From df37d3b1df616e2b0a13d49bf0a9fb639a1efe27 Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Mon, 18 Oct 2021 18:57:40 +0200
Subject: [PATCH] support scale options

---
 src/main.rs | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index d677791..0a36cc8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -74,6 +74,7 @@ struct Transcoder {
     mux_opts:       Vec<OptionArgs>,
     istr_opts:      Vec<InputStreamOptions>,
     ostr_opts:      Vec<OutputStreamOptions>,
+    scale_opts:     Vec<(String, String)>,
     decoders:       Vec<Option<(Box<NADecoderSupport>, Box<dyn NADecoder>, Box<dyn FrameReorderer>)>>,
     encoders:       Vec<OutputMode>,
     no_video:       bool,
@@ -405,6 +406,20 @@ impl Transcoder {
         }
         true
     }
+    fn parse_scale_options(&mut self, opts: &str) -> bool {
+        for opt in opts.split(',') {
+            let oval: Vec<_> = opt.split('=').collect();
+            if oval.len() == 1 {
+                self.scale_opts.push((oval[0].to_string(), "".to_string()));
+            } else if oval.len() == 2 {
+                self.scale_opts.push((oval[0].to_string(), oval[1].to_string()));
+            } else {
+                println!("unrecognized option '{}'", opt);
+                return false;
+            }
+        }
+        true
+    }
     fn apply_decoder_options(&self, dec: &mut dyn NADecoder, str_id: u32) {
         if let Some(str_idx) = self.istr_opts.iter().position(|str| str.id == str_id) {
             let dec_opts = dec.get_supported_options();
@@ -456,7 +471,7 @@ impl Transcoder {
                                 OutputConvert::None
                             } else {
                                 let ofmt = ScaleInfo { fmt: dvinfo.format, width: dvinfo.width, height: dvinfo.height };
-                                let ret = NAScale::new(ofmt, ofmt);
+                                let ret = NAScale::new_with_options(ofmt, ofmt, &self.scale_opts);
                                 if ret.is_err() {
                                     println!("cannot create scaler");
                                     return false;
@@ -607,7 +622,7 @@ println!("stream {} ({}) can't be handled", istr.id, istr.get_info().get_name())
     }
 }
 
-fn encode_frame(dst_id: u32, encoder: &mut Box<dyn NAEncoder>, cvt: &mut OutputConvert, frm: NAFrameRef) -> bool {
+fn encode_frame(dst_id: u32, encoder: &mut Box<dyn NAEncoder>, cvt: &mut OutputConvert, frm: NAFrameRef, scale_opts: &[(String, String)]) -> bool {
     let buf = frm.get_buffer();
     let cbuf = match cvt {
             OutputConvert::None => buf,
@@ -616,7 +631,7 @@ fn encode_frame(dst_id: u32, encoder: &mut Box<dyn NAEncoder>, cvt: &mut OutputC
                 let last_ifmt = scaler.get_in_fmt();
                 if cur_ifmt != last_ifmt {
                     let ofmt = scaler.get_out_fmt();
-                    let ret = NAScale::new(cur_ifmt, ofmt);
+                    let ret = NAScale::new_with_options(cur_ifmt, ofmt, scale_opts);
                     if ret.is_err() {
                         println!("error re-initialising scaler for {} -> {}", cur_ifmt, ofmt);
                         return false;
@@ -671,6 +686,7 @@ fn main() {
         println!("  --input inputfile           - set input file");
         println!("  --input-format fmt          - force input format");
         println!("  --demuxer-options options   - set input demuxer options");
+        println!("  --scale-options options     - set scaler options");
         println!("  --output outputfile         - set output file");
         println!("  --output-format fmt         - force output format");
         println!("  --muxer-options options     - set output muxer options");
@@ -821,6 +837,13 @@ fn main() {
                     return;
                 }
             },
+            "--scale-options" => {
+                next_arg!(args, arg_idx);
+                if !transcoder.parse_scale_options(&args[arg_idx]) {
+                    println!("invalid scale option syntax");
+                    return;
+                }
+            },
             "--no-video" | "-vn" => {
                 transcoder.no_video = true;
             },
@@ -1032,7 +1055,7 @@ println!("stream {} - {} {}", i, s, info.get_name());
                     let frm = ret.unwrap();
                     reorderer.add_frame(frm);
                     while let Some(frm) = reorderer.get_frame() {
-                        if !encode_frame(dst_id, encoder, cvt, frm) {
+                        if !encode_frame(dst_id, encoder, cvt, frm, &transcoder.scale_opts) {
                             break;
                         }
                         while let Ok(Some(pkt)) = encoder.get_packet() {
@@ -1052,7 +1075,7 @@ println!("stream {} - {} {}", i, s, info.get_name());
         if let OutputMode::Encode(dst_id, ref mut encoder, ref mut cvt) = transcoder.encoders[src_id] {
             if let Some((_, _, ref mut reorderer)) = transcoder.decoders[src_id] {
                 while let Some(frm) = reorderer.get_last_frames() {
-                    if !encode_frame(dst_id, encoder, cvt, frm) {
+                    if !encode_frame(dst_id, encoder, cvt, frm, &transcoder.scale_opts) {
                         break;
                     }
                     while let Ok(Some(pkt)) = encoder.get_packet() {
-- 
2.30.2