FFmpeg coverage

Directory:	../../../ffmpeg/
File:	src/libavdevice/fbdev_dec.c
Date:	2025-11-15 05:41:04

	Total	Coverage
Lines:	93	0.0%
Functions:	4	0.0%
Branches:	32	0.0%

  
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      /*
    
       * 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/file_open.h"
    
      #include "libavutil/internal.h"
    
      #include "libavutil/log.h"
    
      #include "libavutil/opt.h"
    
      #include "libavutil/time.h"
    
      #include "libavutil/parseutils.h"
    
      #include "libavutil/pixdesc.h"
    
      #include "libavformat/demux.h"
    
      #include "libavformat/internal.h"
    
      #include "avdevice.h"
    
      #include "fbdev_common.h"
    
      typedef struct FBDevContext {
    
          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;
    
          const char* device;
    
      ✗
          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 (avctx->url[0])
    
      ✗
              device = avctx->url;
    
          else
    
      ✗
              device = ff_fbdev_default_device();
    
      ✗
          if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
    
      ✗
              ret = AVERROR(errno);
    
      ✗
              av_log(avctx, 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(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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
    
      ✗
          st->codecpar->codec_id   = AV_CODEC_ID_RAWVIDEO;
    
      ✗
          st->codecpar->width      = fbdev->width;
    
      ✗
          st->codecpar->height     = fbdev->height;
    
      ✗
          st->codecpar->format     = pix_fmt;
    
      ✗
          st->avg_frame_rate       = fbdev->framerate_q;
    
      ✗
          st->codecpar->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:%"PRId64"\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->codecpar->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_relative();
    
          /* wait based on the frame rate */
    
          while (1) {
    
      ✗
              curtime = av_gettime_relative();
    
      ✗
              delay = fbdev->time_frame - curtime;
    
      ✗
              av_log(avctx, AV_LOG_TRACE,
    
                      "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(AVERROR(errno)));
    
          }
    
      ✗
          pkt->pts = av_gettime();
    
          /* 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, INT_MAX, 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,
    
      };
    
      const FFInputFormat ff_fbdev_demuxer = {
    
          .p.name          = "fbdev",
    
          .p.long_name     = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
    
          .p.flags         = AVFMT_NOFILE,
    
          .p.priv_class    = &fbdev_class,
    
          .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,
    
      };

Line	Exec	Source
1		/*
2		* Copyright (c) 2011 Stefano Sabatini
3		* Copyright (c) 2009 Giliard B. de Freitas <giliarde@gmail.com>
4		* Copyright (C) 2002 Gunnar Monell <gmo@linux.nu>
5		*
6		* This file is part of FFmpeg.
7		*
8		* FFmpeg is free software; you can redistribute it and/or
9		* modify it under the terms of the GNU Lesser General Public
10		* License as published by the Free Software Foundation; either
11		* version 2.1 of the License, or (at your option) any later version.
12		*
13		* FFmpeg is distributed in the hope that it will be useful,
14		* but WITHOUT ANY WARRANTY; without even the implied warranty of
15		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16		* Lesser General Public License for more details.
17		*
18		* You should have received a copy of the GNU Lesser General Public
19		* License along with FFmpeg; if not, write to the Free Software
20		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21		*/
22
23		/**
24		* @file
25		* Linux framebuffer input device,
26		* inspired by code from fbgrab.c by Gunnar Monell.
27		* @see http://linux-fbdev.sourceforge.net/
28		*/
29
30		#include <unistd.h>
31		#include <fcntl.h>
32		#include <sys/ioctl.h>
33		#include <sys/mman.h>
34		#include <time.h>
35		#include <linux/fb.h>
36
37		#include "libavutil/file_open.h"
38		#include "libavutil/internal.h"
39		#include "libavutil/log.h"
40		#include "libavutil/opt.h"
41		#include "libavutil/time.h"
42		#include "libavutil/parseutils.h"
43		#include "libavutil/pixdesc.h"
44		#include "libavformat/demux.h"
45		#include "libavformat/internal.h"
46		#include "avdevice.h"
47		#include "fbdev_common.h"
48
49		typedef struct FBDevContext {
50		AVClass *class; ///< class for private options
51		int frame_size; ///< size in bytes of a grabbed frame
52		AVRational framerate_q; ///< framerate
53		int64_t time_frame; ///< time for the next frame to output (in 1/1000000 units)
54
55		int fd; ///< framebuffer device file descriptor
56		int width, height; ///< assumed frame resolution
57		int frame_linesize; ///< linesize of the output frame, it is assumed to be constant
58		int bytes_per_pixel;
59
60		struct fb_var_screeninfo varinfo; ///< variable info;
61		struct fb_fix_screeninfo fixinfo; ///< fixed info;
62
63		uint8_t *data; ///< framebuffer data
64		} FBDevContext;
65
66	✗	static av_cold int fbdev_read_header(AVFormatContext *avctx)
67		{
68	✗	FBDevContext *fbdev = avctx->priv_data;
69	✗	AVStream *st = NULL;
70		enum AVPixelFormat pix_fmt;
71	✗	int ret, flags = O_RDONLY;
72		const char* device;
73
74	✗	if (!(st = avformat_new_stream(avctx, NULL)))
75	✗	return AVERROR(ENOMEM);
76	✗	avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in microseconds */
77
78		/* NONBLOCK is ignored by the fbdev driver, only set for consistency */
79	✗	if (avctx->flags & AVFMT_FLAG_NONBLOCK)
80	✗	flags \|= O_NONBLOCK;
81
82	✗	if (avctx->url[0])
83	✗	device = avctx->url;
84		else
85	✗	device = ff_fbdev_default_device();
86
87	✗	if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
88	✗	ret = AVERROR(errno);
89	✗	av_log(avctx, AV_LOG_ERROR,
90		"Could not open framebuffer device '%s': %s\n",
91	✗	device, av_err2str(ret));
92	✗	return ret;
93		}
94
95	✗	if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
96	✗	ret = AVERROR(errno);
97	✗	av_log(avctx, AV_LOG_ERROR,
98	✗	"FBIOGET_VSCREENINFO: %s\n", av_err2str(ret));
99	✗	goto fail;
100		}
101
102	✗	if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
103	✗	ret = AVERROR(errno);
104	✗	av_log(avctx, AV_LOG_ERROR,
105	✗	"FBIOGET_FSCREENINFO: %s\n", av_err2str(ret));
106	✗	goto fail;
107		}
108
109	✗	pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
110	✗	if (pix_fmt == AV_PIX_FMT_NONE) {
111	✗	ret = AVERROR(EINVAL);
112	✗	av_log(avctx, AV_LOG_ERROR,
113		"Framebuffer pixel format not supported.\n");
114	✗	goto fail;
115		}
116
117	✗	fbdev->width = fbdev->varinfo.xres;
118	✗	fbdev->height = fbdev->varinfo.yres;
119	✗	fbdev->bytes_per_pixel = (fbdev->varinfo.bits_per_pixel + 7) >> 3;
120	✗	fbdev->frame_linesize = fbdev->width * fbdev->bytes_per_pixel;
121	✗	fbdev->frame_size = fbdev->frame_linesize * fbdev->height;
122	✗	fbdev->time_frame = AV_NOPTS_VALUE;
123	✗	fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_READ, MAP_SHARED, fbdev->fd, 0);
124	✗	if (fbdev->data == MAP_FAILED) {
125	✗	ret = AVERROR(errno);
126	✗	av_log(avctx, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret));
127	✗	goto fail;
128		}
129
130	✗	st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
131	✗	st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
132	✗	st->codecpar->width = fbdev->width;
133	✗	st->codecpar->height = fbdev->height;
134	✗	st->codecpar->format = pix_fmt;
135	✗	st->avg_frame_rate = fbdev->framerate_q;
136	✗	st->codecpar->bit_rate =
137	✗	fbdev->width * fbdev->height * fbdev->bytes_per_pixel * av_q2d(fbdev->framerate_q) * 8;
138
139	✗	av_log(avctx, AV_LOG_INFO,
140		"w:%d h:%d bpp:%d pixfmt:%s fps:%d/%d bit_rate:%"PRId64"\n",
141		fbdev->width, fbdev->height, fbdev->varinfo.bits_per_pixel,
142		av_get_pix_fmt_name(pix_fmt),
143		fbdev->framerate_q.num, fbdev->framerate_q.den,
144	✗	st->codecpar->bit_rate);
145	✗	return 0;
146
147	✗	fail:
148	✗	close(fbdev->fd);
149	✗	return ret;
150		}
151
152	✗	static int fbdev_read_packet(AVFormatContext avctx, AVPacket pkt)
153		{
154	✗	FBDevContext *fbdev = avctx->priv_data;
155		int64_t curtime, delay;
156		struct timespec ts;
157		int i, ret;
158		uint8_t pin, pout;
159
160	✗	if (fbdev->time_frame == AV_NOPTS_VALUE)
161	✗	fbdev->time_frame = av_gettime_relative();
162
163		/* wait based on the frame rate */
164		while (1) {
165	✗	curtime = av_gettime_relative();
166	✗	delay = fbdev->time_frame - curtime;
167	✗	av_log(avctx, AV_LOG_TRACE,
168		"time_frame:%"PRId64" curtime:%"PRId64" delay:%"PRId64"\n",
169		fbdev->time_frame, curtime, delay);
170	✗	if (delay <= 0) {
171	✗	fbdev->time_frame += INT64_C(1000000) / av_q2d(fbdev->framerate_q);
172	✗	break;
173		}
174	✗	if (avctx->flags & AVFMT_FLAG_NONBLOCK)
175	✗	return AVERROR(EAGAIN);
176	✗	ts.tv_sec = delay / 1000000;
177	✗	ts.tv_nsec = (delay % 1000000) * 1000;
178	✗	while (nanosleep(&ts, &ts) < 0 && errno == EINTR);
179		}
180
181	✗	if ((ret = av_new_packet(pkt, fbdev->frame_size)) < 0)
182	✗	return ret;
183
184		/* refresh fbdev->varinfo, visible data position may change at each call */
185	✗	if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
186	✗	av_log(avctx, AV_LOG_WARNING,
187	✗	"Error refreshing variable info: %s\n", av_err2str(AVERROR(errno)));
188		}
189
190	✗	pkt->pts = av_gettime();
191
192		/* compute visible data offset */
193	✗	pin = fbdev->data + fbdev->bytes_per_pixel * fbdev->varinfo.xoffset +
194	✗	fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
195	✗	pout = pkt->data;
196
197	✗	for (i = 0; i < fbdev->height; i++) {
198	✗	memcpy(pout, pin, fbdev->frame_linesize);
199	✗	pin += fbdev->fixinfo.line_length;
200	✗	pout += fbdev->frame_linesize;
201		}
202
203	✗	return fbdev->frame_size;
204		}
205
206	✗	static av_cold int fbdev_read_close(AVFormatContext *avctx)
207		{
208	✗	FBDevContext *fbdev = avctx->priv_data;
209
210	✗	munmap(fbdev->data, fbdev->fixinfo.smem_len);
211	✗	close(fbdev->fd);
212
213	✗	return 0;
214		}
215
216	✗	static int fbdev_get_device_list(AVFormatContext s, AVDeviceInfoList device_list)
217		{
218	✗	return ff_fbdev_get_device_list(device_list);
219		}
220
221		#define OFFSET(x) offsetof(FBDevContext, x)
222		#define DEC AV_OPT_FLAG_DECODING_PARAM
223		static const AVOption options[] = {
224		{ "framerate","", OFFSET(framerate_q), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC },
225		{ NULL },
226		};
227
228		static const AVClass fbdev_class = {
229		.class_name = "fbdev indev",
230		.item_name = av_default_item_name,
231		.option = options,
232		.version = LIBAVUTIL_VERSION_INT,
233		.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
234		};
235
236		const FFInputFormat ff_fbdev_demuxer = {
237		.p.name = "fbdev",
238		.p.long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
239		.p.flags = AVFMT_NOFILE,
240		.p.priv_class = &fbdev_class,
241		.priv_data_size = sizeof(FBDevContext),
242		.read_header = fbdev_read_header,
243		.read_packet = fbdev_read_packet,
244		.read_close = fbdev_read_close,
245		.get_device_list = fbdev_get_device_list,
246		};
247

Function (Line)	Call count	Block coverage
fbdev_get_device_list (line 216)	not called	0.0%
fbdev_read_close (line 206)	not called	0.0%
fbdev_read_header (line 66)	not called	0.0%
fbdev_read_packet (line 152)	not called	0.0%