diff options
Diffstat (limited to 'libavdevice/fbdev_dec.c')
-rw-r--r-- | libavdevice/fbdev_dec.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/libavdevice/fbdev_dec.c b/libavdevice/fbdev_dec.c new file mode 100644 index 0000000..d53b9e5 --- /dev/null +++ b/libavdevice/fbdev_dec.c @@ -0,0 +1,238 @@ +/* + * Copyright (c) 2011 Stefano Sabatini + * Copyright (c) 2009 Giliard B. de Freitas <giliarde@gmail.com> + * Copyright (C) 2002 Gunnar Monell <gmo@linux.nu> + * + * 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 + */ + +/** + * @file + * Linux framebuffer input device, + * inspired by code from fbgrab.c by Gunnar Monell. + * @see http://linux-fbdev.sourceforge.net/ + */ + +#include <unistd.h> +#include <fcntl.h> +#include <sys/ioctl.h> +#include <sys/mman.h> +#include <time.h> +#include <linux/fb.h> + +#include "libavutil/internal.h" +#include "libavutil/log.h" +#include "libavutil/mem.h" +#include "libavutil/opt.h" +#include "libavutil/time.h" +#include "libavutil/parseutils.h" +#include "libavutil/pixdesc.h" +#include "libavformat/internal.h" +#include "avdevice.h" +#include "fbdev_common.h" + +typedef struct { + AVClass *class; ///< class for private options + int frame_size; ///< size in bytes of a grabbed frame + AVRational framerate_q; ///< framerate + int64_t time_frame; ///< time for the next frame to output (in 1/1000000 units) + + int fd; ///< framebuffer device file descriptor + int width, height; ///< assumed frame resolution + int frame_linesize; ///< linesize of the output frame, it is assumed to be constant + int bytes_per_pixel; + + struct fb_var_screeninfo varinfo; ///< variable info; + struct fb_fix_screeninfo fixinfo; ///< fixed info; + + uint8_t *data; ///< framebuffer data +} FBDevContext; + +static av_cold int fbdev_read_header(AVFormatContext *avctx) +{ + FBDevContext *fbdev = avctx->priv_data; + AVStream *st = NULL; + enum AVPixelFormat pix_fmt; + int ret, flags = O_RDONLY; + + if (!(st = avformat_new_stream(avctx, NULL))) + return AVERROR(ENOMEM); + avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in microseconds */ + + /* NONBLOCK is ignored by the fbdev driver, only set for consistency */ + if (avctx->flags & AVFMT_FLAG_NONBLOCK) + flags |= O_NONBLOCK; + + if ((fbdev->fd = avpriv_open(avctx->filename, flags)) == -1) { + ret = AVERROR(errno); + av_log(avctx, AV_LOG_ERROR, + "Could not open framebuffer device '%s': %s\n", + avctx->filename, av_err2str(ret)); + return ret; + } + + if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) { + ret = AVERROR(errno); + av_log(avctx, 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(avctx, 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(avctx, AV_LOG_ERROR, + "Framebuffer pixel format not supported.\n"); + goto fail; + } + + fbdev->width = fbdev->varinfo.xres; + fbdev->height = fbdev->varinfo.yres; + fbdev->bytes_per_pixel = (fbdev->varinfo.bits_per_pixel + 7) >> 3; + fbdev->frame_linesize = fbdev->width * fbdev->bytes_per_pixel; + fbdev->frame_size = fbdev->frame_linesize * fbdev->height; + fbdev->time_frame = AV_NOPTS_VALUE; + fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_READ, MAP_SHARED, fbdev->fd, 0); + if (fbdev->data == MAP_FAILED) { + ret = AVERROR(errno); + av_log(avctx, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret)); + goto fail; + } + + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_id = AV_CODEC_ID_RAWVIDEO; + st->codec->width = fbdev->width; + st->codec->height = fbdev->height; + st->codec->pix_fmt = pix_fmt; + st->codec->time_base = av_inv_q(fbdev->framerate_q); + st->codec->bit_rate = + fbdev->width * fbdev->height * fbdev->bytes_per_pixel * av_q2d(fbdev->framerate_q) * 8; + + av_log(avctx, AV_LOG_INFO, + "w:%d h:%d bpp:%d pixfmt:%s fps:%d/%d bit_rate:%d\n", + fbdev->width, fbdev->height, fbdev->varinfo.bits_per_pixel, + av_get_pix_fmt_name(pix_fmt), + fbdev->framerate_q.num, fbdev->framerate_q.den, + st->codec->bit_rate); + return 0; + +fail: + close(fbdev->fd); + return ret; +} + +static int fbdev_read_packet(AVFormatContext *avctx, AVPacket *pkt) +{ + FBDevContext *fbdev = avctx->priv_data; + int64_t curtime, delay; + struct timespec ts; + int i, ret; + uint8_t *pin, *pout; + + if (fbdev->time_frame == AV_NOPTS_VALUE) + fbdev->time_frame = av_gettime(); + + /* wait based on the frame rate */ + while (1) { + curtime = av_gettime(); + delay = fbdev->time_frame - curtime; + av_dlog(avctx, + "time_frame:%"PRId64" curtime:%"PRId64" delay:%"PRId64"\n", + fbdev->time_frame, curtime, delay); + if (delay <= 0) { + fbdev->time_frame += INT64_C(1000000) / av_q2d(fbdev->framerate_q); + break; + } + if (avctx->flags & AVFMT_FLAG_NONBLOCK) + return AVERROR(EAGAIN); + ts.tv_sec = delay / 1000000; + ts.tv_nsec = (delay % 1000000) * 1000; + while (nanosleep(&ts, &ts) < 0 && errno == EINTR); + } + + if ((ret = av_new_packet(pkt, fbdev->frame_size)) < 0) + return ret; + + /* refresh fbdev->varinfo, visible data position may change at each call */ + if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) + av_log(avctx, AV_LOG_WARNING, + "Error refreshing variable info: %s\n", av_err2str(ret)); + + pkt->pts = curtime; + + /* compute visible data offset */ + pin = fbdev->data + fbdev->bytes_per_pixel * fbdev->varinfo.xoffset + + fbdev->varinfo.yoffset * fbdev->fixinfo.line_length; + pout = pkt->data; + + for (i = 0; i < fbdev->height; i++) { + memcpy(pout, pin, fbdev->frame_linesize); + pin += fbdev->fixinfo.line_length; + pout += fbdev->frame_linesize; + } + + return fbdev->frame_size; +} + +static av_cold int fbdev_read_close(AVFormatContext *avctx) +{ + FBDevContext *fbdev = avctx->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 DEC AV_OPT_FLAG_DECODING_PARAM +static const AVOption options[] = { + { "framerate","", OFFSET(framerate_q), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC }, + { NULL }, +}; + +static const AVClass fbdev_class = { + .class_name = "fbdev indev", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, + .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT, +}; + +AVInputFormat ff_fbdev_demuxer = { + .name = "fbdev", + .long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"), + .priv_data_size = sizeof(FBDevContext), + .read_header = fbdev_read_header, + .read_packet = fbdev_read_packet, + .read_close = fbdev_read_close, + .get_device_list = fbdev_get_device_list, + .flags = AVFMT_NOFILE, + .priv_class = &fbdev_class, +}; |