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FFmpeg4/libavdevice/kmsgrab.c

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/*
* 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[] = {
#ifdef DRM_FORMAT_R8
{ AV_PIX_FMT_GRAY8, DRM_FORMAT_R8 },
#endif
#ifdef DRM_FORMAT_R16
{ AV_PIX_FMT_GRAY16LE, DRM_FORMAT_R16 },
{ AV_PIX_FMT_GRAY16BE, DRM_FORMAT_R16 | DRM_FORMAT_BIG_ENDIAN },
#endif
{ AV_PIX_FMT_BGR8, DRM_FORMAT_BGR233 },
{ AV_PIX_FMT_RGB555LE, DRM_FORMAT_XRGB1555 },
{ AV_PIX_FMT_RGB555BE, DRM_FORMAT_XRGB1555 | DRM_FORMAT_BIG_ENDIAN },
{ AV_PIX_FMT_BGR555LE, DRM_FORMAT_XBGR1555 },
{ AV_PIX_FMT_BGR555BE, DRM_FORMAT_XBGR1555 | DRM_FORMAT_BIG_ENDIAN },
{ AV_PIX_FMT_RGB565LE, DRM_FORMAT_RGB565 },
{ AV_PIX_FMT_RGB565BE, DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN },
{ AV_PIX_FMT_BGR565LE, DRM_FORMAT_BGR565 },
{ AV_PIX_FMT_BGR565BE, DRM_FORMAT_BGR565 | DRM_FORMAT_BIG_ENDIAN },
{ AV_PIX_FMT_RGB24, DRM_FORMAT_RGB888 },
{ AV_PIX_FMT_BGR24, DRM_FORMAT_BGR888 },
{ AV_PIX_FMT_0RGB, DRM_FORMAT_BGRX8888 },
{ AV_PIX_FMT_0BGR, DRM_FORMAT_RGBX8888 },
{ AV_PIX_FMT_RGB0, DRM_FORMAT_XBGR8888 },
{ AV_PIX_FMT_BGR0, DRM_FORMAT_XRGB8888 },
{ AV_PIX_FMT_ARGB, DRM_FORMAT_BGRA8888 },
{ AV_PIX_FMT_ABGR, DRM_FORMAT_RGBA8888 },
{ AV_PIX_FMT_RGBA, DRM_FORMAT_ABGR8888 },
{ AV_PIX_FMT_BGRA, DRM_FORMAT_ARGB8888 },
{ AV_PIX_FMT_YUYV422, DRM_FORMAT_YUYV },
{ AV_PIX_FMT_YVYU422, DRM_FORMAT_YVYU },
{ AV_PIX_FMT_UYVY422, DRM_FORMAT_UYVY },
};
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,
.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
};
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,
};
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