realmedia/rv3040: ignore slices with wrong headers

[nihav.git] / nihav-realmedia / src / codecs / rv3040.rs

diff --git a/nihav-realmedia/src/codecs/rv3040.rs b/nihav-realmedia/src/codecs/rv3040.rs
index 39549eb4b31358ebb9816b2485f137e5b7af4962..e45b62b0682204306551761a04f147b1a3871264 100644 (file)
--- a/nihav-realmedia/src/codecs/rv3040.rs
+++ b/nihav-realmedia/src/codecs/rv3040.rs
@@ -1,9 +1,10 @@
 use nihav_core::formats::YUV420_FORMAT;
 use nihav_core::frame::{NABufferType, NAVideoInfo, NAVideoBuffer, NAVideoBufferRef, FrameType, alloc_video_buffer};
-use nihav_core::codecs::{NADecoderSupport, MV, ZERO_MV, DecoderError, DecoderResult, IPBShuffler};
+use nihav_core::codecs::{NADecoderSupport, DecoderError, DecoderResult};
+use nihav_codec_support::codecs::{MV, ZERO_MV, IPBShuffler};
 use nihav_core::io::bitreader::{BitReader,BitReaderMode};
 use nihav_core::io::intcode::*;
-use nihav_core::data::GenericCache;
+use nihav_codec_support::data::GenericCache;
 use std::mem;
 
 use super::rv34codes::*;
@@ -514,7 +515,7 @@ fn parse_slice_offsets(src: &[u8], offsets: &mut Vec<usize>) -> DecoderResult<()
 
     if ini_off >= src.len() { return Err(DecoderError::ShortData); }
 
-    let mut br = BitReader::new(&src[1..], ini_off - 1, BitReaderMode::BE);
+    let mut br = BitReader::new(&src[1..ini_off], BitReaderMode::BE);
 
     for i in 0..num_slices {
         br.skip(32)?;
@@ -538,10 +539,23 @@ fn decode_slice_header(br: &mut BitReader, bd: &mut RV34BitstreamDecoder, slice_
     if slice_no < slice_offs.len() - 1 {
         let cur_pos = br.tell() as u32;
         br.seek((slice_offs[slice_no + 1] * 8) as u32)?;
-        let nhdr = bd.decode_slice_header(br, shdr.width, shdr.height)?;
+        if let Ok(nhdr) = bd.decode_slice_header(br, shdr.width, shdr.height) {
+            validate!(nhdr.start > shdr.start);
+            shdr.end = nhdr.start;
+        } else {
+            if slice_no + 2 < slice_offs.len() {
+                br.seek((slice_offs[slice_no + 2] * 8) as u32)?;
+                if let Ok(nhdr) = bd.decode_slice_header(br, shdr.width, shdr.height) {
+                    validate!(nhdr.start > shdr.start);
+                    shdr.end = nhdr.start;
+                } else {
+                    shdr.end = ((shdr.width + 15) >> 4) * ((shdr.height + 15) >> 4);
+                }
+            } else {
+                shdr.end = ((shdr.width + 15) >> 4) * ((shdr.height + 15) >> 4);
+            }
+        }
         br.seek(cur_pos)?;
-        validate!(nhdr.start > shdr.start);
-        shdr.end = nhdr.start;
     } else {
         shdr.end = ((shdr.width + 15) >> 4) * ((shdr.height + 15) >> 4);
     }
@@ -1080,7 +1094,7 @@ impl RV34Decoder {
         parse_slice_offsets(src, &mut slice_offs)?;
         let ini_off = slice_offs.len() * 8 + 1;
 
-        let mut br = BitReader::new(&src[ini_off..], src.len() - ini_off, BitReaderMode::BE);
+        let mut br = BitReader::new(&src[ini_off..], BitReaderMode::BE);
         let hdr0 = decode_slice_header(&mut br, bd, 0, slice_offs.as_slice(), self.width, self.height)?;
         validate!((hdr0.width != 0) && (hdr0.height != 0));
         self.width  = hdr0.width;