Question

我正在尝试创建一个Python脚本，该脚本能够打开音频文件，读取PCM数据，并使用此PCM数据输出另一个音频文件。（最终我希望能够将流程应用于数据）

我目前正在使用python audiotools，因为它似乎可以用相当多的格式来完成。

我已经设法读取数据并转换为浮点值的FramesList，这非常适合编辑，但我无法解决将处理后的FramesList写回.wav文件的过程。 to_bytes（）将数据转换为原始pcm字符串，但我不确定如何将这些原始数据恢复为wav文件？

from audiotools import *
from argparse import ArgumentParser

def get_info(audio_file, main_args):
    """
    create a dictionary of information for the audiofile object.

    """
    info = {}
    info["channels"] = audio_file.channels()
    info["channel_mask"] = audio_file.channel_mask()
    info["bits"] = audio_file.bits_per_sample()
    info["sample_rate"] = audio_file.sample_rate()
    info["frames"] = audio_file.total_frames()
    info["length"] = audio_file.seconds_length()
    info["seekable"] = audio_file.seekable()
    info["verified"] = audio_file.verify()
    info["chunks"] = audio_file.has_foreign_wave_chunks()
    info["available"] = audio_file.available(BIN)
    info["header"], info["footer"] = audio_file.wave_header_footer()

    if main_args.verbose:
        print "No. of Channels:\t\t", info["channels"]
        print "Channel mask:\t\t\t", info["channel_mask"]
        print "Bits per sample:\t\t", info["bits"], "BIT"
        print "Sample Rate:\t\t\t", (info["sample_rate"]/1000.0), "k"
        print "Number of Frames:\t\t", info["frames"]
        print "Audio Length:\t\t\t", info["length"], "seconds"
        print "Audio File Seekable?:\t\t", info["seekable"]
        print "File has foreign chunks?:\t", info["chunks"]
        print "Correct Binaries present?:\t", info["available"]
    return info

def main():
    parser = ArgumentParser()
    parser.add_argument(
        "-v",
        "--verbose",
        help = "Run program verbosely",
        default = False,
        action = "store_true",
    )

    main_args = parser.parse_args()

    #open audio file as an AudioFile object
    audio_file =  open("/Users/samperry/piano2.wav")
    file_info = get_info(audio_file, main_args)

    #Creates a WaveReader object from the AudioFile Object
    pcm_data = audio_file.to_pcm()

    #Creates a FrameList object from WaveReader object. Currently reads all
    #frames in file
    frame_list = pcm_data.read(file_info["frames"])

    #Convert samples to floats (-1.0 - +1.0)
    float_frame_list = frame_list.to_float()

    #eventually do some signal processing here...

    #Convert back to integer FrameList
    output_framelist = float_frame_list.to_int(file_info["bits"])

    #now back to raw bytes
    output_data = output_framelist.to_bytes(False, True)

if __name__ == "__main__":
    main()

Answer 1

您是否尝试过 PyDub ？它允许您使用简单易用的高级界面操作音频。

Answer 2

如果您只是使用wav文件，那么您可以使用wave python模块。它比audiotools简单得多。

如果您需要处理其他文件格式，并且不介意使用外部程序，您可以将原始数据输出到文件，然后使用sox将其转换为您想要的任何格式。登记/> 您可以查看有关阅读数据的this answer以获得一些想法。

使用Python AudioTools编辑Wave文件样本

2 个答案: