On Fri, Aug 17, 2018 at 11:34 AM Gagandeep Singh <deepgagan231...@gmail.com>
wrote:
>
>
> On Thu, Aug 16, 2018 at 2:37 AM Kieran Kunhya <kier...@obe.tv> wrote:
>
>> On Tue, 14 Aug 2018 at 08:43 Gagandeep Singh <deepgagan231...@gmail.com>
>> wrote:
>>
>> > Second patch for fixing decompanding in table 9.
>> >
>> > Gagandeep Singh
>> >
>>
>> Seems ok
>>
>> Kieran
>>
>
> Thanks!!
>
> Gagandeep Singh
>
Hi,
This patch is to be applied along with the other updated patches.
Thanks
Gagandeep Singh
> _______________________________________________
>> ffmpeg-devel mailing list
>> ffmpeg-devel@ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
>
From 4f0c812aaf50738e579bde0bb12b9f2391eb15e5 Mon Sep 17 00:00:00 2001
From: Gagandeep Singh <deepgagan231...@gmail.com>
Date: Thu, 6 Sep 2018 11:12:16 +0530
Subject: [GSOC][PATCH 2/3] lavc/cfhd: correct decompanding for old codebook (table 9)
---
libavcodec/cfhd.c | 25 ++++++++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/libavcodec/cfhd.c b/libavcodec/cfhd.c
index 3929b54f31..e78fa81655 100644
--- a/libavcodec/cfhd.c
+++ b/libavcodec/cfhd.c
@@ -114,7 +114,30 @@ static inline int dequant_and_decompand(int level, int quantisation, int codeboo
{
if (lossless)
return level;
- if (codebook == 0 || codebook == 1) {
+ if (codebook == 0) {
+ if (level >= 40 && level < 264) {
+ if (level >= 54) {
+ level -= 54;
+ level <<= 2;
+ level += 54;
+ }
+ level -= 40;
+ level <<= 2;
+ level += 40;
+ } else if (level <= -40) {
+ level = -level;
+ if (level >= 54) {
+ level -= 54;
+ level <<= 2;
+ level += 54;
+ }
+ level -= 40;
+ level <<= 2;
+ level += 40;
+ level = -level;
+ }
+ return level * quantisation;
+ } else if (codebook == 1) {
int64_t abslevel = abs(level);
if (level < 264)
return (abslevel + ((768 * abslevel * abslevel * abslevel) / (255 * 255 * 255))) *
--
2.17.1
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
