2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include <linux/dma-buf.h>
23 #include <sys/ioctl.h>
29 #include "hwcontext.h"
30 #include "hwcontext_drm.h"
31 #include "hwcontext_internal.h"
35 static void drm_device_free(AVHWDeviceContext *hwdev)
37 AVDRMDeviceContext *hwctx = hwdev->hwctx;
42 static int drm_device_create(AVHWDeviceContext *hwdev, const char *device,
43 AVDictionary *opts, int flags)
45 AVDRMDeviceContext *hwctx = hwdev->hwctx;
46 drmVersionPtr version;
48 hwctx->fd = open(device, O_RDWR);
50 return AVERROR(errno);
52 version = drmGetVersion(hwctx->fd);
54 av_log(hwdev, AV_LOG_ERROR, "Failed to get version information "
55 "from %s: probably not a DRM device?\n", device);
57 return AVERROR(EINVAL);
60 av_log(hwdev, AV_LOG_VERBOSE, "Opened DRM device %s: driver %s "
61 "version %d.%d.%d.\n", device, version->name,
62 version->version_major, version->version_minor,
63 version->version_patchlevel);
65 drmFreeVersion(version);
67 hwdev->free = &drm_device_free;
72 static int drm_get_buffer(AVHWFramesContext *hwfc, AVFrame *frame)
74 frame->buf[0] = av_buffer_pool_get(hwfc->pool);
76 return AVERROR(ENOMEM);
78 frame->data[0] = (uint8_t*)frame->buf[0]->data;
80 frame->format = AV_PIX_FMT_DRM_PRIME;
81 frame->width = hwfc->width;
82 frame->height = hwfc->height;
87 typedef struct DRMMapping {
88 // Address and length of each mmap()ed region.
91 int object[AV_DRM_MAX_PLANES];
92 void *address[AV_DRM_MAX_PLANES];
93 size_t length[AV_DRM_MAX_PLANES];
96 static void drm_unmap_frame(AVHWFramesContext *hwfc,
97 HWMapDescriptor *hwmap)
99 DRMMapping *map = hwmap->priv;
100 struct dma_buf_sync sync = { .flags = DMA_BUF_SYNC_END | map->sync_flags };
103 for (i = 0; i < map->nb_regions; i++) {
104 ret = ioctl(map->object[i], DMA_BUF_IOCTL_SYNC, &sync);
106 av_log(hwfc, AV_LOG_ERROR, "Failed to issue ioctl sync to DRM object "
107 "%d: %d.\n", map->object[i], errno);
108 munmap(map->address[i], map->length[i]);
114 static int drm_map_frame(AVHWFramesContext *hwfc,
115 AVFrame *dst, const AVFrame *src, int flags)
117 const AVDRMFrameDescriptor *desc = (AVDRMFrameDescriptor*)src->data[0];
118 struct dma_buf_sync sync_start = { 0 };
120 int err, i, p, plane;
124 map = av_mallocz(sizeof(*map));
126 return AVERROR(ENOMEM);
129 if (flags & AV_HWFRAME_MAP_READ) {
130 mmap_prot |= PROT_READ;
131 map->sync_flags |= DMA_BUF_SYNC_READ;
133 if (flags & AV_HWFRAME_MAP_WRITE) {
134 mmap_prot |= PROT_WRITE;
135 map->sync_flags |= DMA_BUF_SYNC_WRITE;
138 sync_start.flags = DMA_BUF_SYNC_START | map->sync_flags;
140 av_assert0(desc->nb_objects <= AV_DRM_MAX_PLANES);
141 for (i = 0; i < desc->nb_objects; i++) {
142 addr = mmap(NULL, desc->objects[i].size, mmap_prot, MAP_SHARED,
143 desc->objects[i].fd, 0);
144 if (addr == MAP_FAILED) {
145 err = AVERROR(errno);
146 av_log(hwfc, AV_LOG_ERROR, "Failed to map DRM object %d to "
147 "memory: %d.\n", desc->objects[i].fd, errno);
151 map->address[i] = addr;
152 map->length[i] = desc->objects[i].size;
153 map->object[i] = desc->objects[i].fd;
155 err = ioctl(desc->objects[i].fd, DMA_BUF_IOCTL_SYNC, &sync_start);
157 err = AVERROR(errno);
158 av_log(hwfc, AV_LOG_ERROR, "Failed to issue ioctl sync to DRM object "
159 "%d: %d.\n", desc->objects[i].fd, errno);
166 for (i = 0; i < desc->nb_layers; i++) {
167 const AVDRMLayerDescriptor *layer = &desc->layers[i];
168 for (p = 0; p < layer->nb_planes; p++) {
170 (uint8_t*)map->address[layer->planes[p].object_index] +
171 layer->planes[p].offset;
172 dst->linesize[plane] = layer->planes[p].pitch;
176 av_assert0(plane <= AV_DRM_MAX_PLANES);
178 dst->width = src->width;
179 dst->height = src->height;
181 err = ff_hwframe_map_create(src->hw_frames_ctx, dst, src,
182 &drm_unmap_frame, map);
189 for (i = 0; i < desc->nb_objects; i++) {
191 munmap(map->address[i], map->length[i]);
197 static int drm_transfer_get_formats(AVHWFramesContext *ctx,
198 enum AVHWFrameTransferDirection dir,
199 enum AVPixelFormat **formats)
201 enum AVPixelFormat *pix_fmts;
203 pix_fmts = av_malloc_array(2, sizeof(*pix_fmts));
205 return AVERROR(ENOMEM);
207 pix_fmts[0] = ctx->sw_format;
208 pix_fmts[1] = AV_PIX_FMT_NONE;
214 static int drm_transfer_data_from(AVHWFramesContext *hwfc,
215 AVFrame *dst, const AVFrame *src)
220 if (dst->width > hwfc->width || dst->height > hwfc->height)
221 return AVERROR(EINVAL);
223 map = av_frame_alloc();
225 return AVERROR(ENOMEM);
226 map->format = dst->format;
228 err = drm_map_frame(hwfc, map, src, AV_HWFRAME_MAP_READ);
232 map->width = dst->width;
233 map->height = dst->height;
235 err = av_frame_copy(dst, map);
245 static int drm_transfer_data_to(AVHWFramesContext *hwfc,
246 AVFrame *dst, const AVFrame *src)
251 if (src->width > hwfc->width || src->height > hwfc->height)
252 return AVERROR(EINVAL);
254 map = av_frame_alloc();
256 return AVERROR(ENOMEM);
257 map->format = src->format;
259 err = drm_map_frame(hwfc, map, dst, AV_HWFRAME_MAP_WRITE |
260 AV_HWFRAME_MAP_OVERWRITE);
264 map->width = src->width;
265 map->height = src->height;
267 err = av_frame_copy(map, src);
277 static int drm_map_from(AVHWFramesContext *hwfc, AVFrame *dst,
278 const AVFrame *src, int flags)
282 if (hwfc->sw_format != dst->format)
283 return AVERROR(ENOSYS);
285 err = drm_map_frame(hwfc, dst, src, flags);
289 err = av_frame_copy_props(dst, src);
296 const HWContextType ff_hwcontext_type_drm = {
297 .type = AV_HWDEVICE_TYPE_DRM,
300 .device_hwctx_size = sizeof(AVDRMDeviceContext),
302 .device_create = &drm_device_create,
304 .frames_get_buffer = &drm_get_buffer,
306 .transfer_get_formats = &drm_transfer_get_formats,
307 .transfer_data_to = &drm_transfer_data_to,
308 .transfer_data_from = &drm_transfer_data_from,
309 .map_from = &drm_map_from,
311 .pix_fmts = (const enum AVPixelFormat[]) {
312 AV_PIX_FMT_DRM_PRIME,