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[downloader/fragment] Improve .ytdl format and start documenting

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Sergey M․ 2017-04-24 23:50:20 +07:00
parent adb4b03cd5
commit 290f64dbaa
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1 changed files with 26 additions and 5 deletions
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31
youtube_dl/downloader/fragment.py
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@ -31,6 +31,24 @@ class FragmentFD(FileDownloader):
Skip unavailable fragments (DASH and hlsnative only) Skip unavailable fragments (DASH and hlsnative only)
keep_fragments: Keep downloaded fragments on disk after downloading is keep_fragments: Keep downloaded fragments on disk after downloading is
finished finished
For each incomplete fragment download youtube-dl keeps on disk a special
bookkeeping file with download state and metadata (in future such files will
be used for any incomplete download handled by youtube-dl). This file is
used to properly handle resuming, check download file consistency and detect
potential errors. The file has a .ytdl extension and represents a standard
JSON file of the following format:
extractor:
Dictionary of extractor related data. TBD.
downloader:
Dictionary of downloader related data. May contain following data:
current_fragment:
Dictionary with current (being downloaded) fragment data:
index: Index of current fragment among all fragments
fragment_count:
Total count of fragments
""" """
def report_retry_fragment(self, err, frag_index, count, retries): def report_retry_fragment(self, err, frag_index, count, retries):
@ -55,16 +73,19 @@ class FragmentFD(FileDownloader):
def _read_ytdl_file(self, ctx): def _read_ytdl_file(self, ctx):
stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'r') stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'r')
ctx['fragment_index'] = json.loads(stream.read())['download']['current_fragment_index'] ctx['fragment_index'] = json.loads(stream.read())['downloader']['current_fragment']['index']
stream.close() stream.close()
def _write_ytdl_file(self, ctx): def _write_ytdl_file(self, ctx):
frag_index_stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'w') frag_index_stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'w')
frag_index_stream.write(json.dumps({ downloader = {
'download': { 'current_fragment': {
'current_fragment_index': ctx['fragment_index'] 'index': ctx['fragment_index'],
}, },
})) }
if ctx.get('fragment_count') is not None:
downloader['fragment_count'] = ctx['fragment_count']
frag_index_stream.write(json.dumps({'downloader': downloader}))
frag_index_stream.close() frag_index_stream.close()
def _download_fragment(self, ctx, frag_url, info_dict, headers=None): def _download_fragment(self, ctx, frag_url, info_dict, headers=None):