mirror of https://github.com/FFmpeg/FFmpeg.git
Stefano Sabatini
14 years ago
committed by
Anton Khirnov
parent
364cbc346b
commit
c6f951442e
7 changed files with 281 additions and 1 deletions
@ -0,0 +1,250 @@ |
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/*
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* Copyright (c) 2011 Stefano Sabatini |
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* Copyright (c) 2009 Giliard B. de Freitas <giliarde@gmail.com> |
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* Copyright (C) 2002 Gunnar Monell <gmo@linux.nu> |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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/**
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* @file |
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* Linux framebuffer input device, |
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* inspired by code from fbgrab.c by Gunnar Monell. |
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* See also http://linux-fbdev.sourceforge.net/.
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*/ |
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/* #define DEBUG */ |
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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/time.h> |
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#include <sys/mman.h> |
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#include <time.h> |
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#include <linux/fb.h> |
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#include "libavutil/mem.h" |
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#include "libavutil/pixdesc.h" |
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#include "libavformat/avformat.h" |
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struct rgb_pixfmt_map_entry { |
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int bits_per_pixel; |
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int red_offset, green_offset, blue_offset, alpha_offset; |
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enum PixelFormat pixfmt; |
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}; |
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static struct rgb_pixfmt_map_entry rgb_pixfmt_map[] = { |
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// bpp, red_offset, green_offset, blue_offset, alpha_offset, pixfmt
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{ 32, 0, 8, 16, 24, PIX_FMT_RGBA }, |
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{ 32, 16, 8, 0, 24, PIX_FMT_BGRA }, |
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{ 32, 8, 16, 24, 0, PIX_FMT_ARGB }, |
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{ 32, 3, 2, 8, 0, PIX_FMT_ABGR }, |
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{ 24, 0, 8, 16, 0, PIX_FMT_RGB24 }, |
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{ 24, 16, 8, 0, 0, PIX_FMT_BGR24 }, |
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}; |
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static enum PixelFormat get_pixfmt_from_fb_varinfo(struct fb_var_screeninfo *varinfo) |
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{ |
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int i; |
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for (i = 0; i < FF_ARRAY_ELEMS(rgb_pixfmt_map); i++) { |
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struct rgb_pixfmt_map_entry *entry = &rgb_pixfmt_map[i]; |
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if (entry->bits_per_pixel == varinfo->bits_per_pixel && |
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entry->red_offset == varinfo->red.offset && |
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entry->green_offset == varinfo->green.offset && |
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entry->blue_offset == varinfo->blue.offset) |
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return entry->pixfmt; |
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} |
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return PIX_FMT_NONE; |
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} |
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typedef struct { |
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int frame_size; ///< size in bytes of a grabbed frame
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AVRational time_base; ///< time base
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int64_t time_frame; ///< time for the next frame to output (in 1/1000000 units)
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int fd; ///< framebuffer device file descriptor
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int width, heigth; ///< assumed frame resolution
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int frame_linesize; ///< linesize of the output frame, it is assumed to be constant
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int bytes_per_pixel; |
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struct fb_var_screeninfo varinfo; ///< variable info;
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struct fb_fix_screeninfo fixinfo; ///< fixed info;
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uint8_t *data; ///< framebuffer data
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} FBDevContext; |
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av_cold static int fbdev_read_header(AVFormatContext *avctx, |
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AVFormatParameters *ap) |
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{ |
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FBDevContext *fbdev = avctx->priv_data; |
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AVStream *st = NULL; |
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enum PixelFormat pix_fmt; |
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int ret, flags = O_RDONLY; |
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if (!(st = av_new_stream(avctx, 0))) |
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return AVERROR(ENOMEM); |
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av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in microseconds */ |
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if (ap->time_base.den <= 0) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid time base %d/%d\n", |
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ap->time_base.num, ap->time_base.den); |
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return AVERROR(EINVAL); |
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} |
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/* NONBLOCK is ignored by the fbdev driver, only set for consistency */ |
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if (avctx->flags & AVFMT_FLAG_NONBLOCK) |
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flags |= O_NONBLOCK; |
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if ((fbdev->fd = open(avctx->filename, flags)) == -1) { |
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ret = AVERROR(errno); |
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av_log(avctx, AV_LOG_ERROR, |
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"Could not open framebuffer device '%s': %s\n", |
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avctx->filename, strerror(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(avctx, AV_LOG_ERROR, |
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"FBIOGET_VSCREENINFO: %s\n", strerror(errno)); |
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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(avctx, AV_LOG_ERROR, |
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"FBIOGET_FSCREENINFO: %s\n", strerror(errno)); |
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goto fail; |
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} |
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pix_fmt = get_pixfmt_from_fb_varinfo(&fbdev->varinfo); |
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if (pix_fmt == PIX_FMT_NONE) { |
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ret = AVERROR(EINVAL); |
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av_log(avctx, AV_LOG_ERROR, |
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"Framebuffer pixel format not supported.\n"); |
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goto fail; |
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} |
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fbdev->width = fbdev->varinfo.xres; |
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fbdev->heigth = fbdev->varinfo.yres; |
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fbdev->bytes_per_pixel = (fbdev->varinfo.bits_per_pixel + 7) >> 3; |
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fbdev->frame_linesize = fbdev->width * fbdev->bytes_per_pixel; |
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fbdev->frame_size = fbdev->frame_linesize * fbdev->heigth; |
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fbdev->time_base = ap->time_base; |
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fbdev->time_frame = AV_NOPTS_VALUE; |
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fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_READ, 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(avctx, AV_LOG_ERROR, "Error in mmap(): %s\n", strerror(errno)); |
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goto fail; |
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} |
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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st->codec->codec_id = CODEC_ID_RAWVIDEO; |
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st->codec->width = fbdev->width; |
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st->codec->height = fbdev->heigth; |
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st->codec->pix_fmt = pix_fmt; |
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st->codec->time_base = ap->time_base; |
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st->codec->bit_rate = |
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fbdev->width * fbdev->heigth * fbdev->bytes_per_pixel / av_q2d(ap->time_base) * 8; |
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av_log(avctx, AV_LOG_INFO, |
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"w:%d h:%d bpp:%d pixfmt:%s tb:%d/%d bit_rate:%d\n", |
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fbdev->width, fbdev->heigth, fbdev->varinfo.bits_per_pixel, |
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av_pix_fmt_descriptors[pix_fmt].name, |
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ap->time_base.num, ap->time_base.den, |
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st->codec->bit_rate); |
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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_read_packet(AVFormatContext *avctx, AVPacket *pkt) |
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{ |
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FBDevContext *fbdev = avctx->priv_data; |
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int64_t curtime, delay; |
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struct timespec ts; |
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int i, ret; |
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uint8_t *pin, *pout; |
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if (fbdev->time_frame == AV_NOPTS_VALUE) |
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fbdev->time_frame = av_gettime(); |
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/* wait based on the frame rate */ |
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curtime = av_gettime(); |
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delay = fbdev->time_frame - curtime; |
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av_dlog(avctx, |
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"time_frame:%"PRId64" curtime:%"PRId64" delay:%"PRId64"\n", |
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fbdev->time_frame, curtime, delay); |
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if (delay > 0) { |
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if (avctx->flags & AVFMT_FLAG_NONBLOCK) |
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return AVERROR(EAGAIN); |
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ts.tv_sec = delay / 1000000; |
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ts.tv_nsec = (delay % 1000000) * 1000; |
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while (nanosleep(&ts, &ts) < 0 && errno == EINTR); |
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} |
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/* compute the time of the next frame */ |
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fbdev->time_frame += INT64_C(1000000) * av_q2d(fbdev->time_base); |
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if ((ret = av_new_packet(pkt, fbdev->frame_size)) < 0) |
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return ret; |
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/* refresh fbdev->varinfo, visible data position may change at each call */ |
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if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) |
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av_log(avctx, AV_LOG_WARNING, |
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"Error refreshing variable info: %s\n", strerror(errno)); |
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pkt->pts = curtime; |
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/* compute visible data offset */ |
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pin = fbdev->data + fbdev->bytes_per_pixel * fbdev->varinfo.xoffset + |
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fbdev->varinfo.yoffset * fbdev->fixinfo.line_length; |
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pout = pkt->data; |
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// TODO it'd be nice if the lines were aligned
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for (i = 0; i < fbdev->heigth; i++) { |
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memcpy(pout, pin, fbdev->frame_linesize); |
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pin += fbdev->fixinfo.line_length; |
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pout += fbdev->frame_linesize; |
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} |
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return fbdev->frame_size; |
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} |
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av_cold static int fbdev_read_close(AVFormatContext *avctx) |
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{ |
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FBDevContext *fbdev = avctx->priv_data; |
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munmap(fbdev->data, fbdev->frame_size); |
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close(fbdev->fd); |
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return 0; |
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} |
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AVInputFormat ff_fbdev_demuxer = { |
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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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.read_header = fbdev_read_header, |
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.read_packet = fbdev_read_packet, |
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.read_close = fbdev_read_close, |
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.flags = AVFMT_NOFILE, |
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}; |
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