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dxva2: use optimized memcpy

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At least on my machine, reading back the frame with system memcpy is
slower than just using software rendering. Use the optimized gpu_memcpy
from LAV to speed things up.
This commit is contained in:
James Ross-Gowan 2014-10-26 10:43:15 +11:00 committed by wm4
parent f2d51171f7
commit 52b52800ce
3 changed files with 165 additions and 12 deletions
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2
DOCS/man/options.rst
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@ -492,7 +492,7 @@ Video
:vaapi: requires ``--vo=opengl`` or ``--vo=vaapi`` (Linux with Intel GPUs only)
:vaapi-copy: copies video back into system RAM (Linux with Intel GPUs only)
:vda: requires ``--vo=opengl`` (OS X only)
:dxva2-copy: copies video back to system RAM (win32 only) (doesn't work)
:dxva2-copy: copies video back to system RAM (Windows only) (experimental)
``auto`` tries to automatically enable hardware decoding using the first
available method. This still depends what VO you are using. For example,

46
video/decode/dxva2.c
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@ -41,6 +41,7 @@
#include "video/fmt-conversion.h"
#include "video/mp_image_pool.h"
#include "video/hwdec.h"
#include "gpu_memcpy_sse4.h"
// A minor evil.
#ifndef FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO
@ -98,6 +99,9 @@ typedef struct surface_info {
typedef struct DXVA2Context {
struct mp_log *log;
void (*copy_nv12)(struct mp_image *dest, uint8_t *src_bits,
unsigned src_pitch, unsigned surf_height);
HMODULE d3dlib;
HMODULE dxva2lib;
@ -241,6 +245,26 @@ static struct mp_image *dxva2_allocate_image(struct lavc_ctx *s, int fmt,
return mp_image_new_custom_ref(&mpi, w, dxva2_release_img);
}
static void copy_nv12_fallback(struct mp_image *dest, uint8_t *src_bits,
unsigned src_pitch, unsigned surf_height)
{
unsigned height = dest->h * src_pitch;
memcpy(dest->planes[0], src_bits, height);
dest->stride[0] = src_pitch;
memcpy(dest->planes[1], src_bits + src_pitch * surf_height, height / 2);
dest->stride[1] = src_pitch;
}
static void copy_nv12_gpu_sse4(struct mp_image *dest, uint8_t *src_bits,
unsigned src_pitch, unsigned surf_height)
{
unsigned height = dest->h * src_pitch;
gpu_memcpy(dest->planes[0], src_bits, height);
dest->stride[0] = src_pitch;
gpu_memcpy(dest->planes[1], src_bits + src_pitch * surf_height, height / 2);
dest->stride[1] = src_pitch;
}
static struct mp_image *dxva2_retrieve_image(struct lavc_ctx *s,
struct mp_image *img)
{
@ -265,17 +289,7 @@ static struct mp_image *dxva2_retrieve_image(struct lavc_ctx *s,
return img;
}
struct mp_image buf = {0};
mp_image_setfmt(&buf, IMGFMT_NV12);
mp_image_set_size(&buf, img->w, img->h);
buf.planes[0] = LockedRect.pBits;
buf.stride[0] = LockedRect.Pitch;
buf.planes[1] = (char *)LockedRect.pBits + LockedRect.Pitch * surfaceDesc.Height;
buf.stride[1] = LockedRect.Pitch;
// This should probably use some sort of "special" memcpy-like function.
mp_image_copy(sw_img, &buf);
ctx->copy_nv12(sw_img, LockedRect.pBits, LockedRect.Pitch, surfaceDesc.Height);
IDirect3DSurface9_UnlockRect(surface);
@ -302,6 +316,16 @@ static int dxva2_init(struct lavc_ctx *s)
ctx->log = mp_log_new(s, s->log, "dxva2");
ctx->sw_pool = talloc_steal(ctx, mp_image_pool_new(17));
if (av_get_cpu_flags() & AV_CPU_FLAG_SSE4) {
// Use a memcpy implementation optimised for copying from GPU memory
MP_DBG(ctx, "Using SSE4 memcpy\n");
ctx->copy_nv12 = copy_nv12_gpu_sse4;
} else {
// Use the CRT memcpy. This can be slower than software decoding.
MP_WARN(ctx, "Using fallback memcpy (slow)\n");
ctx->copy_nv12 = copy_nv12_fallback;
}
ctx->deviceHandle = INVALID_HANDLE_VALUE;
ctx->d3dlib = LoadLibrary("d3d9.dll");

129
video/decode/gpu_memcpy_sse4.h Normal file
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@ -0,0 +1,129 @@
/*
* Copyright (C) 2011-2014 Hendrik Leppkes
* http://www.1f0.de
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Taken from the QuickSync decoder by Eric Gur
*/
#include <emmintrin.h>
// gpu_memcpy is a memcpy style function that copied data very fast from a
// GPU tiled memory (write back)
// Performance tip: page offset (12 lsb) of both addresses should be different
// optimally use a 2K offset between them.
__attribute__((target("sse4"))) static inline void
*gpu_memcpy(void *restrict d, const void *restrict s, size_t size)
{
static const size_t regsInLoop = sizeof(size_t) * 2; // 8 or 16
if (d == NULL || s == NULL) return NULL;
// If memory is not aligned, use memcpy
bool isAligned = (((size_t)(s) | (size_t)(d)) & 0xF) == 0;
if (!isAligned)
{
return memcpy(d, s, size);
}
__m128i xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7;
#ifdef __x86_64__
__m128i xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15;
#endif
size_t reminder = size & (regsInLoop * sizeof(xmm0) - 1); // Copy 128 or 256 bytes every loop
size_t end = 0;
__m128i* pTrg = (__m128i*)d;
__m128i* pTrgEnd = pTrg + ((size - reminder) >> 4);
__m128i* pSrc = (__m128i*)s;
// Make sure source is synced - doesn't hurt if not needed.
_mm_sfence();
while (pTrg < pTrgEnd)
{
// _mm_stream_load_si128 emits the Streaming SIMD Extensions 4 (SSE4.1) instruction MOVNTDQA
// Fastest method for copying GPU RAM. Available since Penryn (45nm Core 2 Duo/Quad)
xmm0 = _mm_stream_load_si128(pSrc);
xmm1 = _mm_stream_load_si128(pSrc + 1);
xmm2 = _mm_stream_load_si128(pSrc + 2);
xmm3 = _mm_stream_load_si128(pSrc + 3);
xmm4 = _mm_stream_load_si128(pSrc + 4);
xmm5 = _mm_stream_load_si128(pSrc + 5);
xmm6 = _mm_stream_load_si128(pSrc + 6);
xmm7 = _mm_stream_load_si128(pSrc + 7);
#ifdef __x86_64__ // Use all 16 xmm registers
xmm8 = _mm_stream_load_si128(pSrc + 8);
xmm9 = _mm_stream_load_si128(pSrc + 9);
xmm10 = _mm_stream_load_si128(pSrc + 10);
xmm11 = _mm_stream_load_si128(pSrc + 11);
xmm12 = _mm_stream_load_si128(pSrc + 12);
xmm13 = _mm_stream_load_si128(pSrc + 13);
xmm14 = _mm_stream_load_si128(pSrc + 14);
xmm15 = _mm_stream_load_si128(pSrc + 15);
#endif
pSrc += regsInLoop;
// _mm_store_si128 emit the SSE2 intruction MOVDQA (aligned store)
_mm_store_si128(pTrg , xmm0);
_mm_store_si128(pTrg + 1, xmm1);
_mm_store_si128(pTrg + 2, xmm2);
_mm_store_si128(pTrg + 3, xmm3);
_mm_store_si128(pTrg + 4, xmm4);
_mm_store_si128(pTrg + 5, xmm5);
_mm_store_si128(pTrg + 6, xmm6);
_mm_store_si128(pTrg + 7, xmm7);
#ifdef __x86_64__ // Use all 16 xmm registers
_mm_store_si128(pTrg + 8, xmm8);
_mm_store_si128(pTrg + 9, xmm9);
_mm_store_si128(pTrg + 10, xmm10);
_mm_store_si128(pTrg + 11, xmm11);
_mm_store_si128(pTrg + 12, xmm12);
_mm_store_si128(pTrg + 13, xmm13);
_mm_store_si128(pTrg + 14, xmm14);
_mm_store_si128(pTrg + 15, xmm15);
#endif
pTrg += regsInLoop;
}
// Copy in 16 byte steps
if (reminder >= 16)
{
size = reminder;
reminder = size & 15;
end = size >> 4;
for (size_t i = 0; i < end; ++i)
{
pTrg[i] = _mm_stream_load_si128(pSrc + i);
}
}
// Copy last bytes - shouldn't happen as strides are modulu 16
if (reminder)
{
__m128i temp = _mm_stream_load_si128(pSrc + end);
char* ps = (char*)(&temp);
char* pt = (char*)(pTrg + end);
for (size_t i = 0; i < reminder; ++i)
{
pt[i] = ps[i];
}
}
return d;
}