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![Pete Eberlein](/assets/img/avatar_default.png)
video4linux2 devices. This is used by Sensoray Model 2253 cards. Patch by Pete Eberlein (pete AT sensoray DOT com) Originally committed as revision 24759 to svn://svn.ffmpeg.org/ffmpeg/trunk
719 lines
20 KiB
C
719 lines
20 KiB
C
/*
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* Video4Linux2 grab interface
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* Copyright (c) 2000,2001 Fabrice Bellard
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* Copyright (c) 2006 Luca Abeni
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*
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* Part of this file is based on the V4L2 video capture example
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* (http://v4l2spec.bytesex.org/v4l2spec/capture.c)
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*
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* Thanks to Michael Niedermayer for providing the mapping between
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* V4L2_PIX_FMT_* and PIX_FMT_*
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*
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#undef __STRICT_ANSI__ //workaround due to broken kernel headers
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#include "config.h"
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#include "libavformat/avformat.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#if HAVE_SYS_VIDEOIO_H
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#include <sys/videoio.h>
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#else
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#include <asm/types.h>
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#include <linux/videodev2.h>
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#endif
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#include <time.h>
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#include <strings.h>
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#include "libavcore/imgutils.h"
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static const int desired_video_buffers = 256;
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enum io_method {
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io_read,
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io_mmap,
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io_userptr
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};
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struct video_data {
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int fd;
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int frame_format; /* V4L2_PIX_FMT_* */
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enum io_method io_method;
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int width, height;
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int frame_size;
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int top_field_first;
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int buffers;
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void **buf_start;
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unsigned int *buf_len;
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};
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struct buff_data {
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int index;
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int fd;
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};
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struct fmt_map {
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enum PixelFormat ff_fmt;
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enum CodecID codec_id;
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uint32_t v4l2_fmt;
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};
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static struct fmt_map fmt_conversion_table[] = {
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{
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.ff_fmt = PIX_FMT_YUV420P,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_YUV420,
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},
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{
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.ff_fmt = PIX_FMT_YUV422P,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_YUV422P,
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},
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{
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.ff_fmt = PIX_FMT_YUYV422,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_YUYV,
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},
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{
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.ff_fmt = PIX_FMT_UYVY422,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_UYVY,
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},
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{
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.ff_fmt = PIX_FMT_YUV411P,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_YUV411P,
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},
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{
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.ff_fmt = PIX_FMT_YUV410P,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_YUV410,
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},
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{
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.ff_fmt = PIX_FMT_RGB555,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_RGB555,
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},
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{
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.ff_fmt = PIX_FMT_RGB565,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_RGB565,
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},
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{
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.ff_fmt = PIX_FMT_BGR24,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_BGR24,
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},
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{
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.ff_fmt = PIX_FMT_RGB24,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_RGB24,
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},
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{
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.ff_fmt = PIX_FMT_BGRA,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_BGR32,
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},
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{
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.ff_fmt = PIX_FMT_GRAY8,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_GREY,
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},
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{
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.ff_fmt = PIX_FMT_NV12,
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.codec_id = CODEC_ID_RAWVIDEO,
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.v4l2_fmt = V4L2_PIX_FMT_NV12,
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},
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{
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.ff_fmt = PIX_FMT_NONE,
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.codec_id = CODEC_ID_MJPEG,
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.v4l2_fmt = V4L2_PIX_FMT_MJPEG,
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},
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{
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.ff_fmt = PIX_FMT_NONE,
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.codec_id = CODEC_ID_MJPEG,
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.v4l2_fmt = V4L2_PIX_FMT_JPEG,
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},
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};
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static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
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{
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struct v4l2_capability cap;
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int fd;
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int res, err;
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int flags = O_RDWR;
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if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
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flags |= O_NONBLOCK;
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}
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fd = open(ctx->filename, flags, 0);
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if (fd < 0) {
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av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
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ctx->filename, strerror(errno));
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return AVERROR(errno);
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}
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res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
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// ENOIOCTLCMD definition only availble on __KERNEL__
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if (res < 0 && ((err = errno) == 515)) {
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av_log(ctx, AV_LOG_ERROR, "QUERYCAP not implemented, probably V4L device but not supporting V4L2\n");
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close(fd);
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return AVERROR(515);
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}
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if (res < 0) {
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av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
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strerror(errno));
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close(fd);
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return AVERROR(err);
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}
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if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) {
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av_log(ctx, AV_LOG_ERROR, "Not a video capture device\n");
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close(fd);
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return AVERROR(ENODEV);
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}
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*capabilities = cap.capabilities;
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return fd;
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}
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static int device_init(AVFormatContext *ctx, int *width, int *height, uint32_t pix_fmt)
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{
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struct video_data *s = ctx->priv_data;
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int fd = s->fd;
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struct v4l2_format fmt;
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int res;
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memset(&fmt, 0, sizeof(struct v4l2_format));
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fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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fmt.fmt.pix.width = *width;
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fmt.fmt.pix.height = *height;
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fmt.fmt.pix.pixelformat = pix_fmt;
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fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
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res = ioctl(fd, VIDIOC_S_FMT, &fmt);
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if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
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av_log(ctx, AV_LOG_INFO, "The V4L2 driver changed the video from %dx%d to %dx%d\n", *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
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*width = fmt.fmt.pix.width;
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*height = fmt.fmt.pix.height;
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}
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if (pix_fmt != fmt.fmt.pix.pixelformat) {
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av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver changed the pixel format from 0x%08X to 0x%08X\n", pix_fmt, fmt.fmt.pix.pixelformat);
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res = -1;
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}
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return res;
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}
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static int first_field(int fd)
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{
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int res;
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v4l2_std_id std;
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res = ioctl(fd, VIDIOC_G_STD, &std);
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if (res < 0) {
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return 0;
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}
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if (std & V4L2_STD_NTSC) {
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return 0;
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}
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return 1;
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}
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static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt, enum CodecID codec_id)
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{
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
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if ((codec_id == CODEC_ID_NONE ||
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fmt_conversion_table[i].codec_id == codec_id) &&
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(pix_fmt == PIX_FMT_NONE ||
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fmt_conversion_table[i].ff_fmt == pix_fmt)) {
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return fmt_conversion_table[i].v4l2_fmt;
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}
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}
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return 0;
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}
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static enum PixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum CodecID codec_id)
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{
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
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if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt &&
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fmt_conversion_table[i].codec_id == codec_id) {
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return fmt_conversion_table[i].ff_fmt;
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}
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}
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return PIX_FMT_NONE;
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}
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static enum CodecID fmt_v4l2codec(uint32_t v4l2_fmt)
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{
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
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if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt) {
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return fmt_conversion_table[i].codec_id;
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}
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}
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return CODEC_ID_NONE;
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}
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static int mmap_init(AVFormatContext *ctx)
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{
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struct video_data *s = ctx->priv_data;
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struct v4l2_requestbuffers req;
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int i, res;
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memset(&req, 0, sizeof(struct v4l2_requestbuffers));
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req.count = desired_video_buffers;
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req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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req.memory = V4L2_MEMORY_MMAP;
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res = ioctl (s->fd, VIDIOC_REQBUFS, &req);
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if (res < 0) {
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if (errno == EINVAL) {
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av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n");
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} else {
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av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
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}
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return AVERROR(errno);
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}
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if (req.count < 2) {
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av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
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return AVERROR(ENOMEM);
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}
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s->buffers = req.count;
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s->buf_start = av_malloc(sizeof(void *) * s->buffers);
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if (s->buf_start == NULL) {
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av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
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return AVERROR(ENOMEM);
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}
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s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
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if (s->buf_len == NULL) {
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av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
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av_free(s->buf_start);
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return AVERROR(ENOMEM);
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}
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for (i = 0; i < req.count; i++) {
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struct v4l2_buffer buf;
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memset(&buf, 0, sizeof(struct v4l2_buffer));
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buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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buf.index = i;
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res = ioctl (s->fd, VIDIOC_QUERYBUF, &buf);
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if (res < 0) {
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av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
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return AVERROR(errno);
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}
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s->buf_len[i] = buf.length;
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if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
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av_log(ctx, AV_LOG_ERROR, "Buffer len [%d] = %d != %d\n", i, s->buf_len[i], s->frame_size);
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return -1;
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}
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s->buf_start[i] = mmap (NULL, buf.length,
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PROT_READ | PROT_WRITE, MAP_SHARED, s->fd, buf.m.offset);
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if (s->buf_start[i] == MAP_FAILED) {
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av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
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return AVERROR(errno);
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}
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}
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return 0;
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}
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static int read_init(AVFormatContext *ctx)
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{
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return -1;
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}
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static void mmap_release_buffer(AVPacket *pkt)
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{
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struct v4l2_buffer buf;
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int res, fd;
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struct buff_data *buf_descriptor = pkt->priv;
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if (pkt->data == NULL) {
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return;
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}
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memset(&buf, 0, sizeof(struct v4l2_buffer));
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buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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buf.index = buf_descriptor->index;
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fd = buf_descriptor->fd;
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av_free(buf_descriptor);
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res = ioctl (fd, VIDIOC_QBUF, &buf);
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if (res < 0) {
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av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
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}
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pkt->data = NULL;
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pkt->size = 0;
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}
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static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
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{
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struct video_data *s = ctx->priv_data;
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struct v4l2_buffer buf;
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struct buff_data *buf_descriptor;
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int res;
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memset(&buf, 0, sizeof(struct v4l2_buffer));
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buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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/* FIXME: Some special treatment might be needed in case of loss of signal... */
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while ((res = ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
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if (res < 0) {
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if (errno == EAGAIN) {
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pkt->size = 0;
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return AVERROR(EAGAIN);
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}
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av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", strerror(errno));
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return AVERROR(errno);
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}
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assert (buf.index < s->buffers);
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if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
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av_log(ctx, AV_LOG_ERROR, "The v4l2 frame is %d bytes, but %d bytes are expected\n", buf.bytesused, s->frame_size);
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return AVERROR_INVALIDDATA;
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}
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/* Image is at s->buff_start[buf.index] */
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pkt->data= s->buf_start[buf.index];
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pkt->size = buf.bytesused;
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pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
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pkt->destruct = mmap_release_buffer;
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buf_descriptor = av_malloc(sizeof(struct buff_data));
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if (buf_descriptor == NULL) {
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/* Something went wrong... Since av_malloc() failed, we cannot even
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* allocate a buffer for memcopying into it
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*/
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av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
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res = ioctl (s->fd, VIDIOC_QBUF, &buf);
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return AVERROR(ENOMEM);
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}
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buf_descriptor->fd = s->fd;
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buf_descriptor->index = buf.index;
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pkt->priv = buf_descriptor;
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return s->buf_len[buf.index];
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}
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|
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static int read_frame(AVFormatContext *ctx, AVPacket *pkt)
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|
{
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|
return -1;
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|
}
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|
|
|
static int mmap_start(AVFormatContext *ctx)
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|
{
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struct video_data *s = ctx->priv_data;
|
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enum v4l2_buf_type type;
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int i, res;
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for (i = 0; i < s->buffers; i++) {
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struct v4l2_buffer buf;
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memset(&buf, 0, sizeof(struct v4l2_buffer));
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buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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buf.index = i;
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res = ioctl (s->fd, VIDIOC_QBUF, &buf);
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if (res < 0) {
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av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
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return AVERROR(errno);
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}
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}
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type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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res = ioctl (s->fd, VIDIOC_STREAMON, &type);
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if (res < 0) {
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av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", strerror(errno));
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|
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return AVERROR(errno);
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}
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|
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return 0;
|
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}
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|
|
static void mmap_close(struct video_data *s)
|
|
{
|
|
enum v4l2_buf_type type;
|
|
int i;
|
|
|
|
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
|
/* We do not check for the result, because we could
|
|
* not do anything about it anyway...
|
|
*/
|
|
ioctl(s->fd, VIDIOC_STREAMOFF, &type);
|
|
for (i = 0; i < s->buffers; i++) {
|
|
munmap(s->buf_start[i], s->buf_len[i]);
|
|
}
|
|
av_free(s->buf_start);
|
|
av_free(s->buf_len);
|
|
}
|
|
|
|
static int v4l2_set_parameters( AVFormatContext *s1, AVFormatParameters *ap )
|
|
{
|
|
struct video_data *s = s1->priv_data;
|
|
struct v4l2_input input;
|
|
struct v4l2_standard standard;
|
|
int i;
|
|
|
|
if(ap->channel>=0) {
|
|
/* set tv video input */
|
|
memset (&input, 0, sizeof (input));
|
|
input.index = ap->channel;
|
|
if(ioctl (s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
|
|
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n",
|
|
ap->channel, input.name);
|
|
if(ioctl (s->fd, VIDIOC_S_INPUT, &input.index) < 0 ) {
|
|
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set input(%d) failed\n",
|
|
ap->channel);
|
|
return AVERROR(EIO);
|
|
}
|
|
}
|
|
|
|
if(ap->standard) {
|
|
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
|
|
ap->standard );
|
|
/* set tv standard */
|
|
memset (&standard, 0, sizeof (standard));
|
|
for(i=0;;i++) {
|
|
standard.index = i;
|
|
if (ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
|
|
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
|
|
ap->standard);
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
if(!strcasecmp(standard.name, ap->standard)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
|
|
ap->standard, (uint64_t)standard.id);
|
|
if (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
|
|
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
|
|
ap->standard);
|
|
return AVERROR(EIO);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static uint32_t device_try_init(AVFormatContext *s1,
|
|
const AVFormatParameters *ap,
|
|
int *width,
|
|
int *height,
|
|
enum CodecID *codec_id)
|
|
{
|
|
uint32_t desired_format = fmt_ff2v4l(ap->pix_fmt, s1->video_codec_id);
|
|
|
|
if (desired_format == 0 ||
|
|
device_init(s1, width, height, desired_format) < 0) {
|
|
int i;
|
|
|
|
desired_format = 0;
|
|
for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
|
|
if (s1->video_codec_id == CODEC_ID_NONE ||
|
|
fmt_conversion_table[i].codec_id == s1->video_codec_id) {
|
|
desired_format = fmt_conversion_table[i].v4l2_fmt;
|
|
if (device_init(s1, width, height, desired_format) >= 0) {
|
|
break;
|
|
}
|
|
desired_format = 0;
|
|
}
|
|
}
|
|
}
|
|
if (desired_format != 0) {
|
|
*codec_id = fmt_v4l2codec(desired_format);
|
|
assert(*codec_id != CODEC_ID_NONE);
|
|
}
|
|
|
|
return desired_format;
|
|
}
|
|
|
|
static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
|
|
{
|
|
struct video_data *s = s1->priv_data;
|
|
AVStream *st;
|
|
int res;
|
|
uint32_t desired_format, capabilities;
|
|
enum CodecID codec_id;
|
|
|
|
st = av_new_stream(s1, 0);
|
|
if (!st) {
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
|
|
|
|
s->width = ap->width;
|
|
s->height = ap->height;
|
|
|
|
capabilities = 0;
|
|
s->fd = device_open(s1, &capabilities);
|
|
if (s->fd < 0) {
|
|
return AVERROR(EIO);
|
|
}
|
|
av_log(s1, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n", s->fd, capabilities);
|
|
|
|
if (!s->width && !s->height) {
|
|
struct v4l2_format fmt;
|
|
|
|
av_log(s1, AV_LOG_VERBOSE, "Querying the device for the current frame size\n");
|
|
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
|
if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
|
|
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", strerror(errno));
|
|
return AVERROR(errno);
|
|
}
|
|
s->width = fmt.fmt.pix.width;
|
|
s->height = fmt.fmt.pix.height;
|
|
av_log(s1, AV_LOG_VERBOSE, "Setting frame size to %dx%d\n", s->width, s->height);
|
|
}
|
|
|
|
desired_format = device_try_init(s1, ap, &s->width, &s->height, &codec_id);
|
|
if (desired_format == 0) {
|
|
av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
|
|
"codec_id %d, pix_fmt %d.\n", s1->video_codec_id, ap->pix_fmt);
|
|
close(s->fd);
|
|
|
|
return AVERROR(EIO);
|
|
}
|
|
if (av_check_image_size(s->width, s->height, 0, s1) < 0)
|
|
return AVERROR(EINVAL);
|
|
s->frame_format = desired_format;
|
|
|
|
if( v4l2_set_parameters( s1, ap ) < 0 )
|
|
return AVERROR(EIO);
|
|
|
|
st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
|
|
s->frame_size = avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
|
|
if (capabilities & V4L2_CAP_STREAMING) {
|
|
s->io_method = io_mmap;
|
|
res = mmap_init(s1);
|
|
if (res == 0) {
|
|
res = mmap_start(s1);
|
|
}
|
|
} else {
|
|
s->io_method = io_read;
|
|
res = read_init(s1);
|
|
}
|
|
if (res < 0) {
|
|
close(s->fd);
|
|
|
|
return AVERROR(EIO);
|
|
}
|
|
s->top_field_first = first_field(s->fd);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = codec_id;
|
|
st->codec->width = s->width;
|
|
st->codec->height = s->height;
|
|
st->codec->time_base.den = ap->time_base.den;
|
|
st->codec->time_base.num = ap->time_base.num;
|
|
st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
|
|
{
|
|
struct video_data *s = s1->priv_data;
|
|
int res;
|
|
|
|
if (s->io_method == io_mmap) {
|
|
av_init_packet(pkt);
|
|
res = mmap_read_frame(s1, pkt);
|
|
} else if (s->io_method == io_read) {
|
|
if (av_new_packet(pkt, s->frame_size) < 0)
|
|
return AVERROR(EIO);
|
|
|
|
res = read_frame(s1, pkt);
|
|
} else {
|
|
return AVERROR(EIO);
|
|
}
|
|
if (res < 0) {
|
|
return res;
|
|
}
|
|
|
|
if (s1->streams[0]->codec->coded_frame) {
|
|
s1->streams[0]->codec->coded_frame->interlaced_frame = 1;
|
|
s1->streams[0]->codec->coded_frame->top_field_first = s->top_field_first;
|
|
}
|
|
|
|
return pkt->size;
|
|
}
|
|
|
|
static int v4l2_read_close(AVFormatContext *s1)
|
|
{
|
|
struct video_data *s = s1->priv_data;
|
|
|
|
if (s->io_method == io_mmap) {
|
|
mmap_close(s);
|
|
}
|
|
|
|
close(s->fd);
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat v4l2_demuxer = {
|
|
"video4linux2",
|
|
NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
|
|
sizeof(struct video_data),
|
|
NULL,
|
|
v4l2_read_header,
|
|
v4l2_read_packet,
|
|
v4l2_read_close,
|
|
.flags = AVFMT_NOFILE,
|
|
};
|