260 lines
10 KiB
Python
260 lines
10 KiB
Python
from __future__ import unicode_literals
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import time
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import binascii
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import io
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from .fragment import FragmentFD
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from ..compat import (
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compat_Struct,
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compat_urllib_error,
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)
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u8 = compat_Struct('>B')
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u88 = compat_Struct('>Bx')
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u16 = compat_Struct('>H')
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u1616 = compat_Struct('>Hxx')
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u32 = compat_Struct('>I')
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u64 = compat_Struct('>Q')
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s88 = compat_Struct('>bx')
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s16 = compat_Struct('>h')
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s1616 = compat_Struct('>hxx')
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s32 = compat_Struct('>i')
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unity_matrix = (s32.pack(0x10000) + s32.pack(0) * 3) * 2 + s32.pack(0x40000000)
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TRACK_ENABLED = 0x1
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TRACK_IN_MOVIE = 0x2
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TRACK_IN_PREVIEW = 0x4
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SELF_CONTAINED = 0x1
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def box(box_type, payload):
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return u32.pack(8 + len(payload)) + box_type + payload
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def full_box(box_type, version, flags, payload):
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return box(box_type, u8.pack(version) + u32.pack(flags)[1:] + payload)
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def write_piff_header(stream, params):
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track_id = params['track_id']
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fourcc = params['fourcc']
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duration = params['duration']
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timescale = params.get('timescale', 10000000)
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language = params.get('language', 'und')
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height = params.get('height', 0)
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width = params.get('width', 0)
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is_audio = width == 0 and height == 0
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creation_time = modification_time = int(time.time())
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ftyp_payload = b'isml' # major brand
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ftyp_payload += u32.pack(1) # minor version
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ftyp_payload += b'piff' + b'iso2' # compatible brands
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stream.write(box(b'ftyp', ftyp_payload)) # File Type Box
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mvhd_payload = u64.pack(creation_time)
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mvhd_payload += u64.pack(modification_time)
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mvhd_payload += u32.pack(timescale)
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mvhd_payload += u64.pack(duration)
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mvhd_payload += s1616.pack(1) # rate
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mvhd_payload += s88.pack(1) # volume
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mvhd_payload += u16.pack(0) # reserved
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mvhd_payload += u32.pack(0) * 2 # reserved
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mvhd_payload += unity_matrix
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mvhd_payload += u32.pack(0) * 6 # pre defined
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mvhd_payload += u32.pack(0xffffffff) # next track id
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moov_payload = full_box(b'mvhd', 1, 0, mvhd_payload) # Movie Header Box
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tkhd_payload = u64.pack(creation_time)
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tkhd_payload += u64.pack(modification_time)
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tkhd_payload += u32.pack(track_id) # track id
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tkhd_payload += u32.pack(0) # reserved
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tkhd_payload += u64.pack(duration)
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tkhd_payload += u32.pack(0) * 2 # reserved
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tkhd_payload += s16.pack(0) # layer
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tkhd_payload += s16.pack(0) # alternate group
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tkhd_payload += s88.pack(1 if is_audio else 0) # volume
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tkhd_payload += u16.pack(0) # reserved
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tkhd_payload += unity_matrix
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tkhd_payload += u1616.pack(width)
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tkhd_payload += u1616.pack(height)
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trak_payload = full_box(b'tkhd', 1, TRACK_ENABLED | TRACK_IN_MOVIE | TRACK_IN_PREVIEW, tkhd_payload) # Track Header Box
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mdhd_payload = u64.pack(creation_time)
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mdhd_payload += u64.pack(modification_time)
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mdhd_payload += u32.pack(timescale)
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mdhd_payload += u64.pack(duration)
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mdhd_payload += u16.pack(((ord(language[0]) - 0x60) << 10) | ((ord(language[1]) - 0x60) << 5) | (ord(language[2]) - 0x60))
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mdhd_payload += u16.pack(0) # pre defined
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mdia_payload = full_box(b'mdhd', 1, 0, mdhd_payload) # Media Header Box
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hdlr_payload = u32.pack(0) # pre defined
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hdlr_payload += b'soun' if is_audio else b'vide' # handler type
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hdlr_payload += u32.pack(0) * 3 # reserved
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hdlr_payload += (b'Sound' if is_audio else b'Video') + b'Handler\0' # name
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mdia_payload += full_box(b'hdlr', 0, 0, hdlr_payload) # Handler Reference Box
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if is_audio:
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smhd_payload = s88.pack(0) # balance
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smhd_payload += u16.pack(0) # reserved
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media_header_box = full_box(b'smhd', 0, 0, smhd_payload) # Sound Media Header
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else:
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vmhd_payload = u16.pack(0) # graphics mode
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vmhd_payload += u16.pack(0) * 3 # opcolor
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media_header_box = full_box(b'vmhd', 0, 1, vmhd_payload) # Video Media Header
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minf_payload = media_header_box
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dref_payload = u32.pack(1) # entry count
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dref_payload += full_box(b'url ', 0, SELF_CONTAINED, b'') # Data Entry URL Box
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dinf_payload = full_box(b'dref', 0, 0, dref_payload) # Data Reference Box
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minf_payload += box(b'dinf', dinf_payload) # Data Information Box
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stsd_payload = u32.pack(1) # entry count
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sample_entry_payload = u8.pack(0) * 6 # reserved
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sample_entry_payload += u16.pack(1) # data reference index
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if is_audio:
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sample_entry_payload += u32.pack(0) * 2 # reserved
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sample_entry_payload += u16.pack(params.get('channels', 2))
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sample_entry_payload += u16.pack(params.get('bits_per_sample', 16))
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sample_entry_payload += u16.pack(0) # pre defined
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sample_entry_payload += u16.pack(0) # reserved
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sample_entry_payload += u1616.pack(params['sampling_rate'])
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if fourcc == 'AACL':
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sample_entry_box = box(b'mp4a', sample_entry_payload)
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else:
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sample_entry_payload += u16.pack(0) # pre defined
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sample_entry_payload += u16.pack(0) # reserved
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sample_entry_payload += u32.pack(0) * 3 # pre defined
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sample_entry_payload += u16.pack(width)
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sample_entry_payload += u16.pack(height)
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sample_entry_payload += u1616.pack(0x48) # horiz resolution 72 dpi
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sample_entry_payload += u1616.pack(0x48) # vert resolution 72 dpi
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sample_entry_payload += u32.pack(0) # reserved
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sample_entry_payload += u16.pack(1) # frame count
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sample_entry_payload += u8.pack(0) * 32 # compressor name
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sample_entry_payload += u16.pack(0x18) # depth
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sample_entry_payload += s16.pack(-1) # pre defined
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codec_private_data = binascii.unhexlify(params['codec_private_data'].encode('utf-8'))
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if fourcc in ('H264', 'AVC1'):
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sps, pps = codec_private_data.split(u32.pack(1))[1:]
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avcc_payload = u8.pack(1) # configuration version
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avcc_payload += sps[1:4] # avc profile indication + profile compatibility + avc level indication
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avcc_payload += u8.pack(0xfc | (params.get('nal_unit_length_field', 4) - 1)) # complete representation (1) + reserved (11111) + length size minus one
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avcc_payload += u8.pack(1) # reserved (0) + number of sps (0000001)
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avcc_payload += u16.pack(len(sps))
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avcc_payload += sps
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avcc_payload += u8.pack(1) # number of pps
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avcc_payload += u16.pack(len(pps))
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avcc_payload += pps
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sample_entry_payload += box(b'avcC', avcc_payload) # AVC Decoder Configuration Record
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sample_entry_box = box(b'avc1', sample_entry_payload) # AVC Simple Entry
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stsd_payload += sample_entry_box
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stbl_payload = full_box(b'stsd', 0, 0, stsd_payload) # Sample Description Box
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stts_payload = u32.pack(0) # entry count
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stbl_payload += full_box(b'stts', 0, 0, stts_payload) # Decoding Time to Sample Box
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stsc_payload = u32.pack(0) # entry count
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stbl_payload += full_box(b'stsc', 0, 0, stsc_payload) # Sample To Chunk Box
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stco_payload = u32.pack(0) # entry count
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stbl_payload += full_box(b'stco', 0, 0, stco_payload) # Chunk Offset Box
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minf_payload += box(b'stbl', stbl_payload) # Sample Table Box
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mdia_payload += box(b'minf', minf_payload) # Media Information Box
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trak_payload += box(b'mdia', mdia_payload) # Media Box
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moov_payload += box(b'trak', trak_payload) # Track Box
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mehd_payload = u64.pack(duration)
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mvex_payload = full_box(b'mehd', 1, 0, mehd_payload) # Movie Extends Header Box
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trex_payload = u32.pack(track_id) # track id
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trex_payload += u32.pack(1) # default sample description index
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trex_payload += u32.pack(0) # default sample duration
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trex_payload += u32.pack(0) # default sample size
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trex_payload += u32.pack(0) # default sample flags
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mvex_payload += full_box(b'trex', 0, 0, trex_payload) # Track Extends Box
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moov_payload += box(b'mvex', mvex_payload) # Movie Extends Box
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stream.write(box(b'moov', moov_payload)) # Movie Box
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def extract_box_data(data, box_sequence):
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data_reader = io.BytesIO(data)
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while True:
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box_size = u32.unpack(data_reader.read(4))[0]
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box_type = data_reader.read(4)
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if box_type == box_sequence[0]:
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box_data = data_reader.read(box_size - 8)
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if len(box_sequence) == 1:
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return box_data
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return extract_box_data(box_data, box_sequence[1:])
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data_reader.seek(box_size - 8, 1)
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class IsmFD(FragmentFD):
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"""
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Download segments in a ISM manifest
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"""
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FD_NAME = 'ism'
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def real_download(self, filename, info_dict):
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segments = info_dict['fragments'][:1] if self.params.get(
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'test', False) else info_dict['fragments']
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ctx = {
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'filename': filename,
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'total_frags': len(segments),
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}
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self._prepare_and_start_frag_download(ctx)
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fragment_retries = self.params.get('fragment_retries', 0)
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skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
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track_written = False
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frag_index = 0
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for i, segment in enumerate(segments):
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frag_index += 1
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if frag_index <= ctx['fragment_index']:
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continue
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count = 0
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while count <= fragment_retries:
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try:
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success, frag_content = self._download_fragment(ctx, segment['url'], info_dict)
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if not success:
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return False
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if not track_written:
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tfhd_data = extract_box_data(frag_content, [b'moof', b'traf', b'tfhd'])
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info_dict['_download_params']['track_id'] = u32.unpack(tfhd_data[4:8])[0]
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write_piff_header(ctx['dest_stream'], info_dict['_download_params'])
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track_written = True
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self._append_fragment(ctx, frag_content)
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break
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except compat_urllib_error.HTTPError as err:
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count += 1
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if count <= fragment_retries:
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self.report_retry_fragment(err, frag_index, count, fragment_retries)
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if count > fragment_retries:
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if skip_unavailable_fragments:
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self.report_skip_fragment(frag_index)
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continue
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self.report_error('giving up after %s fragment retries' % fragment_retries)
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return False
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self._finish_frag_download(ctx)
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return True
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