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gallium/util: get h264 level based on number of max references and resolution 

v2: add commments for limitation of max references numbers,
and what the caculation is based

Signed-off-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Leo Liu 2015-03-12 14:01:52 -04:00 committed by Marek Olšák
parent 6d05396b00
commit 4509fc8b94
1 changed files with 36 additions and 0 deletions
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36
src/gallium/auxiliary/util/u_video.h
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@ -38,6 +38,7 @@ extern "C" {
/* u_reduce_video_profile() needs these */
#include "pipe/p_compiler.h"
#include "util/u_debug.h"
#include "util/u_math.h"
static INLINE enum pipe_video_format
u_reduce_video_profile(enum pipe_video_profile profile)
@ -146,6 +147,41 @@ u_copy_swap422_packed(void *const *destination_data,
}
}
static INLINE uint32_t
u_get_h264_level(uint32_t width, uint32_t height, uint32_t *max_reference)
{
uint32_t max_dpb_mbs;
width = align(width, 16);
height = align(height, 16);
/* Max references will be used for caculation of number of DPB buffers
in the UVD driver, limitation of max references is 16. Some client
like mpv application for VA-API, it requires references more than that,
so we have to set max of references to 16 here. */
*max_reference = MIN2(*max_reference, 16);
max_dpb_mbs = (width / 16) * (height / 16) * *max_reference;
/* The calculation is based on "Decoded picture buffering" section
from http://en.wikipedia.org/wiki/H.264/MPEG-4_AVC */
if (max_dpb_mbs <= 8100)
return 30;
else if (max_dpb_mbs <= 18000)
return 31;
else if (max_dpb_mbs <= 20480)
return 32;
else if (max_dpb_mbs <= 32768)
return 41;
else if (max_dpb_mbs <= 34816)
return 42;
else if (max_dpb_mbs <= 110400)
return 50;
else if (max_dpb_mbs <= 184320)
return 51;
else
return 52;
}
#ifdef __cplusplus
}
#endif