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avprobe: provide JSON output

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JSON usage is quite widespread.
This commit is contained in:
Luca Barbato 2012-05-24 12:22:29 -07:00
parent 3a8c95f730
commit 0d242a7713
1 changed files with 120 additions and 0 deletions
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120
avprobe.c
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@ -97,6 +97,7 @@ typedef struct {
static AVIOContext *probe_out = NULL;
static OutputContext octx;
#define AVP_INDENT() avio_printf(probe_out, "%*c", octx.level * 2, ' ')
/*
* Default format, INI
@ -189,6 +190,96 @@ static void ini_print_string(const char *key, const char *value)
avio_w8(probe_out, '\n');
}
/*
* Alternate format, JSON
*/
static void json_print_header(void)
{
avio_printf(probe_out, "{");
}
static void json_print_footer(void)
{
avio_printf(probe_out, "}\n");
}
static void json_print_array_header(const char *name)
{
if (octx.prefix[octx.level -1].nb_elems)
avio_printf(probe_out, ",\n");
AVP_INDENT();
avio_printf(probe_out, "\"%s\" : ", name);
avio_printf(probe_out, "[\n");
}
static void json_print_array_footer(const char *name)
{
avio_printf(probe_out, "\n");
AVP_INDENT();
avio_printf(probe_out, "]");
}
static void json_print_object_header(const char *name)
{
if (octx.prefix[octx.level -1].nb_elems)
avio_printf(probe_out, ",\n");
AVP_INDENT();
if (octx.prefix[octx.level -1].type == OBJECT)
avio_printf(probe_out, "\"%s\" : ", name);
avio_printf(probe_out, "{\n");
}
static void json_print_object_footer(const char *name)
{
avio_printf(probe_out, "\n");
AVP_INDENT();
avio_printf(probe_out, "}");
}
static void json_print_integer(const char *key, int64_t value)
{
if (octx.prefix[octx.level -1].nb_elems)
avio_printf(probe_out, ",\n");
AVP_INDENT();
avio_printf(probe_out, "\"%s\" : %"PRId64"", key, value);
}
static void json_escape_print(const char *s)
{
int i = 0;
char c = 0;
while (c = s[i++]) {
switch (c) {
case '\r': avio_printf(probe_out, "%s", "\\r"); break;
case '\n': avio_printf(probe_out, "%s", "\\n"); break;
case '\f': avio_printf(probe_out, "%s", "\\f"); break;
case '\b': avio_printf(probe_out, "%s", "\\b"); break;
case '\t': avio_printf(probe_out, "%s", "\\t"); break;
case '\\':
case '"' : avio_w8(probe_out, '\\');
default:
if ((unsigned char)c < 32)
avio_printf(probe_out, "\\u00%02x", c & 0xff);
else
avio_w8(probe_out, c);
break;
}
}
}
static void json_print_string(const char *key, const char *value)
{
if (octx.prefix[octx.level -1].nb_elems)
avio_printf(probe_out, ",\n");
AVP_INDENT();
avio_w8(probe_out, '\"');
json_escape_print(key);
avio_printf(probe_out, "\" : \"");
json_escape_print(value);
avio_w8(probe_out, '\"');
}
/*
* Simple Formatter for single entries.
*/
@ -666,6 +757,34 @@ static int opt_format(const char *opt, const char *arg)
return 0;
}
static void opt_output_format(const char *opt, const char *arg)
{
if (!strcmp(arg, "json")) {
print_header = json_print_header;
print_footer = json_print_footer;
print_array_header = json_print_array_header;
print_array_footer = json_print_array_footer;
print_object_header = json_print_object_header;
print_object_footer = json_print_object_footer;
print_integer = json_print_integer;
print_string = json_print_string;
} else
if (!strcmp(arg, "ini")) {
print_header = ini_print_header;
print_footer = ini_print_footer;
print_array_header = ini_print_array_header;
print_object_header = ini_print_object_header;
print_integer = ini_print_integer;
print_string = ini_print_string;
} else {
av_log(NULL, AV_LOG_ERROR, "Unsupported formatter %s\n", arg);
exit(1);
}
}
static int opt_show_format_entry(const char *opt, const char *arg)
{
do_show_format = 1;
@ -716,6 +835,7 @@ static void opt_pretty(void)
static const OptionDef options[] = {
#include "cmdutils_common_opts.h"
{ "f", HAS_ARG, {(void*)opt_format}, "force format", "format" },
{ "of", HAS_ARG, {(void*)&opt_output_format}, "output the document either as ini or json", "output_format" },
{ "unit", OPT_BOOL, {(void*)&show_value_unit},
"show unit of the displayed values" },
{ "prefix", OPT_BOOL, {(void*)&use_value_prefix},