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ffmpeg-kit/apple/src/MediaInformationJsonParser.m

79 lines
3.0 KiB

/*
* Copyright (c) 2018-2022 Taner Sener
*
* This file is part of FFmpegKit.
*
* FFmpegKit 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 3 of the License, or
* (at your option) any later version.
*
* FFmpegKit 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 FFmpegKit. If not, see <http://www.gnu.org/licenses/>.
*/
#import "MediaInformationJsonParser.h"
NSString *const MediaInformationJsonParserKeyStreams = @"streams";
NSString *const MediaInformationJsonParserKeyChapters = @"chapters";
@implementation MediaInformationJsonParser
+ (MediaInformation *)from:(NSString *)ffprobeJsonOutput {
@try {
return [self fromWithError:ffprobeJsonOutput];
} @catch (NSException *exception) {
NSLog(@"MediaInformation parsing failed: %@.\n",
[NSString stringWithFormat:@"%@\n%@", [exception userInfo],
[exception callStackSymbols]]);
return nil;
}
}
+ (MediaInformation *)fromWithError:(NSString *)ffprobeJsonOutput {
NSError *error = nil;
NSData *jsonData =
[ffprobeJsonOutput dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *jsonDictionary =
[NSJSONSerialization JSONObjectWithData:jsonData
options:kNilOptions
error:&error];
if (error != nil) {
@throw [NSException
exceptionWithName:@"ParsingException"
reason:[NSString
stringWithFormat:@"%ld", (long)[error code]]
userInfo:[error userInfo]];
}
if (jsonDictionary == nil) {
return nil;
}
NSArray *jsonStreamArray =
[jsonDictionary objectForKey:MediaInformationJsonParserKeyStreams];
NSMutableArray *streamArray = [[NSMutableArray alloc] init];
for (int i = 0; i < jsonStreamArray.count; i++) {
NSDictionary *streamDictionary = [jsonStreamArray objectAtIndex:i];
[streamArray
addObject:[[StreamInformation alloc] init:streamDictionary]];
}
NSArray *jsonChapterArray =
[jsonDictionary objectForKey:MediaInformationJsonParserKeyChapters];
NSMutableArray *chapterArray = [[NSMutableArray alloc] init];
for (int i = 0; i < jsonChapterArray.count; i++) {
NSDictionary *chapterDictionary = [jsonChapterArray objectAtIndex:i];
[chapterArray addObject:[[Chapter alloc] init:chapterDictionary]];
}
return [[MediaInformation alloc] init:jsonDictionary
withStreams:streamArray
withChapters:chapterArray];
}
@end