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/**
* @file avfilter/filter.c Video filter using libavfilter -- filtering
*
* Copyright (C) 2020 Mikhail Kurkov
*/
#include <string.h>
#include <libavformat/avformat.h>
#include <libavfilter/buffersink.h>
#include <libavfilter/buffersrc.h>
#include <libavutil/opt.h>
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include "avfilter.h"
#include "util.h"
int filter_init(struct avfilter_st *st, const char *filter_descr,
struct vidframe *frame)
{
const AVFilter *buffersrc, *buffersink;
AVFilterInOut *outputs, *inputs;
enum AVPixelFormat src_format = vidfmt_to_avpixfmt(frame->fmt);
enum AVPixelFormat pix_fmts[] = { src_format, AV_PIX_FMT_NONE };
char args[512];
int err = 0;
if (!str_isset(filter_descr)) {
st->enabled = false;
return 0;
}
buffersrc = avfilter_get_by_name("buffer");
buffersink = avfilter_get_by_name("buffersink");
outputs = avfilter_inout_alloc();
inputs = avfilter_inout_alloc();
st->filter_graph = avfilter_graph_alloc();
st->vframe_in = av_frame_alloc();
st->vframe_out = av_frame_alloc();
if (!outputs || !inputs || !st->filter_graph ||
!st->vframe_in || !st->vframe_out) {
err = AVERROR(ENOMEM);
goto end;
}
/* buffer video source */
snprintf(args, sizeof(args),
"video_size=%dx%d:pix_fmt=%d:"
"time_base=%d/%d:pixel_aspect=1/1",
frame->size.w, frame->size.h, src_format, 1, VIDEO_TIMEBASE);
err = avfilter_graph_create_filter(
&st->buffersrc_ctx, buffersrc, "in", args, NULL,
st->filter_graph);
if (err < 0) {
warning("avfilter: cannot create buffer source\n");
goto end;
}
/* buffer video sink: to terminate the filter chain. */
err = avfilter_graph_create_filter(
&st->buffersink_ctx, buffersink, "out", NULL, NULL,
st->filter_graph);
if (err < 0) {
warning("avfilter: cannot create buffer sink\n");
goto end;
}
err = av_opt_set_int_list(
st->buffersink_ctx, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE,
AV_OPT_SEARCH_CHILDREN);
if (err < 0) {
warning("avfilter: cannot set output pixel format\n");
goto end;
}
outputs->name = av_strdup("in");
outputs->filter_ctx = st->buffersrc_ctx;
outputs->pad_idx = 0;
outputs->next = NULL;
inputs->name = av_strdup("out");
inputs->filter_ctx = st->buffersink_ctx;
inputs->pad_idx = 0;
inputs->next = NULL;
err = avfilter_graph_parse_ptr(st->filter_graph, filter_descr,
&inputs, &outputs, NULL);
if (err < 0) {
warning("avfilter: error parsing filter description: %s\n",
filter_descr);
goto end;
}
err = avfilter_graph_config(st->filter_graph, NULL);
if (err < 0) {
warning("avfilter: filter graph config failed\n");
goto end;
}
st->size = frame->size;
st->format = frame->fmt;
st->enabled = true;
info("avfilter: filter graph initialized for %s\n", filter_descr);
end:
avfilter_inout_free(&inputs);
avfilter_inout_free(&outputs);
return err;
}
void filter_reset(struct avfilter_st *st)
{
if (!st)
return;
if (!st->enabled)
return;
if (st->filter_graph)
avfilter_graph_free(&st->filter_graph);
if (st->vframe_in)
av_frame_free(&st->vframe_in);
if (st->vframe_out)
av_frame_free(&st->vframe_out);
st->enabled = false;
info("avfilter: filter graph reset\n");
}
bool filter_valid(const struct avfilter_st *st, const struct vidframe *frame)
{
bool res = !st->enabled ||
((st->size.h == frame->size.h) &&
(st->size.w == frame->size.w) &&
(st->format == frame->fmt));
return res;
}
int filter_encode(struct avfilter_st *st, struct vidframe *frame,
uint64_t *timestamp)
{
unsigned i;
int err;
if (!frame)
return 0;
if (!st->enabled) {
return 0;
}
/* fill the source frame */
st->vframe_in->format = vidfmt_to_avpixfmt(frame->fmt);
st->vframe_in->width = frame->size.w;
st->vframe_in->height = frame->size.h;
st->vframe_in->pts = *timestamp;
for (i=0; i<4; i++) {
st->vframe_in->data[i] = frame->data[i];
st->vframe_in->linesize[i] = frame->linesize[i];
}
/* push source frame into the filter graph */
err = av_buffersrc_add_frame_flags(
st->buffersrc_ctx, st->vframe_in, AV_BUFFERSRC_FLAG_KEEP_REF);
if (err < 0) {
warning("avfilter: error while feeding the filtergraph\n");
goto out;
}
/* pull filtered frames from the filtergraph */
av_frame_unref(st->vframe_out);
err = av_buffersink_get_frame(st->buffersink_ctx, st->vframe_out);
if (err == AVERROR(EAGAIN) || err == AVERROR_EOF)
goto out;
if (err < 0) {
warning("avfilter: error while getting"
" filtered frame from the filtergraph\n");
goto out;
}
avframe_ensure_topdown(st->vframe_out);
/* Copy filtered frame back to the input frame */
for (i=0; i<4; i++) {
frame->data[i] = st->vframe_out->data[i];
frame->linesize[i] = st->vframe_out->linesize[i];
}
frame->size.h = st->vframe_out->height;
frame->size.w = st->vframe_out->width;
frame->fmt = avpixfmt_to_vidfmt(st->vframe_out->format);
out:
return err;
}
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