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FFmpeg/libavfilter/vf_pp7.c
Andreas Rheinhardt b4f5201967 avfilter: Replace query_formats callback with union of list and callback 
If one looks at the many query_formats callbacks in existence,
one will immediately recognize that there is one type of default
callback for video and a slightly different default callback for
audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);"
for video with a filter-specific pix_fmts list. For audio, it is
the same with a filter-specific sample_fmts list together with
ff_set_common_all_samplerates() and ff_set_common_all_channel_counts().

This commit allows to remove the boilerplate query_formats callbacks
by replacing said callback with a union consisting the old callback
and pointers for pixel and sample format arrays. For the not uncommon
case in which these lists only contain a single entry (besides the
sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also
added to the union to store them directly in the AVFilter,
thereby avoiding a relocation.

The state of said union will be contained in a new, dedicated AVFilter
field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t
in order to create a hole for this new field; this is no problem, as
the maximum of all the nb_inputs is four; for nb_outputs it is only
two).

The state's default value coincides with the earlier default of
query_formats being unset, namely that the filter accepts all formats
(and also sample rates and channel counts/layouts for audio)
provided that these properties agree coincide for all inputs and
outputs.

By using different union members for audio and video filters
the type-unsafety of using the same functions for audio and video
lists will furthermore be more confined to formats.c than before.

When the new fields are used, they will also avoid allocations:
Currently something nearly equivalent to ff_default_query_formats()
is called after every successful call to a query_formats callback;
yet in the common case that the newly allocated AVFilterFormats
are not used at all (namely if there are no free links) these newly
allocated AVFilterFormats are freed again without ever being used.
Filters no longer using the callback will not exhibit this any more.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-10-05 17:48:25 +02:00

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/*
* Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2014 Arwa Arif <arwaarif1994@gmail.com>
*
* 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
* Postprocessing filter - 7
*
* Originally written by Michael Niedermayer for the MPlayer
* project, and ported by Arwa Arif for FFmpeg.
*/
#include "libavutil/imgutils.h"
#include "libavutil/mem_internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "internal.h"
#include "qp_table.h"
#include "vf_pp7.h"
enum mode {
MODE_HARD,
MODE_SOFT,
MODE_MEDIUM
};
#define OFFSET(x) offsetof(PP7Context, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption pp7_options[] = {
{ "qp", "force a constant quantizer parameter", OFFSET(qp), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 64, FLAGS },
{ "mode", "set thresholding mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_MEDIUM}, 0, 2, FLAGS, "mode" },
{ "hard", "hard thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_HARD}, INT_MIN, INT_MAX, FLAGS, "mode" },
{ "soft", "soft thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_SOFT}, INT_MIN, INT_MAX, FLAGS, "mode" },
{ "medium", "medium thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_MEDIUM}, INT_MIN, INT_MAX, FLAGS, "mode" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(pp7);
DECLARE_ALIGNED(8, static const uint8_t, dither)[8][8] = {
{ 0, 48, 12, 60, 3, 51, 15, 63, },
{ 32, 16, 44, 28, 35, 19, 47, 31, },
{ 8, 56, 4, 52, 11, 59, 7, 55, },
{ 40, 24, 36, 20, 43, 27, 39, 23, },
{ 2, 50, 14, 62, 1, 49, 13, 61, },
{ 34, 18, 46, 30, 33, 17, 45, 29, },
{ 10, 58, 6, 54, 9, 57, 5, 53, },
{ 42, 26, 38, 22, 41, 25, 37, 21, },
};
#define N0 4
#define N1 5
#define N2 10
#define SN0 2
#define SN1 2.2360679775
#define SN2 3.16227766017
#define N (1 << 16)
static const int factor[16] = {
N / (N0 * N0), N / (N0 * N1), N / (N0 * N0), N / (N0 * N2),
N / (N1 * N0), N / (N1 * N1), N / (N1 * N0), N / (N1 * N2),
N / (N0 * N0), N / (N0 * N1), N / (N0 * N0), N / (N0 * N2),
N / (N2 * N0), N / (N2 * N1), N / (N2 * N0), N / (N2 * N2),
};
static void init_thres2(PP7Context *p)
{
int qp, i;
int bias = 0; //FIXME
for (qp = 0; qp < 99; qp++) {
for (i = 0; i < 16; i++) {
p->thres2[qp][i] = ((i&1) ? SN2 : SN0) * ((i&4) ? SN2 : SN0) * FFMAX(1, qp) * (1<<2) - 1 - bias;
}
}
}
static inline void dctA_c(int16_t *dst, uint8_t *src, int stride)
{
int i;
for (i = 0; i < 4; i++) {
int s0 = src[0 * stride] + src[6 * stride];
int s1 = src[1 * stride] + src[5 * stride];
int s2 = src[2 * stride] + src[4 * stride];
int s3 = src[3 * stride];
int s = s3 + s3;
s3 = s - s0;
s0 = s + s0;
s = s2 + s1;
s2 = s2 - s1;
dst[0] = s0 + s;
dst[2] = s0 - s;
dst[1] = 2 * s3 + s2;
dst[3] = s3 - 2 * s2;
src++;
dst += 4;
}
}
static void dctB_c(int16_t *dst, int16_t *src)
{
int i;
for (i = 0; i < 4; i++) {
int s0 = src[0 * 4] + src[6 * 4];
int s1 = src[1 * 4] + src[5 * 4];
int s2 = src[2 * 4] + src[4 * 4];
int s3 = src[3 * 4];
int s = s3 + s3;
s3 = s - s0;
s0 = s + s0;
s = s2 + s1;
s2 = s2 - s1;
dst[0 * 4] = s0 + s;
dst[2 * 4] = s0 - s;
dst[1 * 4] = 2 * s3 + s2;
dst[3 * 4] = s3 - 2 * s2;
src++;
dst++;
}
}
static int hardthresh_c(PP7Context *p, int16_t *src, int qp)
{
int i;
int a;
a = src[0] * factor[0];
for (i = 1; i < 16; i++) {
unsigned int threshold1 = p->thres2[qp][i];
unsigned int threshold2 = threshold1 << 1;
int level = src[i];
if (((unsigned)(level + threshold1)) > threshold2)
a += level * factor[i];
}
return (a + (1 << 11)) >> 12;
}
static int mediumthresh_c(PP7Context *p, int16_t *src, int qp)
{
int i;
int a;
a = src[0] * factor[0];
for (i = 1; i < 16; i++) {
unsigned int threshold1 = p->thres2[qp][i];
unsigned int threshold2 = threshold1 << 1;
int level = src[i];
if (((unsigned)(level + threshold1)) > threshold2) {
if (((unsigned)(level + 2 * threshold1)) > 2 * threshold2)
a += level * factor[i];
else {
if (level > 0)
a += 2 * (level - (int)threshold1) * factor[i];
else
a += 2 * (level + (int)threshold1) * factor[i];
}
}
}
return (a + (1 << 11)) >> 12;
}
static int softthresh_c(PP7Context *p, int16_t *src, int qp)
{
int i;
int a;
a = src[0] * factor[0];
for (i = 1; i < 16; i++) {
unsigned int threshold1 = p->thres2[qp][i];
unsigned int threshold2 = threshold1 << 1;
int level = src[i];
if (((unsigned)(level + threshold1)) > threshold2) {
if (level > 0)
a += (level - (int)threshold1) * factor[i];
else
a += (level + (int)threshold1) * factor[i];
}
}
return (a + (1 << 11)) >> 12;
}
static void filter(PP7Context *p, uint8_t *dst, uint8_t *src,
int dst_stride, int src_stride,
int width, int height,
uint8_t *qp_store, int qp_stride, int is_luma)
{
int x, y;
const int stride = is_luma ? p->temp_stride : ((width + 16 + 15) & (~15));
uint8_t *p_src = p->src + 8 * stride;
int16_t *block = (int16_t *)p->src;
int16_t *temp = (int16_t *)(p->src + 32);
if (!src || !dst) return;
for (y = 0; y < height; y++) {
int index = 8 + 8 * stride + y * stride;
memcpy(p_src + index, src + y * src_stride, width);
for (x = 0; x < 8; x++) {
p_src[index - x - 1]= p_src[index + x ];
p_src[index + width + x ]= p_src[index + width - x - 1];
}
}
for (y = 0; y < 8; y++) {
memcpy(p_src + ( 7 - y ) * stride, p_src + ( y + 8 ) * stride, stride);
memcpy(p_src + (height + 8 + y) * stride, p_src + (height - y + 7) * stride, stride);
}
//FIXME (try edge emu)
for (y = 0; y < height; y++) {
for (x = -8; x < 0; x += 4) {
const int index = x + y * stride + (8 - 3) * (1 + stride) + 8; //FIXME silly offset
uint8_t *src = p_src + index;
int16_t *tp = temp + 4 * x;
dctA_c(tp + 4 * 8, src, stride);
}
for (x = 0; x < width; ) {
const int qps = 3 + is_luma;
int qp;
int end = FFMIN(x + 8, width);
if (p->qp)
qp = p->qp;
else {
qp = qp_store[ (FFMIN(x, width - 1) >> qps) + (FFMIN(y, height - 1) >> qps) * qp_stride];
qp = ff_norm_qscale(qp, p->qscale_type);
}
for (; x < end; x++) {
const int index = x + y * stride + (8 - 3) * (1 + stride) + 8; //FIXME silly offset
uint8_t *src = p_src + index;
int16_t *tp = temp + 4 * x;
int v;
if ((x & 3) == 0)
dctA_c(tp + 4 * 8, src, stride);
p->dctB(block, tp);
v = p->requantize(p, block, qp);
v = (v + dither[y & 7][x & 7]) >> 6;
if ((unsigned)v > 255)
v = (-v) >> 31;
dst[x + y * dst_stride] = v;
}
}
}
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_GBRP,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
PP7Context *pp7 = ctx->priv;
const int h = FFALIGN(inlink->h + 16, 16);
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
pp7->hsub = desc->log2_chroma_w;
pp7->vsub = desc->log2_chroma_h;
pp7->temp_stride = FFALIGN(inlink->w + 16, 16);
pp7->src = av_malloc_array(pp7->temp_stride, (h + 8) * sizeof(uint8_t));
if (!pp7->src)
return AVERROR(ENOMEM);
init_thres2(pp7);
switch (pp7->mode) {
case 0: pp7->requantize = hardthresh_c; break;
case 1: pp7->requantize = softthresh_c; break;
default:
case 2: pp7->requantize = mediumthresh_c; break;
}
pp7->dctB = dctB_c;
if (ARCH_X86)
ff_pp7_init_x86(pp7);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
PP7Context *pp7 = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out = in;
int qp_stride = 0;
int8_t *qp_table = NULL;
if (!pp7->qp) {
int ret = ff_qp_table_extract(in, &qp_table, &qp_stride, NULL, &pp7->qscale_type);
if (ret < 0) {
av_frame_free(&in);
return ret;
}
}
if (!ctx->is_disabled) {
const int cw = AV_CEIL_RSHIFT(inlink->w, pp7->hsub);
const int ch = AV_CEIL_RSHIFT(inlink->h, pp7->vsub);
/* get a new frame if in-place is not possible or if the dimensions
* are not multiple of 8 */
if (!av_frame_is_writable(in) || (inlink->w & 7) || (inlink->h & 7)) {
const int aligned_w = FFALIGN(inlink->w, 8);
const int aligned_h = FFALIGN(inlink->h, 8);
out = ff_get_video_buffer(outlink, aligned_w, aligned_h);
if (!out) {
av_frame_free(&in);
av_freep(&qp_table);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
out->width = in->width;
out->height = in->height;
}
if (qp_table || pp7->qp) {
filter(pp7, out->data[0], in->data[0], out->linesize[0], in->linesize[0],
inlink->w, inlink->h, qp_table, qp_stride, 1);
filter(pp7, out->data[1], in->data[1], out->linesize[1], in->linesize[1],
cw, ch, qp_table, qp_stride, 0);
filter(pp7, out->data[2], in->data[2], out->linesize[2], in->linesize[2],
cw, ch, qp_table, qp_stride, 0);
emms_c();
}
}
if (in != out) {
if (in->data[3])
av_image_copy_plane(out->data[3], out->linesize[3],
in ->data[3], in ->linesize[3],
inlink->w, inlink->h);
av_frame_free(&in);
}
av_freep(&qp_table);
return ff_filter_frame(outlink, out);
}
static av_cold void uninit(AVFilterContext *ctx)
{
PP7Context *pp7 = ctx->priv;
av_freep(&pp7->src);
}
static const AVFilterPad pp7_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
static const AVFilterPad pp7_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_pp7 = {
.name = "pp7",
.description = NULL_IF_CONFIG_SMALL("Apply Postprocessing 7 filter."),
.priv_size = sizeof(PP7Context),
.uninit = uninit,
FILTER_INPUTS(pp7_inputs),
FILTER_OUTPUTS(pp7_outputs),
FILTER_QUERY_FUNC(query_formats),
.priv_class = &pp7_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};
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