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94 lines
3.8 KiB
Python
94 lines
3.8 KiB
Python
"""
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RealAudio (.ra) parser
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Author: Mike Melanson
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References:
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http://wiki.multimedia.cx/index.php?title=RealMedia
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Samples:
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http://samples.mplayerhq.hu/real/RA/
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"""
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from hachoir.parser import Parser
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from hachoir.field import (FieldSet,
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UInt8, UInt16, UInt32,
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Bytes, RawBytes, String,
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PascalString8)
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from hachoir.core.tools import humanFrequency
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from hachoir.core.text_handler import displayHandler
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from hachoir.core.endian import BIG_ENDIAN
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class Metadata(FieldSet):
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def createFields(self):
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yield PascalString8(self, "title", charset="ISO-8859-1")
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yield PascalString8(self, "author", charset="ISO-8859-1")
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yield PascalString8(self, "copyright", charset="ISO-8859-1")
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yield PascalString8(self, "comment", charset="ISO-8859-1")
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class RealAudioFile(Parser):
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MAGIC = b".ra\xFD"
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PARSER_TAGS = {
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"id": "real_audio",
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"category": "audio",
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"file_ext": ["ra"],
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"mime": ("audio/x-realaudio", "audio/x-pn-realaudio"),
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"min_size": 6 * 8,
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"magic": ((MAGIC, 0),),
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"description": "Real audio (.ra)",
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}
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endian = BIG_ENDIAN
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def validate(self):
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if self["signature"].value != self.MAGIC:
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return "Invalid signature"
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if self["version"].value not in (3, 4):
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return "Unknown version"
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return True
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def createFields(self):
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yield Bytes(self, "signature", 4, r"RealAudio identifier ('.ra\xFD')")
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yield UInt16(self, "version", "Version")
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if self["version"].value == 3:
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yield UInt16(self, "header_size", "Header size")
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yield RawBytes(self, "Unknown1", 10)
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yield UInt32(self, "data_size", "Data size")
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yield Metadata(self, "metadata")
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yield UInt8(self, "Unknown2")
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yield PascalString8(self, "FourCC")
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audio_size = self["data_size"].value
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else: # version = 4
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yield UInt16(self, "reserved1", "Reserved, should be 0")
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yield String(self, "ra4sig", 4, "'.ra4' signature")
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yield UInt32(self, "filesize", "File size (minus 40 bytes)")
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yield UInt16(self, "version2", "Version 2 (always equal to version)")
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yield UInt32(self, "headersize", "Header size (minus 16)")
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yield UInt16(self, "codec_flavor", "Codec flavor")
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yield UInt32(self, "coded_frame_size", "Coded frame size")
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yield RawBytes(self, "unknown1", 12)
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yield UInt16(self, "subpacketh", "Subpacket h (?)")
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yield UInt16(self, "frame_size", "Frame size")
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yield UInt16(self, "sub_packet_size", "Subpacket size")
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yield UInt16(self, "unknown2", "Unknown")
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yield displayHandler(UInt16(self, "sample_rate", "Sample rate"), humanFrequency)
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yield UInt16(self, "unknown3", "Unknown")
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yield UInt16(self, "sample_size", "Sample size")
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yield UInt16(self, "channels", "Channels")
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yield PascalString8(self, "Interleaving ID String")
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yield PascalString8(self, "FourCC")
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yield RawBytes(self, "unknown4", 3)
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yield Metadata(self, "metadata")
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audio_size = (self["filesize"].value + 40) - \
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(self["headersize"].value + 16)
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if 0 < audio_size:
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yield RawBytes(self, "audio_data", audio_size)
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def createDescription(self):
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if (self["version"].value == 3):
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return "RealAudio v3 file, '%s' codec" % self["FourCC"].value
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elif (self["version"].value == 4):
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return "RealAudio v4 file, '%s' codec, %s, %u channels" % (
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self["FourCC"].value, self["sample_rate"].display, self["channels"].value)
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else:
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return "Real audio"
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