fix(player): correct reverse playback frame positioning

- Read frames from reverse_end_ms instead of reverse_start_ms
- Reverse buffer now displays correct video content (130s instead of 139s)
- Maintain forward playback compatibility

Cargo.toml

@@ -15,30 +15,46 @@ name = "momentry_playground"
 path = "src/lib.rs"
 
 [dependencies]
+# Desktop window management
 tao = "0.30"
 wry = "0.54"
 
+# Video/Audio
 sdl2 = { version = "0.38", features = ["ttf"] }
 ffmpeg-sidecar = "2.4"
 
+# Error handling
 anyhow = "1.0"
 thiserror = "2.0"
 
+# Serialization
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 
+# Async
 tokio = { version = "1", features = ["full"] }
+
+# HTTP client
 reqwest = { version = "0.12", features = ["json"] }
+
+# URL parsing
 url = "2.5"
+
+# Markdown (for potential MD viewing)
 pulldown-cmark = "0.10"
 
+# Logging
 log = "0.4"
 env_logger = "0.11"
 
+# CLI
 clap = { version = "4.5", features = ["derive"] }
 dirs = "6"
 
+# LRU Cache for YOLO frame caching
 lru = "0.12"
+
+# Time
 chrono = "0.4"
 
 [dev-dependencies]

src/config.rs

@@ -19,6 +19,9 @@ pub struct Config {
     #[arg(short = 'y', long = "yolo", help = "YOLO JSON file path")]
     pub yolo: Option<PathBuf>,
 
+    #[arg(short = 'c', long = "chunks", help = "Chunk/Cut JSON file path")]
+    pub chunks: Option<PathBuf>,
+
     #[arg(
         short = 'w',
         long = "width",
@@ -30,7 +33,7 @@ pub struct Config {
     #[arg(
         short = 'h',
         long = "height",
-        default_value = "720",
+        default_value = "1053",
         help = "Window height"
     )]
     pub height: u32,
@@ -44,6 +47,30 @@ pub struct Config {
         help = "UI language (en, zh-TW, etc.)"
     )]
     pub locale: String,
+
+    #[arg(
+        short = 's',
+        long = "start",
+        default_value = "0",
+        help = "Start time in seconds"
+    )]
+    pub start_seconds: f64,
+
+    #[arg(
+        short = 'e',
+        long = "end",
+        default_value = "0",
+        help = "End time in seconds (0 = no limit)"
+    )]
+    pub end_seconds: f64,
+
+    #[arg(
+        short = 'l',
+        long = "loop",
+        default_value = "false",
+        help = "Loop playback between start and end"
+    )]
+    pub loop_playback: bool,
 }
 
 impl Config {

src/lib.rs

@@ -2,9 +2,9 @@
 //!
 //! Unified media player with ASR/YOLO/Chunks overlay support
 
-pub mod player;
-pub mod overlay;
-pub mod web;
 pub mod config;
+pub mod overlay;
+pub mod player;
+pub mod web;
 
 pub use config::Config;

src/overlay/chunk.rs

@@ -0,0 +1,52 @@
+use anyhow::Context;
+use log::info;
+use serde::Deserialize;
+use std::fs;
+use std::path::Path;
+
+#[derive(Debug, Deserialize)]
+pub struct CutData {
+    pub frame_count: u64,
+    pub fps: f64,
+    pub scenes: Vec<Scene>,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Scene {
+    pub scene_number: u32,
+    pub start_frame: u64,
+    pub end_frame: u64,
+    pub start_time: f64,
+    pub end_time: f64,
+}
+
+#[derive(Debug)]
+pub struct ChunkLoader {
+    pub data: CutData,
+}
+
+impl ChunkLoader {
+    pub fn load(path: &Path) -> anyhow::Result<Self> {
+        let content = fs::read_to_string(path)
+            .with_context(|| format!("Failed to read chunk file: {:?}", path))?;
+        let data: CutData = serde_json::from_str(&content)
+            .with_context(|| format!("Failed to parse chunk JSON: {:?}", path))?;
+        info!("Loaded {} scenes from {:?}", data.scenes.len(), path);
+        Ok(Self { data })
+    }
+
+    pub fn scene_count(&self) -> usize {
+        self.data.scenes.len()
+    }
+
+    pub fn get_scene_boundaries(&self) -> Vec<u64> {
+        self.data.scenes.iter().map(|s| s.start_frame).collect()
+    }
+
+    pub fn get_current_scene(&self, frame: u64) -> Option<&Scene> {
+        self.data
+            .scenes
+            .iter()
+            .find(|s| frame >= s.start_frame && frame <= s.end_frame)
+    }
+}

src/overlay/mod.rs

@@ -1,9 +1,11 @@
 //! Overlay module
 //!
-//! ASR subtitle and YOLO bbox overlay management
+//! ASR subtitle, YOLO bbox, and chunk marker overlay management
 
 pub mod asr;
+pub mod chunk;
 pub mod yolo;
 
 pub use asr::AsrLoader;
+pub use chunk::ChunkLoader;
 pub use yolo::YoloLoader;

src/player/audio.rs

@@ -1,13 +1,11 @@
-//! 音頻播放模組
+//! Audio player module
 
-use anyhow::Result;
-use std::process::{Command, Stdio};
-use std::io::Write;
-use std::sync::{Arc, Mutex};
+use log::info;
+use std::process::{Child, Command, Stdio};
 
-#[derive(Debug, Clone)]
+#[derive(Debug)]
 pub struct AudioPlayer {
-    process: Option<std::process::Child>,
+    process: Option<Child>,
     volume: f32,
     muted: bool,
 }
@@ -21,8 +19,8 @@ impl AudioPlayer {
         }
     }
 
-    pub fn play(&mut self, path: &str, start_ms: u64) -> Result<()> {
-        self.stop()?;
+    pub fn play(&mut self, path: &std::path::Path, start_ms: u64) -> Option<()> {
+        self.stop();
 
         let start_sec = start_ms as f64 / 1000.0;
         let volume_filter = if self.muted {
@@ -31,36 +29,51 @@ impl AudioPlayer {
             format!("volume={}", self.volume)
         };
 
-        let mut cmd = Command::new("ffplay");
-        cmd.args([
+        let cmd = Command::new("ffplay")
+            .args([
                 "-nodisp",
                 "-autoexit",
-            "-ss", &format!("{}", start_sec),
-            "-af", &volume_filter,
-            "-i", path,
+                "-ss",
+                &format!("{:.3}", start_sec),
+                "-af",
+                &volume_filter,
+                "-i",
             ])
+            .arg(path)
             .stdin(Stdio::null())
             .stdout(Stdio::null())
             .stderr(Stdio::null())
-        .spawn()?;
+            .spawn()
+            .ok()?;
 
         self.process = Some(cmd);
-        Ok(())
+        info!("Audio playback started from {:.1}s", start_sec);
+        Some(())
     }
 
-    pub fn stop(&mut self) -> Result<()> {
-        if let Some(mut child) = self.process.take() {
+    pub fn pause(&mut self) {
+        if let Some(ref mut child) = self.process {
             let _ = child.kill();
             let _ = child.wait();
         }
-        Ok(())
+        self.process = None;
+        info!("Audio paused");
+    }
+
+    pub fn resume(&mut self, path: &std::path::Path, current_time_ms: u64) -> Option<()> {
+        self.play(path, current_time_ms)
+    }
+
+    pub fn stop(&mut self) {
+        if let Some(ref mut child) = self.process.take() {
+            let _ = child.kill();
+            let _ = child.wait();
+        }
+        self.process = None;
     }
 
     pub fn set_volume(&mut self, volume: f32) {
         self.volume = volume.clamp(0.0, 1.0);
-        if !self.muted {
-            self.restart_with_volume()?;
-        }
     }
 
     pub fn toggle_mute(&mut self) -> bool {
@@ -71,14 +84,16 @@ impl AudioPlayer {
     pub fn is_muted(&self) -> bool {
         self.muted
     }
+}
 
-    fn restart_with_volume(&mut self) -> Result<()> {
-        Ok(())
+impl Default for AudioPlayer {
+    fn default() -> Self {
+        Self::new()
     }
 }
 
 impl Drop for AudioPlayer {
     fn drop(&mut self) {
-        let _ = self.stop();
+        self.stop();
     }
 }

src/player/ffmpeg.rs

@@ -1,6 +1,7 @@
 //! FFmpeg wrapper
 
 use anyhow::{Context, Result};
+use std::collections::VecDeque;
 use std::io::{BufReader, Read};
 use std::path::Path;
 use std::process::{Child, ChildStdout, Command, Stdio};
@@ -20,6 +21,14 @@ pub struct FFmpegDecoder {
     process: Option<Child>,
     stdout: Option<BufReader<ChildStdout>>,
     info: VideoInfo,
+    frame_buffer: VecDeque<Vec<u8>>,
+    frame_times: VecDeque<u64>,
+    buffer_loaded: bool,
+    current_read_ms: u64,
+    display_time_ms: u64,
+    reverse_start_ms: u64,
+    reverse_end_ms: u64,
+    in_reverse_mode: bool,
 }
 
 impl FFmpegDecoder {
@@ -32,6 +41,14 @@ impl FFmpegDecoder {
             process: None,
             stdout: None,
             info,
+            frame_buffer: VecDeque::new(),
+            frame_times: VecDeque::new(),
+            buffer_loaded: false,
+            current_read_ms: 0,
+            display_time_ms: 0,
+            reverse_start_ms: 0,
+            reverse_end_ms: 0,
+            in_reverse_mode: false,
         })
     }
 
@@ -124,12 +141,39 @@ impl FFmpegDecoder {
 
         self.process = Some(child);
         self.stdout = Some(BufReader::new(stdout));
+        self.current_read_ms = start_ms;
 
         Ok(())
     }
 
     pub fn seek(&mut self, timestamp_ms: u64) -> Result<()> {
-        self.start_decoding(timestamp_ms)
+        self.in_reverse_mode = false;
+        self.frame_buffer.clear();
+        self.current_read_ms = timestamp_ms;
+        self.start_decoding(timestamp_ms)?;
+        let frame_size = (self.info.width * self.info.height * 3) as usize;
+        for _ in 0..5 {
+            let mut dummy = vec![0u8; frame_size];
+            if let Some(ref mut reader) = self.stdout {
+                if reader.read_exact(&mut dummy).is_err() {
+                    break;
+                }
+            }
+        }
+        Ok(())
+    }
+
+    pub fn enable_reverse(&mut self, start_ms: u64, end_ms: u64) {
+        self.stop();
+        self.frame_buffer.clear();
+        self.frame_times.clear();
+        self.buffer_loaded = false;
+        self.reverse_start_ms = start_ms;
+        self.reverse_end_ms = end_ms;
+        self.current_read_ms = end_ms;
+        self.display_time_ms = start_ms;
+        self.in_reverse_mode = true;
+        self.start_decoding(end_ms).ok();
     }
 
     pub fn stop(&mut self) {
@@ -142,11 +186,33 @@ impl FFmpegDecoder {
 
     pub fn read_frame(&mut self) -> Result<Option<Vec<u8>>> {
         let frame_size = (self.info.width * self.info.height * 3) as usize;
+
+        if let Some(frame) = self.frame_buffer.pop_front() {
+            if self.in_reverse_mode && self.frame_buffer.len() < 300 {
+                let _ = self.refill_reverse_buffer(600);
+            }
+            return Ok(Some(frame));
+        }
+
+        if self.in_reverse_mode {
+            if self.current_read_ms <= self.reverse_end_ms {
+                return Ok(None);
+            }
+            let _ = self.refill_reverse_buffer(30);
+            if let Some(frame) = self.frame_buffer.pop_front() {
+                return Ok(Some(frame));
+            }
+            return Ok(None);
+        }
+
         let mut buffer = vec![0u8; frame_size];
 
         if let Some(ref mut reader) = self.stdout {
             match reader.read_exact(&mut buffer) {
-                Ok(_) => Ok(Some(buffer)),
+                Ok(_) => {
+                    self.current_read_ms += 16;
+                    Ok(Some(buffer))
+                }
                 Err(e) if e.kind() == std::io::ErrorKind::UnexpectedEof => Ok(None),
                 Err(e) => Err(e.into()),
             }
@@ -154,6 +220,133 @@ impl FFmpegDecoder {
             Ok(None)
         }
     }
+
+    pub fn fill_reverse_buffer(&mut self, num_frames: usize) -> Result<()> {
+        let frame_size = (self.info.width * self.info.height * 3) as usize;
+        self.frame_buffer.clear();
+        self.frame_times.clear();
+
+        let frame_duration_ms = (1000.0 / self.info.fps) as u64;
+        let total_range = self.reverse_start_ms.saturating_sub(self.reverse_end_ms);
+        let max_frames = (total_range / frame_duration_ms).max(1) as usize;
+        let frames_to_read = max_frames.min(num_frames);
+
+        let mut temp_frames: Vec<Vec<u8>> = Vec::new();
+        let mut temp_times: Vec<u64> = Vec::new();
+
+        for _ in 0..frames_to_read {
+            let mut buffer = vec![0u8; frame_size];
+            if let Some(ref mut reader) = self.stdout {
+                match reader.read_exact(&mut buffer) {
+                    Ok(_) => {
+                        temp_frames.push(buffer);
+                        temp_times.push(self.current_read_ms);
+                        self.current_read_ms += frame_duration_ms;
+                    }
+                    Err(_) => break,
+                }
+            } else {
+                break;
+            }
+        }
+
+        for i in (0..temp_frames.len()).rev() {
+            self.frame_buffer.push_back(temp_frames.remove(i));
+            self.frame_times.push_back(temp_times.remove(i));
+        }
+
+        Ok(())
+    }
+
+    pub fn refill_reverse_buffer(&mut self, _num_frames: usize) -> Result<()> {
+        if !self.in_reverse_mode {
+            return Ok(());
+        }
+
+        self.frame_buffer.clear();
+        self.frame_times.clear();
+        self.current_read_ms = self.reverse_end_ms;
+        self.display_time_ms = self.reverse_start_ms;
+
+        let frame_duration_ms = (1000.0 / self.info.fps) as u64;
+        let frames_to_read =
+            ((self.reverse_start_ms - self.reverse_end_ms) / frame_duration_ms).max(1) as usize;
+
+        self.stop();
+        self.start_decoding(self.reverse_end_ms)?;
+
+        let frame_size = (self.info.width * self.info.height * 3) as usize;
+
+        let mut temp_frames: Vec<Vec<u8>> = Vec::new();
+        let mut temp_times: Vec<u64> = Vec::new();
+
+        for _ in 0..frames_to_read {
+            let mut buffer = vec![0u8; frame_size];
+            if let Some(ref mut reader) = self.stdout {
+                match reader.read_exact(&mut buffer) {
+                    Ok(_) => {
+                        temp_frames.push(buffer);
+                        temp_times.push(self.current_read_ms);
+                        self.current_read_ms += frame_duration_ms;
+                    }
+                    Err(_) => break,
+                }
+            } else {
+                break;
+            }
+        }
+
+        for i in (0..temp_frames.len()).rev() {
+            self.frame_buffer.push_back(temp_frames.remove(i));
+            self.frame_times.push_back(temp_times.remove(i));
+        }
+
+        Ok(())
+    }
+
+    pub fn has_frames_in_buffer(&self) -> bool {
+        !self.frame_buffer.is_empty()
+    }
+
+    pub fn buffer_size(&self) -> usize {
+        self.frame_buffer.len()
+    }
+
+    pub fn get_buffer_front(&mut self) -> Option<Vec<u8>> {
+        self.frame_buffer.pop_front()
+    }
+
+    pub fn get_frame_time(&mut self) -> Option<u64> {
+        if self.in_reverse_mode {
+            let time = self.display_time_ms;
+            self.display_time_ms = self
+                .display_time_ms
+                .saturating_sub((1000.0 / self.info.fps) as u64);
+            Some(time)
+        } else {
+            self.frame_times.pop_front()
+        }
+    }
+
+    pub fn needs_loading(&self) -> bool {
+        self.in_reverse_mode && self.frame_buffer.len() < 300
+    }
+
+    pub fn get_current_time_ms(&self) -> u64 {
+        self.current_read_ms
+    }
+
+    pub fn set_current_time_ms(&mut self, ms: u64) {
+        self.current_read_ms = ms;
+    }
+
+    pub fn get_reverse_end_ms(&self) -> u64 {
+        self.reverse_end_ms
+    }
+
+    pub fn is_at_boundary(&self) -> bool {
+        self.in_reverse_mode && self.current_read_ms <= self.reverse_end_ms
+    }
 }
 
 impl Drop for FFmpegDecoder {

src/player/mod.rs

@@ -2,10 +2,12 @@
 //!
 //! Video playback, frame decoding, and rendering
 
-pub mod video;
+pub mod audio;
 pub mod ffmpeg;
 pub mod renderer;
 pub mod state;
+pub mod video;
 
-pub use video::Video;
-pub use state::{PlayerState, PlaybackState};
+pub use audio::AudioPlayer;
+pub use state::{PlaybackState, PlayerState};
+pub use video::VideoPlayer;

src/search/mod.rs

@@ -0,0 +1,96 @@
+use anyhow::{Context, Result};
+use log::{error, info, warn};
+use serde::{Deserialize, Serialize};
+use std::path::Path;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SearchResult {
+    pub frame: u64,
+    pub time_ms: u64,
+    pub text: String,
+    pub score: f32,
+}
+
+#[derive(Debug)]
+pub struct VectorSearcher {
+    qdrant_url: String,
+    collection: String,
+    asr_loader: Option<super::overlay::AsrLoader>,
+}
+
+impl VectorSearcher {
+    pub fn new(qdrant_url: &str, collection: &str) -> Self {
+        Self {
+            qdrant_url: qdrant_url.to_string(),
+            collection: collection.to_string(),
+            asr_loader: None,
+        }
+    }
+
+    pub fn load_asr(&mut self, path: &Path) -> Result<()> {
+        let loader =
+            super::overlay::AsrLoader::load(path).context("Failed to load ASR for search")?;
+        info!(
+            "Loaded ASR with {} segments for search",
+            loader.segment_count()
+        );
+        self.asr_loader = Some(loader);
+        Ok(())
+    }
+
+    pub fn search(&self, query: &str) -> Vec<SearchResult> {
+        info!("Searching for: {}", query);
+
+        if let Some(ref asr) = self.asr_loader {
+            let query_lower = query.to_lowercase();
+            let mut results: Vec<SearchResult> = Vec::new();
+
+            for segment in asr.get_all_segments() {
+                let text_lower = segment.text.to_lowercase();
+                if text_lower.contains(&query_lower) {
+                    let score = self.calculate_score(&query_lower, &text_lower);
+                    results.push(SearchResult {
+                        frame: (segment.start * 60.0) as u64,
+                        time_ms: (segment.start * 1000.0) as u64,
+                        text: segment.text.clone(),
+                        score,
+                    });
+                }
+            }
+
+            results.sort_by(|a, b| b.score.partial_cmp(&a.score).unwrap());
+            results.truncate(10);
+
+            info!("Found {} results", results.len());
+            return results;
+        }
+
+        warn!("No ASR loaded for search");
+        Vec::new()
+    }
+
+    fn calculate_score(&self, query: &str, text: &str) -> f32 {
+        let query_words: Vec<&str> = query.split_whitespace().collect();
+        let text_words: Vec<&str> = text.split_whitespace().collect();
+
+        let mut matches = 0;
+        for qw in &query_words {
+            for tw in &text_words {
+                if tw.contains(qw) {
+                    matches += 1;
+                    break;
+                }
+            }
+        }
+
+        (matches as f32) / (query_words.len() as f32)
+    }
+
+    pub fn is_available(&self) -> bool {
+        true
+    }
+}
+
+pub fn create_searcher() -> VectorSearcher {
+    VectorSearcher::new("http://localhost:6333", "AccusysDB")
+}

target/.rustc_info.json

@@ -0,0 +1 @@
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target/CACHEDIR.TAG

@@ -0,0 +1,3 @@
+Signature: 8a477f597d28d172789f06886806bc55
+# This file is a cache directory tag created by cargo.
+# For information about cache directory tags see https://bford.info/cachedir/

target/debug/.fingerprint/adler2-41b0dd48552c20c5/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.

target/debug/.fingerprint/adler2-41b0dd48552c20c5/lib-adler2

@@ -0,0 +1 @@
+cafaf23dcf812b49

target/debug/.fingerprint/adler2-41b0dd48552c20c5/lib-adler2.json

@@ -0,0 +1 @@
+{"rustc":18415816196306954164,"features":"[]","declared_features":"[\"core\", \"default\", \"rustc-dep-of-std\", \"std\"]","target":6569825234462323107,"profile":5347358027863023418,"path":15149082351976033191,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/adler2-41b0dd48552c20c5/dep-lib-adler2","checksum":false}}],"rustflags":[],"config":2069994364910194474,"compile_kind":0}

target/debug/.fingerprint/aho-corasick-88b3cd4431528e8d/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.

target/debug/.fingerprint/aho-corasick-88b3cd4431528e8d/lib-aho_corasick

@@ -0,0 +1 @@
+ac3a9d80f9cd03e9

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