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FFmpeg/libavfilter/vf_fieldhint.c

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/*
* Copyright (c) 2016 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/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
enum HintModes {
ABSOLUTE_HINT,
RELATIVE_HINT,
PATTERN_HINT,
NB_HINTS,
};
typedef struct FieldHintContext {
const AVClass *class;
char *hint_file_str;
FILE *hint;
int mode;
AVFrame *frame[3];
int64_t line;
int nb_planes;
int eof;
int planewidth[4];
int planeheight[4];
} FieldHintContext;
#define OFFSET(x) offsetof(FieldHintContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption fieldhint_options[] = {
{ "hint", "set hint file", OFFSET(hint_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "mode", "set hint mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_HINTS-1, FLAGS, "mode" },
{ "absolute", 0, 0, AV_OPT_TYPE_CONST, {.i64=ABSOLUTE_HINT}, 0, 0, FLAGS, "mode" },
{ "relative", 0, 0, AV_OPT_TYPE_CONST, {.i64=RELATIVE_HINT}, 0, 0, FLAGS, "mode" },
{ "pattern", 0, 0, AV_OPT_TYPE_CONST, {.i64=PATTERN_HINT}, 0, 0, FLAGS, "mode" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(fieldhint);
static av_cold int init(AVFilterContext *ctx)
{
FieldHintContext *s = ctx->priv;
int ret;
if (!s->hint_file_str) {
av_log(ctx, AV_LOG_ERROR, "Hint file must be set.\n");
return AVERROR(EINVAL);
}
s->hint = av_fopen_utf8(s->hint_file_str, "r");
if (!s->hint) {
ret = AVERROR(errno);
av_log(ctx, AV_LOG_ERROR, "%s: %s\n", s->hint_file_str, av_err2str(ret));
return ret;
}
return 0;
}
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 config_input(AVFilterLink *inlink)
{
FieldHintContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int ret;
if ((ret = av_image_fill_linesizes(s->planewidth, inlink->format, inlink->w)) < 0)
return ret;
s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
s->planeheight[0] = s->planeheight[3] = inlink->h;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
FieldHintContext *s = ctx->priv;
AVFrame *out, *top, *bottom;
char buf[1024] = { 0 };
int64_t tf, bf;
int tfactor = 0, bfactor = 1;
char hint = '=', field = '=';
int p;
av_frame_free(&s->frame[0]);
s->frame[0] = s->frame[1];
s->frame[1] = s->frame[2];
s->frame[2] = in;
if (!s->frame[1])
return 0;
else if (!s->frame[0]) {
s->frame[0] = av_frame_clone(s->frame[1]);
if (!s->frame[0])
return AVERROR(ENOMEM);
}
while (1) {
if (fgets(buf, sizeof(buf)-1, s->hint)) {
s->line++;
if (buf[0] == '#' || buf[0] == ';') {
continue;
} else if (sscanf(buf, "%"PRId64",%"PRId64" %c %c", &tf, &bf, &hint, &field) == 4) {
;
} else if (sscanf(buf, "%"PRId64",%"PRId64" %c", &tf, &bf, &hint) == 3) {
;
} else if (sscanf(buf, "%"PRId64",%"PRId64"", &tf, &bf) == 2) {
;
} else {
av_log(ctx, AV_LOG_ERROR, "Invalid entry at line %"PRId64".\n", s->line);
return AVERROR_INVALIDDATA;
}
switch (s->mode) {
case ABSOLUTE_HINT:
if (tf > outlink->frame_count_in + 1 || tf < FFMAX(0, outlink->frame_count_in - 1) ||
bf > outlink->frame_count_in + 1 || bf < FFMAX(0, outlink->frame_count_in - 1)) {
av_log(ctx, AV_LOG_ERROR, "Out of range frames %"PRId64" and/or %"PRId64" on line %"PRId64" for %"PRId64". input frame.\n", tf, bf, s->line, inlink->frame_count_out);
return AVERROR_INVALIDDATA;
}
break;
case PATTERN_HINT:
case RELATIVE_HINT:
if (tf > 1 || tf < -1 ||
bf > 1 || bf < -1) {
av_log(ctx, AV_LOG_ERROR, "Out of range %"PRId64" and/or %"PRId64" on line %"PRId64" for %"PRId64". input frame.\n", tf, bf, s->line, inlink->frame_count_out);
return AVERROR_INVALIDDATA;
}
break;
default:
return AVERROR_BUG;
};
break;
} else {
if (s->mode == PATTERN_HINT) {
fseek(s->hint, 0, SEEK_SET);
continue;
}
av_log(ctx, AV_LOG_ERROR, "Missing entry for %"PRId64". input frame.\n", inlink->frame_count_out);
return AVERROR_INVALIDDATA;
}
}
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
av_frame_copy_props(out, s->frame[1]);
switch (s->mode) {
case ABSOLUTE_HINT:
top = s->frame[tf - outlink->frame_count_in + 1];
bottom = s->frame[bf - outlink->frame_count_in + 1];
break;
case PATTERN_HINT:
case RELATIVE_HINT:
top = s->frame[1 + tf];
bottom = s->frame[1 + bf];
break;
default:
av_assert0(0);
}
switch (field) {
case 'b':
tfactor = 1;
top = bottom;
break;
case 't':
bfactor = 0;
bottom = top;
break;
case '=':
break;
default:
av_log(ctx, AV_LOG_ERROR, "Invalid field: %c.\n", field);
av_frame_free(&out);
return AVERROR(EINVAL);
}
switch (hint) {
case '+':
out->interlaced_frame = 1;
break;
case '-':
out->interlaced_frame = 0;
break;
case '=':
break;
case 'b':
tfactor = 1;
top = bottom;
break;
case 't':
bfactor = 0;
bottom = top;
break;
default:
av_log(ctx, AV_LOG_ERROR, "Invalid hint: %c.\n", hint);
av_frame_free(&out);
return AVERROR(EINVAL);
}
for (p = 0; p < s->nb_planes; p++) {
av_image_copy_plane(out->data[p],
out->linesize[p] * 2,
top->data[p] + tfactor * top->linesize[p],
top->linesize[p] * 2,
s->planewidth[p],
(s->planeheight[p] + 1) / 2);
av_image_copy_plane(out->data[p] + out->linesize[p],
out->linesize[p] * 2,
bottom->data[p] + bfactor * bottom->linesize[p],
bottom->linesize[p] * 2,
s->planewidth[p],
(s->planeheight[p] + 1) / 2);
}
return ff_filter_frame(outlink, out);
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
FieldHintContext *s = ctx->priv;
int ret;
if (s->eof)
return AVERROR_EOF;
ret = ff_request_frame(ctx->inputs[0]);
if (ret == AVERROR_EOF && s->frame[2]) {
AVFrame *next = av_frame_clone(s->frame[2]);
if (!next)
return AVERROR(ENOMEM);
ret = filter_frame(ctx->inputs[0], next);
s->eof = 1;
}
return ret;
}
static av_cold void uninit(AVFilterContext *ctx)
{
FieldHintContext *s = ctx->priv;
if (s->hint)
fclose(s->hint);
s->hint = NULL;
av_frame_free(&s->frame[0]);
av_frame_free(&s->frame[1]);
av_frame_free(&s->frame[2]);
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
},
};
const AVFilter ff_vf_fieldhint = {
.name = "fieldhint",
.description = NULL_IF_CONFIG_SMALL("Field matching using hints."),
.priv_size = sizeof(FieldHintContext),
.priv_class = &fieldhint_class,
.init = init,
.uninit = uninit,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(outputs),
FILTER_QUERY_FUNC(query_formats),
};
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