Raphaël G. Git Repositories - youtubedl/blob - youtube_dl/downloader/ism.py

   1 from __future__ import unicode_literals
   2
   3 import time
   4 import struct
   5 import binascii
   6 import io
   7
   8 from .fragment import FragmentFD
   9 from ..compat import compat_urllib_error
  10
  11
  12 u8 = struct.Struct(b'>B')
  13 u88 = struct.Struct(b'>Bx')
  14 u16 = struct.Struct(b'>H')
  15 u1616 = struct.Struct(b'>Hxx')
  16 u32 = struct.Struct(b'>I')
  17 u64 = struct.Struct(b'>Q')
  18
  19 s88 = struct.Struct(b'>bx')
  20 s16 = struct.Struct(b'>h')
  21 s1616 = struct.Struct(b'>hxx')
  22 s32 = struct.Struct(b'>i')
  23
  24 unity_matrix = (s32.pack(0x10000) + s32.pack(0) * 3) * 2 + s32.pack(0x40000000)
  25
  26 TRACK_ENABLED = 0x1
  27 TRACK_IN_MOVIE = 0x2
  28 TRACK_IN_PREVIEW = 0x4
  29
  30 SELF_CONTAINED = 0x1
  31
  32
  33 def box(box_type, payload):
  34     return u32.pack(8 + len(payload)) + box_type + payload
  35
  36
  37 def full_box(box_type, version, flags, payload):
  38     return box(box_type, u8.pack(version) + u32.pack(flags)[1:] + payload)
  39
  40
  41 def write_piff_header(stream, params):
  42     track_id = params['track_id']
  43     fourcc = params['fourcc']
  44     duration = params['duration']
  45     timescale = params.get('timescale', 10000000)
  46     language = params.get('language', 'und')
  47     height = params.get('height', 0)
  48     width = params.get('width', 0)
  49     is_audio = width == 0 and height == 0
  50     creation_time = modification_time = int(time.time())
  51
  52     ftyp_payload = b'isml'  # major brand
  53     ftyp_payload += u32.pack(1)  # minor version
  54     ftyp_payload += b'piff' + b'iso2'  # compatible brands
  55     stream.write(box(b'ftyp', ftyp_payload))  # File Type Box
  56
  57     mvhd_payload = u64.pack(creation_time)
  58     mvhd_payload += u64.pack(modification_time)
  59     mvhd_payload += u32.pack(timescale)
  60     mvhd_payload += u64.pack(duration)
  61     mvhd_payload += s1616.pack(1)  # rate
  62     mvhd_payload += s88.pack(1)  # volume
  63     mvhd_payload += u16.pack(0)  # reserved
  64     mvhd_payload += u32.pack(0) * 2  # reserved
  65     mvhd_payload += unity_matrix
  66     mvhd_payload += u32.pack(0) * 6  # pre defined
  67     mvhd_payload += u32.pack(0xffffffff)  # next track id
  68     moov_payload = full_box(b'mvhd', 1, 0, mvhd_payload)  # Movie Header Box
  69
  70     tkhd_payload = u64.pack(creation_time)
  71     tkhd_payload += u64.pack(modification_time)
  72     tkhd_payload += u32.pack(track_id)  # track id
  73     tkhd_payload += u32.pack(0)  # reserved
  74     tkhd_payload += u64.pack(duration)
  75     tkhd_payload += u32.pack(0) * 2  # reserved
  76     tkhd_payload += s16.pack(0)  # layer
  77     tkhd_payload += s16.pack(0)  # alternate group
  78     tkhd_payload += s88.pack(1 if is_audio else 0)  # volume
  79     tkhd_payload += u16.pack(0)  # reserved
  80     tkhd_payload += unity_matrix
  81     tkhd_payload += u1616.pack(width)
  82     tkhd_payload += u1616.pack(height)
  83     trak_payload = full_box(b'tkhd', 1, TRACK_ENABLED | TRACK_IN_MOVIE | TRACK_IN_PREVIEW, tkhd_payload)  # Track Header Box
  84
  85     mdhd_payload = u64.pack(creation_time)
  86     mdhd_payload += u64.pack(modification_time)
  87     mdhd_payload += u32.pack(timescale)
  88     mdhd_payload += u64.pack(duration)
  89     mdhd_payload += u16.pack(((ord(language[0]) - 0x60) << 10) | ((ord(language[1]) - 0x60) << 5) | (ord(language[2]) - 0x60))
  90     mdhd_payload += u16.pack(0)  # pre defined
  91     mdia_payload = full_box(b'mdhd', 1, 0, mdhd_payload)  # Media Header Box
  92
  93     hdlr_payload = u32.pack(0)  # pre defined
  94     hdlr_payload += b'soun' if is_audio else b'vide'  # handler type
  95     hdlr_payload += u32.pack(0) * 3  # reserved
  96     hdlr_payload += (b'Sound' if is_audio else b'Video') + b'Handler\0'  # name
  97     mdia_payload += full_box(b'hdlr', 0, 0, hdlr_payload)  # Handler Reference Box
  98
  99     if is_audio:
 100         smhd_payload = s88.pack(0)  # balance
 101         smhd_payload += u16.pack(0)  # reserved
 102         media_header_box = full_box(b'smhd', 0, 0, smhd_payload)  # Sound Media Header
 103     else:
 104         vmhd_payload = u16.pack(0)  # graphics mode
 105         vmhd_payload += u16.pack(0) * 3  # opcolor
 106         media_header_box = full_box(b'vmhd', 0, 1, vmhd_payload)  # Video Media Header
 107     minf_payload = media_header_box
 108
 109     dref_payload = u32.pack(1)  # entry count
 110     dref_payload += full_box(b'url ', 0, SELF_CONTAINED, b'')  # Data Entry URL Box
 111     dinf_payload = full_box(b'dref', 0, 0, dref_payload)  # Data Reference Box
 112     minf_payload += box(b'dinf', dinf_payload)  # Data Information Box
 113
 114     stsd_payload = u32.pack(1)  # entry count
 115
 116     sample_entry_payload = u8.pack(0) * 6  # reserved
 117     sample_entry_payload += u16.pack(1)  # data reference index
 118     if is_audio:
 119         sample_entry_payload += u32.pack(0) * 2  # reserved
 120         sample_entry_payload += u16.pack(params.get('channels', 2))
 121         sample_entry_payload += u16.pack(params.get('bits_per_sample', 16))
 122         sample_entry_payload += u16.pack(0)  # pre defined
 123         sample_entry_payload += u16.pack(0)  # reserved
 124         sample_entry_payload += u1616.pack(params['sampling_rate'])
 125
 126         if fourcc == 'AACL':
 127             sample_entry_box = box(b'mp4a', sample_entry_payload)
 128     else:
 129         sample_entry_payload += u16.pack(0)  # pre defined
 130         sample_entry_payload += u16.pack(0)  # reserved
 131         sample_entry_payload += u32.pack(0) * 3  # pre defined
 132         sample_entry_payload += u16.pack(width)
 133         sample_entry_payload += u16.pack(height)
 134         sample_entry_payload += u1616.pack(0x48)  # horiz resolution 72 dpi
 135         sample_entry_payload += u1616.pack(0x48)  # vert resolution 72 dpi
 136         sample_entry_payload += u32.pack(0)  # reserved
 137         sample_entry_payload += u16.pack(1)  # frame count
 138         sample_entry_payload += u8.pack(0) * 32  # compressor name
 139         sample_entry_payload += u16.pack(0x18)  # depth
 140         sample_entry_payload += s16.pack(-1)  # pre defined
 141
 142         codec_private_data = binascii.unhexlify(params['codec_private_data'])
 143         if fourcc in ('H264', 'AVC1'):
 144             sps, pps = codec_private_data.split(u32.pack(1))[1:]
 145             avcc_payload = u8.pack(1)  # configuration version
 146             avcc_payload += sps[1:4]  # avc profile indication + profile compatibility + avc level indication
 147             avcc_payload += u8.pack(0xfc | (params.get('nal_unit_length_field', 4) - 1))  # complete represenation (1) + reserved (11111) + length size minus one
 148             avcc_payload += u8.pack(1)  # reserved (0) + number of sps (0000001)
 149             avcc_payload += u16.pack(len(sps))
 150             avcc_payload += sps
 151             avcc_payload += u8.pack(1)  # number of pps
 152             avcc_payload += u16.pack(len(pps))
 153             avcc_payload += pps
 154             sample_entry_payload += box(b'avcC', avcc_payload)  # AVC Decoder Configuration Record
 155             sample_entry_box = box(b'avc1', sample_entry_payload)  # AVC Simple Entry
 156     stsd_payload += sample_entry_box
 157
 158     stbl_payload = full_box(b'stsd', 0, 0, stsd_payload)  # Sample Description Box
 159
 160     stts_payload = u32.pack(0)  # entry count
 161     stbl_payload += full_box(b'stts', 0, 0, stts_payload)  # Decoding Time to Sample Box
 162
 163     stsc_payload = u32.pack(0)  # entry count
 164     stbl_payload += full_box(b'stsc', 0, 0, stsc_payload)  # Sample To Chunk Box
 165
 166     stco_payload = u32.pack(0)  # entry count
 167     stbl_payload += full_box(b'stco', 0, 0, stco_payload)  # Chunk Offset Box
 168
 169     minf_payload += box(b'stbl', stbl_payload)  # Sample Table Box
 170
 171     mdia_payload += box(b'minf', minf_payload)  # Media Information Box
 172
 173     trak_payload += box(b'mdia', mdia_payload)  # Media Box
 174
 175     moov_payload += box(b'trak', trak_payload)  # Track Box
 176
 177     mehd_payload = u64.pack(duration)
 178     mvex_payload = full_box(b'mehd', 1, 0, mehd_payload)  # Movie Extends Header Box
 179
 180     trex_payload = u32.pack(track_id)  # track id
 181     trex_payload += u32.pack(1)  # default sample description index
 182     trex_payload += u32.pack(0)  # default sample duration
 183     trex_payload += u32.pack(0)  # default sample size
 184     trex_payload += u32.pack(0)  # default sample flags
 185     mvex_payload += full_box(b'trex', 0, 0, trex_payload)  # Track Extends Box
 186
 187     moov_payload += box(b'mvex', mvex_payload)  # Movie Extends Box
 188     stream.write(box(b'moov', moov_payload))  # Movie Box
 189
 190
 191 def extract_box_data(data, box_sequence):
 192     data_reader = io.BytesIO(data)
 193     while True:
 194         box_size = u32.unpack(data_reader.read(4))[0]
 195         box_type = data_reader.read(4)
 196         if box_type == box_sequence[0]:
 197             box_data = data_reader.read(box_size - 8)
 198             if len(box_sequence) == 1:
 199                 return box_data
 200             return extract_box_data(box_data, box_sequence[1:])
 201         data_reader.seek(box_size - 8, 1)
 202
 203
 204 class IsmFD(FragmentFD):
 205     """
 206     Download segments in a ISM manifest
 207     """
 208
 209     FD_NAME = 'ism'
 210
 211     def real_download(self, filename, info_dict):
 212         segments = info_dict['fragments'][:1] if self.params.get(
 213             'test', False) else info_dict['fragments']
 214
 215         ctx = {
 216             'filename': filename,
 217             'total_frags': len(segments),
 218         }
 219
 220         self._prepare_and_start_frag_download(ctx)
 221
 222         fragment_retries = self.params.get('fragment_retries', 0)
 223         skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
 224
 225         track_written = False
 226         frag_index = 0
 227         for i, segment in enumerate(segments):
 228             frag_index += 1
 229             if frag_index <= ctx['fragment_index']:
 230                 continue
 231             count = 0
 232             while count <= fragment_retries:
 233                 try:
 234                     success, frag_content = self._download_fragment(ctx, segment['url'], info_dict)
 235                     if not success:
 236                         return False
 237                     if not track_written:
 238                         tfhd_data = extract_box_data(frag_content, [b'moof', b'traf', b'tfhd'])
 239                         info_dict['_download_params']['track_id'] = u32.unpack(tfhd_data[4:8])[0]
 240                         write_piff_header(ctx['dest_stream'], info_dict['_download_params'])
 241                         track_written = True
 242                     self._append_fragment(ctx, frag_content)
 243                     break
 244                 except compat_urllib_error.HTTPError as err:
 245                     count += 1
 246                     if count <= fragment_retries:
 247                         self.report_retry_fragment(err, frag_index, count, fragment_retries)
 248             if count > fragment_retries:
 249                 if skip_unavailable_fragments:
 250                     self.report_skip_fragment(frag_index)
 251                     continue
 252                 self.report_error('giving up after %s fragment retries' % fragment_retries)
 253                 return False
 254
 255         self._finish_frag_download(ctx)
 256
 257         return True