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/*
* Copyright (c) The FFmpeg developers
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <limits.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "avtextformat.h"
#include "libavutil/bprint.h"
#include "libavutil/opt.h"
#define writer_w8(wctx_, b_) (wctx_)->writer->writer->writer_w8((wctx_)->writer, b_)
#define writer_put_str(wctx_, str_) (wctx_)->writer->writer->writer_put_str((wctx_)->writer, str_)
#define writer_printf(wctx_, fmt_, ...) (wctx_)->writer->writer->writer_printf((wctx_)->writer, fmt_, __VA_ARGS__)
#define DEFINE_FORMATTER_CLASS(name) \
static const char *name##_get_name(void *ctx) \
{ \
return #name ; \
} \
static const AVClass name##_class = { \
.class_name = #name, \
.item_name = name##_get_name, \
.option = name##_options \
}
/* JSON output */
typedef struct JSONContext {
const AVClass *class;
int indent_level;
int compact;
const char *item_sep, *item_start_end;
} JSONContext;
#undef OFFSET
#define OFFSET(x) offsetof(JSONContext, x)
static const AVOption json_options[]= {
{ "compact", "enable compact output", OFFSET(compact), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1 },
{ "c", "enable compact output", OFFSET(compact), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1 },
{ NULL }
};
DEFINE_FORMATTER_CLASS(json);
static av_cold int json_init(AVTextFormatContext *wctx)
{
JSONContext *json = wctx->priv;
json->item_sep = json->compact ? ", " : ",\n";
json->item_start_end = json->compact ? " " : "\n";
return 0;
}
static const char *json_escape_str(AVBPrint *dst, const char *src, void *log_ctx)
{
static const char json_escape[] = {'"', '\\', '\b', '\f', '\n', '\r', '\t', 0};
static const char json_subst[] = {'"', '\\', 'b', 'f', 'n', 'r', 't', 0};
const char *p;
for (p = src; *p; p++) {
char *s = strchr(json_escape, *p);
if (s) {
av_bprint_chars(dst, '\\', 1);
av_bprint_chars(dst, json_subst[s - json_escape], 1);
} else if ((unsigned char)*p < 32) {
av_bprintf(dst, "\\u00%02x", *p & 0xff);
} else {
av_bprint_chars(dst, *p, 1);
}
}
return dst->str;
}
#define JSON_INDENT() writer_printf(wctx, "%*c", json->indent_level * 4, ' ')
static void json_print_section_header(AVTextFormatContext *wctx, const void *data)
{
JSONContext *json = wctx->priv;
AVBPrint buf;
const struct AVTextFormatSection *section = wctx->section[wctx->level];
const struct AVTextFormatSection *parent_section = wctx->level ?
wctx->section[wctx->level-1] : NULL;
if (wctx->level && wctx->nb_item[wctx->level-1])
writer_put_str(wctx, ",\n");
if (section->flags & AV_TEXTFORMAT_SECTION_FLAG_IS_WRAPPER) {
writer_put_str(wctx, "{\n");
json->indent_level++;
} else {
av_bprint_init(&buf, 1, AV_BPRINT_SIZE_UNLIMITED);
json_escape_str(&buf, section->name, wctx);
JSON_INDENT();
json->indent_level++;
if (section->flags & AV_TEXTFORMAT_SECTION_FLAG_IS_ARRAY) {
writer_printf(wctx, "\"%s\": [\n", buf.str);
} else if (parent_section && !(parent_section->flags & AV_TEXTFORMAT_SECTION_FLAG_IS_ARRAY)) {
writer_printf(wctx, "\"%s\": {%s", buf.str, json->item_start_end);
} else {
writer_printf(wctx, "{%s", json->item_start_end);
/* this is required so the parser can distinguish between packets and frames */
if (parent_section && parent_section->flags & AV_TEXTFORMAT_SECTION_FLAG_NUMBERING_BY_TYPE) {
if (!json->compact)
JSON_INDENT();
writer_printf(wctx, "\"type\": \"%s\"", section->name);
wctx->nb_item[wctx->level]++;
}
}
av_bprint_finalize(&buf, NULL);
}
}
static void json_print_section_footer(AVTextFormatContext *wctx)
{
JSONContext *json = wctx->priv;
const struct AVTextFormatSection *section = wctx->section[wctx->level];
if (wctx->level == 0) {
json->indent_level--;
writer_put_str(wctx, "\n}\n");
} else if (section->flags & AV_TEXTFORMAT_SECTION_FLAG_IS_ARRAY) {
writer_w8(wctx, '\n');
json->indent_level--;
JSON_INDENT();
writer_w8(wctx, ']');
} else {
writer_put_str(wctx, json->item_start_end);
json->indent_level--;
if (!json->compact)
JSON_INDENT();
writer_w8(wctx, '}');
}
}
static inline void json_print_item_str(AVTextFormatContext *wctx,
const char *key, const char *value)
{
AVBPrint buf;
av_bprint_init(&buf, 1, AV_BPRINT_SIZE_UNLIMITED);
writer_printf(wctx, "\"%s\":", json_escape_str(&buf, key, wctx));
av_bprint_clear(&buf);
writer_printf(wctx, " \"%s\"", json_escape_str(&buf, value, wctx));
av_bprint_finalize(&buf, NULL);
}
static void json_print_str(AVTextFormatContext *wctx, const char *key, const char *value)
{
JSONContext *json = wctx->priv;
const struct AVTextFormatSection *parent_section = wctx->level ?
wctx->section[wctx->level-1] : NULL;
if (wctx->nb_item[wctx->level] || (parent_section && parent_section->flags & AV_TEXTFORMAT_SECTION_FLAG_NUMBERING_BY_TYPE))
writer_put_str(wctx, json->item_sep);
if (!json->compact)
JSON_INDENT();
json_print_item_str(wctx, key, value);
}
static void json_print_int(AVTextFormatContext *wctx, const char *key, int64_t value)
{
JSONContext *json = wctx->priv;
const struct AVTextFormatSection *parent_section = wctx->level ?
wctx->section[wctx->level-1] : NULL;
AVBPrint buf;
if (wctx->nb_item[wctx->level] || (parent_section && parent_section->flags & AV_TEXTFORMAT_SECTION_FLAG_NUMBERING_BY_TYPE))
writer_put_str(wctx, json->item_sep);
if (!json->compact)
JSON_INDENT();
av_bprint_init(&buf, 1, AV_BPRINT_SIZE_UNLIMITED);
writer_printf(wctx, "\"%s\": %"PRId64, json_escape_str(&buf, key, wctx), value);
av_bprint_finalize(&buf, NULL);
}
const AVTextFormatter avtextformatter_json = {
.name = "json",
.priv_size = sizeof(JSONContext),
.init = json_init,
.print_section_header = json_print_section_header,
.print_section_footer = json_print_section_footer,
.print_integer = json_print_int,
.print_string = json_print_str,
.flags = AV_TEXTFORMAT_FLAG_SUPPORTS_MIXED_ARRAY_CONTENT,
.priv_class = &json_class,
};
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