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How to use read_chunk_header method in yandex-tank
Best Python code snippet using yandex-tank
gmo.py
Source:gmo.py 
1import struct2import io3def read_chunk_header(data):4 return struct.unpack_from('<HHI', data)5class Gmo:6 def __init__(self, data):7 # check magic numbers8 assert data[0:16] == b'OMG.00.1PSP\00\00\00\00\00'9 # skip over top level entry (0x0002)10 data = data[16:]11 chunk_type, header_size, chunk_size = read_chunk_header(data)12 assert chunk_type == 0x000213 data = data[header_size:]14 self.subfiles = []15 # read subfiles16 while len(data) > 0:17 if len(data) < 8:18 print('# WARN: not enough data to read last chunk')19 break20 chunk_type, header_size, chunk_size = read_chunk_header(data)21 if chunk_type == 0:22 print('# WARN: chunk type 0 encountered')23 break24 assert chunk_type == 325 self.subfiles.append(GmoSubfile(data[8:header_size], data[header_size:chunk_size]))26 data = data[chunk_size:]27class GmoSubfile:28 def __init__(self, header, data):29 self.bones = []30 self.objects = []31 self.materials = []32 self.textures = []33 # read chunks34 while len(data) > 0:35 chunk_type, header_size, chunk_size = read_chunk_header(data)36 if chunk_type == 4: # bone37 self.bones.append(GmoBone(data[8:header_size], data[header_size:chunk_size]))38 elif chunk_type == 5: # object39 self.objects.append(GmoObject(data[8:header_size], data[header_size:chunk_size]))40 elif chunk_type == 8: # material41 self.materials.append(GmoMaterial(data[8:header_size], data[header_size: chunk_size]))42 elif chunk_type == 0xa: # texture43 self.read_texture(data[8:header_size], data[header_size:chunk_size])44 else:45 print('# TODO: subfile chunk type {:04x} [{}]'.format(chunk_type, data[:chunk_size].hex()))46 data = data[chunk_size:]47 def read_texture(self, header, data):48 while len(data) > 0:49 chunk_type, header_size, chunk_size = read_chunk_header(data)50 assert chunk_type == 0x8012 and header_size == 051 if chunk_type == 0x8012: # texture... path?? in development???52 # oh my god its even a png53 # maybe theres a toggle to use this instead of the usual tga?54 path = data[8:chunk_size].decode().rstrip('\00')55 self.textures.append(path)56 else:57 print('# TODO: texture chunk type {:04x} [{}]'.format(chunk_type, data[:chunk_size].hex()))58 data = data[chunk_size:]59 def write_mtl(self, mtl):60 for i, material in enumerate(self.materials):61 print('newmtl {:02}'.format(i), file=mtl)62 material._write_mtl(self, mtl)63 print(file=mtl)64class GmoBone:65 def __init__(self, header, data):66 while len(data) > 0:67 chunk_type, header_size, chunk_size = read_chunk_header(data)68 print('# TODO: bone chunk type {:04x}'.format(chunk_type))69 data = data[chunk_size:]70class GmoVertex:71 def __init__(self, uv, norm, pos):72 self.uv = uv73 self.norm = norm74 self.pos = pos75class GmoMesh:76 def __init__(self, material_index, faces):77 self.material_index = material_index78 self.faces = faces79class GmoObject:80 def __init__(self, header, data):81 self.meshes = []82 self.vertices = []83 while len(data) > 0:84 chunk_type, header_size, chunk_size = read_chunk_header(data)85 if chunk_type == 6: # mesh86 self.meshes.append(GmoMesh(data[8:header_size], data[header_size:chunk_size]))87 elif chunk_type == 7: # vertex array88 #print(data[header_size:chunk_size].hex())89 # TODO: what the fuck do these values mean90 val0, vertex_count = struct.unpack_from('<II', data[header_size:])91 if val0 == 0x240011ff:92 vertex_size = 9*493 elif val0 == 0x200011e3:94 vertex_size = 8*495 else:96 print('# TODO: vertex array format {:08x}'.format(val0))97 vertex_data_offset = chunk_size - vertex_count*vertex_size98 for i in range(vertex_count):99 if val0 == 0x240011ff:100 # unknown third value101 u, v, _, nx, ny, nz, x, y, z = struct.unpack_from('<fff fff fff', data[vertex_data_offset + i*vertex_size:])102 elif val0 == 0x200011e3:103 u, v, nx, ny, nz, x, y, z = struct.unpack_from('<ff fff fff', data[vertex_data_offset + i*vertex_size:])104 self.vertices.append(GmoVertex((u, v), (nx, ny, nz), (x, y, z)))105 else:106 print('# TODO: model surface chunk type {:04x} [{}]'.format(chunk_type, data[:chunk_size].hex()))107 data = data[chunk_size:]108 def write_obj(self, obj, mtl_path):109 print('mtllib {}'.format(mtl_path), file=obj)110 print(file=obj)111 for vertex in self.vertices:112 print('v {} {} {}'.format(*vertex.pos), file=obj)113 print('vt {} {}'.format(vertex.uv[0], 1.0 - vertex.uv[1]), file=obj)114 print('vn {} {} {}'.format(*vertex.norm), file = obj)115 print(file=obj)116 for i, mesh in enumerate(self.meshes):117 print('g {:02}'.format(i), file=obj)118 print('usemtl {:02}'.format(mesh.material_index), file=obj)119 for face in mesh.faces:120 assert len(face) in [3, 4]121 if len(face) == 3:122 print('f {a}/{a}/{a} {b}/{b}/{b} {c}/{c}/{c}'.format(a=face[0]+1, b=face[1]+1, c=face[2]+1), file=obj)123 elif len(face) == 4:124 print('f {a}/{a}/{a} {b}/{b}/{b} {c}/{c}/{c} {d}/{d}/{d}'.format(a=face[0]+1, b=face[1]+1, c=face[2]+1, d=face[3]+1), file=obj)125class GmoMesh:126 def __init__(self, header, data):127 self.faces = []128 while len(data) > 0:129 chunk_type, header_size, chunk_size = read_chunk_header(data)130 131 if chunk_type == 0x8061: # material info132 self.material_index = struct.unpack_from('< H', data[8:])[0] - 0x2000133 elif chunk_type == 0x8066: # index data134 assert header_size == 0135 header_size = 8136 val0, val1, primitive_type = struct.unpack_from('< HHI', data[header_size:])137 val0 = val0 - 0x1000 # an index... into what? vertex array probably138 #assert val0 == 0139 assert val1 == 7 #no idea about this one140 stripe_size, stripe_count = struct.unpack_from('< II', data[header_size+8:])141 if primitive_type == 3: # triangles142 assert stripe_count == 1143 #print(stripe_size, (chunk_size - (header_size+16))/2)144 for i in range(stripe_size//3):145 a, b, c = struct.unpack_from('< HHH', data[header_size+16 + i*6:])146 self.faces.append((a, b, c))147 return148 elif primitive_type == 4: # quads149 print(stripe_size, stripe_count)150 for i in range(stripe_count):151 for j in range(stripe_size//2 - 1):152 a, b, d, c = struct.unpack_from('< HHHH', data[header_size+16 + i*stripe_size*2 + j*4:])153 self.faces.append((a, b, c, d))154 else:155 print('# WARN: unknown primitive type {}'.format(primitive_type))156 else:157 print('# TODO: mesh chunk type {:04x} [{}]'.format(chunk_type, data[:chunk_size].hex()))158 data = data[chunk_size:]159class GmoMaterial:160 def __init__(self, header, data):161 while len(data) > 0:162 chunk_type, header_size, chunk_size = read_chunk_header(data)163 if chunk_type == 9: # texture reference164 print('- texture ref -')165 print(header_size, chunk_size)166 print(data[8:header_size].hex())167 print(data[header_size:].hex())168 self.texture_index = struct.unpack_from('<H', data[header_size+8:])[0] - 0x2000169 elif chunk_type == 0x8082: # rgba color170 r, g, b, a = struct.unpack('< ffff', data[8:chunk_size])171 self.color = (r, g, b, a)172 else:173 print('# TODO: material chunk type {:04x} [{}]'.format(chunk_type, data[:chunk_size].hex()))174 data = data[chunk_size:]175 def _write_mtl(self, subfile, mtl):176 if hasattr(self, 'texture_index'):...
wave.py
Source:wave.py
...68 sp_wavfile.write(filepath, self._sample_rate, data_int)69 @staticmethod70 def from_file(filepath):71 logging.info('Loading wav ' + filepath)72 def read_chunk_header(file):73 chunk_id = file.read(4)74 chunk_size, = struct.unpack('<I', file.read(4))75 return chunk_id, chunk_size76 with open(filepath, 'rb') as file:77 riff_id, riff_size = read_chunk_header(file)78 if riff_id != b'RIFF':79 raise ValueError('RIFF header id incorrect', riff_id)80 # check if you want, but pretty much ignore81 wave_id = file.read(4)82 fmt_id, fmt_size = read_chunk_header(file)83 if fmt_id != b'fmt ':84 raise ValueError('FMT header id incorrect', riff_id)85 fmt_chunk = file.read(16)86 audio_fmt, num_chan, sr, bytes_per_sec, block_align, bit_depth = struct.unpack('<HHIIHH', fmt_chunk)87 # skip over the extended format stuff for now88 fmt_ext = file.read(fmt_size - 16)89 next_chunk_id, next_chunk_size = read_chunk_header(file)90 while next_chunk_id != b'data':91 file.seek(next_chunk_size, 1)92 next_chunk_id, next_chunk_size = read_chunk_header(file)93 data_start = file.tell()94 data_len = next_chunk_size95 byte_depth = bit_depth / 896 num_frames = int(data_len / byte_depth / num_chan)97 file = tf.read_file(filepath)98 audio_data = tf.decode_raw(tf.substr(file, data_start, data_len), BIT_DEPTH_TYPE[bit_depth], little_endian=True)99 audio_data = tf.cast(audio_data, tf.float32) / (2 ** (bit_depth - 1))100 audio_data = tf.reshape(audio_data, [num_frames, num_chan])...
playaiff.py
Source:playaiff.py
...10 sampwidth = c.getwidth()11 samprate = 0.0 # unknown12 filename = sys.argv[1]13 f = open(filename, 'r')14 type, totalsize = aiff.read_chunk_header(f)15 if type <> 'FORM':16 raise aiff.Error, 'FORM chunk expected at start of file'17 aiff.read_form_chunk(f)18 while 1:19 try:20 type, size = aiff.read_chunk_header(f)21 except EOFError:22 break23 if v: print 'header:', `type`, size24 if type == 'COMM':25 nchannels, nsampframes, sampwidth, samprate = \26 aiff.read_comm_chunk(f)27 if v: print nchannels, nsampframes, sampwidth, samprate28 elif type == 'SSND':29 offset, blocksize = aiff.read_ssnd_chunk(f)30 if v: print offset, blocksize31 data = f.read(size-8)32 if size%2: void = f.read(1)33 p = makeport(nchannels, sampwidth, samprate)34 play(p, data, offset, blocksize)...
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