feat: add custom audio file support

app/models/schema.py

@@ -81,7 +81,8 @@ class VideoParams(BaseModel):
     video_materials: Optional[List[MaterialInfo]] = (
         None  # Materials used to generate the video
     )
-
+    
+    custom_audio_file: Optional[str] = None  # Custom audio file path, will ignore video_script and disable subtitle
     video_language: Optional[str] = ""  # auto detect
 
     voice_name: Optional[str] = ""

app/services/task.py

@@ -71,30 +71,66 @@ def save_script_data(task_id, video_script, video_terms, params):
 
 
 def generate_audio(task_id, params, video_script):
+    '''
+    Generate audio for the video script.
+    If a custom audio file is provided, it will be used directly.
+    There will be no subtitle maker object returned in this case.
+    Otherwise, TTS will be used to generate the audio.
+    Returns:
+        - audio_file: path to the generated or provided audio file
+        - audio_duration: duration of the audio in seconds
+        - sub_maker: subtitle maker object if TTS is used, None otherwise
+    '''
     logger.info("\n\n## generating audio")
-    audio_file = path.join(utils.task_dir(task_id), "audio.mp3")
-    sub_maker = voice.tts(
-        text=video_script,
-        voice_name=voice.parse_voice_name(params.voice_name),
-        voice_rate=params.voice_rate,
-        voice_file=audio_file,
-    )
-    if sub_maker is None:
-        sm.state.update_task(task_id, state=const.TASK_STATE_FAILED)
-        logger.error(
-            """failed to generate audio:
+    custom_audio_file = params.custom_audio_file
+    if not custom_audio_file or not os.path.exists(custom_audio_file):
+        if custom_audio_file:
+            logger.warning(
+                f"custom audio file not found: {custom_audio_file}, using TTS to generate audio."
+            )
+        else:
+            logger.info("no custom audio file provided, using TTS to generate audio.")
+        audio_file = path.join(utils.task_dir(task_id), "audio.mp3")
+        sub_maker = voice.tts(
+            text=video_script,
+            voice_name=voice.parse_voice_name(params.voice_name),
+            voice_rate=params.voice_rate,
+            voice_file=audio_file,
+        )
+        if sub_maker is None:
+            sm.state.update_task(task_id, state=const.TASK_STATE_FAILED)
+            logger.error(
+                """failed to generate audio:
 1. check if the language of the voice matches the language of the video script.
 2. check if the network is available. If you are in China, it is recommended to use a VPN and enable the global traffic mode.
-        """.strip()
-        )
-        return None, None, None
-
-    audio_duration = math.ceil(voice.get_audio_duration(sub_maker))
-    return audio_file, audio_duration, sub_maker
-
+            """.strip()
+            )
+            return None, None, None
+        audio_duration = math.ceil(voice.get_audio_duration(sub_maker))
+        if audio_duration == 0:
+            sm.state.update_task(task_id, state=const.TASK_STATE_FAILED)
+            logger.error("failed to get audio duration.")
+            return None, None, None
+        return audio_file, audio_duration, sub_maker
+    else:
+        logger.info(f"using custom audio file: {custom_audio_file}")
+        audio_duration = voice.get_audio_duration(custom_audio_file)
+        if audio_duration == 0:
+            sm.state.update_task(task_id, state=const.TASK_STATE_FAILED)
+            logger.error("failed to get audio duration from custom audio file.")
+            return None, None, None
+        return custom_audio_file, audio_duration, None
 
 def generate_subtitle(task_id, params, video_script, sub_maker, audio_file):
-    if not params.subtitle_enabled:
+    '''
+    Generate subtitle for the video script.
+    If subtitle generation is disabled or no subtitle maker is provided, it will return an empty string.
+    Otherwise, it will generate the subtitle using the specified provider.
+    Returns:
+        - subtitle_path: path to the generated subtitle file
+    '''
+    logger.info("\n\n## generating subtitle")
+    if not params.subtitle_enabled or sub_maker is None:
         return ""
 
     subtitle_path = path.join(utils.task_dir(task_id), "subtitle.srt")

app/services/voice.py

@@ -11,6 +11,7 @@ from edge_tts import SubMaker, submaker
 from edge_tts.submaker import mktimestamp
 from loguru import logger
 from moviepy.video.tools import subtitles
+from moviepy.audio.io.AudioFileClip import AudioFileClip
 
 from app.config import config
 from app.utils import utils
@@ -1486,7 +1487,7 @@ def create_subtitle(sub_maker: submaker.SubMaker, text: str, subtitle_file: str)
         logger.error(f"failed, error: {str(e)}")
 
 
-def get_audio_duration(sub_maker: submaker.SubMaker):
+def _get_audio_duration_from_submaker(sub_maker: submaker.SubMaker):
     """
     获取音频时长
     """
@@ -1494,6 +1495,35 @@ def get_audio_duration(sub_maker: submaker.SubMaker):
         return 0.0
     return sub_maker.offset[-1][1] / 10000000
 
+def _get_audio_duration_from_mp3(mp3_file: str) -> float:
+    """
+    获取MP3音频时长
+    """
+    if not os.path.exists(mp3_file):
+        logger.error(f"MP3 file does not exist: {mp3_file}")
+        return 0.0
+
+    try:
+        # Use moviepy to get the duration of the MP3 file
+        with AudioFileClip(mp3_file) as audio:
+            return audio.duration  # Duration in seconds
+    except Exception as e:
+        logger.error(f"Failed to get audio duration from MP3: {str(e)}")
+        return 0.0
+
+def get_audio_duration( target: Union[str, submaker.SubMaker]) -> float:
+    """
+    获取音频时长
+    如果是SubMaker对象，则从SubMaker中获取时长
+    如果是MP3文件，则从MP3文件中获取时长
+    """
+    if isinstance(target, submaker.SubMaker):
+        return _get_audio_duration_from_submaker(target)
+    elif isinstance(target, str) and target.endswith(".mp3"):
+        return _get_audio_duration_from_mp3(target)
+    else:
+        logger.error(f"Invalid target type: {type(target)}")
+        return 0.0
 
 if __name__ == "__main__":
     voice_name = "zh-CN-XiaoxiaoMultilingualNeural-V2-Female"