mirror of
https://github.com/moparisthebest/SickRage
synced 2024-11-06 01:15:05 -05:00
89 lines
3.2 KiB
Python
89 lines
3.2 KiB
Python
|
"""
|
||
|
|
AU audio file parser
|
||
|
|
|
||
|
|
Author: Victor Stinner
|
||
|
|
Creation: 12 july 2006
|
||
|
|
"""
|
||
|
|
|
||
|
|
from lib.hachoir_parser import Parser
|
||
|
|
from lib.hachoir_core.field import UInt32, Enum, String, RawBytes
|
||
|
|
from lib.hachoir_core.endian import BIG_ENDIAN
|
||
|
|
from lib.hachoir_core.text_handler import displayHandler, filesizeHandler
|
||
|
|
from lib.hachoir_core.tools import createDict, humanFrequency
|
||
|
|
|
||
|
|
class AuFile(Parser):
|
||
|
|
PARSER_TAGS = {
|
||
|
|
"id": "sun_next_snd",
|
||
|
|
"category": "audio",
|
||
|
|
"file_ext": ("au", "snd"),
|
||
|
|
"mime": (u"audio/basic",),
|
||
|
|
"min_size": 24*8,
|
||
|
|
"magic": ((".snd", 0),),
|
||
|
|
"description": "Sun/NeXT audio"
|
||
|
|
}
|
||
|
|
endian = BIG_ENDIAN
|
||
|
|
|
||
|
|
CODEC_INFO = {
|
||
|
|
1: (8, u"8-bit ISDN u-law"),
|
||
|
|
2: (8, u"8-bit linear PCM"),
|
||
|
|
3: (16, u"16-bit linear PCM"),
|
||
|
|
4: (24, u"24-bit linear PCM"),
|
||
|
|
5: (32, u"32-bit linear PCM"),
|
||
|
|
6: (32, u"32-bit IEEE floating point"),
|
||
|
|
7: (64, u"64-bit IEEE floating point"),
|
||
|
|
8: (None, u"Fragmented sample data"),
|
||
|
|
9: (None, u"DSP program"),
|
||
|
|
10: (8, u"8-bit fixed point"),
|
||
|
|
11: (16, u"16-bit fixed point"),
|
||
|
|
12: (24, u"24-bit fixed point"),
|
||
|
|
13: (32, u"32-bit fixed point"),
|
||
|
|
18: (16, u"16-bit linear with emphasis"),
|
||
|
|
19: (16, u"16-bit linear compressed"),
|
||
|
|
20: (16, u"16-bit linear with emphasis and compression"),
|
||
|
|
21: (None, u"Music kit DSP commands"),
|
||
|
|
23: (None, u"4-bit ISDN u-law compressed (CCITT G.721 ADPCM)"),
|
||
|
|
24: (None, u"ITU-T G.722 ADPCM"),
|
||
|
|
25: (None, u"ITU-T G.723 3-bit ADPCM"),
|
||
|
|
26: (None, u"ITU-T G.723 5-bit ADPCM"),
|
||
|
|
27: (8, u"8-bit ISDN A-law"),
|
||
|
|
}
|
||
|
|
|
||
|
|
# Create bit rate and codec name dictionnaries
|
||
|
|
BITS_PER_SAMPLE = createDict(CODEC_INFO, 0)
|
||
|
|
CODEC_NAME = createDict(CODEC_INFO, 1)
|
||
|
|
|
||
|
|
VALID_NB_CHANNEL = set((1,2)) # FIXME: 4, 5, 7, 8 channels are supported?
|
||
|
|
|
||
|
|
def validate(self):
|
||
|
|
if self.stream.readBytes(0, 4) != ".snd":
|
||
|
|
return "Wrong file signature"
|
||
|
|
if self["channels"].value not in self.VALID_NB_CHANNEL:
|
||
|
|
return "Invalid number of channel"
|
||
|
|
return True
|
||
|
|
|
||
|
|
def getBitsPerSample(self):
|
||
|
|
"""
|
||
|
|
Get bit rate (number of bit per sample per channel),
|
||
|
|
may returns None if you unable to compute it.
|
||
|
|
"""
|
||
|
|
return self.BITS_PER_SAMPLE.get(self["codec"].value)
|
||
|
|
|
||
|
|
def createFields(self):
|
||
|
|
yield String(self, "signature", 4, 'Format signature (".snd")', charset="ASCII")
|
||
|
|
yield UInt32(self, "data_ofs", "Data offset")
|
||
|
|
yield filesizeHandler(UInt32(self, "data_size", "Data size"))
|
||
|
|
yield Enum(UInt32(self, "codec", "Audio codec"), self.CODEC_NAME)
|
||
|
|
yield displayHandler(UInt32(self, "sample_rate", "Number of samples/second"), humanFrequency)
|
||
|
|
yield UInt32(self, "channels", "Number of interleaved channels")
|
||
|
|
|
||
|
|
size = self["data_ofs"].value - self.current_size // 8
|
||
|
|
if 0 < size:
|
||
|
|
yield String(self, "info", size, "Information", strip=" \0", charset="ISO-8859-1")
|
||
|
|
|
||
|
|
size = min(self["data_size"].value, (self.size - self.current_size) // 8)
|
||
|
|
yield RawBytes(self, "audio_data", size, "Audio data")
|
||
|
|
|
||
|
|
def createContentSize(self):
|
||
|
|
return (self["data_ofs"].value + self["data_size"].value) * 8
|
||
|
|
|