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[downloader/f4m] Tolerate truncate segments when testing

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Replaces #9216

Fixes #9214 and test_Bloomberg partially
This commit is contained in:
Yen Chi Hsuan 2016-05-03 18:06:50 +08:00
parent 7e8ddca1bb
commit 1b405bb47d
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GPG key ID: 3FDDD575826C5C30
1 changed files with 32 additions and 10 deletions
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42
youtube_dl/downloader/f4m.py
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@ -23,26 +23,38 @@ from ..utils import (
) )
class DataTruncatedError(Exception):
pass
class FlvReader(io.BytesIO): class FlvReader(io.BytesIO):
""" """
Reader for Flv files Reader for Flv files
The file format is documented in https://www.adobe.com/devnet/f4v.html The file format is documented in https://www.adobe.com/devnet/f4v.html
""" """
def read_bytes(self, n):
data = self.read(n)
if len(data) < n:
raise DataTruncatedError(
'FlvReader error: need %d bytes while only %d bytes got' % (
n, len(data)))
return data
# Utility functions for reading numbers and strings # Utility functions for reading numbers and strings
def read_unsigned_long_long(self): def read_unsigned_long_long(self):
return compat_struct_unpack('!Q', self.read(8))[0] return compat_struct_unpack('!Q', self.read_bytes(8))[0]
def read_unsigned_int(self): def read_unsigned_int(self):
return compat_struct_unpack('!I', self.read(4))[0] return compat_struct_unpack('!I', self.read_bytes(4))[0]
def read_unsigned_char(self): def read_unsigned_char(self):
return compat_struct_unpack('!B', self.read(1))[0] return compat_struct_unpack('!B', self.read_bytes(1))[0]
def read_string(self): def read_string(self):
res = b'' res = b''
while True: while True:
char = self.read(1) char = self.read_bytes(1)
if char == b'\x00': if char == b'\x00':
break break
res += char res += char
@ -53,18 +65,18 @@ class FlvReader(io.BytesIO):
Read a box and return the info as a tuple: (box_size, box_type, box_data) Read a box and return the info as a tuple: (box_size, box_type, box_data)
""" """
real_size = size = self.read_unsigned_int() real_size = size = self.read_unsigned_int()
box_type = self.read(4) box_type = self.read_bytes(4)
header_end = 8 header_end = 8
if size == 1: if size == 1:
real_size = self.read_unsigned_long_long() real_size = self.read_unsigned_long_long()
header_end = 16 header_end = 16
return real_size, box_type, self.read(real_size - header_end) return real_size, box_type, self.read_bytes(real_size - header_end)
def read_asrt(self): def read_asrt(self):
# version # version
self.read_unsigned_char() self.read_unsigned_char()
# flags # flags
self.read(3) self.read_bytes(3)
quality_entry_count = self.read_unsigned_char() quality_entry_count = self.read_unsigned_char()
# QualityEntryCount # QualityEntryCount
for i in range(quality_entry_count): for i in range(quality_entry_count):
@ -85,7 +97,7 @@ class FlvReader(io.BytesIO):
# version # version
self.read_unsigned_char() self.read_unsigned_char()
# flags # flags
self.read(3) self.read_bytes(3)
# time scale # time scale
self.read_unsigned_int() self.read_unsigned_int()
@ -119,7 +131,7 @@ class FlvReader(io.BytesIO):
# version # version
self.read_unsigned_char() self.read_unsigned_char()
# flags # flags
self.read(3) self.read_bytes(3)
self.read_unsigned_int() # BootstrapinfoVersion self.read_unsigned_int() # BootstrapinfoVersion
# Profile,Live,Update,Reserved # Profile,Live,Update,Reserved
@ -374,7 +386,17 @@ class F4mFD(FragmentFD):
down.close() down.close()
reader = FlvReader(down_data) reader = FlvReader(down_data)
while True: while True:
_, box_type, box_data = reader.read_box_info() try:
_, box_type, box_data = reader.read_box_info()
except DataTruncatedError:
if test:
# In tests, segments may be truncated, and thus
# FlvReader may not be able to parse the whole
# chunk. If so, write the segment as is
# See https://github.com/rg3/youtube-dl/issues/9214
dest_stream.write(down_data)
break
raise
if box_type == b'mdat': if box_type == b'mdat':
dest_stream.write(box_data) dest_stream.write(box_data)
break break