/*
* 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/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "internal.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
};
AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
if (!fmts_list)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, fmts_list);
}
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;
uint8_t *qp_table = NULL;
if (!pp7->qp)
qp_table = av_frame_get_qp_table(in, &qp_stride, &pp7->qscale_type);
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);
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);
}
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,
},
{ NULL }
};
static const AVFilterPad pp7_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_pp7 = {
.name = "pp7",
.description = NULL_IF_CONFIG_SMALL("Apply Postprocessing 7 filter."),
.priv_size = sizeof(PP7Context),
.uninit = uninit,
.query_formats = query_formats,
.inputs = pp7_inputs,
.outputs = pp7_outputs,
.priv_class = &pp7_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};