/usr/share/pyshared/Photon/AVI.py is in photon 0.4.6-3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Parse a AVI movie file produced by many digital camera
#
#
import struct, array
from random import randrange
avi_verbose = 0
huffman_table = array.array('c',
"\xFF\xC4\x01\xA2\x00\x00\x01\x05\x01\x01\x01\x01"\
"\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x01\x02"\
"\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x01\x00\x03"\
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x00\x00\x00"\
"\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09"\
"\x0A\x0B\x10\x00\x02\x01\x03\x03\x02\x04\x03\x05"\
"\x05\x04\x04\x00\x00\x01\x7D\x01\x02\x03\x00\x04"\
"\x11\x05\x12\x21\x31\x41\x06\x13\x51\x61\x07\x22"\
"\x71\x14\x32\x81\x91\xA1\x08\x23\x42\xB1\xC1\x15"\
"\x52\xD1\xF0\x24\x33\x62\x72\x82\x09\x0A\x16\x17"\
"\x18\x19\x1A\x25\x26\x27\x28\x29\x2A\x34\x35\x36"\
"\x37\x38\x39\x3A\x43\x44\x45\x46\x47\x48\x49\x4A"\
"\x53\x54\x55\x56\x57\x58\x59\x5A\x63\x64\x65\x66"\
"\x67\x68\x69\x6A\x73\x74\x75\x76\x77\x78\x79\x7A"\
"\x83\x84\x85\x86\x87\x88\x89\x8A\x92\x93\x94\x95"\
"\x96\x97\x98\x99\x9A\xA2\xA3\xA4\xA5\xA6\xA7\xA8"\
"\xA9\xAA\xB2\xB3\xB4\xB5\xB6\xB7\xB8\xB9\xBA\xC2"\
"\xC3\xC4\xC5\xC6\xC7\xC8\xC9\xCA\xD2\xD3\xD4\xD5"\
"\xD6\xD7\xD8\xD9\xDA\xE1\xE2\xE3\xE4\xE5\xE6\xE7"\
"\xE8\xE9\xEA\xF1\xF2\xF3\xF4\xF5\xF6\xF7\xF8\xF9"\
"\xFA\x11\x00\x02\x01\x02\x04\x04\x03\x04\x07\x05"\
"\x04\x04\x00\x01\x02\x77\x00\x01\x02\x03\x11\x04"\
"\x05\x21\x31\x06\x12\x41\x51\x07\x61\x71\x13\x22"\
"\x32\x81\x08\x14\x42\x91\xA1\xB1\xC1\x09\x23\x33"\
"\x52\xF0\x15\x62\x72\xD1\x0A\x16\x24\x34\xE1\x25"\
"\xF1\x17\x18\x19\x1A\x26\x27\x28\x29\x2A\x35\x36"\
"\x37\x38\x39\x3A\x43\x44\x45\x46\x47\x48\x49\x4A"\
"\x53\x54\x55\x56\x57\x58\x59\x5A\x63\x64\x65\x66"\
"\x67\x68\x69\x6A\x73\x74\x75\x76\x77\x78\x79\x7A"\
"\x82\x83\x84\x85\x86\x87\x88\x89\x8A\x92\x93\x94"\
"\x95\x96\x97\x98\x99\x9A\xA2\xA3\xA4\xA5\xA6\xA7"\
"\xA8\xA9\xAA\xB2\xB3\xB4\xB5\xB6\xB7\xB8\xB9\xBA"\
"\xC2\xC3\xC4\xC5\xC6\xC7\xC8\xC9\xCA\xD2\xD3\xD4"\
"\xD5\xD6\xD7\xD8\xD9\xDA\xE2\xE3\xE4\xE5\xE6\xE7"\
"\xE8\xE9\xEA\xF2\xF3\xF4\xF5\xF6\xF7\xF8\xF9\xFA" )
def read_headers(filename,size=65536):
h = None
f = open(filename,'rb')
if f:
h = f.read(size)
return (f, h)
def read_le32(f):
h = f.read(4)
s = struct.unpack("<L", h)
return s[0]
def build_cache(f, info):
f.seek(info['movie_start'], 0)
info['frames_offsets'] = []
n_frame_data = 0
while n_frame_data<info['frames']:
tag = f.read(4)
if len(tag)<4:
return None
tag_size = read_le32(f)
if tag == '00dc': # If more than one stream, i'll be in trouble
info['frames_offsets'].append((f.tell(), tag_size))
n_frame_data+=1
elif tag == '01wb':
# audio
pass
elif tag == 'idx1':
# This is an optional index, for the moment, it is not used
break
else:
print "Unknown chunk ID ", tag
f.seek(tag_size, 1)
if avi_verbose>1:
print "Total number of frames: %d" % (info['frames'])
print "Total read: %d" % n_frame_data
#
# Some AVI have an index to frame, at the end of the file. This can speed up a
# lot, when doing fast forward/backward. But sometimes, the pos is not from the
# beginning of the file, but from the start of the movie
#
def read_idx(f, info, size):
info['frames_offsets'] = []
n = size/16
if n<1:
return None
while n:
tag = f.read(4)
flags = read_le32(f)
pos = read_le32(f)
len = read_le32(f)
if tag == '00dc':
info['frames_offsets'].append(pos, len)
#print "Tag: %s; flags=%8.8x; pos=%8d; len=%8d" % (tag, flags, pos, len)
n-=1
return 1
#
# Is this file have an index ?, so loaded
#
def find_n_read_idx(f, info):
f.seek(12, 0)
while True:
tag = f.read(4)
if len(tag)<4:
return None
tag_size = read_le32(f)
#print "Tag: %s (len=%8d)" % (tag, tag_size)
if tag == 'idx1':
return read_idx(f, info, tag_size)
else:
if tag_size&1:
tag_size+=1
f.seek(tag_size, 1)
return None
#
# Copy the Jpeg data from the stream to out
# In MJPEG, many stream don't include the huffman table.
# We need to parse the JPEG stream header to find if we need to add a default huffman table.
#
def fix_n_output_jpeg(h, out):
has_huffmantable = 0
i = 2
while True:
# Hum, this is not a valid chunk
if h[i] != "\xff":
return None
i+=1
# Skip any padding ff byte (this normal)
while h[i] == 0xff:
i+=1
# All SOF0 to SOF15 is valid (for me) not sure
#print "Found marker %2.2x at index %d"% (ord(h[i]),i)
if h[i] =='\xc4':
has_huffmantable = 1
if h[i] == '\xda':
# Need to flush all the file
if has_huffmantable:
out.write(h)
else:
out.write(h[0:i-1])
out.write(huffman_table)
out.write(h[i-1:])
return
i+=1
# Skip to next marker
s = struct.unpack(">H", h[i:i+2])
i += s[0]
#
# Extract one image from the file
#
def extract_jpeg_file(moviefile, info, outfile, frame):
f = open(moviefile, 'rb')
# Build a cache
if not info.has_key('frames_offsets'):
build_cache(f, info)
# Seek and copy the frame data into the file
try:
(offset, size) = info['frames_offsets'][frame]
except IndexError:
print "Warning: trying to grab frame %d but this frame is not found in the movie" % frame
print "Perhaps, the file is too short"
(offset, size) = info['frames_offsets'][len(info['frames_offsets'])-1]
f.seek(offset,0)
out = open(outfile, "wb")
h = f.read(size)
f.close()
if h[0:2] == '\xff\xd8': # To be sure that we extract a Jpeg file
fix_n_output_jpeg(h, out)
else:
print "Warning: this is not a jpeg file (frame=%d)" % frame
out.close()
def __identify(filename):
if struct.calcsize(">L") != 4:
print "A long is not equal to 4 bytes with your python installation. Abording"
return None
f, h = read_headers(filename,12)
if h == None:
return None
if h[0:4] != 'RIFF': # RIFF header
return None
# 4-8 Filesize
if h[8:12] != 'AVI ': # Avi chunk
return None
info = {}
stream_index = -1 # Current Stream Header currently parsing [0...n_streams]
us_frame = 0
current_codec_type = None
video_codec = None
info['video_size'] = (0,0)
info['frames'] = 0
info['format'] = None
while True:
tag = f.read(4)
if len(tag)<4:
return None
tag_size = read_le32(f)
if avi_verbose>0:
print "Tag \"%s\" length=%d" % (tag, tag_size)
if tag == 'LIST':
if avi_verbose>0:
print "Type LIST"
stag = f.read(4)
if stag == 'movi':
info['movie_end'] = f.tell() + tag_size - 4
info['movie_start'] = f.tell()
if avi_verbose>0:
print " movie_end at %d" % info['movie_end']
break
else:
if avi_verbose>0:
print " ignoring unknown subtag ", stag
#f.seek(tag_size-4, 1)
elif tag == 'avih':
if avi_verbose>0:
print "Type AVI header"
us_frame = read_le32(f) # in microsecond
bit_rate = read_le32(f) * 8
pad_gran = read_le32(f)
flags = read_le32(f)
info['frames'] = read_le32(f)
init_frames = read_le32(f)
n_streams = read_le32(f)
f.seek(tag_size-7*4, 1)
if avi_verbose>0:
print " us_frame = %d" % us_frame
print " bit_rate = %d" % bit_rate
print " flags = %x" % flags
print " total frames = %d" % info['frames']
print " init_frames = %d" % init_frames
print " n_streams = %d" % n_streams
elif tag == 'strh':
if avi_verbose>0:
print "Type Stream Header"
stream_index+=1
stag = f.read(4)
if stag == "vids":
if avi_verbose>0:
print " subtag 'vids'"
current_codec_type = "VIDEO"
codec_tag = f.read(4)
flags = read_le32(f)
priority_n_language = read_le32(f)
inital_frame = read_le32(f)
scale= read_le32(f)
rate= read_le32(f)
if scale and rate:
frame_rate = rate
frame_rate_base = scale
elif us_frame:
frame_rate = 1000000
frame_rate_base = us_frame
else:
frame_rate = 25
frame_rate_base = 1
f.seek(tag_size-7*4, 1)
if avi_verbose>0:
print " codec_tag = ", codec_tag
print " flags = %x" % flags
print " scale = %d" % scale
print " rate = %d" % rate
print " frame_rate = %d / frame_rate_base = %d" % (frame_rate, frame_rate_base)
# Only mjpeg is supported
if codec_tag != 'mjpg':
return None
elif stag == "auds":
if avi_verbose>0:
print " subtag 'auds'"
current_codec_type = "AUDIO"
f.seek(tag_size-4, 1)
else:
if avi_verbose>0:
print "Unknown subtag %s for type 'strh'" % stag
return None
elif tag == 'strf':
if current_codec_type == "VIDEO":
stream_length = read_le32(f)
stream_width = read_le32(f)
stream_height = read_le32(f)
f.seek(4, 1)
video_codec = f.read(4)
#f.seek(5*4, 1)
#video_extra_huffmantable = f.read(tag_size - 10*4)
f.seek(tag_size-5*4, 1)
info['video_size'] = (stream_width, stream_height)
if avi_verbose>0:
print " stream_length = %d" % stream_length
print " stream size = %dx%d" % info['video_size']
print " Video Codec = %s" % video_codec
elif current_codec_type == "AUDIO":
f.seek(tag_size, 1)
else:
if avi_verbose>0:
print "Unknown codec_type for Stream Format"
return None
else:
if avi_verbose>0:
print "Unknow header ", tag
if tag_size&1:
tag_size+=1
f.seek(tag_size,1)
f.close()
if video_codec == "MJPG":
info['format'] = "MJPG"
return info
print "video_codec: ", video_codec
return None
def identify(filename):
return __identify(filename)
def extract_random_picture(moviefile, pictfile):
video = __identify(moviefile)
if video == None:
return None
r = randrange(0, video['frames'])
extract_jpeg_file(moviefile, video, pictfile, r)
return True
def extract_picture(moviefile, pictfile, frame):
video = __identify(moviefile)
if video == None:
return None
extract_jpeg_file(moviefile, video, pictfile, frame)
return True
if __name__ == "__main__":
import sys
import AVI
if len(sys.argv) < 2:
print 'Usage: %s files...\n' % sys.argv[0]
sys.exit(0)
for filename in sys.argv[1:]:
info=AVI.identify(filename)
if info != None:
print "%s (format='%s', frames='%d')" % (filename,info['format'],info['frames'])
for frame in xrange(info['frames']):
extract_jpeg_file(filename, info, "/tmp/photon%8.8d.jpg" % frame, frame)
else:
print "%s is not a AVI movie file" % filename
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