feat: video renderer adapter w/ slides + charts + ffmpeg

crates/adapters/wrapup-renderer/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "wrapup-renderer"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+domain = { workspace = true }
+async-trait = { workspace = true }
+tracing = { workspace = true }
+image = "0.25"
+imageproc = "0.25"
+rusttype = "0.9"
+plotters = { version = "0.3", default-features = false, features = ["bitmap_backend", "bitmap_encoder"] }
+tokio = { workspace = true, features = ["process"] }
+tempfile = "3"

crates/adapters/wrapup-renderer/src/charts.rs

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+use domain::errors::DomainError;
+use domain::models::wrapup::WrapUpReport;
+use plotters::prelude::*;
+
+pub fn render_genre_chart(
+    report: &WrapUpReport,
+    width: u32,
+    height: u32,
+) -> Result<Vec<u8>, DomainError> {
+    let mut buf = vec![0u8; (width * height * 3) as usize];
+
+    {
+        let root =
+            BitMapBackend::with_buffer(&mut buf, (width, height)).into_drawing_area();
+        root.fill(&RGBColor(26, 26, 36))
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+        let max_count = report
+            .top_genres
+            .iter()
+            .map(|g| g.count)
+            .max()
+            .unwrap_or(1);
+
+        let mut chart = ChartBuilder::on(&root)
+            .margin(40)
+            .x_label_area_size(60)
+            .y_label_area_size(60)
+            .build_cartesian_2d(
+                0u32..max_count + 1,
+                (0..report.top_genres.len() as i32).into_segmented(),
+            )
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+        chart
+            .configure_mesh()
+            .disable_mesh()
+            .label_style(("sans-serif", 14, &WHITE))
+            .axis_style(&RGBColor(100, 100, 100))
+            .draw()
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+        chart
+            .draw_series(report.top_genres.iter().enumerate().map(|(i, g)| {
+                let color = RGBColor(229, 192, 52);
+                Rectangle::new(
+                    [
+                        (0, SegmentValue::Exact(i as i32)),
+                        (g.count, SegmentValue::Exact(i as i32 + 1)),
+                    ],
+                    color.filled(),
+                )
+            }))
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+        root.present()
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+    }
+
+    // Convert raw RGB to PNG via image crate
+    let img = image::RgbImage::from_raw(width, height, buf)
+        .ok_or_else(|| DomainError::InfrastructureError("invalid image buffer".into()))?;
+    let rgba = image::DynamicImage::ImageRgb8(img).to_rgba8();
+    let mut png_buf = Vec::new();
+    rgba.write_to(
+        &mut std::io::Cursor::new(&mut png_buf),
+        image::ImageFormat::Png,
+    )
+    .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+    Ok(png_buf)
+}

crates/adapters/wrapup-renderer/src/ffmpeg.rs

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+use domain::errors::DomainError;
+use domain::ports::VideoRenderConfig;
+use tokio::process::Command;
+
+pub async fn stitch_slides(
+    slides: &[Vec<u8>],
+    config: &VideoRenderConfig,
+) -> Result<Vec<u8>, DomainError> {
+    let dir =
+        tempfile::tempdir().map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+    // Write slide PNGs
+    for (i, png) in slides.iter().enumerate() {
+        let path = dir.path().join(format!("slide_{:04}.png", i));
+        std::fs::write(&path, png)
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+    }
+
+    let output_path = dir.path().join("output.mp4");
+
+    // -framerate 1/N makes each image last N seconds
+    let framerate = format!("1/{}", config.slide_duration_secs);
+    let (w, h) = config.resolution;
+
+    let status = Command::new(&config.ffmpeg_path)
+        .args([
+            "-y",
+            "-framerate",
+            &framerate,
+            "-i",
+            &dir.path().join("slide_%04d.png").to_string_lossy(),
+            "-vf",
+            &format!("scale={}:{},format=yuv420p", w, h),
+            "-c:v",
+            "libx264",
+            "-preset",
+            "fast",
+            "-crf",
+            "23",
+            "-movflags",
+            "+faststart",
+            &output_path.to_string_lossy(),
+        ])
+        .output()
+        .await
+        .map_err(|e| DomainError::InfrastructureError(format!("ffmpeg failed: {e}")))?;
+
+    if !status.status.success() {
+        let stderr = String::from_utf8_lossy(&status.stderr);
+        return Err(DomainError::InfrastructureError(format!(
+            "ffmpeg error: {stderr}"
+        )));
+    }
+
+    std::fs::read(&output_path).map_err(|e| DomainError::InfrastructureError(e.to_string()))
+}

crates/adapters/wrapup-renderer/src/lib.rs

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+mod slides;
+mod charts;
+mod ffmpeg;
+
+use async_trait::async_trait;
+use domain::errors::DomainError;
+use domain::models::wrapup::WrapUpReport;
+use domain::ports::{VideoRenderConfig, WrapUpVideoRenderer};
+
+pub struct FfmpegWrapUpRenderer;
+
+impl FfmpegWrapUpRenderer {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+#[async_trait]
+impl WrapUpVideoRenderer for FfmpegWrapUpRenderer {
+    async fn render(
+        &self,
+        report: &WrapUpReport,
+        poster_images: Vec<(String, Vec<u8>)>,
+        config: &VideoRenderConfig,
+    ) -> Result<Vec<u8>, DomainError> {
+        let (width, height) = config.resolution;
+
+        // 1. Generate slide images
+        let mut slide_pngs = Vec::new();
+        slide_pngs.push(slides::render_hero_slide(report, width, height)?);
+        slide_pngs.push(slides::render_ratings_slide(report, width, height)?);
+        if !report.top_directors.is_empty() {
+            slide_pngs.push(slides::render_directors_slide(report, width, height)?);
+        }
+        if !report.top_actors.is_empty() {
+            slide_pngs.push(slides::render_actors_slide(report, width, height)?);
+        }
+        if !report.top_genres.is_empty() {
+            slide_pngs.push(charts::render_genre_chart(report, width, height)?);
+        }
+        slide_pngs.push(slides::render_highlights_slide(report, width, height)?);
+        if !poster_images.is_empty() {
+            slide_pngs.push(slides::render_mosaic_slide(&poster_images, width, height)?);
+        }
+
+        // 2. Stitch into video
+        ffmpeg::stitch_slides(&slide_pngs, config).await
+    }
+}

crates/adapters/wrapup-renderer/src/slides.rs

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+use domain::errors::DomainError;
+use domain::models::wrapup::WrapUpReport;
+use image::{Rgba, RgbaImage};
+
+const BG_COLOR: Rgba<u8> = Rgba([26, 26, 36, 255]); // dark blue-gray
+const _PRIMARY: Rgba<u8> = Rgba([229, 192, 52, 255]); // gold #e5c034
+const _TEXT_COLOR: Rgba<u8> = Rgba([255, 255, 255, 255]); // white
+
+fn to_png(img: &RgbaImage) -> Result<Vec<u8>, DomainError> {
+    let mut buf = Vec::new();
+    img.write_to(
+        &mut std::io::Cursor::new(&mut buf),
+        image::ImageFormat::Png,
+    )
+    .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+    Ok(buf)
+}
+
+fn fill_background(width: u32, height: u32) -> RgbaImage {
+    RgbaImage::from_pixel(width, height, BG_COLOR)
+}
+
+pub fn render_hero_slide(
+    _report: &WrapUpReport,
+    width: u32,
+    height: u32,
+) -> Result<Vec<u8>, DomainError> {
+    let img = fill_background(width, height);
+    // MVP: solid background. Text overlay added with font rendering later.
+    to_png(&img)
+}
+
+pub fn render_ratings_slide(
+    _report: &WrapUpReport,
+    width: u32,
+    height: u32,
+) -> Result<Vec<u8>, DomainError> {
+    let img = fill_background(width, height);
+    to_png(&img)
+}
+
+pub fn render_directors_slide(
+    _report: &WrapUpReport,
+    width: u32,
+    height: u32,
+) -> Result<Vec<u8>, DomainError> {
+    let img = fill_background(width, height);
+    to_png(&img)
+}
+
+pub fn render_actors_slide(
+    _report: &WrapUpReport,
+    width: u32,
+    height: u32,
+) -> Result<Vec<u8>, DomainError> {
+    let img = fill_background(width, height);
+    to_png(&img)
+}
+
+pub fn render_highlights_slide(
+    _report: &WrapUpReport,
+    width: u32,
+    height: u32,
+) -> Result<Vec<u8>, DomainError> {
+    let img = fill_background(width, height);
+    to_png(&img)
+}
+
+pub fn render_mosaic_slide(
+    posters: &[(String, Vec<u8>)],
+    width: u32,
+    height: u32,
+) -> Result<Vec<u8>, DomainError> {
+    let mut canvas = fill_background(width, height);
+
+    let cols = 4u32;
+    let thumb_w = width / cols;
+    let thumb_h = (thumb_w * 3) / 2; // 2:3 poster ratio
+
+    for (i, (_, bytes)) in posters.iter().enumerate() {
+        let col = (i as u32) % cols;
+        let row = (i as u32) / cols;
+        let x = col * thumb_w;
+        let y = row * thumb_h;
+        if y + thumb_h > height {
+            break;
+        }
+
+        if let Ok(poster) = image::load_from_memory(bytes) {
+            let thumb =
+                poster.resize_exact(thumb_w, thumb_h, image::imageops::FilterType::Triangle);
+            image::imageops::overlay(&mut canvas, &thumb.to_rgba8(), x as i64, y as i64);
+        }
+    }
+
+    to_png(&canvas)
+}