mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-25 19:01:51 +02:00
184 lines
5.3 KiB
C
184 lines
5.3 KiB
C
/*
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* Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <math.h>
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#include "libavutil/eval.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct QPContext {
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const AVClass *class;
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char *qp_expr_str;
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int8_t lut[257];
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int h, qstride;
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int evaluate_per_mb;
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} QPContext;
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#define OFFSET(x) offsetof(QPContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption qp_options[] = {
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{ "qp", "set qp expression", OFFSET(qp_expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(qp);
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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QPContext *s = ctx->priv;
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int i;
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int ret;
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AVExpr *e = NULL;
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static const char *var_names[] = { "known", "qp", "x", "y", "w", "h", NULL };
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if (!s->qp_expr_str)
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return 0;
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ret = av_expr_parse(&e, s->qp_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
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if (ret < 0)
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return ret;
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s->h = (inlink->h + 15) >> 4;
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s->qstride = (inlink->w + 15) >> 4;
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for (i = -129; i < 128; i++) {
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double var_values[] = { i != -129, i, NAN, NAN, s->qstride, s->h, 0};
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double temp_val = av_expr_eval(e, var_values, NULL);
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if (isnan(temp_val)) {
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if(strchr(s->qp_expr_str, 'x') || strchr(s->qp_expr_str, 'y'))
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s->evaluate_per_mb = 1;
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else {
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av_expr_free(e);
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return AVERROR(EINVAL);
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}
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}
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s->lut[i + 129] = lrintf(temp_val);
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}
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av_expr_free(e);
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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QPContext *s = ctx->priv;
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AVBufferRef *out_qp_table_buf;
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AVFrame *out = NULL;
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const int8_t *in_qp_table;
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int type, stride, ret;
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if (!s->qp_expr_str || ctx->is_disabled)
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return ff_filter_frame(outlink, in);
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out_qp_table_buf = av_buffer_alloc(s->h * s->qstride);
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if (!out_qp_table_buf) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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out = av_frame_clone(in);
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if (!out) {
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av_buffer_unref(&out_qp_table_buf);
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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in_qp_table = av_frame_get_qp_table(in, &stride, &type);
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av_frame_set_qp_table(out, out_qp_table_buf, s->qstride, type);
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if (s->evaluate_per_mb) {
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int y, x;
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for (y = 0; y < s->h; y++)
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for (x = 0; x < s->qstride; x++) {
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int qp = in_qp_table ? in_qp_table[x + stride * y] : NAN;
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double var_values[] = { !!in_qp_table, qp, x, y, s->qstride, s->h, 0};
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static const char *var_names[] = { "known", "qp", "x", "y", "w", "h", NULL };
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double temp_val;
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ret = av_expr_parse_and_eval(&temp_val, s->qp_expr_str,
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var_names, var_values,
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NULL, NULL, NULL, NULL, 0, 0, ctx);
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if (ret < 0)
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goto fail;
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out_qp_table_buf->data[x + s->qstride * y] = lrintf(temp_val);
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}
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} else if (in_qp_table) {
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int y, x;
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for (y = 0; y < s->h; y++)
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for (x = 0; x < s->qstride; x++)
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out_qp_table_buf->data[x + s->qstride * y] = s->lut[129 +
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((int8_t)in_qp_table[x + stride * y])];
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} else {
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int y, x, qp = s->lut[0];
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for (y = 0; y < s->h; y++)
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for (x = 0; x < s->qstride; x++)
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out_qp_table_buf->data[x + s->qstride * y] = qp;
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}
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ret = ff_filter_frame(outlink, out);
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out = NULL;
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fail:
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av_frame_free(&in);
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av_frame_free(&out);
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return ret;
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}
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static const AVFilterPad qp_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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{ NULL }
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};
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static const AVFilterPad qp_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_qp = {
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.name = "qp",
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.description = NULL_IF_CONFIG_SMALL("Change video quantization parameters."),
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.priv_size = sizeof(QPContext),
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.inputs = qp_inputs,
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.outputs = qp_outputs,
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.priv_class = &qp_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
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};
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