def from_pcm(cls, filename, pcmreader,
compression="2"):
import decimal,bisect
if (compression not in cls.COMPRESSION_MODES):
compression = cls.DEFAULT_COMPRESSION
if ((pcmreader.channels > 2) or
(pcmreader.sample_rate not in (32000,48000,44100))):
pcmreader = PCMConverter(
pcmreader,
sample_rate=[32000,32000,44100,48000][bisect.bisect(
[32000,44100,48000],pcmreader.sample_rate)],
channels=min(pcmreader.channels,2),
channel_mask=ChannelMask.from_channels(min(pcmreader.channels,2)),
bits_per_sample=16)
if (pcmreader.channels > 1):
mode = "j"
else:
mode = "m"
#FIXME - not sure if all LAME versions support "--little-endian"
# #LAME 3.98 (and up, presumably) handle the byteswap correctly
# #LAME 3.97 always uses -x
# if (BIG_ENDIAN or (cls.__lame_version__() < (3,98))):
# endian = ['-x']
# else:
# endian = []
devnull = file(os.devnull,'ab')
sub = subprocess.Popen([BIN['lame'],"--quiet",
"-r",
"-s",str(decimal.Decimal(pcmreader.sample_rate) / 1000),
"--bitwidth",str(pcmreader.bits_per_sample),
"--signed","--little-endian",
"-m",mode,
"-V" + str(compression),
"-",
filename],
stdin=subprocess.PIPE,
stdout=devnull,
stderr=devnull,
preexec_fn=ignore_sigint)
transfer_framelist_data(pcmreader,sub.stdin.write)
try:
pcmreader.close()
except DecodingError:
raise EncodingError()
sub.stdin.close()
devnull.close()
if (sub.wait() == 0):
return MP3Audio(filename)
else:
raise EncodingError(BIN['lame'])
def from_pcm(cls, filename, pcmreader, compression=None):
import bisect
if (compression not in cls.COMPRESSION_MODES):
compression = cls.DEFAULT_COMPRESSION
if ((pcmreader.bits_per_sample not in (8,16)) or
(pcmreader.channels > 2) or
(pcmreader.sample_rate not in (8000,16000,32000,44100))):
pcmreader = PCMConverter(
pcmreader,
sample_rate=[8000,8000,16000,32000,44100][bisect.bisect(
[8000,16000,32000,44100],pcmreader.sample_rate)],
channels=min(pcmreader.channels,2),
channel_mask=ChannelMask.from_channels(min(pcmreader.channels,2)),
bits_per_sample=min(pcmreader.bits_per_sample,16))
BITS_PER_SAMPLE = {8:['--8bit'],
16:['--16bit']}[pcmreader.bits_per_sample]
CHANNELS = {1:[],2:['--stereo']}[pcmreader.channels]
devnull = file(os.devnull,"ab")
sub = subprocess.Popen([BIN['speexenc'],
'--quality',str(compression),
'--rate',str(pcmreader.sample_rate),
'--le'] + \
BITS_PER_SAMPLE + \
CHANNELS + \
['-',filename],
stdin=subprocess.PIPE,
stderr=devnull,
preexec_fn=ignore_sigint)
transfer_framelist_data(pcmreader,sub.stdin.write)
try:
pcmreader.close()
except DecodingError:
raise EncodingError()
sub.stdin.close()
result = sub.wait()
devnull.close()
if (result == 0):
return SpeexAudio(filename)
else:
raise EncodingError(BIN['speexenc'])
def from_pcm(cls, filename, pcmreader,
compression="192"):
import decimal,bisect
if (compression not in cls.COMPRESSION_MODES):
compression = cls.DEFAULT_COMPRESSION
if ((pcmreader.channels > 2) or
(pcmreader.sample_rate not in (32000,48000,44100)) or
(pcmreader.bits_per_sample != 16)):
pcmreader = PCMConverter(
pcmreader,
sample_rate=[32000,32000,44100,48000][bisect.bisect(
[32000,44100,48000],pcmreader.sample_rate)],
channels=min(pcmreader.channels,2),
channel_mask=pcmreader.channel_mask,
bits_per_sample=16)
devnull = file(os.devnull,'ab')
sub = subprocess.Popen([BIN['twolame'],"--quiet",
"-r",
"-s",str(pcmreader.sample_rate),
"--samplesize",str(pcmreader.bits_per_sample),
"-N",str(pcmreader.channels),
"-m","a",
"-b",compression,
"-",
filename],
stdin=subprocess.PIPE,
stdout=devnull,
stderr=devnull,
preexec_fn=ignore_sigint)
transfer_framelist_data(pcmreader,sub.stdin.write)
try:
pcmreader.close()
except DecodingError:
raise EncodingError()
sub.stdin.close()
devnull.close()
if (sub.wait() == 0):
return MP2Audio(filename)
else:
raise EncodingError(BIN['twolame'])