diff options
Diffstat (limited to 'youtube_dl/downloader')
| -rw-r--r-- | youtube_dl/downloader/__init__.py | 3 | ||||
| -rw-r--r-- | youtube_dl/downloader/f4m.py | 305 |
2 files changed, 308 insertions, 0 deletions
diff --git a/youtube_dl/downloader/__init__.py b/youtube_dl/downloader/__init__.py index aaa92bc75..4ea5811a5 100644 --- a/youtube_dl/downloader/__init__.py +++ b/youtube_dl/downloader/__init__.py @@ -5,6 +5,7 @@ from .hls import HlsFD from .http import HttpFD from .mplayer import MplayerFD from .rtmp import RtmpFD +from .f4m import F4mFD from ..utils import ( determine_ext, @@ -22,5 +23,7 @@ def get_suitable_downloader(info_dict): return HlsFD if url.startswith('mms') or url.startswith('rtsp'): return MplayerFD + if determine_ext(url) == 'f4m': + return F4mFD else: return HttpFD diff --git a/youtube_dl/downloader/f4m.py b/youtube_dl/downloader/f4m.py new file mode 100644 index 000000000..9a6c03556 --- /dev/null +++ b/youtube_dl/downloader/f4m.py @@ -0,0 +1,305 @@ +from __future__ import unicode_literals + +import base64 +import io +import itertools +import os +from struct import unpack, pack +import time +import xml.etree.ElementTree as etree + +from .common import FileDownloader +from .http import HttpFD +from ..utils import ( + compat_urllib_request, + compat_urlparse, + format_bytes, + encodeFilename, + sanitize_open, +) + + +class FlvReader(io.BytesIO): + """ + Reader for Flv files + The file format is documented in https://www.adobe.com/devnet/f4v.html + """ + + # Utility functions for reading numbers and strings + def read_unsigned_long_long(self): + return unpack('!Q', self.read(8))[0] + + def read_unsigned_int(self): + return unpack('!I', self.read(4))[0] + + def read_unsigned_char(self): + return unpack('!B', self.read(1))[0] + + def read_string(self): + res = b'' + while True: + char = self.read(1) + if char == b'\x00': + break + res += char + return res + + def read_box_info(self): + """ + Read a box and return the info as a tuple: (box_size, box_type, box_data) + """ + real_size = size = self.read_unsigned_int() + box_type = self.read(4) + header_end = 8 + if size == 1: + real_size = self.read_unsigned_long_long() + header_end = 16 + return real_size, box_type, self.read(real_size-header_end) + + def read_asrt(self): + # version + self.read_unsigned_char() + # flags + self.read(3) + quality_entry_count = self.read_unsigned_char() + # QualityEntryCount + for i in range(quality_entry_count): + self.read_string() + + segment_run_count = self.read_unsigned_int() + segments = [] + for i in range(segment_run_count): + first_segment = self.read_unsigned_int() + fragments_per_segment = self.read_unsigned_int() + segments.append((first_segment, fragments_per_segment)) + + return { + 'segment_run': segments, + } + + def read_afrt(self): + # version + self.read_unsigned_char() + # flags + self.read(3) + # time scale + self.read_unsigned_int() + + quality_entry_count = self.read_unsigned_char() + # QualitySegmentUrlModifiers + for i in range(quality_entry_count): + self.read_string() + + fragments_count = self.read_unsigned_int() + fragments = [] + for i in range(fragments_count): + first = self.read_unsigned_int() + first_ts = self.read_unsigned_long_long() + duration = self.read_unsigned_int() + if duration == 0: + discontinuity_indicator = self.read_unsigned_char() + else: + discontinuity_indicator = None + fragments.append({ + 'first': first, + 'ts': first_ts, + 'duration': duration, + 'discontinuity_indicator': discontinuity_indicator, + }) + + return { + 'fragments': fragments, + } + + def read_abst(self): + # version + self.read_unsigned_char() + # flags + self.read(3) + # BootstrapinfoVersion + bootstrap_info_version = self.read_unsigned_int() + # Profile,Live,Update,Reserved + self.read(1) + # time scale + self.read_unsigned_int() + # CurrentMediaTime + self.read_unsigned_long_long() + # SmpteTimeCodeOffset + self.read_unsigned_long_long() + # MovieIdentifier + movie_identifier = self.read_string() + server_count = self.read_unsigned_char() + # ServerEntryTable + for i in range(server_count): + self.read_string() + quality_count = self.read_unsigned_char() + # QualityEntryTable + for i in range(server_count): + self.read_string() + # DrmData + self.read_string() + # MetaData + self.read_string() + + segments_count = self.read_unsigned_char() + segments = [] + for i in range(segments_count): + box_size, box_type, box_data = self.read_box_info() + assert box_type == b'asrt' + segment = FlvReader(box_data).read_asrt() + segments.append(segment) + fragments_run_count = self.read_unsigned_char() + fragments = [] + for i in range(fragments_run_count): + box_size, box_type, box_data = self.read_box_info() + assert box_type == b'afrt' + fragments.append(FlvReader(box_data).read_afrt()) + + return { + 'segments': segments, + 'fragments': fragments, + } + + def read_bootstrap_info(self): + total_size, box_type, box_data = self.read_box_info() + assert box_type == b'abst' + return FlvReader(box_data).read_abst() + + +def read_bootstrap_info(bootstrap_bytes): + return FlvReader(bootstrap_bytes).read_bootstrap_info() + + +def build_fragments_list(boot_info): + """ Return a list of (segment, fragment) for each fragment in the video """ + res = [] + segment_run_table = boot_info['segments'][0] + # I've only found videos with one segment + segment_run_entry = segment_run_table['segment_run'][0] + n_frags = segment_run_entry[1] + fragment_run_entry_table = boot_info['fragments'][0]['fragments'] + first_frag_number = fragment_run_entry_table[0]['first'] + for (i, frag_number) in zip(range(1, n_frags+1), itertools.count(first_frag_number)): + res.append((1, frag_number)) + return res + + +def write_flv_header(stream, metadata): + """Writes the FLV header and the metadata to stream""" + # FLV header + stream.write(b'FLV\x01') + stream.write(b'\x05') + stream.write(b'\x00\x00\x00\x09') + # FLV File body + stream.write(b'\x00\x00\x00\x00') + # FLVTAG + # Script data + stream.write(b'\x12') + # Size of the metadata with 3 bytes + stream.write(pack('!L', len(metadata))[1:]) + stream.write(b'\x00\x00\x00\x00\x00\x00\x00') + stream.write(metadata) + # Magic numbers extracted from the output files produced by AdobeHDS.php + #(https://github.com/K-S-V/Scripts) + stream.write(b'\x00\x00\x01\x73') + + +def _add_ns(prop): + return '{http://ns.adobe.com/f4m/1.0}%s' % prop + + +class HttpQuietDownloader(HttpFD): + def to_screen(self, *args, **kargs): + pass + + +class F4mFD(FileDownloader): + """ + A downloader for f4m manifests or AdobeHDS. + """ + + def real_download(self, filename, info_dict): + man_url = info_dict['url'] + self.to_screen('[download] Downloading f4m manifest') + manifest = self.ydl.urlopen(man_url).read() + self.report_destination(filename) + http_dl = HttpQuietDownloader(self.ydl, {'continuedl': True, 'quiet': True, 'noprogress': True}) + + doc = etree.fromstring(manifest) + formats = [(int(f.attrib.get('bitrate', -1)), f) for f in doc.findall(_add_ns('media'))] + formats = sorted(formats, key=lambda f: f[0]) + rate, media = formats[-1] + base_url = compat_urlparse.urljoin(man_url, media.attrib['url']) + bootstrap = base64.b64decode(doc.find(_add_ns('bootstrapInfo')).text) + metadata = base64.b64decode(media.find(_add_ns('metadata')).text) + boot_info = read_bootstrap_info(bootstrap) + fragments_list = build_fragments_list(boot_info) + total_frags = len(fragments_list) + + tmpfilename = self.temp_name(filename) + (dest_stream, tmpfilename) = sanitize_open(tmpfilename, 'wb') + write_flv_header(dest_stream, metadata) + + # This dict stores the download progress, it's updated by the progress + # hook + state = { + 'downloaded_bytes': 0, + 'frag_counter': 0, + } + start = time.time() + + def frag_progress_hook(status): + frag_total_bytes = status.get('total_bytes', 0) + estimated_size = (state['downloaded_bytes'] + + (total_frags - state['frag_counter']) * frag_total_bytes) + if status['status'] == 'finished': + state['downloaded_bytes'] += frag_total_bytes + state['frag_counter'] += 1 + progress = self.calc_percent(state['frag_counter'], total_frags) + byte_counter = state['downloaded_bytes'] + else: + frag_downloaded_bytes = status['downloaded_bytes'] + byte_counter = state['downloaded_bytes'] + frag_downloaded_bytes + frag_progress = self.calc_percent(frag_downloaded_bytes, + frag_total_bytes) + progress = self.calc_percent(state['frag_counter'], total_frags) + progress += frag_progress / float(total_frags) + + eta = self.calc_eta(start, time.time(), estimated_size, byte_counter) + self.report_progress(progress, format_bytes(estimated_size), + status.get('speed'), eta) + http_dl.add_progress_hook(frag_progress_hook) + + frags_filenames = [] + for (seg_i, frag_i) in fragments_list: + name = 'Seg%d-Frag%d' % (seg_i, frag_i) + url = base_url + name + frag_filename = '%s-%s' % (tmpfilename, name) + success = http_dl.download(frag_filename, {'url': url}) + if not success: + return False + with open(frag_filename, 'rb') as down: + down_data = down.read() + reader = FlvReader(down_data) + while True: + _, box_type, box_data = reader.read_box_info() + if box_type == b'mdat': + dest_stream.write(box_data) + break + frags_filenames.append(frag_filename) + + self.report_finish(format_bytes(state['downloaded_bytes']), time.time() - start) + + self.try_rename(tmpfilename, filename) + for frag_file in frags_filenames: + os.remove(frag_file) + + fsize = os.path.getsize(encodeFilename(filename)) + self._hook_progress({ + 'downloaded_bytes': fsize, + 'total_bytes': fsize, + 'filename': filename, + 'status': 'finished', + }) + + return True |