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FFmpeg/libavfilter/vf_extractplanes.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) 2013 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*/
#include "libavutil/avstring.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
#include "filters.h"
#include "internal.h"
#define PLANE_R 0x01
#define PLANE_G 0x02
#define PLANE_B 0x04
#define PLANE_A 0x08
#define PLANE_Y 0x10
#define PLANE_U 0x20
#define PLANE_V 0x40
typedef struct ExtractPlanesContext {
const AVClass *class;
int requested_planes;
int map[4];
int linesize[4];
int is_packed;
int depth;
int step;
} ExtractPlanesContext;
#define OFFSET(x) offsetof(ExtractPlanesContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption extractplanes_options[] = {
{ "planes", "set planes", OFFSET(requested_planes), AV_OPT_TYPE_FLAGS, {.i64=1}, 1, 0xff, FLAGS, "flags"},
{ "y", "set luma plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_Y}, 0, 0, FLAGS, "flags"},
{ "u", "set u plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_U}, 0, 0, FLAGS, "flags"},
{ "v", "set v plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_V}, 0, 0, FLAGS, "flags"},
{ "r", "set red plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_R}, 0, 0, FLAGS, "flags"},
{ "g", "set green plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_G}, 0, 0, FLAGS, "flags"},
{ "b", "set blue plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_B}, 0, 0, FLAGS, "flags"},
{ "a", "set alpha plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_A}, 0, 0, FLAGS, "flags"},
{ NULL }
};
AVFILTER_DEFINE_CLASS(extractplanes);
#define EIGHTBIT_FORMATS \
AV_PIX_FMT_YUV410P, \
AV_PIX_FMT_YUV411P, \
AV_PIX_FMT_YUV440P, \
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P, \
AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA422P, \
AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, \
AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P, \
AV_PIX_FMT_YUVJ411P, \
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, \
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A, \
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, \
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, \
AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, \
AV_PIX_FMT_RGB0, AV_PIX_FMT_BGR0, \
AV_PIX_FMT_0RGB, AV_PIX_FMT_0BGR, \
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP
#define HIGHDEPTH_FORMATS(suf) \
AV_PIX_FMT_YA16##suf, AV_PIX_FMT_GRAY16##suf, \
AV_PIX_FMT_YUV420P16##suf, AV_PIX_FMT_YUVA420P16##suf, \
AV_PIX_FMT_YUV422P16##suf, AV_PIX_FMT_YUVA422P16##suf, \
AV_PIX_FMT_YUV444P16##suf, AV_PIX_FMT_YUVA444P16##suf, \
AV_PIX_FMT_RGB48##suf, AV_PIX_FMT_BGR48##suf, \
AV_PIX_FMT_RGBA64##suf, AV_PIX_FMT_BGRA64##suf, \
AV_PIX_FMT_GBRP16##suf, AV_PIX_FMT_GBRAP16##suf, \
AV_PIX_FMT_YUV420P10##suf, \
AV_PIX_FMT_YUV422P10##suf, \
AV_PIX_FMT_YUV444P10##suf, \
AV_PIX_FMT_YUV440P10##suf, \
AV_PIX_FMT_YUVA420P10##suf, \
AV_PIX_FMT_YUVA422P10##suf, \
AV_PIX_FMT_YUVA444P10##suf, \
AV_PIX_FMT_YUV420P12##suf, \
AV_PIX_FMT_YUV422P12##suf, \
AV_PIX_FMT_YUV444P12##suf, \
AV_PIX_FMT_YUV440P12##suf, \
AV_PIX_FMT_YUVA422P12##suf, \
AV_PIX_FMT_YUVA444P12##suf, \
AV_PIX_FMT_GBRP10##suf, AV_PIX_FMT_GBRAP10##suf, \
AV_PIX_FMT_GBRP12##suf, AV_PIX_FMT_GBRAP12##suf, \
AV_PIX_FMT_YUV420P9##suf, \
AV_PIX_FMT_YUV422P9##suf, \
AV_PIX_FMT_YUV444P9##suf, \
AV_PIX_FMT_YUVA420P9##suf, \
AV_PIX_FMT_YUVA422P9##suf, \
AV_PIX_FMT_YUVA444P9##suf, \
AV_PIX_FMT_GBRP9##suf, \
AV_PIX_FMT_GBRP14##suf, \
AV_PIX_FMT_YUV420P14##suf, \
AV_PIX_FMT_YUV422P14##suf, \
AV_PIX_FMT_YUV444P14##suf
#define FLOAT_FORMATS(suf) \
AV_PIX_FMT_GRAYF32##suf, \
AV_PIX_FMT_GBRPF32##suf, AV_PIX_FMT_GBRAPF32##suf \
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat in_pixfmts_le[] = {
EIGHTBIT_FORMATS,
HIGHDEPTH_FORMATS(LE),
FLOAT_FORMATS(LE),
AV_PIX_FMT_NONE,
};
static const enum AVPixelFormat in_pixfmts_be[] = {
EIGHTBIT_FORMATS,
HIGHDEPTH_FORMATS(BE),
FLOAT_FORMATS(BE),
AV_PIX_FMT_NONE,
};
static const enum AVPixelFormat out8_pixfmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out9le_pixfmts[] = { AV_PIX_FMT_GRAY9LE, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out9be_pixfmts[] = { AV_PIX_FMT_GRAY9BE, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out10le_pixfmts[] = { AV_PIX_FMT_GRAY10LE, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out10be_pixfmts[] = { AV_PIX_FMT_GRAY10BE, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out12le_pixfmts[] = { AV_PIX_FMT_GRAY12LE, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out12be_pixfmts[] = { AV_PIX_FMT_GRAY12BE, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out14le_pixfmts[] = { AV_PIX_FMT_GRAY14LE, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out14be_pixfmts[] = { AV_PIX_FMT_GRAY14BE, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out16le_pixfmts[] = { AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out16be_pixfmts[] = { AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out32le_pixfmts[] = { AV_PIX_FMT_GRAYF32LE, AV_PIX_FMT_NONE };
static const enum AVPixelFormat out32be_pixfmts[] = { AV_PIX_FMT_GRAYF32BE, AV_PIX_FMT_NONE };
const enum AVPixelFormat *out_pixfmts, *in_pixfmts;
const AVPixFmtDescriptor *desc;
AVFilterFormats *avff;
int i, ret, depth = 0, be = 0;
if (!ctx->inputs[0]->incfg.formats ||
!ctx->inputs[0]->incfg.formats->nb_formats) {
return AVERROR(EAGAIN);
}
avff = ctx->inputs[0]->incfg.formats;
desc = av_pix_fmt_desc_get(avff->formats[0]);
depth = desc->comp[0].depth;
be = desc->flags & AV_PIX_FMT_FLAG_BE;
if (be) {
in_pixfmts = in_pixfmts_be;
} else {
in_pixfmts = in_pixfmts_le;
}
if (!ctx->inputs[0]->outcfg.formats)
if ((ret = ff_formats_ref(ff_make_format_list(in_pixfmts), &ctx->inputs[0]->outcfg.formats)) < 0)
return ret;
for (i = 1; i < avff->nb_formats; i++) {
desc = av_pix_fmt_desc_get(avff->formats[i]);
if (depth != desc->comp[0].depth ||
be != (desc->flags & AV_PIX_FMT_FLAG_BE)) {
return AVERROR(EAGAIN);
}
}
if (depth == 8)
out_pixfmts = out8_pixfmts;
else if (!be && depth == 9)
out_pixfmts = out9le_pixfmts;
else if (be && depth == 9)
out_pixfmts = out9be_pixfmts;
else if (!be && depth == 10)
out_pixfmts = out10le_pixfmts;
else if (be && depth == 10)
out_pixfmts = out10be_pixfmts;
else if (!be && depth == 12)
out_pixfmts = out12le_pixfmts;
else if (be && depth == 12)
out_pixfmts = out12be_pixfmts;
else if (!be && depth == 14)
out_pixfmts = out14le_pixfmts;
else if (be && depth == 14)
out_pixfmts = out14be_pixfmts;
else if (be && depth == 16)
out_pixfmts = out16be_pixfmts;
else if (!be && depth == 16)
out_pixfmts = out16le_pixfmts;
else if (be && depth == 32)
out_pixfmts = out32be_pixfmts;
else
out_pixfmts = out32le_pixfmts;
for (i = 0; i < ctx->nb_outputs; i++)
if ((ret = ff_formats_ref(ff_make_format_list(out_pixfmts), &ctx->outputs[i]->incfg.formats)) < 0)
return ret;
return 0;
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
ExtractPlanesContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int plane_avail, ret, i;
uint8_t rgba_map[4];
plane_avail = ((desc->flags & AV_PIX_FMT_FLAG_RGB) ? PLANE_R|PLANE_G|PLANE_B :
PLANE_Y |
((desc->nb_components > 2) ? PLANE_U|PLANE_V : 0)) |
((desc->flags & AV_PIX_FMT_FLAG_ALPHA) ? PLANE_A : 0);
if (s->requested_planes & ~plane_avail) {
av_log(ctx, AV_LOG_ERROR, "Requested planes not available.\n");
return AVERROR(EINVAL);
}
if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
return ret;
s->depth = desc->comp[0].depth >> 3;
s->step = av_get_padded_bits_per_pixel(desc) >> 3;
s->is_packed = !(desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
(desc->nb_components > 1);
if (desc->flags & AV_PIX_FMT_FLAG_RGB) {
ff_fill_rgba_map(rgba_map, inlink->format);
for (i = 0; i < 4; i++)
s->map[i] = rgba_map[s->map[i]];
}
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
ExtractPlanesContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const int output = outlink->srcpad - ctx->output_pads;
if (s->map[output] == 1 || s->map[output] == 2) {
outlink->h = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
outlink->w = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
}
return 0;
}
static void extract_from_packed(uint8_t *dst, int dst_linesize,
const uint8_t *src, int src_linesize,
int width, int height,
int depth, int step, int comp)
{
int x, y;
for (y = 0; y < height; y++) {
switch (depth) {
case 1:
for (x = 0; x < width; x++)
dst[x] = src[x * step + comp];
break;
case 2:
for (x = 0; x < width; x++) {
dst[x * 2 ] = src[x * step + comp * 2 ];
dst[x * 2 + 1] = src[x * step + comp * 2 + 1];
}
break;
}
dst += dst_linesize;
src += src_linesize;
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
ExtractPlanesContext *s = ctx->priv;
int i, eof = 0, ret = 0;
for (i = 0; i < ctx->nb_outputs; i++) {
AVFilterLink *outlink = ctx->outputs[i];
const int idx = s->map[i];
AVFrame *out;
if (ff_outlink_get_status(outlink))
continue;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
ret = AVERROR(ENOMEM);
break;
}
av_frame_copy_props(out, frame);
if (s->is_packed) {
extract_from_packed(out->data[0], out->linesize[0],
frame->data[0], frame->linesize[0],
outlink->w, outlink->h,
s->depth,
s->step, idx);
} else {
av_image_copy_plane(out->data[0], out->linesize[0],
frame->data[idx], frame->linesize[idx],
s->linesize[idx], outlink->h);
}
ret = ff_filter_frame(outlink, out);
if (ret == AVERROR_EOF)
eof++;
else if (ret < 0)
break;
}
av_frame_free(&frame);
if (eof == ctx->nb_outputs)
ret = AVERROR_EOF;
else if (ret == AVERROR_EOF)
ret = 0;
return ret;
}
static av_cold int init(AVFilterContext *ctx)
{
ExtractPlanesContext *s = ctx->priv;
int planes = (s->requested_planes & 0xf) | (s->requested_planes >> 4);
int i, ret;
for (i = 0; i < 4; i++) {
char *name;
AVFilterPad pad = { 0 };
if (!(planes & (1 << i)))
continue;
name = av_asprintf("out%d", ctx->nb_outputs);
if (!name)
return AVERROR(ENOMEM);
s->map[ctx->nb_outputs] = i;
pad.name = name;
pad.type = AVMEDIA_TYPE_VIDEO;
pad.config_props = config_output;
if ((ret = ff_append_outpad_free_name(ctx, &pad)) < 0)
return ret;
}
return 0;
}
static const AVFilterPad extractplanes_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
const AVFilter ff_vf_extractplanes = {
.name = "extractplanes",
.description = NULL_IF_CONFIG_SMALL("Extract planes as grayscale frames."),
.priv_size = sizeof(ExtractPlanesContext),
.priv_class = &extractplanes_class,
.init = init,
FILTER_INPUTS(extractplanes_inputs),
.outputs = NULL,
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
};
#if CONFIG_ALPHAEXTRACT_FILTER
static av_cold int init_alphaextract(AVFilterContext *ctx)
{
ExtractPlanesContext *s = ctx->priv;
s->requested_planes = PLANE_A;
s->map[0] = 3;
return 0;
}
static const AVFilterPad alphaextract_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
const AVFilter ff_vf_alphaextract = {
.name = "alphaextract",
.description = NULL_IF_CONFIG_SMALL("Extract an alpha channel as a "
"grayscale image component."),
.priv_size = sizeof(ExtractPlanesContext),
.init = init_alphaextract,
FILTER_INPUTS(extractplanes_inputs),
FILTER_OUTPUTS(alphaextract_outputs),
FILTER_QUERY_FUNC(query_formats),
};
#endif /* CONFIG_ALPHAEXTRACT_FILTER */
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