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b4f5201967
FFmpeg/libavfilter/vf_spp.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) 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/imgutils.h"
#include "libavutil/mem_internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "internal.h"
#include "qp_table.h"
#include "vf_spp.h"
enum mode {
MODE_HARD,
MODE_SOFT,
NB_MODES
};
static const AVClass *child_class_iterate(void **iter)
{
const AVClass *c = *iter ? NULL : avcodec_dct_get_class();
*iter = (void*)(uintptr_t)c;
return c;
}
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
#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption spp_options[] = {
{ "quality", "set quality", OFFSET(log2_count), AV_OPT_TYPE_INT, {.i64 = 3}, 0, MAX_LEVEL, TFLAGS },
{ "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_iterate = child_class_iterate,
.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[128][2] = {
{0,0}, // unused
{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++) {
dst[0 + y*linesize] += block[0 + y*8];
dst[1 + y*linesize] += block[1 + y*8];
dst[2 + y*linesize] += block[2 + y*8];
dst[3 + y*linesize] += block[3 + y*8];
dst[4 + y*linesize] += block[4 + y*8];
dst[5 + y*linesize] += block[5 + y*8];
dst[6 + y*linesize] += block[6 + y*8];
dst[7 + y*linesize] += block[7 + 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][0];
const int y1 = y + offset[i + count][1];
const int index = x1 + y1*linesize;
p->dct->get_pixels_unaligned(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
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
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;
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;
}
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;
int8_t *qp_table = NULL;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const int depth = desc->comp[0].depth;
int ret = 0;
/* 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 && (s->use_bframe_qp || in->pict_type != AV_PICTURE_TYPE_B)) {
ret = ff_qp_table_extract(in, &qp_table, &qp_stride, NULL, &s->qscale_type);
if (ret < 0) {
av_frame_free(&in);
return ret;
}
if (!s->use_bframe_qp && in->pict_type != AV_PICTURE_TYPE_B) {
av_freep(&s->non_b_qp_table);
s->non_b_qp_table = qp_table;
s->non_b_qp_stride = qp_stride;
}
}
if (s->log2_count && !ctx->is_disabled) {
if (!s->use_bframe_qp && s->non_b_qp_table) {
qp_table = s->non_b_qp_table;
qp_stride = s->non_b_qp_stride;
}
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);
ret = AVERROR(ENOMEM);
goto finish;
}
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);
}
ret = ff_filter_frame(outlink, out);
finish:
if (qp_table != s->non_b_qp_table)
av_freep(&qp_table);
return ret;
}
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") || !strcmp(cmd, "quality")) {
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 preinit(AVFilterContext *ctx)
{
SPPContext *s = ctx->priv;
s->dct = avcodec_dct_alloc();
if (!s->dct)
return AVERROR(ENOMEM);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SPPContext *s = ctx->priv;
av_freep(&s->temp);
av_freep(&s->src);
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,
},
};
static const AVFilterPad spp_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_spp = {
.name = "spp",
.description = NULL_IF_CONFIG_SMALL("Apply a simple post processing filter."),
.priv_size = sizeof(SPPContext),
.preinit = preinit,
.uninit = uninit,
FILTER_INPUTS(spp_inputs),
FILTER_OUTPUTS(spp_outputs),
FILTER_QUERY_FUNC(query_formats),
.process_command = process_command,
.priv_class = &spp_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};
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