diff options
Diffstat (limited to 'yt_dlp/downloader/ism.py')
| -rw-r--r-- | yt_dlp/downloader/ism.py | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/yt_dlp/downloader/ism.py b/yt_dlp/downloader/ism.py new file mode 100644 index 0000000..a157a8a --- /dev/null +++ b/yt_dlp/downloader/ism.py @@ -0,0 +1,283 @@ +import binascii +import io +import struct +import time +import urllib.error + +from .fragment import FragmentFD +from ..utils import RetryManager + +u8 = struct.Struct('>B') +u88 = struct.Struct('>Bx') +u16 = struct.Struct('>H') +u1616 = struct.Struct('>Hxx') +u32 = struct.Struct('>I') +u64 = struct.Struct('>Q') + +s88 = struct.Struct('>bx') +s16 = struct.Struct('>h') +s1616 = struct.Struct('>hxx') +s32 = struct.Struct('>i') + +unity_matrix = (s32.pack(0x10000) + s32.pack(0) * 3) * 2 + s32.pack(0x40000000) + +TRACK_ENABLED = 0x1 +TRACK_IN_MOVIE = 0x2 +TRACK_IN_PREVIEW = 0x4 + +SELF_CONTAINED = 0x1 + + +def box(box_type, payload): + return u32.pack(8 + len(payload)) + box_type + payload + + +def full_box(box_type, version, flags, payload): + return box(box_type, u8.pack(version) + u32.pack(flags)[1:] + payload) + + +def write_piff_header(stream, params): + track_id = params['track_id'] + fourcc = params['fourcc'] + duration = params['duration'] + timescale = params.get('timescale', 10000000) + language = params.get('language', 'und') + height = params.get('height', 0) + width = params.get('width', 0) + stream_type = params['stream_type'] + creation_time = modification_time = int(time.time()) + + ftyp_payload = b'isml' # major brand + ftyp_payload += u32.pack(1) # minor version + ftyp_payload += b'piff' + b'iso2' # compatible brands + stream.write(box(b'ftyp', ftyp_payload)) # File Type Box + + mvhd_payload = u64.pack(creation_time) + mvhd_payload += u64.pack(modification_time) + mvhd_payload += u32.pack(timescale) + mvhd_payload += u64.pack(duration) + mvhd_payload += s1616.pack(1) # rate + mvhd_payload += s88.pack(1) # volume + mvhd_payload += u16.pack(0) # reserved + mvhd_payload += u32.pack(0) * 2 # reserved + mvhd_payload += unity_matrix + mvhd_payload += u32.pack(0) * 6 # pre defined + mvhd_payload += u32.pack(0xffffffff) # next track id + moov_payload = full_box(b'mvhd', 1, 0, mvhd_payload) # Movie Header Box + + tkhd_payload = u64.pack(creation_time) + tkhd_payload += u64.pack(modification_time) + tkhd_payload += u32.pack(track_id) # track id + tkhd_payload += u32.pack(0) # reserved + tkhd_payload += u64.pack(duration) + tkhd_payload += u32.pack(0) * 2 # reserved + tkhd_payload += s16.pack(0) # layer + tkhd_payload += s16.pack(0) # alternate group + tkhd_payload += s88.pack(1 if stream_type == 'audio' else 0) # volume + tkhd_payload += u16.pack(0) # reserved + tkhd_payload += unity_matrix + tkhd_payload += u1616.pack(width) + tkhd_payload += u1616.pack(height) + trak_payload = full_box(b'tkhd', 1, TRACK_ENABLED | TRACK_IN_MOVIE | TRACK_IN_PREVIEW, tkhd_payload) # Track Header Box + + mdhd_payload = u64.pack(creation_time) + mdhd_payload += u64.pack(modification_time) + mdhd_payload += u32.pack(timescale) + mdhd_payload += u64.pack(duration) + mdhd_payload += u16.pack(((ord(language[0]) - 0x60) << 10) | ((ord(language[1]) - 0x60) << 5) | (ord(language[2]) - 0x60)) + mdhd_payload += u16.pack(0) # pre defined + mdia_payload = full_box(b'mdhd', 1, 0, mdhd_payload) # Media Header Box + + hdlr_payload = u32.pack(0) # pre defined + if stream_type == 'audio': # handler type + hdlr_payload += b'soun' + hdlr_payload += u32.pack(0) * 3 # reserved + hdlr_payload += b'SoundHandler\0' # name + elif stream_type == 'video': + hdlr_payload += b'vide' + hdlr_payload += u32.pack(0) * 3 # reserved + hdlr_payload += b'VideoHandler\0' # name + elif stream_type == 'text': + hdlr_payload += b'subt' + hdlr_payload += u32.pack(0) * 3 # reserved + hdlr_payload += b'SubtitleHandler\0' # name + else: + assert False + mdia_payload += full_box(b'hdlr', 0, 0, hdlr_payload) # Handler Reference Box + + if stream_type == 'audio': + smhd_payload = s88.pack(0) # balance + smhd_payload += u16.pack(0) # reserved + media_header_box = full_box(b'smhd', 0, 0, smhd_payload) # Sound Media Header + elif stream_type == 'video': + vmhd_payload = u16.pack(0) # graphics mode + vmhd_payload += u16.pack(0) * 3 # opcolor + media_header_box = full_box(b'vmhd', 0, 1, vmhd_payload) # Video Media Header + elif stream_type == 'text': + media_header_box = full_box(b'sthd', 0, 0, b'') # Subtitle Media Header + else: + assert False + minf_payload = media_header_box + + dref_payload = u32.pack(1) # entry count + dref_payload += full_box(b'url ', 0, SELF_CONTAINED, b'') # Data Entry URL Box + dinf_payload = full_box(b'dref', 0, 0, dref_payload) # Data Reference Box + minf_payload += box(b'dinf', dinf_payload) # Data Information Box + + stsd_payload = u32.pack(1) # entry count + + sample_entry_payload = u8.pack(0) * 6 # reserved + sample_entry_payload += u16.pack(1) # data reference index + if stream_type == 'audio': + sample_entry_payload += u32.pack(0) * 2 # reserved + sample_entry_payload += u16.pack(params.get('channels', 2)) + sample_entry_payload += u16.pack(params.get('bits_per_sample', 16)) + sample_entry_payload += u16.pack(0) # pre defined + sample_entry_payload += u16.pack(0) # reserved + sample_entry_payload += u1616.pack(params['sampling_rate']) + + if fourcc == 'AACL': + sample_entry_box = box(b'mp4a', sample_entry_payload) + if fourcc == 'EC-3': + sample_entry_box = box(b'ec-3', sample_entry_payload) + elif stream_type == 'video': + sample_entry_payload += u16.pack(0) # pre defined + sample_entry_payload += u16.pack(0) # reserved + sample_entry_payload += u32.pack(0) * 3 # pre defined + sample_entry_payload += u16.pack(width) + sample_entry_payload += u16.pack(height) + sample_entry_payload += u1616.pack(0x48) # horiz resolution 72 dpi + sample_entry_payload += u1616.pack(0x48) # vert resolution 72 dpi + sample_entry_payload += u32.pack(0) # reserved + sample_entry_payload += u16.pack(1) # frame count + sample_entry_payload += u8.pack(0) * 32 # compressor name + sample_entry_payload += u16.pack(0x18) # depth + sample_entry_payload += s16.pack(-1) # pre defined + + codec_private_data = binascii.unhexlify(params['codec_private_data'].encode()) + if fourcc in ('H264', 'AVC1'): + sps, pps = codec_private_data.split(u32.pack(1))[1:] + avcc_payload = u8.pack(1) # configuration version + avcc_payload += sps[1:4] # avc profile indication + profile compatibility + avc level indication + avcc_payload += u8.pack(0xfc | (params.get('nal_unit_length_field', 4) - 1)) # complete representation (1) + reserved (11111) + length size minus one + avcc_payload += u8.pack(1) # reserved (0) + number of sps (0000001) + avcc_payload += u16.pack(len(sps)) + avcc_payload += sps + avcc_payload += u8.pack(1) # number of pps + avcc_payload += u16.pack(len(pps)) + avcc_payload += pps + sample_entry_payload += box(b'avcC', avcc_payload) # AVC Decoder Configuration Record + sample_entry_box = box(b'avc1', sample_entry_payload) # AVC Simple Entry + else: + assert False + elif stream_type == 'text': + if fourcc == 'TTML': + sample_entry_payload += b'http://www.w3.org/ns/ttml\0' # namespace + sample_entry_payload += b'\0' # schema location + sample_entry_payload += b'\0' # auxilary mime types(??) + sample_entry_box = box(b'stpp', sample_entry_payload) + else: + assert False + else: + assert False + stsd_payload += sample_entry_box + + stbl_payload = full_box(b'stsd', 0, 0, stsd_payload) # Sample Description Box + + stts_payload = u32.pack(0) # entry count + stbl_payload += full_box(b'stts', 0, 0, stts_payload) # Decoding Time to Sample Box + + stsc_payload = u32.pack(0) # entry count + stbl_payload += full_box(b'stsc', 0, 0, stsc_payload) # Sample To Chunk Box + + stco_payload = u32.pack(0) # entry count + stbl_payload += full_box(b'stco', 0, 0, stco_payload) # Chunk Offset Box + + minf_payload += box(b'stbl', stbl_payload) # Sample Table Box + + mdia_payload += box(b'minf', minf_payload) # Media Information Box + + trak_payload += box(b'mdia', mdia_payload) # Media Box + + moov_payload += box(b'trak', trak_payload) # Track Box + + mehd_payload = u64.pack(duration) + mvex_payload = full_box(b'mehd', 1, 0, mehd_payload) # Movie Extends Header Box + + trex_payload = u32.pack(track_id) # track id + trex_payload += u32.pack(1) # default sample description index + trex_payload += u32.pack(0) # default sample duration + trex_payload += u32.pack(0) # default sample size + trex_payload += u32.pack(0) # default sample flags + mvex_payload += full_box(b'trex', 0, 0, trex_payload) # Track Extends Box + + moov_payload += box(b'mvex', mvex_payload) # Movie Extends Box + stream.write(box(b'moov', moov_payload)) # Movie Box + + +def extract_box_data(data, box_sequence): + data_reader = io.BytesIO(data) + while True: + box_size = u32.unpack(data_reader.read(4))[0] + box_type = data_reader.read(4) + if box_type == box_sequence[0]: + box_data = data_reader.read(box_size - 8) + if len(box_sequence) == 1: + return box_data + return extract_box_data(box_data, box_sequence[1:]) + data_reader.seek(box_size - 8, 1) + + +class IsmFD(FragmentFD): + """ + Download segments in a ISM manifest + """ + + def real_download(self, filename, info_dict): + segments = info_dict['fragments'][:1] if self.params.get( + 'test', False) else info_dict['fragments'] + + ctx = { + 'filename': filename, + 'total_frags': len(segments), + } + + self._prepare_and_start_frag_download(ctx, info_dict) + + extra_state = ctx.setdefault('extra_state', { + 'ism_track_written': False, + }) + + skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True) + + frag_index = 0 + for i, segment in enumerate(segments): + frag_index += 1 + if frag_index <= ctx['fragment_index']: + continue + + retry_manager = RetryManager(self.params.get('fragment_retries'), self.report_retry, + frag_index=frag_index, fatal=not skip_unavailable_fragments) + for retry in retry_manager: + try: + success = self._download_fragment(ctx, segment['url'], info_dict) + if not success: + return False + frag_content = self._read_fragment(ctx) + + if not extra_state['ism_track_written']: + tfhd_data = extract_box_data(frag_content, [b'moof', b'traf', b'tfhd']) + info_dict['_download_params']['track_id'] = u32.unpack(tfhd_data[4:8])[0] + write_piff_header(ctx['dest_stream'], info_dict['_download_params']) + extra_state['ism_track_written'] = True + self._append_fragment(ctx, frag_content) + except urllib.error.HTTPError as err: + retry.error = err + continue + + if retry_manager.error: + if not skip_unavailable_fragments: + return False + self.report_skip_fragment(frag_index) + + return self._finish_frag_download(ctx, info_dict) |