283 lines
18 KiB
Markdown
283 lines
18 KiB
Markdown
# Technical Specification: Advanced Editing Toolset & Graph-Based Continuous Waveform Painting on Sub-Tab
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This document defines the interactive layout design, the configuration of the toolbar button arrays, and the signal processing routines for compiling a Graph-based Continuous Waveform graph optimized for the microscopic viewports inside the isolated temporary document workspace (Sub-tab), referencing the structural paradigms of `image_5ec2e5.png` and `image_5ec363.png`.
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---
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## 1. Target Selection Scope
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The toolset within the Sub-tab environment supports two target operational boundaries:
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* **Global Clip:** When no specific timeline selection highlighted mask is present, all active DSP effects apply uniformly across the entire length of the extracted Audio Clip.
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* **Selected Range:** When an explicit timeline segment $[T_{\text{start}}, T_{\text{end}}]$ is highlighted by the user, DSP routines calculate changes exclusively inside those boundaries. Splice junctions automatically compute crossfades to mitigate transient click/pop anomalies.
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---
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## 2. Ruler-Based Tools
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These utilities display as intuitive, linear slider scales (Sliders/Rulers) embedded in the top toolbar row:
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```text
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[ Normalize: |======o======| 0 dB ] [ Gain: |====o====| +3 dB ] [ Pitch: |==o==| -2 Semi ]
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```
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### 2.1. Peak Normalization
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* **UI Layout:** A slide scale control allowing users to configure target amplitude thresholds variable from $-12\text{ dBFS}$ down to $0\text{ dBFS}$.
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* **DSP Math Algorithm:** Locate the maximum absolute peak amplitude value $A_{\text{max}}$ within the targeted area, then multiply all active samples by a static scalar gain multiplier $G$:
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$$G = \frac{10^{\frac{\text{Target\_dB}}{20}}}{A_{\text{max}}}$$
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### 2.2. Volume Up / Down (Quick Gain)
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* **UI Layout:** A linear sliding ruler modulating the overall absolute gain structure of the focused segment.
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* **Operational Range:** Adjustable from $-\infty\text{ dB}$ (complete mute attenuation) up to $+12\text{ dB}$ of linear amplification.
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### 2.3. Pitch Shifting
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* **UI Layout:** A calibrated slider modifying the project's fundamental frequencies discrete in semitones or cents.
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* **Operational Range:** Boundaries map from $-12\text{ semitones}$ (one octave down) to $+12\text{ semitones}$ (one octave up).
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* **DSP Engine Routine:** Employs a spectral Phase Vocoder to shift frequencies without affecting the physical, real-time duration layout of the segment.
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---
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## 3. Graph-Based Fades
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Fading curves overlay graphically directly onto the highlighted waveform canvas region, enabling precise boundary amplitude adjustments:
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```text
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Linear Fade-In Exponential Fade-Out
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+───────────────────────────+ +───────────────────────────+
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| /███████████████| |███████████\ |
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| / ███████████████| |███████████ \ |
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| / ███████████████| |███████████ \___ |
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| / ███████████████| |███████████ \______|
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+───────────────────────────+ +───────────────────────────+
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|<──────── Fade-In ────────>| |<─────── Fade-Out ────────>|
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```
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* **Fade-In:** Multiplies an ascending amplitude ramp from $0.0$ to $1.0$ at the starting index profile of the selection region. Users can toggle seamlessly between **Linear** or **Exponential** curves to achieve a smoother, more psychoacoustically natural volume build-up.
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* **Fade-Out:** Multiplies a descending amplitude decay ramp from $1.0$ down to $0.0$ at the trailing boundary edge of the selection range.
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---
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## 4. Ruler Percentage Stretch Tool
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A dedicated percentage metric scale control (`Ruler %`) sitting on the control toolbar dictates time-stretching and playback velocity parameters:
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```text
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[ Speed Stretch %: |========o========| 100% (Native) ] -> Range: 50% - 200%
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```
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* **Interaction Mapping:** Users drag the percentage slider node or hold down the `Alt` key and drag the rightmost boundary edge of the clip along the horizontal axis to change this scale metric.
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* **Sync Formula:** Let $D$ map to the unscaled native duration value, and $D'$ map to the target modified duration footprint. The resulting structural playback speed ratio percentage ($S$) is given by:
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$$S = \frac{D}{D'} \times 100\%$$
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---
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## 5. Continuous Graph-Based Waveform Painting & Microscopic Viewports
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The waveform graph inside the Sub-tab is compiled as a unified, continuous line vector (Continuous Line Graph) that flows seamlessly along the timeline axis, mapping the literal physical phase displacements of the underlying audio signal.
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### 5.1. Logarithmic Amplitude Axis Grid Layout
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Following the professional paradigm established in `image_5ec2e5.png`, the waveform painting canvas is divided by a symmetrical layout grid reflecting both positive and negative polarity limits of the central horizontal axis:
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```text
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+6.0 dB ───────────────────────────────────────────────────────────────────
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~ ~ ~ ~ ~ ~ ~ ~ (Sub-division Grid Line) ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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-6.0 dB ───────────────────────────────────────────────────────────────────
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\ / \ / \
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-Inf dB ─○───────────/───────────────○───────────/───────────────○───────── (Zero-Line Axis)
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\ / \ / \
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-6.0 dB ───────────────────────────────────────────────────────────────────
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+6.0 dB ───────────────────────────────────────────────────────────────────
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```
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* **Visual Bounding Thresholds:**
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* **Central Zero Axis (-Inf. dB):** Maps the absolute baseline $0\text{V}$ electrical reference (complete absence of audio signal / absolute silence).
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* **Symmetrical Decibel Grids:** Project accurate scale metrics tracking normalized peak levels (the inner $-6.0\text{ dB}$ sub-grid marks a $50.1\%$ amplitude ceiling, while the outermost physical frame boundary aligns to $+6.0\text{ dB}$ or $0\text{ dBFS}$).
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### 5.2. Standard Workspace View vs. Ultra Zoom Viewport Scaling
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The drawing engine dynamically hot-swaps its rendering calculations (Rendering Routine) depending on the active pixel compression metric $Z$ (pixels/second):
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* **Standard View Mode ($Z < 500\text{ pixels/second}$):** The system deploys a structural peak compression layout algorithm (**Peak Waveform**—as referenced in `image_5ec2e5.png`). It connects the maximum absolute upper peak bounding indices (Max) with the lower minimum value ranges (Min) passing through a common pixel column into a unified vector line, generating an organic, aliases-free continuous waveform silhouette.
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* **Micro Viewport Zoom-In ($Z \ge 500\text{ pixels/second}$—as referenced in `image_5ec363.png`):** Once viewport stretching scales past this threshold, the framework transitions into a **Single Continuous Sine Polyline** loop. Chronologically sequential acoustic sample addresses ($x[i]$, $x[i+1]$) map as discrete vector coordinate indices bound together by thin lines (using sharp smooth polyline vectors or linear/cubic spline interpolation loops), charting pristine, individual sinusoidal phases explicitly.
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### 5.3. Zero-Crossing Alignment within Ultra Zoom Viewports
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When performing rapid cursor tracking edits (Scrub/Drag Selection), the alignment routine locks the selection boundary marker coordinates onto the nearest baseline sample offset exhibiting a complete algebraic phase conversion (sign inversion):
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$$x[i] \cdot x[i+1] \le 0$$
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---
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## 6. Top Duration Timeline
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Directly above the isolated sub-tab waveform canvas lane, a dedicated horizontal measuring ruler tracks clip timing data:
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```text
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| 0:00.000 | 0:01.000 | 0:02.000 | 0:03.000 | 0:04.000 (Duration: 4.152s)
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+───────────────────────────────────────────────────────────────────────────────────────+
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| [==================== VÙNG QUÉT CHỌN (RANGE SELECTION) ====================] |
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+───────────────────────────────────────────────────────────────────────────────────────+
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```
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* **Total Duration Monitoring:** Renders the absolute, precise time extent of the isolated audio block in the right-hand corner of the timeline ruler layout (e.g., `Duration: 12.450s`).
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* **Duration Selection Drag:** Left-clicking and dragging horizontally inside this top duration bar defines a highlighted selection overlay window. This range indicator automatically projects down into the waveform lane underneath.
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---
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## 7. Bottom Transport Panel & Master Tools
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A comprehensive control framework containing expanded navigation buttons and deep session processing controls anchors the bottom row of the sub-tab environment, matching the layout structure in `image_5ec2e5.png`:
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```text
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+─────────────────────────────────────────────────────────────────────────────────────────────+
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| [● Rec] [◀◀ Back] [▶ Play] [|| Pause] [■ Stop] | Rate: |====o====| 0.00 | Loop: [X] |
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|---------------------------------------------------------------------------------------------|
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| [Volume Pencil Tool] [AI Analysis Tool] | Active Asset: linh_ngua_powerup.wav |
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+─────────────────────────────────────────────────────────────────────────────────────────────+
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```
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### 7.1. Functional Mapping Matrix:
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* **Record (● Red Indicator):** Drives live microphone capture sequences targeted straight into the isolated sub-tab data matrix.
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* **Back (◀◀ Rewind):** Resets the timeline playhead position index back to the absolute starting point ($t = 0.0\text{ s}$).
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* **Play / Pause / Stop:** Coordinates low-latency runtime audio execution tracking locked onto the sub-tab's RAM cache blocks.
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* **Rate Slider:** Adjusts the global monitoring playback pitch speed metrics in real time without overwriting source asset length (calibrated step ranges variable from `-1.00` scaling up to `+1.00`).
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* **Loop Toggle:** Toggles continuous cycle loops over the highlighted section or the whole clip.
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* **Volume Pencil Tool:** Engages the drawing framework to map point nodes for automated amplitude envelopes.
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* **AI Analysis Tool:** Instructs the dockerized engine to evaluate rhythmic transient markers and pitch tracking grids.
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---
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## 8. Volume Automation Envelope (Pen Tool)
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This advanced timeline automation layer allows audio designers to draw custom gain curves over the background waveform graphics.
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```text
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VOLUME AUTOMATION ENVELOPE (PEN TOOL)
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+3 dB ──────────────────────────────────────────────────────────────
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\ Node 1 Node 3
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\ ○ ○
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0 dB ───\────/─\─────────────────────────────────────/─\─────────── (0 dB Unity Gain Axis)
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\ / \ / \
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\/ \ / \
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○ \_______________________________/ \________
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Node 2 Node 4
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-30 dB ──────────────────────────────────────────────────────────────
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|<─────────────────── Horizontal Axis (Time) ─────────────────────>|
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```
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### 8.1. Pen Tool Interaction Mechanics
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* **Activation:** Clicking the designated Pencil Tool icon in the control panel modifies the pointer device presentation into a pencil graphic.
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* **Envelope Initialization:** Activating the Pen Tool generates a solid horizontal neon green line representing $0\text{ dB}$ (Unity Gain) across the track workspace, acting as the baseline master axis.
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* **Drawing Automation Curves:**
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* Left-clicking anywhere along this line creates an adjustable anchor point (**Control Node**).
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* Dragging an initialized control node upward increases signal amplitude (up to a maximal ceiling boundary of $+3\text{ dB}$).
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* Dragging a control node downward reduces signal amplitude (down to a lower attenuation floor of $-30\text{ dB}$).
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* The graphics framework automatically updates straight vector paths between sequential nodes utilizing simple linear interpolation.
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### 8.2. DSP Volume Envelope Math
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Given two chronologically adjacent drawn points $P_1(t_1, V_1)$ and $P_2(t_2, V_2)$, the targeted instantaneous decibel gain variable $V_{\text{dB}}(t)$ at an arbitrary time index $t$ ($t_1 \le t \le t_2$) matches the following linear equation:
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$$V_{\text{dB}}(t) = V_1 + (t - t_1) \cdot \frac{V_2 - V_1}{t_2 - t_1}$$
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This decibel value must be translated into a standard linear gain scalar coefficient $G_{\text{linear}}(t)$ to multiply it into the core audio sample stream values:
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$$G_{\text{linear}}(t) = 10^{\frac{\text{V}_{\text{dB}}(t)}{20}}$$
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$$x_{\text{automation}}[n] = x[n] \cdot G_{\text{linear}}\left( \frac{n}{\text{Sample Rate}} \right)$$
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---
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## 9. Porting Guidelines for Python Desktop Layouts (PyQt6 QPainter Context)
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When translating the polyline vector engine and the symmetrical decibel gridding lines into a containerized desktop application using the native `QPainter` canvas inside PyQt6, leveraging a structured `QPainterPath` prevents rendering lag when mapping high-density signal segments:
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```python
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# [PYTHON PORTING BLUEPRINT] - Continuous Polyline Waveform Rendering via QPainterPath
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from PyQt6.QtGui import QPainter, QPainterPath, QPen, QColor
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from PyQt6.QtCore import QPointF, Qt
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import numpy as np
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def paint_continuous_waveform_path(painter: QPainter, rect_width: int, rect_height: int, y: np.ndarray, zoom_level: float):
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"""
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Renders a unified continuous single polyline path tracing absolute physical signal transitions.
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y: A 1D NumPy float32 array tracking raw sample amplitudes bounded within [-1.0, 1.0].
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zoom_level: The scale allocation mapping physical drawing pixels per second of audio data.
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"""
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if len(y) == 0:
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return
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painter.setRenderHint(QPainter.RenderHint.Antialiasing, True)
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mid_y = rect_height / 2.0
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# 1. Compile background Decibel reference grids (-6.0 dB, -Inf. dB, -6.0 dB)
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grid_pen = QPen(QColor(45, 45, 45), 1, Qt.PenStyle.DashLine)
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painter.setPen(grid_pen)
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# A threshold of -6.0 dB maps approximately to an absolute scalar amplitude index of 0.501
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y_6db_top = mid_y - (0.501 * (rect_height * 0.42))
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y_6db_bottom = mid_y + (0.501 * (rect_height * 0.42))
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painter.drawLine(0, int(y_6db_top), rect_width, int(y_6db_top))
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painter.drawLine(0, int(y_6db_bottom), rect_width, int(y_6db_bottom))
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# Paint the absolute Zero-Line horizontal center axis (-Inf. dB)
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center_pen = QPen(QColor(60, 60, 60), 1, Qt.PenStyle.SolidLine)
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painter.setPen(center_pen)
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painter.drawLine(0, int(mid_y), rect_width, int(mid_y))
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# 2. Initialize the Continuous Vector Polyline Route Layout Block
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wave_path = QPainterPath()
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wave_pen = QPen(QColor(100, 149, 237), 1.2, Qt.PenStyle.SolidLine) # Professional Cornflower Blue
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painter.setPen(wave_pen)
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# Map raw buffer indexes into structural coordinate pixels
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start_point_set = False
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for x_pixel in range(rect_width):
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# Translate current canvas pixel offset back to timeline seconds metrics
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time_at_pixel = x_pixel / zoom_level
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# Calculate target array element offset
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sample_index = int(time_at_pixel * 44100) # Assuming project sample rate baseline at 44.1kHz
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if sample_index >= len(y):
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break
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amplitude = y[sample_index]
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y_pixel = mid_y + (amplitude * (rect_height * 0.42))
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if not start_point_set:
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wave_path.moveTo(float(x_pixel), y_pixel)
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start_point_set = True
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else:
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wave_path.lineTo(float(x_pixel), y_pixel)
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# Draw the continuous vector polyline overlay onto the viewport canvas
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painter.drawPath(wave_path)
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``` |