326 lines
10 KiB
Python
Executable File
326 lines
10 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright 2017 Graham Norbury
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#
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# Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 Max H. Parke KA1RBI
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#
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# This file is part of OP25
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#
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# OP25 is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# OP25 is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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# License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with OP25; see the file COPYING. If not, write to the Free
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# Software Foundation, Inc., 51 Franklin Street, Boston, MA
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# 02110-1301, USA.
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from ctypes import *
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import sys
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import time
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import threading
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import socket
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import errno
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# OP25 defaults
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PCM_RATE = 8000 # audio sample rate (Hz)
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PCM_BUFFER_SIZE = 4000 # size of ALSA buffer in frames
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MAX_SUPERFRAME_SIZE = 320 # maximum size of incoming UDP audio buffer
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# Debug
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LOG_AUDIO_XRUNS = True # log audio underruns to stderr
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# Alsa PCM constants
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SND_PCM_FORMAT_S8 = c_int(0)
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SND_PCM_FORMAT_U8 = c_int(1)
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SND_PCM_FORMAT_S16_LE = c_int(2)
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SND_PCM_FORMAT_S16_BE = c_int(3)
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SND_PCM_FORMAT_U16_LE = c_int(4)
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SND_PCM_FORMAT_U16_BE = c_int(5)
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SND_PCM_FORMAT_S24_LE = c_int(6)
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SND_PCM_FORMAT_S24_BE = c_int(7)
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SND_PCM_FORMAT_U24_LE = c_int(8)
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SND_PCM_FORMAT_U24_BE = c_int(9)
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SND_PCM_FORMAT_S32_LE = c_int(10)
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SND_PCM_FORMAT_S32_BE = c_int(11)
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SND_PCM_FORMAT_U32_LE = c_int(12)
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SND_PCM_FORMAT_U32_BE = c_int(13)
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SND_PCM_FORMAT_FLOAT_LE = c_int(14)
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SND_PCM_FORMAT_FLOAT_BE = c_int(15)
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SND_PCM_FORMAT_FLOAT64_LE = c_int(16)
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SND_PCM_FORMAT_FLOAT64_BE = c_int(17)
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SND_PCM_FORMAT_IEC958_SUBFRAME_LE = c_int(18)
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SND_PCM_FORMAT_IEC958_SUBFRAME_BE = c_int(19)
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SND_PCM_FORMAT_MU_LAW = c_int(20)
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SND_PCM_FORMAT_A_LAW = c_int(21)
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SND_PCM_FORMAT_IMA_ADPCM = c_int(22)
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SND_PCM_FORMAT_MPEG = c_int(23)
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SND_PCM_FORMAT_GSM = c_int(24)
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SND_PCM_FORMAT_SPECIAL = c_int(31)
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SND_PCM_FORMAT_S24_3LE = c_int(32)
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SND_PCM_FORMAT_S24_3BE = c_int(33)
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SND_PCM_FORMAT_U24_3LE = c_int(34)
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SND_PCM_FORMAT_U24_3BE = c_int(35)
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SND_PCM_FORMAT_S20_3LE = c_int(36)
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SND_PCM_FORMAT_S20_3BE = c_int(37)
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SND_PCM_FORMAT_U20_3LE = c_int(38)
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SND_PCM_FORMAT_U20_3BE = c_int(39)
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SND_PCM_FORMAT_S18_3LE = c_int(40)
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SND_PCM_FORMAT_S18_3BE = c_int(41)
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SND_PCM_FORMAT_U18_3LE = c_int(42)
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SND_PCM_FORMAT_U18_3BE = c_int(43)
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SND_PCM_FORMAT_S16 = c_int(2)
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SND_PCM_FORMAT_U16 = c_int(4)
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SND_PCM_FORMAT_S24 = c_int(6)
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SND_PCM_FORMAT_U24 = c_int(8)
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SND_PCM_FORMAT_S32 = c_int(10)
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SND_PCM_FORMAT_U32 = c_int(12)
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SND_PCM_FORMAT_FLOAT = c_int(14)
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SND_PCM_FORMAT_FLOAT64 = c_int(16)
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SND_PCM_FORMAT_IEC958_SUBFRAME = c_int(18)
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SND_PCM_FORMAT_LAST = SND_PCM_FORMAT_U18_3BE
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SND_PCM_NORMAL = c_int(0x00000000)
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SND_PCM_NONBLOCK = c_int(0x00000001)
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SND_PCM_STREAM_PLAYBACK = c_int(0)
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SND_PCM_STREAM_CAPTURE = c_int(1)
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SND_PCM_STREAM_LAST = SND_PCM_STREAM_CAPTURE
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SND_PCM_ACCESS_MMAP_INTERLEAVED = c_int(0)
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SND_PCM_ACCESS_MMAP_NONINTERLEAVED = c_int(1)
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SND_PCM_ACCESS_MMAP_COMPLEX = c_int(2)
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SND_PCM_ACCESS_RW_INTERLEAVED = c_int(3)
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SND_PCM_ACCESS_RW_NONINTERLEAVED = c_int(4)
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SND_PCM_ACCESS_LAST = SND_PCM_ACCESS_RW_NONINTERLEAVED
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# Python CTypes wrapper to Alsa libasound2
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class alsasound(object):
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def __init__(self):
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self.libasound = cdll.LoadLibrary("libasound.so.2")
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self.c_pcm = c_void_p()
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self.format = 0
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self.channels = 0
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self.rate = 0
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self.framesize = 0
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def open(self, hwdev):
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b_hwdev = create_string_buffer(str.encode(hwdev))
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c_stream = SND_PCM_STREAM_PLAYBACK
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err = self.libasound.snd_pcm_open(byref(self.c_pcm), b_hwdev, c_stream, SND_PCM_NORMAL)
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return err
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def close(self):
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if (self.c_pcm.value == None):
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return
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self.libasound.snd_pcm_close(self.c_pcm)
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self.c_pcm.value = None
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def setup(self, pcm_format, pcm_channels, pcm_rate, pcm_buffer_size):
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if (self.c_pcm.value == None):
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return
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self.format = pcm_format
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self.channels = pcm_channels
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self.rate = pcm_rate
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pcm_buf_sz = c_ulong(pcm_buffer_size)
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c_pars = (c_void_p * int(self.libasound.snd_pcm_hw_params_sizeof() / sizeof(c_void_p)))()
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err = self.libasound.snd_pcm_hw_params_any(self.c_pcm, c_pars)
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if err < 0:
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sys.stderr.write("hw_params_any failed: %d\n" % err)
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return err
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err = self.libasound.snd_pcm_hw_params_set_access(self.c_pcm, c_pars, SND_PCM_ACCESS_RW_INTERLEAVED)
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if err < 0:
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sys.stderr.write("set_access failed: %d\n" % err)
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return err
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err = self.libasound.snd_pcm_hw_params_set_format(self.c_pcm, c_pars, c_uint(self.format))
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if err < 0:
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sys.stderr.write("set_format failed: %d\n" % err)
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return err
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err = self.libasound.snd_pcm_hw_params_set_channels(self.c_pcm, c_pars, c_uint(self.channels))
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if err < 0:
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sys.stderr.write("set_channels failed: %d\n" % err)
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return err
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err = self.libasound.snd_pcm_hw_params_set_rate(self.c_pcm, c_pars, c_uint(self.rate), c_int(0))
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if err < 0:
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sys.stderr.write("set_rate failed: %d\n" % err)
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return err
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err = self.libasound.snd_pcm_hw_params_set_buffer_size_near(self.c_pcm, c_pars, byref(pcm_buf_sz))
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if err < 0:
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sys.stderr.write("set_buffer_size_near failed: %d\n" % err)
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return err
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if pcm_buf_sz.value != pcm_buffer_size:
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sys.stderr.write("set_buffer_size_near requested %d, but returned %d\n" % (pcm_buffer_size, pcm_buf_sz.value))
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err = self.libasound.snd_pcm_hw_params(self.c_pcm, c_pars)
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if err < 0:
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sys.stderr.write("hw_params failed: %d\n" % err)
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return err
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self.libasound.snd_pcm_hw_params_current(self.c_pcm, c_pars)
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c_bits = self.libasound.snd_pcm_hw_params_get_sbits(c_pars)
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self.framesize = self.channels * c_bits/8
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c_sw_pars = (c_void_p * int(self.libasound.snd_pcm_sw_params_sizeof() / sizeof(c_void_p)))()
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err = self.libasound.snd_pcm_sw_params_current(self.c_pcm, c_sw_pars)
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if err < 0:
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sys.stderr.write("get_sw_params_current failed: %d\n" % err)
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return err
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pcm_start_threshold = int(pcm_buf_sz.value * 0.75)
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err = self.libasound.snd_pcm_sw_params_set_start_threshold(self.c_pcm, c_sw_pars, c_uint(pcm_start_threshold))
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if err < 0:
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sys.stderr.write("set_sw_params_start_threshold failed: %d\n" % err)
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return err
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err = self.libasound.snd_pcm_sw_params(self.c_pcm, c_sw_pars)
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if err < 0:
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sys.stderr.write("sw_params failed: %d\n" % err)
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return err
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ret = self.libasound.snd_pcm_prepare(self.c_pcm)
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#self.dump()
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return ret
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def write(self, pcm_data):
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datalen = len(pcm_data)
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n_frames = c_ulong(datalen / self.framesize)
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c_data = c_char_p(pcm_data)
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ret = 0
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if (self.c_pcm.value == None):
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sys.stderr.write("PCM device is closed\n")
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return -1
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ret = self.libasound.snd_pcm_writei(self.c_pcm, cast(c_data, POINTER(c_void_p)), n_frames)
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if (ret < 0):
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if (ret == -errno.EPIPE): # underrun
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if (LOG_AUDIO_XRUNS):
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sys.stderr.write("%f PCM underrun\n" % time.time())
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ret = self.libasound.snd_pcm_recover(self.c_pcm, ret, 1)
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if (ret >= 0):
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ret = self.libasound.snd_pcm_writei(self.c_pcm, cast(c_data, POINTER(c_void_p)), n_frames)
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else:
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ret = self.libasound.snd_pcm_prepare(self.c_pcm)
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ret = self.libasound.snd_pcm_writei(self.c_pcm, cast(c_data, POINTER(c_void_p)), n_frames)
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elif (ret == -errno.ESTRPIPE): # suspended
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while True:
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ret = self.libasound.snd_pcm_resume(self.c_pcm)
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if (ret != -errno.EAGAIN):
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break
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time.sleep(1)
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if (ret < 0):
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ret = self.libasound.snd_pcm_prepare(self.c_pcm)
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elif (ret < 0): # other error
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ret = self.libasound.snd_pcm_prepare(self.c_pcm)
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return ret
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def drain(self):
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ret = self.libasound.snd_pcm_drain(self.c_pcm)
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if (ret == -errno.ESTRPIPE): # suspended
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while True:
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ret = self.libasound.snd_pcm_resume(self.c_pcm)
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if (ret != -errno.EAGAIN):
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break
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time.sleep(1)
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ret = self.libasound.snd_pcm_prepare(self.c_pcm)
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def drop(self):
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ret = self.libasound.snd_pcm_drop(self.c_pcm)
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if (ret == -errno.ESTRPIPE): # suspended
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while True:
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ret = self.libasound.snd_pcm_resume(self.c_pcm)
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if (ret != -errno.EAGAIN):
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break
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time.sleep(1)
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ret = self.libasound.snd_pcm_prepare(self.c_pcm)
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def dump(self):
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if (self.c_pcm.value == None):
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return
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c_buf_p = c_void_p()
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c_str_p = c_char_p()
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c_strlen = c_uint(0)
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self.libasound.snd_output_buffer_open(byref(c_buf_p))
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self.libasound.snd_pcm_dump_setup(self.c_pcm, c_buf_p)
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c_strlen = self.libasound.snd_output_buffer_string(c_buf_p, byref(c_str_p))
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sys.stderr.write("%s\n" % c_str_p.value[0:c_strlen-1])
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self.libasound.snd_output_close(c_buf_p)
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# OP25 thread to receive UDP audio samples and send to Alsa driver
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class socket_audio(threading.Thread):
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def __init__(self, udp_host, udp_port, pcm_device, **kwds):
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threading.Thread.__init__(self, **kwds)
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self.setDaemon(1)
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self.keep_running = True
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self.sock = None
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self.pcm = alsasound()
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self.setup_socket(udp_host, udp_port)
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self.setup_pcm(pcm_device)
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self.start()
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return
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def run(self):
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while self.keep_running:
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# Data received on the udp port is 320 bytes for an audio frame or 2 bytes for a flag
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#
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d = self.sock.recvfrom(MAX_SUPERFRAME_SIZE) # recvfrom blocks until data becomes available
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if d[0]:
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d_len = len(d[0])
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if (d_len == 2): # flag
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flag = ord(d[0][0]) + (ord(d[0][1]) << 8) # 16 bit little endian
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if (flag == 0): # 0x0000 = drain pcm buffer
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self.pcm.drain()
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elif (flag == 1): # 0x0001 = flush pcm buffer
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self.pcm.drop()
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else: # audio data
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self.pcm.write(d[0])
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else:
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break
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self.close_socket()
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self.close_pcm()
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return
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def stop(self):
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self.keep_running = False
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return
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def setup_socket(self, udp_host, udp_port):
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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self.sock.bind((udp_host, udp_port))
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return
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def close_socket(self):
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self.sock.close()
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return
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def setup_pcm(self, hwdevice):
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sys.stderr.write('audio device: %s\n' % hwdevice)
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err = self.pcm.open(hwdevice)
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if err < 0:
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sys.stderr.write('failed to open audio device: %s\n' % hwdevice)
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self.pcm.dump()
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self.keep_running = False
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return
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err = self.pcm.setup(SND_PCM_FORMAT_S16_LE.value, 1, PCM_RATE, PCM_BUFFER_SIZE)
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if err < 0:
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sys.stderr.write('failed to set up pcm stream\n')
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self.keep_running = False
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return
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return
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def close_pcm(self):
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self.pcm.close()
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return
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