Complete VIDEO-001 through VIDEO-004 software video studies
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LittleSam129
289
tools/video002_simulation.py
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289
tools/video002_simulation.py
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"""VIDEO-002: воспроизводимый файловый прогон H.264 через фрагменты и потери."""
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from __future__ import annotations
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import argparse
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from fractions import Fraction
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import hashlib
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import json
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import math
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from pathlib import Path
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import random
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import av
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from protocol.video_stream_transport import (
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BoundedFrameQueue, FrameReassembler, FrameType, VideoFrame,
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encode_fragment,
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)
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from tools.video002_radio_budget import estimate, matrix, margin_fits
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from tools.video_compare import new_h264_encoder, source_frames
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ROOT = Path(__file__).resolve().parents[1]
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SOURCE = ROOT / "data/raw/video001/udacity_project_video.mp4"
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RESULT_160 = ROOT / "data/processed/video001/comparison_traffic_160k.json"
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RESULT_320 = ROOT / "data/processed/video001/comparison_traffic_320k.json"
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DEFAULT_OUTPUT = ROOT / "data/processed/video002/results.json"
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SEED = 20260916
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SCENARIOS = tuple([("random", value) for value in (0, 1, 2, 5, 10, 20)]
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+ [("burst", value) for value in (2, 5, 10)]
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+ [("keyframe", 1), ("delta", 1)])
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MODES = (("ROBUST", 320, 240, 5, 160_000),
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("NORMAL", 640, 360, 10, 320_000),
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("HIGH_QUALITY", 854, 480, 10, 320_000))
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BUDGET_ONLY_MODES = (("640x480_10FPS", 640, 480, 10, 320_000),
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("1280x720_5FPS", 1280, 720, 5, 320_000))
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LINKS = (("CURRENT_BPSK_256_GAP5", "BPSK", 500_000, 256, 5),
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("CALCULATED_QPSK_1024_GAP0", "QPSK", 500_000, 1024, 0),
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("SOFTWARE_2MBPS", None, 2_000_000, 1024, 0))
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def _result_case(results: dict, window: str, width: int, height: int,
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fps: int) -> dict:
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matches = [case for case in results["cases"]
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if case["window"] == window and case["resolution"] == [width, height]
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and case["fps"] == fps and case["codec"] == "H264_LIBX264"]
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if len(matches) != 1:
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raise ValueError("Не найдена единственная исходная серия VIDEO-001")
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return matches[0]
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def load_real_stream(source: Path, window: dict, width: int, height: int,
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fps: int, maxrate_bps: int, expected_sizes: list[int]) -> list[VideoFrame]:
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"""Повторить кодирование VIDEO-001 и сверить каждый размер с исходным JSON."""
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frames = source_frames(source, width, height, fps,
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window["start_seconds"], window["duration_seconds"])
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encoder, _ = new_h264_encoder(width, height, fps, maxrate_bps)
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encoded: list[VideoFrame] = []
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for index, pixels in enumerate(frames):
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frame = av.VideoFrame.from_ndarray(pixels, format="rgb24").reformat(format="yuv420p")
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frame.pts = index
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packets = encoder.encode(frame)
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if len(packets) != 1:
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raise ValueError("Кодировщик не дал один пакет на кадр")
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packet = packets[0]
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encoded.append(VideoFrame(0x56303032, index,
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FrameType.KEYFRAME if packet.is_keyframe
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else FrameType.DELTA_FRAME,
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round(index * 1000 / fps), bytes(packet)))
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if encoder.encode(None):
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raise ValueError("Неожиданные отложенные пакеты кодировщика")
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actual_sizes = [len(frame.data) for frame in encoded]
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if actual_sizes != expected_sizes:
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raise ValueError("Поток не совпал с VIDEO-001 по размерам кадров")
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return encoded
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def _drop(kind: str, level: int, packet_index: int, frame_id: int,
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fragment_index: int, fps: int, random_generator: random.Random,
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burst_start: int | None) -> bool:
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if kind == "random":
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return random_generator.random() < level / 100
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if kind == "burst":
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return burst_start is not None and burst_start <= packet_index < burst_start + level
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target_id = fps if kind == "keyframe" else fps + 1
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return frame_id == target_id and fragment_index == 0
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def simulate(frames: list[VideoFrame], fps: int, link: tuple,
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scenario: tuple[str, int], seed: int = SEED,
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max_age_ms: int = 300,
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airtime_override_ms: float | None = None) -> dict:
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"""Дискретные моменты захвата и завершения пакетов, затем настоящий H.264 decode."""
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link_name, modulation, speed, payload, gap = link
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kind, level = scenario
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if airtime_override_ms is not None:
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if not math.isfinite(airtime_override_ms) or airtime_override_ms <= 0:
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raise ValueError("эфирное время должно быть положительным")
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airtime_ms = airtime_override_ms
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elif modulation:
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airtime_ms = estimate(modulation, speed, payload, gap).airtime_ms
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else:
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# Контрольная программная линия: 2 Мбит/с полезной PHY-нагрузки без RF.
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airtime_ms = payload * 8000 / speed
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queue = BoundedFrameQueue(payload, max_frames=2, max_age_ms=max_age_ms)
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reassembler = FrameReassembler(frames[0].stream_id, payload,
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max_pending_frames=2, max_age_ms=max_age_ms)
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decoder = av.CodecContext.create("h264", "r")
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decoder.open()
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random_generator = random.Random(seed)
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next_arrival = 0
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next_ready = 0.0
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packet_index = 0
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burst_start: int | None = None
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lost_packets = 0
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lost_frame_ids: set[int] = set()
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displayed: list[tuple[int, float, str]] = []
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decoder_errors = 0
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synchronized = False
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last_displayed_id: int | None = None
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until_ms = frames[-1].capture_ms + max_age_ms
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while next_arrival < len(frames) or queue.depth:
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arrival_ms = (frames[next_arrival].capture_ms
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if next_arrival < len(frames) else math.inf)
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if arrival_ms <= next_ready or not queue.depth:
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if next_arrival >= len(frames):
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break
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queue.enqueue(frames[next_arrival], arrival_ms)
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next_ready = max(next_ready, float(arrival_ms))
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next_arrival += 1
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continue
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start_ms = next_ready
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end_ms = start_ms + airtime_ms
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fragment = queue.next_fragment(math.floor(start_ms), end_ms)
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if fragment is None:
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continue
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wire = encode_fragment(fragment, payload)
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if kind == "burst" and burst_start is None:
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burst_start = packet_index
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packet_lost = _drop(kind, level, packet_index, fragment.frame_id,
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fragment.fragment_index, fps, random_generator,
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burst_start)
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queue.mark_sent()
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packet_index += 1
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next_ready = end_ms + gap
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if packet_lost:
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lost_packets += 1
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lost_frame_ids.add(fragment.frame_id)
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continue
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complete = reassembler.offer(wire, math.ceil(end_ms))
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if complete is None:
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continue
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if complete.frame_type == FrameType.KEYFRAME:
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decoder = av.CodecContext.create("h264", "r")
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decoder.open()
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synchronized = True
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elif last_displayed_id is None or complete.frame_id != last_displayed_id + 1:
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synchronized = False
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if not synchronized:
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continue
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encoded_packet = av.Packet(complete.data)
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encoded_packet.pts = encoded_packet.dts = complete.frame_id
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encoded_packet.time_base = Fraction(1, fps)
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try:
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decoded = decoder.decode(encoded_packet)
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except av.error.FFmpegError:
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decoder_errors += 1
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synchronized = False
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continue
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if len(decoded) != 1 or int(decoded[0].pts) != complete.frame_id:
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decoder_errors += 1
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synchronized = False
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continue
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digest = hashlib.sha256(decoded[0].to_ndarray(format="rgb24").tobytes()).hexdigest()
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if last_displayed_id is not None and complete.frame_id <= last_displayed_id:
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raise AssertionError("Повторный показ старого кадра")
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displayed.append((complete.frame_id, end_ms - frames[complete.frame_id].capture_ms,
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digest))
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last_displayed_id = complete.frame_id
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reassembler.expire(math.ceil(until_ms + 1))
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displayed_ids = {item[0] for item in displayed}
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if len(displayed_ids) != len(displayed):
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raise AssertionError("Повторный номер показанного кадра")
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lost_ids = sorted(lost_frame_ids)
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recovery_ms = None
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recovered_keyframe = None
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if lost_ids:
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first_lost = lost_ids[0]
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next_keys = [frame_id for frame_id, age, _ in displayed
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if frame_id > first_lost
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and frames[frame_id].frame_type == FrameType.KEYFRAME]
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if next_keys:
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recovered_keyframe = next_keys[0]
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shown = next(item for item in displayed if item[0] == recovered_keyframe)
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recovery_ms = shown[1] + frames[recovered_keyframe].capture_ms - frames[first_lost].capture_ms
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ages = [item[1] for item in displayed]
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p95_age = (sorted(ages)[math.ceil(0.95 * len(ages)) - 1]
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if ages else None)
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return {
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"link": link_name, "scenario": kind, "level": level, "seed": seed,
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"input_frames": len(frames), "packet_attempts": packet_index,
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"lost_packets": lost_packets, "affected_frames": len(lost_frame_ids),
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"displayed_frames": len(displayed),
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"displayed_fps": len(displayed) / (len(frames) / fps),
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"frame_loss_fraction": 1 - len(displayed) / len(frames),
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"displayed_frame_ids": [item[0] for item in displayed],
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"keyframe_sha256_by_id": {
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str(frame_id): digest for frame_id, _, digest in displayed
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if frames[frame_id].frame_type == FrameType.KEYFRAME},
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"unique_decoded_images": len({item[2] for item in displayed}),
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"no_old_frame_replay": len(displayed_ids) == len(displayed),
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"mean_end_to_end_age_ms": sum(ages) / len(ages) if ages else None,
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"p95_end_to_end_age_ms": p95_age,
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"max_end_to_end_age_ms": max(ages) if ages else None,
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"recovery_ms_after_first_lost_fragment": recovery_ms,
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"recovered_keyframe_id": recovered_keyframe,
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"max_queue_depth": queue.max_depth,
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"max_oldest_frame_age_ms": queue.max_oldest_age_ms,
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"dropped_stale_frames": queue.stale_frame_drops,
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"dropped_capacity_frames": queue.capacity_frame_drops,
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"incomplete_expired_frames": reassembler.expired_frames,
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"decoder_errors": decoder_errors,
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}
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def run(source: Path = SOURCE) -> dict:
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source_digest = hashlib.sha256(source.read_bytes()).hexdigest()
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results_160 = json.loads(RESULT_160.read_text(encoding="utf-8"))
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results_320 = json.loads(RESULT_320.read_text(encoding="utf-8"))
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if source_digest != results_160["source_sha256"] or source_digest != results_320["source_sha256"]:
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raise ValueError("SHA-256 ролика не совпадает с VIDEO-001")
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cases = []
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for mode, width, height, fps, maxrate in MODES:
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source_results = results_160 if maxrate == 160_000 else results_320
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for window in source_results["windows"]:
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original = _result_case(source_results, window["name"], width, height, fps)
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frames = load_real_stream(source, window, width, height, fps, maxrate,
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original["frame_sizes_bytes"])
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window_cases = []
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for link in LINKS:
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for scenario in SCENARIOS:
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measured = simulate(frames, fps, link, scenario)
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measured.update({"mode": mode, "window": window["name"],
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"resolution": [width, height], "fps": fps,
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"original_average_bitrate_bps": original["average_bitrate_bps"],
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"original_peak_bitrate_bps": original["peak_one_second_bitrate_bps"]})
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window_cases.append(measured)
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reference = next(item for item in window_cases
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if item["link"] == "SOFTWARE_2MBPS"
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and item["scenario"] == "random" and item["level"] == 0)
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for item in window_cases:
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for frame_id, digest in item["keyframe_sha256_by_id"].items():
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if digest != reference["keyframe_sha256_by_id"][frame_id]:
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raise AssertionError("Опорный кадр после потери отличается от чистого декодирования")
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cases.extend(window_cases)
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peaks = {mode: max(_result_case(results_160 if rate == 160_000 else results_320,
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window["name"], width, height, fps)["peak_one_second_bitrate_bps"]
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for window in results_320["windows"])
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for mode, width, height, fps, rate in MODES + BUDGET_ONLY_MODES}
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budgets = []
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for row in matrix():
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item = row.as_dict()
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item["fits_peak_with_20pct_margin"] = {
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name: margin_fits(row.useful_video_bps, peak, 0.2)
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for name, peak in peaks.items()}
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item["fits_peak_with_50pct_margin"] = {
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name: margin_fits(row.useful_video_bps, peak, 0.5)
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for name, peak in peaks.items()}
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budgets.append(item)
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return {"source_sha256": source_digest, "seed": SEED,
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"max_age_ms": 300, "sender_queue_frames": 2,
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"receiver_pending_frames": 2, "peak_bitrate_bps": peaks,
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"radio_estimates": budgets, "simulations": cases,
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"rf_tx": 0}
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def main() -> None:
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument("--source", type=Path, default=SOURCE)
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parser.add_argument("--output", type=Path, default=DEFAULT_OUTPUT)
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args = parser.parse_args()
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result = run(args.source)
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args.output.parent.mkdir(parents=True, exist_ok=True)
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args.output.write_text(json.dumps(result, ensure_ascii=False, indent=2), encoding="utf-8")
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print(f"VIDEO-002: {len(result['simulations'])} прогонов; {args.output}")
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if __name__ == "__main__":
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main()
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