913 lines
36 KiB
Python
913 lines
36 KiB
Python
from __future__ import annotations
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from librespot import util
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from librespot.audio.decrypt import AesAudioDecrypt
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from librespot.audio.format import SuperAudioFormat
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from librespot.audio.storage import ChannelManager
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from librespot.cache import CacheManager
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from librespot.crypto import Packet
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from librespot.metadata import EpisodeId, PlayableId, TrackId
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from librespot.proto import Metadata_pb2 as Metadata, StorageResolve_pb2 as StorageResolve
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from librespot.structure import AudioDecrypt, AudioQualityPicker, Closeable, FeederException, GeneralAudioStream, GeneralWritableStream, HaltListener, NoopAudioDecrypt, PacketsReceiver
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import concurrent.futures
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import io
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import logging
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import math
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import queue
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import random
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import struct
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import threading
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import time
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import typing
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import urllib.parse
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if typing.TYPE_CHECKING:
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from librespot.core import Session
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class AbsChunkedInputStream(io.BytesIO, HaltListener):
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chunk_exception = None
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closed = False
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max_chunk_tries = 128
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preload_ahead = 3
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preload_chunk_retries = 2
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retries: typing.List[int]
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retry_on_chunk_error: bool
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wait_lock: threading.Condition = threading.Condition()
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wait_for_chunk = -1
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__decoded_length = 0
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__mark = 0
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__pos = 0
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def __init__(self, retry_on_chunk_error: bool):
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super().__init__()
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self.retries = [0] * self.chunks()
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self.retry_on_chunk_error = retry_on_chunk_error
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def is_closed(self) -> bool:
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return self.closed
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def buffer(self) -> typing.List[bytes]:
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raise NotImplementedError()
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def size(self) -> int:
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raise NotImplementedError()
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def close(self) -> None:
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self.closed = True
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with self.wait_lock:
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self.wait_lock.notify_all()
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def available(self):
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return self.size() - self.__pos
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def mark_supported(self) -> bool:
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return True
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def mark(self, read_ahead_limit: int) -> None:
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self.__mark = self.__pos
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def reset(self) -> None:
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self.__pos = self.__mark
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def pos(self) -> int:
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return self.__pos
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def seek(self, where: int, **kwargs) -> None:
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if where < 0:
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raise TypeError()
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if self.closed:
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raise IOError("Stream is closed!")
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self.__pos = where
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self.check_availability(int(self.__pos / (128 * 1024)), False, False)
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def skip(self, n: int) -> int:
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if n < 0:
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raise TypeError()
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if self.closed:
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raise IOError("Stream is closed!")
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k = self.size() - self.__pos
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if n < k:
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k = n
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self.__pos += k
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chunk = int(self.__pos / (128 * 1024))
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self.check_availability(chunk, False, False)
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return k
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def requested_chunks(self) -> typing.List[bool]:
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raise NotImplementedError()
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def available_chunks(self) -> typing.List[bool]:
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raise NotImplementedError()
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def chunks(self) -> int:
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raise NotImplementedError()
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def request_chunk_from_stream(self, index: int) -> None:
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raise NotImplementedError()
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def should_retry(self, chunk: int) -> bool:
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if self.retries[chunk] < 1:
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return True
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if self.retries[chunk] > self.max_chunk_tries:
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return False
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return self.retry_on_chunk_error
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def check_availability(self, chunk: int, wait: bool, halted: bool) -> None:
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if halted and not wait:
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raise TypeError()
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if not self.requested_chunks()[chunk]:
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self.request_chunk_from_stream(chunk)
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self.requested_chunks()[chunk] = True
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for i in range(chunk + 1,
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min(self.chunks() - 1, chunk + self.preload_ahead) + 1):
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if (self.requested_chunks()[i]
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and self.retries[i] < self.preload_chunk_retries):
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self.request_chunk_from_stream(i)
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self.requested_chunks()[chunk] = True
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if wait:
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if self.available_chunks()[chunk]:
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return
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retry = False
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with self.wait_lock:
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if not halted:
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self.stream_read_halted(chunk, int(time.time() * 1000))
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self.chunk_exception = None
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self.wait_for_chunk = chunk
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self.wait_lock.wait_for(lambda: self.available_chunks()[chunk])
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if self.closed:
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return
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if self.chunk_exception is not None:
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if self.should_retry(chunk):
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retry = True
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else:
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raise AbsChunkedInputStream.ChunkException
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if not retry:
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self.stream_read_halted(chunk, int(time.time() * 1000))
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if retry:
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time.sleep(math.log10(self.retries[chunk]))
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self.check_availability(chunk, True, True)
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def read(self, __size: int = 0) -> bytes:
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if self.closed:
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raise IOError("Stream is closed!")
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if __size <= 0:
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if self.__pos == self.size():
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return b""
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buffer = io.BytesIO()
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total_size = self.size()
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chunk = int(self.__pos / (128 * 1024))
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chunk_off = int(self.__pos % (128 * 1024))
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chunk_total = int(math.ceil(total_size / (128 * 1024)))
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self.check_availability(chunk, True, False)
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buffer.write(self.buffer()[chunk][chunk_off:])
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chunk += 1
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if chunk != chunk_total:
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while chunk <= chunk_total - 1:
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self.check_availability(chunk, True, False)
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buffer.write(self.buffer()[chunk])
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chunk += 1
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buffer.seek(0)
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self.__pos += buffer.getbuffer().nbytes
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return buffer.read()
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buffer = io.BytesIO()
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chunk = int(self.__pos / (128 * 1024))
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chunk_off = int(self.__pos % (128 * 1024))
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chunk_end = int(__size / (128 * 1024))
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chunk_end_off = int(__size % (128 * 1024))
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if chunk_end > self.size():
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chunk_end = int(self.size() / (128 * 1024))
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chunk_end_off = int(self.size() % (128 * 1024))
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self.check_availability(chunk, True, False)
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if chunk_off + __size > len(self.buffer()[chunk]):
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buffer.write(self.buffer()[chunk][chunk_off:])
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chunk += 1
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while chunk <= chunk_end:
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self.check_availability(chunk, True, False)
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if chunk == chunk_end:
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buffer.write(self.buffer()[chunk][:chunk_end_off])
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else:
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buffer.write(self.buffer()[chunk])
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chunk += 1
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else:
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buffer.write(self.buffer()[chunk][chunk_off:chunk_off + __size])
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buffer.seek(0)
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self.__pos += buffer.getbuffer().nbytes
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return buffer.read()
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def notify_chunk_available(self, index: int) -> None:
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self.available_chunks()[index] = True
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self.__decoded_length += len(self.buffer()[index])
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with self.wait_lock:
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if index == self.wait_for_chunk and not self.closed:
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self.wait_for_chunk = -1
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self.wait_lock.notify_all()
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def notify_chunk_error(self, index: int, ex):
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self.available_chunks()[index] = False
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self.requested_chunks()[index] = False
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self.retries[index] += 1
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with self.wait_lock:
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if index == self.wait_for_chunk and not self.closed:
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self.chunk_exception = ex
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self.wait_for_chunk = -1
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self.wait_lock.notify_all()
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def decoded_length(self):
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return self.__decoded_length
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class ChunkException(IOError):
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@staticmethod
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def from_stream_error(stream_error: int):
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return AbsChunkedInputStream \
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.ChunkException("Failed due to stream error, code: {}".format(stream_error))
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class AudioKeyManager(PacketsReceiver, Closeable):
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audio_key_request_timeout = 20
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logger = logging.getLogger("Librespot:AudioKeyManager")
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__callbacks: typing.Dict[int, Callback] = {}
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__seq_holder = 0
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__seq_holder_lock = threading.Condition()
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__session: Session
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__zero_short = b"\x00\x00"
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def __init__(self, session: Session):
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self.__session = session
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def dispatch(self, packet: Packet) -> None:
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payload = io.BytesIO(packet.payload)
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seq = struct.unpack(">i", payload.read(4))[0]
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callback = self.__callbacks.get(seq)
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if callback is None:
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self.logger.warning(
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"Couldn't find callback for seq: {}".format(seq))
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return
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if packet.is_cmd(Packet.Type.aes_key):
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key = payload.read(16)
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callback.key(key)
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elif packet.is_cmd(Packet.Type.aes_key_error):
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code = struct.unpack(">H", payload.read(2))[0]
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callback.error(code)
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else:
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self.logger.warning(
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"Couldn't handle packet, cmd: {}, length: {}".format(
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packet.cmd, len(packet.payload)))
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def get_audio_key(self,
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gid: bytes,
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file_id: bytes,
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retry: bool = True) -> bytes:
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seq: int
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with self.__seq_holder_lock:
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seq = self.__seq_holder
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self.__seq_holder += 1
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out = io.BytesIO()
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out.write(file_id)
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out.write(gid)
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out.write(struct.pack(">i", seq))
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out.write(self.__zero_short)
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out.seek(0)
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self.__session.send(Packet.Type.request_key, out.read())
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callback = AudioKeyManager.SyncCallback(self)
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self.__callbacks[seq] = callback
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key = callback.wait_response()
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if key is None:
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if retry:
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return self.get_audio_key(gid, file_id, False)
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raise RuntimeError(
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"Failed fetching audio key! gid: {}, fileId: {}".format(
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util.bytes_to_hex(gid), util.bytes_to_hex(file_id)))
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return key
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class Callback:
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def key(self, key: bytes) -> None:
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raise NotImplementedError
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def error(self, code: int) -> None:
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raise NotImplementedError
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class SyncCallback(Callback):
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__audio_key_manager: AudioKeyManager
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__reference = queue.Queue()
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__reference_lock = threading.Condition()
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def __init__(self, audio_key_manager: AudioKeyManager):
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self.__audio_key_manager = audio_key_manager
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def key(self, key: bytes) -> None:
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with self.__reference_lock:
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self.__reference.put(key)
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self.__reference_lock.notify_all()
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def error(self, code: int) -> None:
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self.__audio_key_manager.logger.fatal(
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"Audio key error, code: {}".format(code))
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with self.__reference_lock:
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self.__reference.put(None)
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self.__reference_lock.notify_all()
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def wait_response(self) -> bytes:
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with self.__reference_lock:
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self.__reference_lock.wait(
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AudioKeyManager.audio_key_request_timeout)
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return self.__reference.get(block=False)
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class CdnFeedHelper:
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_LOGGER: logging = logging.getLogger(__name__)
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@staticmethod
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def get_url(resp: StorageResolve.StorageResolveResponse) -> str:
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selected_url = random.choice(resp.cdnurl)
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while "audio4-gm-fb" in selected_url or "audio-gm-fb" in selected_url:
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selected_url = random.choice(resp.cdnurl)
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return selected_url
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@staticmethod
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def load_track(
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session: Session, track: Metadata.Track, file: Metadata.AudioFile,
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resp_or_url: typing.Union[StorageResolve.StorageResolveResponse,
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str], preload: bool,
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halt_listener: HaltListener) -> PlayableContentFeeder.LoadedStream:
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if type(resp_or_url) is str:
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url = resp_or_url
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else:
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url = CdnFeedHelper.get_url(resp_or_url)
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start = int(time.time() * 1000)
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key = session.audio_key().get_audio_key(track.gid, file.file_id)
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audio_key_time = int(time.time() * 1000) - start
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streamer = session.cdn().stream_file(file, key, url, halt_listener)
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input_stream = streamer.stream()
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normalization_data = NormalizationData.read(input_stream)
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if input_stream.skip(0xA7) != 0xA7:
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raise IOError("Couldn't skip 0xa7 bytes!")
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return PlayableContentFeeder.LoadedStream(
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track,
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streamer,
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normalization_data,
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PlayableContentFeeder.Metrics(file.file_id, preload,
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-1 if preload else audio_key_time),
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)
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@staticmethod
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def load_episode_external(
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session: Session, episode: Metadata.Episode,
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halt_listener: HaltListener) -> PlayableContentFeeder.LoadedStream:
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resp = session.client().head(episode.external_url)
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if resp.status_code != 200:
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CdnFeedHelper._LOGGER.warning("Couldn't resolve redirect!")
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url = resp.url
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CdnFeedHelper._LOGGER.debug("Fetched external url for {}: {}".format(
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util.bytes_to_hex(episode.gid), url))
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streamer = session.cdn().stream_external_episode(
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episode, url, halt_listener)
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return PlayableContentFeeder.LoadedStream(
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episode,
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streamer,
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None,
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PlayableContentFeeder.Metrics(None, False, -1),
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)
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@staticmethod
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def load_episode(
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session: Session,
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episode: Metadata.Episode,
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file: Metadata.AudioFile,
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resp_or_url: typing.Union[StorageResolve.StorageResolveResponse, str],
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preload: bool,
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halt_listener: HaltListener,
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) -> PlayableContentFeeder.LoadedStream:
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if type(resp_or_url) is str:
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url = resp_or_url
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else:
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url = CdnFeedHelper.get_url(resp_or_url)
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start = int(time.time() * 1000)
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key = session.audio_key().get_audio_key(episode.gid, file.file_id)
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audio_key_time = int(time.time() * 1000) - start
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streamer = session.cdn().stream_file(file, key, url, halt_listener)
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input_stream = streamer.stream()
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normalization_data = NormalizationData.read(input_stream)
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if input_stream.skip(0xA7) != 0xA7:
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raise IOError("Couldn't skip 0xa7 bytes!")
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return PlayableContentFeeder.LoadedStream(
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episode,
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streamer,
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normalization_data,
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PlayableContentFeeder.Metrics(file.file_id, preload,
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-1 if preload else audio_key_time),
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)
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class CdnManager:
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logger: logging = logging.getLogger("Librespot:CdnManager")
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__session: Session
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def __init__(self, session: Session):
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self.__session = session
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def get_head(self, file_id: bytes):
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response = self.__session.client() \
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.get(self.__session.get_user_attribute("head-files-url", "https://heads-fa.spotify.com/head/{file_id}")
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.replace("{file_id}", util.bytes_to_hex(file_id)))
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if response.status_code != 200:
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raise IOError("{}".format(response.status_code))
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body = response.content
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if body is None:
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raise IOError("Response body is empty!")
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return body
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def stream_external_episode(self, episode: Metadata.Episode,
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external_url: str,
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halt_listener: HaltListener):
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return CdnManager.Streamer(
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self.__session,
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StreamId(episode=episode),
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SuperAudioFormat.MP3,
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CdnManager.CdnUrl(self, None, external_url),
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self.__session.cache(),
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NoopAudioDecrypt(),
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halt_listener,
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)
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def stream_file(self, file: Metadata.AudioFile, key: bytes, url: str,
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halt_listener: HaltListener):
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return CdnManager.Streamer(
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self.__session,
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StreamId(file=file),
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SuperAudioFormat.get(file.format),
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CdnManager.CdnUrl(self, file.file_id, url),
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self.__session.cache(),
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AesAudioDecrypt(key),
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halt_listener,
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)
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|
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def get_audio_url(self, file_id: bytes):
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response = self.__session.api()\
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.send("GET", "/storage-resolve/files/audio/interactive/{}".format(util.bytes_to_hex(file_id)), None, None)
|
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if response.status_code != 200:
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raise IOError(response.status_code)
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body = response.content
|
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if body is None:
|
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raise IOError("Response body is empty!")
|
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proto = StorageResolve.StorageResolveResponse()
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proto.ParseFromString(body)
|
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if proto.result == StorageResolve.StorageResolveResponse.Result.CDN:
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url = random.choice(proto.cdnurl)
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self.logger.debug("Fetched CDN url for {}: {}".format(
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util.bytes_to_hex(file_id), url))
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return url
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raise CdnManager.CdnException(
|
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"Could not retrieve CDN url! result: {}".format(proto.result))
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|
|
class CdnException(Exception):
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pass
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|
|
class InternalResponse:
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buffer: bytes
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headers: typing.Dict[str, str]
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|
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def __init__(self, buffer: bytes, headers: typing.Dict[str, str]):
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self.buffer = buffer
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self.headers = headers
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|
|
class CdnUrl:
|
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__cdn_manager = None
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|
__file_id: bytes
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__expiration: int
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url: str
|
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|
|
def __init__(self, cdn_manager, file_id: typing.Union[bytes, None],
|
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url: str):
|
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self.__cdn_manager: CdnManager = cdn_manager
|
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self.__file_id = file_id
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self.set_url(url)
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|
|
def url(self):
|
|
if self.__expiration == -1:
|
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return self.url
|
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if self.__expiration <= int(time.time() * 1000) + 5 * 60 * 1000:
|
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self.url = self.__cdn_manager.get_audio_url(self.__file_id)
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return self.url
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|
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def set_url(self, url: str):
|
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self.url = url
|
|
if self.__file_id is not None:
|
|
token_url = urllib.parse.urlparse(url)
|
|
token_query = urllib.parse.parse_qs(token_url.query)
|
|
token_list = token_query.get("__token__")
|
|
try:
|
|
token_str = str(token_list[0])
|
|
except TypeError:
|
|
token_str = ""
|
|
expires_list = token_query.get("Expires")
|
|
try:
|
|
expires_str = str(expires_list[0])
|
|
except TypeError:
|
|
expires_str = ""
|
|
if token_str != "None" and len(token_str) != 0:
|
|
expire_at = None
|
|
split = token_str.split("~")
|
|
for s in split:
|
|
try:
|
|
i = s.index("=")
|
|
except ValueError:
|
|
continue
|
|
if s[:i] == "exp":
|
|
expire_at = int(s[i + 1:])
|
|
break
|
|
if expire_at is None:
|
|
self.__expiration = -1
|
|
self.__cdn_manager.logger.warning(
|
|
"Invalid __token__ in CDN url: {}".format(url))
|
|
return
|
|
self.__expiration = expire_at * 1000
|
|
elif expires_str != "None" and len(expires_str) != 0:
|
|
expires_at = None
|
|
expires_str = expires_str.split("~")[0]
|
|
expires_at = int(expires_str)
|
|
if expires_at is None:
|
|
self.__expiration = -1
|
|
self.__cdn_manager.logger.warning("Invalid Expires param in CDN url: {}".format(url))
|
|
return
|
|
self.__expiration = expires_at * 1000
|
|
else:
|
|
try:
|
|
i = token_url.query.index("_")
|
|
except ValueError:
|
|
self.__expiration = -1
|
|
self.__cdn_manager.logger \
|
|
.warning("Couldn't extract expiration, invalid parameter in CDN url: {}".format(url))
|
|
return
|
|
self.__expiration = int(token_url.query[:i]) * 1000
|
|
|
|
else:
|
|
self.__expiration = -1
|
|
|
|
class Streamer(GeneralAudioStream, GeneralWritableStream):
|
|
available: typing.List[bool]
|
|
buffer: typing.List[bytes]
|
|
chunks: int
|
|
executor_service = concurrent.futures.ThreadPoolExecutor()
|
|
halt_listener: HaltListener
|
|
requested: typing.List[bool]
|
|
size: int
|
|
__audio_format: SuperAudioFormat
|
|
__audio_decrypt: AudioDecrypt
|
|
__cdn_url: CdnManager.CdnUrl
|
|
__internal_stream: InternalStream
|
|
__session: Session
|
|
__stream_id: StreamId
|
|
|
|
def __init__(self, session: Session, stream_id: StreamId,
|
|
audio_format: SuperAudioFormat,
|
|
cdn_url: CdnManager.CdnUrl, cache: CacheManager,
|
|
audio_decrypt: AudioDecrypt, halt_listener: HaltListener):
|
|
self.__session = session
|
|
self.__stream_id = stream_id
|
|
self.__audio_format = audio_format
|
|
self.__audio_decrypt = audio_decrypt
|
|
self.__cdn_url = cdn_url
|
|
self.halt_listener = halt_listener
|
|
response = self.request(range_start=0,
|
|
range_end=ChannelManager.chunk_size - 1)
|
|
content_range = response.headers.get("Content-Range")
|
|
if content_range is None:
|
|
raise IOError("Missing Content-Range header!")
|
|
split = content_range.split("/")
|
|
self.size = int(split[1])
|
|
self.chunks = int(math.ceil(self.size / ChannelManager.chunk_size))
|
|
first_chunk = response.buffer
|
|
self.available = [False for _ in range(self.chunks)]
|
|
self.requested = [False for _ in range(self.chunks)]
|
|
self.buffer = [b"" for _ in range(self.chunks)]
|
|
self.__internal_stream = CdnManager.Streamer.InternalStream(
|
|
self, False)
|
|
self.requested[0] = True
|
|
self.write_chunk(first_chunk, 0, False)
|
|
|
|
def write_chunk(self, chunk: bytes, chunk_index: int,
|
|
cached: bool) -> None:
|
|
if self.__internal_stream.is_closed():
|
|
return
|
|
self.__session.logger.debug(
|
|
"Chunk {}/{} completed, cached: {}, stream: {}".format(
|
|
chunk_index + 1, self.chunks, cached, self.describe()))
|
|
self.buffer[chunk_index] = self.__audio_decrypt.decrypt_chunk(
|
|
chunk_index, chunk)
|
|
self.__internal_stream.notify_chunk_available(chunk_index)
|
|
|
|
def stream(self) -> AbsChunkedInputStream:
|
|
return self.__internal_stream
|
|
|
|
def codec(self) -> SuperAudioFormat:
|
|
return self.__audio_format
|
|
|
|
def describe(self) -> str:
|
|
if self.__stream_id.is_episode():
|
|
return "episode_gid: {}".format(
|
|
self.__stream_id.get_episode_gid())
|
|
return "file_id: {}".format(self.__stream_id.get_file_id())
|
|
|
|
def decrypt_time_ms(self) -> int:
|
|
return self.__audio_decrypt.decrypt_time_ms()
|
|
|
|
def request_chunk(self, index: int) -> None:
|
|
response = self.request(index)
|
|
self.write_chunk(response.buffer, index, False)
|
|
|
|
def request(self, chunk: int = None, range_start: int = None, range_end: int = None)\
|
|
-> CdnManager.InternalResponse:
|
|
if chunk is None and range_start is None and range_end is None:
|
|
raise TypeError()
|
|
if chunk is not None:
|
|
range_start = ChannelManager.chunk_size * chunk
|
|
range_end = (chunk + 1) * ChannelManager.chunk_size - 1
|
|
response = self.__session.client().get(
|
|
self.__cdn_url.url,
|
|
headers={
|
|
"Range": "bytes={}-{}".format(range_start, range_end)
|
|
},
|
|
)
|
|
if response.status_code != 206:
|
|
raise IOError(response.status_code)
|
|
body = response.content
|
|
if body is None:
|
|
raise IOError("Response body is empty!")
|
|
return CdnManager.InternalResponse(body, dict(response.headers))
|
|
|
|
class InternalStream(AbsChunkedInputStream):
|
|
streamer: CdnManager.Streamer
|
|
|
|
def __init__(self, streamer, retry_on_chunk_error: bool):
|
|
self.streamer: CdnManager.Streamer = streamer
|
|
super().__init__(retry_on_chunk_error)
|
|
|
|
def buffer(self) -> typing.List[bytes]:
|
|
return self.streamer.buffer
|
|
|
|
def size(self) -> int:
|
|
return self.streamer.size
|
|
|
|
def close(self) -> None:
|
|
super().close()
|
|
del self.streamer.buffer
|
|
|
|
def requested_chunks(self) -> typing.List[bool]:
|
|
return self.streamer.requested
|
|
|
|
def available_chunks(self) -> typing.List[bool]:
|
|
return self.streamer.available
|
|
|
|
def chunks(self) -> int:
|
|
return self.streamer.chunks
|
|
|
|
def request_chunk_from_stream(self, index: int) -> None:
|
|
self.streamer.executor_service \
|
|
.submit(lambda: self.streamer.request_chunk(index))
|
|
|
|
def stream_read_halted(self, chunk: int, _time: int) -> None:
|
|
if self.streamer.halt_listener is not None:
|
|
self.streamer.executor_service\
|
|
.submit(lambda: self.streamer.halt_listener.stream_read_halted(chunk, _time))
|
|
|
|
def stream_read_resumed(self, chunk: int, _time: int) -> None:
|
|
if self.streamer.halt_listener is not None:
|
|
self.streamer.executor_service \
|
|
.submit(lambda: self.streamer.halt_listener.stream_read_resumed(chunk, _time))
|
|
|
|
|
|
class NormalizationData:
|
|
_LOGGER: logging = logging.getLogger(__name__)
|
|
track_gain_db: float
|
|
track_peak: float
|
|
album_gain_db: float
|
|
album_peak: float
|
|
|
|
def __init__(self, track_gain_db: float, track_peak: float,
|
|
album_gain_db: float, album_peak: float):
|
|
self.track_gain_db = track_gain_db
|
|
self.track_peak = track_peak
|
|
self.album_gain_db = album_gain_db
|
|
self.album_peak = album_peak
|
|
|
|
self._LOGGER.debug(
|
|
"Loaded normalization data, track_gain: {}, track_peak: {}, album_gain: {}, album_peak: {}"
|
|
.format(track_gain_db, track_peak, album_gain_db, album_peak))
|
|
|
|
@staticmethod
|
|
def read(input_stream: AbsChunkedInputStream) -> NormalizationData:
|
|
input_stream.seek(144)
|
|
data = input_stream.read(4 * 4)
|
|
input_stream.seek(0)
|
|
buffer = io.BytesIO(data)
|
|
return NormalizationData(
|
|
struct.unpack("<f", buffer.read(4))[0],
|
|
struct.unpack("<f", buffer.read(4))[0],
|
|
struct.unpack("<f", buffer.read(4))[0],
|
|
struct.unpack("<f", buffer.read(4))[0])
|
|
|
|
def get_factor(self, normalisation_pregain) -> float:
|
|
normalisation_factor = float(
|
|
math.pow(10, (self.track_gain_db + normalisation_pregain) / 20))
|
|
if normalisation_factor * self.track_peak > 1:
|
|
self._LOGGER \
|
|
.warning("Reducing normalisation factor to prevent clipping. Please add negative pregain to avoid.")
|
|
normalisation_factor = 1 / self.track_peak
|
|
return normalisation_factor
|
|
|
|
|
|
class PlayableContentFeeder:
|
|
logger = logging.getLogger("Librespot:PlayableContentFeeder")
|
|
storage_resolve_interactive = "/storage-resolve/files/audio/interactive/{}"
|
|
storage_resolve_interactive_prefetch = "/storage-resolve/files/audio/interactive_prefetch/{}"
|
|
__session: Session
|
|
|
|
def __init__(self, session: Session):
|
|
self.__session = session
|
|
|
|
def load(self, playable_id: PlayableId,
|
|
audio_quality_picker: AudioQualityPicker, preload: bool,
|
|
halt_listener: typing.Union[HaltListener, None]):
|
|
if type(playable_id) is TrackId:
|
|
return self.load_track(playable_id, audio_quality_picker, preload,
|
|
halt_listener)
|
|
if type(playable_id) is EpisodeId:
|
|
return self.load_episode(playable_id, audio_quality_picker,
|
|
preload, halt_listener)
|
|
raise TypeError("Unknown content: {}".format(playable_id))
|
|
|
|
def load_stream(self, file: Metadata.AudioFile, track: Metadata.Track,
|
|
episode: Metadata.Episode, preload: bool,
|
|
halt_lister: HaltListener):
|
|
if track is None and episode is None:
|
|
raise RuntimeError()
|
|
response = self.resolve_storage_interactive(file.file_id, preload)
|
|
if response.result == StorageResolve.StorageResolveResponse.Result.CDN:
|
|
if track is not None:
|
|
return CdnFeedHelper.load_track(self.__session, track, file,
|
|
response, preload, halt_lister)
|
|
return CdnFeedHelper.load_episode(self.__session, episode, file,
|
|
response, preload, halt_lister)
|
|
if response.result == StorageResolve.StorageResolveResponse.Result.STORAGE:
|
|
if track is None:
|
|
pass
|
|
elif response.result == StorageResolve.StorageResolveResponse.Result.RESTRICTED:
|
|
raise RuntimeError("Content is restricted!")
|
|
elif response.result == StorageResolve.StorageResolveResponse.Response.UNRECOGNIZED:
|
|
raise RuntimeError("Content is unrecognized!")
|
|
else:
|
|
raise RuntimeError("Unknown result: {}".format(response.result))
|
|
|
|
def load_episode(self, episode_id: EpisodeId,
|
|
audio_quality_picker: AudioQualityPicker, preload: bool,
|
|
halt_listener: HaltListener) -> LoadedStream:
|
|
episode = self.__session.api().get_metadata_4_episode(episode_id)
|
|
if episode.external_url:
|
|
return CdnFeedHelper.load_episode_external(self.__session, episode,
|
|
halt_listener)
|
|
file = audio_quality_picker.get_file(episode.audio)
|
|
if file is None:
|
|
self.logger.fatal(
|
|
"Couldn't find any suitable audio file, available: {}".format(
|
|
episode.audio))
|
|
return self.load_stream(file, None, episode, preload, halt_listener)
|
|
|
|
def load_track(self, track_id_or_track: typing.Union[TrackId,
|
|
Metadata.Track],
|
|
audio_quality_picker: AudioQualityPicker, preload: bool,
|
|
halt_listener: HaltListener):
|
|
if type(track_id_or_track) is TrackId:
|
|
original = self.__session.api().get_metadata_4_track(
|
|
track_id_or_track)
|
|
track = self.pick_alternative_if_necessary(original)
|
|
if track is None:
|
|
raise RuntimeError("Cannot get alternative track")
|
|
else:
|
|
track = track_id_or_track
|
|
file = audio_quality_picker.get_file(track.file)
|
|
if file is None:
|
|
self.logger.fatal(
|
|
"Couldn't find any suitable audio file, available: {}".format(
|
|
track.file))
|
|
raise FeederException()
|
|
return self.load_stream(file, track, None, preload, halt_listener)
|
|
|
|
def pick_alternative_if_necessary(
|
|
self, track: Metadata.Track) -> typing.Union[Metadata.Track, None]:
|
|
if len(track.file) > 0:
|
|
return track
|
|
for alt in track.alternative:
|
|
if len(alt.file) > 0:
|
|
return Metadata.Track(
|
|
gid=track.gid,
|
|
name=track.name,
|
|
album=track.album,
|
|
artist=track.artist,
|
|
number=track.number,
|
|
disc_number=track.disc_number,
|
|
duration=track.duration,
|
|
popularity=track.popularity,
|
|
explicit=track.explicit,
|
|
external_id=track.external_id,
|
|
restriction=track.restriction,
|
|
file=alt.file,
|
|
sale_period=track.sale_period,
|
|
preview=track.preview,
|
|
tags=track.tags,
|
|
earliest_live_timestamp=track.earliest_live_timestamp,
|
|
has_lyrics=track.has_lyrics,
|
|
availability=track.availability,
|
|
licensor=track.licensor)
|
|
return None
|
|
|
|
def resolve_storage_interactive(
|
|
self, file_id: bytes,
|
|
preload: bool) -> StorageResolve.StorageResolveResponse:
|
|
resp = self.__session.api().send(
|
|
"GET",
|
|
(self.storage_resolve_interactive_prefetch
|
|
if preload else self.storage_resolve_interactive).format(
|
|
util.bytes_to_hex(file_id)),
|
|
None,
|
|
None,
|
|
)
|
|
if resp.status_code != 200:
|
|
raise RuntimeError(resp.status_code)
|
|
body = resp.content
|
|
if body is None:
|
|
raise RuntimeError("Response body is empty!")
|
|
storage_resolve_response = StorageResolve.StorageResolveResponse()
|
|
storage_resolve_response.ParseFromString(body)
|
|
return storage_resolve_response
|
|
|
|
class LoadedStream:
|
|
episode: Metadata.Episode
|
|
track: Metadata.Track
|
|
input_stream: GeneralAudioStream
|
|
normalization_data: NormalizationData
|
|
metrics: PlayableContentFeeder.Metrics
|
|
|
|
def __init__(self, track_or_episode: typing.Union[Metadata.Track,
|
|
Metadata.Episode],
|
|
input_stream: GeneralAudioStream,
|
|
normalization_data: typing.Union[NormalizationData, None],
|
|
metrics: PlayableContentFeeder.Metrics):
|
|
if type(track_or_episode) is Metadata.Track:
|
|
self.track = track_or_episode
|
|
self.episode = None
|
|
elif type(track_or_episode) is Metadata.Episode:
|
|
self.track = None
|
|
self.episode = track_or_episode
|
|
else:
|
|
raise TypeError()
|
|
self.input_stream = input_stream
|
|
self.normalization_data = normalization_data
|
|
self.metrics = metrics
|
|
|
|
class Metrics:
|
|
file_id: str
|
|
preloaded_audio_key: bool
|
|
audio_key_time: int
|
|
|
|
def __init__(self, file_id: typing.Union[bytes, None],
|
|
preloaded_audio_key: bool, audio_key_time: int):
|
|
self.file_id = None if file_id is None else util.bytes_to_hex(
|
|
file_id)
|
|
self.preloaded_audio_key = preloaded_audio_key
|
|
self.audio_key_time = audio_key_time
|
|
if preloaded_audio_key and audio_key_time != -1:
|
|
raise RuntimeError()
|
|
|
|
|
|
class StreamId:
|
|
file_id: bytes
|
|
episode_gid: bytes
|
|
|
|
def __init__(self,
|
|
file: Metadata.AudioFile = None,
|
|
episode: Metadata.Episode = None):
|
|
if file is None and episode is None:
|
|
return
|
|
self.file_id = None if file is None else file.file_id
|
|
self.episode_gid = None if episode is None else episode.gid
|
|
|
|
def get_file_id(self):
|
|
if self.file_id is None:
|
|
raise RuntimeError("Not a file!")
|
|
return util.bytes_to_hex(self.file_id)
|
|
|
|
def is_episode(self):
|
|
return self.episode_gid is not None
|
|
|
|
def get_episode_gid(self):
|
|
if self.episode_gid is None:
|
|
raise RuntimeError("Not an episode!")
|
|
return util.bytes_to_hex(self.episode_gid)
|