mirror of https://github.com/FFmpeg/FFmpeg.git
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/*
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* Copyright (c) 2016 Paul B Mahol |
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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 manipulating frame metadata |
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*/ |
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#include "libavutil/avassert.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/internal.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/pixelutils.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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enum MetadataMode { |
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METADATA_SELECT, |
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METADATA_ADD, |
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METADATA_MODIFY, |
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METADATA_DELETE, |
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METADATA_PRINT, |
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METADATA_NB |
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}; |
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enum MetadataFunction { |
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METADATAF_STRING, |
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METADATAF_LESS, |
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METADATAF_EQUAL, |
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METADATAF_GREATER, |
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METADATAF_EXPR, |
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METADATAF_NB |
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}; |
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static const char *const var_names[] = { |
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"VALUE1", |
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"VALUE2", |
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NULL |
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}; |
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enum var_name { |
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VAR_VALUE1, |
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VAR_VALUE2, |
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VAR_VARS_NB |
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}; |
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typedef struct MetadataContext { |
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const AVClass *class; |
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int mode; |
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char *key; |
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char *value; |
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int length; |
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int function; |
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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 (*compare)(struct MetadataContext *s, |
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const char *value1, const char *value2, size_t length); |
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} MetadataContext; |
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#define OFFSET(x) offsetof(MetadataContext, 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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{ "mode", "set a mode of operation", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, METADATA_NB-1, FLAGS, "mode" }, \
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{ "select", "select frame", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_SELECT }, 0, 0, FLAGS, "mode" }, \
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{ "add", "add new metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_ADD }, 0, 0, FLAGS, "mode" }, \
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{ "modify", "modify metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_MODIFY }, 0, 0, FLAGS, "mode" }, \
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{ "delete", "delete metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_DELETE }, 0, 0, FLAGS, "mode" }, \
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{ "print", "print metadata", 0, AV_OPT_TYPE_CONST, {.i64 = METADATA_PRINT }, 0, 0, FLAGS, "mode" }, \
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{ "key", "set metadata key", OFFSET(key), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
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{ "value", "set metadata value", OFFSET(value), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
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{ "function", "function for comparing values", OFFSET(function), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, METADATAF_NB-1, FLAGS, "function" }, \
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{ "string", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_STRING }, 0, 3, FLAGS, "function" }, \
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{ "less", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_LESS }, 0, 3, FLAGS, "function" }, \
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{ "equal", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_EQUAL }, 0, 3, FLAGS, "function" }, \
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{ "greater", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_GREATER }, 0, 3, FLAGS, "function" }, \
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{ "expr", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_EXPR }, 0, 3, FLAGS, "function" }, \
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{ "expr", "set expression for expr function", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
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{ "length", "compare up to N chars for string function", OFFSET(length), AV_OPT_TYPE_INT, {.i64 = INT_MAX }, 1, INT_MAX, FLAGS }, \
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{ NULL } \
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} |
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static int string(MetadataContext *s, const char *value1, const char *value2, size_t length) |
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{ |
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return !strncmp(value1, value2, length); |
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} |
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static int equal(MetadataContext *s, const char *value1, const char *value2, size_t length) |
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{ |
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float f1, f2; |
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if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2) |
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return 0; |
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return f1 == f2; |
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} |
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static int less(MetadataContext *s, const char *value1, const char *value2, size_t length) |
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{ |
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float f1, f2; |
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if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2) |
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return 0; |
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return f1 > f2; |
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} |
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static int greater(MetadataContext *s, const char *value1, const char *value2, size_t length) |
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{ |
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float f1, f2; |
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if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2) |
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return 0; |
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return f1 < f2; |
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} |
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static int parse_expr(MetadataContext *s, const char *value1, const char *value2, size_t length) |
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{ |
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double f1, f2; |
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if (sscanf(value1, "%lf", &f1) + sscanf(value2, "%lf", &f2) != 2) |
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return 0; |
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s->var_values[VAR_VALUE1] = f1; |
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s->var_values[VAR_VALUE1] = f2; |
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return av_expr_eval(s->expr, s->var_values, NULL); |
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} |
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static av_cold int init(AVFilterContext *ctx) |
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{ |
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MetadataContext *s = ctx->priv; |
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int ret; |
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if (!s->key && s->mode != METADATA_PRINT) { |
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av_log(ctx, AV_LOG_WARNING, "Metadata key must be set\n"); |
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return AVERROR(EINVAL); |
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} |
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if ((s->mode == METADATA_MODIFY || |
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s->mode == METADATA_ADD) && !s->value) { |
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av_log(ctx, AV_LOG_WARNING, "Missing metadata value\n"); |
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return AVERROR(EINVAL); |
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} |
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switch (s->function) { |
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case METADATAF_STRING: |
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s->compare = string; |
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break; |
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case METADATAF_LESS: |
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s->compare = less; |
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break; |
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case METADATAF_EQUAL: |
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s->compare = equal; |
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break; |
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case METADATAF_GREATER: |
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s->compare = greater; |
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break; |
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case METADATAF_EXPR: |
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s->compare = parse_expr; |
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break; |
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default: |
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av_assert0(0); |
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}; |
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if (s->function == METADATAF_EXPR) { |
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if (!s->expr_str) { |
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av_log(ctx, AV_LOG_WARNING, "expr option not set\n"); |
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return AVERROR(EINVAL); |
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} |
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if ((ret = av_expr_parse(&s->expr, s->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", s->expr_str); |
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return ret; |
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} |
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} |
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return 0; |
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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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AVFilterLink *outlink = ctx->outputs[0]; |
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MetadataContext *s = ctx->priv; |
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AVDictionary *metadata = av_frame_get_metadata(frame); |
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AVDictionaryEntry *e; |
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if (!metadata) |
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return ff_filter_frame(outlink, frame); |
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e = av_dict_get(metadata, !s->key ? "" : s->key, NULL, |
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!s->key ? AV_DICT_IGNORE_SUFFIX: 0); |
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switch (s->mode) { |
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case METADATA_SELECT: |
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if (!s->value && e && e->value) { |
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return ff_filter_frame(outlink, frame); |
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} else if (s->value && e && e->value && |
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s->compare(s, s->value, e->value, s->length)) { |
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return ff_filter_frame(outlink, frame); |
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} |
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break; |
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case METADATA_ADD: |
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if (e && e->value) { |
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; |
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} else { |
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av_dict_set(&metadata, s->key, s->value, 0); |
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} |
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return ff_filter_frame(outlink, frame); |
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break; |
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case METADATA_MODIFY: |
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if (e && e->value) { |
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av_dict_set(&metadata, s->key, s->value, 0); |
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} |
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return ff_filter_frame(outlink, frame); |
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break; |
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case METADATA_PRINT: |
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if (!s->key && e) { |
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av_log(ctx, AV_LOG_INFO, "frame %"PRId64" pts %"PRId64"\n", inlink->frame_count, frame->pts); |
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av_log(ctx, AV_LOG_INFO, "%s=%s\n", e->key, e->value); |
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while ((e = av_dict_get(metadata, "", e, AV_DICT_IGNORE_SUFFIX)) != NULL) { |
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av_log(ctx, AV_LOG_INFO, "%s=%s\n", e->key, e->value); |
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} |
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} else if (e && e->value && (!s->value || (e->value && s->compare(s, s->value, e->value, s->length)))) { |
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av_log(ctx, AV_LOG_INFO, "frame %"PRId64" pts %"PRId64"\n", inlink->frame_count, frame->pts); |
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av_log(ctx, AV_LOG_INFO, "%s=%s\n", s->key, e->value); |
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} |
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return ff_filter_frame(outlink, frame); |
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break; |
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case METADATA_DELETE: |
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if (e && e->value && s->value && s->compare(s, s->value, e->value, s->length)) { |
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av_dict_set(&metadata, s->key, NULL, 0); |
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} else if (e && e->value) { |
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av_dict_set(&metadata, s->key, NULL, 0); |
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} |
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return ff_filter_frame(outlink, frame); |
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break; |
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default: |
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av_assert0(0); |
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}; |
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av_frame_free(&frame); |
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return 0; |
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} |
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#if CONFIG_AMETADATA_FILTER |
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DEFINE_OPTIONS(ametadata, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM); |
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AVFILTER_DEFINE_CLASS(ametadata); |
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static const AVFilterPad ainputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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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 aoutputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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}, |
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{ NULL } |
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}; |
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AVFilter ff_af_ametadata = { |
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.name = "ametadata", |
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.description = NULL_IF_CONFIG_SMALL("Manipulate audio frame metadata."), |
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.priv_size = sizeof(MetadataContext), |
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.priv_class = &ametadata_class, |
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.init = init, |
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.query_formats = ff_query_formats_all, |
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.inputs = ainputs, |
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.outputs = aoutputs, |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
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}; |
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#endif /* CONFIG_AMETADATA_FILTER */ |
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#if CONFIG_METADATA_FILTER |
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DEFINE_OPTIONS(metadata, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM); |
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AVFILTER_DEFINE_CLASS(metadata); |
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static const AVFilterPad 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 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_metadata = { |
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.name = "metadata", |
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.description = NULL_IF_CONFIG_SMALL("Manipulate video frame metadata."), |
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.priv_size = sizeof(MetadataContext), |
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.priv_class = &metadata_class, |
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.init = init, |
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.inputs = inputs, |
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.outputs = outputs, |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
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}; |
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#endif /* CONFIG_METADATA_FILTER */ |
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