[x265] [PATCH] level: allow unbounded level 8.5 to be used for lossless encodes

[Steve Borho]

# HG changeset patch
# User Steve Borho <steve at borho.org>
# Date 1428372156 18000
#      Mon Apr 06 21:02:36 2015 -0500
# Node ID 0ce13ce29304296b9684668e628ae09f9ee8aed0
# Parent  e35d7fe9e97451c07e7225311c0b34ad51ad5299
level: allow unbounded level 8.5 to be used for lossless encodes

Lossless has no rate control, obviously, so it does not generally fit in any of
the given levels but I think it is better to signal a valid profile (main,
main10, main10 4:4:4, etc) together with level 8.5 than to signal profile and
level as NONE. If anyone knows a better solution for this, please enlighten me.

This workaround prevents the need for --allow-non-conformance with --lossless

diff -r e35d7fe9e974 -r 0ce13ce29304 source/common/slice.h
--- a/source/common/slice.h	Mon Apr 06 15:39:24 2015 -0700
+++ b/source/common/slice.h	Mon Apr 06 21:02:36 2015 -0500
@@ -98,6 +98,7 @@
         LEVEL6 = 180,
         LEVEL6_1 = 183,
         LEVEL6_2 = 186,
+        LEVEL8_5 = 255,
     };
 }
 
diff -r e35d7fe9e974 -r 0ce13ce29304 source/encoder/level.cpp
--- a/source/encoder/level.cpp	Mon Apr 06 15:39:24 2015 -0700
+++ b/source/encoder/level.cpp	Mon Apr 06 21:02:36 2015 -0500
@@ -55,15 +55,14 @@
     { 35651584, 1069547520, 60000,    240000,   60000,  240000,   8, Level::LEVEL6,   "6",   60 },
     { 35651584, 2139095040, 120000,   480000,   120000, 480000,   8, Level::LEVEL6_1, "6.1", 61 },
     { 35651584, 4278190080U, 240000,  800000,   240000, 800000,   6, Level::LEVEL6_2, "6.2", 62 },
+    { MAX_UINT, MAX_UINT, MAX_UINT, MAX_UINT, MAX_UINT, MAX_UINT, 1, Level::LEVEL8_5, "8.5", 85 },
 };
 
 /* determine minimum decoder level required to decode the described video */
 void determineLevel(const x265_param &param, VPS& vps)
 {
     vps.maxTempSubLayers = param.bEnableTemporalSubLayers ? 2 : 1;
-    if (param.bLossless)
-        vps.ptl.profileIdc = Profile::NONE;
-    else if (param.internalCsp == X265_CSP_I420)
+    if (param.internalCsp == X265_CSP_I420)
     {
         if (param.internalBitDepth == 8)
         {
@@ -104,7 +103,15 @@
 
     const size_t NumLevels = sizeof(levels) / sizeof(levels[0]);
     uint32_t i;
-    for (i = 0; i < NumLevels; i++)
+    if (param.bLossless)
+    {
+        i = 13;
+        vps.ptl.minCrForLevel = 1;
+        vps.ptl.maxLumaSrForLevel = MAX_UINT;
+        vps.ptl.levelIdc = Level::LEVEL8_5;
+        vps.ptl.tierFlag = Level::MAIN;
+    }
+    else for (i = 0; i < NumLevels; i++)
     {
         if (lumaSamples > levels[i].maxLumaSamples)
             continue;