mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-18 23:35:06 +02:00
858 lines
26 KiB
C
858 lines
26 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 AV_PIX_FMT_*
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*
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "libavformat/internal.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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#include <poll.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 <linux/videodev2.h>
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#endif
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#include "libavutil/imgutils.h"
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/avstring.h"
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#include "libavutil/mathematics.h"
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static const int desired_video_buffers = 256;
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#define V4L_ALLFORMATS 3
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#define V4L_RAWFORMATS 1
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#define V4L_COMPFORMATS 2
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struct video_data {
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AVClass *class;
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int fd;
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int frame_format; /* V4L2_PIX_FMT_* */
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int width, height;
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int frame_size;
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int timeout;
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int interlaced;
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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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char *standard;
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int channel;
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char *video_size; /**< String describing video size,
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set by a private option. */
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char *pixel_format; /**< Set by a private option. */
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int list_format; /**< Set by a private option. */
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char *framerate; /**< Set by a private option. */
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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 AVPixelFormat ff_fmt;
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enum AVCodecID 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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//ff_fmt codec_id v4l2_fmt
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{ AV_PIX_FMT_YUV420P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420 },
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{ AV_PIX_FMT_YUV422P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P },
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{ AV_PIX_FMT_YUYV422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV },
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{ AV_PIX_FMT_UYVY422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY },
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{ AV_PIX_FMT_YUV411P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P },
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{ AV_PIX_FMT_YUV410P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410 },
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{ AV_PIX_FMT_RGB555, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555 },
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{ AV_PIX_FMT_RGB565, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565 },
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{ AV_PIX_FMT_BGR24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24 },
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{ AV_PIX_FMT_RGB24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24 },
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{ AV_PIX_FMT_BGRA, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 },
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{ AV_PIX_FMT_GRAY8, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY },
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{ AV_PIX_FMT_NV12, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12 },
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{ AV_PIX_FMT_NONE, AV_CODEC_ID_MJPEG, V4L2_PIX_FMT_MJPEG },
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{ AV_PIX_FMT_NONE, AV_CODEC_ID_MJPEG, V4L2_PIX_FMT_JPEG },
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};
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static int device_open(AVFormatContext *ctx)
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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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err = errno;
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av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
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ctx->filename, strerror(err));
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return AVERROR(err);
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}
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res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
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if (res < 0) {
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err = errno;
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av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
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strerror(err));
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goto fail;
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}
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av_log(ctx, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n",
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fd, cap.capabilities);
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if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
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av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
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err = ENODEV;
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goto fail;
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}
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if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
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av_log(ctx, AV_LOG_ERROR,
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"The device does not support the streaming I/O method.\n");
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err = ENOSYS;
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goto fail;
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}
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return fd;
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fail:
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close(fd);
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return AVERROR(err);
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}
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static int device_init(AVFormatContext *ctx, int *width, int *height,
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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 = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
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struct v4l2_pix_format *pix = &fmt.fmt.pix;
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int res;
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pix->width = *width;
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pix->height = *height;
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pix->pixelformat = pix_fmt;
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pix->field = V4L2_FIELD_ANY;
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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,
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"The V4L2 driver changed the video from %dx%d to %dx%d\n",
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*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,
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"The V4L2 driver changed the pixel format "
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"from 0x%08X to 0x%08X\n",
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pix_fmt, fmt.fmt.pix.pixelformat);
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res = -1;
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}
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if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
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av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver using the interlaced mode");
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s->interlaced = 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 AVPixelFormat pix_fmt, enum AVCodecID 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 == AV_CODEC_ID_NONE ||
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fmt_conversion_table[i].codec_id == codec_id) &&
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(pix_fmt == AV_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 AVPixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum AVCodecID 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 AV_PIX_FMT_NONE;
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}
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static enum AVCodecID 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 AV_CODEC_ID_NONE;
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}
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#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
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static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat)
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{
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struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
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while(!ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
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switch (vfse.type) {
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case V4L2_FRMSIZE_TYPE_DISCRETE:
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av_log(ctx, AV_LOG_INFO, " %ux%u",
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vfse.discrete.width, vfse.discrete.height);
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break;
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case V4L2_FRMSIZE_TYPE_CONTINUOUS:
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case V4L2_FRMSIZE_TYPE_STEPWISE:
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av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
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vfse.stepwise.min_width,
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vfse.stepwise.max_width,
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vfse.stepwise.step_width,
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vfse.stepwise.min_height,
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vfse.stepwise.max_height,
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vfse.stepwise.step_height);
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}
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vfse.index++;
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}
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}
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#endif
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static void list_formats(AVFormatContext *ctx, int fd, int type)
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{
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struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
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while(!ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) {
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enum AVCodecID codec_id = fmt_v4l2codec(vfd.pixelformat);
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enum AVPixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id);
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vfd.index++;
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if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
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type & V4L_RAWFORMATS) {
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const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
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av_log(ctx, AV_LOG_INFO, "R : %9s : %20s :",
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fmt_name ? fmt_name : "Unsupported",
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vfd.description);
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} else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
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type & V4L_COMPFORMATS) {
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AVCodec *codec = avcodec_find_encoder(codec_id);
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av_log(ctx, AV_LOG_INFO, "C : %9s : %20s :",
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codec ? codec->name : "Unsupported",
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vfd.description);
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} else {
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continue;
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}
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#ifdef V4L2_FMT_FLAG_EMULATED
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if (vfd.flags & V4L2_FMT_FLAG_EMULATED) {
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av_log(ctx, AV_LOG_WARNING, "%s", "Emulated");
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continue;
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}
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#endif
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#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
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list_framesizes(ctx, fd, vfd.pixelformat);
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#endif
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av_log(ctx, AV_LOG_INFO, "\n");
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}
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}
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static int mmap_init(AVFormatContext *ctx)
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{
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int i, res;
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struct video_data *s = ctx->priv_data;
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struct v4l2_requestbuffers req = {
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.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
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.count = desired_video_buffers,
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.memory = V4L2_MEMORY_MMAP
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};
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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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.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
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.index = i,
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.memory = V4L2_MEMORY_MMAP
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};
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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,
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"Buffer len [%d] = %d != %d\n",
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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,
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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 void mmap_release_buffer(AVPacket *pkt)
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{
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struct v4l2_buffer buf = { 0 };
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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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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): %s\n",
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strerror(errno));
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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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.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
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.memory = V4L2_MEMORY_MMAP
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};
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struct buff_data *buf_descriptor;
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struct pollfd p = { .fd = s->fd, .events = POLLIN };
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int res;
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res = poll(&p, 1, s->timeout);
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if (res < 0)
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return AVERROR(errno);
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if (!(p.revents & (POLLIN | POLLERR | POLLHUP)))
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return AVERROR(EAGAIN);
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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",
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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,
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"The v4l2 frame is %d bytes, but %d bytes are expected\n",
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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] */
|
|
pkt->data= s->buf_start[buf.index];
|
|
pkt->size = buf.bytesused;
|
|
pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
|
|
pkt->destruct = mmap_release_buffer;
|
|
buf_descriptor = av_malloc(sizeof(struct buff_data));
|
|
if (buf_descriptor == NULL) {
|
|
/* Something went wrong... Since av_malloc() failed, we cannot even
|
|
* allocate a buffer for memcopying into it
|
|
*/
|
|
av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
|
|
res = ioctl(s->fd, VIDIOC_QBUF, &buf);
|
|
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
buf_descriptor->fd = s->fd;
|
|
buf_descriptor->index = buf.index;
|
|
pkt->priv = buf_descriptor;
|
|
|
|
return s->buf_len[buf.index];
|
|
}
|
|
|
|
static int mmap_start(AVFormatContext *ctx)
|
|
{
|
|
struct video_data *s = ctx->priv_data;
|
|
enum v4l2_buf_type type;
|
|
int i, res;
|
|
|
|
for (i = 0; i < s->buffers; i++) {
|
|
struct v4l2_buffer buf = {
|
|
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
|
|
.index = i,
|
|
.memory = V4L2_MEMORY_MMAP
|
|
};
|
|
|
|
res = ioctl(s->fd, VIDIOC_QBUF, &buf);
|
|
if (res < 0) {
|
|
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
|
|
strerror(errno));
|
|
|
|
return AVERROR(errno);
|
|
}
|
|
}
|
|
|
|
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
|
res = ioctl(s->fd, VIDIOC_STREAMON, &type);
|
|
if (res < 0) {
|
|
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
|
|
strerror(errno));
|
|
|
|
return AVERROR(errno);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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)
|
|
{
|
|
struct video_data *s = s1->priv_data;
|
|
struct v4l2_input input = { 0 };
|
|
struct v4l2_standard standard = { 0 };
|
|
struct v4l2_streamparm streamparm = { 0 };
|
|
struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe;
|
|
AVRational framerate_q = { 0 };
|
|
int i, ret;
|
|
|
|
streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
|
|
|
if (s->framerate &&
|
|
(ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
|
|
av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
|
|
s->framerate);
|
|
return ret;
|
|
}
|
|
|
|
/* set tv video input */
|
|
input.index = s->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",
|
|
s->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",
|
|
s->channel);
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
if (s->standard) {
|
|
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
|
|
s->standard);
|
|
/* set tv 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",
|
|
s->standard);
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
if (!av_strcasecmp(standard.name, s->standard)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
av_log(s1, AV_LOG_DEBUG,
|
|
"The V4L2 driver set standard: %s, id: %"PRIu64"\n",
|
|
s->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",
|
|
s->standard);
|
|
return AVERROR(EIO);
|
|
}
|
|
}
|
|
|
|
if (framerate_q.num && framerate_q.den) {
|
|
av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
|
|
framerate_q.den, framerate_q.num);
|
|
tpf->numerator = framerate_q.den;
|
|
tpf->denominator = framerate_q.num;
|
|
|
|
if (ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
|
|
av_log(s1, AV_LOG_ERROR,
|
|
"ioctl set time per frame(%d/%d) failed\n",
|
|
framerate_q.den, framerate_q.num);
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
if (framerate_q.num != tpf->denominator ||
|
|
framerate_q.den != tpf->numerator) {
|
|
av_log(s1, AV_LOG_INFO,
|
|
"The driver changed the time per frame from "
|
|
"%d/%d to %d/%d\n",
|
|
framerate_q.den, framerate_q.num,
|
|
tpf->numerator, tpf->denominator);
|
|
}
|
|
} else {
|
|
if (ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
|
|
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n",
|
|
strerror(errno));
|
|
return AVERROR(errno);
|
|
}
|
|
}
|
|
s1->streams[0]->codec->time_base.den = tpf->denominator;
|
|
s1->streams[0]->codec->time_base.num = tpf->numerator;
|
|
|
|
s->timeout = 100 +
|
|
av_rescale_q(1, s1->streams[0]->codec->time_base,
|
|
(AVRational){1, 1000});
|
|
|
|
return 0;
|
|
}
|
|
|
|
static uint32_t device_try_init(AVFormatContext *s1,
|
|
enum AVPixelFormat pix_fmt,
|
|
int *width,
|
|
int *height,
|
|
enum AVCodecID *codec_id)
|
|
{
|
|
uint32_t desired_format = fmt_ff2v4l(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 == AV_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 != AV_CODEC_ID_NONE);
|
|
}
|
|
|
|
return desired_format;
|
|
}
|
|
|
|
static int v4l2_read_header(AVFormatContext *s1)
|
|
{
|
|
struct video_data *s = s1->priv_data;
|
|
AVStream *st;
|
|
int res = 0;
|
|
uint32_t desired_format;
|
|
enum AVCodecID codec_id;
|
|
enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
|
|
|
|
st = avformat_new_stream(s1, NULL);
|
|
if (!st) {
|
|
res = AVERROR(ENOMEM);
|
|
goto out;
|
|
}
|
|
|
|
s->fd = device_open(s1);
|
|
if (s->fd < 0) {
|
|
res = s->fd;
|
|
goto out;
|
|
}
|
|
|
|
if (s->list_format) {
|
|
list_formats(s1, s->fd, s->list_format);
|
|
res = AVERROR_EXIT;
|
|
goto out;
|
|
}
|
|
|
|
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
|
|
|
|
if (s->video_size &&
|
|
(res = av_parse_video_size(&s->width, &s->height, s->video_size)) < 0) {
|
|
av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n",
|
|
s->video_size);
|
|
goto out;
|
|
}
|
|
|
|
if (s->pixel_format) {
|
|
AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format);
|
|
|
|
if (codec)
|
|
s1->video_codec_id = codec->id;
|
|
|
|
pix_fmt = av_get_pix_fmt(s->pixel_format);
|
|
|
|
if (pix_fmt == AV_PIX_FMT_NONE && !codec) {
|
|
av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n",
|
|
s->pixel_format);
|
|
|
|
res = AVERROR(EINVAL);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
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));
|
|
res = AVERROR(errno);
|
|
goto out;
|
|
}
|
|
|
|
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, pix_fmt, &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, pix_fmt);
|
|
close(s->fd);
|
|
|
|
res = AVERROR(EIO);
|
|
goto out;
|
|
}
|
|
|
|
if ((res = av_image_check_size(s->width, s->height, 0, s1) < 0))
|
|
goto out;
|
|
|
|
s->frame_format = desired_format;
|
|
|
|
if ((res = v4l2_set_parameters(s1) < 0))
|
|
goto out;
|
|
|
|
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 ((res = mmap_init(s1)) ||
|
|
(res = mmap_start(s1)) < 0) {
|
|
close(s->fd);
|
|
goto out;
|
|
}
|
|
|
|
s->top_field_first = first_field(s->fd);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = codec_id;
|
|
if (codec_id == AV_CODEC_ID_RAWVIDEO)
|
|
st->codec->codec_tag =
|
|
avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
|
|
st->codec->width = s->width;
|
|
st->codec->height = s->height;
|
|
st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
|
|
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
|
|
{
|
|
struct video_data *s = s1->priv_data;
|
|
AVFrame *frame = s1->streams[0]->codec->coded_frame;
|
|
int res;
|
|
|
|
av_init_packet(pkt);
|
|
if ((res = mmap_read_frame(s1, pkt)) < 0) {
|
|
return res;
|
|
}
|
|
|
|
if (frame && s->interlaced) {
|
|
frame->interlaced_frame = 1;
|
|
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;
|
|
|
|
mmap_close(s);
|
|
|
|
close(s->fd);
|
|
return 0;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(struct video_data, x)
|
|
#define DEC AV_OPT_FLAG_DECODING_PARAM
|
|
static const AVOption options[] = {
|
|
{ "standard", "TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
|
|
{ "channel", "TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
|
|
{ "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
|
|
{ "pixel_format", "Preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
|
|
{ "input_format", "Preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
|
|
{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
|
|
{ "list_formats", "List available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC, "list_formats" },
|
|
{ "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
|
|
{ "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
|
|
{ "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass v4l2_class = {
|
|
.class_name = "V4L2 indev",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVInputFormat ff_v4l2_demuxer = {
|
|
.name = "video4linux2",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
|
|
.priv_data_size = sizeof(struct video_data),
|
|
.read_header = v4l2_read_header,
|
|
.read_packet = v4l2_read_packet,
|
|
.read_close = v4l2_read_close,
|
|
.flags = AVFMT_NOFILE,
|
|
.priv_class = &v4l2_class,
|
|
};
|