diff options
Diffstat (limited to 'youtube_dl/downloader/fragment.py')
| -rw-r--r-- | youtube_dl/downloader/fragment.py | 122 |
1 files changed, 109 insertions, 13 deletions
diff --git a/youtube_dl/downloader/fragment.py b/youtube_dl/downloader/fragment.py index 56f975266..bccc8ecc1 100644 --- a/youtube_dl/downloader/fragment.py +++ b/youtube_dl/downloader/fragment.py @@ -2,6 +2,7 @@ from __future__ import division, unicode_literals import os import time +import json from .common import FileDownloader from .http import HttpFD @@ -28,15 +29,37 @@ class FragmentFD(FileDownloader): and hlsnative only) skip_unavailable_fragments: Skip unavailable fragments (DASH and hlsnative only) + keep_fragments: Keep downloaded fragments on disk after downloading is + 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: 0-based index of current fragment among all fragments + fragment_count: + Total count of fragments + + This feature is experimental and file format may change in future. """ - def report_retry_fragment(self, err, fragment_name, count, retries): + def report_retry_fragment(self, err, frag_index, count, retries): self.to_screen( - '[download] Got server HTTP error: %s. Retrying fragment %s (attempt %d of %s)...' - % (error_to_compat_str(err), fragment_name, count, self.format_retries(retries))) + '[download] Got server HTTP error: %s. Retrying fragment %d (attempt %d of %s)...' + % (error_to_compat_str(err), frag_index, count, self.format_retries(retries))) - def report_skip_fragment(self, fragment_name): - self.to_screen('[download] Skipping fragment %s...' % fragment_name) + def report_skip_fragment(self, frag_index): + self.to_screen('[download] Skipping fragment %d...' % frag_index) def _prepare_url(self, info_dict, url): headers = info_dict.get('http_headers') @@ -46,6 +69,51 @@ class FragmentFD(FileDownloader): self._prepare_frag_download(ctx) self._start_frag_download(ctx) + @staticmethod + def __do_ytdl_file(ctx): + return not ctx['live'] and not ctx['tmpfilename'] == '-' + + def _read_ytdl_file(self, ctx): + stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'r') + ctx['fragment_index'] = json.loads(stream.read())['downloader']['current_fragment']['index'] + stream.close() + + def _write_ytdl_file(self, ctx): + frag_index_stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'w') + downloader = { + 'current_fragment': { + '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() + + def _download_fragment(self, ctx, frag_url, info_dict, headers=None): + fragment_filename = '%s-Frag%d' % (ctx['tmpfilename'], ctx['fragment_index']) + success = ctx['dl'].download(fragment_filename, { + 'url': frag_url, + 'http_headers': headers or info_dict.get('http_headers'), + }) + if not success: + return False, None + down, frag_sanitized = sanitize_open(fragment_filename, 'rb') + ctx['fragment_filename_sanitized'] = frag_sanitized + frag_content = down.read() + down.close() + return True, frag_content + + def _append_fragment(self, ctx, frag_content): + try: + ctx['dest_stream'].write(frag_content) + finally: + if self.__do_ytdl_file(ctx): + self._write_ytdl_file(ctx) + if not self.params.get('keep_fragments', False): + os.remove(ctx['fragment_filename_sanitized']) + del ctx['fragment_filename_sanitized'] + def _prepare_frag_download(self, ctx): if 'live' not in ctx: ctx['live'] = False @@ -66,11 +134,36 @@ class FragmentFD(FileDownloader): } ) tmpfilename = self.temp_name(ctx['filename']) - dest_stream, tmpfilename = sanitize_open(tmpfilename, 'wb') + open_mode = 'wb' + resume_len = 0 + + # Establish possible resume length + if os.path.isfile(encodeFilename(tmpfilename)): + open_mode = 'ab' + resume_len = os.path.getsize(encodeFilename(tmpfilename)) + + # Should be initialized before ytdl file check + ctx.update({ + 'tmpfilename': tmpfilename, + 'fragment_index': 0, + }) + + if self.__do_ytdl_file(ctx): + if os.path.isfile(encodeFilename(self.ytdl_filename(ctx['filename']))): + self._read_ytdl_file(ctx) + else: + self._write_ytdl_file(ctx) + if ctx['fragment_index'] > 0: + assert resume_len > 0 + + dest_stream, tmpfilename = sanitize_open(tmpfilename, open_mode) + ctx.update({ 'dl': dl, 'dest_stream': dest_stream, 'tmpfilename': tmpfilename, + # Total complete fragments downloaded so far in bytes + 'complete_frags_downloaded_bytes': resume_len, }) def _start_frag_download(self, ctx): @@ -79,9 +172,9 @@ class FragmentFD(FileDownloader): # hook state = { 'status': 'downloading', - 'downloaded_bytes': 0, - 'frag_index': 0, - 'frag_count': total_frags, + 'downloaded_bytes': ctx['complete_frags_downloaded_bytes'], + 'fragment_index': ctx['fragment_index'], + 'fragment_count': total_frags, 'filename': ctx['filename'], 'tmpfilename': ctx['tmpfilename'], } @@ -89,8 +182,6 @@ class FragmentFD(FileDownloader): start = time.time() ctx.update({ 'started': start, - # Total complete fragments downloaded so far in bytes - 'complete_frags_downloaded_bytes': 0, # Amount of fragment's bytes downloaded by the time of the previous # frag progress hook invocation 'prev_frag_downloaded_bytes': 0, @@ -106,11 +197,12 @@ class FragmentFD(FileDownloader): if not ctx['live']: estimated_size = ( (ctx['complete_frags_downloaded_bytes'] + frag_total_bytes) / - (state['frag_index'] + 1) * total_frags) + (state['fragment_index'] + 1) * total_frags) state['total_bytes_estimate'] = estimated_size if s['status'] == 'finished': - state['frag_index'] += 1 + state['fragment_index'] += 1 + ctx['fragment_index'] = state['fragment_index'] state['downloaded_bytes'] += frag_total_bytes - ctx['prev_frag_downloaded_bytes'] ctx['complete_frags_downloaded_bytes'] = state['downloaded_bytes'] ctx['prev_frag_downloaded_bytes'] = 0 @@ -132,6 +224,10 @@ class FragmentFD(FileDownloader): def _finish_frag_download(self, ctx): ctx['dest_stream'].close() + if self.__do_ytdl_file(ctx): + ytdl_filename = encodeFilename(self.ytdl_filename(ctx['filename'])) + if os.path.isfile(ytdl_filename): + os.remove(ytdl_filename) elapsed = time.time() - ctx['started'] self.try_rename(ctx['tmpfilename'], ctx['filename']) fsize = os.path.getsize(encodeFilename(ctx['filename'])) |