Attachment 114178 Details for Bug 89507 – gen7_mfd: Optimise the scan code search

[patch] gen7_mfd: Optimise the scan code search

0001-gen7_mfd-Optimise-start-code-search.patch (text/plain), 1.52 KB, created by Olivier Crête on 2015-03-09 22:27:56 UTC

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Creator: Olivier Crête

Created: 2015-03-09 22:27:56 UTC

Size: 1.52 KB

patch

obsolete

>From 3538c4fa9c078e43c911e637aa898346584889a9 Mon Sep 17 00:00:00 2001
>From: Olivier Crete <olivier.crete@collabora.com>
>Date: Mon, 9 Mar 2015 18:20:34 -0400
>Subject: [PATCH] gen7_mfd: Optimise start code search
>
>Code inspired from GStreamer
>---
> src/gen7_mfd.c | 26 +++++++++++++++++---------
> 1 file changed, 17 insertions(+), 9 deletions(-)
>
>diff --git a/src/gen7_mfd.c b/src/gen7_mfd.c
>index d166052..4439c3c 100755
>--- a/src/gen7_mfd.c
>+++ b/src/gen7_mfd.c
>@@ -1043,21 +1043,29 @@ uint32_t mpeg2_get_slice_data_length(dri_bo *slice_data_bo, VASliceParameterBuff
>     uint8_t *buf;
>     uint32_t buf_offset = slice_param->slice_data_offset + (slice_param->macroblock_offset >> 3);
>     uint32_t buf_size = slice_param->slice_data_size - (slice_param->macroblock_offset >> 3);
>-    uint32_t i;
>+    uint32_t i = 0;
> 
>     dri_bo_map(slice_data_bo, 0);
>     buf = (uint8_t *)slice_data_bo->virtual + buf_offset;
> 
>-    for (i = 3; i < buf_size; i++) {
>-        if (buf[i - 3] &&
>-            !buf[i - 2] &&
>-            !buf[i - 1] &&
>-            !buf[i]) {
>-            dri_bo_unmap(slice_data_bo);
>-            return i - 3 + 1;
>-        }
>+    if (buf_size < 4)
>+      return buf_size;
>+
>+    while (i <= (buf_size - 4)) {
>+      if (buf[i + 2] > 1) {
>+        i += 3;
>+      } else if (buf[i + 1]) {
>+        i += 2;
>+      } else if (buf[i] || buf[i + 2] != 1) {
>+        i++;
>+      } else {
>+        break;
>+      }
>     }
> 
>+    if (i <= (buf_size - 4))
>+      buf_size = i;
>+
>     dri_bo_unmap(slice_data_bo);
>     return buf_size;
> }
>-- 
>1.9.1
>

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