mpv/video/out/hwdec/hwdec_drmprime.c

320 lines
10 KiB
C

/*
* 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/>.
*/
#include <fcntl.h>
#include <stddef.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include <libavutil/hwcontext.h>
#include <libavutil/hwcontext_drm.h>
#include <libavutil/pixdesc.h>
#include <xf86drm.h>
#include "config.h"
#include "libmpv/render_gl.h"
#include "options/m_config.h"
#include "video/fmt-conversion.h"
#include "video/out/drm_common.h"
#include "video/out/gpu/hwdec.h"
#include "video/out/hwdec/dmabuf_interop.h"
extern const struct m_sub_options drm_conf;
struct priv_owner {
struct mp_hwdec_ctx hwctx;
int *formats;
struct dmabuf_interop dmabuf_interop;
};
static void uninit(struct ra_hwdec *hw)
{
struct priv_owner *p = hw->priv;
if (p->hwctx.driver_name)
hwdec_devices_remove(hw->devs, &p->hwctx);
av_buffer_unref(&p->hwctx.av_device_ref);
}
static const dmabuf_interop_init interop_inits[] = {
#if HAVE_DMABUF_INTEROP_GL
dmabuf_interop_gl_init,
#endif
#if HAVE_VAAPI
dmabuf_interop_pl_init,
#endif
#if HAVE_DMABUF_WAYLAND
dmabuf_interop_wl_init,
#endif
NULL
};
/**
* Due to the fact that Raspberry Pi support only exists in forked ffmpegs and
* also requires custom pixel formats, we need some way to work with those formats
* without introducing any build time dependencies. We do this by looking up the
* pixel formats by name. As rpi is an important target platform for this hwdec
* we don't really have the luxury of ignoring these forks.
*/
static const char *forked_pix_fmt_names[] = {
"rpi4_8",
"rpi4_10",
};
static int init(struct ra_hwdec *hw)
{
struct priv_owner *p = hw->priv;
for (int i = 0; interop_inits[i]; i++) {
if (interop_inits[i](hw, &p->dmabuf_interop)) {
break;
}
}
if (!p->dmabuf_interop.interop_map || !p->dmabuf_interop.interop_unmap) {
MP_VERBOSE(hw, "drmprime hwdec requires at least one dmabuf interop backend.\n");
return -1;
}
/*
* The drm_params resource is not provided when using X11 or Wayland, but
* there are extensions that supposedly provide this information from the
* drivers. Not properly documented. Of course.
*/
mpv_opengl_drm_params_v2 *params = ra_get_native_resource(hw->ra_ctx->ra,
"drm_params_v2");
/*
* Respect drm_device option, so there is a way to control this when not
* using a DRM gpu context. If drm_params_v2 are present, they will already
* respect this option.
*/
void *tmp = talloc_new(NULL);
struct drm_opts *drm_opts = mp_get_config_group(tmp, hw->global, &drm_conf);
const char *opt_path = drm_opts->device_path;
const char *device_path = params && params->render_fd > -1 ?
drmGetRenderDeviceNameFromFd(params->render_fd) :
opt_path ? opt_path : "/dev/dri/renderD128";
MP_VERBOSE(hw, "Using DRM device: %s\n", device_path);
int ret = av_hwdevice_ctx_create(&p->hwctx.av_device_ref,
AV_HWDEVICE_TYPE_DRM,
device_path, NULL, 0);
talloc_free(tmp);
if (ret != 0) {
MP_VERBOSE(hw, "Failed to create hwdevice_ctx: %s\n", av_err2str(ret));
return -1;
}
/*
* At the moment, there is no way to discover compatible formats
* from the hwdevice_ctx, and in fact the ffmpeg hwaccels hard-code
* formats too, so we're not missing out on anything.
*/
int num_formats = 0;
MP_TARRAY_APPEND(p, p->formats, num_formats, IMGFMT_NV12);
MP_TARRAY_APPEND(p, p->formats, num_formats, IMGFMT_420P);
MP_TARRAY_APPEND(p, p->formats, num_formats, pixfmt2imgfmt(AV_PIX_FMT_NV16));
MP_TARRAY_APPEND(p, p->formats, num_formats, IMGFMT_P010);
#ifdef AV_PIX_FMT_P210
MP_TARRAY_APPEND(p, p->formats, num_formats, pixfmt2imgfmt(AV_PIX_FMT_P210));
#endif
for (int i = 0; i < MP_ARRAY_SIZE(forked_pix_fmt_names); i++) {
enum AVPixelFormat fmt = av_get_pix_fmt(forked_pix_fmt_names[i]);
if (fmt != AV_PIX_FMT_NONE) {
MP_TARRAY_APPEND(p, p->formats, num_formats, pixfmt2imgfmt(fmt));
}
}
MP_TARRAY_APPEND(p, p->formats, num_formats, 0); // terminate it
p->hwctx.hw_imgfmt = IMGFMT_DRMPRIME;
p->hwctx.supported_formats = p->formats;
p->hwctx.driver_name = hw->driver->name;
hwdec_devices_add(hw->devs, &p->hwctx);
return 0;
}
static void mapper_unmap(struct ra_hwdec_mapper *mapper)
{
struct priv_owner *p_owner = mapper->owner->priv;
struct dmabuf_interop_priv *p = mapper->priv;
p_owner->dmabuf_interop.interop_unmap(mapper);
if (p->surface_acquired) {
for (int n = 0; n < p->desc.nb_objects; n++) {
if (p->desc.objects[n].fd > -1)
close(p->desc.objects[n].fd);
}
p->surface_acquired = false;
}
}
static void mapper_uninit(struct ra_hwdec_mapper *mapper)
{
struct priv_owner *p_owner = mapper->owner->priv;
if (p_owner->dmabuf_interop.interop_uninit) {
p_owner->dmabuf_interop.interop_uninit(mapper);
}
}
static bool check_fmt(struct ra_hwdec_mapper *mapper, int fmt)
{
struct priv_owner *p_owner = mapper->owner->priv;
for (int n = 0; p_owner->formats && p_owner->formats[n]; n++) {
if (p_owner->formats[n] == fmt)
return true;
}
return false;
}
static int mapper_init(struct ra_hwdec_mapper *mapper)
{
struct priv_owner *p_owner = mapper->owner->priv;
struct dmabuf_interop_priv *p = mapper->priv;
mapper->dst_params = mapper->src_params;
/*
* rpi4_8 and rpi4_10 function identically to NV12. These two pixel
* formats however are not defined in upstream ffmpeg so a string
* comparison is used to identify them instead of a mpv IMGFMT.
*/
const char* fmt_name = mp_imgfmt_to_name(mapper->src_params.hw_subfmt);
if (strcmp(fmt_name, "rpi4_8") == 0 || strcmp(fmt_name, "rpi4_10") == 0)
mapper->dst_params.imgfmt = IMGFMT_NV12;
else
mapper->dst_params.imgfmt = mapper->src_params.hw_subfmt;
mapper->dst_params.hw_subfmt = 0;
struct ra_imgfmt_desc desc = {0};
if (mapper->ra->num_formats &&
!ra_get_imgfmt_desc(mapper->ra, mapper->dst_params.imgfmt, &desc))
return -1;
p->num_planes = desc.num_planes;
mp_image_set_params(&p->layout, &mapper->dst_params);
if (p_owner->dmabuf_interop.interop_init)
if (!p_owner->dmabuf_interop.interop_init(mapper, &desc))
return -1;
if (!check_fmt(mapper, mapper->dst_params.imgfmt))
{
MP_FATAL(mapper, "unsupported DRM image format %s\n",
mp_imgfmt_to_name(mapper->dst_params.imgfmt));
return -1;
}
return 0;
}
static int mapper_map(struct ra_hwdec_mapper *mapper)
{
struct priv_owner *p_owner = mapper->owner->priv;
struct dmabuf_interop_priv *p = mapper->priv;
/*
* Although we use the same AVDRMFrameDescriptor to hold the dmabuf
* properties, we additionally need to dup the fds to ensure the
* frame doesn't disappear out from under us. And then for clarity,
* we copy all the individual fields.
*/
const AVDRMFrameDescriptor *desc = (AVDRMFrameDescriptor *)mapper->src->planes[0];
p->desc.nb_layers = desc->nb_layers;
p->desc.nb_objects = desc->nb_objects;
for (int i = 0; i < desc->nb_layers; i++) {
p->desc.layers[i].format = desc->layers[i].format;
p->desc.layers[i].nb_planes = desc->layers[i].nb_planes;
for (int j = 0; j < desc->layers[i].nb_planes; j++) {
p->desc.layers[i].planes[j].object_index = desc->layers[i].planes[j].object_index;
p->desc.layers[i].planes[j].offset = desc->layers[i].planes[j].offset;
p->desc.layers[i].planes[j].pitch = desc->layers[i].planes[j].pitch;
}
}
for (int i = 0; i < desc->nb_objects; i++) {
p->desc.objects[i].format_modifier = desc->objects[i].format_modifier;
p->desc.objects[i].size = desc->objects[i].size;
// Initialise fds to -1 to make partial failure cleanup easier.
p->desc.objects[i].fd = -1;
}
// Surface is now safe to treat as acquired to allow for unmapping to run.
p->surface_acquired = true;
// Now actually dup the fds
for (int i = 0; i < desc->nb_objects; i++) {
p->desc.objects[i].fd = fcntl(desc->objects[i].fd, F_DUPFD_CLOEXEC, 0);
if (p->desc.objects[i].fd == -1) {
MP_ERR(mapper, "Failed to duplicate dmabuf fd: %s\n",
mp_strerror(errno));
goto err;
}
}
// We can handle composed formats if the total number of planes is still
// equal the number of planes we expect. Complex formats with auxiliary
// planes cannot be supported.
int num_returned_planes = 0;
for (int i = 0; i < p->desc.nb_layers; i++) {
num_returned_planes += p->desc.layers[i].nb_planes;
}
if (p->num_planes != 0 && p->num_planes != num_returned_planes) {
MP_ERR(mapper,
"Mapped surface with format '%s' has unexpected number of planes. "
"(%d layers and %d planes, but expected %d planes)\n",
mp_imgfmt_to_name(mapper->src->params.hw_subfmt),
p->desc.nb_layers, num_returned_planes, p->num_planes);
goto err;
}
if (!p_owner->dmabuf_interop.interop_map(mapper, &p_owner->dmabuf_interop,
false))
goto err;
return 0;
err:
mapper_unmap(mapper);
MP_FATAL(mapper, "mapping DRM dmabuf failed\n");
return -1;
}
const struct ra_hwdec_driver ra_hwdec_drmprime = {
.name = "drmprime",
.priv_size = sizeof(struct priv_owner),
.imgfmts = {IMGFMT_DRMPRIME, 0},
.init = init,
.uninit = uninit,
.mapper = &(const struct ra_hwdec_mapper_driver){
.priv_size = sizeof(struct dmabuf_interop_priv),
.init = mapper_init,
.uninit = mapper_uninit,
.map = mapper_map,
.unmap = mapper_unmap,
},
};