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from lxml import etree
from typing import List, Union
import logging
from box import Box
class SSMLContext(Box):
def __init__(self, *args, **kwargs):
self.parent: Union[SSMLContext, None] = None
self.style = None
self.spk = None
self.volume = None
self.rate = None
self.pitch = None
# tempurature
self.temp = None
self.top_p = None
self.top_k = None
self.seed = None
self.noramalize = None
self.prompt1 = None
self.prompt2 = None
self.prefix = None
super().__init__(*args, **kwargs)
class SSMLSegment(Box):
def __init__(self, text: str, attrs=SSMLContext(), params=None):
self.attrs = SSMLContext(**attrs)
self.text = text
self.params = params
class SSMLBreak:
def __init__(self, duration_ms: Union[str, int, float]):
# TODO 支持其他单位
duration_ms = int(str(duration_ms).replace("ms", ""))
self.attrs = Box(**{"duration": duration_ms})
class SSMLParser:
def __init__(self):
self.logger = logging.getLogger(__name__)
self.logger.debug("SSMLParser.__init__()")
self.resolvers = []
def resolver(self, tag: str):
def decorator(func):
self.resolvers.append((tag, func))
return func
return decorator
def parse(self, ssml: str) -> List[Union[SSMLSegment, SSMLBreak]]:
root = etree.fromstring(ssml)
root_ctx = SSMLContext()
segments: List[Union[SSMLSegment, SSMLBreak]] = []
self.resolve(root, root_ctx, segments)
return segments
def resolve(
self, element: etree.Element, context: SSMLContext, segments: List[SSMLSegment]
):
resolver = [resolver for tag, resolver in self.resolvers if tag == element.tag]
if len(resolver) == 0:
raise NotImplementedError(f"Tag {element.tag} not supported.")
else:
resolver = resolver[0]
resolver(element, context, segments, self)
def create_ssml_parser():
parser = SSMLParser()
@parser.resolver("speak")
def tag_speak(
element: etree.Element,
context: Box,
segments: List[Union[SSMLSegment, SSMLBreak]],
parser: SSMLParser,
):
ctx = context.copy() if context is not None else SSMLContext()
version = element.get("version")
if version != "0.1":
raise ValueError(f"Unsupported SSML version {version}")
for child in element:
parser.resolve(child, ctx, segments)
@parser.resolver("voice")
def tag_voice(
element: etree.Element,
context: Box,
segments: List[Union[SSMLSegment, SSMLBreak]],
parser: SSMLParser,
):
ctx = context.copy() if context is not None else SSMLContext()
ctx.spk = element.get("spk", ctx.spk)
ctx.style = element.get("style", ctx.style)
ctx.spk = element.get("spk", ctx.spk)
ctx.volume = element.get("volume", ctx.volume)
ctx.rate = element.get("rate", ctx.rate)
ctx.pitch = element.get("pitch", ctx.pitch)
# tempurature
ctx.temp = element.get("temp", ctx.temp)
ctx.top_p = element.get("top_p", ctx.top_p)
ctx.top_k = element.get("top_k", ctx.top_k)
ctx.seed = element.get("seed", ctx.seed)
ctx.noramalize = element.get("noramalize", ctx.noramalize)
ctx.prompt1 = element.get("prompt1", ctx.prompt1)
ctx.prompt2 = element.get("prompt2", ctx.prompt2)
ctx.prefix = element.get("prefix", ctx.prefix)
# 处理 voice 开头的文本
if element.text and element.text.strip():
segments.append(SSMLSegment(element.text.strip(), ctx))
for child in element:
parser.resolve(child, ctx, segments)
# 处理 voice 结尾的文本
if child.tail and child.tail.strip():
segments.append(SSMLSegment(child.tail.strip(), ctx))
@parser.resolver("break")
def tag_break(
element: etree.Element,
context: Box,
segments: List[Union[SSMLSegment, SSMLBreak]],
parser: SSMLParser,
):
time_ms = int(element.get("time", "0").replace("ms", ""))
segments.append(SSMLBreak(time_ms))
@parser.resolver("prosody")
def tag_prosody(
element: etree.Element,
context: Box,
segments: List[Union[SSMLSegment, SSMLBreak]],
parser: SSMLParser,
):
ctx = context.copy() if context is not None else SSMLContext()
ctx.spk = element.get("spk", ctx.spk)
ctx.style = element.get("style", ctx.style)
ctx.spk = element.get("spk", ctx.spk)
ctx.volume = element.get("volume", ctx.volume)
ctx.rate = element.get("rate", ctx.rate)
ctx.pitch = element.get("pitch", ctx.pitch)
# tempurature
ctx.temp = element.get("temp", ctx.temp)
ctx.top_p = element.get("top_p", ctx.top_p)
ctx.top_k = element.get("top_k", ctx.top_k)
ctx.seed = element.get("seed", ctx.seed)
ctx.noramalize = element.get("noramalize", ctx.noramalize)
ctx.prompt1 = element.get("prompt1", ctx.prompt1)
ctx.prompt2 = element.get("prompt2", ctx.prompt2)
ctx.prefix = element.get("prefix", ctx.prefix)
if element.text and element.text.strip():
segments.append(SSMLSegment(element.text.strip(), ctx))
return parser
if __name__ == "__main__":
parser = create_ssml_parser()
ssml = """
<speak version="0.1">
<voice spk="xiaoyan" style="news">
<prosody rate="fast">你好</prosody>
<break time="500ms"/>
<prosody rate="slow">你好</prosody>
</voice>
</speak>
"""
segments = parser.parse(ssml)
for segment in segments:
if isinstance(segment, SSMLBreak):
print("<break>", segment.attrs)
elif isinstance(segment, SSMLSegment):
print(segment.text, segment.attrs)
else:
raise ValueError("Unknown segment type")
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