add fbdev video output to mpv

mpv_fbdev.patch

commit de7e2edc14a5418abd5298e0cc76caa3d3bb5faa
Author: uobikiemukot <uobikiemukot@gmail.com>
Date:   Wed Aug 26 20:14:34 2015 +0900

    add framebuffer video output

diff --git a/video/out/vo.c b/video/out/vo.c
index de79fb0..d7d909c 100644
--- a/video/out/vo.c
+++ b/video/out/vo.c
@@ -63,6 +63,7 @@ extern const struct vo_driver video_out_sdl;
 extern const struct vo_driver video_out_vaapi;
 extern const struct vo_driver video_out_wayland;
 extern const struct vo_driver video_out_rpi;
+extern const struct vo_driver video_out_fbdev;
 
 const struct vo_driver *const video_out_drivers[] =
 {
@@ -107,6 +108,9 @@ const struct vo_driver *const video_out_drivers[] =
     &video_out_opengl_hq,
     &video_out_opengl_cb,
 #endif
+#if HAVE_FBDEV
+    &video_out_fbdev,
+#endif
     NULL
 };
 
diff --git a/video/out/vo_fbdev.c b/video/out/vo_fbdev.c
new file mode 100644
index 0000000..673eebf
--- /dev/null
+++ b/video/out/vo_fbdev.c
@@ -0,0 +1,292 @@
+/*
+ * based on vo_drm.c
+ *
+ * Copyright (C) Aaron Holtzman - June 2000
+ *
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mpv 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/fb.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include <libswscale/swscale.h>
+
+#include "common/msg.h"
+#include "options/m_option.h"
+#include "sub/osd.h"
+#include "video/fmt-conversion.h"
+#include "video/mp_image.h"
+#include "video/sws_utils.h"
+#include "vo.h"
+
+enum {
+	BITS_PER_BYTE   = 8,
+	BYTES_PER_PIXEL = 4,
+	IMGFMT = IMGFMT_BGR0
+};
+
+struct priv {
+    int fd;               /* file descriptor of framebuffer */
+    uint8_t *fp;          /* pointer of framebuffer */
+    int width, height;    /* display resolution */
+    long screen_size;     /* screen data size (byte) */
+    int line_length;      /* line length (byte) */
+    int bytes_per_pixel;
+    int bits_per_pixel;
+
+	/* option params */
+	char *fb_path;        /* framebuffer device (check FRAMEBUFFER env too) */
+	int shift_x, shift_y;
+	int video_width, video_height;
+
+	/* mp image */
+	struct mp_image *cur_frame;
+	struct mp_image *last_input;
+	struct mp_rect src;
+	struct mp_rect dst;
+	struct mp_osd_res osd;
+	struct mp_sws_context *sws;
+};
+
+static void draw_image(struct vo *vo, mp_image_t *mpi)
+{
+	struct priv *fb     = vo->priv;
+	struct mp_image src = *mpi;
+
+	if (mpi) {
+		mp_sws_scale(fb->sws, fb->cur_frame, &src);
+		osd_draw_on_image(vo->osd, fb->osd, src.pts, 0, fb->cur_frame);
+
+		int w = fb->src.x1 - fb->src.y0;
+		int h = fb->src.y1 - fb->src.y0;
+
+		memcpy_pic(fb->fp + fb->shift_y * fb->line_length + fb->shift_x * fb->bytes_per_pixel,
+			fb->cur_frame->planes[0],
+			w * BYTES_PER_PIXEL,
+			h,
+			fb->line_length,
+			fb->cur_frame->stride[0]);
+
+		/*
+		for (int i = 0; i < h; i++) {
+			memcpy(fb->fp + (i + fb->shift_y) * fb->line_length + fb->shift_x * fb->bytes_per_pixel,
+				fb->cur_frame->planes[0] + i * fb->cur_frame->stride[0],
+				w * BYTES_PER_PIXEL);
+		}
+		*/
+	}
+
+	if (mpi != fb->last_input) {
+		talloc_free(fb->last_input);
+		fb->last_input = mpi;
+	}
+}
+
+static void flip_page(struct vo *vo)
+{
+	return;
+}
+
+static int query_format(struct vo *vo, int format)
+{
+	return sws_isSupportedInput(imgfmt2pixfmt(format));
+}
+
+static int reconfig(struct vo *vo, struct mp_image_params *params, int flags)
+{
+	struct priv *fb = vo->priv;
+	int dst_w, dst_h, src_w, src_h;
+
+	vo_get_src_dst_rects(vo, &fb->src, &fb->dst, &fb->osd);
+
+	dst_w = fb->dst.x1 - fb->dst.x0;
+	dst_h = fb->dst.y1 - fb->dst.y0;
+
+	if (fb->video_width != -1) {
+		src_w = fb->video_width;
+		src_h = (fb->video_height != -1) ?
+			fb->video_height:
+			(double) src_w * vo->dheight / vo->dwidth;
+
+		fb->src.x0 = fb->src.y0 = 0;
+		fb->src.x1 = src_w;
+		fb->src.y1 = src_h;
+
+	} else {
+		src_w = fb->src.x1 - fb->src.x0;
+		src_h = fb->src.y1 - fb->src.y0;
+	}
+
+	// fb->osd contains the parameters assuming OSD rendering in window
+	// coordinates, but OSD can only be rendered in the intersection
+	// between window and video rectangle (i.e. not into panscan borders).
+	fb->osd.w = src_w;
+	fb->osd.h = src_h;
+	fb->osd.mt = MPMIN(0, fb->osd.mt);
+	fb->osd.mb = MPMIN(0, fb->osd.mb);
+	fb->osd.mr = MPMIN(0, fb->osd.mr);
+	fb->osd.ml = MPMIN(0, fb->osd.ml);
+
+	mp_sws_set_from_cmdline(fb->sws, vo->opts->sws_opts);
+	fb->sws->src = *params;
+	fb->sws->dst = (struct mp_image_params) {
+		.imgfmt = IMGFMT,
+		.w = src_w,
+		.h = src_h,
+		.d_w = dst_w,
+		.d_h = dst_h,
+	};
+
+	talloc_free(fb->cur_frame);
+	fb->cur_frame = mp_image_alloc(IMGFMT, src_w, src_h);
+
+	mp_image_params_guess_csp(&fb->sws->dst);
+	mp_image_set_params(fb->cur_frame, &fb->sws->dst);
+
+	if (mp_sws_reinit(fb->sws) < 0)
+		return -1;
+
+	vo->want_redraw = true;
+
+    return 0;
+}
+
+static void uninit(struct vo *vo)
+{
+	struct priv *fb = vo->priv;
+
+	munmap(fb->fp, fb->screen_size);
+
+	talloc_free(fb->last_input);
+	talloc_free(fb->cur_frame);
+	talloc_free(fb->sws);
+
+	close(fb->fd);
+}
+
+static int preinit(struct vo *vo)
+{
+	char *env, *path;
+	struct priv *fb = vo->priv;
+	struct fb_fix_screeninfo finfo;
+	struct fb_var_screeninfo vinfo;
+
+	path = ((env = getenv("FRAMEBUFFER")) != NULL) ? env: fb->fb_path;
+	if ((fb->fd = open(path, O_RDWR)) < 0) {
+		MP_ERR(vo, "cannot open %s: %s\n", path, mp_strerror(errno));
+		goto err;
+	}
+
+	if (ioctl(fb->fd, FBIOGET_FSCREENINFO, &finfo)) {
+		MP_ERR(vo, "ioctl: FBIOGET_FSCREENINFO failed\n");
+		goto err;
+	}
+
+	if (ioctl(fb->fd, FBIOGET_VSCREENINFO, &vinfo)) {
+		MP_ERR(vo, "ioctl: FBIOGET_FSCREENINFO failed\n");
+		goto err;
+	}
+
+	fb->width  = vinfo.xres;
+	fb->height = vinfo.yres;
+	fb->screen_size = finfo.smem_len;
+	fb->line_length = finfo.line_length;
+
+	fb->bits_per_pixel  = vinfo.bits_per_pixel;
+	fb->bytes_per_pixel = (fb->bits_per_pixel + BITS_PER_BYTE - 1) / BITS_PER_BYTE;
+
+	if (fb->bits_per_pixel != 32
+		|| finfo.type != FB_TYPE_PACKED_PIXELS
+		|| finfo.visual != FB_VISUAL_TRUECOLOR) {
+		MP_ERR(vo, "bits per pixel: %d not supported\n", fb->bits_per_pixel);
+		goto err;
+	}
+
+	/* check screen [xy]offset and initialize because linux console changes these values */
+	if (vinfo.xoffset != 0 || vinfo.yoffset != 0) {
+		vinfo.xoffset = vinfo.yoffset = 0;
+		if (ioctl(fb->fd, FBIOPUT_VSCREENINFO, &vinfo))
+			MP_WARN(vo, "couldn't reset offset (x:%d y:%d)\n", vinfo.xoffset, vinfo.yoffset);
+	}
+
+	fb->fp  = mmap(0, fb->screen_size, PROT_WRITE | PROT_READ, MAP_SHARED, fb->fd, 0);
+	fb->sws = mp_sws_alloc(vo);
+
+	if (fb->fp == MAP_FAILED)
+		goto err;
+
+	return 0;
+
+err:
+	return -1;
+}
+
+static int control(struct vo *vo, uint32_t request, void *data)
+{
+	struct priv *fb = vo->priv;
+
+	switch (request) {
+	case VOCTRL_SCREENSHOT_WIN:
+		*(struct mp_image **) data = mp_image_new_copy(fb->cur_frame);
+		return VO_TRUE;
+	case VOCTRL_REDRAW_FRAME:
+		draw_image(vo, fb->last_input);
+		return VO_TRUE;
+	case VOCTRL_GET_PANSCAN:
+		return VO_TRUE;
+	case VOCTRL_SET_PANSCAN:
+		if (vo->config_ok)
+			reconfig(vo, vo->params, 0);
+		return VO_TRUE;
+	}
+	return VO_NOTIMPL;
+}
+
+#define OPT_BASE_STRUCT struct priv
+
+const struct vo_driver video_out_fbdev = {
+    .description = "Linux framebuffer output",
+    .name = "fbdev",
+    .preinit = preinit,
+    .query_format = query_format,
+    .reconfig = reconfig,
+    .control = control,
+    .draw_image = draw_image,
+    .flip_page = flip_page,
+    .uninit = uninit,
+    .priv_size = sizeof(struct priv),
+    .options = (const struct m_option[]) {
+		OPT_STRING("fb_path", fb_path, 0),
+		OPT_INT("shift_x", shift_x, 0),
+		OPT_INT("shift_y", shift_y, 0),
+		OPT_INT("video_width", video_width, 0),
+		OPT_INT("video_height", video_height, 0),
+        {0},
+    },
+	.priv_defaults = &(const struct priv) {
+		.fb_path = "/dev/fb0",
+		.shift_x = 0,
+		.shift_y = 0,
+		.video_width  = -1,
+		.video_height = -1,
+	},
+};
diff --git a/wscript b/wscript
index 0a5bf61..c5229b1 100644
--- a/wscript
+++ b/wscript
@@ -655,6 +655,10 @@ video_output_features = [
         'deps': [ 'vt.h' ],
         'func': check_pkg_config('libdrm'),
     }, {
+        'name': '--fbdev',
+        'desc': 'FBDEV',
+        'func': check_headers('linux/fb.h'),
+    }, {
         'name': '--jpeg',
         'desc': 'JPEG support',
         'func': check_cc(header_name=['stdio.h', 'jpeglib.h'],
diff --git a/wscript_build.py b/wscript_build.py
index a96fb87..37a9218 100644
--- a/wscript_build.py
+++ b/wscript_build.py
@@ -348,6 +348,7 @@ def build(ctx):
         ( "video/out/vo.c" ),
         ( "video/out/vo_caca.c",                 "caca" ),
         ( "video/out/vo_drm.c",                  "drm" ),
+        ( "video/out/vo_fbdev.c",                "fbdev" ),
         ( "video/out/vo_direct3d.c",             "direct3d" ),
         ( "video/out/vo_image.c" ),
         ( "video/out/vo_lavc.c",                 "encoding" ),

Why is this still not in upstream?

I can't find a pull request or open issue on mpv repository. Did you consider upstreaming this or is there a particular reason for not doing so?

mplayer and mplayer2 have fbdev driver, but mpv dropped framebuffer support.
(maybe there are a few users who need fbdev driver...)
So I don't intend to create pull request for this patch.

I am try to build on this patch, but a lot of errors occur.

| ../../../../../../workspace/sources/mpv/video/out/vo_fbdev.c:149:4: error: implicit declaration of function 'mp_sws_set_from_cmdline' [-Werror=implicit-function-declaration]
|   149 |    mp_sws_set_from_cmdline(fb->sws, vo->opts->sws_opts);
|       |    ^~~~~~~~~~~~~~~~~~~~~~~
| ../../../../../../workspace/sources/mpv/video/out/vo_fbdev.c:149:45: error: 'struct mp_vo_opts' has no member named 'sws_opts'
|   149 |    mp_sws_set_from_cmdline(fb->sws, vo->opts->sws_opts);
|       |                                             ^~
| ../../../../../../workspace/sources/mpv/video/out/vo_fbdev.c:155:9: error: 'struct mp_image_params' has no member named 'd_w'; did you mean 'p_w'?
|   155 |        .d_w = dst_w,
|       |         ^~~
|       |         p_w
| ../../../../../../workspace/sources/mpv/video/out/vo_fbdev.c:156:9: error: 'struct mp_image_params' has no member named 'd_h'; did you mean 'p_h'?
|   156 |        .d_h = dst_h,
|       |         ^~~
|       |         p_h
| ../../../../../../workspace/sources/mpv/video/out/vo_fbdev.c: In function 'control':
| ../../../../../../workspace/sources/mpv/video/out/vo_fbdev.c:254:9: error: 'VOCTRL_GET_PANSCAN' undeclared (first use in this function); did you mean 'VOCTRL_SET_PANSCAN'?
|   254 |    case VOCTRL_GET_PANSCAN:
|       |         ^~~~~~~~~~~~~~~~~~
|       |         VOCTRL_SET_PANSCAN
| ../../../../../../workspace/sources/mpv/video/out/vo_fbdev.c:254:9: note: each undeclared identifier is reported only once for each function it appears in