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unsharp.c
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unsharp.c
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/* unsharp.c
Copyright (c) 2002 Rémi Guyomarch <rguyom at pobox.com>
Copyright (c) 2003-2024 HandBrake Team
This file is part of the HandBrake source code
Homepage: <http://handbrake.fr/>.
It may be used under the terms of the GNU General Public License v2.
For full terms see the file COPYING file or visit http://www.gnu.org/licenses/gpl-2.0.html
*/
#include "handbrake/handbrake.h"
#define UNSHARP_STRENGTH_LUMA_DEFAULT 0.25
#define UNSHARP_SIZE_LUMA_DEFAULT 7
#define UNSHARP_STRENGTH_CHROMA_DEFAULT 0.25
#define UNSHARP_SIZE_CHROMA_DEFAULT 7
#define UNSHARP_SIZE_MIN 3
#define UNSHARP_SIZE_MAX 15
typedef struct
{
int pix_fmt; // source pixel format
int bps;
int max_value;
int width; // source video width
double strength; // strength
int size; // pixel context region width (must be odd)
int steps;
int amount;
int scalebits;
int32_t halfscale;
} unsharp_plane_context_t;
typedef struct
{
uint32_t * SC[UNSHARP_SIZE_MAX - 1];
} unsharp_thread_context_t;
typedef unsharp_thread_context_t unsharp_thread_context3_t[3];
struct hb_filter_private_s
{
int depth;
unsharp_plane_context_t plane_ctx[3];
unsharp_thread_context3_t * thread_ctx;
int threads;
hb_filter_init_t input;
hb_filter_init_t output;
};
static int unsharp_init(hb_filter_object_t *filter,
hb_filter_init_t *init);
static int unsharp_init_thread(hb_filter_object_t *filter, int threads);
static int unsharp_work(hb_filter_object_t *filter,
hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out);
static int unsharp_work_thread(hb_filter_object_t *filter,
hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out, int thread);
static void unsharp_close(hb_filter_object_t *filter);
static const char unsharp_template[] =
"y-strength=^"HB_FLOAT_REG"$:y-size=^"HB_INT_REG"$:"
"cb-strength=^"HB_FLOAT_REG"$:cb-size=^"HB_INT_REG"$:"
"cr-strength=^"HB_FLOAT_REG"$:cr-size=^"HB_INT_REG"$";
hb_filter_object_t hb_filter_unsharp =
{
.id = HB_FILTER_UNSHARP,
.enforce_order = 1,
.name = "Sharpen (unsharp)",
.settings = NULL,
.init = unsharp_init,
.init_thread = unsharp_init_thread,
.work = unsharp_work,
.work_thread = unsharp_work_thread,
.close = unsharp_close,
.settings_template = unsharp_template,
};
#define DEF_UNSHARP_FUNC(name, nbits) \
static void name##_##nbits(const uint8_t *frame_src, \
uint8_t *frame_dst, \
const int width, \
const int height, \
int stride_src, \
int stride_dst, \
unsharp_plane_context_t *ctx, \
unsharp_thread_context_t *tctx) \
{ \
uint32_t **SC = tctx->SC; \
uint32_t SR[UNSHARP_SIZE_MAX - 1]; \
const uint##nbits##_t *src = (const uint##nbits##_t *)frame_src; \
uint##nbits##_t *dst = (uint##nbits##_t *)frame_dst; \
const uint##nbits##_t *src2 = (const uint##nbits##_t *)frame_src; \
const int amount = ctx->amount; \
const int steps = ctx->steps; \
const int scalebits = ctx->scalebits; \
const int32_t halfscale = ctx->halfscale; \
const int16_t max_value = ctx->max_value; \
\
int32_t res; \
int x, y, z; \
uint32_t Tmp1, Tmp2; \
\
if (!amount) \
{ \
if (src != dst) \
{ \
if (stride_src == stride_dst) \
{ \
memcpy(dst, src, stride_dst * height); \
} \
else \
{ \
const int size = stride_src < stride_dst ? ABS(stride_src) : stride_dst; \
for (int yy = 0; yy < height; yy++) \
{ \
memcpy(dst, src, size); \
dst += stride_dst; \
src += stride_src; \
} \
} \
} \
\
return; \
} \
\
for (y = 0; y < 2 * steps; y++) \
{ \
memset(SC[y], 0, sizeof(SC[y][0]) * (width + 2 * steps)); \
} \
\
stride_src /= ctx->bps; \
stride_dst /= ctx->bps; \
\
for (y = -steps; y < height + steps; y++) \
{ \
if (y < height) \
{ \
src2 = src; \
} \
\
memset(SR, 0, sizeof(SR[0]) * (2 * steps)); \
\
for (x = -steps; x < width + steps; x++) \
{ \
Tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width - 1] : src2[x]; \
\
for (z = 0; z < steps * 2; z += 2) \
{ \
Tmp2 = SR[z + 0] + Tmp1; SR[z + 0] = Tmp1; \
Tmp1 = SR[z + 1] + Tmp2; SR[z + 1] = Tmp2; \
} \
\
for (z = 0; z < steps * 2; z += 2) \
{ \
Tmp2 = SC[z + 0][x + steps] + Tmp1; SC[z + 0][x + steps] = Tmp1; \
Tmp1 = SC[z + 1][x + steps] + Tmp2; SC[z + 1][x + steps] = Tmp2; \
} \
\
if (x >= steps && y >= steps) \
{ \
const uint##nbits##_t *srx = src - steps * stride_src + x - steps; \
uint##nbits##_t *dsx = dst - steps * stride_dst + x - steps; \
\
res = (int32_t)*srx + ((((int32_t)*srx - \
(int32_t)((Tmp1 + halfscale) >> scalebits)) * amount) >> 16); \
*dsx = res > max_value ? max_value : res < 0 ? 0 : (uint##nbits##_t)res; \
} \
} \
\
if (y >= 0) \
{ \
dst += stride_dst; \
src += stride_src; \
} \
} \
} \
DEF_UNSHARP_FUNC(unsharp, 16)
DEF_UNSHARP_FUNC(unsharp, 8)
#define unsharp(...) \
switch (pv->depth) \
{ \
case 8: unsharp_8(__VA_ARGS__); break; \
default: unsharp_16(__VA_ARGS__); break; \
} \
static int unsharp_init(hb_filter_object_t *filter,
hb_filter_init_t *init)
{
filter->private_data = calloc(sizeof(struct hb_filter_private_s), 1);
if (filter->private_data == NULL)
{
hb_error("Unsharp calloc failed");
return -1;
}
hb_filter_private_t * pv = filter->private_data;
pv->input = *init;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(init->pix_fmt);
pv->depth = desc->comp[0].depth;
// Mark parameters unset
for (int c = 0; c < 3; c++)
{
pv->plane_ctx[c].strength = -1;
pv->plane_ctx[c].size = -1;
}
// Read user parameters
if (filter->settings != NULL)
{
hb_dict_t * dict = filter->settings;
hb_dict_extract_double(&pv->plane_ctx[0].strength, dict, "y-strength");
hb_dict_extract_int(&pv->plane_ctx[0].size, dict, "y-size");
hb_dict_extract_double(&pv->plane_ctx[1].strength, dict, "cb-strength");
hb_dict_extract_int(&pv->plane_ctx[1].size, dict, "cb-size");
hb_dict_extract_double(&pv->plane_ctx[2].strength, dict, "cr-strength");
hb_dict_extract_int(&pv->plane_ctx[2].size, dict, "cr-size");
}
// Cascade values
// Cr not set; inherit Cb. Cb not set; inherit Y. Y not set; defaults.
for (int c = 1; c < 3; c++)
{
unsharp_plane_context_t * prev_ctx = &pv->plane_ctx[c - 1];
unsharp_plane_context_t * ctx = &pv->plane_ctx[c];
if (ctx->strength == -1) ctx->strength = prev_ctx->strength;
if (ctx->size == -1) ctx->size = prev_ctx->size;
}
for (int c = 0; c < 3; c++)
{
unsharp_plane_context_t * ctx = &pv->plane_ctx[c];
ctx->width = init->geometry.width;
ctx->pix_fmt = init->pix_fmt;
ctx->bps = pv->depth > 8 ? 2 : 1;
ctx->max_value = (1 << pv->depth) - 1;
// Replace unset values with defaults
if (ctx->strength == -1)
{
ctx->strength = c ? UNSHARP_STRENGTH_CHROMA_DEFAULT :
UNSHARP_STRENGTH_LUMA_DEFAULT;
}
if (ctx->size == -1)
{
ctx->size = c ? UNSHARP_SIZE_CHROMA_DEFAULT :
UNSHARP_SIZE_LUMA_DEFAULT;
}
// Sanitize
if (ctx->strength < 0) ctx->strength = 0;
if (ctx->strength > 1.5) ctx->strength = 1.5;
if (ctx->size % 2 == 0) ctx->size--;
if (ctx->size < UNSHARP_SIZE_MIN) ctx->size = UNSHARP_SIZE_MIN;
if (ctx->size > UNSHARP_SIZE_MAX) ctx->size = UNSHARP_SIZE_MAX;
ctx->amount = ctx->strength * 65536.0;
ctx->steps = ctx->size / 2;
ctx->scalebits = ctx->steps * 4;
ctx->halfscale = 1 << (ctx->scalebits - 1);
}
if (unsharp_init_thread(filter, 1) < 0)
{
unsharp_close(filter);
return -1;
}
pv->output = *init;
return 0;
}
static void unsharp_thread_close(hb_filter_private_t *pv)
{
int c, z;
for (c = 0; c < 3; c++)
{
unsharp_plane_context_t * ctx = &pv->plane_ctx[c];
for (int t = 0; t < pv->threads; t++)
{
unsharp_thread_context_t * tctx = &pv->thread_ctx[t][c];
for (z = 0; z < 2 * ctx->steps; z++)
{
free(tctx->SC[z]);
tctx->SC[z] = NULL;
}
}
}
free(pv->thread_ctx);
}
static int unsharp_init_thread(hb_filter_object_t *filter, int threads)
{
hb_filter_private_t * pv = filter->private_data;
unsharp_thread_close(pv);
pv->thread_ctx = calloc(threads, sizeof(unsharp_thread_context3_t));
if (pv->thread_ctx == NULL)
{
hb_error("Unsharp calloc failed");
return -1;
}
pv->threads = threads;
for (int c = 0; c < 3; c++)
{
unsharp_plane_context_t * ctx = &pv->plane_ctx[c];
int w = hb_image_width(ctx->pix_fmt, ctx->width, c);
for (int t = 0; t < threads; t++)
{
unsharp_thread_context_t * tctx = &pv->thread_ctx[t][c];
int z;
for (z = 0; z < 2 * ctx->steps; z++)
{
tctx->SC[z] = malloc(sizeof(*(tctx->SC[z])) *
(w + 2 * ctx->steps));
if (tctx->SC[z] == NULL)
{
hb_error("Unsharp calloc failed");
return -1;
}
}
}
}
return 0;
}
static void unsharp_close(hb_filter_object_t * filter)
{
hb_filter_private_t *pv = filter->private_data;
if (pv == NULL)
{
return;
}
unsharp_thread_close(pv);
free(pv);
filter->private_data = NULL;
}
static int unsharp_work_thread(hb_filter_object_t *filter,
hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out, int thread)
{
hb_filter_private_t *pv = filter->private_data;
hb_buffer_t *in = *buf_in, *out;
if (in->s.flags & HB_BUF_FLAG_EOF)
{
*buf_out = in;
*buf_in = NULL;
return HB_FILTER_DONE;
}
out = hb_frame_buffer_init(pv->output.pix_fmt, in->f.width, in->f.height);
out->f.color_prim = pv->output.color_prim;
out->f.color_transfer = pv->output.color_transfer;
out->f.color_matrix = pv->output.color_matrix;
out->f.color_range = pv->output.color_range;
out->f.chroma_location = pv->output.chroma_location;
int c;
for (c = 0; c < 3; c++)
{
unsharp_plane_context_t * ctx = &pv->plane_ctx[c];
unsharp_thread_context_t * tctx = &pv->thread_ctx[thread][c];
unsharp(in->plane[c].data,
out->plane[c].data,
in->plane[c].width,
in->plane[c].height,
in->plane[c].stride,
out->plane[c].stride,
ctx, tctx);
}
hb_buffer_copy_props(out, in);
*buf_out = out;
return HB_FILTER_OK;
}
static int unsharp_work(hb_filter_object_t *filter,
hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out)
{
return unsharp_work_thread(filter, buf_in, buf_out, 0);
}