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FFmpeg/libavfilter/tests/filtfmts.c

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/*
* Copyright (c) 2009 Stefano Sabatini
*
* 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 <stdio.h>
#include "libavutil/channel_layout.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "libavutil/samplefmt.h"
#define FF_INTERNAL_FIELDS 1
#include "libavfilter/framequeue.h"
#include "libavfilter/avfilter.h"
#include "libavfilter/formats.h"
#include "libavfilter/internal.h"
static void print_formats_internal(AVFilterLink **links, const AVFilterPad *pads,
unsigned nb, size_t fmts_cfg_offset,
const char *inout_string)
{
for (unsigned i = 0; i < nb; i++) {
const AVFilterLink *const link = links[i];
const AVFilterFormatsConfig *const cfg = (AVFilterFormatsConfig*)((const char*)link + fmts_cfg_offset);
const char *pad_name = avfilter_pad_get_name(pads, i);
if (link->type == AVMEDIA_TYPE_VIDEO) {
const AVFilterFormats *const fmts = cfg->formats;
for (unsigned j = 0; fmts && j < fmts->nb_formats; j++) {
printf("%s[%u] %s: fmt:%s\n",
inout_string, i, pad_name,
av_get_pix_fmt_name(fmts->formats[j]));
}
} else if (link->type == AVMEDIA_TYPE_AUDIO) {
const AVFilterFormats *const fmts = cfg->formats;
const AVFilterChannelLayouts *const layouts = cfg->channel_layouts;
for (unsigned j = 0; fmts && j < fmts->nb_formats; j++)
printf("%s[%u] %s: fmt:%s\n",
inout_string, i, pad_name,
av_get_sample_fmt_name(fmts->formats[j]));
for (unsigned j = 0; layouts && j < layouts->nb_channel_layouts; j++) {
char buf[256];
av_channel_layout_describe(&layouts->channel_layouts[j], buf, sizeof(buf));
printf("%s[%u] %s: chlayout:%s\n",
inout_string, i, pad_name, buf);
}
}
}
}
static void print_formats(AVFilterContext *filter_ctx)
{
print_formats_internal(filter_ctx->inputs, filter_ctx->input_pads,
filter_ctx->nb_inputs,
offsetof(AVFilterLink, outcfg), "INPUT");
print_formats_internal(filter_ctx->outputs, filter_ctx->output_pads,
filter_ctx->nb_outputs,
offsetof(AVFilterLink, incfg), "OUTPUT");
}
int main(int argc, char **argv)
{
const AVFilter *filter;
AVFilterContext *filter_ctx;
AVFilterGraph *graph_ctx;
const char *filter_name;
const char *filter_args = NULL;
int i;
int ret = 0;
av_log_set_level(AV_LOG_DEBUG);
if (argc < 2) {
fprintf(stderr, "Missing filter name as argument\n");
return 1;
}
filter_name = argv[1];
if (argc > 2)
filter_args = argv[2];
/* allocate graph */
graph_ctx = avfilter_graph_alloc();
if (!graph_ctx)
return 1;
/* get a corresponding filter and open it */
if (!(filter = avfilter_get_by_name(filter_name))) {
fprintf(stderr, "Unrecognized filter with name '%s'\n", filter_name);
return 1;
}
/* open filter and add it to the graph */
if (!(filter_ctx = avfilter_graph_alloc_filter(graph_ctx, filter, filter_name))) {
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fprintf(stderr, "Impossible to open filter with name '%s'\n",
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filter_name);
return 1;
}
if (avfilter_init_str(filter_ctx, filter_args) < 0) {
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fprintf(stderr, "Impossible to init filter '%s' with arguments '%s'\n",
filter_name, filter_args);
return 1;
}
/* create a link for each of the input pads */
for (i = 0; i < filter_ctx->nb_inputs; i++) {
AVFilterLink *link = av_mallocz(sizeof(AVFilterLink));
if (!link) {
fprintf(stderr, "Unable to allocate memory for filter input link\n");
ret = 1;
goto fail;
}
link->type = avfilter_pad_get_type(filter_ctx->input_pads, i);
filter_ctx->inputs[i] = link;
}
for (i = 0; i < filter_ctx->nb_outputs; i++) {
AVFilterLink *link = av_mallocz(sizeof(AVFilterLink));
if (!link) {
fprintf(stderr, "Unable to allocate memory for filter output link\n");
ret = 1;
goto fail;
}
link->type = avfilter_pad_get_type(filter_ctx->output_pads, i);
filter_ctx->outputs[i] = link;
}
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>
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if (filter->formats_state == FF_FILTER_FORMATS_QUERY_FUNC)
ret = filter->formats.query_func(filter_ctx);
else
ret = ff_default_query_formats(filter_ctx);
print_formats(filter_ctx);
fail:
avfilter_free(filter_ctx);
avfilter_graph_free(&graph_ctx);
fflush(stdout);
return ret;
}