Handle negative data_offset in TrunBox (#15)

Wumpf · web-flow · commit 06e0d6f22a4f · 2024-11-12T12:06:29.000+01:00
diff --git a/src/reader.rs b/src/reader.rs
@@ -383,7 +383,8 @@ impl Mp4 {
 
                         let sample_offset = if traf_idx == 0 && sample_n == 0 {
                             if data_offset_present {
-                                base_data_offset + trun.data_offset.unwrap_or(0) as u64
+                                base_data_offset
+                                    .saturating_add_signed(trun.data_offset.unwrap_or(0) as i64)
                             } else {
                                 base_data_offset
                             }

Original file line number	Diff line number	Diff line change
`@@ -383,7 +383,8 @@ impl Mp4 {`
`383`	`383`
`384`	`384`	`let sample_offset = if traf_idx == 0 && sample_n == 0 {`
`385`	`385`	`if data_offset_present {`
`386`		`- base_data_offset + trun.data_offset.unwrap_or(0) as u64`
	`386`	`+ base_data_offset`
	`387`	`+ .saturating_add_signed(trun.data_offset.unwrap_or(0) as i64)`
`387`	`388`	`} else {`
`388`	`389`	`base_data_offset`
`389`	`390`	`}`