mirror of
https://github.com/FFmpeg/FFmpeg.git
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140 lines
4.0 KiB
C
140 lines
4.0 KiB
C
/*
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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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/**
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* @file
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* Display frame palette (AV_PIX_FMT_PAL8)
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*/
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#include "libavutil/avassert.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 ShowPaletteContext {
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const AVClass *class;
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int size;
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} ShowPaletteContext;
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#define OFFSET(x) offsetof(ShowPaletteContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption showpalette_options[] = {
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{ "s", "set pixel box size", OFFSET(size), AV_OPT_TYPE_INT, {.i64=30}, 1, 100, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(showpalette);
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat in_fmts[] = {AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE};
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static const enum AVPixelFormat out_fmts[] = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};
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int ret;
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AVFilterFormats *in = ff_make_format_list(in_fmts);
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AVFilterFormats *out = ff_make_format_list(out_fmts);
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if (!in || !out) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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if ((ret = ff_formats_ref(in , &ctx->inputs[0]->out_formats)) < 0 ||
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(ret = ff_formats_ref(out, &ctx->outputs[0]->in_formats)) < 0)
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goto fail;
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return 0;
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fail:
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if (in)
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av_freep(&in->formats);
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av_freep(&in);
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if (out)
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av_freep(&out->formats);
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av_freep(&out);
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return ret;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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const ShowPaletteContext *s = ctx->priv;
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outlink->w = outlink->h = 16 * s->size;
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return 0;
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}
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static int disp_palette(AVFrame *out, const AVFrame *in, int size)
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{
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int x, y, i, j;
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uint32_t *dst = (uint32_t *)out->data[0];
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const int dst_linesize = out->linesize[0] >> 2;
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const uint32_t *pal = (uint32_t *)in->data[1];
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for (y = 0; y < 16; y++)
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for (x = 0; x < 16; x++)
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for (j = 0; j < size; j++)
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for (i = 0; i < size; i++)
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dst[(y*dst_linesize + x) * size + j*dst_linesize + i] = pal[y*16 + x];
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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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int ret;
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AVFrame *out;
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AVFilterContext *ctx = inlink->dst;
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const ShowPaletteContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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ret = disp_palette(out, in, s->size);
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av_frame_free(&in);
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return ret < 0 ? ret : ff_filter_frame(outlink, out);
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}
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static const AVFilterPad showpalette_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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},
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{ NULL }
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};
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static const AVFilterPad showpalette_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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},
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{ NULL }
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};
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AVFilter ff_vf_showpalette = {
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.name = "showpalette",
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.description = NULL_IF_CONFIG_SMALL("Display frame palette."),
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.priv_size = sizeof(ShowPaletteContext),
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.query_formats = query_formats,
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.inputs = showpalette_inputs,
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.outputs = showpalette_outputs,
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.priv_class = &showpalette_class,
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};
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