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[downloader/fragment] Improve .ytdl format and start documenting
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@ -31,6 +31,24 @@ class FragmentFD(FileDownloader):
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Skip unavailable fragments (DASH and hlsnative only)
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keep_fragments: Keep downloaded fragments on disk after downloading is
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finished
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For each incomplete fragment download youtube-dl keeps on disk a special
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bookkeeping file with download state and metadata (in future such files will
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be used for any incomplete download handled by youtube-dl). This file is
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used to properly handle resuming, check download file consistency and detect
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potential errors. The file has a .ytdl extension and represents a standard
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JSON file of the following format:
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extractor:
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Dictionary of extractor related data. TBD.
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downloader:
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Dictionary of downloader related data. May contain following data:
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current_fragment:
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Dictionary with current (being downloaded) fragment data:
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index: Index of current fragment among all fragments
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fragment_count:
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Total count of fragments
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"""
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def report_retry_fragment(self, err, frag_index, count, retries):
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@ -55,16 +73,19 @@ def __do_ytdl_file(ctx):
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def _read_ytdl_file(self, ctx):
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stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'r')
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ctx['fragment_index'] = json.loads(stream.read())['download']['current_fragment_index']
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ctx['fragment_index'] = json.loads(stream.read())['downloader']['current_fragment']['index']
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stream.close()
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def _write_ytdl_file(self, ctx):
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frag_index_stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'w')
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frag_index_stream.write(json.dumps({
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'download': {
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'current_fragment_index': ctx['fragment_index']
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downloader = {
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'current_fragment': {
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'index': ctx['fragment_index'],
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},
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}))
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}
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if ctx.get('fragment_count') is not None:
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downloader['fragment_count'] = ctx['fragment_count']
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frag_index_stream.write(json.dumps({'downloader': downloader}))
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frag_index_stream.close()
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def _download_fragment(self, ctx, frag_url, info_dict, headers=None):
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