mirror of https://github.com/FFmpeg/FFmpeg.git
Mark Thompson
8 years ago
parent
7bae17e37a
commit
9cb23cd9fe
11 changed files with 481 additions and 1 deletions
@ -0,0 +1,289 @@ |
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/*
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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 <fcntl.h> |
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#include <sys/mman.h> |
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#include <unistd.h> |
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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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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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int i; |
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for (i = 0; i < map->nb_regions; i++) |
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munmap(map->address[i], map->length[i]); |
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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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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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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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} |
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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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@ -0,0 +1,166 @@ |
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/*
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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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#ifndef AVUTIL_HWCONTEXT_DRM_H |
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#define AVUTIL_HWCONTEXT_DRM_H |
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#include <stddef.h> |
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#include <stdint.h> |
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/**
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* @file |
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* API-specific header for AV_HWDEVICE_TYPE_DRM. |
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* |
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* Internal frame allocation is not currently supported - all frames |
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* must be allocated by the user. Thus AVHWFramesContext is always |
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* NULL, though this may change if support for frame allocation is |
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* added in future. |
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*/ |
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enum { |
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/**
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* The maximum number of layers/planes in a DRM frame. |
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*/ |
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AV_DRM_MAX_PLANES = 4 |
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}; |
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/**
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* DRM object descriptor. |
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* |
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* Describes a single DRM object, addressing it as a PRIME file |
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* descriptor. |
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*/ |
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typedef struct AVDRMObjectDescriptor { |
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/**
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* DRM PRIME fd for the object. |
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*/ |
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int fd; |
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/**
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* Total size of the object. |
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* |
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* (This includes any parts not which do not contain image data.) |
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*/ |
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size_t size; |
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/**
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* Format modifier applied to the object (DRM_FORMAT_MOD_*). |
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*/ |
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uint64_t format_modifier; |
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} AVDRMObjectDescriptor; |
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/**
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* DRM plane descriptor. |
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* |
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* Describes a single plane of a layer, which is contained within |
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* a single object. |
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*/ |
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typedef struct AVDRMPlaneDescriptor { |
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/**
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* Index of the object containing this plane in the objects |
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* array of the enclosing frame descriptor. |
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*/ |
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int object_index; |
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/**
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* Offset within that object of this plane. |
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*/ |
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ptrdiff_t offset; |
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/**
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* Pitch (linesize) of this plane. |
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*/ |
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ptrdiff_t pitch; |
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} AVDRMPlaneDescriptor; |
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/**
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* DRM layer descriptor. |
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* |
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* Describes a single layer within a frame. This has the structure |
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* defined by its format, and will contain one or more planes. |
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*/ |
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typedef struct AVDRMLayerDescriptor { |
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/**
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* Format of the layer (DRM_FORMAT_*). |
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*/ |
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uint32_t format; |
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/**
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* Number of planes in the layer. |
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* |
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* This must match the number of planes required by format. |
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*/ |
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int nb_planes; |
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/**
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* Array of planes in this layer. |
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*/ |
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AVDRMPlaneDescriptor planes[AV_DRM_MAX_PLANES]; |
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} AVDRMLayerDescriptor; |
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/**
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* DRM frame descriptor. |
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* |
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* This is used as the data pointer for AV_PIX_FMT_DRM_PRIME frames. |
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* It is also used by user-allocated frame pools - allocating in |
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* AVHWFramesContext.pool must return AVBufferRefs which contain |
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* an object of this type. |
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* |
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* The fields of this structure should be set such it can be |
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* imported directly by EGL using the EGL_EXT_image_dma_buf_import |
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* and EGL_EXT_image_dma_buf_import_modifiers extensions. |
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* (Note that the exact layout of a particular format may vary between |
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* platforms - we only specify that the same platform should be able |
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* to import it.) |
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* |
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* The total number of planes must not exceed AV_DRM_MAX_PLANES, and |
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* the order of the planes by increasing layer index followed by |
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* increasing plane index must be the same as the order which would |
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* be used for the data pointers in the equivalent software format. |
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*/ |
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typedef struct AVDRMFrameDescriptor { |
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/**
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* Number of DRM objects making up this frame. |
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*/ |
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int nb_objects; |
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/**
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* Array of objects making up the frame. |
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*/ |
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AVDRMObjectDescriptor objects[AV_DRM_MAX_PLANES]; |
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/**
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* Number of layers in the frame. |
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*/ |
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int nb_layers; |
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/**
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* Array of layers in the frame. |
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*/ |
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AVDRMLayerDescriptor layers[AV_DRM_MAX_PLANES]; |
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} AVDRMFrameDescriptor; |
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/**
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* DRM device. |
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* |
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* Allocated as AVHWDeviceContext.hwctx. |
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*/ |
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typedef struct AVDRMDeviceContext { |
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/**
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* File descriptor of DRM device. |
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* |
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* This is used as the device to create frames on, and may also be |
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* used in some derivation and mapping operations. |
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* |
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* If no device is required, set to -1. |
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*/ |
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int fd; |
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} AVDRMDeviceContext; |
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#endif /* AVUTIL_HWCONTEXT_DRM_H */ |
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