About Streaming Audio Files

Streaming audio files allows you to have quicker Time to First Byte (TTFB) and doesn't require downloading the entire file to start playing the track from the specified position. You can stream audio files using the StreamingHttpResponse responses with a file iterator, as follows:

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import re
import os
from wsgiref.util import FileWrapper
from django.http import StreamingHttpResponse
from django.conf import settings

RANGE_RE = re.compile(r"bytes\s*=\s*(\d+)\s*-\s*(\d*)", re.I)

def file_iterator(file_path, chunk_size=8192, offset=0, length=None):
    with open(file_path, "rb") as f:
        f.seek(offset, os.SEEK_SET)
        remaining = length
        while True:
            bytes_length = (
                chunk_size
                if remaining is None 
                else min(remaining, chunk_size)
            )
            data = f.read(bytes_length)
            if not data:
                break
            if remaining:
                remaining -= len(data)
            yield data

def stream_audio(request):
    path = str(settings.BASE_DIR / "data" / "music.mp3")
    content_type = "audio/mp3"

    range_header = request.META.get("HTTP_RANGE", "").strip()
    range_match = RANGE_RE.match(range_header)
    size = os.path.getsize(path)

    if range_match:
        first_byte, last_byte = range_match.groups()
        first_byte = int(first_byte) if first_byte else 0
        last_byte = (
            first_byte + 1024 * 1024 * 8
        )  # The max volume of the response body is 8M per piece
        if last_byte >= size:
            last_byte = size - 1
        length = last_byte - first_byte + 1
        response = StreamingHttpResponse(
            file_iterator(path, offset=first_byte, length=length),
            status=206,
            content_type=content_type,
        )
        response["Content-Range"] = f"bytes {first_byte}-{last_byte}/{size}"

    else:
        response = StreamingHttpResponse(
            FileWrapper(open(path, "rb")), content_type=content_type
        )
    response["Accept-Ranges"] = "bytes"
    return response

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