| /* |
| * Copyright (C) 2006 Michael Niedermayer <michaelni@gmx.at> |
| * Copyright (C) 2012 Clément Bœsch <u pkh me> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU 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. |
| */ |
| |
| /** |
| * @file |
| * Generic equation change filter |
| * Originally written by Michael Niedermayer for the MPlayer project, and |
| * ported by Clément Bœsch for FFmpeg. |
| */ |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/eval.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/pixdesc.h" |
| #include "internal.h" |
| |
| typedef struct { |
| const AVClass *class; |
| AVExpr *e[4]; ///< expressions for each plane |
| char *expr_str[4+3]; ///< expression strings for each plane |
| AVFrame *picref; ///< current input buffer |
| int hsub, vsub; ///< chroma subsampling |
| int planes; ///< number of planes |
| int is_rgb; |
| } GEQContext; |
| |
| enum { Y = 0, U, V, A, G, B, R }; |
| |
| #define OFFSET(x) offsetof(GEQContext, x) |
| #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| |
| static const AVOption geq_options[] = { |
| { "lum_expr", "set luminance expression", OFFSET(expr_str[Y]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "lum", "set luminance expression", OFFSET(expr_str[Y]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "cb_expr", "set chroma blue expression", OFFSET(expr_str[U]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "cb", "set chroma blue expression", OFFSET(expr_str[U]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "cr_expr", "set chroma red expression", OFFSET(expr_str[V]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "cr", "set chroma red expression", OFFSET(expr_str[V]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "alpha_expr", "set alpha expression", OFFSET(expr_str[A]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "a", "set alpha expression", OFFSET(expr_str[A]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "red_expr", "set red expression", OFFSET(expr_str[R]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "r", "set red expression", OFFSET(expr_str[R]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "green_expr", "set green expression", OFFSET(expr_str[G]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "g", "set green expression", OFFSET(expr_str[G]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "blue_expr", "set blue expression", OFFSET(expr_str[B]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "b", "set blue expression", OFFSET(expr_str[B]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| {NULL}, |
| }; |
| |
| AVFILTER_DEFINE_CLASS(geq); |
| |
| static inline double getpix(void *priv, double x, double y, int plane) |
| { |
| int xi, yi; |
| GEQContext *geq = priv; |
| AVFrame *picref = geq->picref; |
| const uint8_t *src = picref->data[plane]; |
| const int linesize = picref->linesize[plane]; |
| const int w = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(picref->width, geq->hsub) : picref->width; |
| const int h = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(picref->height, geq->vsub) : picref->height; |
| |
| if (!src) |
| return 0; |
| |
| xi = x = av_clipf(x, 0, w - 2); |
| yi = y = av_clipf(y, 0, h - 2); |
| |
| x -= xi; |
| y -= yi; |
| |
| return (1-y)*((1-x)*src[xi + yi * linesize] + x*src[xi + 1 + yi * linesize]) |
| + y *((1-x)*src[xi + (yi+1) * linesize] + x*src[xi + 1 + (yi+1) * linesize]); |
| } |
| |
| //TODO: cubic interpolate |
| //TODO: keep the last few frames |
| static double lum(void *priv, double x, double y) { return getpix(priv, x, y, 0); } |
| static double cb(void *priv, double x, double y) { return getpix(priv, x, y, 1); } |
| static double cr(void *priv, double x, double y) { return getpix(priv, x, y, 2); } |
| static double alpha(void *priv, double x, double y) { return getpix(priv, x, y, 3); } |
| |
| static const char *const var_names[] = { "X", "Y", "W", "H", "N", "SW", "SH", "T", NULL }; |
| enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_SW, VAR_SH, VAR_T, VAR_VARS_NB }; |
| |
| static av_cold int geq_init(AVFilterContext *ctx) |
| { |
| GEQContext *geq = ctx->priv; |
| int plane, ret = 0; |
| |
| if (!geq->expr_str[Y] && !geq->expr_str[G] && !geq->expr_str[B] && !geq->expr_str[R]) { |
| av_log(ctx, AV_LOG_ERROR, "A luminance or RGB expression is mandatory\n"); |
| ret = AVERROR(EINVAL); |
| goto end; |
| } |
| geq->is_rgb = !geq->expr_str[Y]; |
| |
| if ((geq->expr_str[Y] || geq->expr_str[U] || geq->expr_str[V]) && (geq->expr_str[G] || geq->expr_str[B] || geq->expr_str[R])) { |
| av_log(ctx, AV_LOG_ERROR, "Either YCbCr or RGB but not both must be specified\n"); |
| ret = AVERROR(EINVAL); |
| goto end; |
| } |
| |
| if (!geq->expr_str[U] && !geq->expr_str[V]) { |
| /* No chroma at all: fallback on luma */ |
| geq->expr_str[U] = av_strdup(geq->expr_str[Y]); |
| geq->expr_str[V] = av_strdup(geq->expr_str[Y]); |
| } else { |
| /* One chroma unspecified, fallback on the other */ |
| if (!geq->expr_str[U]) geq->expr_str[U] = av_strdup(geq->expr_str[V]); |
| if (!geq->expr_str[V]) geq->expr_str[V] = av_strdup(geq->expr_str[U]); |
| } |
| |
| if (!geq->expr_str[A]) |
| geq->expr_str[A] = av_strdup("255"); |
| if (!geq->expr_str[G]) |
| geq->expr_str[G] = av_strdup("g(X,Y)"); |
| if (!geq->expr_str[B]) |
| geq->expr_str[B] = av_strdup("b(X,Y)"); |
| if (!geq->expr_str[R]) |
| geq->expr_str[R] = av_strdup("r(X,Y)"); |
| |
| if (geq->is_rgb ? |
| (!geq->expr_str[G] || !geq->expr_str[B] || !geq->expr_str[R]) |
| : |
| (!geq->expr_str[U] || !geq->expr_str[V] || !geq->expr_str[A])) { |
| ret = AVERROR(ENOMEM); |
| goto end; |
| } |
| |
| for (plane = 0; plane < 4; plane++) { |
| static double (*p[])(void *, double, double) = { lum, cb, cr, alpha }; |
| static const char *const func2_yuv_names[] = { "lum", "cb", "cr", "alpha", "p", NULL }; |
| static const char *const func2_rgb_names[] = { "g", "b", "r", "alpha", "p", NULL }; |
| const char *const *func2_names = geq->is_rgb ? func2_rgb_names : func2_yuv_names; |
| double (*func2[])(void *, double, double) = { lum, cb, cr, alpha, p[plane], NULL }; |
| |
| ret = av_expr_parse(&geq->e[plane], geq->expr_str[plane < 3 && geq->is_rgb ? plane+4 : plane], var_names, |
| NULL, NULL, func2_names, func2, 0, ctx); |
| if (ret < 0) |
| break; |
| } |
| |
| end: |
| return ret; |
| } |
| |
| static int geq_query_formats(AVFilterContext *ctx) |
| { |
| GEQContext *geq = ctx->priv; |
| static const enum AVPixelFormat yuv_pix_fmts[] = { |
| AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, |
| AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, |
| AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P, |
| AV_PIX_FMT_GRAY8, |
| AV_PIX_FMT_NONE |
| }; |
| static const enum AVPixelFormat rgb_pix_fmts[] = { |
| AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, |
| AV_PIX_FMT_NONE |
| }; |
| AVFilterFormats *fmts_list; |
| |
| if (geq->is_rgb) { |
| fmts_list = ff_make_format_list(rgb_pix_fmts); |
| } else |
| fmts_list = ff_make_format_list(yuv_pix_fmts); |
| if (!fmts_list) |
| return AVERROR(ENOMEM); |
| return ff_set_common_formats(ctx, fmts_list); |
| } |
| |
| static int geq_config_props(AVFilterLink *inlink) |
| { |
| GEQContext *geq = inlink->dst->priv; |
| const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
| |
| av_assert0(desc); |
| |
| geq->hsub = desc->log2_chroma_w; |
| geq->vsub = desc->log2_chroma_h; |
| geq->planes = desc->nb_components; |
| return 0; |
| } |
| |
| static int geq_filter_frame(AVFilterLink *inlink, AVFrame *in) |
| { |
| int plane; |
| GEQContext *geq = inlink->dst->priv; |
| AVFilterLink *outlink = inlink->dst->outputs[0]; |
| AVFrame *out; |
| double values[VAR_VARS_NB] = { |
| [VAR_N] = inlink->frame_count, |
| [VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base), |
| }; |
| |
| geq->picref = in; |
| out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| if (!out) { |
| av_frame_free(&in); |
| return AVERROR(ENOMEM); |
| } |
| av_frame_copy_props(out, in); |
| |
| for (plane = 0; plane < geq->planes && out->data[plane]; plane++) { |
| int x, y; |
| uint8_t *dst = out->data[plane]; |
| const int linesize = out->linesize[plane]; |
| const int w = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->w, geq->hsub) : inlink->w; |
| const int h = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->h, geq->vsub) : inlink->h; |
| |
| values[VAR_W] = w; |
| values[VAR_H] = h; |
| values[VAR_SW] = w / (double)inlink->w; |
| values[VAR_SH] = h / (double)inlink->h; |
| |
| for (y = 0; y < h; y++) { |
| values[VAR_Y] = y; |
| for (x = 0; x < w; x++) { |
| values[VAR_X] = x; |
| dst[x] = av_expr_eval(geq->e[plane], values, geq); |
| } |
| dst += linesize; |
| } |
| } |
| |
| av_frame_free(&geq->picref); |
| return ff_filter_frame(outlink, out); |
| } |
| |
| static av_cold void geq_uninit(AVFilterContext *ctx) |
| { |
| int i; |
| GEQContext *geq = ctx->priv; |
| |
| for (i = 0; i < FF_ARRAY_ELEMS(geq->e); i++) |
| av_expr_free(geq->e[i]); |
| } |
| |
| static const AVFilterPad geq_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = geq_config_props, |
| .filter_frame = geq_filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad geq_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_vf_geq = { |
| .name = "geq", |
| .description = NULL_IF_CONFIG_SMALL("Apply generic equation to each pixel."), |
| .priv_size = sizeof(GEQContext), |
| .init = geq_init, |
| .uninit = geq_uninit, |
| .query_formats = geq_query_formats, |
| .inputs = geq_inputs, |
| .outputs = geq_outputs, |
| .priv_class = &geq_class, |
| .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| }; |
