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vf_elbg.c
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1 /*
2  * Copyright (c) 2013 Stefano Sabatini
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  * video quantizer filter based on ELBG
24  */
25 
26 #include "libavcodec/elbg.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/pixdesc.h"
29 #include "libavutil/random_seed.h"
30 
31 #include "avfilter.h"
32 #include "drawutils.h"
33 #include "internal.h"
34 #include "video.h"
35 
36 typedef struct ELBGContext {
37  const AVClass *class;
39  unsigned int lfg_seed;
41  int *codeword;
44  int *codebook;
48  int pal8;
49 } ELBGContext;
50 
51 #define OFFSET(x) offsetof(ELBGContext, x)
52 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
53 
54 static const AVOption elbg_options[] = {
55  { "codebook_length", "set codebook length", OFFSET(codebook_length), AV_OPT_TYPE_INT, { .i64 = 256 }, 1, INT_MAX, FLAGS },
56  { "l", "set codebook length", OFFSET(codebook_length), AV_OPT_TYPE_INT, { .i64 = 256 }, 1, INT_MAX, FLAGS },
57  { "nb_steps", "set max number of steps used to compute the mapping", OFFSET(max_steps_nb), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, INT_MAX, FLAGS },
58  { "n", "set max number of steps used to compute the mapping", OFFSET(max_steps_nb), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, INT_MAX, FLAGS },
59  { "seed", "set the random seed", OFFSET(lfg_seed), AV_OPT_TYPE_INT, {.i64 = -1}, -1, UINT32_MAX, FLAGS },
60  { "s", "set the random seed", OFFSET(lfg_seed), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, UINT32_MAX, FLAGS },
61  { "pal8", "set the pal8 output", OFFSET(pal8), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
62  { NULL }
63 };
64 
66 
68 {
69  ELBGContext *elbg = ctx->priv;
70 
71  if (elbg->pal8 && elbg->codebook_length > 256) {
72  av_log(ctx, AV_LOG_ERROR, "pal8 output allows max 256 codebook length.\n");
73  return AVERROR(EINVAL);
74  }
75 
76  if (elbg->lfg_seed == -1)
77  elbg->lfg_seed = av_get_random_seed();
78 
79  av_lfg_init(&elbg->lfg, elbg->lfg_seed);
80  return 0;
81 }
82 
84 {
85  ELBGContext *elbg = ctx->priv;
86  int ret;
87 
88  static const enum AVPixelFormat pix_fmts[] = {
92  };
93  if (!elbg->pal8) {
94  AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
95  if (!fmts_list)
96  return AVERROR(ENOMEM);
97  return ff_set_common_formats(ctx, fmts_list);
98  } else {
99  static const enum AVPixelFormat pal8_fmt[] = {
102  };
103  if ((ret = ff_formats_ref(ff_make_format_list(pix_fmts), &ctx->inputs[0]->out_formats)) < 0 ||
104  (ret = ff_formats_ref(ff_make_format_list(pal8_fmt), &ctx->outputs[0]->in_formats)) < 0)
105  return ret;
106  }
107  return 0;
108 }
109 
110 #define NB_COMPONENTS 3
111 
112 static int config_input(AVFilterLink *inlink)
113 {
114  AVFilterContext *ctx = inlink->dst;
115  ELBGContext *elbg = ctx->priv;
116 
117  elbg->pix_desc = av_pix_fmt_desc_get(inlink->format);
118  elbg->codeword_length = inlink->w * inlink->h;
119  elbg->codeword = av_realloc_f(elbg->codeword, elbg->codeword_length,
120  NB_COMPONENTS * sizeof(*elbg->codeword));
121  if (!elbg->codeword)
122  return AVERROR(ENOMEM);
123 
126  sizeof(*elbg->codeword_closest_codebook_idxs));
128  return AVERROR(ENOMEM);
129 
130  elbg->codebook = av_realloc_f(elbg->codebook, elbg->codebook_length,
131  NB_COMPONENTS * sizeof(*elbg->codebook));
132  if (!elbg->codebook)
133  return AVERROR(ENOMEM);
134 
135  ff_fill_rgba_map(elbg->rgba_map, inlink->format);
136 
137  return 0;
138 }
139 
140 #define R 0
141 #define G 1
142 #define B 2
143 
144 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
145 {
146  ELBGContext *elbg = inlink->dst->priv;
147  int i, j, k;
148  uint8_t *p, *p0;
149 
150  const uint8_t r_idx = elbg->rgba_map[R];
151  const uint8_t g_idx = elbg->rgba_map[G];
152  const uint8_t b_idx = elbg->rgba_map[B];
153 
154  /* build the codeword */
155  p0 = frame->data[0];
156  k = 0;
157  for (i = 0; i < inlink->h; i++) {
158  p = p0;
159  for (j = 0; j < inlink->w; j++) {
160  elbg->codeword[k++] = p[r_idx];
161  elbg->codeword[k++] = p[g_idx];
162  elbg->codeword[k++] = p[b_idx];
163  p += elbg->pix_desc->nb_components;
164  }
165  p0 += frame->linesize[0];
166  }
167 
168  /* compute the codebook */
170  elbg->codebook, elbg->codebook_length, elbg->max_steps_nb,
171  elbg->codeword_closest_codebook_idxs, &elbg->lfg);
173  elbg->codebook, elbg->codebook_length, elbg->max_steps_nb,
174  elbg->codeword_closest_codebook_idxs, &elbg->lfg);
175 
176  if (elbg->pal8) {
177  AVFilterLink *outlink = inlink->dst->outputs[0];
178  AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
179  uint32_t *pal;
180 
181  if (!out)
182  return AVERROR(ENOMEM);
183  out->pts = frame->pts;
184  av_frame_free(&frame);
185  pal = (uint32_t *)out->data[1];
186  p0 = (uint8_t *)out->data[0];
187 
188  for (i = 0; i < elbg->codebook_length; i++) {
189  pal[i] = 0xFFU << 24 |
190  (elbg->codebook[i*3 ] << 16) |
191  (elbg->codebook[i*3+1] << 8) |
192  elbg->codebook[i*3+2];
193  }
194 
195  k = 0;
196  for (i = 0; i < inlink->h; i++) {
197  p = p0;
198  for (j = 0; j < inlink->w; j++, p++) {
199  p[0] = elbg->codeword_closest_codebook_idxs[k++];
200  }
201  p0 += out->linesize[0];
202  }
203 
204  return ff_filter_frame(outlink, out);
205  }
206 
207  /* fill the output with the codebook values */
208  p0 = frame->data[0];
209 
210  k = 0;
211  for (i = 0; i < inlink->h; i++) {
212  p = p0;
213  for (j = 0; j < inlink->w; j++) {
214  int cb_idx = NB_COMPONENTS * elbg->codeword_closest_codebook_idxs[k++];
215  p[r_idx] = elbg->codebook[cb_idx];
216  p[g_idx] = elbg->codebook[cb_idx+1];
217  p[b_idx] = elbg->codebook[cb_idx+2];
218  p += elbg->pix_desc->nb_components;
219  }
220  p0 += frame->linesize[0];
221  }
222 
223  return ff_filter_frame(inlink->dst->outputs[0], frame);
224 }
225 
227 {
228  ELBGContext *elbg = ctx->priv;
229 
230  av_freep(&elbg->codebook);
231  av_freep(&elbg->codeword);
233 }
234 
235 static const AVFilterPad elbg_inputs[] = {
236  {
237  .name = "default",
238  .type = AVMEDIA_TYPE_VIDEO,
239  .config_props = config_input,
240  .filter_frame = filter_frame,
241  .needs_writable = 1,
242  },
243  { NULL }
244 };
245 
246 static const AVFilterPad elbg_outputs[] = {
247  {
248  .name = "default",
249  .type = AVMEDIA_TYPE_VIDEO,
250  },
251  { NULL }
252 };
253 
255  .name = "elbg",
256  .description = NULL_IF_CONFIG_SMALL("Apply posterize effect, using the ELBG algorithm."),
257  .priv_size = sizeof(ELBGContext),
258  .priv_class = &elbg_class,
260  .init = init,
261  .uninit = uninit,
262  .inputs = elbg_inputs,
263  .outputs = elbg_outputs,
264 };
Definition: lfg.h:27
#define NULL
Definition: coverity.c:32
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_elbg.c:226
AVFilter ff_vf_elbg
Definition: vf_elbg.c:254
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2363
This structure describes decoded (raw) audio or video data.
Definition: frame.h:218
#define av_realloc_f(p, o, n)
AVOption.
Definition: opt.h:246
#define OFFSET(x)
Definition: vf_elbg.c:51
Main libavfilter public API header.
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:64
static int config_input(AVFilterLink *inlink)
Definition: vf_elbg.c:112
#define B
Definition: vf_elbg.c:142
int * codebook
Definition: vf_elbg.c:44
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:99
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283
static const AVFilterPad elbg_inputs[]
Definition: vf_elbg.c:235
const char * name
Pad name.
Definition: internal.h:60
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1080
uint8_t
#define av_cold
Definition: attributes.h:82
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
AVOptions.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:311
unsigned int lfg_seed
Definition: vf_elbg.c:39
int avpriv_do_elbg(int *points, int dim, int numpoints, int *codebook, int numCB, int max_steps, int *closest_cb, AVLFG *rand_state)
Implementation of the Enhanced LBG Algorithm Based on the paper "Neural Networks 14:1219-1237" that c...
Definition: elbg.c:371
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:90
static AVFrame * frame
int pal8
Definition: vf_elbg.c:48
#define av_log(a,...)
AVLFG lfg
Definition: vf_elbg.c:38
A filter pad used for either input or output.
Definition: internal.h:54
#define U(x)
Definition: vp56_arith.h:37
int max_steps_nb
Definition: vf_elbg.c:40
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:568
static int query_formats(AVFilterContext *ctx)
Definition: vf_elbg.c:83
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:91
void * priv
private data for use by the filter
Definition: avfilter.h:353
#define FLAGS
Definition: vf_elbg.c:52
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:88
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:89
static const AVOption elbg_options[]
Definition: vf_elbg.c:54
int * codeword
Definition: vf_elbg.c:41
uint8_t nb_components
The number of components each pixel has, (1-4)
Definition: pixdesc.h:83
int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
Add *ref as a new reference to formats.
Definition: formats.c:440
AVFormatContext * ctx
Definition: movenc.c:48
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
Definition: drawutils.c:35
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: vf_elbg.c:144
static const AVFilterPad elbg_outputs[]
Definition: vf_elbg.c:246
static av_cold int init(AVFilterContext *ctx)
Definition: vf_elbg.c:67
uint8_t rgba_map[4]
Definition: vf_elbg.c:47
int avpriv_init_elbg(int *points, int dim, int numpoints, int *codebook, int numCB, int max_steps, int *closest_cb, AVLFG *rand_state)
Initialize the **codebook vector for the elbg algorithm.
Definition: elbg.c:337
misc drawing utilities
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:249
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
Describe the class of an AVClass context structure.
Definition: log.h:67
const AVPixFmtDescriptor * pix_desc
Definition: vf_elbg.c:46
Filter definition.
Definition: avfilter.h:144
const char * name
Filter name.
Definition: avfilter.h:148
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:32
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:266
#define G
Definition: vf_elbg.c:141
#define NB_COMPONENTS
Definition: vf_elbg.c:110
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:232
int codeword_length
Definition: vf_elbg.c:42
int codebook_length
Definition: vf_elbg.c:45
AVFILTER_DEFINE_CLASS(elbg)
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:338
FILE * out
Definition: movenc.c:54
#define av_freep(p)
uint32_t av_get_random_seed(void)
Get a seed to use in conjunction with random functions.
Definition: random_seed.c:120
internal API functions
#define R
Definition: vf_elbg.c:140
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
int * codeword_closest_codebook_idxs
Definition: vf_elbg.c:43