324 lines
8.6 KiB
C
324 lines
8.6 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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/* This was introduced in version 4.6. And may not exist all without an
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* optional package. So to prevent a hard dependency on needing the Linux
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* kernel headers to compile, make this optional. */
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#if HAVE_LINUX_DMA_BUF_H
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#include <linux/dma-buf.h>
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#include <sys/ioctl.h>
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#endif
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#include <drm.h>
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#include <xf86drm.h>
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#include "avassert.h"
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#include "hwcontext.h"
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#include "hwcontext_drm.h"
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#include "hwcontext_internal.h"
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#include "imgutils.h"
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static void drm_device_free(AVHWDeviceContext *hwdev)
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{
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AVDRMDeviceContext *hwctx = hwdev->hwctx;
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close(hwctx->fd);
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}
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static int drm_device_create(AVHWDeviceContext *hwdev, const char *device,
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AVDictionary *opts, int flags)
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{
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AVDRMDeviceContext *hwctx = hwdev->hwctx;
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drmVersionPtr version;
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hwctx->fd = open(device, O_RDWR);
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if (hwctx->fd < 0)
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return AVERROR(errno);
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version = drmGetVersion(hwctx->fd);
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if (!version) {
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av_log(hwdev, AV_LOG_ERROR, "Failed to get version information "
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"from %s: probably not a DRM device?\n", device);
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close(hwctx->fd);
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return AVERROR(EINVAL);
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}
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av_log(hwdev, AV_LOG_VERBOSE, "Opened DRM device %s: driver %s "
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"version %d.%d.%d.\n", device, version->name,
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version->version_major, version->version_minor,
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version->version_patchlevel);
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drmFreeVersion(version);
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hwdev->free = &drm_device_free;
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return 0;
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}
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static int drm_get_buffer(AVHWFramesContext *hwfc, AVFrame *frame)
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{
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frame->buf[0] = av_buffer_pool_get(hwfc->pool);
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if (!frame->buf[0])
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return AVERROR(ENOMEM);
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frame->data[0] = (uint8_t*)frame->buf[0]->data;
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frame->format = AV_PIX_FMT_DRM_PRIME;
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frame->width = hwfc->width;
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frame->height = hwfc->height;
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return 0;
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}
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typedef struct DRMMapping {
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// Address and length of each mmap()ed region.
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int nb_regions;
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int sync_flags;
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int object[AV_DRM_MAX_PLANES];
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void *address[AV_DRM_MAX_PLANES];
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size_t length[AV_DRM_MAX_PLANES];
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} DRMMapping;
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static void drm_unmap_frame(AVHWFramesContext *hwfc,
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HWMapDescriptor *hwmap)
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{
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DRMMapping *map = hwmap->priv;
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for (int i = 0; i < map->nb_regions; i++) {
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#if HAVE_LINUX_DMA_BUF_H
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struct dma_buf_sync sync = { .flags = DMA_BUF_SYNC_END | map->sync_flags };
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ioctl(map->object[i], DMA_BUF_IOCTL_SYNC, &sync);
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#endif
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munmap(map->address[i], map->length[i]);
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}
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av_free(map);
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}
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static int drm_map_frame(AVHWFramesContext *hwfc,
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AVFrame *dst, const AVFrame *src, int flags)
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{
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const AVDRMFrameDescriptor *desc = (AVDRMFrameDescriptor*)src->data[0];
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#if HAVE_LINUX_DMA_BUF_H
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struct dma_buf_sync sync_start = { 0 };
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#endif
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DRMMapping *map;
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int err, i, p, plane;
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int mmap_prot;
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void *addr;
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map = av_mallocz(sizeof(*map));
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if (!map)
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return AVERROR(ENOMEM);
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mmap_prot = 0;
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if (flags & AV_HWFRAME_MAP_READ)
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mmap_prot |= PROT_READ;
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if (flags & AV_HWFRAME_MAP_WRITE)
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mmap_prot |= PROT_WRITE;
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#if HAVE_LINUX_DMA_BUF_H
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if (flags & AV_HWFRAME_MAP_READ)
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map->sync_flags |= DMA_BUF_SYNC_READ;
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if (flags & AV_HWFRAME_MAP_WRITE)
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map->sync_flags |= DMA_BUF_SYNC_WRITE;
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sync_start.flags = DMA_BUF_SYNC_START | map->sync_flags;
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#endif
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av_assert0(desc->nb_objects <= AV_DRM_MAX_PLANES);
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for (i = 0; i < desc->nb_objects; i++) {
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addr = mmap(NULL, desc->objects[i].size, mmap_prot, MAP_SHARED,
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desc->objects[i].fd, 0);
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if (addr == MAP_FAILED) {
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err = AVERROR(errno);
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av_log(hwfc, AV_LOG_ERROR, "Failed to map DRM object %d to "
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"memory: %d.\n", desc->objects[i].fd, errno);
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goto fail;
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}
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map->address[i] = addr;
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map->length[i] = desc->objects[i].size;
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map->object[i] = desc->objects[i].fd;
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#if HAVE_LINUX_DMA_BUF_H
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/* We're not checking for errors here because the kernel may not
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* support the ioctl, in which case its okay to carry on */
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ioctl(desc->objects[i].fd, DMA_BUF_IOCTL_SYNC, &sync_start);
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#endif
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}
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map->nb_regions = i;
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plane = 0;
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for (i = 0; i < desc->nb_layers; i++) {
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const AVDRMLayerDescriptor *layer = &desc->layers[i];
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for (p = 0; p < layer->nb_planes; p++) {
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dst->data[plane] =
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(uint8_t*)map->address[layer->planes[p].object_index] +
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layer->planes[p].offset;
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dst->linesize[plane] = layer->planes[p].pitch;
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++plane;
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}
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}
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av_assert0(plane <= AV_DRM_MAX_PLANES);
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dst->width = src->width;
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dst->height = src->height;
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err = ff_hwframe_map_create(src->hw_frames_ctx, dst, src,
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&drm_unmap_frame, map);
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if (err < 0)
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goto fail;
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return 0;
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fail:
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for (i = 0; i < desc->nb_objects; i++) {
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if (map->address[i])
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munmap(map->address[i], map->length[i]);
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}
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av_free(map);
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return err;
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}
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static int drm_transfer_get_formats(AVHWFramesContext *ctx,
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enum AVHWFrameTransferDirection dir,
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enum AVPixelFormat **formats)
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{
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enum AVPixelFormat *pix_fmts;
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pix_fmts = av_malloc_array(2, sizeof(*pix_fmts));
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if (!pix_fmts)
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return AVERROR(ENOMEM);
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pix_fmts[0] = ctx->sw_format;
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pix_fmts[1] = AV_PIX_FMT_NONE;
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*formats = pix_fmts;
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return 0;
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}
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static int drm_transfer_data_from(AVHWFramesContext *hwfc,
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AVFrame *dst, const AVFrame *src)
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{
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AVFrame *map;
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int err;
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if (dst->width > hwfc->width || dst->height > hwfc->height)
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return AVERROR(EINVAL);
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map = av_frame_alloc();
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if (!map)
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return AVERROR(ENOMEM);
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map->format = dst->format;
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err = drm_map_frame(hwfc, map, src, AV_HWFRAME_MAP_READ);
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if (err)
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goto fail;
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map->width = dst->width;
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map->height = dst->height;
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err = av_frame_copy(dst, map);
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if (err)
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goto fail;
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err = 0;
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fail:
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av_frame_free(&map);
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return err;
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}
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static int drm_transfer_data_to(AVHWFramesContext *hwfc,
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AVFrame *dst, const AVFrame *src)
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{
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AVFrame *map;
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int err;
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if (src->width > hwfc->width || src->height > hwfc->height)
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return AVERROR(EINVAL);
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map = av_frame_alloc();
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if (!map)
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return AVERROR(ENOMEM);
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map->format = src->format;
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err = drm_map_frame(hwfc, map, dst, AV_HWFRAME_MAP_WRITE |
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AV_HWFRAME_MAP_OVERWRITE);
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if (err)
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goto fail;
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map->width = src->width;
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map->height = src->height;
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err = av_frame_copy(map, src);
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if (err)
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goto fail;
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err = 0;
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fail:
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av_frame_free(&map);
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return err;
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}
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static int drm_map_from(AVHWFramesContext *hwfc, AVFrame *dst,
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const AVFrame *src, int flags)
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{
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int err;
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if (hwfc->sw_format != dst->format)
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return AVERROR(ENOSYS);
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err = drm_map_frame(hwfc, dst, src, flags);
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if (err)
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return err;
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err = av_frame_copy_props(dst, src);
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if (err)
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return err;
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return 0;
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}
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const HWContextType ff_hwcontext_type_drm = {
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.type = AV_HWDEVICE_TYPE_DRM,
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.name = "DRM",
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.device_hwctx_size = sizeof(AVDRMDeviceContext),
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.device_create = &drm_device_create,
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.frames_get_buffer = &drm_get_buffer,
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.transfer_get_formats = &drm_transfer_get_formats,
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.transfer_data_to = &drm_transfer_data_to,
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.transfer_data_from = &drm_transfer_data_from,
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.map_from = &drm_map_from,
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.pix_fmts = (const enum AVPixelFormat[]) {
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AV_PIX_FMT_DRM_PRIME,
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AV_PIX_FMT_NONE
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},
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};
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