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Diffstat (limited to 'libavdevice/fbdev_enc.c')
-rw-r--r--libavdevice/fbdev_enc.c220
1 files changed, 220 insertions, 0 deletions
diff --git a/libavdevice/fbdev_enc.c b/libavdevice/fbdev_enc.c
new file mode 100644
index 0000000000..28efc7131b
--- /dev/null
+++ b/libavdevice/fbdev_enc.c
@@ -0,0 +1,220 @@
+/*
+ * Copyright (c) 2013 Lukasz Marek
+ *
+ * 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 <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <linux/fb.h>
+#include "libavutil/pixdesc.h"
+#include "libavutil/log.h"
+#include "libavutil/mem.h"
+#include "libavutil/opt.h"
+#include "libavformat/avformat.h"
+#include "fbdev_common.h"
+#include "avdevice.h"
+
+typedef struct {
+ AVClass *class; ///< class for private options
+ int xoffset; ///< x coordinate of top left corner
+ int yoffset; ///< y coordinate of top left corner
+ struct fb_var_screeninfo varinfo; ///< framebuffer variable info
+ struct fb_fix_screeninfo fixinfo; ///< framebuffer fixed info
+ int fd; ///< framebuffer device file descriptor
+ uint8_t *data; ///< framebuffer data
+} FBDevContext;
+
+static av_cold int fbdev_write_header(AVFormatContext *h)
+{
+ FBDevContext *fbdev = h->priv_data;
+ enum AVPixelFormat pix_fmt;
+ int ret, flags = O_RDWR;
+ const char* device;
+
+ if (h->nb_streams != 1 || h->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO) {
+ av_log(fbdev, AV_LOG_ERROR, "Only a single video stream is supported.\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (h->filename[0])
+ device = h->filename;
+ else
+ device = ff_fbdev_default_device();
+
+ if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
+ ret = AVERROR(errno);
+ av_log(h, AV_LOG_ERROR,
+ "Could not open framebuffer device '%s': %s\n",
+ device, av_err2str(ret));
+ return ret;
+ }
+
+ if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
+ ret = AVERROR(errno);
+ av_log(h, AV_LOG_ERROR, "FBIOGET_VSCREENINFO: %s\n", av_err2str(ret));
+ goto fail;
+ }
+
+ if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
+ ret = AVERROR(errno);
+ av_log(h, AV_LOG_ERROR, "FBIOGET_FSCREENINFO: %s\n", av_err2str(ret));
+ goto fail;
+ }
+
+ pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
+ if (pix_fmt == AV_PIX_FMT_NONE) {
+ ret = AVERROR(EINVAL);
+ av_log(h, AV_LOG_ERROR, "Framebuffer pixel format not supported.\n");
+ goto fail;
+ }
+
+ fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_WRITE, MAP_SHARED, fbdev->fd, 0);
+ if (fbdev->data == MAP_FAILED) {
+ ret = AVERROR(errno);
+ av_log(h, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret));
+ goto fail;
+ }
+
+ return 0;
+ fail:
+ close(fbdev->fd);
+ return ret;
+}
+
+static int fbdev_write_packet(AVFormatContext *h, AVPacket *pkt)
+{
+ FBDevContext *fbdev = h->priv_data;
+ uint8_t *pin, *pout;
+ enum AVPixelFormat fb_pix_fmt;
+ int disp_height;
+ int bytes_to_copy;
+ AVCodecContext *codec_ctx = h->streams[0]->codec;
+ enum AVPixelFormat video_pix_fmt = codec_ctx->pix_fmt;
+ int video_width = codec_ctx->width;
+ int video_height = codec_ctx->height;
+ int bytes_per_pixel = ((codec_ctx->bits_per_coded_sample + 7) >> 3);
+ int src_line_size = video_width * bytes_per_pixel;
+ int i;
+
+ if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0)
+ av_log(h, AV_LOG_WARNING,
+ "Error refreshing variable info: %s\n", av_err2str(AVERROR(errno)));
+
+ fb_pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
+
+ if (fb_pix_fmt != video_pix_fmt) {
+ av_log(h, AV_LOG_ERROR, "Pixel format %s is not supported, use %s\n",
+ av_get_pix_fmt_name(video_pix_fmt), av_get_pix_fmt_name(fb_pix_fmt));
+ return AVERROR(EINVAL);
+ }
+
+ disp_height = FFMIN(fbdev->varinfo.yres, video_height);
+ bytes_to_copy = FFMIN(fbdev->varinfo.xres, video_width) * bytes_per_pixel;
+
+ pin = pkt->data;
+ pout = fbdev->data +
+ bytes_per_pixel * fbdev->varinfo.xoffset +
+ fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
+
+ if (fbdev->xoffset) {
+ if (fbdev->xoffset < 0) {
+ if (-fbdev->xoffset >= video_width) //nothing to display
+ return 0;
+ bytes_to_copy += fbdev->xoffset * bytes_per_pixel;
+ pin -= fbdev->xoffset * bytes_per_pixel;
+ } else {
+ int diff = (video_width + fbdev->xoffset) - fbdev->varinfo.xres;
+ if (diff > 0) {
+ if (diff >= video_width) //nothing to display
+ return 0;
+ bytes_to_copy -= diff * bytes_per_pixel;
+ }
+ pout += bytes_per_pixel * fbdev->xoffset;
+ }
+ }
+
+ if (fbdev->yoffset) {
+ if (fbdev->yoffset < 0) {
+ if (-fbdev->yoffset >= video_height) //nothing to display
+ return 0;
+ disp_height += fbdev->yoffset;
+ pin -= fbdev->yoffset * src_line_size;
+ } else {
+ int diff = (video_height + fbdev->yoffset) - fbdev->varinfo.yres;
+ if (diff > 0) {
+ if (diff >= video_height) //nothing to display
+ return 0;
+ disp_height -= diff;
+ }
+ pout += fbdev->yoffset * fbdev->fixinfo.line_length;
+ }
+ }
+
+ for (i = 0; i < disp_height; i++) {
+ memcpy(pout, pin, bytes_to_copy);
+ pout += fbdev->fixinfo.line_length;
+ pin += src_line_size;
+ }
+
+ return 0;
+}
+
+static av_cold int fbdev_write_trailer(AVFormatContext *h)
+{
+ FBDevContext *fbdev = h->priv_data;
+ munmap(fbdev->data, fbdev->fixinfo.smem_len);
+ close(fbdev->fd);
+ return 0;
+}
+
+static int fbdev_get_device_list(AVFormatContext *s, AVDeviceInfoList *device_list)
+{
+ return ff_fbdev_get_device_list(device_list);
+}
+
+#define OFFSET(x) offsetof(FBDevContext, x)
+#define ENC AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+ { "xoffset", "set x coordinate of top left corner", OFFSET(xoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
+ { "yoffset", "set y coordinate of top left corner", OFFSET(yoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
+ { NULL }
+};
+
+static const AVClass fbdev_class = {
+ .class_name = "fbdev outdev",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+ .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
+};
+
+AVOutputFormat ff_fbdev_muxer = {
+ .name = "fbdev",
+ .long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
+ .priv_data_size = sizeof(FBDevContext),
+ .audio_codec = AV_CODEC_ID_NONE,
+ .video_codec = AV_CODEC_ID_RAWVIDEO,
+ .write_header = fbdev_write_header,
+ .write_packet = fbdev_write_packet,
+ .write_trailer = fbdev_write_trailer,
+ .get_device_list = fbdev_get_device_list,
+ .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
+ .priv_class = &fbdev_class,
+};