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FFmpeg/libavfilter/vf_mix.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

443 lines
13 KiB
C

/*
* Copyright (c) 2017 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/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "framesync.h"
#include "video.h"
typedef struct MixContext {
const AVClass *class;
const AVPixFmtDescriptor *desc;
char *weights_str;
int nb_inputs;
int duration;
float *weights;
float scale;
float wfactor;
int tmix;
int nb_frames;
int depth;
int max;
int nb_planes;
int linesize[4];
int height[4];
AVFrame **frames;
FFFrameSync fs;
} MixContext;
static int query_formats(AVFilterContext *ctx)
{
int reject_flags = AV_PIX_FMT_FLAG_BITSTREAM |
AV_PIX_FMT_FLAG_HWACCEL |
AV_PIX_FMT_FLAG_PAL;
return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0, reject_flags));
}
static int parse_weights(AVFilterContext *ctx)
{
MixContext *s = ctx->priv;
char *p, *arg, *saveptr = NULL;
int i, last = 0;
s->wfactor = 0.f;
p = s->weights_str;
for (i = 0; i < s->nb_inputs; i++) {
if (!(arg = av_strtok(p, " |", &saveptr)))
break;
p = NULL;
if (av_sscanf(arg, "%f", &s->weights[i]) != 1) {
av_log(ctx, AV_LOG_ERROR, "Invalid syntax for weights[%d].\n", i);
return AVERROR(EINVAL);
}
s->wfactor += s->weights[i];
last = i;
}
for (; i < s->nb_inputs; i++) {
s->weights[i] = s->weights[last];
s->wfactor += s->weights[i];
}
if (s->scale == 0) {
s->wfactor = 1 / s->wfactor;
} else {
s->wfactor = s->scale;
}
return 0;
}
static av_cold int init(AVFilterContext *ctx)
{
MixContext *s = ctx->priv;
int ret;
s->tmix = !strcmp(ctx->filter->name, "tmix");
s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
if (!s->frames)
return AVERROR(ENOMEM);
s->weights = av_calloc(s->nb_inputs, sizeof(*s->weights));
if (!s->weights)
return AVERROR(ENOMEM);
if (!s->tmix) {
for (int i = 0; i < s->nb_inputs; i++) {
AVFilterPad pad = { 0 };
pad.type = AVMEDIA_TYPE_VIDEO;
pad.name = av_asprintf("input%d", i);
if (!pad.name)
return AVERROR(ENOMEM);
if ((ret = ff_append_inpad_free_name(ctx, &pad)) < 0)
return ret;
}
}
return parse_weights(ctx);
}
typedef struct ThreadData {
AVFrame **in, *out;
} ThreadData;
static int mix_frames(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
MixContext *s = ctx->priv;
ThreadData *td = arg;
AVFrame **in = td->in;
AVFrame *out = td->out;
int i, p, x, y;
if (s->depth <= 8) {
for (p = 0; p < s->nb_planes; p++) {
const int slice_start = (s->height[p] * jobnr) / nb_jobs;
const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs;
uint8_t *dst = out->data[p] + slice_start * out->linesize[p];
for (y = slice_start; y < slice_end; y++) {
for (x = 0; x < s->linesize[p]; x++) {
int val = 0;
for (i = 0; i < s->nb_inputs; i++) {
uint8_t src = in[i]->data[p][y * in[i]->linesize[p] + x];
val += src * s->weights[i];
}
dst[x] = av_clip_uint8(val * s->wfactor);
}
dst += out->linesize[p];
}
}
} else {
for (p = 0; p < s->nb_planes; p++) {
const int slice_start = (s->height[p] * jobnr) / nb_jobs;
const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs;
uint16_t *dst = (uint16_t *)(out->data[p] + slice_start * out->linesize[p]);
for (y = slice_start; y < slice_end; y++) {
for (x = 0; x < s->linesize[p] / 2; x++) {
int val = 0;
for (i = 0; i < s->nb_inputs; i++) {
uint16_t src = AV_RN16(in[i]->data[p] + y * in[i]->linesize[p] + x * 2);
val += src * s->weights[i];
}
dst[x] = av_clip(val * s->wfactor, 0, s->max);
}
dst += out->linesize[p] / 2;
}
}
}
return 0;
}
static int process_frame(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
AVFilterLink *outlink = ctx->outputs[0];
MixContext *s = fs->opaque;
AVFrame **in = s->frames;
AVFrame *out;
ThreadData td;
int i, ret;
for (i = 0; i < s->nb_inputs; i++) {
if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
return ret;
}
if (ctx->is_disabled) {
out = av_frame_clone(s->frames[0]);
if (!out)
return AVERROR(ENOMEM);
out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
return ff_filter_frame(outlink, out);
}
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
td.in = in;
td.out = out;
ff_filter_execute(ctx, mix_frames, &td, NULL,
FFMIN(s->height[0], ff_filter_get_nb_threads(ctx)));
return ff_filter_frame(outlink, out);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
MixContext *s = ctx->priv;
AVRational frame_rate = ctx->inputs[0]->frame_rate;
AVRational sar = ctx->inputs[0]->sample_aspect_ratio;
AVFilterLink *inlink = ctx->inputs[0];
int height = ctx->inputs[0]->h;
int width = ctx->inputs[0]->w;
FFFrameSyncIn *in;
int i, ret;
if (!s->tmix) {
for (i = 1; i < s->nb_inputs; i++) {
if (ctx->inputs[i]->h != height || ctx->inputs[i]->w != width) {
av_log(ctx, AV_LOG_ERROR, "Input %d size (%dx%d) does not match input %d size (%dx%d).\n", i, ctx->inputs[i]->w, ctx->inputs[i]->h, 0, width, height);
return AVERROR(EINVAL);
}
}
}
s->desc = av_pix_fmt_desc_get(outlink->format);
if (!s->desc)
return AVERROR_BUG;
s->nb_planes = av_pix_fmt_count_planes(outlink->format);
s->depth = s->desc->comp[0].depth;
s->max = (1 << s->depth) - 1;
if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
return ret;
s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
s->height[0] = s->height[3] = inlink->h;
if (s->tmix)
return 0;
outlink->w = width;
outlink->h = height;
outlink->frame_rate = frame_rate;
outlink->sample_aspect_ratio = sar;
if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
return ret;
in = s->fs.in;
s->fs.opaque = s;
s->fs.on_event = process_frame;
for (i = 0; i < s->nb_inputs; i++) {
AVFilterLink *inlink = ctx->inputs[i];
in[i].time_base = inlink->time_base;
in[i].sync = 1;
in[i].before = EXT_STOP;
in[i].after = (s->duration == 1 || (s->duration == 2 && i == 0)) ? EXT_STOP : EXT_INFINITY;
}
ret = ff_framesync_configure(&s->fs);
outlink->time_base = s->fs.time_base;
return ret;
}
static av_cold void uninit(AVFilterContext *ctx)
{
MixContext *s = ctx->priv;
int i;
ff_framesync_uninit(&s->fs);
av_freep(&s->weights);
if (s->tmix) {
for (i = 0; i < s->nb_frames && s->frames; i++)
av_frame_free(&s->frames[i]);
}
av_freep(&s->frames);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
int ret;
ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
if (ret < 0)
return ret;
return parse_weights(ctx);
}
static int activate(AVFilterContext *ctx)
{
MixContext *s = ctx->priv;
return ff_framesync_activate(&s->fs);
}
#define OFFSET(x) offsetof(MixContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
#define TFLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption mix_options[] = {
{ "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT16_MAX, .flags = FLAGS },
{ "weights", "set weight for each input", OFFSET(weights_str), AV_OPT_TYPE_STRING, {.str="1 1"}, 0, 0, .flags = TFLAGS },
{ "scale", "set scale", OFFSET(scale), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, INT16_MAX, .flags = TFLAGS },
{ "duration", "how to determine end of stream", OFFSET(duration), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, .flags = FLAGS, "duration" },
{ "longest", "Duration of longest input", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "duration" },
{ "shortest", "Duration of shortest input", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "duration" },
{ "first", "Duration of first input", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "duration" },
{ NULL },
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
#if CONFIG_MIX_FILTER
AVFILTER_DEFINE_CLASS(mix);
const AVFilter ff_vf_mix = {
.name = "mix",
.description = NULL_IF_CONFIG_SMALL("Mix video inputs."),
.priv_size = sizeof(MixContext),
.priv_class = &mix_class,
FILTER_OUTPUTS(outputs),
FILTER_QUERY_FUNC(query_formats),
.init = init,
.uninit = uninit,
.activate = activate,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_SLICE_THREADS |
AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
.process_command = process_command,
};
#endif /* CONFIG_MIX_FILTER */
#if CONFIG_TMIX_FILTER
static int tmix_filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
MixContext *s = ctx->priv;
ThreadData td;
AVFrame *out;
if (s->nb_inputs == 1)
return ff_filter_frame(outlink, in);
if (s->nb_frames < s->nb_inputs) {
s->frames[s->nb_frames] = in;
s->nb_frames++;
if (s->nb_frames < s->nb_inputs)
return 0;
} else {
av_frame_free(&s->frames[0]);
memmove(&s->frames[0], &s->frames[1], sizeof(*s->frames) * (s->nb_inputs - 1));
s->frames[s->nb_inputs - 1] = in;
}
if (ctx->is_disabled) {
out = av_frame_clone(s->frames[0]);
if (!out)
return AVERROR(ENOMEM);
return ff_filter_frame(outlink, out);
}
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
out->pts = s->frames[0]->pts;
td.out = out;
td.in = s->frames;
ff_filter_execute(ctx, mix_frames, &td, NULL,
FFMIN(s->height[0], ff_filter_get_nb_threads(ctx)));
return ff_filter_frame(outlink, out);
}
static const AVOption tmix_options[] = {
{ "frames", "set number of successive frames to mix", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=3}, 1, 128, .flags = FLAGS },
{ "weights", "set weight for each frame", OFFSET(weights_str), AV_OPT_TYPE_STRING, {.str="1 1 1"}, 0, 0, .flags = TFLAGS },
{ "scale", "set scale", OFFSET(scale), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, INT16_MAX, .flags = TFLAGS },
{ NULL },
};
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = tmix_filter_frame,
},
};
AVFILTER_DEFINE_CLASS(tmix);
const AVFilter ff_vf_tmix = {
.name = "tmix",
.description = NULL_IF_CONFIG_SMALL("Mix successive video frames."),
.priv_size = sizeof(MixContext),
.priv_class = &tmix_class,
FILTER_OUTPUTS(outputs),
FILTER_INPUTS(inputs),
FILTER_QUERY_FUNC(query_formats),
.init = init,
.uninit = uninit,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
.process_command = process_command,
};
#endif /* CONFIG_TMIX_FILTER */