编辑python中的wav文件头以与QSound / pyqt5一起使用（Watson文本到语音TTS）

约翰·德巴吉斯

pyqt5的QSound一直给我带来麻烦，一些wav文件可以正常工作。其他原因导致Qt应用出错并无法运行。经过研究，我将罪魁祸首缩小到了wav文件的标题。

如果我在Audacity中打开wav文件并将其导出为wav文件，则导出的wav文件可以完美运行。但是我需要从我的python脚本中运行的解决方案。

我正在从Watson的Text-To-Speech api获取我的wav文件，不确定是否可以控制它包含的头文件。

import sys
from PyQt5.QtWidgets import QApplication, QLabel, QMainWindow
from PyQt5.QtCore import Qt
from PyQt5.QtMultimedia import QSound

from ibm_watson import TextToSpeechV1
from ibm_cloud_sdk_core.authenticators import IAMAuthenticator


def list_to_speech(text, language='ja-JP_EmiV3Voice'):
    api_key = "my_api_key"
    url = "url"

    # Set up service
    authenticator = IAMAuthenticator(api_key)
    # Now TTS service
    tts = TextToSpeechV1(authenticator=authenticator)
    # Set Service URL
    tts.set_service_url(url)
    with open('text_to_speech.wav', 'wb') as audio_file:
        res = tts.synthesize(text, accept='audio/wav', voice=language).get_result()
        audio_file.write(res.content)


class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.sound = QSound("text_to_speech.wav")
        self.sound.play()

        label = QLabel("This PyQt5 window will (try to) play the wav file!")
        label.setAlignment(Qt.AlignCenter)

        self.setCentralWidget(label)


if __name__ == "__main__":
    # the file saved by list_to_speech won't play as QSound(text_to_speech.wav).play()
    # (instead it crashes the app before opening)
    # 
    # if I open the text_to_speech.wav file in Audacity and export it with empty headers,
    # then comment out next line, it works.
    list_to_speech("ありがとう")
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    app.exec_()

永乐

一个可能的解决方案是不使用QSound，而是使用QMediaPlayer来处理其他编解码器：

import os
import sys

from PyQt5.QtWidgets import QApplication, QLabel, QMainWindow
from PyQt5.QtCore import Qt, QUrl
from PyQt5.QtMultimedia import QMediaPlayer, QMediaContent

CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))

# ...

class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        filename = os.path.join(CURRENT_DIR, "text_to_speech.wav")

        self.player = QMediaPlayer()
        url = QUrl.fromLocalFile(filename)
        self.player.setMedia(QMediaContent(url))
        self.player.play()

        label = QLabel("This PyQt5 window will (try to) play the wav file!")
        label.setAlignment(Qt.AlignCenter)

        self.setCentralWidget(label)

# ...

注意：另一种选择是使用其他格式，例如mp3。

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