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 = sample_entry_payload
 130         sample_entry_payload += u16.pack(0)  # pre defined
 131         sample_entry_payload += u16.pack(0)  # reserved
 132         sample_entry_payload += u32.pack(0) * 3  # pre defined
 133         sample_entry_payload += u16.pack(width)
 134         sample_entry_payload += u16.pack(height)
 135         sample_entry_payload += u1616.pack(0x48)  # horiz resolution 72 dpi
 136         sample_entry_payload += u1616.pack(0x48)  # vert resolution 72 dpi
 137         sample_entry_payload += u32.pack(0)  # reserved
 138         sample_entry_payload += u16.pack(1)  # frame count
 139         sample_entry_payload += u8.pack(0) * 32  # compressor name
 140         sample_entry_payload += u16.pack(0x18)  # depth
 141         sample_entry_payload += s16.pack(-1)  # pre defined
 142
 143         codec_private_data = binascii.unhexlify(params['codec_private_data'])
 144         if fourcc in ('H264', 'AVC1'):
 145             sps, pps = codec_private_data.split(u32.pack(1))[1:]
 146             avcc_payload = u8.pack(1)  # configuration version
 147             avcc_payload += sps[1:4]  # avc profile indication + profile compatibility + avc level indication
 148             avcc_payload += u8.pack(0xfc | (params.get('nal_unit_length_field', 4) - 1))  # complete represenation (1) + reserved (11111) + length size minus one
 149             avcc_payload += u8.pack(1)  # reserved (0) + number of sps (0000001)
 150             avcc_payload += u16.pack(len(sps))
 151             avcc_payload += sps
 152             avcc_payload += u8.pack(1)  # number of pps
 153             avcc_payload += u16.pack(len(pps))
 154             avcc_payload += pps
 155             sample_entry_payload += box(b'avcC', avcc_payload)  # AVC Decoder Configuration Record
 156             sample_entry_box = box(b'avc1', sample_entry_payload)  # AVC Simple Entry
 157     stsd_payload += sample_entry_box
 158
 159     stbl_payload = full_box(b'stsd', 0, 0, stsd_payload)  # Sample Description Box
 160
 161     stts_payload = u32.pack(0)  # entry count
 162     stbl_payload += full_box(b'stts', 0, 0, stts_payload)  # Decoding Time to Sample Box
 163
 164     stsc_payload = u32.pack(0)  # entry count
 165     stbl_payload += full_box(b'stsc', 0, 0, stsc_payload)  # Sample To Chunk Box
 166
 167     stco_payload = u32.pack(0)  # entry count
 168     stbl_payload += full_box(b'stco', 0, 0, stco_payload)  # Chunk Offset Box
 169
 170     minf_payload += box(b'stbl', stbl_payload)  # Sample Table Box
 171
 172     mdia_payload += box(b'minf', minf_payload)  # Media Information Box
 173
 174     trak_payload += box(b'mdia', mdia_payload)  # Media Box
 175
 176     moov_payload += box(b'trak', trak_payload)  # Track Box
 177
 178     mehd_payload = u64.pack(duration)
 179     mvex_payload = full_box(b'mehd', 1, 0, mehd_payload)  # Movie Extends Header Box
 180
 181     trex_payload = u32.pack(track_id)  # track id
 182     trex_payload += u32.pack(1)  # default sample description index
 183     trex_payload += u32.pack(0)  # default sample duration
 184     trex_payload += u32.pack(0)  # default sample size
 185     trex_payload += u32.pack(0)  # default sample flags
 186     mvex_payload += full_box(b'trex', 0, 0, trex_payload)  # Track Extends Box
 187
 188     moov_payload += box(b'mvex', mvex_payload)  # Movie Extends Box
 189     stream.write(box(b'moov', moov_payload))  # Movie Box
 190
 191
 192 def extract_box_data(data, box_sequence):
 193     data_reader = io.BytesIO(data)
 194     while True:
 195         box_size = u32.unpack(data_reader.read(4))[0]
 196         box_type = data_reader.read(4)
 197         if box_type == box_sequence[0]:
 198             box_data = data_reader.read(box_size - 8)
 199             if len(box_sequence) == 1:
 200                 return box_data
 201             return extract_box_data(box_data, box_sequence[1:])
 202         data_reader.seek(box_size - 8, 1)
 203
 204
 205 class IsmFD(FragmentFD):
 206     """
 207     Download segments in a ISM manifest
 208     """
 209
 210     FD_NAME = 'ism'
 211
 212     def real_download(self, filename, info_dict):
 213         segments = info_dict['fragments'][:1] if self.params.get(
 214             'test', False) else info_dict['fragments']
 215
 216         ctx = {
 217             'filename': filename,
 218             'total_frags': len(segments),
 219         }
 220
 221         self._prepare_and_start_frag_download(ctx)
 222
 223         fragment_retries = self.params.get('fragment_retries', 0)
 224         skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
 225
 226         track_written = False
 227         frag_index = 0
 228         for i, segment in enumerate(segments):
 229             frag_index += 1
 230             if frag_index <= ctx['fragment_index']:
 231                 continue
 232             count = 0
 233             while count <= fragment_retries:
 234                 try:
 235                     success, frag_content = self._download_fragment(ctx, segment['url'], info_dict)
 236                     if not success:
 237                         return False
 238                     if not track_written:
 239                         tfhd_data = extract_box_data(frag_content, [b'moof', b'traf', b'tfhd'])
 240                         info_dict['_download_params']['track_id'] = u32.unpack(tfhd_data[4:8])[0]
 241                         write_piff_header(ctx['dest_stream'], info_dict['_download_params'])
 242                         track_written = True
 243                     self._append_fragment(ctx, frag_content)
 244                     break
 245                 except compat_urllib_error.HTTPError as err:
 246                     count += 1
 247                     if count <= fragment_retries:
 248                         self.report_retry_fragment(err, frag_index, count, fragment_retries)
 249             if count > fragment_retries:
 250                 if skip_unavailable_fragments:
 251                     self.report_skip_fragment(frag_index)
 252                     continue
 253                 self.report_error('giving up after %s fragment retries' % fragment_retries)
 254                 return False
 255
 256         self._finish_frag_download(ctx)
 257
 258         return True