @param w the width of the line to read, that is the number of
bf7e799c 99 * values to write to dst
0a47f60a 100 * @param read_pal_component if not zero and the format is a paletted
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101 * format writes to dst the values corresponding to the palette
102 * component c in data[1], rather than the palette indexes in
0a47f60a 103 * data[0]. The behavior is undefined if the format is not paletted.
9b34899e 104 */
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105static inline void read_line(uint16_t *dst, const uint8_t *data[4], const int linesize[4],
106 const AVPixFmtDescriptor *desc, int x, int y, int c, int w, int read_pal_component)
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107{
108 AVComponentDescriptor comp= desc->comp[c];
109 int plane= comp.plane;
110 int depth= comp.depth_minus1+1;
111 int mask = (1<<depth)-1;
112 int shift= comp.shift;
113 int step = comp.step_minus1+1;
114 int flags= desc->flags;
9b61d838 115
c95dd8d3 116 if (flags & PIX_FMT_BITSTREAM){
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117 int skip = x*step + comp.offset_plus1-1;
118 const uint8_t *p = data[plane] + y*linesize[plane] + (skip>>3);
119 int shift = 8 - depth - (skip&7);
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120
121 while(w--){
297b5a3f 122 int val = (*p >> shift) & mask;
0a47f60a 123 if(read_pal_component)
c95dd8d3 124 val= data[1][4*val + c];
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125 shift -= step;
126 p -= shift>>3;
127 shift &= 7;
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128 *dst++= val;
129 }
130 } else {
59b05350 131 const uint8_t *p = data[plane]+ y*linesize[plane] + x*step + comp.offset_plus1-1;
9b61d838 132
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133 while(w--){
134 int val;
135 if(flags & PIX_FMT_BE) val= AV_RB16(p);
136 else val= AV_RL16(p);
137 val = (val>>shift) & mask;
0a47f60a 138 if(read_pal_component)
59b05350 139 val= data[1][4*val + c];
9b61d838 140 p+= step;
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141 *dst++= val;
142 }
c95dd8d3 143 }
9b61d838 144}
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145
146/**
147 * Writes the values from src to the pixel format component c of an
148 * image line.
149 *
150 * @param src array containing the values to write
151 * @param data the array containing the pointers to the planes of the
152 * image to write into. It is supposed to be zeroed.
153 * @param linesizes the array containing the linesizes of the image
154 * @param desc the pixel format descriptor for the image
155 * @param x the horizontal coordinate of the first pixel to write
156 * @param y the vertical coordinate of the first pixel to write
157 * @param w the width of the line to write, that is the number of
158 * values to write to the image line
159 */
160static inline void write_line(const uint16_t *src, uint8_t *data[4], const int linesize[4],
161 const AVPixFmtDescriptor *desc, int x, int y, int c, int w)
162{
163 AVComponentDescriptor comp = desc->comp[c];
164 int plane = comp.plane;
165 int depth = comp.depth_minus1+1;
166 int step = comp.step_minus1+1;
167 int flags = desc->flags;
168
169 if (flags & PIX_FMT_BITSTREAM) {
170 int skip = x*step + comp.offset_plus1-1;
171 uint8_t *p = data[plane] + y*linesize[plane] + (skip>>3);
172 int shift = 8 - depth - (skip&7);
173
174 while (w--) {
175 *p |= *src++ << shift;
176 shift -= step;
177 p -= shift>>3;
178 shift &= 7;
179 }
180 } else {
181 int shift = comp.shift;
182 uint8_t *p = data[plane]+ y*linesize[plane] + x*step + comp.offset_plus1-1;
183
184 while (w--) {
185 if (flags & PIX_FMT_BE) {
186 uint16_t val = AV_RB16(p) | (*src++<<shift);
187 AV_WB16(p, val);
188 } else {
189 uint16_t val = AV_RL16(p) | (*src++<<shift);
190 AV_WL16(p, val);
191 }
192 p+= step;
193 }
194 }
195}
5499a313 196
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197/**
198 * Returns the number of bits per pixel used by the pixel format
199 * described by pixdesc.
200 *
201 * The returned number of bits refers to the number of bits actually
202 * used for storing the pixel information, that is padding bits are
203 * not counted.
204 */
205int av_get_bits_per_pixel(const AVPixFmtDescriptor *pixdesc);
206
51135d1d 207#endif /* AVUTIL_PIXDESC_H */