provide audio quality option 添加下载音质的 CLI 选项 (#19)

* add .idea to gitignore

* provide audio quality options

* formatted by black && isort

* add property to audio_quality_enums get quality_id directly

* update Audio's audio_quality assignment

* modify audio_quality default value to 192

* modify default value of option --quality

* fix: reformatted style

Signed-off-by: jingfelix <jingfelix@outlook.com>

---------

Signed-off-by: jingfelix <jingfelix@outlook.com>
Co-authored-by: jingfelix <jingfelix@outlook.com>

.gitignore

@@ -138,4 +138,6 @@ temp/
 .vscode/
 .DS_Store
 
-.pdm-python
+.pdm-python
+
+.idea/

src/bilifm/audio.py

@@ -5,7 +5,7 @@
 import requests
 import typer
 
-from .util import get_signed_params
+from .util import AudioQualityEnums, get_signed_params
 
 
 class Audio:
@@ -16,7 +16,7 @@ class Audio:
 
     headers = {}
 
-    def __init__(self, bvid: str) -> None:
+    def __init__(self, bvid: str, audio_quality: AudioQualityEnums) -> None:
         if bvid is None:
             raise ValueError("bvid is None")
 
@@ -40,6 +40,8 @@ def __init__(self, bvid: str) -> None:
             "Referer": "https://www.bilibili.com/video/{bvid}".format(bvid=self.bvid),
         }
 
+        self.audio_quality = audio_quality.quality_id
+
         # 获取cid和title
         if len(bvid) == 12:
             # BV号
@@ -76,9 +78,29 @@ def download(self):
                     self.playUrl, params=params, headers=self.headers
                 ).json()
 
-                baseUrl = json["data"]["dash"]["audio"][0]["baseUrl"]
+                if json["data"] is None:
+                    typer.echo(
+                        f" `data` field is not valid with url: {self.playUrl} and params : {params}"
+                    )
+                    return
+
+                audio = json["data"]["dash"]["audio"]
+                if not audio:
+                    typer.echo(
+                        f" `audio` field is empty with url: {self.playUrl} and params : {params}"
+                    )
+                    return
+
+                base_url = None
+                for au in audio:
+                    if au["id"] == self.audio_quality:
+                        base_url = au["baseUrl"]
+
+                # no audio url corresponding to current audio quality
+                if base_url is None:
+                    base_url = audio[0]["baseUrl"]
 
-                response = requests.get(url=baseUrl, headers=self.headers, stream=True)
+                response = requests.get(url=base_url, headers=self.headers, stream=True)
 
                 total_size = int(response.headers.get("content-length", 0))
                 temp_size = 0

src/bilifm/command.py

@@ -7,24 +7,32 @@
 from .season import Season
 from .series import Series
 from .user import User
-from .util import Directory, Path
+from .util import AudioQuality, AudioQualityEnums, Directory, Path
 
 app = typer.Typer()
 
 
 @app.command()
-def bv(bv: str, directory: Directory = None):
-    audio = Audio(bv)
+def bv(
+    bv: str,
+    directory: Directory = None,
+    audio_quality: AudioQuality = AudioQualityEnums.k192.value,
+):
+    audio = Audio(bv, audio_quality)
     audio.download()
 
 
 @app.command()
-def uid(uid: str, directory: Directory = None):
+def uid(
+    uid: str,
+    directory: Directory = None,
+    audio_quality: AudioQuality = AudioQualityEnums.k192.value,
+):
     user = User(uid)
 
     for video in user.videos:
         bv = video["bvid"]
-        audio = Audio(bv)
+        audio = Audio(bv, audio_quality)
         audio.download()
 
     typer.echo("Download complete")
@@ -35,21 +43,27 @@ def fav(
     media_id: str,
     cookies_path: str = Path,
     directory: Directory = None,
+    audio_quality: AudioQuality = AudioQualityEnums.k192.value,
 ):
     with open(cookies_path, "r") as f:
         cookies = f.read()
 
     fav = Fav(media_id, cookies)
 
     for bvid in fav.id_list:
-        audio = Audio(bvid)
+        audio = Audio(bvid, audio_quality)
         audio.download()
 
     typer.echo("Download complete")
 
 
 @app.command()
-def season(uid: str, sid: str, directory: Directory = None):
+def season(
+    uid: str,
+    sid: str,
+    directory: Directory = None,
+    audio_quality: AudioQuality = AudioQualityEnums.k192.value,
+):
     sea = Season(uid, sid)
     audio_generator = sea.get_videos()
     if not audio_generator:
@@ -62,13 +76,18 @@ def season(uid: str, sid: str, directory: Directory = None):
 
     for audios in audio_generator:
         for id in audios:
-            audio = Audio(id)
+            audio = Audio(id, audio_quality)
             audio.download()
     typer.echo("Download complete")
 
 
 @app.command()
-def series(uid: str, sid: str, directory: Directory = None):
+def series(
+    uid: str,
+    sid: str,
+    directory: Directory = None,
+    audio_quality: AudioQuality = AudioQualityEnums.k64,
+):
     """Download bilibili video series
 
     The api of series lacks the series name, executing
@@ -82,6 +101,6 @@ def series(uid: str, sid: str, directory: Directory = None):
 
     for audios in audio_generator:
         for id in audios:
-            audio = Audio(id)
+            audio = Audio(id, audio_quality)
             audio.download()
     typer.echo("Download complete")

src/bilifm/util.py

@@ -2,6 +2,7 @@
 import random
 import time
 import urllib.parse
+from enum import Enum
 from functools import reduce
 from hashlib import md5
 from typing import Callable
@@ -97,6 +98,24 @@
 ]
 
 
+# 音质映射到具体值
+audio_quality_map = {
+    "64": 30216,
+    "132": 30232,
+    "192": 30280,
+}
+
+
+class AudioQualityEnums(str, Enum):
+    k64 = "64"
+    k132 = "132"
+    k192 = "192"
+
+    @property
+    def quality_id(self):
+        return audio_quality_map[self._value_]
+
+
 def getMixinKey(orig: str):
     "对 imgKey 和 subKey 进行字符顺序打乱编码"
     return reduce(lambda s, i: s + orig[i], mixinKeyEncTab, "")[:32]
@@ -214,3 +233,9 @@ def wrapped_request(*args, **kwargs):
             return None
 
         return wrapped_request
+
+
+AudioQuality = Annotated[
+    AudioQualityEnums,
+    typer.Option("--quality", "-q", help="audio quality", case_sensitive=False),
+]