/* * 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" #include #include #include #include #include #include #include "avassert.h" #include "hwcontext_drm.h" #include "hwcontext_internal.h" #include "hwcontext_v4l2request.h" #include "mem.h" static void v4l2request_device_free(AVHWDeviceContext *hwdev) { AVV4L2RequestDeviceContext *hwctx = hwdev->hwctx; if (hwctx->media_fd >= 0) { close(hwctx->media_fd); hwctx->media_fd = -1; } } static int v4l2request_device_create(AVHWDeviceContext *hwdev, const char *device, AVDictionary *opts, int flags) { AVV4L2RequestDeviceContext *hwctx = hwdev->hwctx; hwctx->media_fd = -1; hwdev->free = v4l2request_device_free; // Use auto-detect if (!device || !device[0]) return 0; hwctx->media_fd = open(device, O_RDWR); if (hwctx->media_fd < 0) return AVERROR(errno); return 0; } static int v4l2request_device_init(AVHWDeviceContext *hwdev) { AVV4L2RequestDeviceContext *hwctx = hwdev->hwctx; struct media_device_info device_info; // Use auto-detect if (hwctx->media_fd < 0) return 0; if (ioctl(hwctx->media_fd, MEDIA_IOC_DEVICE_INFO, &device_info) < 0) return AVERROR(errno); av_log(hwdev, AV_LOG_VERBOSE, "Using V4L2 media driver %s (%u.%u.%u)\n", device_info.driver, device_info.driver_version >> 16, (device_info.driver_version >> 8) & 0xff, device_info.driver_version & 0xff); return 0; } static int v4l2request_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 object[AV_DRM_MAX_PLANES]; void *address[AV_DRM_MAX_PLANES]; size_t length[AV_DRM_MAX_PLANES]; } DRMMapping; static void v4l2request_unmap_frame(AVHWFramesContext *hwfc, HWMapDescriptor *hwmap) { DRMMapping *map = hwmap->priv; for (int i = 0; i < map->nb_regions; i++) { struct dma_buf_sync sync = { .flags = DMA_BUF_SYNC_END | DMA_BUF_SYNC_READ, }; ioctl(map->object[i], DMA_BUF_IOCTL_SYNC, &sync); munmap(map->address[i], map->length[i]); } av_free(map); } static int v4l2request_map_frame(AVHWFramesContext *hwfc, AVFrame *dst, const AVFrame *src) { const AVDRMFrameDescriptor *desc = (AVDRMFrameDescriptor *)src->data[0]; struct dma_buf_sync sync = { .flags = DMA_BUF_SYNC_START | DMA_BUF_SYNC_READ, }; DRMMapping *map; int ret, i, p, plane; void *addr; map = av_mallocz(sizeof(*map)); if (!map) return AVERROR(ENOMEM); av_assert0(desc->nb_objects <= AV_DRM_MAX_PLANES); for (i = 0; i < desc->nb_objects; i++) { addr = mmap(NULL, desc->objects[i].size, AV_HWFRAME_MAP_READ, MAP_SHARED, desc->objects[i].fd, 0); if (addr == MAP_FAILED) { av_log(hwfc, AV_LOG_ERROR, "Failed to map DRM object %d to memory: %s (%d)\n", desc->objects[i].fd, strerror(errno), errno); ret = AVERROR(errno); goto fail; } map->address[i] = addr; map->length[i] = desc->objects[i].size; map->object[i] = desc->objects[i].fd; /* * 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); } 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; ret = ff_hwframe_map_create(src->hw_frames_ctx, dst, src, v4l2request_unmap_frame, map); if (ret < 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 ret; } static int v4l2request_transfer_get_formats(AVHWFramesContext *hwfc, enum AVHWFrameTransferDirection dir, enum AVPixelFormat **formats) { enum AVPixelFormat *pix_fmts; if (dir == AV_HWFRAME_TRANSFER_DIRECTION_TO) return AVERROR(ENOSYS); pix_fmts = av_malloc_array(2, sizeof(*pix_fmts)); if (!pix_fmts) return AVERROR(ENOMEM); pix_fmts[0] = hwfc->sw_format; pix_fmts[1] = AV_PIX_FMT_NONE; *formats = pix_fmts; return 0; } static int v4l2request_transfer_data_from(AVHWFramesContext *hwfc, AVFrame *dst, const AVFrame *src) { AVFrame *map; int ret; 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; ret = v4l2request_map_frame(hwfc, map, src); if (ret) goto fail; map->width = dst->width; map->height = dst->height; ret = av_frame_copy(dst, map); if (ret) goto fail; ret = 0; fail: av_frame_free(&map); return ret; } const HWContextType ff_hwcontext_type_v4l2request = { .type = AV_HWDEVICE_TYPE_V4L2REQUEST, .name = "V4L2 Request API", .device_hwctx_size = sizeof(AVV4L2RequestDeviceContext), .device_create = v4l2request_device_create, .device_init = v4l2request_device_init, .frames_get_buffer = v4l2request_get_buffer, .transfer_get_formats = v4l2request_transfer_get_formats, .transfer_data_from = v4l2request_transfer_data_from, .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_DRM_PRIME, AV_PIX_FMT_NONE }, };