mpv/video/out/hwdec/hwdec_cuda.c

298 lines
8.2 KiB
C

/*
* Copyright (c) 2016 Philip Langdale <philipl@overt.org>
*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* This hwdec implements an optimized output path using CUDA->OpenGL
* or CUDA->Vulkan interop for frame data that is stored in CUDA
* device memory. Although it is not explicit in the code here, the
* only practical way to get data in this form is from the
* nvdec/cuvid decoder.
*/
#include "config.h"
#include "hwdec_cuda.h"
#include <libavutil/hwcontext.h>
#include <libavutil/hwcontext_cuda.h>
int check_cu(const struct ra_hwdec *hw, CUresult err, const char *func)
{
const char *err_name;
const char *err_string;
struct cuda_hw_priv *p = hw->priv;
int level = hw->probing ? MSGL_V : MSGL_ERR;
MP_TRACE(hw, "Calling %s\n", func);
if (err == CUDA_SUCCESS)
return 0;
p->cu->cuGetErrorName(err, &err_name);
p->cu->cuGetErrorString(err, &err_string);
MP_MSG(hw, level, "%s failed", func);
if (err_name && err_string)
MP_MSG(hw, level, " -> %s: %s", err_name, err_string);
MP_MSG(hw, level, "\n");
return -1;
}
#define CHECK_CU(x) check_cu(hw, (x), #x)
static const struct cuda_interop_fn *interop_fns[] = {
#if HAVE_GL
&cuda_gl_fn,
#endif
#if HAVE_VULKAN
&cuda_vk_fn,
#endif
NULL
};
static int cuda_init(struct ra_hwdec *hw)
{
AVBufferRef *hw_device_ctx = NULL;
CUcontext dummy;
int ret = 0;
struct cuda_hw_priv *p = hw->priv;
CudaFunctions *cu = NULL;
int level = hw->probing ? MSGL_V : MSGL_ERR;
bool initialized = false;
// Initialise CUDA context from backend.
// Note that the interop check doesn't require the CUDA backend to be initialized.
// This is important because cuInit wakes up the dgpu (even if the cuda hwdec won't be used!)
// Doing this allows us to check if CUDA should be used without waking up the dgpu, avoiding
// a few seconds of delay and improving battery life for laptops!
for (int i = 0; interop_fns[i]; i++) {
if (!interop_fns[i]->check(hw))
continue;
if (!initialized) {
ret = cuda_load_functions(&p->cu, NULL);
if (ret != 0) {
MP_MSG(hw, level, "Failed to load CUDA symbols\n");
return -1;
}
cu = p->cu;
ret = CHECK_CU(cu->cuInit(0));
if (ret < 0)
return -1;
initialized = true;
}
if (interop_fns[i]->init(hw))
break;
}
if (!p->ext_init || !p->ext_uninit) {
MP_MSG(hw, level,
"CUDA hwdec only works with OpenGL or Vulkan backends.\n");
return -1;
}
hw_device_ctx = av_hwdevice_ctx_alloc(AV_HWDEVICE_TYPE_CUDA);
if (!hw_device_ctx)
goto error;
AVHWDeviceContext *device_ctx = (void *)hw_device_ctx->data;
AVCUDADeviceContext *device_hwctx = device_ctx->hwctx;
device_hwctx->cuda_ctx = p->decode_ctx;
ret = av_hwdevice_ctx_init(hw_device_ctx);
if (ret < 0) {
MP_MSG(hw, level, "av_hwdevice_ctx_init failed\n");
goto error;
}
ret = CHECK_CU(cu->cuCtxPopCurrent(&dummy));
if (ret < 0)
goto error;
p->hwctx = (struct mp_hwdec_ctx) {
.driver_name = hw->driver->name,
.av_device_ref = hw_device_ctx,
.hw_imgfmt = IMGFMT_CUDA,
};
hwdec_devices_add(hw->devs, &p->hwctx);
return 0;
error:
av_buffer_unref(&hw_device_ctx);
CHECK_CU(cu->cuCtxPopCurrent(&dummy));
return -1;
}
static void cuda_uninit(struct ra_hwdec *hw)
{
struct cuda_hw_priv *p = hw->priv;
CudaFunctions *cu = p->cu;
hwdec_devices_remove(hw->devs, &p->hwctx);
av_buffer_unref(&p->hwctx.av_device_ref);
if (p->decode_ctx && p->decode_ctx != p->display_ctx)
CHECK_CU(cu->cuCtxDestroy(p->decode_ctx));
if (p->display_ctx)
CHECK_CU(cu->cuCtxDestroy(p->display_ctx));
cuda_free_functions(&p->cu);
}
#undef CHECK_CU
#define CHECK_CU(x) check_cu((mapper)->owner, (x), #x)
static int mapper_init(struct ra_hwdec_mapper *mapper)
{
struct cuda_hw_priv *p_owner = mapper->owner->priv;
struct cuda_mapper_priv *p = mapper->priv;
CUcontext dummy;
CudaFunctions *cu = p_owner->cu;
int ret = 0, eret = 0;
p->display_ctx = p_owner->display_ctx;
int imgfmt = mapper->src_params.hw_subfmt;
mapper->dst_params = mapper->src_params;
mapper->dst_params.imgfmt = imgfmt;
mapper->dst_params.hw_subfmt = 0;
mp_image_set_params(&p->layout, &mapper->dst_params);
struct ra_imgfmt_desc desc;
if (!ra_get_imgfmt_desc(mapper->ra, imgfmt, &desc)) {
MP_ERR(mapper, "Unsupported format: %s\n", mp_imgfmt_to_name(imgfmt));
return -1;
}
ret = CHECK_CU(cu->cuCtxPushCurrent(p->display_ctx));
if (ret < 0)
return ret;
for (int n = 0; n < desc.num_planes; n++) {
if (!p_owner->ext_init(mapper, desc.planes[n], n))
goto error;
}
error:
eret = CHECK_CU(cu->cuCtxPopCurrent(&dummy));
if (eret < 0)
return eret;
return ret;
}
static void mapper_uninit(struct ra_hwdec_mapper *mapper)
{
struct cuda_mapper_priv *p = mapper->priv;
struct cuda_hw_priv *p_owner = mapper->owner->priv;
CudaFunctions *cu = p_owner->cu;
CUcontext dummy;
// Don't bail if any CUDA calls fail. This is all best effort.
CHECK_CU(cu->cuCtxPushCurrent(p->display_ctx));
for (int n = 0; n < 4; n++) {
p_owner->ext_uninit(mapper, n);
ra_tex_free(mapper->ra, &mapper->tex[n]);
}
CHECK_CU(cu->cuCtxPopCurrent(&dummy));
}
static void mapper_unmap(struct ra_hwdec_mapper *mapper)
{
}
static int mapper_map(struct ra_hwdec_mapper *mapper)
{
struct cuda_mapper_priv *p = mapper->priv;
struct cuda_hw_priv *p_owner = mapper->owner->priv;
CudaFunctions *cu = p_owner->cu;
CUcontext dummy;
int ret = 0, eret = 0;
ret = CHECK_CU(cu->cuCtxPushCurrent(p->display_ctx));
if (ret < 0)
return ret;
for (int n = 0; n < p->layout.num_planes; n++) {
if (p_owner->ext_wait) {
if (!p_owner->ext_wait(mapper, n))
goto error;
}
CUDA_MEMCPY2D cpy = {
.srcMemoryType = CU_MEMORYTYPE_DEVICE,
.srcDevice = (CUdeviceptr)mapper->src->planes[n],
.srcPitch = mapper->src->stride[n],
.srcY = 0,
.dstMemoryType = CU_MEMORYTYPE_ARRAY,
.dstArray = p->cu_array[n],
.WidthInBytes = mp_image_plane_w(&p->layout, n) *
mapper->tex[n]->params.format->pixel_size,
.Height = mp_image_plane_h(&p->layout, n),
};
ret = CHECK_CU(cu->cuMemcpy2DAsync(&cpy, 0));
if (ret < 0)
goto error;
if (p_owner->ext_signal) {
if (!p_owner->ext_signal(mapper, n))
goto error;
}
}
if (p_owner->do_full_sync)
CHECK_CU(cu->cuStreamSynchronize(0));
// fall through
error:
// Regardless of success or failure, we no longer need the source image,
// because this hwdec makes an explicit memcpy into the mapper textures
mp_image_unrefp(&mapper->src);
eret = CHECK_CU(cu->cuCtxPopCurrent(&dummy));
if (eret < 0)
return eret;
return ret;
}
const struct ra_hwdec_driver ra_hwdec_cuda = {
.name = "cuda",
.imgfmts = {IMGFMT_CUDA, 0},
.priv_size = sizeof(struct cuda_hw_priv),
.init = cuda_init,
.uninit = cuda_uninit,
.mapper = &(const struct ra_hwdec_mapper_driver){
.priv_size = sizeof(struct cuda_mapper_priv),
.init = mapper_init,
.uninit = mapper_uninit,
.map = mapper_map,
.unmap = mapper_unmap,
},
};