LCOV - code coverage report
Current view: top level - src/libavdevice - v4l2.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 3 536 0.6 %
Date: 2017-01-19 23:52:33 Functions: 1 23 4.3 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2000,2001 Fabrice Bellard
       3             :  * Copyright (c) 2006 Luca Abeni
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * Video4Linux2 grab interface
      25             :  *
      26             :  * Part of this file is based on the V4L2 video capture example
      27             :  * (http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html)
      28             :  *
      29             :  * Thanks to Michael Niedermayer for providing the mapping between
      30             :  * V4L2_PIX_FMT_* and AV_PIX_FMT_*
      31             :  */
      32             : 
      33             : #include "v4l2-common.h"
      34             : #include <dirent.h>
      35             : 
      36             : #if CONFIG_LIBV4L2
      37             : #include <libv4l2.h>
      38             : #endif
      39             : 
      40             : static const int desired_video_buffers = 256;
      41             : 
      42             : #define V4L_ALLFORMATS  3
      43             : #define V4L_RAWFORMATS  1
      44             : #define V4L_COMPFORMATS 2
      45             : 
      46             : /**
      47             :  * Return timestamps to the user exactly as returned by the kernel
      48             :  */
      49             : #define V4L_TS_DEFAULT  0
      50             : /**
      51             :  * Autodetect the kind of timestamps returned by the kernel and convert to
      52             :  * absolute (wall clock) timestamps.
      53             :  */
      54             : #define V4L_TS_ABS      1
      55             : /**
      56             :  * Assume kernel timestamps are from the monotonic clock and convert to
      57             :  * absolute timestamps.
      58             :  */
      59             : #define V4L_TS_MONO2ABS 2
      60             : 
      61             : /**
      62             :  * Once the kind of timestamps returned by the kernel have been detected,
      63             :  * the value of the timefilter (NULL or not) determines whether a conversion
      64             :  * takes place.
      65             :  */
      66             : #define V4L_TS_CONVERT_READY V4L_TS_DEFAULT
      67             : 
      68             : struct video_data {
      69             :     AVClass *class;
      70             :     int fd;
      71             :     int pixelformat; /* V4L2_PIX_FMT_* */
      72             :     int width, height;
      73             :     int frame_size;
      74             :     int interlaced;
      75             :     int top_field_first;
      76             :     int ts_mode;
      77             :     TimeFilter *timefilter;
      78             :     int64_t last_time_m;
      79             : 
      80             :     int buffers;
      81             :     volatile int buffers_queued;
      82             :     void **buf_start;
      83             :     unsigned int *buf_len;
      84             :     char *standard;
      85             :     v4l2_std_id std_id;
      86             :     int channel;
      87             :     char *pixel_format; /**< Set by a private option. */
      88             :     int list_format;    /**< Set by a private option. */
      89             :     int list_standard;  /**< Set by a private option. */
      90             :     char *framerate;    /**< Set by a private option. */
      91             : 
      92             :     int use_libv4l2;
      93             :     int (*open_f)(const char *file, int oflag, ...);
      94             :     int (*close_f)(int fd);
      95             :     int (*dup_f)(int fd);
      96             :     int (*ioctl_f)(int fd, unsigned long int request, ...);
      97             :     ssize_t (*read_f)(int fd, void *buffer, size_t n);
      98             :     void *(*mmap_f)(void *start, size_t length, int prot, int flags, int fd, int64_t offset);
      99             :     int (*munmap_f)(void *_start, size_t length);
     100             : };
     101             : 
     102             : struct buff_data {
     103             :     struct video_data *s;
     104             :     int index;
     105             : };
     106             : 
     107           0 : static int device_open(AVFormatContext *ctx)
     108             : {
     109           0 :     struct video_data *s = ctx->priv_data;
     110             :     struct v4l2_capability cap;
     111             :     int fd;
     112             :     int err;
     113           0 :     int flags = O_RDWR;
     114             : 
     115             : #define SET_WRAPPERS(prefix) do {       \
     116             :     s->open_f   = prefix ## open;       \
     117             :     s->close_f  = prefix ## close;      \
     118             :     s->dup_f    = prefix ## dup;        \
     119             :     s->ioctl_f  = prefix ## ioctl;      \
     120             :     s->read_f   = prefix ## read;       \
     121             :     s->mmap_f   = prefix ## mmap;       \
     122             :     s->munmap_f = prefix ## munmap;     \
     123             : } while (0)
     124             : 
     125           0 :     if (s->use_libv4l2) {
     126             : #if CONFIG_LIBV4L2
     127             :         SET_WRAPPERS(v4l2_);
     128             : #else
     129           0 :         av_log(ctx, AV_LOG_ERROR, "libavdevice is not built with libv4l2 support.\n");
     130           0 :         return AVERROR(EINVAL);
     131             : #endif
     132             :     } else {
     133           0 :         SET_WRAPPERS();
     134             :     }
     135             : 
     136             : #define v4l2_open   s->open_f
     137             : #define v4l2_close  s->close_f
     138             : #define v4l2_dup    s->dup_f
     139             : #define v4l2_ioctl  s->ioctl_f
     140             : #define v4l2_read   s->read_f
     141             : #define v4l2_mmap   s->mmap_f
     142             : #define v4l2_munmap s->munmap_f
     143             : 
     144           0 :     if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
     145           0 :         flags |= O_NONBLOCK;
     146             :     }
     147             : 
     148           0 :     fd = v4l2_open(ctx->filename, flags, 0);
     149           0 :     if (fd < 0) {
     150           0 :         err = AVERROR(errno);
     151           0 :         av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s: %s\n",
     152           0 :                ctx->filename, av_err2str(err));
     153           0 :         return err;
     154             :     }
     155             : 
     156           0 :     if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
     157           0 :         err = AVERROR(errno);
     158           0 :         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
     159           0 :                av_err2str(err));
     160           0 :         goto fail;
     161             :     }
     162             : 
     163           0 :     av_log(ctx, AV_LOG_VERBOSE, "fd:%d capabilities:%x\n",
     164             :            fd, cap.capabilities);
     165             : 
     166           0 :     if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
     167           0 :         av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
     168           0 :         err = AVERROR(ENODEV);
     169           0 :         goto fail;
     170             :     }
     171             : 
     172           0 :     if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
     173           0 :         av_log(ctx, AV_LOG_ERROR,
     174             :                "The device does not support the streaming I/O method.\n");
     175           0 :         err = AVERROR(ENOSYS);
     176           0 :         goto fail;
     177             :     }
     178             : 
     179           0 :     return fd;
     180             : 
     181             : fail:
     182           0 :     v4l2_close(fd);
     183           0 :     return err;
     184             : }
     185             : 
     186           0 : static int device_init(AVFormatContext *ctx, int *width, int *height,
     187             :                        uint32_t pixelformat)
     188             : {
     189           0 :     struct video_data *s = ctx->priv_data;
     190           0 :     struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
     191           0 :     int res = 0;
     192             : 
     193           0 :     fmt.fmt.pix.width = *width;
     194           0 :     fmt.fmt.pix.height = *height;
     195           0 :     fmt.fmt.pix.pixelformat = pixelformat;
     196           0 :     fmt.fmt.pix.field = V4L2_FIELD_ANY;
     197             : 
     198             :     /* Some drivers will fail and return EINVAL when the pixelformat
     199             :        is not supported (even if type field is valid and supported) */
     200           0 :     if (v4l2_ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0)
     201           0 :         res = AVERROR(errno);
     202             : 
     203           0 :     if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
     204           0 :         av_log(ctx, AV_LOG_INFO,
     205             :                "The V4L2 driver changed the video from %dx%d to %dx%d\n",
     206             :                *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
     207           0 :         *width = fmt.fmt.pix.width;
     208           0 :         *height = fmt.fmt.pix.height;
     209             :     }
     210             : 
     211           0 :     if (pixelformat != fmt.fmt.pix.pixelformat) {
     212           0 :         av_log(ctx, AV_LOG_DEBUG,
     213             :                "The V4L2 driver changed the pixel format "
     214             :                "from 0x%08X to 0x%08X\n",
     215             :                pixelformat, fmt.fmt.pix.pixelformat);
     216           0 :         res = AVERROR(EINVAL);
     217             :     }
     218             : 
     219           0 :     if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
     220           0 :         av_log(ctx, AV_LOG_DEBUG,
     221             :                "The V4L2 driver is using the interlaced mode\n");
     222           0 :         s->interlaced = 1;
     223             :     }
     224             : 
     225           0 :     return res;
     226             : }
     227             : 
     228           0 : static int first_field(const struct video_data *s)
     229             : {
     230             :     int res;
     231             :     v4l2_std_id std;
     232             : 
     233           0 :     res = v4l2_ioctl(s->fd, VIDIOC_G_STD, &std);
     234           0 :     if (res < 0)
     235           0 :         return 0;
     236           0 :     if (std & V4L2_STD_NTSC)
     237           0 :         return 0;
     238             : 
     239           0 :     return 1;
     240             : }
     241             : 
     242             : #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
     243           0 : static void list_framesizes(AVFormatContext *ctx, uint32_t pixelformat)
     244             : {
     245           0 :     const struct video_data *s = ctx->priv_data;
     246           0 :     struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
     247             : 
     248           0 :     while(!v4l2_ioctl(s->fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
     249           0 :         switch (vfse.type) {
     250             :         case V4L2_FRMSIZE_TYPE_DISCRETE:
     251           0 :             av_log(ctx, AV_LOG_INFO, " %ux%u",
     252             :                    vfse.discrete.width, vfse.discrete.height);
     253           0 :         break;
     254             :         case V4L2_FRMSIZE_TYPE_CONTINUOUS:
     255             :         case V4L2_FRMSIZE_TYPE_STEPWISE:
     256           0 :             av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
     257             :                    vfse.stepwise.min_width,
     258             :                    vfse.stepwise.max_width,
     259             :                    vfse.stepwise.step_width,
     260             :                    vfse.stepwise.min_height,
     261             :                    vfse.stepwise.max_height,
     262             :                    vfse.stepwise.step_height);
     263             :         }
     264           0 :         vfse.index++;
     265             :     }
     266           0 : }
     267             : #endif
     268             : 
     269           0 : static void list_formats(AVFormatContext *ctx, int type)
     270             : {
     271           0 :     const struct video_data *s = ctx->priv_data;
     272           0 :     struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
     273             : 
     274           0 :     while(!v4l2_ioctl(s->fd, VIDIOC_ENUM_FMT, &vfd)) {
     275           0 :         enum AVCodecID codec_id = ff_fmt_v4l2codec(vfd.pixelformat);
     276           0 :         enum AVPixelFormat pix_fmt = ff_fmt_v4l2ff(vfd.pixelformat, codec_id);
     277             : 
     278           0 :         vfd.index++;
     279             : 
     280           0 :         if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
     281           0 :             type & V4L_RAWFORMATS) {
     282           0 :             const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
     283           0 :             av_log(ctx, AV_LOG_INFO, "Raw       : %11s : %20s :",
     284             :                    fmt_name ? fmt_name : "Unsupported",
     285             :                    vfd.description);
     286           0 :         } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
     287           0 :                    type & V4L_COMPFORMATS) {
     288           0 :             const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
     289           0 :             av_log(ctx, AV_LOG_INFO, "Compressed: %11s : %20s :",
     290             :                    desc ? desc->name : "Unsupported",
     291             :                    vfd.description);
     292             :         } else {
     293           0 :             continue;
     294             :         }
     295             : 
     296             : #ifdef V4L2_FMT_FLAG_EMULATED
     297           0 :         if (vfd.flags & V4L2_FMT_FLAG_EMULATED)
     298           0 :             av_log(ctx, AV_LOG_INFO, " Emulated :");
     299             : #endif
     300             : #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
     301           0 :         list_framesizes(ctx, vfd.pixelformat);
     302             : #endif
     303           0 :         av_log(ctx, AV_LOG_INFO, "\n");
     304             :     }
     305           0 : }
     306             : 
     307           0 : static void list_standards(AVFormatContext *ctx)
     308             : {
     309             :     int ret;
     310           0 :     struct video_data *s = ctx->priv_data;
     311             :     struct v4l2_standard standard;
     312             : 
     313           0 :     if (s->std_id == 0)
     314           0 :         return;
     315             : 
     316           0 :     for (standard.index = 0; ; standard.index++) {
     317           0 :         if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
     318           0 :             ret = AVERROR(errno);
     319           0 :             if (ret == AVERROR(EINVAL)) {
     320           0 :                 break;
     321             :             } else {
     322           0 :                 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
     323           0 :                 return;
     324             :             }
     325             :         }
     326           0 :         av_log(ctx, AV_LOG_INFO, "%2d, %16"PRIx64", %s\n",
     327           0 :                standard.index, (uint64_t)standard.id, standard.name);
     328             :     }
     329             : }
     330             : 
     331           0 : static int mmap_init(AVFormatContext *ctx)
     332             : {
     333             :     int i, res;
     334           0 :     struct video_data *s = ctx->priv_data;
     335           0 :     struct v4l2_requestbuffers req = {
     336             :         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
     337             :         .count  = desired_video_buffers,
     338             :         .memory = V4L2_MEMORY_MMAP
     339             :     };
     340             : 
     341           0 :     if (v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req) < 0) {
     342           0 :         res = AVERROR(errno);
     343           0 :         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS): %s\n", av_err2str(res));
     344           0 :         return res;
     345             :     }
     346             : 
     347           0 :     if (req.count < 2) {
     348           0 :         av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
     349           0 :         return AVERROR(ENOMEM);
     350             :     }
     351           0 :     s->buffers = req.count;
     352           0 :     s->buf_start = av_malloc_array(s->buffers, sizeof(void *));
     353           0 :     if (!s->buf_start) {
     354           0 :         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
     355           0 :         return AVERROR(ENOMEM);
     356             :     }
     357           0 :     s->buf_len = av_malloc_array(s->buffers, sizeof(unsigned int));
     358           0 :     if (!s->buf_len) {
     359           0 :         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
     360           0 :         av_freep(&s->buf_start);
     361           0 :         return AVERROR(ENOMEM);
     362             :     }
     363             : 
     364           0 :     for (i = 0; i < req.count; i++) {
     365           0 :         struct v4l2_buffer buf = {
     366             :             .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
     367             :             .index  = i,
     368             :             .memory = V4L2_MEMORY_MMAP
     369             :         };
     370           0 :         if (v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf) < 0) {
     371           0 :             res = AVERROR(errno);
     372           0 :             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF): %s\n", av_err2str(res));
     373           0 :             return res;
     374             :         }
     375             : 
     376           0 :         s->buf_len[i] = buf.length;
     377           0 :         if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
     378           0 :             av_log(ctx, AV_LOG_ERROR,
     379             :                    "buf_len[%d] = %d < expected frame size %d\n",
     380           0 :                    i, s->buf_len[i], s->frame_size);
     381           0 :             return AVERROR(ENOMEM);
     382             :         }
     383           0 :         s->buf_start[i] = v4l2_mmap(NULL, buf.length,
     384             :                                PROT_READ | PROT_WRITE, MAP_SHARED,
     385           0 :                                s->fd, buf.m.offset);
     386             : 
     387           0 :         if (s->buf_start[i] == MAP_FAILED) {
     388           0 :             res = AVERROR(errno);
     389           0 :             av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", av_err2str(res));
     390           0 :             return res;
     391             :         }
     392             :     }
     393             : 
     394           0 :     return 0;
     395             : }
     396             : 
     397           0 : static int enqueue_buffer(struct video_data *s, struct v4l2_buffer *buf)
     398             : {
     399           0 :     int res = 0;
     400             : 
     401           0 :     if (v4l2_ioctl(s->fd, VIDIOC_QBUF, buf) < 0) {
     402           0 :         res = AVERROR(errno);
     403           0 :         av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res));
     404             :     } else {
     405           0 :         avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
     406             :     }
     407             : 
     408           0 :     return res;
     409             : }
     410             : 
     411           0 : static void mmap_release_buffer(void *opaque, uint8_t *data)
     412             : {
     413           0 :     struct v4l2_buffer buf = { 0 };
     414           0 :     struct buff_data *buf_descriptor = opaque;
     415           0 :     struct video_data *s = buf_descriptor->s;
     416             : 
     417           0 :     buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
     418           0 :     buf.memory = V4L2_MEMORY_MMAP;
     419           0 :     buf.index = buf_descriptor->index;
     420           0 :     av_free(buf_descriptor);
     421             : 
     422           0 :     enqueue_buffer(s, &buf);
     423           0 : }
     424             : 
     425             : #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
     426           0 : static int64_t av_gettime_monotonic(void)
     427             : {
     428           0 :     return av_gettime_relative();
     429             : }
     430             : #endif
     431             : 
     432           0 : static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts)
     433             : {
     434           0 :     struct video_data *s = ctx->priv_data;
     435             :     int64_t now;
     436             : 
     437           0 :     now = av_gettime();
     438           0 :     if (s->ts_mode == V4L_TS_ABS &&
     439           0 :         ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) {
     440           0 :         av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n");
     441           0 :         s->ts_mode = V4L_TS_CONVERT_READY;
     442           0 :         return 0;
     443             :     }
     444             : #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
     445           0 :     if (ctx->streams[0]->avg_frame_rate.num) {
     446           0 :         now = av_gettime_monotonic();
     447           0 :         if (s->ts_mode == V4L_TS_MONO2ABS ||
     448           0 :             (ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) {
     449           0 :             AVRational tb = {AV_TIME_BASE, 1};
     450           0 :             int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate);
     451           0 :             av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n");
     452             :             /* microseconds instead of seconds, MHz instead of Hz */
     453           0 :             s->timefilter = ff_timefilter_new(1, period, 1.0E-6);
     454           0 :             if (!s->timefilter)
     455           0 :                 return AVERROR(ENOMEM);
     456           0 :             s->ts_mode = V4L_TS_CONVERT_READY;
     457           0 :             return 0;
     458             :         }
     459             :     }
     460             : #endif
     461           0 :     av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n");
     462           0 :     return AVERROR(EIO);
     463             : }
     464             : 
     465           0 : static int convert_timestamp(AVFormatContext *ctx, int64_t *ts)
     466             : {
     467           0 :     struct video_data *s = ctx->priv_data;
     468             : 
     469           0 :     if (s->ts_mode) {
     470           0 :         int r = init_convert_timestamp(ctx, *ts);
     471           0 :         if (r < 0)
     472           0 :             return r;
     473             :     }
     474             : #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
     475           0 :     if (s->timefilter) {
     476           0 :         int64_t nowa = av_gettime();
     477           0 :         int64_t nowm = av_gettime_monotonic();
     478           0 :         ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m);
     479           0 :         s->last_time_m = nowm;
     480           0 :         *ts = ff_timefilter_eval(s->timefilter, *ts - nowm);
     481             :     }
     482             : #endif
     483           0 :     return 0;
     484             : }
     485             : 
     486           0 : static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
     487             : {
     488           0 :     struct video_data *s = ctx->priv_data;
     489           0 :     struct v4l2_buffer buf = {
     490             :         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
     491             :         .memory = V4L2_MEMORY_MMAP
     492             :     };
     493             :     int res;
     494             : 
     495           0 :     pkt->size = 0;
     496             : 
     497             :     /* FIXME: Some special treatment might be needed in case of loss of signal... */
     498           0 :     while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
     499           0 :     if (res < 0) {
     500           0 :         if (errno == EAGAIN)
     501           0 :             return AVERROR(EAGAIN);
     502             : 
     503           0 :         res = AVERROR(errno);
     504           0 :         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
     505           0 :                av_err2str(res));
     506           0 :         return res;
     507             :     }
     508             : 
     509           0 :     if (buf.index >= s->buffers) {
     510           0 :         av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
     511           0 :         return AVERROR(EINVAL);
     512             :     }
     513           0 :     avpriv_atomic_int_add_and_fetch(&s->buffers_queued, -1);
     514             :     // always keep at least one buffer queued
     515           0 :     av_assert0(avpriv_atomic_int_get(&s->buffers_queued) >= 1);
     516             : 
     517             : #ifdef V4L2_BUF_FLAG_ERROR
     518           0 :     if (buf.flags & V4L2_BUF_FLAG_ERROR) {
     519           0 :         av_log(ctx, AV_LOG_WARNING,
     520             :                "Dequeued v4l2 buffer contains corrupted data (%d bytes).\n",
     521             :                buf.bytesused);
     522           0 :         buf.bytesused = 0;
     523             :     } else
     524             : #endif
     525             :     {
     526             :         /* CPIA is a compressed format and we don't know the exact number of bytes
     527             :          * used by a frame, so set it here as the driver announces it. */
     528           0 :         if (ctx->video_codec_id == AV_CODEC_ID_CPIA)
     529           0 :             s->frame_size = buf.bytesused;
     530             : 
     531           0 :         if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
     532           0 :             av_log(ctx, AV_LOG_ERROR,
     533             :                    "Dequeued v4l2 buffer contains %d bytes, but %d were expected. Flags: 0x%08X.\n",
     534             :                    buf.bytesused, s->frame_size, buf.flags);
     535           0 :             enqueue_buffer(s, &buf);
     536           0 :             return AVERROR_INVALIDDATA;
     537             :         }
     538             :     }
     539             : 
     540             :     /* Image is at s->buff_start[buf.index] */
     541           0 :     if (avpriv_atomic_int_get(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
     542             :         /* when we start getting low on queued buffers, fall back on copying data */
     543           0 :         res = av_new_packet(pkt, buf.bytesused);
     544           0 :         if (res < 0) {
     545           0 :             av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
     546           0 :             enqueue_buffer(s, &buf);
     547           0 :             return res;
     548             :         }
     549           0 :         memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused);
     550             : 
     551           0 :         res = enqueue_buffer(s, &buf);
     552           0 :         if (res) {
     553           0 :             av_packet_unref(pkt);
     554           0 :             return res;
     555             :         }
     556             :     } else {
     557             :         struct buff_data *buf_descriptor;
     558             : 
     559           0 :         pkt->data     = s->buf_start[buf.index];
     560           0 :         pkt->size     = buf.bytesused;
     561             : 
     562           0 :         buf_descriptor = av_malloc(sizeof(struct buff_data));
     563           0 :         if (!buf_descriptor) {
     564             :             /* Something went wrong... Since av_malloc() failed, we cannot even
     565             :              * allocate a buffer for memcpying into it
     566             :              */
     567           0 :             av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
     568           0 :             enqueue_buffer(s, &buf);
     569             : 
     570           0 :             return AVERROR(ENOMEM);
     571             :         }
     572           0 :         buf_descriptor->index = buf.index;
     573           0 :         buf_descriptor->s     = s;
     574             : 
     575           0 :         pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer,
     576             :                                     buf_descriptor, 0);
     577           0 :         if (!pkt->buf) {
     578           0 :             av_log(ctx, AV_LOG_ERROR, "Failed to create a buffer\n");
     579           0 :             enqueue_buffer(s, &buf);
     580           0 :             av_freep(&buf_descriptor);
     581           0 :             return AVERROR(ENOMEM);
     582             :         }
     583             :     }
     584           0 :     pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
     585           0 :     convert_timestamp(ctx, &pkt->pts);
     586             : 
     587           0 :     return pkt->size;
     588             : }
     589             : 
     590           0 : static int mmap_start(AVFormatContext *ctx)
     591             : {
     592           0 :     struct video_data *s = ctx->priv_data;
     593             :     enum v4l2_buf_type type;
     594             :     int i, res;
     595             : 
     596           0 :     for (i = 0; i < s->buffers; i++) {
     597           0 :         struct v4l2_buffer buf = {
     598             :             .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
     599             :             .index  = i,
     600             :             .memory = V4L2_MEMORY_MMAP
     601             :         };
     602             : 
     603           0 :         if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
     604           0 :             res = AVERROR(errno);
     605           0 :             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
     606           0 :                    av_err2str(res));
     607           0 :             return res;
     608             :         }
     609             :     }
     610           0 :     s->buffers_queued = s->buffers;
     611             : 
     612           0 :     type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
     613           0 :     if (v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type) < 0) {
     614           0 :         res = AVERROR(errno);
     615           0 :         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
     616           0 :                av_err2str(res));
     617           0 :         return res;
     618             :     }
     619             : 
     620           0 :     return 0;
     621             : }
     622             : 
     623           0 : static void mmap_close(struct video_data *s)
     624             : {
     625             :     enum v4l2_buf_type type;
     626             :     int i;
     627             : 
     628           0 :     type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
     629             :     /* We do not check for the result, because we could
     630             :      * not do anything about it anyway...
     631             :      */
     632           0 :     v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
     633           0 :     for (i = 0; i < s->buffers; i++) {
     634           0 :         v4l2_munmap(s->buf_start[i], s->buf_len[i]);
     635             :     }
     636           0 :     av_freep(&s->buf_start);
     637           0 :     av_freep(&s->buf_len);
     638           0 : }
     639             : 
     640           0 : static int v4l2_set_parameters(AVFormatContext *ctx)
     641             : {
     642           0 :     struct video_data *s = ctx->priv_data;
     643           0 :     struct v4l2_standard standard = { 0 };
     644           0 :     struct v4l2_streamparm streamparm = { 0 };
     645             :     struct v4l2_fract *tpf;
     646           0 :     AVRational framerate_q = { 0 };
     647             :     int i, ret;
     648             : 
     649           0 :     if (s->framerate &&
     650           0 :         (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
     651           0 :         av_log(ctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
     652             :                s->framerate);
     653           0 :         return ret;
     654             :     }
     655             : 
     656           0 :     if (s->standard) {
     657           0 :         if (s->std_id) {
     658           0 :             ret = 0;
     659           0 :             av_log(ctx, AV_LOG_DEBUG, "Setting standard: %s\n", s->standard);
     660             :             /* set tv standard */
     661           0 :             for (i = 0; ; i++) {
     662           0 :                 standard.index = i;
     663           0 :                 if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
     664           0 :                     ret = AVERROR(errno);
     665           0 :                     break;
     666             :                 }
     667           0 :                 if (!av_strcasecmp(standard.name, s->standard))
     668           0 :                     break;
     669             :             }
     670           0 :             if (ret < 0) {
     671           0 :                 av_log(ctx, AV_LOG_ERROR, "Unknown or unsupported standard '%s'\n", s->standard);
     672           0 :                 return ret;
     673             :             }
     674             : 
     675           0 :             if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
     676           0 :                 ret = AVERROR(errno);
     677           0 :                 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_STD): %s\n", av_err2str(ret));
     678           0 :                 return ret;
     679             :             }
     680             :         } else {
     681           0 :             av_log(ctx, AV_LOG_WARNING,
     682             :                    "This device does not support any standard\n");
     683             :         }
     684             :     }
     685             : 
     686             :     /* get standard */
     687           0 :     if (v4l2_ioctl(s->fd, VIDIOC_G_STD, &s->std_id) == 0) {
     688           0 :         tpf = &standard.frameperiod;
     689           0 :         for (i = 0; ; i++) {
     690           0 :             standard.index = i;
     691           0 :             if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
     692           0 :                 ret = AVERROR(errno);
     693           0 :                 if (ret == AVERROR(EINVAL)
     694             : #ifdef ENODATA
     695           0 :                     || ret == AVERROR(ENODATA)
     696             : #endif
     697             :                 ) {
     698           0 :                     tpf = &streamparm.parm.capture.timeperframe;
     699           0 :                     break;
     700             :                 }
     701           0 :                 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
     702           0 :                 return ret;
     703             :             }
     704           0 :             if (standard.id == s->std_id) {
     705           0 :                 av_log(ctx, AV_LOG_DEBUG,
     706             :                        "Current standard: %s, id: %"PRIx64", frameperiod: %d/%d\n",
     707           0 :                        standard.name, (uint64_t)standard.id, tpf->numerator, tpf->denominator);
     708           0 :                 break;
     709             :             }
     710             :         }
     711             :     } else {
     712           0 :         tpf = &streamparm.parm.capture.timeperframe;
     713             :     }
     714             : 
     715           0 :     streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
     716           0 :     if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) {
     717           0 :         ret = AVERROR(errno);
     718           0 :         av_log(ctx, AV_LOG_WARNING, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret));
     719           0 :     } else if (framerate_q.num && framerate_q.den) {
     720           0 :         if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) {
     721           0 :             tpf = &streamparm.parm.capture.timeperframe;
     722             : 
     723           0 :             av_log(ctx, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
     724             :                    framerate_q.den, framerate_q.num);
     725           0 :             tpf->numerator   = framerate_q.den;
     726           0 :             tpf->denominator = framerate_q.num;
     727             : 
     728           0 :             if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) < 0) {
     729           0 :                 ret = AVERROR(errno);
     730           0 :                 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_PARM): %s\n",
     731           0 :                        av_err2str(ret));
     732           0 :                 return ret;
     733             :             }
     734             : 
     735           0 :             if (framerate_q.num != tpf->denominator ||
     736           0 :                 framerate_q.den != tpf->numerator) {
     737           0 :                 av_log(ctx, AV_LOG_INFO,
     738             :                        "The driver changed the time per frame from "
     739             :                        "%d/%d to %d/%d\n",
     740             :                        framerate_q.den, framerate_q.num,
     741             :                        tpf->numerator, tpf->denominator);
     742             :             }
     743             :         } else {
     744           0 :             av_log(ctx, AV_LOG_WARNING,
     745             :                    "The driver does not permit changing the time per frame\n");
     746             :         }
     747             :     }
     748           0 :     if (tpf->denominator > 0 && tpf->numerator > 0) {
     749           0 :         ctx->streams[0]->avg_frame_rate.num = tpf->denominator;
     750           0 :         ctx->streams[0]->avg_frame_rate.den = tpf->numerator;
     751           0 :         ctx->streams[0]->r_frame_rate = ctx->streams[0]->avg_frame_rate;
     752             :     } else
     753           0 :         av_log(ctx, AV_LOG_WARNING, "Time per frame unknown\n");
     754             : 
     755           0 :     return 0;
     756             : }
     757             : 
     758           0 : static int device_try_init(AVFormatContext *ctx,
     759             :                            enum AVPixelFormat pix_fmt,
     760             :                            int *width,
     761             :                            int *height,
     762             :                            uint32_t *desired_format,
     763             :                            enum AVCodecID *codec_id)
     764             : {
     765             :     int ret, i;
     766             : 
     767           0 :     *desired_format = ff_fmt_ff2v4l(pix_fmt, ctx->video_codec_id);
     768             : 
     769           0 :     if (*desired_format) {
     770           0 :         ret = device_init(ctx, width, height, *desired_format);
     771           0 :         if (ret < 0) {
     772           0 :             *desired_format = 0;
     773           0 :             if (ret != AVERROR(EINVAL))
     774           0 :                 return ret;
     775             :         }
     776             :     }
     777             : 
     778           0 :     if (!*desired_format) {
     779           0 :         for (i = 0; ff_fmt_conversion_table[i].codec_id != AV_CODEC_ID_NONE; i++) {
     780           0 :             if (ctx->video_codec_id == AV_CODEC_ID_NONE ||
     781           0 :                 ff_fmt_conversion_table[i].codec_id == ctx->video_codec_id) {
     782           0 :                 av_log(ctx, AV_LOG_DEBUG, "Trying to set codec:%s pix_fmt:%s\n",
     783             :                        avcodec_get_name(ff_fmt_conversion_table[i].codec_id),
     784           0 :                        (char *)av_x_if_null(av_get_pix_fmt_name(ff_fmt_conversion_table[i].ff_fmt), "none"));
     785             : 
     786           0 :                 *desired_format = ff_fmt_conversion_table[i].v4l2_fmt;
     787           0 :                 ret = device_init(ctx, width, height, *desired_format);
     788           0 :                 if (ret >= 0)
     789           0 :                     break;
     790           0 :                 else if (ret != AVERROR(EINVAL))
     791           0 :                     return ret;
     792           0 :                 *desired_format = 0;
     793             :             }
     794             :         }
     795             : 
     796           0 :         if (*desired_format == 0) {
     797           0 :             av_log(ctx, AV_LOG_ERROR, "Cannot find a proper format for "
     798             :                    "codec '%s' (id %d), pixel format '%s' (id %d)\n",
     799           0 :                    avcodec_get_name(ctx->video_codec_id), ctx->video_codec_id,
     800           0 :                    (char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt), "none"), pix_fmt);
     801           0 :             ret = AVERROR(EINVAL);
     802             :         }
     803             :     }
     804             : 
     805           0 :     *codec_id = ff_fmt_v4l2codec(*desired_format);
     806           0 :     av_assert0(*codec_id != AV_CODEC_ID_NONE);
     807           0 :     return ret;
     808             : }
     809             : 
     810        2871 : static int v4l2_read_probe(AVProbeData *p)
     811             : {
     812        2871 :     if (av_strstart(p->filename, "/dev/video", NULL))
     813           0 :         return AVPROBE_SCORE_MAX - 1;
     814        2871 :     return 0;
     815             : }
     816             : 
     817           0 : static int v4l2_read_header(AVFormatContext *ctx)
     818             : {
     819           0 :     struct video_data *s = ctx->priv_data;
     820             :     AVStream *st;
     821           0 :     int res = 0;
     822             :     uint32_t desired_format;
     823           0 :     enum AVCodecID codec_id = AV_CODEC_ID_NONE;
     824           0 :     enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
     825           0 :     struct v4l2_input input = { 0 };
     826             : 
     827           0 :     st = avformat_new_stream(ctx, NULL);
     828           0 :     if (!st)
     829           0 :         return AVERROR(ENOMEM);
     830             : 
     831             : #if CONFIG_LIBV4L2
     832             :     /* silence libv4l2 logging. if fopen() fails v4l2_log_file will be NULL
     833             :        and errors will get sent to stderr */
     834             :     if (s->use_libv4l2)
     835             :         v4l2_log_file = fopen("/dev/null", "w");
     836             : #endif
     837             : 
     838           0 :     s->fd = device_open(ctx);
     839           0 :     if (s->fd < 0)
     840           0 :         return s->fd;
     841             : 
     842           0 :     if (s->channel != -1) {
     843             :         /* set video input */
     844           0 :         av_log(ctx, AV_LOG_DEBUG, "Selecting input_channel: %d\n", s->channel);
     845           0 :         if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &s->channel) < 0) {
     846           0 :             res = AVERROR(errno);
     847           0 :             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_INPUT): %s\n", av_err2str(res));
     848           0 :             goto fail;
     849             :         }
     850             :     } else {
     851             :         /* get current video input */
     852           0 :         if (v4l2_ioctl(s->fd, VIDIOC_G_INPUT, &s->channel) < 0) {
     853           0 :             res = AVERROR(errno);
     854           0 :             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_INPUT): %s\n", av_err2str(res));
     855           0 :             goto fail;
     856             :         }
     857             :     }
     858             : 
     859             :     /* enum input */
     860           0 :     input.index = s->channel;
     861           0 :     if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
     862           0 :         res = AVERROR(errno);
     863           0 :         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMINPUT): %s\n", av_err2str(res));
     864           0 :         goto fail;
     865             :     }
     866           0 :     s->std_id = input.std;
     867           0 :     av_log(ctx, AV_LOG_DEBUG, "Current input_channel: %d, input_name: %s, input_std: %"PRIx64"\n",
     868           0 :            s->channel, input.name, (uint64_t)input.std);
     869             : 
     870           0 :     if (s->list_format) {
     871           0 :         list_formats(ctx, s->list_format);
     872           0 :         res = AVERROR_EXIT;
     873           0 :         goto fail;
     874             :     }
     875             : 
     876           0 :     if (s->list_standard) {
     877           0 :         list_standards(ctx);
     878           0 :         res = AVERROR_EXIT;
     879           0 :         goto fail;
     880             :     }
     881             : 
     882           0 :     avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
     883             : 
     884           0 :     if (s->pixel_format) {
     885           0 :         AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format);
     886             : 
     887           0 :         if (codec)
     888           0 :             ctx->video_codec_id = codec->id;
     889             : 
     890           0 :         pix_fmt = av_get_pix_fmt(s->pixel_format);
     891             : 
     892           0 :         if (pix_fmt == AV_PIX_FMT_NONE && !codec) {
     893           0 :             av_log(ctx, AV_LOG_ERROR, "No such input format: %s.\n",
     894             :                    s->pixel_format);
     895             : 
     896           0 :             res = AVERROR(EINVAL);
     897           0 :             goto fail;
     898             :         }
     899             :     }
     900             : 
     901           0 :     if (!s->width && !s->height) {
     902           0 :         struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
     903             : 
     904           0 :         av_log(ctx, AV_LOG_VERBOSE,
     905             :                "Querying the device for the current frame size\n");
     906           0 :         if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
     907           0 :             res = AVERROR(errno);
     908           0 :             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
     909           0 :                    av_err2str(res));
     910           0 :             goto fail;
     911             :         }
     912             : 
     913           0 :         s->width  = fmt.fmt.pix.width;
     914           0 :         s->height = fmt.fmt.pix.height;
     915           0 :         av_log(ctx, AV_LOG_VERBOSE,
     916             :                "Setting frame size to %dx%d\n", s->width, s->height);
     917             :     }
     918             : 
     919           0 :     res = device_try_init(ctx, pix_fmt, &s->width, &s->height, &desired_format, &codec_id);
     920           0 :     if (res < 0)
     921           0 :         goto fail;
     922             : 
     923             :     /* If no pixel_format was specified, the codec_id was not known up
     924             :      * until now. Set video_codec_id in the context, as codec_id will
     925             :      * not be available outside this function
     926             :      */
     927           0 :     if (codec_id != AV_CODEC_ID_NONE && ctx->video_codec_id == AV_CODEC_ID_NONE)
     928           0 :         ctx->video_codec_id = codec_id;
     929             : 
     930           0 :     if ((res = av_image_check_size(s->width, s->height, 0, ctx)) < 0)
     931           0 :         goto fail;
     932             : 
     933           0 :     s->pixelformat = desired_format;
     934             : 
     935           0 :     if ((res = v4l2_set_parameters(ctx)) < 0)
     936           0 :         goto fail;
     937             : 
     938           0 :     st->codecpar->format = ff_fmt_v4l2ff(desired_format, codec_id);
     939           0 :     s->frame_size = av_image_get_buffer_size(st->codecpar->format,
     940             :                                              s->width, s->height, 1);
     941             : 
     942           0 :     if ((res = mmap_init(ctx)) ||
     943             :         (res = mmap_start(ctx)) < 0)
     944             :             goto fail;
     945             : 
     946           0 :     s->top_field_first = first_field(s);
     947             : 
     948           0 :     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
     949           0 :     st->codecpar->codec_id = codec_id;
     950           0 :     if (codec_id == AV_CODEC_ID_RAWVIDEO)
     951           0 :         st->codecpar->codec_tag =
     952           0 :             avcodec_pix_fmt_to_codec_tag(st->codecpar->format);
     953           0 :     else if (codec_id == AV_CODEC_ID_H264) {
     954           0 :         st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
     955             :     }
     956           0 :     if (desired_format == V4L2_PIX_FMT_YVU420)
     957           0 :         st->codecpar->codec_tag = MKTAG('Y', 'V', '1', '2');
     958           0 :     else if (desired_format == V4L2_PIX_FMT_YVU410)
     959           0 :         st->codecpar->codec_tag = MKTAG('Y', 'V', 'U', '9');
     960           0 :     st->codecpar->width = s->width;
     961           0 :     st->codecpar->height = s->height;
     962           0 :     if (st->avg_frame_rate.den)
     963           0 :         st->codecpar->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
     964             : 
     965           0 :     return 0;
     966             : 
     967             : fail:
     968           0 :     v4l2_close(s->fd);
     969           0 :     return res;
     970             : }
     971             : 
     972           0 : static int v4l2_read_packet(AVFormatContext *ctx, AVPacket *pkt)
     973             : {
     974             : #if FF_API_CODED_FRAME && FF_API_LAVF_AVCTX
     975             : FF_DISABLE_DEPRECATION_WARNINGS
     976           0 :     struct video_data *s = ctx->priv_data;
     977           0 :     AVFrame *frame = ctx->streams[0]->codec->coded_frame;
     978             : FF_ENABLE_DEPRECATION_WARNINGS
     979             : #endif
     980             :     int res;
     981             : 
     982           0 :     if ((res = mmap_read_frame(ctx, pkt)) < 0) {
     983           0 :         return res;
     984             :     }
     985             : 
     986             : #if FF_API_CODED_FRAME && FF_API_LAVF_AVCTX
     987             : FF_DISABLE_DEPRECATION_WARNINGS
     988           0 :     if (frame && s->interlaced) {
     989           0 :         frame->interlaced_frame = 1;
     990           0 :         frame->top_field_first = s->top_field_first;
     991             :     }
     992             : FF_ENABLE_DEPRECATION_WARNINGS
     993             : #endif
     994             : 
     995           0 :     return pkt->size;
     996             : }
     997             : 
     998           0 : static int v4l2_read_close(AVFormatContext *ctx)
     999             : {
    1000           0 :     struct video_data *s = ctx->priv_data;
    1001             : 
    1002           0 :     if (avpriv_atomic_int_get(&s->buffers_queued) != s->buffers)
    1003           0 :         av_log(ctx, AV_LOG_WARNING, "Some buffers are still owned by the caller on "
    1004             :                "close.\n");
    1005             : 
    1006           0 :     mmap_close(s);
    1007             : 
    1008           0 :     v4l2_close(s->fd);
    1009           0 :     return 0;
    1010             : }
    1011             : 
    1012           0 : static int v4l2_is_v4l_dev(const char *name)
    1013             : {
    1014           0 :     return !strncmp(name, "video", 5) ||
    1015           0 :            !strncmp(name, "radio", 5) ||
    1016           0 :            !strncmp(name, "vbi", 3) ||
    1017           0 :            !strncmp(name, "v4l-subdev", 10);
    1018             : }
    1019             : 
    1020           0 : static int v4l2_get_device_list(AVFormatContext *ctx, AVDeviceInfoList *device_list)
    1021             : {
    1022           0 :     struct video_data *s = ctx->priv_data;
    1023             :     DIR *dir;
    1024             :     struct dirent *entry;
    1025           0 :     AVDeviceInfo *device = NULL;
    1026             :     struct v4l2_capability cap;
    1027           0 :     int ret = 0;
    1028             : 
    1029           0 :     if (!device_list)
    1030           0 :         return AVERROR(EINVAL);
    1031             : 
    1032           0 :     dir = opendir("/dev");
    1033           0 :     if (!dir) {
    1034           0 :         ret = AVERROR(errno);
    1035           0 :         av_log(ctx, AV_LOG_ERROR, "Couldn't open the directory: %s\n", av_err2str(ret));
    1036           0 :         return ret;
    1037             :     }
    1038           0 :     while ((entry = readdir(dir))) {
    1039           0 :         if (!v4l2_is_v4l_dev(entry->d_name))
    1040           0 :             continue;
    1041             : 
    1042           0 :         snprintf(ctx->filename, sizeof(ctx->filename), "/dev/%s", entry->d_name);
    1043           0 :         if ((s->fd = device_open(ctx)) < 0)
    1044           0 :             continue;
    1045             : 
    1046           0 :         if (v4l2_ioctl(s->fd, VIDIOC_QUERYCAP, &cap) < 0) {
    1047           0 :             ret = AVERROR(errno);
    1048           0 :             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", av_err2str(ret));
    1049           0 :             goto fail;
    1050             :         }
    1051             : 
    1052           0 :         device = av_mallocz(sizeof(AVDeviceInfo));
    1053           0 :         if (!device) {
    1054           0 :             ret = AVERROR(ENOMEM);
    1055           0 :             goto fail;
    1056             :         }
    1057           0 :         device->device_name = av_strdup(ctx->filename);
    1058           0 :         device->device_description = av_strdup(cap.card);
    1059           0 :         if (!device->device_name || !device->device_description) {
    1060           0 :             ret = AVERROR(ENOMEM);
    1061           0 :             goto fail;
    1062             :         }
    1063             : 
    1064           0 :         if ((ret = av_dynarray_add_nofree(&device_list->devices,
    1065             :                                           &device_list->nb_devices, device)) < 0)
    1066           0 :             goto fail;
    1067             : 
    1068           0 :         v4l2_close(s->fd);
    1069           0 :         s->fd = -1;
    1070           0 :         continue;
    1071             : 
    1072             :       fail:
    1073           0 :         if (device) {
    1074           0 :             av_freep(&device->device_name);
    1075           0 :             av_freep(&device->device_description);
    1076           0 :             av_freep(&device);
    1077             :         }
    1078           0 :         if (s->fd >= 0)
    1079           0 :             v4l2_close(s->fd);
    1080           0 :         s->fd = -1;
    1081           0 :         break;
    1082             :     }
    1083           0 :     closedir(dir);
    1084           0 :     return ret;
    1085             : }
    1086             : 
    1087             : #define OFFSET(x) offsetof(struct video_data, x)
    1088             : #define DEC AV_OPT_FLAG_DECODING_PARAM
    1089             : 
    1090             : static const AVOption options[] = {
    1091             :     { "standard",     "set TV standard, used only by analog frame grabber",       OFFSET(standard),     AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0,       DEC },
    1092             :     { "channel",      "set TV channel, used only by frame grabber",               OFFSET(channel),      AV_OPT_TYPE_INT,    {.i64 = -1 },  -1, INT_MAX, DEC },
    1093             :     { "video_size",   "set frame size",                                           OFFSET(width),        AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL},  0, 0,   DEC },
    1094             :     { "pixel_format", "set preferred pixel format",                               OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
    1095             :     { "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
    1096             :     { "framerate",    "set frame rate",                                           OFFSET(framerate),    AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
    1097             : 
    1098             :     { "list_formats", "list available formats and exit",                          OFFSET(list_format),  AV_OPT_TYPE_INT,    {.i64 = 0 },  0, INT_MAX, DEC, "list_formats" },
    1099             :     { "all",          "show all available formats",                               OFFSET(list_format),  AV_OPT_TYPE_CONST,  {.i64 = V4L_ALLFORMATS  },    0, INT_MAX, DEC, "list_formats" },
    1100             :     { "raw",          "show only non-compressed formats",                         OFFSET(list_format),  AV_OPT_TYPE_CONST,  {.i64 = V4L_RAWFORMATS  },    0, INT_MAX, DEC, "list_formats" },
    1101             :     { "compressed",   "show only compressed formats",                             OFFSET(list_format),  AV_OPT_TYPE_CONST,  {.i64 = V4L_COMPFORMATS },    0, INT_MAX, DEC, "list_formats" },
    1102             : 
    1103             :     { "list_standards", "list supported standards and exit",                      OFFSET(list_standard), AV_OPT_TYPE_INT,   {.i64 = 0 },  0, 1, DEC, "list_standards" },
    1104             :     { "all",            "show all supported standards",                           OFFSET(list_standard), AV_OPT_TYPE_CONST, {.i64 = 1 },  0, 0, DEC, "list_standards" },
    1105             : 
    1106             :     { "timestamps",   "set type of timestamps for grabbed frames",                OFFSET(ts_mode),      AV_OPT_TYPE_INT,    {.i64 = 0 }, 0, 2, DEC, "timestamps" },
    1107             :     { "ts",           "set type of timestamps for grabbed frames",                OFFSET(ts_mode),      AV_OPT_TYPE_INT,    {.i64 = 0 }, 0, 2, DEC, "timestamps" },
    1108             :     { "default",      "use timestamps from the kernel",                           OFFSET(ts_mode),      AV_OPT_TYPE_CONST,  {.i64 = V4L_TS_DEFAULT  }, 0, 2, DEC, "timestamps" },
    1109             :     { "abs",          "use absolute timestamps (wall clock)",                     OFFSET(ts_mode),      AV_OPT_TYPE_CONST,  {.i64 = V4L_TS_ABS      }, 0, 2, DEC, "timestamps" },
    1110             :     { "mono2abs",     "force conversion from monotonic to absolute timestamps",   OFFSET(ts_mode),      AV_OPT_TYPE_CONST,  {.i64 = V4L_TS_MONO2ABS }, 0, 2, DEC, "timestamps" },
    1111             :     { "use_libv4l2",  "use libv4l2 (v4l-utils) conversion functions",             OFFSET(use_libv4l2),  AV_OPT_TYPE_BOOL,   {.i64 = 0}, 0, 1, DEC },
    1112             :     { NULL },
    1113             : };
    1114             : 
    1115             : static const AVClass v4l2_class = {
    1116             :     .class_name = "V4L2 indev",
    1117             :     .item_name  = av_default_item_name,
    1118             :     .option     = options,
    1119             :     .version    = LIBAVUTIL_VERSION_INT,
    1120             :     .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
    1121             : };
    1122             : 
    1123             : AVInputFormat ff_v4l2_demuxer = {
    1124             :     .name           = "video4linux2,v4l2",
    1125             :     .long_name      = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
    1126             :     .priv_data_size = sizeof(struct video_data),
    1127             :     .read_probe     = v4l2_read_probe,
    1128             :     .read_header    = v4l2_read_header,
    1129             :     .read_packet    = v4l2_read_packet,
    1130             :     .read_close     = v4l2_read_close,
    1131             :     .get_device_list = v4l2_get_device_list,
    1132             :     .flags          = AVFMT_NOFILE,
    1133             :     .priv_class     = &v4l2_class,
    1134             : };

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