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61 lines
2.1 KiB
Python
61 lines
2.1 KiB
Python
###########################################
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# Project: CMSIS DSP Library
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# Title: WavSource.py
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# Description: Source node for reading wave files
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#
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# $Date: 06 August 2021
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# $Revision: V1.10.0
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#
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# Target Processor: Cortex-M and Cortex-A cores
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# -------------------------------------------------------------------- */
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#
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# Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed under the Apache License, Version 2.0 (the License); you may
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# not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an AS IS BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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############################################
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from sdf.schedule.simu import *
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import wave
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# It is assuming the input is a stereo file
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# It is not yet customizable in this version
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# Pad with zero when end of file is reached
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class WavSource(GenericSource):
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"Read a stereo wav with 16 bits encoding"
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def __init__(self,outputSize,fifoout,name,stereo=True):
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GenericSource.__init__(self,outputSize,fifoout)
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self._file=wave.open(name, 'rb')
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self._stereo=stereo
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#print(self._file.getnchannels())
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#print(self._file.getnframes())
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def run(self):
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a=self.getWriteBuffer()
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if self._stereo:
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# Stereo file so chunk must be divided by 2
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frame=np.frombuffer(self._file.readframes(self._outputSize//2),dtype=np.int16)
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else:
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frame=np.frombuffer(self._file.readframes(self._outputSize),dtype=np.int16)
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if frame.size > 0:
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a[:frame.size] = frame
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a[frame.size:] = 0
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return(0)
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else:
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a[:]=0
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return(0)
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def __del__(self):
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self._file.close() |