Alicia Boya García ntrrgc

## simulate_unwind.py
"""
Small simulator of a simplified CPU for the purposes of testing frame pointer
ABIs for ARM32.
"""

from __future__ import annotations
from abc import ABC, abstractmethod
from bisect import bisect_right
from dataclasses import dataclass, field
from enum import StrEnum

## ref_scipy.py
import timeit
import scipy.io.wavfile

t0 = timeit.default_timer()
_, samples = scipy.io.wavfile.read("test.wav")
for channel_ix, max_sample in enumerate(samples.max(axis=0)):
    print(f"Channel {channel_ix} max: 0x{max_sample:x}")
t1 = timeit.default_timer()

print(f"Elapsed {(t1-t0)*1000:.3f}ms")

## ffmpeg_sbr.md

      
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              October 27, 2025 01:56
            
              
                How ffmpeg detects SBR in AAC files
              
          
    How ffmpeg detects SBR in AAC files
First frame decoding and configuration

static int decode_frame_ga(AVCodecContext *avctx, AACDecContext *ac,
                           GetBitContext *gb, int *got_frame_ptr)
{
    // ... parse frame ...

  
## mp4box_mpd_to_webkit_manifest.py
#!/usr/bin/env python3
"""
mp4box_mpd_to_webkit_manifest.py:

Small utility to convert a DASH MPD file coming from MP4Box into a much simpler
JSON manifest as used in WebKit LayoutTests.

---

MIT License

## simple-media-player.html
<!DOCTYPE html>
<!--
Simple page with an HTMLMediaElement, event log and basic controls.
You can use this as a template to explore the behavior of HTMLMediaElement and
look for media playback bugs in web engines.
-->
<html>
<head>
    <title>Simple media player</title>
    <meta charset="utf-8">

## multidict.py
from collections.abc import ItemsView, Set, KeysView
from typing import Iterable, Iterator, NamedTuple, Hashable

class MultiDict[K: Hashable, V: Hashable]:
    """
    Associates sets of values with a key.
    Values can repeat for different keys if needed.
    """
    def __init__(self):
        self.__vals_by_key: dict[K, set[V]] = {}

## get-terminal-background-color.py
#!/usr/bin/env python3
import os, termios, collections, re

TermAttr = collections.namedtuple("TermAttr",
    ["iflag", "oflag", "cflag", "lflag", "ispeed", "ospeed", "cc"])

old = TermAttr._make(termios.tcgetattr(0))
new = old._replace(
    lflag=old.lflag & ~(termios.ECHO | termios.ICANON)
)

## mp4parser.py
#!/usr/bin/env python3
'''
Code by Alba Mendez, manually copied and pasted, had 8 revisions when copied.
https://gist.github.com/mildsunrise/ffd74730504e4dc44f47fc7528e7bf59

Portable* ISO Base Media File Format dissector / parser.
Usage: ./mp4parser.py <file name>

(*) Needs Python 3.8+

## register_path.sh
register_path() {
    # Usage:
    #   register_path <env_var_name> <provided_path> [after]
    #
    # Registers a path in a PATH-like environment variable.
    # The provided_path is prepended unless the "after"
    # argument is provided, in which case it's appended.
    #
    # Example:
    #   register_path LD_LIBRARY_PATH /an/important/path

## plot-wpt-compat.py
#!/usr/bin/python3
# Instructions:
# 1. Checkout: https://github.com/Ecosystem-Infra/wpt-results-analysis.git
# 2. cd compat-2021
# 3. Edit main.js like this:
# const CATEGORIES = [
# +  'media-source',
# +  'media',
# ];
# ...
	"""
	Small simulator of a simplified CPU for the purposes of testing frame pointer
	ABIs for ARM32.
	"""

	from __future__ import annotations
	from abc import ABC, abstractmethod
	from bisect import bisect_right
	from dataclasses import dataclass, field
	from enum import StrEnum
	import timeit
	import scipy.io.wavfile

	t0 = timeit.default_timer()
	_, samples = scipy.io.wavfile.read("test.wav")
	for channel_ix, max_sample in enumerate(samples.max(axis=0)):
	print(f"Channel {channel_ix} max: 0x{max_sample:x}")
	t1 = timeit.default_timer()

	print(f"Elapsed {(t1-t0)*1000:.3f}ms")
	#!/usr/bin/env python3
	"""
	mp4box_mpd_to_webkit_manifest.py:

	Small utility to convert a DASH MPD file coming from MP4Box into a much simpler
	JSON manifest as used in WebKit LayoutTests.

	---

	MIT License
	<!DOCTYPE html>
	<!--
	Simple page with an HTMLMediaElement, event log and basic controls.
	You can use this as a template to explore the behavior of HTMLMediaElement and
	look for media playback bugs in web engines.
	-->
	<html>
	<head>
	<title>Simple media player</title>
	<meta charset="utf-8">
	from collections.abc import ItemsView, Set, KeysView
	from typing import Iterable, Iterator, NamedTuple, Hashable

	class MultiDict[K: Hashable, V: Hashable]:
	"""
	Associates sets of values with a key.
	Values can repeat for different keys if needed.
	"""
	def __init__(self):
	self.__vals_by_key: dict[K, set[V]] = {}
	#!/usr/bin/env python3
	import os, termios, collections, re

	TermAttr = collections.namedtuple("TermAttr",
	["iflag", "oflag", "cflag", "lflag", "ispeed", "ospeed", "cc"])

	old = TermAttr._make(termios.tcgetattr(0))
	new = old._replace(
	lflag=old.lflag & ~(termios.ECHO \| termios.ICANON)
	)
	#!/usr/bin/env python3
	'''
	Code by Alba Mendez, manually copied and pasted, had 8 revisions when copied.
	https://gist.github.com/mildsunrise/ffd74730504e4dc44f47fc7528e7bf59

	Portable* ISO Base Media File Format dissector / parser.
	Usage: ./mp4parser.py <file name>

	(*) Needs Python 3.8+
	register_path() {
	# Usage:
	# register_path <env_var_name> <provided_path> [after]
	#
	# Registers a path in a PATH-like environment variable.
	# The provided_path is prepended unless the "after"
	# argument is provided, in which case it's appended.
	#
	# Example:
	# register_path LD_LIBRARY_PATH /an/important/path
	#!/usr/bin/python3
	# Instructions:
	# 1. Checkout: https://github.com/Ecosystem-Infra/wpt-results-analysis.git
	# 2. cd compat-2021
	# 3. Edit main.js like this:
	# const CATEGORIES = [
	# + 'media-source',
	# + 'media',
	# ];
	# ...