diff options
Diffstat (limited to 'libavdevice/fbdev_enc.c')
| -rw-r--r-- | libavdevice/fbdev_enc.c | 220 |
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, +}; 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