使用Photos框架从图库上传视频 [英] Upload videos from gallery using Photos framework

问题描述

使用Photos框架从图库上传视频的最佳方法是什么？
之前我使用ALAssetRepresentation和下一个方法：

What is the best way to upload videos from gallery using Photos framework? Before I used ALAssetRepresentation and next method:

- (NSUInteger)getBytes:(uint8_t *)buffer fromOffset:(long long)offset length:(NSUInteger)length error:(NSError **)error;

这允许上传文件而不先将其复制到app临时目录。在Photos框架中看不到任何替代方案。唯一的方法似乎是使用AVAssetExportSession - >导出到本地目录 - >上传，但这需要额外的存储空间（如果视频太大可能有问题）

this allowed to upload file without first copying it to app temp directory. Don’t see any alternatives in Photos framework. Only way seems to use AVAssetExportSession -> export to local directory -> upload, but this requires additional storage space (could be a problem, if video is too big)

推荐答案

似乎唯一有效的方法是从 PHImageManager 请求 AVAsset ，并检查是否返回的资产是 AVURLAsset 。在这种情况下，URL可用于直接访问文件并获取所需的字节块：

Seems the only valid way is to request AVAsset from PHImageManager, and check if returned asset is AVURLAsset. In this case URL can be used to directly access file and get needed chunk of bytes:

[[PHImageManager defaultManager] requestAVAssetForVideo:videoAsset options:nil resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
  if ([asset isKindOfClass:[AVURLAsset class]]) {
    NSURL *URL = [(AVURLAsset *)asset URL];
    // use URL to get file content
  }
}];

这不适用于慢动作视频，因为 AVComposition 而不是 AVURLAsset 。可能的解决方案是使用 PHVideoRequestOptionsVersionOriginal 视频文件版本：

This will not work with slow motion videos, because AVComposition instead of AVURLAsset is returned. Possible solution is to use PHVideoRequestOptionsVersionOriginal video file version:

PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
options.version = PHVideoRequestOptionsVersionOriginal;

[[PHImageManager defaultManager] requestAVAssetForVideo:videoAsset options:options resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
  if ([asset isKindOfClass:[AVURLAsset class]]) {
    NSURL *URL = [(AVURLAsset *)asset URL];
    // use URL to get file content
  }
}];

并获得全尺寸图片网址：

And to get fullsize image url:

PHContentEditingInputRequestOptions *options = [[PHContentEditingInputRequestOptions alloc] init];
options.canHandleAdjustmentData = ^BOOL(PHAdjustmentData *adjustmentData) {
  return YES;
};

[imageAsset requestContentEditingInputWithOptions:options completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
  // use contentEditingInput.fullSizeImageURL
}];

这篇关于使用Photos框架从图库上传视频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！