ffmpeg/libavutil/hwcontext_drm.c

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/*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
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#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
/* This was introduced in version 4.6. And may not exist all without an
* optional package. So to prevent a hard dependency on needing the Linux
* kernel headers to compile, make this optional. */
#if HAVE_LINUX_DMA_BUF_H
#include <linux/dma-buf.h>
#include <sys/ioctl.h>
#endif
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#include <drm.h>
#include <xf86drm.h>
#include "avassert.h"
#include "hwcontext.h"
#include "hwcontext_drm.h"
#include "hwcontext_internal.h"
#include "imgutils.h"
static void drm_device_free(AVHWDeviceContext *hwdev)
{
AVDRMDeviceContext *hwctx = hwdev->hwctx;
close(hwctx->fd);
}
static int drm_device_create(AVHWDeviceContext *hwdev, const char *device,
AVDictionary *opts, int flags)
{
AVDRMDeviceContext *hwctx = hwdev->hwctx;
drmVersionPtr version;
hwctx->fd = open(device, O_RDWR);
if (hwctx->fd < 0)
return AVERROR(errno);
version = drmGetVersion(hwctx->fd);
if (!version) {
av_log(hwdev, AV_LOG_ERROR, "Failed to get version information "
"from %s: probably not a DRM device?\n", device);
close(hwctx->fd);
return AVERROR(EINVAL);
}
av_log(hwdev, AV_LOG_VERBOSE, "Opened DRM device %s: driver %s "
"version %d.%d.%d.\n", device, version->name,
version->version_major, version->version_minor,
version->version_patchlevel);
drmFreeVersion(version);
hwdev->free = &drm_device_free;
return 0;
}
static int drm_get_buffer(AVHWFramesContext *hwfc, AVFrame *frame)
{
frame->buf[0] = av_buffer_pool_get(hwfc->pool);
if (!frame->buf[0])
return AVERROR(ENOMEM);
frame->data[0] = (uint8_t*)frame->buf[0]->data;
frame->format = AV_PIX_FMT_DRM_PRIME;
frame->width = hwfc->width;
frame->height = hwfc->height;
return 0;
}
typedef struct DRMMapping {
// Address and length of each mmap()ed region.
int nb_regions;
int sync_flags;
int object[AV_DRM_MAX_PLANES];
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void *address[AV_DRM_MAX_PLANES];
size_t length[AV_DRM_MAX_PLANES];
} DRMMapping;
static void drm_unmap_frame(AVHWFramesContext *hwfc,
HWMapDescriptor *hwmap)
{
DRMMapping *map = hwmap->priv;
for (int i = 0; i < map->nb_regions; i++) {
#if HAVE_LINUX_DMA_BUF_H
struct dma_buf_sync sync = { .flags = DMA_BUF_SYNC_END | map->sync_flags };
ioctl(map->object[i], DMA_BUF_IOCTL_SYNC, &sync);
#endif
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munmap(map->address[i], map->length[i]);
}
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av_free(map);
}
static int drm_map_frame(AVHWFramesContext *hwfc,
AVFrame *dst, const AVFrame *src, int flags)
{
const AVDRMFrameDescriptor *desc = (AVDRMFrameDescriptor*)src->data[0];
#if HAVE_LINUX_DMA_BUF_H
struct dma_buf_sync sync_start = { 0 };
#endif
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DRMMapping *map;
int err, i, p, plane;
int mmap_prot;
void *addr;
map = av_mallocz(sizeof(*map));
if (!map)
return AVERROR(ENOMEM);
mmap_prot = 0;
if (flags & AV_HWFRAME_MAP_READ)
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mmap_prot |= PROT_READ;
if (flags & AV_HWFRAME_MAP_WRITE)
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mmap_prot |= PROT_WRITE;
#if HAVE_LINUX_DMA_BUF_H
if (flags & AV_HWFRAME_MAP_READ)
map->sync_flags |= DMA_BUF_SYNC_READ;
if (flags & AV_HWFRAME_MAP_WRITE)
map->sync_flags |= DMA_BUF_SYNC_WRITE;
sync_start.flags = DMA_BUF_SYNC_START | map->sync_flags;
#endif
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av_assert0(desc->nb_objects <= AV_DRM_MAX_PLANES);
for (i = 0; i < desc->nb_objects; i++) {
addr = mmap(NULL, desc->objects[i].size, mmap_prot, MAP_SHARED,
desc->objects[i].fd, 0);
if (addr == MAP_FAILED) {
err = AVERROR(errno);
av_log(hwfc, AV_LOG_ERROR, "Failed to map DRM object %d to "
"memory: %d.\n", desc->objects[i].fd, errno);
goto fail;
}
map->address[i] = addr;
map->length[i] = desc->objects[i].size;
map->object[i] = desc->objects[i].fd;
#if HAVE_LINUX_DMA_BUF_H
/* We're not checking for errors here because the kernel may not
* support the ioctl, in which case its okay to carry on */
ioctl(desc->objects[i].fd, DMA_BUF_IOCTL_SYNC, &sync_start);
#endif
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}
map->nb_regions = i;
plane = 0;
for (i = 0; i < desc->nb_layers; i++) {
const AVDRMLayerDescriptor *layer = &desc->layers[i];
for (p = 0; p < layer->nb_planes; p++) {
dst->data[plane] =
(uint8_t*)map->address[layer->planes[p].object_index] +
layer->planes[p].offset;
dst->linesize[plane] = layer->planes[p].pitch;
++plane;
}
}
av_assert0(plane <= AV_DRM_MAX_PLANES);
dst->width = src->width;
dst->height = src->height;
err = ff_hwframe_map_create(src->hw_frames_ctx, dst, src,
&drm_unmap_frame, map);
if (err < 0)
goto fail;
return 0;
fail:
for (i = 0; i < desc->nb_objects; i++) {
if (map->address[i])
munmap(map->address[i], map->length[i]);
}
av_free(map);
return err;
}
static int drm_transfer_get_formats(AVHWFramesContext *ctx,
enum AVHWFrameTransferDirection dir,
enum AVPixelFormat **formats)
{
enum AVPixelFormat *pix_fmts;
pix_fmts = av_malloc_array(2, sizeof(*pix_fmts));
if (!pix_fmts)
return AVERROR(ENOMEM);
pix_fmts[0] = ctx->sw_format;
pix_fmts[1] = AV_PIX_FMT_NONE;
*formats = pix_fmts;
return 0;
}
static int drm_transfer_data_from(AVHWFramesContext *hwfc,
AVFrame *dst, const AVFrame *src)
{
AVFrame *map;
int err;
if (dst->width > hwfc->width || dst->height > hwfc->height)
return AVERROR(EINVAL);
map = av_frame_alloc();
if (!map)
return AVERROR(ENOMEM);
map->format = dst->format;
err = drm_map_frame(hwfc, map, src, AV_HWFRAME_MAP_READ);
if (err)
goto fail;
map->width = dst->width;
map->height = dst->height;
err = av_frame_copy(dst, map);
if (err)
goto fail;
err = 0;
fail:
av_frame_free(&map);
return err;
}
static int drm_transfer_data_to(AVHWFramesContext *hwfc,
AVFrame *dst, const AVFrame *src)
{
AVFrame *map;
int err;
if (src->width > hwfc->width || src->height > hwfc->height)
return AVERROR(EINVAL);
map = av_frame_alloc();
if (!map)
return AVERROR(ENOMEM);
map->format = src->format;
err = drm_map_frame(hwfc, map, dst, AV_HWFRAME_MAP_WRITE |
AV_HWFRAME_MAP_OVERWRITE);
if (err)
goto fail;
map->width = src->width;
map->height = src->height;
err = av_frame_copy(map, src);
if (err)
goto fail;
err = 0;
fail:
av_frame_free(&map);
return err;
}
static int drm_map_from(AVHWFramesContext *hwfc, AVFrame *dst,
const AVFrame *src, int flags)
{
int err;
if (hwfc->sw_format != dst->format)
return AVERROR(ENOSYS);
err = drm_map_frame(hwfc, dst, src, flags);
if (err)
return err;
err = av_frame_copy_props(dst, src);
if (err)
return err;
return 0;
}
const HWContextType ff_hwcontext_type_drm = {
.type = AV_HWDEVICE_TYPE_DRM,
.name = "DRM",
.device_hwctx_size = sizeof(AVDRMDeviceContext),
.device_create = &drm_device_create,
.frames_get_buffer = &drm_get_buffer,
.transfer_get_formats = &drm_transfer_get_formats,
.transfer_data_to = &drm_transfer_data_to,
.transfer_data_from = &drm_transfer_data_from,
.map_from = &drm_map_from,
.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_DRM_PRIME,
AV_PIX_FMT_NONE
},
};