video: Move software decoding into core now that we don't need to specialize per-renderer

Cargo.lock

@@ -1705,6 +1705,11 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "h263-rs-yuv"
+version = "0.1.0"
+source = "git+https://github.com/ruffle-rs/h263-rs?rev=837f075d280680abc8dd3fc3d47656d5a770c48e#837f075d280680abc8dd3fc3d47656d5a770c48e"
+
 [[package]]
 name = "hashbrown"
 version = "0.9.1"
@@ -3039,6 +3044,7 @@ dependencies = [
  "generational-arena",
  "gif",
  "h263-rs",
+ "h263-rs-yuv",
  "indexmap",
  "instant",
  "jpeg-decoder",

core/Cargo.toml

@@ -37,6 +37,7 @@ rand = { version = "0.8.4", features = ["std", "small_rng"], default-features =
 serde = { version = "1.0.127", features = ["derive"], optional = true }
 nellymoser-rs = { git = "https://github.com/ruffle-rs/nellymoser" }
 h263-rs = { git = "https://github.com/ruffle-rs/h263-rs", rev = "837f075d280680abc8dd3fc3d47656d5a770c48e" }
+h263-rs-yuv = { git = "https://github.com/ruffle-rs/h263-rs", rev = "837f075d280680abc8dd3fc3d47656d5a770c48e" }
 regress = "0.4"
 flash-lso = { git = "https://github.com/ruffle-rs/rust-flash-lso", rev = "19fecd07b9888c4bdaa66771c468095783b52bed" }
 json = "0.12.4"

core/src/backend/video/software.rs

@@ -7,6 +7,7 @@ use crate::backend::video::{
 use generational_arena::Arena;
 use h263_rs::parser::{decode_picture, H263Reader};
 use h263_rs::{DecoderOption, H263State, PictureTypeCode};
+use h263_rs_yuv::bt601::yuv420_to_rgba;
 use swf::{VideoCodec, VideoDeblocking};
 
 /// A single preloaded video stream.
@@ -61,7 +62,7 @@ impl VideoBackend for SoftwareVideoBackend {
             .ok_or("Unregistered video stream")?;
 
         match stream {
-            VideoStream::H263(state) => {
+            VideoStream::H263(_state) => {
                 let mut reader = H263Reader::from_source(encoded_frame.data());
                 let picture =
                     decode_picture(&mut reader, DecoderOption::SORENSON_SPARK_BITSTREAM, None)?
@@ -98,10 +99,20 @@ impl VideoBackend for SoftwareVideoBackend {
                     .get_last_picture()
                     .expect("Decoding a picture should let us grab that picture");
 
-                //TODO: YUV 4:2:0 decoding
-                //TODO: Construct a bitmap drawable for the renderer and hand
-                //it back
-                unimplemented!("oops");
+                let (width, height) = picture
+                    .format()
+                    .into_width_and_height()
+                    .ok_or("H.263 decoder error!")?;
+                let (y, b, r) = picture.as_yuv();
+                let rgba = yuv420_to_rgba(y, b, r, width.into());
+
+                let handle = renderer.register_bitmap_raw(width.into(), height.into(), rgba)?;
+
+                Ok(BitmapInfo {
+                    handle,
+                    width,
+                    height,
+                })
             }
         }
     }