yading@10: /*
yading@10:  * Copyright (c) 2000,2001 Fabrice Bellard
yading@10:  * Copyright (c) 2006 Luca Abeni
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Video4Linux2 grab interface
yading@10:  *
yading@10:  * Part of this file is based on the V4L2 video capture example
yading@10:  * (http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html)
yading@10:  *
yading@10:  * Thanks to Michael Niedermayer for providing the mapping between
yading@10:  * V4L2_PIX_FMT_* and AV_PIX_FMT_*
yading@10:  */
yading@10: 
yading@10: #undef __STRICT_ANSI__ //workaround due to broken kernel headers
yading@10: #include "config.h"
yading@10: #include "libavformat/internal.h"
yading@10: #include <unistd.h>
yading@10: #include <fcntl.h>
yading@10: #include <sys/ioctl.h>
yading@10: #include <sys/mman.h>
yading@10: #include <sys/time.h>
yading@10: #if HAVE_SYS_VIDEOIO_H
yading@10: #include <sys/videoio.h>
yading@10: #else
yading@10: #if HAVE_ASM_TYPES_H
yading@10: #include <asm/types.h>
yading@10: #endif
yading@10: #include <linux/videodev2.h>
yading@10: #endif
yading@10: #include "libavutil/atomic.h"
yading@10: #include "libavutil/avassert.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "libavutil/log.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "avdevice.h"
yading@10: #include "timefilter.h"
yading@10: #include "libavutil/parseutils.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "libavutil/time.h"
yading@10: #include "libavutil/avstring.h"
yading@10: 
yading@10: #if CONFIG_LIBV4L2
yading@10: #include <libv4l2.h>
yading@10: #else
yading@10: #define v4l2_open   open
yading@10: #define v4l2_close  close
yading@10: #define v4l2_dup    dup
yading@10: #define v4l2_ioctl  ioctl
yading@10: #define v4l2_read   read
yading@10: #define v4l2_mmap   mmap
yading@10: #define v4l2_munmap munmap
yading@10: #endif
yading@10: 
yading@10: static const int desired_video_buffers = 256;
yading@10: 
yading@10: #define V4L_ALLFORMATS  3
yading@10: #define V4L_RAWFORMATS  1
yading@10: #define V4L_COMPFORMATS 2
yading@10: 
yading@10: /**
yading@10:  * Return timestamps to the user exactly as returned by the kernel
yading@10:  */
yading@10: #define V4L_TS_DEFAULT  0
yading@10: /**
yading@10:  * Autodetect the kind of timestamps returned by the kernel and convert to
yading@10:  * absolute (wall clock) timestamps.
yading@10:  */
yading@10: #define V4L_TS_ABS      1
yading@10: /**
yading@10:  * Assume kernel timestamps are from the monotonic clock and convert to
yading@10:  * absolute timestamps.
yading@10:  */
yading@10: #define V4L_TS_MONO2ABS 2
yading@10: 
yading@10: /**
yading@10:  * Once the kind of timestamps returned by the kernel have been detected,
yading@10:  * the value of the timefilter (NULL or not) determines whether a conversion
yading@10:  * takes place.
yading@10:  */
yading@10: #define V4L_TS_CONVERT_READY V4L_TS_DEFAULT
yading@10: 
yading@10: struct video_data {
yading@10:     AVClass *class;
yading@10:     int fd;
yading@10:     int frame_format; /* V4L2_PIX_FMT_* */
yading@10:     int width, height;
yading@10:     int frame_size;
yading@10:     int interlaced;
yading@10:     int top_field_first;
yading@10:     int ts_mode;
yading@10:     TimeFilter *timefilter;
yading@10:     int64_t last_time_m;
yading@10: 
yading@10:     int buffers;
yading@10:     volatile int buffers_queued;
yading@10:     void **buf_start;
yading@10:     unsigned int *buf_len;
yading@10:     char *standard;
yading@10:     v4l2_std_id std_id;
yading@10:     int channel;
yading@10:     char *pixel_format; /**< Set by a private option. */
yading@10:     int list_format;    /**< Set by a private option. */
yading@10:     int list_standard;  /**< Set by a private option. */
yading@10:     char *framerate;    /**< Set by a private option. */
yading@10: };
yading@10: 
yading@10: struct buff_data {
yading@10:     struct video_data *s;
yading@10:     int index;
yading@10: };
yading@10: 
yading@10: struct fmt_map {
yading@10:     enum AVPixelFormat ff_fmt;
yading@10:     enum AVCodecID codec_id;
yading@10:     uint32_t v4l2_fmt;
yading@10: };
yading@10: 
yading@10: static struct fmt_map fmt_conversion_table[] = {
yading@10:     //ff_fmt           codec_id           v4l2_fmt
yading@10:     { AV_PIX_FMT_YUV420P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420  },
yading@10:     { AV_PIX_FMT_YUV420P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YVU420  },
yading@10:     { AV_PIX_FMT_YUV422P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P },
yading@10:     { AV_PIX_FMT_YUYV422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV    },
yading@10:     { AV_PIX_FMT_UYVY422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY    },
yading@10:     { AV_PIX_FMT_YUV411P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P },
yading@10:     { AV_PIX_FMT_YUV410P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410  },
yading@10:     { AV_PIX_FMT_YUV410P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YVU410  },
yading@10:     { AV_PIX_FMT_RGB555LE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555  },
yading@10:     { AV_PIX_FMT_RGB555BE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555X },
yading@10:     { AV_PIX_FMT_RGB565LE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565  },
yading@10:     { AV_PIX_FMT_RGB565BE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565X },
yading@10:     { AV_PIX_FMT_BGR24,   AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24   },
yading@10:     { AV_PIX_FMT_RGB24,   AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24   },
yading@10:     { AV_PIX_FMT_BGR0,    AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32   },
yading@10:     { AV_PIX_FMT_0RGB,    AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB32   },
yading@10:     { AV_PIX_FMT_GRAY8,   AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY    },
yading@10: #ifdef V4L2_PIX_FMT_Y16
yading@10:     { AV_PIX_FMT_GRAY16LE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_Y16     },
yading@10: #endif
yading@10:     { AV_PIX_FMT_NV12,    AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12    },
yading@10:     { AV_PIX_FMT_NONE,    AV_CODEC_ID_MJPEG,    V4L2_PIX_FMT_MJPEG   },
yading@10:     { AV_PIX_FMT_NONE,    AV_CODEC_ID_MJPEG,    V4L2_PIX_FMT_JPEG    },
yading@10: #ifdef V4L2_PIX_FMT_H264
yading@10:     { AV_PIX_FMT_NONE,    AV_CODEC_ID_H264,     V4L2_PIX_FMT_H264    },
yading@10: #endif
yading@10: #ifdef V4L2_PIX_FMT_CPIA1
yading@10:     { AV_PIX_FMT_NONE,    AV_CODEC_ID_CPIA,     V4L2_PIX_FMT_CPIA1   },
yading@10: #endif
yading@10: };
yading@10: 
yading@10: static int device_open(AVFormatContext *ctx)
yading@10: {
yading@10:     struct v4l2_capability cap;
yading@10:     int fd;
yading@10:     int ret;
yading@10:     int flags = O_RDWR;
yading@10: 
yading@10:     if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
yading@10:         flags |= O_NONBLOCK;
yading@10:     }
yading@10: 
yading@10:     fd = v4l2_open(ctx->filename, flags, 0);
yading@10:     if (fd < 0) {
yading@10:         ret = AVERROR(errno);
yading@10:         av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s: %s\n",
yading@10:                ctx->filename, av_err2str(ret));
yading@10:         return ret;
yading@10:     }
yading@10: 
yading@10:     if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
yading@10:         ret = AVERROR(errno);
yading@10:         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
yading@10:                av_err2str(ret));
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     av_log(ctx, AV_LOG_VERBOSE, "fd:%d capabilities:%x\n",
yading@10:            fd, cap.capabilities);
yading@10: 
yading@10:     if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
yading@10:         ret = AVERROR(ENODEV);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
yading@10:         av_log(ctx, AV_LOG_ERROR,
yading@10:                "The device does not support the streaming I/O method.\n");
yading@10:         ret = AVERROR(ENOSYS);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     return fd;
yading@10: 
yading@10: fail:
yading@10:     v4l2_close(fd);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int device_init(AVFormatContext *ctx, int *width, int *height,
yading@10:                        uint32_t pix_fmt)
yading@10: {
yading@10:     struct video_data *s = ctx->priv_data;
yading@10:     int fd = s->fd;
yading@10:     struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
yading@10:     struct v4l2_pix_format *pix = &fmt.fmt.pix;
yading@10: 
yading@10:     int res = 0;
yading@10: 
yading@10:     pix->width = *width;
yading@10:     pix->height = *height;
yading@10:     pix->pixelformat = pix_fmt;
yading@10:     pix->field = V4L2_FIELD_ANY;
yading@10: 
yading@10:     if (v4l2_ioctl(fd, VIDIOC_S_FMT, &fmt) < 0)
yading@10:         res = AVERROR(errno);
yading@10: 
yading@10:     if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
yading@10:         av_log(ctx, AV_LOG_INFO,
yading@10:                "The V4L2 driver changed the video from %dx%d to %dx%d\n",
yading@10:                *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
yading@10:         *width = fmt.fmt.pix.width;
yading@10:         *height = fmt.fmt.pix.height;
yading@10:     }
yading@10: 
yading@10:     if (pix_fmt != fmt.fmt.pix.pixelformat) {
yading@10:         av_log(ctx, AV_LOG_DEBUG,
yading@10:                "The V4L2 driver changed the pixel format "
yading@10:                "from 0x%08X to 0x%08X\n",
yading@10:                pix_fmt, fmt.fmt.pix.pixelformat);
yading@10:         res = AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
yading@10:         av_log(ctx, AV_LOG_DEBUG,
yading@10:                "The V4L2 driver is using the interlaced mode\n");
yading@10:         s->interlaced = 1;
yading@10:     }
yading@10: 
yading@10:     return res;
yading@10: }
yading@10: 
yading@10: static int first_field(int fd)
yading@10: {
yading@10:     int res;
yading@10:     v4l2_std_id std;
yading@10: 
yading@10:     res = v4l2_ioctl(fd, VIDIOC_G_STD, &std);
yading@10:     if (res < 0) {
yading@10:         return 0;
yading@10:     }
yading@10:     if (std & V4L2_STD_NTSC) {
yading@10:         return 0;
yading@10:     }
yading@10: 
yading@10:     return 1;
yading@10: }
yading@10: 
yading@10: static uint32_t fmt_ff2v4l(enum AVPixelFormat pix_fmt, enum AVCodecID codec_id)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
yading@10:         if ((codec_id == AV_CODEC_ID_NONE ||
yading@10:              fmt_conversion_table[i].codec_id == codec_id) &&
yading@10:             (pix_fmt == AV_PIX_FMT_NONE ||
yading@10:              fmt_conversion_table[i].ff_fmt == pix_fmt)) {
yading@10:             return fmt_conversion_table[i].v4l2_fmt;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static enum AVPixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum AVCodecID codec_id)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
yading@10:         if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt &&
yading@10:             fmt_conversion_table[i].codec_id == codec_id) {
yading@10:             return fmt_conversion_table[i].ff_fmt;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return AV_PIX_FMT_NONE;
yading@10: }
yading@10: 
yading@10: static enum AVCodecID fmt_v4l2codec(uint32_t v4l2_fmt)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
yading@10:         if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt) {
yading@10:             return fmt_conversion_table[i].codec_id;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return AV_CODEC_ID_NONE;
yading@10: }
yading@10: 
yading@10: #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
yading@10: static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat)
yading@10: {
yading@10:     struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
yading@10: 
yading@10:     while(!v4l2_ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
yading@10:         switch (vfse.type) {
yading@10:         case V4L2_FRMSIZE_TYPE_DISCRETE:
yading@10:             av_log(ctx, AV_LOG_INFO, " %ux%u",
yading@10:                    vfse.discrete.width, vfse.discrete.height);
yading@10:         break;
yading@10:         case V4L2_FRMSIZE_TYPE_CONTINUOUS:
yading@10:         case V4L2_FRMSIZE_TYPE_STEPWISE:
yading@10:             av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
yading@10:                    vfse.stepwise.min_width,
yading@10:                    vfse.stepwise.max_width,
yading@10:                    vfse.stepwise.step_width,
yading@10:                    vfse.stepwise.min_height,
yading@10:                    vfse.stepwise.max_height,
yading@10:                    vfse.stepwise.step_height);
yading@10:         }
yading@10:         vfse.index++;
yading@10:     }
yading@10: }
yading@10: #endif
yading@10: 
yading@10: static void list_formats(AVFormatContext *ctx, int fd, int type)
yading@10: {
yading@10:     struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
yading@10: 
yading@10:     while(!v4l2_ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) {
yading@10:         enum AVCodecID codec_id = fmt_v4l2codec(vfd.pixelformat);
yading@10:         enum AVPixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id);
yading@10: 
yading@10:         vfd.index++;
yading@10: 
yading@10:         if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
yading@10:             type & V4L_RAWFORMATS) {
yading@10:             const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
yading@10:             av_log(ctx, AV_LOG_INFO, "Raw       : %9s : %20s :",
yading@10:                    fmt_name ? fmt_name : "Unsupported",
yading@10:                    vfd.description);
yading@10:         } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
yading@10:                    type & V4L_COMPFORMATS) {
yading@10:             AVCodec *codec = avcodec_find_decoder(codec_id);
yading@10:             av_log(ctx, AV_LOG_INFO, "Compressed: %9s : %20s :",
yading@10:                    codec ? codec->name : "Unsupported",
yading@10:                    vfd.description);
yading@10:         } else {
yading@10:             continue;
yading@10:         }
yading@10: 
yading@10: #ifdef V4L2_FMT_FLAG_EMULATED
yading@10:         if (vfd.flags & V4L2_FMT_FLAG_EMULATED)
yading@10:             av_log(ctx, AV_LOG_INFO, " Emulated :");
yading@10: #endif
yading@10: #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
yading@10:         list_framesizes(ctx, fd, vfd.pixelformat);
yading@10: #endif
yading@10:         av_log(ctx, AV_LOG_INFO, "\n");
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void list_standards(AVFormatContext *ctx)
yading@10: {
yading@10:     int ret;
yading@10:     struct video_data *s = ctx->priv_data;
yading@10:     struct v4l2_standard standard;
yading@10: 
yading@10:     if (s->std_id == 0)
yading@10:         return;
yading@10: 
yading@10:     for (standard.index = 0; ; standard.index++) {
yading@10:         if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
yading@10:             ret = AVERROR(errno);
yading@10:             if (ret == AVERROR(EINVAL)) {
yading@10:                 break;
yading@10:             } else {
yading@10:                 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
yading@10:                 return;
yading@10:             }
yading@10:         }
yading@10:         av_log(ctx, AV_LOG_INFO, "%2d, %16llx, %s\n",
yading@10:                standard.index, standard.id, standard.name);
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int mmap_init(AVFormatContext *ctx)
yading@10: {
yading@10:     int i, res;
yading@10:     struct video_data *s = ctx->priv_data;
yading@10:     struct v4l2_requestbuffers req = {
yading@10:         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
yading@10:         .count  = desired_video_buffers,
yading@10:         .memory = V4L2_MEMORY_MMAP
yading@10:     };
yading@10: 
yading@10:     if (v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req) < 0) {
yading@10:         res = AVERROR(errno);
yading@10:         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS): %s\n", av_err2str(res));
yading@10:         return res;
yading@10:     }
yading@10: 
yading@10:     if (req.count < 2) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10:     s->buffers = req.count;
yading@10:     s->buf_start = av_malloc(sizeof(void *) * s->buffers);
yading@10:     if (s->buf_start == NULL) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10:     s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
yading@10:     if (s->buf_len == NULL) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
yading@10:         av_free(s->buf_start);
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10: 
yading@10:     for (i = 0; i < req.count; i++) {
yading@10:         struct v4l2_buffer buf = {
yading@10:             .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
yading@10:             .index  = i,
yading@10:             .memory = V4L2_MEMORY_MMAP
yading@10:         };
yading@10:         if (v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf) < 0) {
yading@10:             res = AVERROR(errno);
yading@10:             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF): %s\n", av_err2str(res));
yading@10:             return res;
yading@10:         }
yading@10: 
yading@10:         s->buf_len[i] = buf.length;
yading@10:         if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
yading@10:             av_log(ctx, AV_LOG_ERROR,
yading@10:                    "buf_len[%d] = %d < expected frame size %d\n",
yading@10:                    i, s->buf_len[i], s->frame_size);
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:         s->buf_start[i] = v4l2_mmap(NULL, buf.length,
yading@10:                                PROT_READ | PROT_WRITE, MAP_SHARED,
yading@10:                                s->fd, buf.m.offset);
yading@10: 
yading@10:         if (s->buf_start[i] == MAP_FAILED) {
yading@10:             res = AVERROR(errno);
yading@10:             av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", av_err2str(res));
yading@10:             return res;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #if FF_API_DESTRUCT_PACKET
yading@10: static void dummy_release_buffer(AVPacket *pkt)
yading@10: {
yading@10:     av_assert0(0);
yading@10: }
yading@10: #endif
yading@10: 
yading@10: static void mmap_release_buffer(void *opaque, uint8_t *data)
yading@10: {
yading@10:     struct v4l2_buffer buf = { 0 };
yading@10:     int res;
yading@10:     struct buff_data *buf_descriptor = opaque;
yading@10:     struct video_data *s = buf_descriptor->s;
yading@10: 
yading@10:     buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
yading@10:     buf.memory = V4L2_MEMORY_MMAP;
yading@10:     buf.index = buf_descriptor->index;
yading@10:     av_free(buf_descriptor);
yading@10: 
yading@10:     if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
yading@10:         res = AVERROR(errno);
yading@10:         av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
yading@10:                av_err2str(res));
yading@10:     }
yading@10: 
yading@10:     avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
yading@10: }
yading@10: 
yading@10: #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
yading@10: static int64_t av_gettime_monotonic(void)
yading@10: {
yading@10:     struct timespec tv;
yading@10: 
yading@10:     clock_gettime(CLOCK_MONOTONIC, &tv);
yading@10:     return (int64_t)tv.tv_sec * 1000000 + tv.tv_nsec / 1000;
yading@10: }
yading@10: #endif
yading@10: 
yading@10: static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts)
yading@10: {
yading@10:     struct video_data *s = ctx->priv_data;
yading@10:     int64_t now;
yading@10: 
yading@10:     now = av_gettime();
yading@10:     if (s->ts_mode == V4L_TS_ABS &&
yading@10:         ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) {
yading@10:         av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n");
yading@10:         s->ts_mode = V4L_TS_CONVERT_READY;
yading@10:         return 0;
yading@10:     }
yading@10: #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
yading@10:     now = av_gettime_monotonic();
yading@10:     if (s->ts_mode == V4L_TS_MONO2ABS ||
yading@10:         (ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) {
yading@10:         AVRational tb = {AV_TIME_BASE, 1};
yading@10:         int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate);
yading@10:         av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n");
yading@10:         /* microseconds instead of seconds, MHz instead of Hz */
yading@10:         s->timefilter = ff_timefilter_new(1, period, 1.0E-6);
yading@10:         s->ts_mode = V4L_TS_CONVERT_READY;
yading@10:         return 0;
yading@10:     }
yading@10: #endif
yading@10:     av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n");
yading@10:     return AVERROR(EIO);
yading@10: }
yading@10: 
yading@10: static int convert_timestamp(AVFormatContext *ctx, int64_t *ts)
yading@10: {
yading@10:     struct video_data *s = ctx->priv_data;
yading@10: 
yading@10:     if (s->ts_mode) {
yading@10:         int r = init_convert_timestamp(ctx, *ts);
yading@10:         if (r < 0)
yading@10:             return r;
yading@10:     }
yading@10: #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
yading@10:     if (s->timefilter) {
yading@10:         int64_t nowa = av_gettime();
yading@10:         int64_t nowm = av_gettime_monotonic();
yading@10:         ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m);
yading@10:         s->last_time_m = nowm;
yading@10:         *ts = ff_timefilter_eval(s->timefilter, *ts - nowm);
yading@10:     }
yading@10: #endif
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
yading@10: {
yading@10:     struct video_data *s = ctx->priv_data;
yading@10:     struct v4l2_buffer buf = {
yading@10:         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
yading@10:         .memory = V4L2_MEMORY_MMAP
yading@10:     };
yading@10:     int res;
yading@10: 
yading@10:     /* FIXME: Some special treatment might be needed in case of loss of signal... */
yading@10:     while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
yading@10:     if (res < 0) {
yading@10:         if (errno == EAGAIN) {
yading@10:             pkt->size = 0;
yading@10:             return AVERROR(EAGAIN);
yading@10:         }
yading@10:         res = AVERROR(errno);
yading@10:         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", av_err2str(res));
yading@10:         return res;
yading@10:     }
yading@10: 
yading@10:     if (buf.index >= s->buffers) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     avpriv_atomic_int_add_and_fetch(&s->buffers_queued, -1);
yading@10:     // always keep at least one buffer queued
yading@10:     av_assert0(avpriv_atomic_int_get(&s->buffers_queued) >= 1);
yading@10: 
yading@10:     /* CPIA is a compressed format and we don't know the exact number of bytes
yading@10:      * used by a frame, so set it here as the driver announces it.
yading@10:      */
yading@10:     if (ctx->video_codec_id == AV_CODEC_ID_CPIA)
yading@10:         s->frame_size = buf.bytesused;
yading@10: 
yading@10:     if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
yading@10:         av_log(ctx, AV_LOG_ERROR,
yading@10:                "The v4l2 frame is %d bytes, but %d bytes are expected\n",
yading@10:                buf.bytesused, s->frame_size);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     /* Image is at s->buff_start[buf.index] */
yading@10:     if (avpriv_atomic_int_get(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
yading@10:         /* when we start getting low on queued buffers, fallback to copying data */
yading@10:         res = av_new_packet(pkt, buf.bytesused);
yading@10:         if (res < 0) {
yading@10:             av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
yading@10:             if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0)
yading@10:                 avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
yading@10:             return res;
yading@10:         }
yading@10:         memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused);
yading@10: 
yading@10:         if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
yading@10:             res = AVERROR(errno);
yading@10:             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res));
yading@10:             av_free_packet(pkt);
yading@10:             return res;
yading@10:         }
yading@10:         avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
yading@10:     } else {
yading@10:         struct buff_data *buf_descriptor;
yading@10: 
yading@10:         pkt->data     = s->buf_start[buf.index];
yading@10:         pkt->size     = buf.bytesused;
yading@10: #if FF_API_DESTRUCT_PACKET
yading@10:         pkt->destruct = dummy_release_buffer;
yading@10: #endif
yading@10: 
yading@10:         buf_descriptor = av_malloc(sizeof(struct buff_data));
yading@10:         if (buf_descriptor == NULL) {
yading@10:             /* Something went wrong... Since av_malloc() failed, we cannot even
yading@10:              * allocate a buffer for memcpying into it
yading@10:              */
yading@10:             av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
yading@10:             if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0)
yading@10:                 avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
yading@10: 
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:         buf_descriptor->index = buf.index;
yading@10:         buf_descriptor->s     = s;
yading@10: 
yading@10:         pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer,
yading@10:                                     buf_descriptor, 0);
yading@10:         if (!pkt->buf) {
yading@10:             av_log(ctx, AV_LOG_ERROR, "Failed to create a buffer\n");
yading@10:             if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0)
yading@10:                 avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
yading@10:             av_freep(&buf_descriptor);
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:     }
yading@10:     pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
yading@10:     convert_timestamp(ctx, &pkt->pts);
yading@10: 
yading@10:     return s->buf_len[buf.index];
yading@10: }
yading@10: 
yading@10: static int mmap_start(AVFormatContext *ctx)
yading@10: {
yading@10:     struct video_data *s = ctx->priv_data;
yading@10:     enum v4l2_buf_type type;
yading@10:     int i, res;
yading@10: 
yading@10:     for (i = 0; i < s->buffers; i++) {
yading@10:         struct v4l2_buffer buf = {
yading@10:             .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
yading@10:             .index  = i,
yading@10:             .memory = V4L2_MEMORY_MMAP
yading@10:         };
yading@10: 
yading@10:         if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
yading@10:             res = AVERROR(errno);
yading@10:             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res));
yading@10:             return res;
yading@10:         }
yading@10:     }
yading@10:     s->buffers_queued = s->buffers;
yading@10: 
yading@10:     type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
yading@10:     if (v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type) < 0) {
yading@10:         res = AVERROR(errno);
yading@10:         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", av_err2str(res));
yading@10:         return res;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static void mmap_close(struct video_data *s)
yading@10: {
yading@10:     enum v4l2_buf_type type;
yading@10:     int i;
yading@10: 
yading@10:     type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
yading@10:     /* We do not check for the result, because we could
yading@10:      * not do anything about it anyway...
yading@10:      */
yading@10:     v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
yading@10:     for (i = 0; i < s->buffers; i++) {
yading@10:         v4l2_munmap(s->buf_start[i], s->buf_len[i]);
yading@10:     }
yading@10:     av_free(s->buf_start);
yading@10:     av_free(s->buf_len);
yading@10: }
yading@10: 
yading@10: static int v4l2_set_parameters(AVFormatContext *s1)
yading@10: {
yading@10:     struct video_data *s = s1->priv_data;
yading@10:     struct v4l2_standard standard = { 0 };
yading@10:     struct v4l2_streamparm streamparm = { 0 };
yading@10:     struct v4l2_fract *tpf;
yading@10:     AVRational framerate_q = { 0 };
yading@10:     int i, ret;
yading@10: 
yading@10:     if (s->framerate &&
yading@10:         (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
yading@10:         av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
yading@10:                s->framerate);
yading@10:         return ret;
yading@10:     }
yading@10: 
yading@10:     if (s->standard) {
yading@10:         if (s->std_id) {
yading@10:             ret = 0;
yading@10:             av_log(s1, AV_LOG_DEBUG, "Setting standard: %s\n", s->standard);
yading@10:             /* set tv standard */
yading@10:             for (i = 0; ; i++) {
yading@10:                 standard.index = i;
yading@10:                 if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
yading@10:                     ret = AVERROR(errno);
yading@10:                     break;
yading@10:                 }
yading@10:                 if (!av_strcasecmp(standard.name, s->standard))
yading@10:                     break;
yading@10:             }
yading@10:             if (ret < 0) {
yading@10:                 av_log(s1, AV_LOG_ERROR, "Unknown or unsupported standard '%s'\n", s->standard);
yading@10:                 return ret;
yading@10:             }
yading@10: 
yading@10:             if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
yading@10:                 ret = AVERROR(errno);
yading@10:                 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_STD): %s\n", av_err2str(ret));
yading@10:                 return ret;
yading@10:             }
yading@10:         } else {
yading@10:             av_log(s1, AV_LOG_WARNING,
yading@10:                    "This device does not support any standard\n");
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* get standard */
yading@10:     if (v4l2_ioctl(s->fd, VIDIOC_G_STD, &s->std_id) == 0) {
yading@10:         tpf = &standard.frameperiod;
yading@10:         for (i = 0; ; i++) {
yading@10:             standard.index = i;
yading@10:             if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
yading@10:                 ret = AVERROR(errno);
yading@10:                 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
yading@10:                 return ret;
yading@10:             }
yading@10:             if (standard.id == s->std_id) {
yading@10:                 av_log(s1, AV_LOG_DEBUG,
yading@10:                        "Current standard: %s, id: %"PRIu64", frameperiod: %d/%d\n",
yading@10:                        standard.name, (uint64_t)standard.id, tpf->numerator, tpf->denominator);
yading@10:                 break;
yading@10:             }
yading@10:         }
yading@10:     } else {
yading@10:         tpf = &streamparm.parm.capture.timeperframe;
yading@10:     }
yading@10: 
yading@10:     streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
yading@10:     if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) {
yading@10:         ret = AVERROR(errno);
yading@10:         av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret));
yading@10:         return ret;
yading@10:     }
yading@10: 
yading@10:     if (framerate_q.num && framerate_q.den) {
yading@10:         if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) {
yading@10:             tpf = &streamparm.parm.capture.timeperframe;
yading@10: 
yading@10:             av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
yading@10:                    framerate_q.den, framerate_q.num);
yading@10:             tpf->numerator   = framerate_q.den;
yading@10:             tpf->denominator = framerate_q.num;
yading@10: 
yading@10:             if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) < 0) {
yading@10:                 ret = AVERROR(errno);
yading@10:                 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_PARM): %s\n", av_err2str(ret));
yading@10:                 return ret;
yading@10:             }
yading@10: 
yading@10:             if (framerate_q.num != tpf->denominator ||
yading@10:                 framerate_q.den != tpf->numerator) {
yading@10:                 av_log(s1, AV_LOG_INFO,
yading@10:                        "The driver changed the time per frame from "
yading@10:                        "%d/%d to %d/%d\n",
yading@10:                        framerate_q.den, framerate_q.num,
yading@10:                        tpf->numerator, tpf->denominator);
yading@10:             }
yading@10:         } else {
yading@10:             av_log(s1, AV_LOG_WARNING,
yading@10:                    "The driver does not allow to change time per frame\n");
yading@10:         }
yading@10:     }
yading@10:     s1->streams[0]->avg_frame_rate.num = tpf->denominator;
yading@10:     s1->streams[0]->avg_frame_rate.den = tpf->numerator;
yading@10:     s1->streams[0]->r_frame_rate = s1->streams[0]->avg_frame_rate;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int device_try_init(AVFormatContext *s1,
yading@10:                            enum AVPixelFormat pix_fmt,
yading@10:                            int *width,
yading@10:                            int *height,
yading@10:                            uint32_t *desired_format,
yading@10:                            enum AVCodecID *codec_id)
yading@10: {
yading@10:     int ret, i;
yading@10: 
yading@10:     *desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id);
yading@10: 
yading@10:     if (*desired_format) {
yading@10:         ret = device_init(s1, width, height, *desired_format);
yading@10:         if (ret < 0) {
yading@10:             *desired_format = 0;
yading@10:             if (ret != AVERROR(EINVAL))
yading@10:                 return ret;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (!*desired_format) {
yading@10:         for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
yading@10:             if (s1->video_codec_id == AV_CODEC_ID_NONE ||
yading@10:                 fmt_conversion_table[i].codec_id == s1->video_codec_id) {
yading@10:                 av_log(s1, AV_LOG_DEBUG, "Trying to set codec:%s pix_fmt:%s\n",
yading@10:                        avcodec_get_name(fmt_conversion_table[i].codec_id),
yading@10:                        (char *)av_x_if_null(av_get_pix_fmt_name(fmt_conversion_table[i].ff_fmt), "none"));
yading@10: 
yading@10:                 *desired_format = fmt_conversion_table[i].v4l2_fmt;
yading@10:                 ret = device_init(s1, width, height, *desired_format);
yading@10:                 if (ret >= 0)
yading@10:                     break;
yading@10:                 else if (ret != AVERROR(EINVAL))
yading@10:                     return ret;
yading@10:                 *desired_format = 0;
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         if (*desired_format == 0) {
yading@10:             av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
yading@10:                    "codec '%s' (id %d), pixel format '%s' (id %d)\n",
yading@10:                    avcodec_get_name(s1->video_codec_id), s1->video_codec_id,
yading@10:                    (char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt), "none"), pix_fmt);
yading@10:             ret = AVERROR(EINVAL);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     *codec_id = fmt_v4l2codec(*desired_format);
yading@10:     av_assert0(*codec_id != AV_CODEC_ID_NONE);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int v4l2_read_header(AVFormatContext *s1)
yading@10: {
yading@10:     struct video_data *s = s1->priv_data;
yading@10:     AVStream *st;
yading@10:     int res = 0;
yading@10:     uint32_t desired_format;
yading@10:     enum AVCodecID codec_id = AV_CODEC_ID_NONE;
yading@10:     enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
yading@10:     struct v4l2_input input = { 0 };
yading@10: 
yading@10:     st = avformat_new_stream(s1, NULL);
yading@10:     if (!st)
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10: #if CONFIG_LIBV4L2
yading@10:     /* silence libv4l2 logging. if fopen() fails v4l2_log_file will be NULL
yading@10:        and errors will get sent to stderr */
yading@10:     v4l2_log_file = fopen("/dev/null", "w");
yading@10: #endif
yading@10: 
yading@10:     s->fd = device_open(s1);
yading@10:     if (s->fd < 0)
yading@10:         return s->fd;
yading@10: 
yading@10:     if (s->channel != -1) {
yading@10:         /* set video input */
yading@10:         av_log(s1, AV_LOG_DEBUG, "Selecting input_channel: %d\n", s->channel);
yading@10:         if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &s->channel) < 0) {
yading@10:             res = AVERROR(errno);
yading@10:             av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_INPUT): %s\n", av_err2str(res));
yading@10:             return res;
yading@10:         }
yading@10:     } else {
yading@10:         /* get current video input */
yading@10:         if (v4l2_ioctl(s->fd, VIDIOC_G_INPUT, &s->channel) < 0) {
yading@10:             res = AVERROR(errno);
yading@10:             av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_INPUT): %s\n", av_err2str(res));
yading@10:             return res;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* enum input */
yading@10:     input.index = s->channel;
yading@10:     if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
yading@10:         res = AVERROR(errno);
yading@10:         av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMINPUT): %s\n", av_err2str(res));
yading@10:         return res;
yading@10:     }
yading@10:     s->std_id = input.std;
yading@10:     av_log(s1, AV_LOG_DEBUG, "Current input_channel: %d, input_name: %s\n",
yading@10:            s->channel, input.name);
yading@10: 
yading@10:     if (s->list_format) {
yading@10:         list_formats(s1, s->fd, s->list_format);
yading@10:         return AVERROR_EXIT;
yading@10:     }
yading@10: 
yading@10:     if (s->list_standard) {
yading@10:         list_standards(s1);
yading@10:         return AVERROR_EXIT;
yading@10:     }
yading@10: 
yading@10:     avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
yading@10: 
yading@10:     if (s->pixel_format) {
yading@10:         AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format);
yading@10: 
yading@10:         if (codec)
yading@10:             s1->video_codec_id = codec->id;
yading@10: 
yading@10:         pix_fmt = av_get_pix_fmt(s->pixel_format);
yading@10: 
yading@10:         if (pix_fmt == AV_PIX_FMT_NONE && !codec) {
yading@10:             av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n",
yading@10:                    s->pixel_format);
yading@10: 
yading@10:             return AVERROR(EINVAL);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (!s->width && !s->height) {
yading@10:         struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
yading@10: 
yading@10:         av_log(s1, AV_LOG_VERBOSE,
yading@10:                "Querying the device for the current frame size\n");
yading@10:         if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
yading@10:             res = AVERROR(errno);
yading@10:             av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res));
yading@10:             return res;
yading@10:         }
yading@10: 
yading@10:         s->width  = fmt.fmt.pix.width;
yading@10:         s->height = fmt.fmt.pix.height;
yading@10:         av_log(s1, AV_LOG_VERBOSE,
yading@10:                "Setting frame size to %dx%d\n", s->width, s->height);
yading@10:     }
yading@10: 
yading@10:     res = device_try_init(s1, pix_fmt, &s->width, &s->height, &desired_format, &codec_id);
yading@10:     if (res < 0) {
yading@10:         v4l2_close(s->fd);
yading@10:         return res;
yading@10:     }
yading@10: 
yading@10:     /* If no pixel_format was specified, the codec_id was not known up
yading@10:      * until now. Set video_codec_id in the context, as codec_id will
yading@10:      * not be available outside this function
yading@10:      */
yading@10:     if (codec_id != AV_CODEC_ID_NONE && s1->video_codec_id == AV_CODEC_ID_NONE)
yading@10:         s1->video_codec_id = codec_id;
yading@10: 
yading@10:     if ((res = av_image_check_size(s->width, s->height, 0, s1)) < 0)
yading@10:         return res;
yading@10: 
yading@10:     s->frame_format = desired_format;
yading@10: 
yading@10:     if ((res = v4l2_set_parameters(s1)) < 0)
yading@10:         return res;
yading@10: 
yading@10:     st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
yading@10:     s->frame_size =
yading@10:         avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
yading@10: 
yading@10:     if ((res = mmap_init(s1)) ||
yading@10:         (res = mmap_start(s1)) < 0) {
yading@10:         v4l2_close(s->fd);
yading@10:         return res;
yading@10:     }
yading@10: 
yading@10:     s->top_field_first = first_field(s->fd);
yading@10: 
yading@10:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@10:     st->codec->codec_id = codec_id;
yading@10:     if (codec_id == AV_CODEC_ID_RAWVIDEO)
yading@10:         st->codec->codec_tag =
yading@10:             avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
yading@10:     if (desired_format == V4L2_PIX_FMT_YVU420)
yading@10:         st->codec->codec_tag = MKTAG('Y', 'V', '1', '2');
yading@10:     else if (desired_format == V4L2_PIX_FMT_YVU410)
yading@10:         st->codec->codec_tag = MKTAG('Y', 'V', 'U', '9');
yading@10:     st->codec->width = s->width;
yading@10:     st->codec->height = s->height;
yading@10:     st->codec->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
yading@10: {
yading@10:     struct video_data *s = s1->priv_data;
yading@10:     AVFrame *frame = s1->streams[0]->codec->coded_frame;
yading@10:     int res;
yading@10: 
yading@10:     av_init_packet(pkt);
yading@10:     if ((res = mmap_read_frame(s1, pkt)) < 0) {
yading@10:         return res;
yading@10:     }
yading@10: 
yading@10:     if (frame && s->interlaced) {
yading@10:         frame->interlaced_frame = 1;
yading@10:         frame->top_field_first = s->top_field_first;
yading@10:     }
yading@10: 
yading@10:     return pkt->size;
yading@10: }
yading@10: 
yading@10: static int v4l2_read_close(AVFormatContext *s1)
yading@10: {
yading@10:     struct video_data *s = s1->priv_data;
yading@10: 
yading@10:     if (avpriv_atomic_int_get(&s->buffers_queued) != s->buffers)
yading@10:         av_log(s1, AV_LOG_WARNING, "Some buffers are still owned by the caller on "
yading@10:                "close.\n");
yading@10: 
yading@10:     mmap_close(s);
yading@10: 
yading@10:     v4l2_close(s->fd);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #define OFFSET(x) offsetof(struct video_data, x)
yading@10: #define DEC AV_OPT_FLAG_DECODING_PARAM
yading@10: 
yading@10: static const AVOption options[] = {
yading@10:     { "standard",     "set TV standard, used only by analog frame grabber",       OFFSET(standard),     AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0,       DEC },
yading@10:     { "channel",      "set TV channel, used only by frame grabber",               OFFSET(channel),      AV_OPT_TYPE_INT,    {.i64 = -1 },  -1, INT_MAX, DEC },
yading@10:     { "video_size",   "set frame size",                                           OFFSET(width),        AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL},  0, 0,   DEC },
yading@10:     { "pixel_format", "set preferred pixel format",                               OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
yading@10:     { "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
yading@10:     { "framerate",    "set frame rate",                                           OFFSET(framerate),    AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
yading@10: 
yading@10:     { "list_formats", "list available formats and exit",                          OFFSET(list_format),  AV_OPT_TYPE_INT,    {.i64 = 0 },  0, INT_MAX, DEC, "list_formats" },
yading@10:     { "all",          "show all available formats",                               OFFSET(list_format),  AV_OPT_TYPE_CONST,  {.i64 = V4L_ALLFORMATS  },    0, INT_MAX, DEC, "list_formats" },
yading@10:     { "raw",          "show only non-compressed formats",                         OFFSET(list_format),  AV_OPT_TYPE_CONST,  {.i64 = V4L_RAWFORMATS  },    0, INT_MAX, DEC, "list_formats" },
yading@10:     { "compressed",   "show only compressed formats",                             OFFSET(list_format),  AV_OPT_TYPE_CONST,  {.i64 = V4L_COMPFORMATS },    0, INT_MAX, DEC, "list_formats" },
yading@10: 
yading@10:     { "list_standards", "list supported standards and exit",                      OFFSET(list_standard), AV_OPT_TYPE_INT,   {.i64 = 0 },  0, 1, DEC, "list_standards" },
yading@10:     { "all",            "show all supported standards",                           OFFSET(list_standard), AV_OPT_TYPE_CONST, {.i64 = 1 },  0, 0, DEC, "list_standards" },
yading@10: 
yading@10:     { "timestamps",   "set type of timestamps for grabbed frames",                OFFSET(ts_mode),      AV_OPT_TYPE_INT,    {.i64 = 0 }, 0, 2, DEC, "timestamps" },
yading@10:     { "ts",           "set type of timestamps for grabbed frames",                OFFSET(ts_mode),      AV_OPT_TYPE_INT,    {.i64 = 0 }, 0, 2, DEC, "timestamps" },
yading@10:     { "default",      "use timestamps from the kernel",                           OFFSET(ts_mode),      AV_OPT_TYPE_CONST,  {.i64 = V4L_TS_DEFAULT  }, 0, 2, DEC, "timestamps" },
yading@10:     { "abs",          "use absolute timestamps (wall clock)",                     OFFSET(ts_mode),      AV_OPT_TYPE_CONST,  {.i64 = V4L_TS_ABS      }, 0, 2, DEC, "timestamps" },
yading@10:     { "mono2abs",     "force conversion from monotonic to absolute timestamps",   OFFSET(ts_mode),      AV_OPT_TYPE_CONST,  {.i64 = V4L_TS_MONO2ABS }, 0, 2, DEC, "timestamps" },
yading@10: 
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: static const AVClass v4l2_class = {
yading@10:     .class_name = "V4L2 indev",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: AVInputFormat ff_v4l2_demuxer = {
yading@10:     .name           = "video4linux2,v4l2",
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
yading@10:     .priv_data_size = sizeof(struct video_data),
yading@10:     .read_header    = v4l2_read_header,
yading@10:     .read_packet    = v4l2_read_packet,
yading@10:     .read_close     = v4l2_read_close,
yading@10:     .flags          = AVFMT_NOFILE,
yading@10:     .priv_class     = &v4l2_class,
yading@10: };