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FFmpeg/libavfilter/vf_noise.c
Clément Bœsch 50e66726a2 lavfi: use ceil right shift for chroma width/height. 
This should fix several issues with odd dimensions inputs.

lut, vflip, pad and crop video filters also need to be checked for such
issues. It's possible sws is also affected.
2013-05-10 17:20:06 +02:00

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/*
* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2013 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* noise generator
*/
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/lfg.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/x86/asm.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#define MAX_NOISE 4096
#define MAX_SHIFT 1024
#define MAX_RES (MAX_NOISE-MAX_SHIFT)
#define NOISE_UNIFORM 1
#define NOISE_TEMPORAL 2
#define NOISE_AVERAGED 8
#define NOISE_PATTERN 16
typedef struct {
int strength;
unsigned flags;
int shiftptr;
AVLFG lfg;
int seed;
int8_t *noise;
int8_t *prev_shift[MAX_RES][3];
} FilterParams;
typedef struct {
const AVClass *class;
int nb_planes;
int linesize[4];
int height[4];
FilterParams all;
FilterParams param[4];
int rand_shift[MAX_RES];
int rand_shift_init;
void (*line_noise)(uint8_t *dst, const uint8_t *src, int8_t *noise, int len, int shift);
void (*line_noise_avg)(uint8_t *dst, const uint8_t *src, int len, int8_t **shift);
} NoiseContext;
#define OFFSET(x) offsetof(NoiseContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define NOISE_PARAMS(name, x, param) \
{#name"_seed", "set component #"#x" noise seed", OFFSET(param.seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS}, \
{#name"_strength", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
{#name"s", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
{#name"_flags", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
{#name"f", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
{"a", "averaged noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_AVERAGED}, 0, 0, FLAGS, #name"_flags"}, \
{"p", "(semi)regular pattern", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_PATTERN}, 0, 0, FLAGS, #name"_flags"}, \
{"t", "temporal noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_TEMPORAL}, 0, 0, FLAGS, #name"_flags"}, \
{"u", "uniform noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_UNIFORM}, 0, 0, FLAGS, #name"_flags"},
static const AVOption noise_options[] = {
NOISE_PARAMS(all, 0, all)
NOISE_PARAMS(c0, 0, param[0])
NOISE_PARAMS(c1, 1, param[1])
NOISE_PARAMS(c2, 2, param[2])
NOISE_PARAMS(c3, 3, param[3])
{NULL}
};
AVFILTER_DEFINE_CLASS(noise);
static const int8_t patt[4] = { -1, 0, 1, 0 };
#define RAND_N(range) ((int) ((double) range * av_lfg_get(lfg) / (UINT_MAX + 1.0)))
static int init_noise(NoiseContext *n, int comp)
{
int8_t *noise = av_malloc(MAX_NOISE * sizeof(int8_t));
FilterParams *fp = &n->param[comp];
AVLFG *lfg = &n->param[comp].lfg;
int strength = fp->strength;
int flags = fp->flags;
int i, j;
if (!noise)
return AVERROR(ENOMEM);
av_lfg_init(&fp->lfg, fp->seed);
for (i = 0, j = 0; i < MAX_NOISE; i++, j++) {
if (flags & NOISE_UNIFORM) {
if (flags & NOISE_AVERAGED) {
if (flags & NOISE_PATTERN) {
noise[i] = (RAND_N(strength) - strength / 2) / 6
+ patt[j % 4] * strength * 0.25 / 3;
} else {
noise[i] = (RAND_N(strength) - strength / 2) / 3;
}
} else {
if (flags & NOISE_PATTERN) {
noise[i] = (RAND_N(strength) - strength / 2) / 2
+ patt[j % 4] * strength * 0.25;
} else {
noise[i] = RAND_N(strength) - strength / 2;
}
}
} else {
double x1, x2, w, y1;
do {
x1 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0;
x2 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0;
w = x1 * x1 + x2 * x2;
} while (w >= 1.0);
w = sqrt((-2.0 * log(w)) / w);
y1 = x1 * w;
y1 *= strength / sqrt(3.0);
if (flags & NOISE_PATTERN) {
y1 /= 2;
y1 += patt[j % 4] * strength * 0.35;
}
y1 = av_clipf(y1, -128, 127);
if (flags & NOISE_AVERAGED)
y1 /= 3.0;
noise[i] = (int)y1;
}
if (RAND_N(6) == 0)
j--;
}
for (i = 0; i < MAX_RES; i++)
for (j = 0; j < 3; j++)
fp->prev_shift[i][j] = noise + (av_lfg_get(lfg) & (MAX_SHIFT - 1));
if (!n->rand_shift_init) {
for (i = 0; i < MAX_RES; i++)
n->rand_shift[i] = av_lfg_get(lfg) & (MAX_SHIFT - 1);
n->rand_shift_init = 1;
}
fp->noise = noise;
fp->shiftptr = 0;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats = NULL;
int fmt;
for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
if (desc->flags & PIX_FMT_PLANAR && !((desc->comp[0].depth_minus1 + 1) & 7))
ff_add_format(&formats, fmt);
}
ff_set_common_formats(ctx, formats);
return 0;
}
static int config_input(AVFilterLink *inlink)
{
NoiseContext *n = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int i, ret;
for (i = 0; i < desc->nb_components; i++)
n->nb_planes = FFMAX(n->nb_planes, desc->comp[i].plane);
n->nb_planes++;
if ((ret = av_image_fill_linesizes(n->linesize, inlink->format, inlink->w)) < 0)
return ret;
n->height[1] = n->height[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
n->height[0] = n->height[3] = inlink->h;
return 0;
}
static inline void line_noise_c(uint8_t *dst, const uint8_t *src, int8_t *noise,
int len, int shift)
{
int i;
noise += shift;
for (i = 0; i < len; i++) {
int v = src[i] + noise[i];
dst[i] = av_clip_uint8(v);
}
}
#define ASMALIGN(ZEROBITS) ".p2align " #ZEROBITS "\n\t"
static void line_noise_mmx(uint8_t *dst, const uint8_t *src,
int8_t *noise, int len, int shift)
{
#if HAVE_MMX_INLINE
x86_reg mmx_len= len&(~7);
noise+=shift;
__asm__ volatile(
"mov %3, %%"REG_a" \n\t"
"pcmpeqb %%mm7, %%mm7 \n\t"
"psllw $15, %%mm7 \n\t"
"packsswb %%mm7, %%mm7 \n\t"
ASMALIGN(4)
"1: \n\t"
"movq (%0, %%"REG_a"), %%mm0 \n\t"
"movq (%1, %%"REG_a"), %%mm1 \n\t"
"pxor %%mm7, %%mm0 \n\t"
"paddsb %%mm1, %%mm0 \n\t"
"pxor %%mm7, %%mm0 \n\t"
"movq %%mm0, (%2, %%"REG_a") \n\t"
"add $8, %%"REG_a" \n\t"
" js 1b \n\t"
:: "r" (src+mmx_len), "r" (noise+mmx_len), "r" (dst+mmx_len), "g" (-mmx_len)
: "%"REG_a
);
if (mmx_len!=len)
line_noise_c(dst+mmx_len, src+mmx_len, noise+mmx_len, len-mmx_len, 0);
#endif
}
static void line_noise_mmxext(uint8_t *dst, const uint8_t *src,
int8_t *noise, int len, int shift)
{
#if HAVE_MMXEXT_INLINE
x86_reg mmx_len= len&(~7);
noise+=shift;
__asm__ volatile(
"mov %3, %%"REG_a" \n\t"
"pcmpeqb %%mm7, %%mm7 \n\t"
"psllw $15, %%mm7 \n\t"
"packsswb %%mm7, %%mm7 \n\t"
ASMALIGN(4)
"1: \n\t"
"movq (%0, %%"REG_a"), %%mm0 \n\t"
"movq (%1, %%"REG_a"), %%mm1 \n\t"
"pxor %%mm7, %%mm0 \n\t"
"paddsb %%mm1, %%mm0 \n\t"
"pxor %%mm7, %%mm0 \n\t"
"movntq %%mm0, (%2, %%"REG_a") \n\t"
"add $8, %%"REG_a" \n\t"
" js 1b \n\t"
:: "r" (src+mmx_len), "r" (noise+mmx_len), "r" (dst+mmx_len), "g" (-mmx_len)
: "%"REG_a
);
if (mmx_len != len)
line_noise_c(dst+mmx_len, src+mmx_len, noise+mmx_len, len-mmx_len, 0);
#endif
}
static inline void line_noise_avg_c(uint8_t *dst, const uint8_t *src,
int len, int8_t **shift)
{
int i;
int8_t *src2 = (int8_t*)src;
for (i = 0; i < len; i++) {
const int n = shift[0][i] + shift[1][i] + shift[2][i];
dst[i] = src2[i] + ((n * src2[i]) >> 7);
}
}
static inline void line_noise_avg_mmx(uint8_t *dst, const uint8_t *src,
int len, int8_t **shift)
{
#if HAVE_MMX_INLINE
x86_reg mmx_len= len&(~7);
__asm__ volatile(
"mov %5, %%"REG_a" \n\t"
ASMALIGN(4)
"1: \n\t"
"movq (%1, %%"REG_a"), %%mm1 \n\t"
"movq (%0, %%"REG_a"), %%mm0 \n\t"
"paddb (%2, %%"REG_a"), %%mm1 \n\t"
"paddb (%3, %%"REG_a"), %%mm1 \n\t"
"movq %%mm0, %%mm2 \n\t"
"movq %%mm1, %%mm3 \n\t"
"punpcklbw %%mm0, %%mm0 \n\t"
"punpckhbw %%mm2, %%mm2 \n\t"
"punpcklbw %%mm1, %%mm1 \n\t"
"punpckhbw %%mm3, %%mm3 \n\t"
"pmulhw %%mm0, %%mm1 \n\t"
"pmulhw %%mm2, %%mm3 \n\t"
"paddw %%mm1, %%mm1 \n\t"
"paddw %%mm3, %%mm3 \n\t"
"paddw %%mm0, %%mm1 \n\t"
"paddw %%mm2, %%mm3 \n\t"
"psrlw $8, %%mm1 \n\t"
"psrlw $8, %%mm3 \n\t"
"packuswb %%mm3, %%mm1 \n\t"
"movq %%mm1, (%4, %%"REG_a") \n\t"
"add $8, %%"REG_a" \n\t"
" js 1b \n\t"
:: "r" (src+mmx_len), "r" (shift[0]+mmx_len), "r" (shift[1]+mmx_len), "r" (shift[2]+mmx_len),
"r" (dst+mmx_len), "g" (-mmx_len)
: "%"REG_a
);
if (mmx_len != len){
int8_t *shift2[3]={shift[0]+mmx_len, shift[1]+mmx_len, shift[2]+mmx_len};
line_noise_avg_c(dst+mmx_len, src+mmx_len, len-mmx_len, shift2);
}
#endif
}
static void noise(uint8_t *dst, const uint8_t *src,
int dst_linesize, int src_linesize,
int width, int height, NoiseContext *n, int comp)
{
int8_t *noise = n->param[comp].noise;
int flags = n->param[comp].flags;
AVLFG *lfg = &n->param[comp].lfg;
int shift, y;
if (!noise) {
if (dst != src) {
for (y = 0; y < height; y++) {
memcpy(dst, src, width);
dst += dst_linesize;
src += src_linesize;
}
}
return;
}
for (y = 0; y < height; y++) {
if (flags & NOISE_TEMPORAL)
shift = av_lfg_get(lfg) & (MAX_SHIFT - 1);
else
shift = n->rand_shift[y];
if (flags & NOISE_AVERAGED) {
n->line_noise_avg(dst, src, width, n->param[comp].prev_shift[y]);
n->param[comp].prev_shift[y][n->param[comp].shiftptr] = noise + shift;
} else {
n->line_noise(dst, src, noise, width, shift);
}
dst += dst_linesize;
src += src_linesize;
}
n->param[comp].shiftptr++;
if (n->param[comp].shiftptr == 3)
n->param[comp].shiftptr = 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
{
NoiseContext *n = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFrame *out;
int i;
if (av_frame_is_writable(inpicref)) {
out = inpicref;
} else {
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&inpicref);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, inpicref);
}
for (i = 0; i < n->nb_planes; i++)
noise(out->data[i], inpicref->data[i], out->linesize[i],
inpicref->linesize[i], n->linesize[i], n->height[i], n, i);
emms_c();
if (inpicref != out)
av_frame_free(&inpicref);
return ff_filter_frame(outlink, out);
}
static av_cold int init(AVFilterContext *ctx)
{
NoiseContext *n = ctx->priv;
int ret, i;
int cpu_flags = av_get_cpu_flags();
for (i = 0; i < 4; i++) {
if (n->all.seed >= 0)
n->param[i].seed = n->all.seed;
else
n->param[i].seed = 123457;
if (n->all.strength)
n->param[i].strength = n->all.strength;
if (n->all.flags)
n->param[i].flags = n->all.flags;
}
for (i = 0; i < 4; i++) {
if (n->param[i].strength && ((ret = init_noise(n, i)) < 0))
return ret;
}
if (HAVE_MMX_INLINE &&
cpu_flags & AV_CPU_FLAG_MMX) {
n->line_noise = line_noise_mmx;
n->line_noise_avg = line_noise_avg_mmx;
}
if (HAVE_MMXEXT_INLINE &&
cpu_flags & AV_CPU_FLAG_MMXEXT)
n->line_noise = line_noise_mmxext;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
NoiseContext *n = ctx->priv;
int i;
for (i = 0; i < 4; i++)
av_freep(&n->param[i].noise);
}
static const AVFilterPad noise_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
{ NULL }
};
static const AVFilterPad noise_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter avfilter_vf_noise = {
.name = "noise",
.description = NULL_IF_CONFIG_SMALL("Add noise."),
.priv_size = sizeof(NoiseContext),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.inputs = noise_inputs,
.outputs = noise_outputs,
.priv_class = &noise_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE,
};
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