fbdev output for xvideo, basic ARM build

2 files changed, 252 insertions, 0 deletions

diff --git a/frontend/linux/fbdev.c b/frontend/linux/fbdev.c
new file mode 100644
index 0000000..6ae0c77
--- /dev/null
+++ b/frontend/linux/fbdev.c
@@ -0,0 +1,240 @@
+/*
+ * (C) Gražvydas "notaz" Ignotas, 2009-2010
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <linux/fb.h>
+#include <linux/matroxfb.h>
+
+#include "fbdev.h"
+
+#define FBDEV_MAX_BUFFERS 3
+
+struct vout_fbdev {
+	int	fd;
+	void	*mem;
+	size_t	mem_size;
+	struct	fb_var_screeninfo fbvar_old;
+	struct	fb_var_screeninfo fbvar_new;
+	int	buffer_write;
+	int	fb_size;
+	int	buffer_count;
+	int	top_border, bottom_border;
+};
+
+void *vout_fbdev_flip(struct vout_fbdev *fbdev)
+{
+	int draw_buf;
+
+	if (fbdev->buffer_count < 2)
+		return fbdev->mem;
+
+	draw_buf = fbdev->buffer_write;
+	fbdev->buffer_write++;
+	if (fbdev->buffer_write >= fbdev->buffer_count)
+		fbdev->buffer_write = 0;
+
+	fbdev->fbvar_new.yoffset = 
+		(fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
+		fbdev->top_border;
+
+	ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
+
+	return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
+}
+
+void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
+{
+	int arg = 0;
+	ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
+}
+
+int vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h,
+		      int left_border, int right_border, int top_border, int bottom_border, int no_dblbuf)
+{
+	int w_total = left_border + w + right_border;
+	int h_total = top_border + h + bottom_border;
+	size_t mem_size;
+	int ret;
+
+	// unblank to be sure the mode is really accepted
+	ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
+
+	if (fbdev->fbvar_new.bits_per_pixel != 16 ||
+			w != fbdev->fbvar_new.xres ||
+			h != fbdev->fbvar_new.yres ||
+			w_total != fbdev->fbvar_new.xres_virtual ||
+			h_total > fbdev->fbvar_new.yres_virtual ||
+			left_border != fbdev->fbvar_new.xoffset) {
+		fbdev->fbvar_new.xres = w;
+		fbdev->fbvar_new.yres = h;
+		fbdev->fbvar_new.xres_virtual = w_total;
+		fbdev->fbvar_new.yres_virtual = h_total;
+		fbdev->fbvar_new.xoffset = left_border;
+		fbdev->fbvar_new.bits_per_pixel = 16;
+		printf(" switching to %dx%d@16\n", w, h);
+		ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
+		if (ret == -1) {
+			perror("FBIOPUT_VSCREENINFO ioctl");
+			return -1;
+		}
+	}
+
+	fbdev->buffer_count = FBDEV_MAX_BUFFERS; // be optimistic
+	if (no_dblbuf)
+		fbdev->buffer_count = 1;
+
+	if (fbdev->fbvar_new.yres_virtual < h_total * fbdev->buffer_count) {
+		fbdev->fbvar_new.yres_virtual = h_total * fbdev->buffer_count;
+		ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
+		if (ret == -1) {
+			fbdev->buffer_count = 1;
+			fprintf(stderr, "Warning: failed to increase virtual resolution, "
+					"doublebuffering disabled\n");
+		}
+	}
+
+	fbdev->fb_size = w_total * h_total * 2;
+	fbdev->top_border = top_border;
+	fbdev->bottom_border = bottom_border;
+
+	mem_size = fbdev->fb_size * fbdev->buffer_count;
+	if (fbdev->mem_size >= mem_size)
+		return 0;
+
+	if (fbdev->mem != NULL)
+		munmap(fbdev->mem, fbdev->mem_size);
+
+	fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
+	if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
+		fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", fbdev->mem_size);
+		fbdev->buffer_count = 1;
+		mem_size = fbdev->fb_size;
+		fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
+	}
+	if (fbdev->mem == MAP_FAILED) {
+		fbdev->mem = NULL;
+		fbdev->mem_size = 0;
+		perror("mmap framebuffer");
+		return -1;
+	}
+
+	fbdev->mem_size = mem_size;
+	return 0;
+}
+
+void vout_fbdev_clear(struct vout_fbdev *fbdev)
+{
+	memset(fbdev->mem, 0, fbdev->mem_size);
+}
+
+void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
+{
+	int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
+	int i;
+
+	if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
+		count = fbdev->top_border + fbdev->fbvar_new.yres - y;
+
+	if (y >= 0 && count > 0)
+		for (i = 0; i < fbdev->buffer_count; i++)
+			memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
+}
+
+int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
+{
+	return fbdev->fd;
+}
+
+struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int no_dblbuf)
+{
+	struct vout_fbdev *fbdev;
+	int req_w, req_h;
+	int ret;
+
+	fbdev = calloc(1, sizeof(*fbdev));
+	if (fbdev == NULL)
+		return NULL;
+
+	fbdev->fd = open(fbdev_name, O_RDWR);
+	if (fbdev->fd == -1) {
+		fprintf(stderr, "%s: ", fbdev_name);
+		perror("open");
+		goto fail_open;
+	}
+
+	ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
+	if (ret == -1) {
+		perror("FBIOGET_VSCREENINFO ioctl");
+		goto fail;
+	}
+
+	fbdev->fbvar_new = fbdev->fbvar_old;
+
+	req_w = fbdev->fbvar_new.xres;
+	if (*w != 0)
+		req_w = *w;
+	req_h = fbdev->fbvar_new.yres;
+	if (*h != 0)
+		req_h = *h;
+
+	ret = vout_fbdev_resize(fbdev, req_w, req_h, 0, 0, 0, 0, no_dblbuf);
+	if (ret != 0)
+		goto fail;
+
+	printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres,
+		fbdev->fbvar_new.bits_per_pixel);
+	*w = fbdev->fbvar_new.xres;
+	*h = fbdev->fbvar_new.yres;
+
+	memset(fbdev->mem, 0, fbdev->mem_size);
+
+	// some checks
+	ret = 0;
+	ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
+	if (ret != 0)
+		fprintf(stderr, "Warning: vsync doesn't seem to be supported\n");
+
+	if (fbdev->buffer_count > 1) {
+		fbdev->buffer_write = 0;
+		fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
+		ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
+		if (ret != 0) {
+			fbdev->buffer_count = 1;
+			fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
+		}
+	}
+
+	printf("fbdev initialized.\n");
+	return fbdev;
+
+fail:
+	close(fbdev->fd);
+fail_open:
+	free(fbdev);
+	return NULL;
+}
+
+void vout_fbdev_finish(struct vout_fbdev *fbdev)
+{
+	ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
+	if (fbdev->mem != MAP_FAILED)
+		munmap(fbdev->mem, fbdev->mem_size);
+	if (fbdev->fd >= 0)
+		close(fbdev->fd);
+	fbdev->mem = NULL;
+	fbdev->fd = -1;
+	free(fbdev);
+}
+
diff --git a/frontend/linux/fbdev.h b/frontend/linux/fbdev.h
new file mode 100644
index 0000000..fa163aa
--- /dev/null
+++ b/frontend/linux/fbdev.h
@@ -0,0 +1,12 @@
+struct vout_fbdev;
+
+struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int no_dblbuf);
+void *vout_fbdev_flip(struct vout_fbdev *fbdev);
+void  vout_fbdev_wait_vsync(struct vout_fbdev *fbdev);
+int   vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h,
+			int left_border, int right_border, int top_border, int bottom_border,
+			int no_dblbuf);
+void  vout_fbdev_clear(struct vout_fbdev *fbdev);
+void  vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count);
+int   vout_fbdev_get_fd(struct vout_fbdev *fbdev);
+void  vout_fbdev_finish(struct vout_fbdev *fbdev);