221 lines
7.4 KiB
C
221 lines
7.4 KiB
C
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/*
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* Copyright (c) 2013 Lukasz Marek
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <linux/fb.h>
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#include "libavutil/pixdesc.h"
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#include "libavutil/log.h"
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#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include "libavformat/avformat.h"
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#include "fbdev_common.h"
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#include "avdevice.h"
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typedef struct {
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AVClass *class; ///< class for private options
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int xoffset; ///< x coordinate of top left corner
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int yoffset; ///< y coordinate of top left corner
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struct fb_var_screeninfo varinfo; ///< framebuffer variable info
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struct fb_fix_screeninfo fixinfo; ///< framebuffer fixed info
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int fd; ///< framebuffer device file descriptor
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uint8_t *data; ///< framebuffer data
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} FBDevContext;
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static av_cold int fbdev_write_header(AVFormatContext *h)
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{
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FBDevContext *fbdev = h->priv_data;
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enum AVPixelFormat pix_fmt;
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int ret, flags = O_RDWR;
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const char* device;
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if (h->nb_streams != 1 || h->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
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av_log(fbdev, AV_LOG_ERROR, "Only a single video stream is supported.\n");
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return AVERROR(EINVAL);
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}
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if (h->url[0])
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device = h->url;
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else
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device = ff_fbdev_default_device();
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if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
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ret = AVERROR(errno);
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av_log(h, AV_LOG_ERROR,
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"Could not open framebuffer device '%s': %s\n",
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device, av_err2str(ret));
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return ret;
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}
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if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
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ret = AVERROR(errno);
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av_log(h, AV_LOG_ERROR, "FBIOGET_VSCREENINFO: %s\n", av_err2str(ret));
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goto fail;
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}
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if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
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ret = AVERROR(errno);
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av_log(h, AV_LOG_ERROR, "FBIOGET_FSCREENINFO: %s\n", av_err2str(ret));
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goto fail;
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}
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pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
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if (pix_fmt == AV_PIX_FMT_NONE) {
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ret = AVERROR(EINVAL);
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av_log(h, AV_LOG_ERROR, "Framebuffer pixel format not supported.\n");
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goto fail;
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}
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fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_WRITE, MAP_SHARED, fbdev->fd, 0);
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if (fbdev->data == MAP_FAILED) {
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ret = AVERROR(errno);
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av_log(h, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret));
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goto fail;
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}
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return 0;
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fail:
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close(fbdev->fd);
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return ret;
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}
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static int fbdev_write_packet(AVFormatContext *h, AVPacket *pkt)
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{
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FBDevContext *fbdev = h->priv_data;
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uint8_t *pin, *pout;
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enum AVPixelFormat fb_pix_fmt;
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int disp_height;
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int bytes_to_copy;
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AVCodecParameters *par = h->streams[0]->codecpar;
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enum AVPixelFormat video_pix_fmt = par->format;
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int video_width = par->width;
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int video_height = par->height;
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int bytes_per_pixel = ((par->bits_per_coded_sample + 7) >> 3);
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int src_line_size = video_width * bytes_per_pixel;
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int i;
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if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0)
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av_log(h, AV_LOG_WARNING,
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"Error refreshing variable info: %s\n", av_err2str(AVERROR(errno)));
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fb_pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
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if (fb_pix_fmt != video_pix_fmt) {
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av_log(h, AV_LOG_ERROR, "Pixel format %s is not supported, use %s\n",
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av_get_pix_fmt_name(video_pix_fmt), av_get_pix_fmt_name(fb_pix_fmt));
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return AVERROR(EINVAL);
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}
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disp_height = FFMIN(fbdev->varinfo.yres, video_height);
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bytes_to_copy = FFMIN(fbdev->varinfo.xres, video_width) * bytes_per_pixel;
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pin = pkt->data;
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pout = fbdev->data +
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bytes_per_pixel * fbdev->varinfo.xoffset +
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fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
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if (fbdev->xoffset) {
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if (fbdev->xoffset < 0) {
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if (-fbdev->xoffset >= video_width) //nothing to display
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return 0;
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bytes_to_copy += fbdev->xoffset * bytes_per_pixel;
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pin -= fbdev->xoffset * bytes_per_pixel;
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} else {
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int diff = (video_width + fbdev->xoffset) - fbdev->varinfo.xres;
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if (diff > 0) {
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if (diff >= video_width) //nothing to display
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return 0;
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bytes_to_copy -= diff * bytes_per_pixel;
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}
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pout += bytes_per_pixel * fbdev->xoffset;
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}
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}
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if (fbdev->yoffset) {
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if (fbdev->yoffset < 0) {
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if (-fbdev->yoffset >= video_height) //nothing to display
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return 0;
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disp_height += fbdev->yoffset;
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pin -= fbdev->yoffset * src_line_size;
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} else {
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int diff = (video_height + fbdev->yoffset) - fbdev->varinfo.yres;
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if (diff > 0) {
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if (diff >= video_height) //nothing to display
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return 0;
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disp_height -= diff;
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}
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pout += fbdev->yoffset * fbdev->fixinfo.line_length;
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}
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}
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for (i = 0; i < disp_height; i++) {
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memcpy(pout, pin, bytes_to_copy);
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pout += fbdev->fixinfo.line_length;
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pin += src_line_size;
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}
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return 0;
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}
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static av_cold int fbdev_write_trailer(AVFormatContext *h)
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{
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FBDevContext *fbdev = h->priv_data;
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munmap(fbdev->data, fbdev->fixinfo.smem_len);
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close(fbdev->fd);
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return 0;
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}
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static int fbdev_get_device_list(AVFormatContext *s, AVDeviceInfoList *device_list)
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{
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return ff_fbdev_get_device_list(device_list);
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}
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#define OFFSET(x) offsetof(FBDevContext, x)
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#define ENC AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "xoffset", "set x coordinate of top left corner", OFFSET(xoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
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{ "yoffset", "set y coordinate of top left corner", OFFSET(yoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
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{ NULL }
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};
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static const AVClass fbdev_class = {
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.class_name = "fbdev outdev",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
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};
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AVOutputFormat ff_fbdev_muxer = {
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.name = "fbdev",
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.long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
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.priv_data_size = sizeof(FBDevContext),
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.audio_codec = AV_CODEC_ID_NONE,
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.video_codec = AV_CODEC_ID_RAWVIDEO,
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.write_header = fbdev_write_header,
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.write_packet = fbdev_write_packet,
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.write_trailer = fbdev_write_trailer,
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.get_device_list = fbdev_get_device_list,
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.flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
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.priv_class = &fbdev_class,
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};
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