433 lines
13 KiB
C
433 lines
13 KiB
C
/*
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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 <float.h>
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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/internal.h"
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#include "libavutil/opt.h"
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#include "libavutil/timestamp.h"
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#include "libavformat/avio.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_SAME_STR,
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METADATAF_STARTS_WITH,
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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_ENDS_WITH,
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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 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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AVIOContext* avio_context;
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char *file_str;
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int (*compare)(struct MetadataContext *s,
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const char *value1, const char *value2);
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void (*print)(AVFilterContext *ctx, const char *msg, ...) av_printf_format(2, 3);
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int direct; // reduces buffering when printing to user-supplied URL
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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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{ "same_str", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_SAME_STR }, 0, 3, FLAGS, "function" }, \
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{ "starts_with", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_STARTS_WITH }, 0, 0, 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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{ "ends_with", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_ENDS_WITH }, 0, 0, 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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{ "file", "set file where to print metadata information", OFFSET(file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS }, \
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{ "direct", "reduce buffering when printing to user-set file or pipe", OFFSET(direct), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS }, \
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{ NULL } \
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}
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static int same_str(MetadataContext *s, const char *value1, const char *value2)
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{
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return !strcmp(value1, value2);
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}
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static int starts_with(MetadataContext *s, const char *value1, const char *value2)
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{
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return !strncmp(value1, value2, strlen(value2));
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}
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static int ends_with(MetadataContext *s, const char *value1, const char *value2)
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{
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const int len1 = strlen(value1);
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const int len2 = strlen(value2);
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return !strncmp(value1 + FFMAX(len1 - len2, 0), value2, len2);
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}
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static int equal(MetadataContext *s, const char *value1, const char *value2)
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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 fabsf(f1 - f2) < FLT_EPSILON;
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}
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static int less(MetadataContext *s, const char *value1, const char *value2)
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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) < FLT_EPSILON;
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}
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static int greater(MetadataContext *s, const char *value1, const char *value2)
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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 (f2 - f1) < FLT_EPSILON;
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}
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static int parse_expr(MetadataContext *s, const char *value1, const char *value2)
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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_VALUE2] = f2;
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return av_expr_eval(s->expr, s->var_values, NULL);
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}
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static void print_log(AVFilterContext *ctx, const char *msg, ...)
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{
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va_list argument_list;
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va_start(argument_list, msg);
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if (msg)
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av_vlog(ctx, AV_LOG_INFO, msg, argument_list);
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va_end(argument_list);
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}
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static void print_file(AVFilterContext *ctx, const char *msg, ...)
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{
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MetadataContext *s = ctx->priv;
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va_list argument_list;
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va_start(argument_list, msg);
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if (msg) {
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char buf[128];
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vsnprintf(buf, sizeof(buf), msg, argument_list);
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avio_write(s->avio_context, buf, av_strnlen(buf, sizeof(buf)));
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}
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va_end(argument_list);
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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 && s->mode != METADATA_DELETE) {
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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_SAME_STR:
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s->compare = same_str;
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break;
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case METADATAF_STARTS_WITH:
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s->compare = starts_with;
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break;
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case METADATAF_ENDS_WITH:
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s->compare = ends_with;
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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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if (s->mode == METADATA_PRINT && s->file_str) {
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s->print = print_file;
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} else {
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s->print = print_log;
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}
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s->avio_context = NULL;
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if (s->file_str) {
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if (!strcmp("-", s->file_str)) {
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ret = avio_open(&s->avio_context, "pipe:1", AVIO_FLAG_WRITE);
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} else {
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ret = avio_open(&s->avio_context, s->file_str, AVIO_FLAG_WRITE);
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}
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if (ret < 0) {
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char buf[128];
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av_strerror(ret, buf, sizeof(buf));
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av_log(ctx, AV_LOG_ERROR, "Could not open %s: %s\n",
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s->file_str, buf);
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return ret;
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}
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if (s->direct)
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s->avio_context->direct = AVIO_FLAG_DIRECT;
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}
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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MetadataContext *s = ctx->priv;
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av_expr_free(s->expr);
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s->expr = NULL;
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if (s->avio_context) {
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avio_closep(&s->avio_context);
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}
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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 = &frame->metadata;
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AVDictionaryEntry *e;
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if (!*metadata && s->mode != METADATA_ADD)
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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, e->value, s->value)) {
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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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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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case METADATA_PRINT:
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if (!s->key && e) {
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s->print(ctx, "frame:%-4"PRId64" pts:%-7s pts_time:%s\n",
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inlink->frame_count_out, av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));
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s->print(ctx, "%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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s->print(ctx, "%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, e->value, s->value)))) {
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s->print(ctx, "frame:%-4"PRId64" pts:%-7s pts_time:%s\n",
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inlink->frame_count_out, av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));
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s->print(ctx, "%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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case METADATA_DELETE:
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if (!s->key) {
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av_dict_free(metadata);
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} else if (e && e->value && (!s->value || s->compare(s, e->value, s->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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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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.uninit = uninit,
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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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.uninit = uninit,
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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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