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# Pyrogram - Telegram MTProto API Client Library for Python

# This file is part of Pyrogram.

# Pyrogram is free software: you can redistribute it and/or modify

# it under the terms of the GNU Lesser General Public License as published

# by the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# Pyrogram is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public License

# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.

import math

from typing import Union, Optional, BinaryIO

import pyrogram

from pyrogram import types

from pyrogram.file_id import FileId

class StreamMedia:

async def stream_media(

self: "pyrogram.Client",

message: Union["types.Message", str],

limit: int = 0,

offset: int = 0

) -> Optional[Union[str, BinaryIO]]:

"""Stream the media from a message chunk by chunk.

You can use this method to partially download a file into memory or to selectively download chunks of file.

The chunk maximum size is 1 MiB (1024 * 1024 bytes).

.. include:: /_includes/usable-by/users-bots.rst

Parameters:

message (:obj:`~pyrogram.types.Message` | ``str``):

Pass a Message containing the media, the media itself (message.audio, message.video, ...) or a file id

as string.

limit (``int``, *optional*):

Limit the amount of chunks to stream.

Defaults to 0 (stream the whole media).

offset (``int``, *optional*):

How many chunks to skip before starting to stream.

Defaults to 0 (start from the beginning).

Returns:

``Generator``: A generator yielding bytes chunk by chunk

Example:

.. code-block:: python

# Stream the whole media

async for chunk in app.stream_media(message):

print(len(chunk))

# Stream the first 3 chunks only

async for chunk in app.stream_media(message, limit=3):

print(len(chunk))

# Stream the rest of the media by skipping the first 3 chunks

async for chunk in app.stream_media(message, offset=3):

print(len(chunk))

# Stream the last 3 chunks only (negative offset)

async for chunk in app.stream_media(message, offset=-3):

print(len(chunk))

"""

available_media = ("audio", "document", "photo", "sticker", "animation", "video", "voice", "video_note",

"new_chat_photo")

if isinstance(message, types.Message):

for kind in available_media:

media = getattr(message, kind, None)

if media is not None:

break

else:

raise ValueError("This message doesn't contain any downloadable media")

else:

media = message

if isinstance(media, str):

file_id_str = media

else:

file_id_str = media.file_id

file_id_obj = FileId.decode(file_id_str)

file_size = getattr(media, "file_size", 0)

if offset < 0:

if file_size == 0:

raise ValueError("Negative offsets are not supported for file ids, pass a Message object instead")

chunks = math.ceil(file_size / 1024 / 1024)

offset += chunks

async for chunk in self.get_file(file_id_obj, file_size, limit, offset):

yield chunk

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