From 6b77a10e43e1a8ed8ead20f344485d400440055c Mon Sep 17 00:00:00 2001
From: Philip Langdale
Date: Wed, 15 Nov 2017 20:59:29 -0800
Subject: avcodec: Implement mpeg4 nvdec hwaccel

This was predictably nightmarish, given how ridiculous mpeg4 is.
I had to stare at the cuvid parser output for a long time to work
out what each field was supposed to be, and even then, I still don't
fully understand some of them. Particularly:

vop_coded: If I'm reading the decoder correctly, this flag will always
           be 1 as the decoder will not pass the hwaccel any frame
           where it is not 1.
divx_flags: There's obviously no documentation on what the possible
            flags are. I simply observed that this is '0' for a
            normal bitstream and '5' for packed b-frames.
gmc_enabled: I had a number of guesses as to what this mapped to.
             I picked the condition I did based on when the cuvid
             parser was setting flag.

Also note that as with the vdpau hwaccel, the decoder needs to
consume the entire frame and not the slice.
---
 Changelog | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'Changelog')

diff --git a/Changelog b/Changelog
index 5a9d183aed..74ed35cfe6 100644
--- a/Changelog
+++ b/Changelog
@@ -13,7 +13,7 @@ version <next>:
 - PCE support for extended channel layouts in the AAC encoder
 - native aptX encoder and decoder
 - Raw aptX muxer and demuxer
-- NVIDIA NVDEC-accelerated H.264, HEVC, MPEG-1/2, VC1 and VP9 hwaccel decoding
+- NVIDIA NVDEC-accelerated H.264, HEVC, MPEG-1/2/4, VC1 and VP9 hwaccel decoding
 - Intel QSV-accelerated overlay filter
 - mcompand audio filter
 - acontrast audio filter
-- 
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