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FFmpeg/libavfilter/f_streamselect.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

342 lines
9.9 KiB
C

/*
* 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/internal.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "audio.h"
#include "filters.h"
#include "formats.h"
#include "framesync.h"
#include "internal.h"
#include "video.h"
typedef struct StreamSelectContext {
const AVClass *class;
int nb_inputs;
char *map_str;
int *map;
int nb_map;
int is_audio;
int64_t *last_pts;
AVFrame **frames;
FFFrameSync fs;
} StreamSelectContext;
#define OFFSET(x) offsetof(StreamSelectContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
#define TFLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption streamselect_options[] = {
{ "inputs", "number of input streams", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags=FLAGS },
{ "map", "input indexes to remap to outputs", OFFSET(map_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags=TFLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS_EXT(streamselect, "(a)streamselect", streamselect_options);
static int process_frame(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
StreamSelectContext *s = fs->opaque;
AVFrame **in = s->frames;
int i, j, ret = 0, have_out = 0;
for (i = 0; i < ctx->nb_inputs; i++) {
if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
return ret;
}
for (j = 0; j < ctx->nb_inputs; j++) {
for (i = 0; i < s->nb_map; i++) {
if (s->map[i] == j) {
AVFrame *out;
if (s->is_audio && s->last_pts[j] == in[j]->pts &&
ctx->outputs[i]->frame_count_in > 0)
continue;
out = av_frame_clone(in[j]);
if (!out)
return AVERROR(ENOMEM);
out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, ctx->outputs[i]->time_base);
s->last_pts[j] = in[j]->pts;
ret = ff_filter_frame(ctx->outputs[i], out);
have_out = 1;
if (ret < 0)
return ret;
}
}
}
if (!have_out)
ff_filter_set_ready(ctx, 100);
return ret;
}
static int activate(AVFilterContext *ctx)
{
StreamSelectContext *s = ctx->priv;
return ff_framesync_activate(&s->fs);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
StreamSelectContext *s = ctx->priv;
const int outlink_idx = FF_OUTLINK_IDX(outlink);
const int inlink_idx = s->map[outlink_idx];
AVFilterLink *inlink = ctx->inputs[inlink_idx];
FFFrameSyncIn *in;
int i, ret;
av_log(ctx, AV_LOG_VERBOSE, "config output link %d "
"with settings from input link %d\n",
outlink_idx, inlink_idx);
switch (outlink->type) {
case AVMEDIA_TYPE_VIDEO:
outlink->w = inlink->w;
outlink->h = inlink->h;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
outlink->frame_rate = inlink->frame_rate;
break;
case AVMEDIA_TYPE_AUDIO:
outlink->sample_rate = inlink->sample_rate;
outlink->channels = inlink->channels;
outlink->channel_layout = inlink->channel_layout;
break;
}
outlink->time_base = inlink->time_base;
outlink->format = inlink->format;
if (s->fs.opaque == s)
return 0;
if ((ret = ff_framesync_init(&s->fs, ctx, ctx->nb_inputs)) < 0)
return ret;
in = s->fs.in;
s->fs.opaque = s;
s->fs.on_event = process_frame;
for (i = 0; i < ctx->nb_inputs; i++) {
in[i].time_base = ctx->inputs[i]->time_base;
in[i].sync = 1;
in[i].before = EXT_STOP;
in[i].after = EXT_STOP;
}
s->frames = av_calloc(ctx->nb_inputs, sizeof(*s->frames));
if (!s->frames)
return AVERROR(ENOMEM);
return ff_framesync_configure(&s->fs);
}
static int parse_definition(AVFilterContext *ctx, int nb_pads, int is_input, int is_audio)
{
const char *padtype = is_input ? "in" : "out";
int i = 0, ret = 0;
for (i = 0; i < nb_pads; i++) {
AVFilterPad pad = { 0 };
pad.type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
pad.name = av_asprintf("%sput%d", padtype, i);
if (!pad.name)
return AVERROR(ENOMEM);
av_log(ctx, AV_LOG_DEBUG, "Add %s pad %s\n", padtype, pad.name);
if (is_input) {
ret = ff_append_inpad_free_name(ctx, &pad);
} else {
pad.config_props = config_output;
ret = ff_append_outpad_free_name(ctx, &pad);
}
if (ret < 0)
return ret;
}
return 0;
}
static int parse_mapping(AVFilterContext *ctx, const char *map)
{
StreamSelectContext *s = ctx->priv;
int *new_map;
int new_nb_map = 0;
if (!map) {
av_log(ctx, AV_LOG_ERROR, "mapping definition is not set\n");
return AVERROR(EINVAL);
}
new_map = av_calloc(s->nb_inputs, sizeof(*new_map));
if (!new_map)
return AVERROR(ENOMEM);
while (1) {
char *p;
const int n = strtol(map, &p, 0);
av_log(ctx, AV_LOG_DEBUG, "n=%d map=%p p=%p\n", n, map, p);
if (map == p)
break;
map = p;
if (new_nb_map >= s->nb_inputs) {
av_log(ctx, AV_LOG_ERROR, "Unable to map more than the %d "
"input pads available\n", s->nb_inputs);
av_free(new_map);
return AVERROR(EINVAL);
}
if (n < 0 || n >= ctx->nb_inputs) {
av_log(ctx, AV_LOG_ERROR, "Input stream index %d doesn't exist "
"(there is only %d input streams defined)\n",
n, s->nb_inputs);
av_free(new_map);
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_VERBOSE, "Map input stream %d to output stream %d\n", n, new_nb_map);
new_map[new_nb_map++] = n;
}
if (!new_nb_map) {
av_log(ctx, AV_LOG_ERROR, "invalid mapping\n");
av_free(new_map);
return AVERROR(EINVAL);
}
av_freep(&s->map);
s->map = new_map;
s->nb_map = new_nb_map;
av_log(ctx, AV_LOG_VERBOSE, "%d map set\n", s->nb_map);
return 0;
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
if (!strcmp(cmd, "map")) {
int ret = parse_mapping(ctx, args);
if (ret < 0)
return ret;
return avfilter_config_links(ctx);
}
return AVERROR(ENOSYS);
}
static av_cold int init(AVFilterContext *ctx)
{
StreamSelectContext *s = ctx->priv;
int ret, nb_outputs = 0;
char *map = s->map_str;
if (!strcmp(ctx->filter->name, "astreamselect"))
s->is_audio = 1;
for (; map;) {
char *p;
strtol(map, &p, 0);
if (map == p)
break;
nb_outputs++;
map = p;
}
s->last_pts = av_calloc(s->nb_inputs, sizeof(*s->last_pts));
if (!s->last_pts)
return AVERROR(ENOMEM);
if ((ret = parse_definition(ctx, s->nb_inputs, 1, s->is_audio)) < 0 ||
(ret = parse_definition(ctx, nb_outputs, 0, s->is_audio)) < 0)
return ret;
av_log(ctx, AV_LOG_DEBUG, "Configured with %d inpad and %d outpad\n",
ctx->nb_inputs, ctx->nb_outputs);
return parse_mapping(ctx, s->map_str);
}
static av_cold void uninit(AVFilterContext *ctx)
{
StreamSelectContext *s = ctx->priv;
av_freep(&s->last_pts);
av_freep(&s->map);
av_freep(&s->frames);
ff_framesync_uninit(&s->fs);
}
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats;
int ret, i;
for (i = 0; i < ctx->nb_inputs; i++) {
formats = ff_all_formats(ctx->inputs[i]->type);
if ((ret = ff_set_common_formats(ctx, formats)) < 0)
return ret;
if (ctx->inputs[i]->type == AVMEDIA_TYPE_AUDIO) {
if ((ret = ff_set_common_all_samplerates (ctx)) < 0 ||
(ret = ff_set_common_all_channel_counts(ctx)) < 0)
return ret;
}
}
return 0;
}
const AVFilter ff_vf_streamselect = {
.name = "streamselect",
.description = NULL_IF_CONFIG_SMALL("Select video streams"),
.init = init,
FILTER_QUERY_FUNC(query_formats),
.process_command = process_command,
.uninit = uninit,
.activate = activate,
.priv_size = sizeof(StreamSelectContext),
.priv_class = &streamselect_class,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS,
};
const AVFilter ff_af_astreamselect = {
.name = "astreamselect",
.description = NULL_IF_CONFIG_SMALL("Select audio streams"),
.priv_class = &streamselect_class,
.init = init,
FILTER_QUERY_FUNC(query_formats),
.process_command = process_command,
.uninit = uninit,
.activate = activate,
.priv_size = sizeof(StreamSelectContext),
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS,
};