mpv/video/out/opengl/hwdec_cuda.c

344 lines
9.3 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
* 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 'cuvid' decoder (aka NvDecode).
*
* For now, cuvid/NvDecode will always return images in NV12 format, even
* when decoding 10bit streams (there is some hardware dithering going on).
*/
#include "cuda_dynamic.h"
#include <libavutil/hwcontext.h>
#include <libavutil/hwcontext_cuda.h>
#include "formats.h"
#include "hwdec.h"
#include "options/m_config.h"
#include "ra_gl.h"
#include "video.h"
struct priv_owner {
struct mp_hwdec_ctx hwctx;
CUcontext display_ctx;
CUcontext decode_ctx;
};
struct priv {
struct mp_image layout;
CUgraphicsResource cu_res[4];
CUarray cu_array[4];
CUcontext display_ctx;
};
static int check_cu(struct ra_hwdec *hw, CUresult err, const char *func)
{
const char *err_name;
const char *err_string;
MP_TRACE(hw, "Calling %s\n", func);
if (err == CUDA_SUCCESS)
return 0;
cuGetErrorName(err, &err_name);
cuGetErrorString(err, &err_string);
MP_ERR(hw, "%s failed", func);
if (err_name && err_string)
MP_ERR(hw, " -> %s: %s", err_name, err_string);
MP_ERR(hw, "\n");
return -1;
}
#define CHECK_CU(x) check_cu(hw, (x), #x)
static int cuda_init(struct ra_hwdec *hw)
{
CUdevice display_dev;
AVBufferRef *hw_device_ctx = NULL;
CUcontext dummy;
unsigned int device_count;
int ret = 0;
struct priv_owner *p = hw->priv;
if (!ra_is_gl(hw->ra))
return -1;
GL *gl = ra_gl_get(hw->ra);
if (gl->version < 210 && gl->es < 300) {
MP_VERBOSE(hw, "need OpenGL >= 2.1 or OpenGL-ES >= 3.0\n");
return -1;
}
bool loaded = cuda_load();
if (!loaded) {
MP_VERBOSE(hw, "Failed to load CUDA symbols\n");
return -1;
}
ret = CHECK_CU(cuInit(0));
if (ret < 0)
goto error;
// Allocate display context
ret = CHECK_CU(cuGLGetDevices(&device_count, &display_dev, 1,
CU_GL_DEVICE_LIST_ALL));
if (ret < 0)
goto error;
ret = CHECK_CU(cuCtxCreate(&p->display_ctx, CU_CTX_SCHED_BLOCKING_SYNC,
display_dev));
if (ret < 0)
goto error;
p->decode_ctx = p->display_ctx;
int decode_dev_idx = -1;
mp_read_option_raw(hw->global, "cuda-decode-device", &m_option_type_choice,
&decode_dev_idx);
if (decode_dev_idx > -1) {
CUdevice decode_dev;
ret = CHECK_CU(cuDeviceGet(&decode_dev, decode_dev_idx));
if (ret < 0)
goto error;
if (decode_dev != display_dev) {
MP_INFO(hw, "Using separate decoder and display devices\n");
// Pop the display context. We won't use it again during init()
ret = CHECK_CU(cuCtxPopCurrent(&dummy));
if (ret < 0)
goto error;
ret = CHECK_CU(cuCtxCreate(&p->decode_ctx, CU_CTX_SCHED_BLOCKING_SYNC,
decode_dev));
if (ret < 0)
goto error;
}
}
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_ERR(hw, "av_hwdevice_ctx_init failed\n");
goto error;
}
ret = CHECK_CU(cuCtxPopCurrent(&dummy));
if (ret < 0)
goto error;
p->hwctx = (struct mp_hwdec_ctx) {
.type = HWDEC_CUDA,
.ctx = p->decode_ctx,
.av_device_ref = hw_device_ctx,
};
p->hwctx.driver_name = hw->driver->name;
hwdec_devices_add(hw->devs, &p->hwctx);
return 0;
error:
av_buffer_unref(&hw_device_ctx);
CHECK_CU(cuCtxPopCurrent(&dummy));
return -1;
}
static void cuda_uninit(struct ra_hwdec *hw)
{
struct priv_owner *p = hw->priv;
if (p->hwctx.ctx)
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(cuCtxDestroy(p->decode_ctx));
if (p->display_ctx)
CHECK_CU(cuCtxDestroy(p->display_ctx));
}
#undef CHECK_CU
#define CHECK_CU(x) check_cu((mapper)->owner, (x), #x)
static int mapper_init(struct ra_hwdec_mapper *mapper)
{
struct priv_owner *p_owner = mapper->owner->priv;
struct priv *p = mapper->priv;
CUcontext dummy;
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(cuCtxPushCurrent(p->display_ctx));
if (ret < 0)
return ret;
for (int n = 0; n < desc.num_planes; n++) {
const struct ra_format *format = desc.planes[n];
struct ra_tex_params params = {
.dimensions = 2,
.w = mp_image_plane_w(&p->layout, n),
.h = mp_image_plane_h(&p->layout, n),
.d = 1,
.format = format,
.render_src = true,
.src_linear = format->linear_filter,
};
mapper->tex[n] = ra_tex_create(mapper->ra, &params);
if (!mapper->tex[n]) {
ret = -1;
goto error;
}
GLuint texture;
GLenum target;
ra_gl_get_raw_tex(mapper->ra, mapper->tex[n], &texture, &target);
ret = CHECK_CU(cuGraphicsGLRegisterImage(&p->cu_res[n], texture, target,
CU_GRAPHICS_REGISTER_FLAGS_WRITE_DISCARD));
if (ret < 0)
goto error;
ret = CHECK_CU(cuGraphicsMapResources(1, &p->cu_res[n], 0));
if (ret < 0)
goto error;
ret = CHECK_CU(cuGraphicsSubResourceGetMappedArray(&p->cu_array[n], p->cu_res[n],
0, 0));
if (ret < 0)
goto error;
ret = CHECK_CU(cuGraphicsUnmapResources(1, &p->cu_res[n], 0));
if (ret < 0)
goto error;
}
error:
eret = CHECK_CU(cuCtxPopCurrent(&dummy));
if (eret < 0)
return eret;
return ret;
}
static void mapper_uninit(struct ra_hwdec_mapper *mapper)
{
struct priv *p = mapper->priv;
CUcontext dummy;
// Don't bail if any CUDA calls fail. This is all best effort.
CHECK_CU(cuCtxPushCurrent(p->display_ctx));
for (int n = 0; n < 4; n++) {
if (p->cu_res[n] > 0)
CHECK_CU(cuGraphicsUnregisterResource(p->cu_res[n]));
p->cu_res[n] = 0;
ra_tex_free(mapper->ra, &mapper->tex[n]);
}
CHECK_CU(cuCtxPopCurrent(&dummy));
}
static void mapper_unmap(struct ra_hwdec_mapper *mapper)
{
}
static int mapper_map(struct ra_hwdec_mapper *mapper)
{
struct priv *p = mapper->priv;
CUcontext dummy;
int ret = 0, eret = 0;
ret = CHECK_CU(cuCtxPushCurrent(p->display_ctx));
if (ret < 0)
return ret;
for (int n = 0; n < p->layout.num_planes; n++) {
CUDA_MEMCPY2D cpy = {
.srcMemoryType = CU_MEMORYTYPE_DEVICE,
.dstMemoryType = CU_MEMORYTYPE_ARRAY,
.srcDevice = (CUdeviceptr)mapper->src->planes[n],
.srcPitch = mapper->src->stride[n],
.srcY = 0,
.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(cuMemcpy2D(&cpy));
if (ret < 0)
goto error;
}
error:
eret = CHECK_CU(cuCtxPopCurrent(&dummy));
if (eret < 0)
return eret;
return ret;
}
const struct ra_hwdec_driver ra_hwdec_cuda = {
.name = "cuda",
.api = HWDEC_CUDA,
.imgfmts = {IMGFMT_CUDA, 0},
.priv_size = sizeof(struct priv_owner),
.init = cuda_init,
.uninit = cuda_uninit,
.mapper = &(const struct ra_hwdec_mapper_driver){
.priv_size = sizeof(struct priv),
.init = mapper_init,
.uninit = mapper_uninit,
.map = mapper_map,
.unmap = mapper_unmap,
},
};