diff options
Diffstat (limited to 'libavdevice/kmsgrab.c')
| -rw-r--r-- | libavdevice/kmsgrab.c | 455 |
1 files changed, 455 insertions, 0 deletions
diff --git a/libavdevice/kmsgrab.c b/libavdevice/kmsgrab.c new file mode 100644 index 0000000000..d0b9cf5001 --- /dev/null +++ b/libavdevice/kmsgrab.c @@ -0,0 +1,455 @@ +/* + * KMS/DRM input device + * + * 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 <fcntl.h> +#include <unistd.h> + +#include <drm.h> +#include <drm_fourcc.h> +#include <drm_mode.h> +#include <xf86drm.h> +#include <xf86drmMode.h> + +#include "libavutil/hwcontext.h" +#include "libavutil/hwcontext_drm.h" +#include "libavutil/internal.h" +#include "libavutil/mathematics.h" +#include "libavutil/opt.h" +#include "libavutil/pixfmt.h" +#include "libavutil/pixdesc.h" +#include "libavutil/time.h" + +#include "libavformat/avformat.h" +#include "libavformat/internal.h" + +typedef struct KMSGrabContext { + const AVClass *class; + + AVBufferRef *device_ref; + AVHWDeviceContext *device; + AVDRMDeviceContext *hwctx; + + AVBufferRef *frames_ref; + AVHWFramesContext *frames; + + uint32_t plane_id; + uint32_t drm_format; + unsigned int width; + unsigned int height; + + int64_t frame_delay; + int64_t frame_last; + + const char *device_path; + enum AVPixelFormat format; + int64_t drm_format_modifier; + int64_t source_plane; + int64_t source_crtc; + AVRational framerate; +} KMSGrabContext; + +static void kmsgrab_free_desc(void *opaque, uint8_t *data) +{ + AVDRMFrameDescriptor *desc = (AVDRMFrameDescriptor*)data; + + close(desc->objects[0].fd); + + av_free(desc); +} + +static void kmsgrab_free_frame(void *opaque, uint8_t *data) +{ + AVFrame *frame = (AVFrame*)data; + + av_frame_free(&frame); +} + +static int kmsgrab_read_packet(AVFormatContext *avctx, AVPacket *pkt) +{ + KMSGrabContext *ctx = avctx->priv_data; + drmModePlane *plane; + drmModeFB *fb; + AVDRMFrameDescriptor *desc; + AVFrame *frame; + int64_t now; + int err, fd; + + now = av_gettime(); + if (ctx->frame_last) { + int64_t delay; + while (1) { + delay = ctx->frame_last + ctx->frame_delay - now; + if (delay <= 0) + break; + av_usleep(delay); + now = av_gettime(); + } + } + ctx->frame_last = now; + + plane = drmModeGetPlane(ctx->hwctx->fd, ctx->plane_id); + if (!plane) { + av_log(avctx, AV_LOG_ERROR, "Failed to get plane " + "%"PRIu32".\n", ctx->plane_id); + return AVERROR(EIO); + } + if (!plane->fb_id) { + av_log(avctx, AV_LOG_ERROR, "Plane %"PRIu32" no longer has " + "an associated framebuffer.\n", ctx->plane_id); + return AVERROR(EIO); + } + + fb = drmModeGetFB(ctx->hwctx->fd, plane->fb_id); + if (!fb) { + av_log(avctx, AV_LOG_ERROR, "Failed to get framebuffer " + "%"PRIu32".\n", plane->fb_id); + return AVERROR(EIO); + } + if (fb->width != ctx->width || fb->height != ctx->height) { + av_log(avctx, AV_LOG_ERROR, "Plane %"PRIu32" framebuffer " + "dimensions changed: now %"PRIu32"x%"PRIu32".\n", + ctx->plane_id, fb->width, fb->height); + return AVERROR(EIO); + } + if (!fb->handle) { + av_log(avctx, AV_LOG_ERROR, "No handle set on framebuffer.\n"); + return AVERROR(EIO); + } + + err = drmPrimeHandleToFD(ctx->hwctx->fd, fb->handle, O_RDONLY, &fd); + if (err < 0) { + err = errno; + av_log(avctx, AV_LOG_ERROR, "Failed to get PRIME fd from " + "framebuffer handle: %s.\n", strerror(errno)); + return AVERROR(err); + } + + desc = av_mallocz(sizeof(*desc)); + if (!desc) + return AVERROR(ENOMEM); + + *desc = (AVDRMFrameDescriptor) { + .nb_objects = 1, + .objects[0] = { + .fd = fd, + .size = fb->height * fb->pitch, + .format_modifier = ctx->drm_format_modifier, + }, + .nb_layers = 1, + .layers[0] = { + .format = ctx->drm_format, + .nb_planes = 1, + .planes[0] = { + .object_index = 0, + .offset = 0, + .pitch = fb->pitch, + }, + }, + }; + + frame = av_frame_alloc(); + if (!frame) + return AVERROR(ENOMEM); + + frame->hw_frames_ctx = av_buffer_ref(ctx->frames_ref); + if (!frame->hw_frames_ctx) + return AVERROR(ENOMEM); + + frame->buf[0] = av_buffer_create((uint8_t*)desc, sizeof(*desc), + &kmsgrab_free_desc, avctx, 0); + if (!frame->buf[0]) + return AVERROR(ENOMEM); + + frame->data[0] = (uint8_t*)desc; + frame->format = AV_PIX_FMT_DRM_PRIME; + frame->width = fb->width; + frame->height = fb->height; + + drmModeFreeFB(fb); + drmModeFreePlane(plane); + + pkt->buf = av_buffer_create((uint8_t*)frame, sizeof(*frame), + &kmsgrab_free_frame, avctx, 0); + if (!pkt->buf) + return AVERROR(ENOMEM); + + pkt->data = (uint8_t*)frame; + pkt->size = sizeof(*frame); + pkt->pts = now; + pkt->flags = AV_PKT_FLAG_TRUSTED; + + return 0; +} + +static const struct { + enum AVPixelFormat pixfmt; + uint32_t drm_format; +} kmsgrab_formats[] = { + { AV_PIX_FMT_GRAY8, DRM_FORMAT_R8 }, + { AV_PIX_FMT_GRAY16LE, DRM_FORMAT_R16 }, + { AV_PIX_FMT_RGB24, DRM_FORMAT_RGB888 }, + { AV_PIX_FMT_BGR24, DRM_FORMAT_BGR888 }, + { AV_PIX_FMT_0RGB, DRM_FORMAT_XRGB8888 }, + { AV_PIX_FMT_0BGR, DRM_FORMAT_XBGR8888 }, + { AV_PIX_FMT_RGB0, DRM_FORMAT_RGBX8888 }, + { AV_PIX_FMT_BGR0, DRM_FORMAT_BGRX8888 }, + { AV_PIX_FMT_ARGB, DRM_FORMAT_ARGB8888 }, + { AV_PIX_FMT_ABGR, DRM_FORMAT_ABGR8888 }, + { AV_PIX_FMT_RGBA, DRM_FORMAT_RGBA8888 }, + { AV_PIX_FMT_BGRA, DRM_FORMAT_BGRA8888 }, + { AV_PIX_FMT_YUYV422, DRM_FORMAT_YUYV }, + { AV_PIX_FMT_YVYU422, DRM_FORMAT_YVYU }, + { AV_PIX_FMT_UYVY422, DRM_FORMAT_UYVY }, + { AV_PIX_FMT_NV12, DRM_FORMAT_NV12 }, + { AV_PIX_FMT_YUV420P, DRM_FORMAT_YUV420 }, + { AV_PIX_FMT_YUV422P, DRM_FORMAT_YUV422 }, + { AV_PIX_FMT_YUV444P, DRM_FORMAT_YUV444 }, +}; + +static av_cold int kmsgrab_read_header(AVFormatContext *avctx) +{ + KMSGrabContext *ctx = avctx->priv_data; + drmModePlaneRes *plane_res = NULL; + drmModePlane *plane = NULL; + drmModeFB *fb = NULL; + AVStream *stream; + int err, i; + + for (i = 0; i < FF_ARRAY_ELEMS(kmsgrab_formats); i++) { + if (kmsgrab_formats[i].pixfmt == ctx->format) { + ctx->drm_format = kmsgrab_formats[i].drm_format; + break; + } + } + if (i >= FF_ARRAY_ELEMS(kmsgrab_formats)) { + av_log(avctx, AV_LOG_ERROR, "Unsupported format %s.\n", + av_get_pix_fmt_name(ctx->format)); + return AVERROR(EINVAL); + } + + err = av_hwdevice_ctx_create(&ctx->device_ref, AV_HWDEVICE_TYPE_DRM, + ctx->device_path, NULL, 0); + if (err < 0) { + av_log(avctx, AV_LOG_ERROR, "Failed to open DRM device.\n"); + return err; + } + ctx->device = (AVHWDeviceContext*) ctx->device_ref->data; + ctx->hwctx = (AVDRMDeviceContext*)ctx->device->hwctx; + + err = drmSetClientCap(ctx->hwctx->fd, + DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1); + if (err < 0) { + av_log(avctx, AV_LOG_WARNING, "Failed to set universal planes " + "capability: primary planes will not be usable.\n"); + } + + if (ctx->source_plane > 0) { + plane = drmModeGetPlane(ctx->hwctx->fd, ctx->source_plane); + if (!plane) { + err = errno; + av_log(avctx, AV_LOG_ERROR, "Failed to get plane %"PRId64": " + "%s.\n", ctx->source_plane, strerror(err)); + err = AVERROR(err); + goto fail; + } + + if (plane->fb_id == 0) { + av_log(avctx, AV_LOG_ERROR, "Plane %"PRId64" does not have " + "an attached framebuffer.\n", ctx->source_plane); + err = AVERROR(EINVAL); + goto fail; + } + } else { + plane_res = drmModeGetPlaneResources(ctx->hwctx->fd); + if (!plane_res) { + av_log(avctx, AV_LOG_ERROR, "Failed to get plane " + "resources: %s.\n", strerror(errno)); + err = AVERROR(EINVAL); + goto fail; + } + + for (i = 0; i < plane_res->count_planes; i++) { + plane = drmModeGetPlane(ctx->hwctx->fd, + plane_res->planes[i]); + if (!plane) { + err = errno; + av_log(avctx, AV_LOG_VERBOSE, "Failed to get " + "plane %"PRIu32": %s.\n", + plane_res->planes[i], strerror(err)); + continue; + } + + av_log(avctx, AV_LOG_DEBUG, "Plane %"PRIu32": " + "CRTC %"PRIu32" FB %"PRIu32".\n", + plane->plane_id, plane->crtc_id, plane->fb_id); + + if ((ctx->source_crtc > 0 && + plane->crtc_id != ctx->source_crtc) || + plane->fb_id == 0) { + // Either not connected to the target source CRTC + // or not active. + drmModeFreePlane(plane); + plane = NULL; + continue; + } + + break; + } + + if (i == plane_res->count_planes) { + if (ctx->source_crtc > 0) { + av_log(avctx, AV_LOG_ERROR, "No usable planes found on " + "CRTC %"PRId64".\n", ctx->source_crtc); + } else { + av_log(avctx, AV_LOG_ERROR, "No usable planes found.\n"); + } + err = AVERROR(EINVAL); + goto fail; + } + + av_log(avctx, AV_LOG_INFO, "Using plane %"PRIu32" to " + "locate framebuffers.\n", plane->plane_id); + } + + ctx->plane_id = plane->plane_id; + + fb = drmModeGetFB(ctx->hwctx->fd, plane->fb_id); + if (!fb) { + err = errno; + av_log(avctx, AV_LOG_ERROR, "Failed to get " + "framebuffer %"PRIu32": %s.\n", + plane->fb_id, strerror(err)); + err = AVERROR(err); + goto fail; + } + + av_log(avctx, AV_LOG_INFO, "Template framebuffer is %"PRIu32": " + "%"PRIu32"x%"PRIu32" %"PRIu32"bpp %"PRIu32"b depth.\n", + fb->fb_id, fb->width, fb->height, fb->bpp, fb->depth); + + ctx->width = fb->width; + ctx->height = fb->height; + + if (!fb->handle) { + av_log(avctx, AV_LOG_ERROR, "No handle set on framebuffer: " + "maybe you need some additional capabilities?\n"); + err = AVERROR(EINVAL); + goto fail; + } + + stream = avformat_new_stream(avctx, NULL); + if (!stream) { + err = AVERROR(ENOMEM); + goto fail; + } + + stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; + stream->codecpar->codec_id = AV_CODEC_ID_WRAPPED_AVFRAME; + stream->codecpar->width = fb->width; + stream->codecpar->height = fb->height; + stream->codecpar->format = AV_PIX_FMT_DRM_PRIME; + + avpriv_set_pts_info(stream, 64, 1, 1000000); + + ctx->frames_ref = av_hwframe_ctx_alloc(ctx->device_ref); + if (!ctx->frames_ref) { + err = AVERROR(ENOMEM); + goto fail; + } + ctx->frames = (AVHWFramesContext*)ctx->frames_ref->data; + + ctx->frames->format = AV_PIX_FMT_DRM_PRIME; + ctx->frames->sw_format = ctx->format, + ctx->frames->width = fb->width; + ctx->frames->height = fb->height; + + err = av_hwframe_ctx_init(ctx->frames_ref); + if (err < 0) { + av_log(avctx, AV_LOG_ERROR, "Failed to initialise " + "hardware frames context: %d.\n", err); + goto fail; + } + + ctx->frame_delay = av_rescale_q(1, (AVRational) { ctx->framerate.den, + ctx->framerate.num }, AV_TIME_BASE_Q); + + err = 0; +fail: + if (plane_res) + drmModeFreePlaneResources(plane_res); + if (plane) + drmModeFreePlane(plane); + if (fb) + drmModeFreeFB(fb); + + return err; +} + +static av_cold int kmsgrab_read_close(AVFormatContext *avctx) +{ + KMSGrabContext *ctx = avctx->priv_data; + + av_buffer_unref(&ctx->frames_ref); + av_buffer_unref(&ctx->device_ref); + + return 0; +} + +#define OFFSET(x) offsetof(KMSGrabContext, x) +#define FLAGS AV_OPT_FLAG_DECODING_PARAM +static const AVOption options[] = { + { "device", "DRM device path", + OFFSET(device_path), AV_OPT_TYPE_STRING, + { .str = "/dev/dri/card0" }, 0, 0, FLAGS }, + { "format", "Pixel format for framebuffer", + OFFSET(format), AV_OPT_TYPE_PIXEL_FMT, + { .i64 = AV_PIX_FMT_BGR0 }, 0, UINT32_MAX, FLAGS }, + { "format_modifier", "DRM format modifier for framebuffer", + OFFSET(drm_format_modifier), AV_OPT_TYPE_INT64, + { .i64 = DRM_FORMAT_MOD_NONE }, 0, INT64_MAX, FLAGS }, + { "crtc_id", "CRTC ID to define capture source", + OFFSET(source_crtc), AV_OPT_TYPE_INT64, + { .i64 = 0 }, 0, UINT32_MAX, FLAGS }, + { "plane_id", "Plane ID to define capture source", + OFFSET(source_plane), AV_OPT_TYPE_INT64, + { .i64 = 0 }, 0, UINT32_MAX, FLAGS }, + { "framerate", "Framerate to capture at", + OFFSET(framerate), AV_OPT_TYPE_RATIONAL, + { .dbl = 30.0 }, 0, 1000, FLAGS }, + { NULL }, +}; + +static const AVClass kmsgrab_class = { + .class_name = "kmsgrab indev", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +AVInputFormat ff_kmsgrab_demuxer = { + .name = "kmsgrab", + .long_name = NULL_IF_CONFIG_SMALL("KMS screen capture"), + .priv_data_size = sizeof(KMSGrabContext), + .read_header = &kmsgrab_read_header, + .read_packet = &kmsgrab_read_packet, + .read_close = &kmsgrab_read_close, + .flags = AVFMT_NOFILE, + .priv_class = &kmsgrab_class, +}; |