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  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.  
  35. #if CONFIG_LIBV4L2
  36. #include <libv4l2.h>
  37. #endif
  38.  
  39. static const int desired_video_buffers = 256;
  40.  
  41. #define V4L_ALLFORMATS  3
  42. #define V4L_RAWFORMATS  1
  43. #define V4L_COMPFORMATS 2
  44.  
  45. /**
  46.  * Return timestamps to the user exactly as returned by the kernel
  47.  */
  48. #define V4L_TS_DEFAULT  0
  49. /**
  50.  * Autodetect the kind of timestamps returned by the kernel and convert to
  51.  * absolute (wall clock) timestamps.
  52.  */
  53. #define V4L_TS_ABS      1
  54. /**
  55.  * Assume kernel timestamps are from the monotonic clock and convert to
  56.  * absolute timestamps.
  57.  */
  58. #define V4L_TS_MONO2ABS 2
  59.  
  60. /**
  61.  * Once the kind of timestamps returned by the kernel have been detected,
  62.  * the value of the timefilter (NULL or not) determines whether a conversion
  63.  * takes place.
  64.  */
  65. #define V4L_TS_CONVERT_READY V4L_TS_DEFAULT
  66.  
  67. struct video_data {
  68.     AVClass *class;
  69.     int fd;
  70.     int frame_format; /* V4L2_PIX_FMT_* */
  71.     int width, height;
  72.     int frame_size;
  73.     int interlaced;
  74.     int top_field_first;
  75.     int ts_mode;
  76.     TimeFilter *timefilter;
  77.     int64_t last_time_m;
  78.  
  79.     int buffers;
  80.     volatile int buffers_queued;
  81.     void **buf_start;
  82.     unsigned int *buf_len;
  83.     char *standard;
  84.     v4l2_std_id std_id;
  85.     int channel;
  86.     char *pixel_format; /**< Set by a private option. */
  87.     int list_format;    /**< Set by a private option. */
  88.     int list_standard;  /**< Set by a private option. */
  89.     char *framerate;    /**< Set by a private option. */
  90.  
  91.     int use_libv4l2;
  92.     int (*open_f)(const char *file, int oflag, ...);
  93.     int (*close_f)(int fd);
  94.     int (*dup_f)(int fd);
  95.     int (*ioctl_f)(int fd, unsigned long int request, ...);
  96.     ssize_t (*read_f)(int fd, void *buffer, size_t n);
  97.     void *(*mmap_f)(void *start, size_t length, int prot, int flags, int fd, int64_t offset);
  98.     int (*munmap_f)(void *_start, size_t length);
  99. };
  100.  
  101. struct buff_data {
  102.     struct video_data *s;
  103.     int index;
  104. };
  105.  
  106. static int device_open(AVFormatContext *ctx)
  107. {
  108.     struct video_data *s = ctx->priv_data;
  109.     struct v4l2_capability cap;
  110.     int fd;
  111.     int ret;
  112.     int flags = O_RDWR;
  113.  
  114. #define SET_WRAPPERS(prefix) do {       \
  115.     s->open_f   = prefix ## open;       \
  116.     s->close_f  = prefix ## close;      \
  117.     s->dup_f    = prefix ## dup;        \
  118.     s->ioctl_f  = prefix ## ioctl;      \
  119.     s->read_f   = prefix ## read;       \
  120.     s->mmap_f   = prefix ## mmap;       \
  121.     s->munmap_f = prefix ## munmap;     \
  122. } while (0)
  123.  
  124.     if (s->use_libv4l2) {
  125. #if CONFIG_LIBV4L2
  126.         SET_WRAPPERS(v4l2_);
  127. #else
  128.         av_log(ctx, AV_LOG_ERROR, "libavdevice is not build with libv4l2 support.\n");
  129.         return AVERROR(EINVAL);
  130. #endif
  131.     } else {
  132.         SET_WRAPPERS();
  133.     }
  134.  
  135. #define v4l2_open   s->open_f
  136. #define v4l2_close  s->close_f
  137. #define v4l2_dup    s->dup_f
  138. #define v4l2_ioctl  s->ioctl_f
  139. #define v4l2_read   s->read_f
  140. #define v4l2_mmap   s->mmap_f
  141. #define v4l2_munmap s->munmap_f
  142.  
  143.     if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
  144.         flags |= O_NONBLOCK;
  145.     }
  146.  
  147.     fd = v4l2_open(ctx->filename, flags, 0);
  148.     if (fd < 0) {
  149.         ret = AVERROR(errno);
  150.         av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s: %s\n",
  151.                ctx->filename, av_err2str(ret));
  152.         return ret;
  153.     }
  154.  
  155.     if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
  156.         ret = AVERROR(errno);
  157.         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
  158.                av_err2str(ret));
  159.         goto fail;
  160.     }
  161.  
  162.     av_log(ctx, AV_LOG_VERBOSE, "fd:%d capabilities:%x\n",
  163.            fd, cap.capabilities);
  164.  
  165.     if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
  166.         av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
  167.         ret = AVERROR(ENODEV);
  168.         goto fail;
  169.     }
  170.  
  171.     if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
  172.         av_log(ctx, AV_LOG_ERROR,
  173.                "The device does not support the streaming I/O method.\n");
  174.         ret = AVERROR(ENOSYS);
  175.         goto fail;
  176.     }
  177.  
  178.     return fd;
  179.  
  180. fail:
  181.     v4l2_close(fd);
  182.     return ret;
  183. }
  184.  
  185. static int device_init(AVFormatContext *ctx, int *width, int *height,
  186.                        uint32_t pix_fmt)
  187. {
  188.     struct video_data *s = ctx->priv_data;
  189.     int fd = s->fd;
  190.     struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
  191.     struct v4l2_pix_format *pix = &fmt.fmt.pix;
  192.  
  193.     int res = 0;
  194.  
  195.     pix->width = *width;
  196.     pix->height = *height;
  197.     pix->pixelformat = pix_fmt;
  198.     pix->field = V4L2_FIELD_ANY;
  199.  
  200.     if (v4l2_ioctl(fd, VIDIOC_S_FMT, &fmt) < 0)
  201.         res = AVERROR(errno);
  202.  
  203.     if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
  204.         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.         *width = fmt.fmt.pix.width;
  208.         *height = fmt.fmt.pix.height;
  209.     }
  210.  
  211.     if (pix_fmt != fmt.fmt.pix.pixelformat) {
  212.         av_log(ctx, AV_LOG_DEBUG,
  213.                "The V4L2 driver changed the pixel format "
  214.                "from 0x%08X to 0x%08X\n",
  215.                pix_fmt, fmt.fmt.pix.pixelformat);
  216.         res = AVERROR(EINVAL);
  217.     }
  218.  
  219.     if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
  220.         av_log(ctx, AV_LOG_DEBUG,
  221.                "The V4L2 driver is using the interlaced mode\n");
  222.         s->interlaced = 1;
  223.     }
  224.  
  225.     return res;
  226. }
  227.  
  228. static int first_field(const struct video_data *s, int fd)
  229. {
  230.     int res;
  231.     v4l2_std_id std;
  232.  
  233.     res = v4l2_ioctl(fd, VIDIOC_G_STD, &std);
  234.     if (res < 0) {
  235.         return 0;
  236.     }
  237.     if (std & V4L2_STD_NTSC) {
  238.         return 0;
  239.     }
  240.  
  241.     return 1;
  242. }
  243.  
  244. #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
  245. static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat)
  246. {
  247.     const struct video_data *s = ctx->priv_data;
  248.     struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
  249.  
  250.     while(!v4l2_ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
  251.         switch (vfse.type) {
  252.         case V4L2_FRMSIZE_TYPE_DISCRETE:
  253.             av_log(ctx, AV_LOG_INFO, " %ux%u",
  254.                    vfse.discrete.width, vfse.discrete.height);
  255.         break;
  256.         case V4L2_FRMSIZE_TYPE_CONTINUOUS:
  257.         case V4L2_FRMSIZE_TYPE_STEPWISE:
  258.             av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
  259.                    vfse.stepwise.min_width,
  260.                    vfse.stepwise.max_width,
  261.                    vfse.stepwise.step_width,
  262.                    vfse.stepwise.min_height,
  263.                    vfse.stepwise.max_height,
  264.                    vfse.stepwise.step_height);
  265.         }
  266.         vfse.index++;
  267.     }
  268. }
  269. #endif
  270.  
  271. static void list_formats(AVFormatContext *ctx, int fd, int type)
  272. {
  273.     const struct video_data *s = ctx->priv_data;
  274.     struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
  275.  
  276.     while(!v4l2_ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) {
  277.         enum AVCodecID codec_id = avpriv_fmt_v4l2codec(vfd.pixelformat);
  278.         enum AVPixelFormat pix_fmt = avpriv_fmt_v4l2ff(vfd.pixelformat, codec_id);
  279.  
  280.         vfd.index++;
  281.  
  282.         if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
  283.             type & V4L_RAWFORMATS) {
  284.             const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
  285.             av_log(ctx, AV_LOG_INFO, "Raw       : %9s : %20s :",
  286.                    fmt_name ? fmt_name : "Unsupported",
  287.                    vfd.description);
  288.         } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
  289.                    type & V4L_COMPFORMATS) {
  290.             AVCodec *codec = avcodec_find_decoder(codec_id);
  291.             av_log(ctx, AV_LOG_INFO, "Compressed: %9s : %20s :",
  292.                    codec ? codec->name : "Unsupported",
  293.                    vfd.description);
  294.         } else {
  295.             continue;
  296.         }
  297.  
  298. #ifdef V4L2_FMT_FLAG_EMULATED
  299.         if (vfd.flags & V4L2_FMT_FLAG_EMULATED)
  300.             av_log(ctx, AV_LOG_INFO, " Emulated :");
  301. #endif
  302. #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
  303.         list_framesizes(ctx, fd, vfd.pixelformat);
  304. #endif
  305.         av_log(ctx, AV_LOG_INFO, "\n");
  306.     }
  307. }
  308.  
  309. static void list_standards(AVFormatContext *ctx)
  310. {
  311.     int ret;
  312.     struct video_data *s = ctx->priv_data;
  313.     struct v4l2_standard standard;
  314.  
  315.     if (s->std_id == 0)
  316.         return;
  317.  
  318.     for (standard.index = 0; ; standard.index++) {
  319.         if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
  320.             ret = AVERROR(errno);
  321.             if (ret == AVERROR(EINVAL)) {
  322.                 break;
  323.             } else {
  324.                 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
  325.                 return;
  326.             }
  327.         }
  328.         av_log(ctx, AV_LOG_INFO, "%2d, %16"PRIx64", %s\n",
  329.                standard.index, (uint64_t)standard.id, standard.name);
  330.     }
  331. }
  332.  
  333. static int mmap_init(AVFormatContext *ctx)
  334. {
  335.     int i, res;
  336.     struct video_data *s = ctx->priv_data;
  337.     struct v4l2_requestbuffers req = {
  338.         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
  339.         .count  = desired_video_buffers,
  340.         .memory = V4L2_MEMORY_MMAP
  341.     };
  342.  
  343.     if (v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req) < 0) {
  344.         res = AVERROR(errno);
  345.         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS): %s\n", av_err2str(res));
  346.         return res;
  347.     }
  348.  
  349.     if (req.count < 2) {
  350.         av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
  351.         return AVERROR(ENOMEM);
  352.     }
  353.     s->buffers = req.count;
  354.     s->buf_start = av_malloc(sizeof(void *) * s->buffers);
  355.     if (s->buf_start == NULL) {
  356.         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
  357.         return AVERROR(ENOMEM);
  358.     }
  359.     s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
  360.     if (s->buf_len == NULL) {
  361.         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
  362.         av_free(s->buf_start);
  363.         return AVERROR(ENOMEM);
  364.     }
  365.  
  366.     for (i = 0; i < req.count; i++) {
  367.         struct v4l2_buffer buf = {
  368.             .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
  369.             .index  = i,
  370.             .memory = V4L2_MEMORY_MMAP
  371.         };
  372.         if (v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf) < 0) {
  373.             res = AVERROR(errno);
  374.             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF): %s\n", av_err2str(res));
  375.             return res;
  376.         }
  377.  
  378.         s->buf_len[i] = buf.length;
  379.         if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
  380.             av_log(ctx, AV_LOG_ERROR,
  381.                    "buf_len[%d] = %d < expected frame size %d\n",
  382.                    i, s->buf_len[i], s->frame_size);
  383.             return AVERROR(ENOMEM);
  384.         }
  385.         s->buf_start[i] = v4l2_mmap(NULL, buf.length,
  386.                                PROT_READ | PROT_WRITE, MAP_SHARED,
  387.                                s->fd, buf.m.offset);
  388.  
  389.         if (s->buf_start[i] == MAP_FAILED) {
  390.             res = AVERROR(errno);
  391.             av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", av_err2str(res));
  392.             return res;
  393.         }
  394.     }
  395.  
  396.     return 0;
  397. }
  398.  
  399. #if FF_API_DESTRUCT_PACKET
  400. static void dummy_release_buffer(AVPacket *pkt)
  401. {
  402.     av_assert0(0);
  403. }
  404. #endif
  405.  
  406. static void mmap_release_buffer(void *opaque, uint8_t *data)
  407. {
  408.     struct v4l2_buffer buf = { 0 };
  409.     int res;
  410.     struct buff_data *buf_descriptor = opaque;
  411.     struct video_data *s = buf_descriptor->s;
  412.  
  413.     buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  414.     buf.memory = V4L2_MEMORY_MMAP;
  415.     buf.index = buf_descriptor->index;
  416.     av_free(buf_descriptor);
  417.  
  418.     if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
  419.         res = AVERROR(errno);
  420.         av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
  421.                av_err2str(res));
  422.     }
  423.  
  424.     avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
  425. }
  426.  
  427. #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
  428. static int64_t av_gettime_monotonic(void)
  429. {
  430.     struct timespec tv;
  431.  
  432.     clock_gettime(CLOCK_MONOTONIC, &tv);
  433.     return (int64_t)tv.tv_sec * 1000000 + tv.tv_nsec / 1000;
  434. }
  435. #endif
  436.  
  437. static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts)
  438. {
  439.     struct video_data *s = ctx->priv_data;
  440.     int64_t now;
  441.  
  442.     now = av_gettime();
  443.     if (s->ts_mode == V4L_TS_ABS &&
  444.         ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) {
  445.         av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n");
  446.         s->ts_mode = V4L_TS_CONVERT_READY;
  447.         return 0;
  448.     }
  449. #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
  450.     now = av_gettime_monotonic();
  451.     if (s->ts_mode == V4L_TS_MONO2ABS ||
  452.         (ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) {
  453.         AVRational tb = {AV_TIME_BASE, 1};
  454.         int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate);
  455.         av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n");
  456.         /* microseconds instead of seconds, MHz instead of Hz */
  457.         s->timefilter = ff_timefilter_new(1, period, 1.0E-6);
  458.         if (!s->timefilter)
  459.             return AVERROR(ENOMEM);
  460.         s->ts_mode = V4L_TS_CONVERT_READY;
  461.         return 0;
  462.     }
  463. #endif
  464.     av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n");
  465.     return AVERROR(EIO);
  466. }
  467.  
  468. static int convert_timestamp(AVFormatContext *ctx, int64_t *ts)
  469. {
  470.     struct video_data *s = ctx->priv_data;
  471.  
  472.     if (s->ts_mode) {
  473.         int r = init_convert_timestamp(ctx, *ts);
  474.         if (r < 0)
  475.             return r;
  476.     }
  477. #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
  478.     if (s->timefilter) {
  479.         int64_t nowa = av_gettime();
  480.         int64_t nowm = av_gettime_monotonic();
  481.         ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m);
  482.         s->last_time_m = nowm;
  483.         *ts = ff_timefilter_eval(s->timefilter, *ts - nowm);
  484.     }
  485. #endif
  486.     return 0;
  487. }
  488.  
  489. static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
  490. {
  491.     struct video_data *s = ctx->priv_data;
  492.     struct v4l2_buffer buf = {
  493.         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
  494.         .memory = V4L2_MEMORY_MMAP
  495.     };
  496.     int res;
  497.  
  498.     /* FIXME: Some special treatment might be needed in case of loss of signal... */
  499.     while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
  500.     if (res < 0) {
  501.         if (errno == EAGAIN) {
  502.             pkt->size = 0;
  503.             return AVERROR(EAGAIN);
  504.         }
  505.         res = AVERROR(errno);
  506.         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", av_err2str(res));
  507.         return res;
  508.     }
  509.  
  510.     if (buf.index >= s->buffers) {
  511.         av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
  512.         return AVERROR(EINVAL);
  513.     }
  514.     avpriv_atomic_int_add_and_fetch(&s->buffers_queued, -1);
  515.     // always keep at least one buffer queued
  516.     av_assert0(avpriv_atomic_int_get(&s->buffers_queued) >= 1);
  517.  
  518.     /* CPIA is a compressed format and we don't know the exact number of bytes
  519.      * used by a frame, so set it here as the driver announces it.
  520.      */
  521.     if (ctx->video_codec_id == AV_CODEC_ID_CPIA)
  522.         s->frame_size = buf.bytesused;
  523.  
  524.     if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
  525.         av_log(ctx, AV_LOG_ERROR,
  526.                "The v4l2 frame is %d bytes, but %d bytes are expected\n",
  527.                buf.bytesused, s->frame_size);
  528.         return AVERROR_INVALIDDATA;
  529.     }
  530.  
  531.     /* Image is at s->buff_start[buf.index] */
  532.     if (avpriv_atomic_int_get(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
  533.         /* when we start getting low on queued buffers, fall back on copying data */
  534.         res = av_new_packet(pkt, buf.bytesused);
  535.         if (res < 0) {
  536.             av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
  537.             if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0)
  538.                 avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
  539.             return res;
  540.         }
  541.         memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused);
  542.  
  543.         if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
  544.             res = AVERROR(errno);
  545.             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res));
  546.             av_free_packet(pkt);
  547.             return res;
  548.         }
  549.         avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
  550.     } else {
  551.         struct buff_data *buf_descriptor;
  552.  
  553.         pkt->data     = s->buf_start[buf.index];
  554.         pkt->size     = buf.bytesused;
  555. #if FF_API_DESTRUCT_PACKET
  556. FF_DISABLE_DEPRECATION_WARNINGS
  557.         pkt->destruct = dummy_release_buffer;
  558. FF_ENABLE_DEPRECATION_WARNINGS
  559. #endif
  560.  
  561.         buf_descriptor = av_malloc(sizeof(struct buff_data));
  562.         if (buf_descriptor == NULL) {
  563.             /* Something went wrong... Since av_malloc() failed, we cannot even
  564.              * allocate a buffer for memcpying into it
  565.              */
  566.             av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
  567.             if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0)
  568.                 avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
  569.  
  570.             return AVERROR(ENOMEM);
  571.         }
  572.         buf_descriptor->index = buf.index;
  573.         buf_descriptor->s     = s;
  574.  
  575.         pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer,
  576.                                     buf_descriptor, 0);
  577.         if (!pkt->buf) {
  578.             av_log(ctx, AV_LOG_ERROR, "Failed to create a buffer\n");
  579.             if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0)
  580.                 avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
  581.             av_freep(&buf_descriptor);
  582.             return AVERROR(ENOMEM);
  583.         }
  584.     }
  585.     pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
  586.     convert_timestamp(ctx, &pkt->pts);
  587.  
  588.     return s->buf_len[buf.index];
  589. }
  590.  
  591. static int mmap_start(AVFormatContext *ctx)
  592. {
  593.     struct video_data *s = ctx->priv_data;
  594.     enum v4l2_buf_type type;
  595.     int i, res;
  596.  
  597.     for (i = 0; i < s->buffers; i++) {
  598.         struct v4l2_buffer buf = {
  599.             .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
  600.             .index  = i,
  601.             .memory = V4L2_MEMORY_MMAP
  602.         };
  603.  
  604.         if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
  605.             res = AVERROR(errno);
  606.             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res));
  607.             return res;
  608.         }
  609.     }
  610.     s->buffers_queued = s->buffers;
  611.  
  612.     type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  613.     if (v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type) < 0) {
  614.         res = AVERROR(errno);
  615.         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", av_err2str(res));
  616.         return res;
  617.     }
  618.  
  619.     return 0;
  620. }
  621.  
  622. static void mmap_close(struct video_data *s)
  623. {
  624.     enum v4l2_buf_type type;
  625.     int i;
  626.  
  627.     type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  628.     /* We do not check for the result, because we could
  629.      * not do anything about it anyway...
  630.      */
  631.     v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
  632.     for (i = 0; i < s->buffers; i++) {
  633.         v4l2_munmap(s->buf_start[i], s->buf_len[i]);
  634.     }
  635.     av_free(s->buf_start);
  636.     av_free(s->buf_len);
  637. }
  638.  
  639. static int v4l2_set_parameters(AVFormatContext *s1)
  640. {
  641.     struct video_data *s = s1->priv_data;
  642.     struct v4l2_standard standard = { 0 };
  643.     struct v4l2_streamparm streamparm = { 0 };
  644.     struct v4l2_fract *tpf;
  645.     AVRational framerate_q = { 0 };
  646.     int i, ret;
  647.  
  648.     if (s->framerate &&
  649.         (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
  650.         av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
  651.                s->framerate);
  652.         return ret;
  653.     }
  654.  
  655.     if (s->standard) {
  656.         if (s->std_id) {
  657.             ret = 0;
  658.             av_log(s1, AV_LOG_DEBUG, "Setting standard: %s\n", s->standard);
  659.             /* set tv standard */
  660.             for (i = 0; ; i++) {
  661.                 standard.index = i;
  662.                 if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
  663.                     ret = AVERROR(errno);
  664.                     break;
  665.                 }
  666.                 if (!av_strcasecmp(standard.name, s->standard))
  667.                     break;
  668.             }
  669.             if (ret < 0) {
  670.                 av_log(s1, AV_LOG_ERROR, "Unknown or unsupported standard '%s'\n", s->standard);
  671.                 return ret;
  672.             }
  673.  
  674.             if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
  675.                 ret = AVERROR(errno);
  676.                 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_STD): %s\n", av_err2str(ret));
  677.                 return ret;
  678.             }
  679.         } else {
  680.             av_log(s1, AV_LOG_WARNING,
  681.                    "This device does not support any standard\n");
  682.         }
  683.     }
  684.  
  685.     /* get standard */
  686.     if (v4l2_ioctl(s->fd, VIDIOC_G_STD, &s->std_id) == 0) {
  687.         tpf = &standard.frameperiod;
  688.         for (i = 0; ; i++) {
  689.             standard.index = i;
  690.             if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
  691.                 ret = AVERROR(errno);
  692.                 if (ret == AVERROR(EINVAL)) {
  693.                     tpf = &streamparm.parm.capture.timeperframe;
  694.                     break;
  695.                 }
  696.                 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
  697.                 return ret;
  698.             }
  699.             if (standard.id == s->std_id) {
  700.                 av_log(s1, AV_LOG_DEBUG,
  701.                        "Current standard: %s, id: %"PRIx64", frameperiod: %d/%d\n",
  702.                        standard.name, (uint64_t)standard.id, tpf->numerator, tpf->denominator);
  703.                 break;
  704.             }
  705.         }
  706.     } else {
  707.         tpf = &streamparm.parm.capture.timeperframe;
  708.     }
  709.  
  710.     streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  711.     if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) {
  712.         ret = AVERROR(errno);
  713.         av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret));
  714.         return ret;
  715.     }
  716.  
  717.     if (framerate_q.num && framerate_q.den) {
  718.         if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) {
  719.             tpf = &streamparm.parm.capture.timeperframe;
  720.  
  721.             av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
  722.                    framerate_q.den, framerate_q.num);
  723.             tpf->numerator   = framerate_q.den;
  724.             tpf->denominator = framerate_q.num;
  725.  
  726.             if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) < 0) {
  727.                 ret = AVERROR(errno);
  728.                 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_PARM): %s\n", av_err2str(ret));
  729.                 return ret;
  730.             }
  731.  
  732.             if (framerate_q.num != tpf->denominator ||
  733.                 framerate_q.den != tpf->numerator) {
  734.                 av_log(s1, AV_LOG_INFO,
  735.                        "The driver changed the time per frame from "
  736.                        "%d/%d to %d/%d\n",
  737.                        framerate_q.den, framerate_q.num,
  738.                        tpf->numerator, tpf->denominator);
  739.             }
  740.         } else {
  741.             av_log(s1, AV_LOG_WARNING,
  742.                    "The driver does not allow to change time per frame\n");
  743.         }
  744.     }
  745.     s1->streams[0]->avg_frame_rate.num = tpf->denominator;
  746.     s1->streams[0]->avg_frame_rate.den = tpf->numerator;
  747.     s1->streams[0]->r_frame_rate = s1->streams[0]->avg_frame_rate;
  748.  
  749.     return 0;
  750. }
  751.  
  752. static int device_try_init(AVFormatContext *s1,
  753.                            enum AVPixelFormat pix_fmt,
  754.                            int *width,
  755.                            int *height,
  756.                            uint32_t *desired_format,
  757.                            enum AVCodecID *codec_id)
  758. {
  759.     int ret, i;
  760.  
  761.     *desired_format = avpriv_fmt_ff2v4l(pix_fmt, s1->video_codec_id);
  762.  
  763.     if (*desired_format) {
  764.         ret = device_init(s1, width, height, *desired_format);
  765.         if (ret < 0) {
  766.             *desired_format = 0;
  767.             if (ret != AVERROR(EINVAL))
  768.                 return ret;
  769.         }
  770.     }
  771.  
  772.     if (!*desired_format) {
  773.         for (i = 0; avpriv_fmt_conversion_table[i].codec_id != AV_CODEC_ID_NONE; i++) {
  774.             if (s1->video_codec_id == AV_CODEC_ID_NONE ||
  775.                 avpriv_fmt_conversion_table[i].codec_id == s1->video_codec_id) {
  776.                 av_log(s1, AV_LOG_DEBUG, "Trying to set codec:%s pix_fmt:%s\n",
  777.                        avcodec_get_name(avpriv_fmt_conversion_table[i].codec_id),
  778.                        (char *)av_x_if_null(av_get_pix_fmt_name(avpriv_fmt_conversion_table[i].ff_fmt), "none"));
  779.  
  780.                 *desired_format = avpriv_fmt_conversion_table[i].v4l2_fmt;
  781.                 ret = device_init(s1, width, height, *desired_format);
  782.                 if (ret >= 0)
  783.                     break;
  784.                 else if (ret != AVERROR(EINVAL))
  785.                     return ret;
  786.                 *desired_format = 0;
  787.             }
  788.         }
  789.  
  790.         if (*desired_format == 0) {
  791.             av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
  792.                    "codec '%s' (id %d), pixel format '%s' (id %d)\n",
  793.                    avcodec_get_name(s1->video_codec_id), s1->video_codec_id,
  794.                    (char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt), "none"), pix_fmt);
  795.             ret = AVERROR(EINVAL);
  796.         }
  797.     }
  798.  
  799.     *codec_id = avpriv_fmt_v4l2codec(*desired_format);
  800.     av_assert0(*codec_id != AV_CODEC_ID_NONE);
  801.     return ret;
  802. }
  803.  
  804. static int v4l2_read_header(AVFormatContext *s1)
  805. {
  806.     struct video_data *s = s1->priv_data;
  807.     AVStream *st;
  808.     int res = 0;
  809.     uint32_t desired_format;
  810.     enum AVCodecID codec_id = AV_CODEC_ID_NONE;
  811.     enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
  812.     struct v4l2_input input = { 0 };
  813.  
  814.     st = avformat_new_stream(s1, NULL);
  815.     if (!st)
  816.         return AVERROR(ENOMEM);
  817.  
  818. #if CONFIG_LIBV4L2
  819.     /* silence libv4l2 logging. if fopen() fails v4l2_log_file will be NULL
  820.        and errors will get sent to stderr */
  821.     if (s->use_libv4l2)
  822.         v4l2_log_file = fopen("/dev/null", "w");
  823. #endif
  824.  
  825.     s->fd = device_open(s1);
  826.     if (s->fd < 0)
  827.         return s->fd;
  828.  
  829.     if (s->channel != -1) {
  830.         /* set video input */
  831.         av_log(s1, AV_LOG_DEBUG, "Selecting input_channel: %d\n", s->channel);
  832.         if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &s->channel) < 0) {
  833.             res = AVERROR(errno);
  834.             av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_INPUT): %s\n", av_err2str(res));
  835.             return res;
  836.         }
  837.     } else {
  838.         /* get current video input */
  839.         if (v4l2_ioctl(s->fd, VIDIOC_G_INPUT, &s->channel) < 0) {
  840.             res = AVERROR(errno);
  841.             av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_INPUT): %s\n", av_err2str(res));
  842.             return res;
  843.         }
  844.     }
  845.  
  846.     /* enum input */
  847.     input.index = s->channel;
  848.     if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
  849.         res = AVERROR(errno);
  850.         av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMINPUT): %s\n", av_err2str(res));
  851.         return res;
  852.     }
  853.     s->std_id = input.std;
  854.     av_log(s1, AV_LOG_DEBUG, "Current input_channel: %d, input_name: %s, input_std: %"PRIx64"\n",
  855.            s->channel, input.name, (uint64_t)input.std);
  856.  
  857.     if (s->list_format) {
  858.         list_formats(s1, s->fd, s->list_format);
  859.         return AVERROR_EXIT;
  860.     }
  861.  
  862.     if (s->list_standard) {
  863.         list_standards(s1);
  864.         return AVERROR_EXIT;
  865.     }
  866.  
  867.     avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
  868.  
  869.     if (s->pixel_format) {
  870.         AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format);
  871.  
  872.         if (codec)
  873.             s1->video_codec_id = codec->id;
  874.  
  875.         pix_fmt = av_get_pix_fmt(s->pixel_format);
  876.  
  877.         if (pix_fmt == AV_PIX_FMT_NONE && !codec) {
  878.             av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n",
  879.                    s->pixel_format);
  880.  
  881.             return AVERROR(EINVAL);
  882.         }
  883.     }
  884.  
  885.     if (!s->width && !s->height) {
  886.         struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
  887.  
  888.         av_log(s1, AV_LOG_VERBOSE,
  889.                "Querying the device for the current frame size\n");
  890.         if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
  891.             res = AVERROR(errno);
  892.             av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res));
  893.             return res;
  894.         }
  895.  
  896.         s->width  = fmt.fmt.pix.width;
  897.         s->height = fmt.fmt.pix.height;
  898.         av_log(s1, AV_LOG_VERBOSE,
  899.                "Setting frame size to %dx%d\n", s->width, s->height);
  900.     }
  901.  
  902.     res = device_try_init(s1, pix_fmt, &s->width, &s->height, &desired_format, &codec_id);
  903.     if (res < 0) {
  904.         v4l2_close(s->fd);
  905.         return res;
  906.     }
  907.  
  908.     /* If no pixel_format was specified, the codec_id was not known up
  909.      * until now. Set video_codec_id in the context, as codec_id will
  910.      * not be available outside this function
  911.      */
  912.     if (codec_id != AV_CODEC_ID_NONE && s1->video_codec_id == AV_CODEC_ID_NONE)
  913.         s1->video_codec_id = codec_id;
  914.  
  915.     if ((res = av_image_check_size(s->width, s->height, 0, s1)) < 0)
  916.         return res;
  917.  
  918.     s->frame_format = desired_format;
  919.  
  920.     if ((res = v4l2_set_parameters(s1)) < 0)
  921.         return res;
  922.  
  923.     st->codec->pix_fmt = avpriv_fmt_v4l2ff(desired_format, codec_id);
  924.     s->frame_size =
  925.         avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
  926.  
  927.     if ((res = mmap_init(s1)) ||
  928.         (res = mmap_start(s1)) < 0) {
  929.         v4l2_close(s->fd);
  930.         return res;
  931.     }
  932.  
  933.     s->top_field_first = first_field(s, s->fd);
  934.  
  935.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  936.     st->codec->codec_id = codec_id;
  937.     if (codec_id == AV_CODEC_ID_RAWVIDEO)
  938.         st->codec->codec_tag =
  939.             avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
  940.     else if (codec_id == AV_CODEC_ID_H264) {
  941.         st->need_parsing = AVSTREAM_PARSE_HEADERS;
  942.     }
  943.     if (desired_format == V4L2_PIX_FMT_YVU420)
  944.         st->codec->codec_tag = MKTAG('Y', 'V', '1', '2');
  945.     else if (desired_format == V4L2_PIX_FMT_YVU410)
  946.         st->codec->codec_tag = MKTAG('Y', 'V', 'U', '9');
  947.     st->codec->width = s->width;
  948.     st->codec->height = s->height;
  949.     st->codec->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
  950.  
  951.     return 0;
  952. }
  953.  
  954. static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
  955. {
  956.     struct video_data *s = s1->priv_data;
  957.     AVFrame *frame = s1->streams[0]->codec->coded_frame;
  958.     int res;
  959.  
  960.     av_init_packet(pkt);
  961.     if ((res = mmap_read_frame(s1, pkt)) < 0) {
  962.         return res;
  963.     }
  964.  
  965.     if (frame && s->interlaced) {
  966.         frame->interlaced_frame = 1;
  967.         frame->top_field_first = s->top_field_first;
  968.     }
  969.  
  970.     return pkt->size;
  971. }
  972.  
  973. static int v4l2_read_close(AVFormatContext *s1)
  974. {
  975.     struct video_data *s = s1->priv_data;
  976.  
  977.     if (avpriv_atomic_int_get(&s->buffers_queued) != s->buffers)
  978.         av_log(s1, AV_LOG_WARNING, "Some buffers are still owned by the caller on "
  979.                "close.\n");
  980.  
  981.     mmap_close(s);
  982.  
  983.     v4l2_close(s->fd);
  984.     return 0;
  985. }
  986.  
  987. #define OFFSET(x) offsetof(struct video_data, x)
  988. #define DEC AV_OPT_FLAG_DECODING_PARAM
  989.  
  990. static const AVOption options[] = {
  991.     { "standard",     "set TV standard, used only by analog frame grabber",       OFFSET(standard),     AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0,       DEC },
  992.     { "channel",      "set TV channel, used only by frame grabber",               OFFSET(channel),      AV_OPT_TYPE_INT,    {.i64 = -1 },  -1, INT_MAX, DEC },
  993.     { "video_size",   "set frame size",                                           OFFSET(width),        AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL},  0, 0,   DEC },
  994.     { "pixel_format", "set preferred pixel format",                               OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
  995.     { "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
  996.     { "framerate",    "set frame rate",                                           OFFSET(framerate),    AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
  997.  
  998.     { "list_formats", "list available formats and exit",                          OFFSET(list_format),  AV_OPT_TYPE_INT,    {.i64 = 0 },  0, INT_MAX, DEC, "list_formats" },
  999.     { "all",          "show all available formats",                               OFFSET(list_format),  AV_OPT_TYPE_CONST,  {.i64 = V4L_ALLFORMATS  },    0, INT_MAX, DEC, "list_formats" },
  1000.     { "raw",          "show only non-compressed formats",                         OFFSET(list_format),  AV_OPT_TYPE_CONST,  {.i64 = V4L_RAWFORMATS  },    0, INT_MAX, DEC, "list_formats" },
  1001.     { "compressed",   "show only compressed formats",                             OFFSET(list_format),  AV_OPT_TYPE_CONST,  {.i64 = V4L_COMPFORMATS },    0, INT_MAX, DEC, "list_formats" },
  1002.  
  1003.     { "list_standards", "list supported standards and exit",                      OFFSET(list_standard), AV_OPT_TYPE_INT,   {.i64 = 0 },  0, 1, DEC, "list_standards" },
  1004.     { "all",            "show all supported standards",                           OFFSET(list_standard), AV_OPT_TYPE_CONST, {.i64 = 1 },  0, 0, DEC, "list_standards" },
  1005.  
  1006.     { "timestamps",   "set type of timestamps for grabbed frames",                OFFSET(ts_mode),      AV_OPT_TYPE_INT,    {.i64 = 0 }, 0, 2, DEC, "timestamps" },
  1007.     { "ts",           "set type of timestamps for grabbed frames",                OFFSET(ts_mode),      AV_OPT_TYPE_INT,    {.i64 = 0 }, 0, 2, DEC, "timestamps" },
  1008.     { "default",      "use timestamps from the kernel",                           OFFSET(ts_mode),      AV_OPT_TYPE_CONST,  {.i64 = V4L_TS_DEFAULT  }, 0, 2, DEC, "timestamps" },
  1009.     { "abs",          "use absolute timestamps (wall clock)",                     OFFSET(ts_mode),      AV_OPT_TYPE_CONST,  {.i64 = V4L_TS_ABS      }, 0, 2, DEC, "timestamps" },
  1010.     { "mono2abs",     "force conversion from monotonic to absolute timestamps",   OFFSET(ts_mode),      AV_OPT_TYPE_CONST,  {.i64 = V4L_TS_MONO2ABS }, 0, 2, DEC, "timestamps" },
  1011.     { "use_libv4l2",  "use libv4l2 (v4l-utils) convertion functions",             OFFSET(use_libv4l2),  AV_OPT_TYPE_INT,    {.i64 = 0}, 0, 1, DEC },
  1012.     { NULL },
  1013. };
  1014.  
  1015. static const AVClass v4l2_class = {
  1016.     .class_name = "V4L2 indev",
  1017.     .item_name  = av_default_item_name,
  1018.     .option     = options,
  1019.     .version    = LIBAVUTIL_VERSION_INT,
  1020. };
  1021.  
  1022. AVInputFormat ff_v4l2_demuxer = {
  1023.     .name           = "video4linux2,v4l2",
  1024.     .long_name      = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
  1025.     .priv_data_size = sizeof(struct video_data),
  1026.     .read_header    = v4l2_read_header,
  1027.     .read_packet    = v4l2_read_packet,
  1028.     .read_close     = v4l2_read_close,
  1029.     .flags          = AVFMT_NOFILE,
  1030.     .priv_class     = &v4l2_class,
  1031. };
  1032.