+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2013 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+##
+
+import sigrokdecode as srd
+import os
+import sys
+
+class Decoder(srd.Decoder):
+ api_version = 1
+ id = 'i2s_dump'
+ name = 'I2S dump'
+ longname = 'I2S dump'
+ desc = 'Output decoded I2S data to a file.'
+ license = 'gplv2+'
+ inputs = ['i2s']
+ outputs = []
+ probes = []
+ optional_probes = []
+ options = {
+ 'format': ['File format for the output data', 'wav'],
+ 'filename': ['File name for the output data', '-'],
+ }
+ annotations = []
+
+ def __init__(self, **kwargs):
+ self.wrote_header = False
+ self.f = None
+
+ def file_open(self, filename):
+ if filename == 'none':
+ return None
+ elif filename == '-':
+ return sys.stdout
+ else:
+ return open(filename, 'wb')
+
+ def start(self, metadata):
+ # A filename of 'none' is not allowed (has special meaning). A filename
+ # of '-' means 'stdout'.
+ self.f = self.file_open(self.options['filename'])
+
+ def report(self):
+ pass
+
+ # TODO: Lots of hard-coded fields in here.
+ def write_wav_header(self):
+ # Chunk descriptor
+ self.f.write(b'RIFF')
+ self.f.write(b'\x24\x80\x00\x00') # Chunk size (2084)
+ self.f.write(b'WAVE')
+
+ # Fmt subchunk
+ self.f.write(b'fmt ')
+ self.f.write(b'\x10\x00\x00\x00') # Subchunk size (16 bytes)
+ self.f.write(b'\x01\x00') # Audio format (0x0001 == PCM)
+ self.f.write(b'\x02\x00') # Number of channels (2)
+ self.f.write(b'\x44\xac\x00\x00') # Samplerate (44100)
+ self.f.write(b'\x88\x58\x01\x00') # Byterate (88200) TODO
+ self.f.write(b'\x04\x00') # Blockalign (4)
+ self.f.write(b'\x10\x00') # Bits per sample (16)
+
+ # Data subchunk
+ self.f.write(b'data')
+ self.f.write(b'\xff\xff\x00\x00') # Subchunk size (65535 bytes) TODO
+
+ self.f.flush()
+
+ def decode(self, ss, es, data):
+ ptype, pdata = data
+
+ if ptype != 'DATA':
+ return
+
+ channel, sample = pdata
+
+ if self.wrote_header == False:
+ self.write_wav_header()
+ self.wrote_header = True
+
+ # Output the next sample to 'filename'.
+ # TODO: Data: first left channel, then right channel.
+ if self.f != None:
+ # TODO: This currently assumes U32 samples, and converts to S16.
+ s = sample >> 16
+ if s >= 0x8000:
+ s -= 0x10000
+ lo, hi = s & 0xff, (s >> 8) & 0xff
+ self.f.write(bytes('%02x%02x' % (lo, hi), 'utf-8'))
+ self.f.flush()
+
projects / libsigrokdecode.git / commitdiff