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https://github.com/FFmpeg/FFmpeg.git
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b9fd3e7a88
As per the doc, prev_selected_n should be NAN at the start. However, this was never set.
549 lines
18 KiB
C
549 lines
18 KiB
C
/*
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* Copyright (c) 2011 Stefano Sabatini
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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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/**
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* @file
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* filter for selecting which frame passes in the filterchain
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*/
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#include "config_components.h"
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#include "libavutil/avstring.h"
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#include "libavutil/eval.h"
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#include "libavutil/fifo.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "audio.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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#include "scene_sad.h"
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static const char *const var_names[] = {
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"TB", ///< timebase
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"pts", ///< original pts in the file of the frame
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"start_pts", ///< first PTS in the stream, expressed in TB units
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"prev_pts", ///< previous frame PTS
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"prev_selected_pts", ///< previous selected frame PTS
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"t", ///< timestamp expressed in seconds
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"start_t", ///< first PTS in the stream, expressed in seconds
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"prev_t", ///< previous frame time
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"prev_selected_t", ///< previously selected time
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"pict_type", ///< the type of picture in the movie
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"I",
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"P",
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"B",
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"S",
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"SI",
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"SP",
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"BI",
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"PICT_TYPE_I",
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"PICT_TYPE_P",
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"PICT_TYPE_B",
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"PICT_TYPE_S",
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"PICT_TYPE_SI",
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"PICT_TYPE_SP",
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"PICT_TYPE_BI",
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"interlace_type", ///< the frame interlace type
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"PROGRESSIVE",
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"TOPFIRST",
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"BOTTOMFIRST",
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"consumed_samples_n",///< number of samples consumed by the filter (only audio)
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"samples_n", ///< number of samples in the current frame (only audio)
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"sample_rate", ///< sample rate (only audio)
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"n", ///< frame number (starting from zero)
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"selected_n", ///< selected frame number (starting from zero)
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"prev_selected_n", ///< number of the last selected frame
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"key", ///< tell if the frame is a key frame
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#if FF_API_FRAME_PKT
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"pos", ///< original position in the file of the frame
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#endif
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"scene",
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"concatdec_select", ///< frame is within the interval set by the concat demuxer
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NULL
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};
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enum var_name {
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VAR_TB,
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VAR_PTS,
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VAR_START_PTS,
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VAR_PREV_PTS,
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VAR_PREV_SELECTED_PTS,
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VAR_T,
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VAR_START_T,
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VAR_PREV_T,
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VAR_PREV_SELECTED_T,
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VAR_PICT_TYPE,
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VAR_I,
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VAR_P,
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VAR_B,
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VAR_S,
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VAR_SI,
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VAR_SP,
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VAR_BI,
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VAR_PICT_TYPE_I,
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VAR_PICT_TYPE_P,
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VAR_PICT_TYPE_B,
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VAR_PICT_TYPE_S,
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VAR_PICT_TYPE_SI,
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VAR_PICT_TYPE_SP,
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VAR_PICT_TYPE_BI,
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VAR_INTERLACE_TYPE,
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VAR_INTERLACE_TYPE_P,
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VAR_INTERLACE_TYPE_T,
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VAR_INTERLACE_TYPE_B,
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VAR_CONSUMED_SAMPLES_N,
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VAR_SAMPLES_N,
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VAR_SAMPLE_RATE,
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VAR_N,
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VAR_SELECTED_N,
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VAR_PREV_SELECTED_N,
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VAR_KEY,
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#if FF_API_FRAME_PKT
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VAR_POS,
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#endif
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VAR_SCENE,
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VAR_CONCATDEC_SELECT,
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VAR_VARS_NB
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};
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typedef struct SelectContext {
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const AVClass *class;
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char *expr_str;
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AVExpr *expr;
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double var_values[VAR_VARS_NB];
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int bitdepth;
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int nb_planes;
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ptrdiff_t width[4];
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ptrdiff_t height[4];
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int do_scene_detect; ///< 1 if the expression requires scene detection variables, 0 otherwise
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ff_scene_sad_fn sad; ///< Sum of the absolute difference function (scene detect only)
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double prev_mafd; ///< previous MAFD (scene detect only)
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AVFrame *prev_picref; ///< previous frame (scene detect only)
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double select;
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int select_out; ///< mark the selected output pad index
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int nb_outputs;
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} SelectContext;
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#define OFFSET(x) offsetof(SelectContext, x)
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#define DEFINE_OPTIONS(filt_name, FLAGS) \
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static const AVOption filt_name##_options[] = { \
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{ "expr", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \
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{ "e", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \
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{ "outputs", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \
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{ "n", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \
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{ NULL } \
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}
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static int request_frame(AVFilterLink *outlink);
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static av_cold int init(AVFilterContext *ctx)
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{
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SelectContext *select = ctx->priv;
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int i, ret;
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if ((ret = av_expr_parse(&select->expr, select->expr_str,
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var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n",
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select->expr_str);
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return ret;
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}
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select->do_scene_detect = !!strstr(select->expr_str, "scene");
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for (i = 0; i < select->nb_outputs; i++) {
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AVFilterPad pad = { 0 };
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pad.name = av_asprintf("output%d", i);
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if (!pad.name)
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return AVERROR(ENOMEM);
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pad.type = ctx->filter->inputs[0].type;
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pad.request_frame = request_frame;
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if ((ret = ff_append_outpad_free_name(ctx, &pad)) < 0)
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return ret;
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}
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return 0;
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}
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#define INTERLACE_TYPE_P 0
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#define INTERLACE_TYPE_T 1
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#define INTERLACE_TYPE_B 2
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static int config_input(AVFilterLink *inlink)
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{
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SelectContext *select = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
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(desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
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desc->nb_components >= 3;
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select->bitdepth = desc->comp[0].depth;
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select->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format);
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for (int plane = 0; plane < select->nb_planes; plane++) {
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ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w, plane);
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int vsub = desc->log2_chroma_h;
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select->width[plane] = line_size >> (select->bitdepth > 8);
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select->height[plane] = plane == 1 || plane == 2 ? AV_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;
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}
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select->var_values[VAR_N] = 0.0;
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select->var_values[VAR_SELECTED_N] = 0.0;
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select->var_values[VAR_TB] = av_q2d(inlink->time_base);
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select->var_values[VAR_PREV_SELECTED_N] = NAN;
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select->var_values[VAR_PREV_PTS] = NAN;
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select->var_values[VAR_PREV_SELECTED_PTS] = NAN;
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select->var_values[VAR_PREV_SELECTED_T] = NAN;
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select->var_values[VAR_PREV_T] = NAN;
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select->var_values[VAR_START_PTS] = NAN;
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select->var_values[VAR_START_T] = NAN;
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select->var_values[VAR_I] = AV_PICTURE_TYPE_I;
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select->var_values[VAR_P] = AV_PICTURE_TYPE_P;
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select->var_values[VAR_B] = AV_PICTURE_TYPE_B;
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select->var_values[VAR_SI] = AV_PICTURE_TYPE_SI;
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select->var_values[VAR_SP] = AV_PICTURE_TYPE_SP;
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select->var_values[VAR_BI] = AV_PICTURE_TYPE_BI;
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select->var_values[VAR_PICT_TYPE_I] = AV_PICTURE_TYPE_I;
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select->var_values[VAR_PICT_TYPE_P] = AV_PICTURE_TYPE_P;
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select->var_values[VAR_PICT_TYPE_B] = AV_PICTURE_TYPE_B;
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select->var_values[VAR_PICT_TYPE_SI] = AV_PICTURE_TYPE_SI;
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select->var_values[VAR_PICT_TYPE_SP] = AV_PICTURE_TYPE_SP;
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select->var_values[VAR_PICT_TYPE_BI] = AV_PICTURE_TYPE_BI;
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select->var_values[VAR_INTERLACE_TYPE_P] = INTERLACE_TYPE_P;
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select->var_values[VAR_INTERLACE_TYPE_T] = INTERLACE_TYPE_T;
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select->var_values[VAR_INTERLACE_TYPE_B] = INTERLACE_TYPE_B;
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select->var_values[VAR_PICT_TYPE] = NAN;
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select->var_values[VAR_INTERLACE_TYPE] = NAN;
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select->var_values[VAR_SCENE] = NAN;
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select->var_values[VAR_CONSUMED_SAMPLES_N] = NAN;
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select->var_values[VAR_SAMPLES_N] = NAN;
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select->var_values[VAR_SAMPLE_RATE] =
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inlink->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
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if (CONFIG_SELECT_FILTER && select->do_scene_detect) {
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select->sad = ff_scene_sad_get_fn(select->bitdepth == 8 ? 8 : 16);
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if (!select->sad)
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static double get_scene_score(AVFilterContext *ctx, AVFrame *frame)
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{
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double ret = 0;
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SelectContext *select = ctx->priv;
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AVFrame *prev_picref = select->prev_picref;
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if (prev_picref &&
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frame->height == prev_picref->height &&
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frame->width == prev_picref->width) {
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uint64_t sad = 0;
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double mafd, diff;
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uint64_t count = 0;
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for (int plane = 0; plane < select->nb_planes; plane++) {
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uint64_t plane_sad;
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select->sad(prev_picref->data[plane], prev_picref->linesize[plane],
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frame->data[plane], frame->linesize[plane],
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select->width[plane], select->height[plane], &plane_sad);
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sad += plane_sad;
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count += select->width[plane] * select->height[plane];
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}
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mafd = (double)sad / count / (1ULL << (select->bitdepth - 8));
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diff = fabs(mafd - select->prev_mafd);
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ret = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);
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select->prev_mafd = mafd;
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av_frame_free(&prev_picref);
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}
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select->prev_picref = av_frame_clone(frame);
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return ret;
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}
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static double get_concatdec_select(AVFrame *frame, int64_t pts)
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{
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AVDictionary *metadata = frame->metadata;
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AVDictionaryEntry *start_time_entry = av_dict_get(metadata, "lavf.concatdec.start_time", NULL, 0);
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AVDictionaryEntry *duration_entry = av_dict_get(metadata, "lavf.concatdec.duration", NULL, 0);
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if (start_time_entry) {
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int64_t start_time = strtoll(start_time_entry->value, NULL, 10);
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if (pts >= start_time) {
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if (duration_entry) {
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int64_t duration = strtoll(duration_entry->value, NULL, 10);
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if (pts < start_time + duration)
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return -1;
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else
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return 0;
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}
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return -1;
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}
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return 0;
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}
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return NAN;
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}
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static void select_frame(AVFilterContext *ctx, AVFrame *frame)
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{
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SelectContext *select = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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double res;
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if (isnan(select->var_values[VAR_START_PTS]))
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select->var_values[VAR_START_PTS] = TS2D(frame->pts);
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if (isnan(select->var_values[VAR_START_T]))
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select->var_values[VAR_START_T] = TS2D(frame->pts) * av_q2d(inlink->time_base);
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select->var_values[VAR_N ] = inlink->frame_count_out;
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select->var_values[VAR_PTS] = TS2D(frame->pts);
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select->var_values[VAR_T ] = TS2D(frame->pts) * av_q2d(inlink->time_base);
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#if FF_API_FRAME_PKT
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FF_DISABLE_DEPRECATION_WARNINGS
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select->var_values[VAR_POS] = frame->pkt_pos == -1 ? NAN : frame->pkt_pos;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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select->var_values[VAR_KEY] = !!(frame->flags & AV_FRAME_FLAG_KEY);
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select->var_values[VAR_CONCATDEC_SELECT] = get_concatdec_select(frame, av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q));
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switch (inlink->type) {
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case AVMEDIA_TYPE_AUDIO:
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select->var_values[VAR_SAMPLES_N] = frame->nb_samples;
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break;
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case AVMEDIA_TYPE_VIDEO:
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select->var_values[VAR_INTERLACE_TYPE] =
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!(frame->flags & AV_FRAME_FLAG_INTERLACED) ? INTERLACE_TYPE_P :
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(frame->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST) ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;
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select->var_values[VAR_PICT_TYPE] = frame->pict_type;
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if (select->do_scene_detect) {
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char buf[32];
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select->var_values[VAR_SCENE] = get_scene_score(ctx, frame);
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// TODO: document metadata
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snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]);
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av_dict_set(&frame->metadata, "lavfi.scene_score", buf, 0);
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}
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break;
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}
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select->select = res = av_expr_eval(select->expr, select->var_values, NULL);
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av_log(inlink->dst, AV_LOG_DEBUG,
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"n:%f pts:%f t:%f key:%d",
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select->var_values[VAR_N],
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select->var_values[VAR_PTS],
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select->var_values[VAR_T],
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!!(frame->flags & AV_FRAME_FLAG_KEY));
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switch (inlink->type) {
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case AVMEDIA_TYPE_VIDEO:
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av_log(inlink->dst, AV_LOG_DEBUG, " interlace_type:%c pict_type:%c scene:%f",
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!(frame->flags & AV_FRAME_FLAG_INTERLACED) ? 'P' :
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(frame->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST) ? 'T' : 'B',
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av_get_picture_type_char(frame->pict_type),
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select->var_values[VAR_SCENE]);
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break;
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case AVMEDIA_TYPE_AUDIO:
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av_log(inlink->dst, AV_LOG_DEBUG, " samples_n:%d consumed_samples_n:%f",
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frame->nb_samples,
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select->var_values[VAR_CONSUMED_SAMPLES_N]);
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break;
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}
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if (res == 0) {
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select->select_out = -1; /* drop */
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} else if (isnan(res) || res < 0) {
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select->select_out = 0; /* first output */
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} else {
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select->select_out = FFMIN(ceilf(res)-1, select->nb_outputs-1); /* other outputs */
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}
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av_log(inlink->dst, AV_LOG_DEBUG, " -> select:%f select_out:%d\n", res, select->select_out);
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if (res) {
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select->var_values[VAR_PREV_SELECTED_N] = select->var_values[VAR_N];
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select->var_values[VAR_PREV_SELECTED_PTS] = select->var_values[VAR_PTS];
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select->var_values[VAR_PREV_SELECTED_T] = select->var_values[VAR_T];
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select->var_values[VAR_SELECTED_N] += 1.0;
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if (inlink->type == AVMEDIA_TYPE_AUDIO)
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select->var_values[VAR_CONSUMED_SAMPLES_N] += frame->nb_samples;
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}
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select->var_values[VAR_PREV_PTS] = select->var_values[VAR_PTS];
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select->var_values[VAR_PREV_T] = select->var_values[VAR_T];
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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SelectContext *select = ctx->priv;
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select_frame(ctx, frame);
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if (select->select)
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return ff_filter_frame(ctx->outputs[select->select_out], frame);
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av_frame_free(&frame);
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return 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterLink *inlink = outlink->src->inputs[0];
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int ret = ff_request_frame(inlink);
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return ret;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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SelectContext *select = ctx->priv;
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av_expr_free(select->expr);
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select->expr = NULL;
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if (select->do_scene_detect) {
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av_frame_free(&select->prev_picref);
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}
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}
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#if CONFIG_ASELECT_FILTER
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DEFINE_OPTIONS(aselect, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
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AVFILTER_DEFINE_CLASS(aselect);
|
|
|
|
static av_cold int aselect_init(AVFilterContext *ctx)
|
|
{
|
|
SelectContext *select = ctx->priv;
|
|
int ret;
|
|
|
|
if ((ret = init(ctx)) < 0)
|
|
return ret;
|
|
|
|
if (select->do_scene_detect) {
|
|
av_log(ctx, AV_LOG_ERROR, "Scene detection is ignored in aselect filter\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const AVFilterPad avfilter_af_aselect_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.config_props = config_input,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
};
|
|
|
|
const AVFilter ff_af_aselect = {
|
|
.name = "aselect",
|
|
.description = NULL_IF_CONFIG_SMALL("Select audio frames to pass in output."),
|
|
.init = aselect_init,
|
|
.uninit = uninit,
|
|
.priv_size = sizeof(SelectContext),
|
|
FILTER_INPUTS(avfilter_af_aselect_inputs),
|
|
.priv_class = &aselect_class,
|
|
.flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
|
|
};
|
|
#endif /* CONFIG_ASELECT_FILTER */
|
|
|
|
#if CONFIG_SELECT_FILTER
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
SelectContext *select = ctx->priv;
|
|
|
|
if (!select->do_scene_detect) {
|
|
return ff_default_query_formats(ctx);
|
|
} else {
|
|
static const enum AVPixelFormat pix_fmts[] = {
|
|
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, AV_PIX_FMT_RGBA,
|
|
AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, AV_PIX_FMT_GRAY8,
|
|
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
|
|
AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
|
|
AV_PIX_FMT_YUV420P10,
|
|
AV_PIX_FMT_NONE
|
|
};
|
|
return ff_set_common_formats_from_list(ctx, pix_fmts);
|
|
}
|
|
}
|
|
|
|
DEFINE_OPTIONS(select, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
|
|
AVFILTER_DEFINE_CLASS(select);
|
|
|
|
static av_cold int select_init(AVFilterContext *ctx)
|
|
{
|
|
int ret;
|
|
|
|
if ((ret = init(ctx)) < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const AVFilterPad avfilter_vf_select_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_input,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
};
|
|
|
|
const AVFilter ff_vf_select = {
|
|
.name = "select",
|
|
.description = NULL_IF_CONFIG_SMALL("Select video frames to pass in output."),
|
|
.init = select_init,
|
|
.uninit = uninit,
|
|
.priv_size = sizeof(SelectContext),
|
|
.priv_class = &select_class,
|
|
FILTER_INPUTS(avfilter_vf_select_inputs),
|
|
FILTER_QUERY_FUNC(query_formats),
|
|
.flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS | AVFILTER_FLAG_METADATA_ONLY,
|
|
};
|
|
#endif /* CONFIG_SELECT_FILTER */
|