/*
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2013 Clément Bœsch <u pkh me>
*
* 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
* Simple post processing filter
*
* This implementation is based on an algorithm described in
* "Aria Nosratinia Embedded Post-Processing for
* Enhancement of Compressed Images (1999)"
*
* Originally written by Michael Niedermayer for the MPlayer project, and
* ported by Clément Bœsch for FFmpeg.
*/
#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "internal.h"
#include "vf_spp.h"
enum mode {
MODE_HARD,
MODE_SOFT,
NB_MODES
};
static const AVClass *child_class_next(const AVClass *prev)
{
return prev ? NULL : avcodec_dct_get_class();
}
static void *child_next(void *obj, void *prev)
{
SPPContext *s = obj;
return prev ? NULL : s->dct;
}
#define OFFSET(x) offsetof(SPPContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption spp_options[] = {
{ "quality", "set quality", OFFSET(log2_count), AV_OPT_TYPE_INT, {.i64 = 3}, 0, MAX_LEVEL, FLAGS },
{ "qp", "force a constant quantizer parameter", OFFSET(qp), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 63, FLAGS },
{ "mode", "set thresholding mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_HARD}, 0, NB_MODES - 1, 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" },
{ "use_bframe_qp", "use B-frames' QP", OFFSET(use_bframe_qp), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
{ NULL }
};
static const AVClass spp_class = {
.class_name = "spp",
.item_name = av_default_item_name,
.option = spp_options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_FILTER,
.child_class_next = child_class_next,
.child_next = child_next,
};
// XXX: share between filters?
DECLARE_ALIGNED(8, static const uint8_t, ldither)[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 },
};
static const uint8_t offset[127][2] = {
{0,0},
{0,0}, {4,4}, // quality = 1
{0,0}, {2,2}, {6,4}, {4,6}, // quality = 2
{0,0}, {5,1}, {2,2}, {7,3}, {4,4}, {1,5}, {6,6}, {3,7}, // quality = 3
{0,0}, {4,0}, {1,1}, {5,1}, {3,2}, {7,2}, {2,3}, {6,3}, // quality = 4
{0,4}, {4,4}, {1,5}, {5,5}, {3,6}, {7,6}, {2,7}, {6,7},
{0,0}, {0,2}, {0,4}, {0,6}, {1,1}, {1,3}, {1,5}, {1,7}, // quality = 5
{2,0}, {2,2}, {2,4}, {2,6}, {3,1}, {3,3}, {3,5}, {3,7},
{4,0}, {4,2}, {4,4}, {4,6}, {5,1}, {5,3}, {5,5}, {5,7},
{6,0}, {6,2}, {6,4}, {6,6}, {7,1}, {7,3}, {7,5}, {7,7},
{0,0}, {4,4}, {0,4}, {4,0}, {2,2}, {6,6}, {2,6}, {6,2}, // quality = 6
{0,2}, {4,6}, {0,6}, {4,2}, {2,0}, {6,4}, {2,4}, {6,0},
{1,1}, {5,5}, {1,5}, {5,1}, {3,3}, {7,7}, {3,7}, {7,3},
{1,3}, {5,7}, {1,7}, {5,3}, {3,1}, {7,5}, {3,5}, {7,1},
{0,1}, {4,5}, {0,5}, {4,1}, {2,3}, {6,7}, {2,7}, {6,3},
{0,3}, {4,7}, {0,7}, {4,3}, {2,1}, {6,5}, {2,5}, {6,1},
{1,0}, {5,4}, {1,4}, {5,0}, {3,2}, {7,6}, {3,6}, {7,2},
{1,2}, {5,6}, {1,6}, {5,2}, {3,0}, {7,4}, {3,4}, {7,0},
};
static void hardthresh_c(int16_t dst[64], const int16_t src[64],
int qp, const uint8_t *permutation)
{
int i;
int bias = 0; // FIXME
unsigned threshold1 = qp * ((1<<4) - bias) - 1;
unsigned threshold2 = threshold1 << 1;
memset(dst, 0, 64 * sizeof(dst[0]));
dst[0] = (src[0] + 4) >> 3;
for (i = 1; i < 64; i++) {
int level = src[i];
if (((unsigned)(level + threshold1)) > threshold2) {
const int j = permutation[i];
dst[j] = (level + 4) >> 3;
}
}
}
static void softthresh_c(int16_t dst[64], const int16_t src[64],
int qp, const uint8_t *permutation)
{
int i;
int bias = 0; //FIXME
unsigned threshold1 = qp * ((1<<4) - bias) - 1;
unsigned threshold2 = threshold1 << 1;
memset(dst, 0, 64 * sizeof(dst[0]));
dst[0] = (src[0] + 4) >> 3;
for (i = 1; i < 64; i++) {
int level = src[i];
if (((unsigned)(level + threshold1)) > threshold2) {
const int j = permutation[i];
if (level > 0) dst[j] = (level - threshold1 + 4) >> 3;
else dst[j] = (level + threshold1 + 4) >> 3;
}
}
}
static void store_slice_c(uint8_t *dst, const int16_t *src,
int dst_linesize, int src_linesize,
int width, int height, int log2_scale,
const uint8_t dither[8][8])
{
int y, x;
#define STORE(pos) do { \
temp = ((src[x + y*src_linesize + pos] << log2_scale) + d[pos]) >> 6; \
if (temp & 0x100) \
temp = ~(temp >> 31); \
dst[x + y*dst_linesize + pos] = temp; \
} while (0)
for (y = 0; y < height; y++) {
const uint8_t *d = dither[y];
for (x = 0; x < width; x += 8) {
int temp;
STORE(0);
STORE(1);
STORE(2);
STORE(3);
STORE(4);
STORE(5);
STORE(6);
STORE(7);
}
}
}
static void store_slice16_c(uint16_t *dst, const int16_t *src,
int dst_linesize, int src_linesize,
int width, int height, int log2_scale,
const uint8_t dither[8][8], int depth)
{
int y, x;
unsigned int mask = -1<<depth;
#define STORE16(pos) do { \
temp = ((src[x + y*src_linesize + pos] << log2_scale) + (d[pos]>>1)) >> 5; \
if (temp & mask ) \
temp = ~(temp >> 31); \
dst[x + y*dst_linesize + pos] = temp; \
} while (0)
for (y = 0; y < height; y++) {
const uint8_t *d = dither[y];
for (x = 0; x < width; x += 8) {
int temp;
STORE16(0);
STORE16(1);
STORE16(2);
STORE16(3);
STORE16(4);
STORE16(5);
STORE16(6);
STORE16(7);
}
}
}
static inline void add_block(uint16_t *dst, int linesize, const int16_t block[64])
{
int y;
for (y = 0; y < 8; y++) {
*(uint32_t *)&dst[0 + y*linesize] += *(uint32_t *)&block[0 + y*8];
*(uint32_t *)&dst[2 + y*linesize] += *(uint32_t *)&block[2 + y*8];
*(uint32_t *)&dst[4 + y*linesize] += *(uint32_t *)&block[4 + y*8];
*(uint32_t *)&dst[6 + y*linesize] += *(uint32_t *)&block[6 + y*8];
}
}
static void filter(SPPContext *p, uint8_t *dst, uint8_t *src,
int dst_linesize, int src_linesize, int width, int height,
const uint8_t *qp_table, int qp_stride, int is_luma, int depth)
{
int x, y, i;
const int count = 1 << p->log2_count;
const int linesize = is_luma ? p->temp_linesize : FFALIGN(width+16, 16);
DECLARE_ALIGNED(16, uint64_t, block_align)[32];
int16_t *block = (int16_t *)block_align;
int16_t *block2 = (int16_t *)(block_align + 16);
uint16_t *psrc16 = (uint16_t*)p->src;
const int sample_bytes = (depth+7) / 8;
for (y = 0; y < height; y++) {
int index = 8 + 8*linesize + y*linesize;
memcpy(p->src + index*sample_bytes, src + y*src_linesize, width*sample_bytes);
if (sample_bytes == 1) {
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];
}
} else {
for (x = 0; x < 8; x++) {
psrc16[index - x - 1] = psrc16[index + x ];
psrc16[index + width + x ] = psrc16[index + width - x - 1];
}
}
}
for (y = 0; y < 8; y++) {
memcpy(p->src + ( 7-y)*linesize * sample_bytes, p->src + ( y+8)*linesize * sample_bytes, linesize * sample_bytes);
memcpy(p->src + (height+8+y)*linesize * sample_bytes, p->src + (height-y+7)*linesize * sample_bytes, linesize * sample_bytes);
}
for (y = 0; y < height + 8; y += 8) {
memset(p->temp + (8 + y) * linesize, 0, 8 * linesize * sizeof(*p->temp));
for (x = 0; x < width + 8; x += 8) {
int qp;
if (p->qp) {
qp = p->qp;
} else{
const int qps = 3 + is_luma;
qp = qp_table[(FFMIN(x, width - 1) >> qps) + (FFMIN(y, height - 1) >> qps) * qp_stride];
qp = FFMAX(1, ff_norm_qscale(qp, p->qscale_type));
}
for (i = 0; i < count; i++) {
const int x1 = x + offset[i + count - 1][0];
const int y1 = y + offset[i + count - 1][1];
const int index = x1 + y1*linesize;
p->dct->get_pixels(block, p->src + sample_bytes*index, sample_bytes*linesize);
p->dct->fdct(block);
p->requantize(block2, block, qp, p->dct->idct_permutation);
p->dct->idct(block2);
add_block(p->temp + index, linesize, block2);
}
}
if (y) {
if (sample_bytes == 1) {
p->store_slice(dst + (y - 8) * dst_linesize, p->temp + 8 + y*linesize,
dst_linesize, linesize, width,
FFMIN(8, height + 8 - y), MAX_LEVEL - p->log2_count,
ldither);
} else {
store_slice16_c((uint16_t*)(dst + (y - 8) * dst_linesize), p->temp + 8 + y*linesize,
dst_linesize/2, linesize, width,
FFMIN(8, height + 8 - y), MAX_LEVEL - p->log2_count,
ldither, depth);
}
}
}
}
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_YUV444P10, AV_PIX_FMT_YUV422P10,
AV_PIX_FMT_YUV420P10,
AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV422P9,
AV_PIX_FMT_YUV420P9,
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_GBRP,
AV_PIX_FMT_GBRP9,
AV_PIX_FMT_GBRP10,
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)
{
SPPContext *s = inlink->dst->priv;
const int h = FFALIGN(inlink->h + 16, 16);
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const int bps = desc->comp[0].depth;
av_opt_set_int(s->dct, "bits_per_sample", bps, 0);
avcodec_dct_init(s->dct);
if (ARCH_X86)
ff_spp_init_x86(s);
s->hsub = desc->log2_chroma_w;
s->vsub = desc->log2_chroma_h;
s->temp_linesize = FFALIGN(inlink->w + 16, 16);
s->temp = av_malloc_array(s->temp_linesize, h * sizeof(*s->temp));
s->src = av_malloc_array(s->temp_linesize, h * sizeof(*s->src) * 2);
if (!s->temp || !s->src)
return AVERROR(ENOMEM);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
SPPContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out = in;
int qp_stride = 0;
const int8_t *qp_table = NULL;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const int depth = desc->comp[0].depth;
/* if we are not in a constant user quantizer mode and we don't want to use
* the quantizers from the B-frames (B-frames often have a higher QP), we
* need to save the qp table from the last non B-frame; this is what the
* following code block does */
if (!s->qp) {
qp_table = av_frame_get_qp_table(in, &qp_stride, &s->qscale_type);
if (qp_table && !s->use_bframe_qp && in->pict_type != AV_PICTURE_TYPE_B) {
int w, h;
/* if the qp stride is not set, it means the QP are only defined on
* a line basis */
if (!qp_stride) {
w = AV_CEIL_RSHIFT(inlink->w, 4);
h = 1;
} else {
w = qp_stride;
h = AV_CEIL_RSHIFT(inlink->h, 4);
}
if (w * h > s->non_b_qp_alloc_size) {
int ret = av_reallocp_array(&s->non_b_qp_table, w, h);
if (ret < 0) {
s->non_b_qp_alloc_size = 0;
return ret;
}
s->non_b_qp_alloc_size = w * h;
}
av_assert0(w * h <= s->non_b_qp_alloc_size);
memcpy(s->non_b_qp_table, qp_table, w * h);
}
}
if (s->log2_count && !ctx->is_disabled) {
if (!s->use_bframe_qp && s->non_b_qp_table)
qp_table = s->non_b_qp_table;
if (qp_table || s->qp) {
const int cw = AV_CEIL_RSHIFT(inlink->w, s->hsub);
const int ch = AV_CEIL_RSHIFT(inlink->h, s->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;
}
filter(s, out->data[0], in->data[0], out->linesize[0], in->linesize[0], inlink->w, inlink->h, qp_table, qp_stride, 1, depth);
if (out->data[2]) {
filter(s, out->data[1], in->data[1], out->linesize[1], in->linesize[1], cw, ch, qp_table, qp_stride, 0, depth);
filter(s, out->data[2], in->data[2], out->linesize[2], in->linesize[2], cw, ch, qp_table, qp_stride, 0, depth);
}
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 int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
SPPContext *s = ctx->priv;
if (!strcmp(cmd, "level")) {
if (!strcmp(args, "max"))
s->log2_count = MAX_LEVEL;
else
s->log2_count = av_clip(strtol(args, NULL, 10), 0, MAX_LEVEL);
return 0;
}
return AVERROR(ENOSYS);
}
static av_cold int init_dict(AVFilterContext *ctx, AVDictionary **opts)
{
SPPContext *s = ctx->priv;
int ret;
s->avctx = avcodec_alloc_context3(NULL);
s->dct = avcodec_dct_alloc();
if (!s->avctx || !s->dct)
return AVERROR(ENOMEM);
if (opts) {
AVDictionaryEntry *e = NULL;
while ((e = av_dict_get(*opts, "", e, AV_DICT_IGNORE_SUFFIX))) {
if ((ret = av_opt_set(s->dct, e->key, e->value, 0)) < 0)
return ret;
}
av_dict_free(opts);
}
s->store_slice = store_slice_c;
switch (s->mode) {
case MODE_HARD: s->requantize = hardthresh_c; break;
case MODE_SOFT: s->requantize = softthresh_c; break;
}
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SPPContext *s = ctx->priv;
av_freep(&s->temp);
av_freep(&s->src);
if (s->avctx) {
avcodec_close(s->avctx);
av_freep(&s->avctx);
}
av_freep(&s->dct);
av_freep(&s->non_b_qp_table);
}
static const AVFilterPad spp_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad spp_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_spp = {
.name = "spp",
.description = NULL_IF_CONFIG_SMALL("Apply a simple post processing filter."),
.priv_size = sizeof(SPPContext),
.init_dict = init_dict,
.uninit = uninit,
.query_formats = query_formats,
.inputs = spp_inputs,
.outputs = spp_outputs,
.process_command = process_command,
.priv_class = &spp_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};