From 9da33f04bbd89f18942bbafc6d135b5d3f102953 Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Sat, 16 Nov 2019 09:59:40 +0100
Subject: [PATCH] allow to skip index building

---
 nihav-commonfmt/src/demuxers/avi.rs       | 20 +++++++++++---------
 nihav-core/src/demuxers/mod.rs            |  4 ++++
 nihav-realmedia/src/demuxers/realmedia.rs |  6 +++++-
 3 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/nihav-commonfmt/src/demuxers/avi.rs b/nihav-commonfmt/src/demuxers/avi.rs
index 93ac060..3361806 100644
--- a/nihav-commonfmt/src/demuxers/avi.rs
+++ b/nihav-commonfmt/src/demuxers/avi.rs
@@ -224,16 +224,18 @@ impl<'a> AVIDemuxer<'a> {
             }
             rest_size -= csz;
         }
-        self.src.read_skip(self.movi_size)?;
-        while rest_size > 0 {
-            let ret = self.parse_chunk(strmgr, RIFFTag::Chunk(mktag!(b"idx1")), rest_size,0);
-            if ret.is_err() { break; }
-            let (csz, end) = ret.unwrap();
-            if end {
-                let _res = parse_idx1(&mut self.src, strmgr, seek_idx, csz, self.movi_pos);
-                break;
+        if !seek_idx.skip_index {
+            self.src.read_skip(self.movi_size)?;
+            while rest_size > 0 {
+                let ret = self.parse_chunk(strmgr, RIFFTag::Chunk(mktag!(b"idx1")), rest_size,0);
+                if ret.is_err() { break; }
+                let (csz, end) = ret.unwrap();
+                if end {
+                    let _res = parse_idx1(&mut self.src, strmgr, seek_idx, csz, self.movi_pos);
+                    break;
+                }
+                rest_size -= csz;
             }
-            rest_size -= csz;
         }
         if self.movi_pos != 0 {
             self.src.seek(SeekFrom::Start(self.movi_pos))?;
diff --git a/nihav-core/src/demuxers/mod.rs b/nihav-core/src/demuxers/mod.rs
index 0883782..ee2fe58 100644
--- a/nihav-core/src/demuxers/mod.rs
+++ b/nihav-core/src/demuxers/mod.rs
@@ -203,6 +203,7 @@ pub struct SeekIndexResult {
 pub struct SeekIndex {
     pub seek_info:  Vec<StreamSeekInfo>,
     pub mode:       SeekIndexMode,
+    pub skip_index: bool,
 }
 
 impl SeekIndex {
@@ -307,6 +308,9 @@ impl<'a> Demuxer<'a> {
         }
     }
     pub fn seek(&mut self, time: u64) -> DemuxerResult<()> {
+        if self.seek_idx.skip_index {
+            return Err(DemuxerError::NotPossible);
+        }
         self.dmx.seek(time, &self.seek_idx)
     }
     pub fn get_seek_index(&self) -> &SeekIndex {
diff --git a/nihav-realmedia/src/demuxers/realmedia.rs b/nihav-realmedia/src/demuxers/realmedia.rs
index e3d7447..fa3920a 100644
--- a/nihav-realmedia/src/demuxers/realmedia.rs
+++ b/nihav-realmedia/src/demuxers/realmedia.rs
@@ -1060,7 +1060,11 @@ impl<'a> RealMediaDemuxer<'a> {
         else if id == mktag!(b"DATA") {
             self.data_chunks.push((self.src.tell() - 10, size, ver));
         }
-        else if id == mktag!(b"INDX") { self.parse_index(seek_idx, (size as usize) - 10, ver)?; }
+        else if id == mktag!(b"INDX") {
+            if !seek_idx.skip_index {
+                self.parse_index(seek_idx, (size as usize) - 10, ver)?;
+            }
+        }
         else if id == 0               { return Ok(true); }
         else                          { println!("unknown chunk type {:08X}", id); }
 
-- 
2.30.2