mirror of
https://git.videolan.org/git/ffmpeg.git
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539 lines
14 KiB
C
539 lines
14 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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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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#include "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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#define _LINUX_TIME_H 1
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#include <linux/videodev.h>
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#include <time.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_rate;
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int frame_rate_base;
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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 fmt_map {
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enum PixelFormat ff_fmt;
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int32_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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.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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.v4l2_fmt = V4L2_PIX_FMT_YUV422P,
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},
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{
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.ff_fmt = PIX_FMT_YUV422,
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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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.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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.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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.v4l2_fmt = V4L2_PIX_FMT_YUV410,
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},
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{
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.ff_fmt = PIX_FMT_BGR24,
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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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.v4l2_fmt = V4L2_PIX_FMT_RGB24,
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},
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/*
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{
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.ff_fmt = PIX_FMT_RGBA32,
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.v4l2_fmt = V4L2_PIX_FMT_BGR32,
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},
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*/
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{
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.ff_fmt = PIX_FMT_GRAY8,
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.v4l2_fmt = V4L2_PIX_FMT_GREY,
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},
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};
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static int device_open(const char *devname, 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;
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fd = open(devname, O_RDWR /*| O_NONBLOCK*/, 0);
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if (fd < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
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devname, strerror(errno));
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return -1;
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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 && errno == 515)
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{
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av_log(NULL, 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 -1;
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}
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if (res < 0) {
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av_log(NULL, 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 -1;
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}
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if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) {
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av_log(NULL, AV_LOG_ERROR, "Not a video capture device\n");
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close(fd);
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return -1;
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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(int fd, int *width, int *height, int pix_fmt)
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{
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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(NULL, 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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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)
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{
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int i;
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for (i = 0; i < sizeof(fmt_conversion_table) / sizeof(struct fmt_map); i++) {
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if (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 pix_fmt)
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{
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int i;
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for (i = 0; i < sizeof(fmt_conversion_table) / sizeof(struct fmt_map); i++) {
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if (fmt_conversion_table[i].v4l2_fmt == pix_fmt) {
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return fmt_conversion_table[i].ff_fmt;
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}
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}
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return -1;
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}
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static int mmap_init(struct video_data *s)
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{
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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(NULL, AV_LOG_ERROR, "Device does not support mmap\n");
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} else {
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av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
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}
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return -1;
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}
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if (req.count < 2) {
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av_log(NULL, AV_LOG_ERROR, "Insufficient buffer memory\n");
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return -1;
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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(NULL, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
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return -1;
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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(NULL, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
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av_free(s->buf_start);
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return -1;
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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(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
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return -1;
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}
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s->buf_len[i] = buf.length;
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if (s->buf_len[i] < s->frame_size) {
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av_log(NULL, 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(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
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return -1;
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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(struct video_data *s)
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{
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return -1;
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}
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static int mmap_read_frame(struct video_data *s, void *frame, int64_t *ts)
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{
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struct v4l2_buffer buf;
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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 &&
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((errno == EAGAIN) || (errno == EINTR)));
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if (res < 0) {
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av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", strerror(errno));
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return -1;
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}
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assert (buf.index < s->buffers);
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assert(buf.bytesused == s->frame_size);
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/* Image is at s->buff_start[buf.index] */
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memcpy(frame, s->buf_start[buf.index], buf.bytesused);
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*ts = buf.timestamp.tv_sec * int64_t_C(1000000) + buf.timestamp.tv_usec;
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res = ioctl (s->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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return -1;
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}
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return s->buf_len[buf.index];
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}
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static int read_frame(struct video_data *s, void *frame, int64_t *ts)
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{
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return -1;
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}
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static int mmap_start(struct video_data *s)
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{
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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(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
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return -1;
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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(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", strerror(errno));
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return -1;
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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)
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{
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enum v4l2_buf_type type;
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int i;
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type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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/* We do not check for the result, because we could
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* not do anything about it anyway...
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*/
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ioctl(s->fd, VIDIOC_STREAMOFF, &type);
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for (i = 0; i < s->buffers; i++) {
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munmap(s->buf_start[i], s->buf_len[i]);
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}
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av_free(s->buf_start);
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av_free(s->buf_len);
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}
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static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
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{
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struct video_data *s = s1->priv_data;
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AVStream *st;
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int width, height;
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int res, frame_rate, frame_rate_base;
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uint32_t desired_format, capabilities;
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const char *video_device;
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if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) {
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av_log(s1, AV_LOG_ERROR, "Missing/Wrong parameters\n");
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return -1;
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}
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width = ap->width;
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height = ap->height;
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frame_rate = ap->time_base.den;
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frame_rate_base = ap->time_base.num;
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if((unsigned)width > 32767 || (unsigned)height > 32767) {
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av_log(s1, AV_LOG_ERROR, "Wrong size %dx%d\n", width, height);
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return -1;
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}
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st = av_new_stream(s1, 0);
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if (!st) {
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return -ENOMEM;
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}
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av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
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s->width = width;
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s->height = height;
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s->frame_rate = frame_rate;
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s->frame_rate_base = frame_rate_base;
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video_device = ap->device;
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if (!video_device) {
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video_device = "/dev/video";
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}
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capabilities = 0;
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s->fd = device_open(video_device, &capabilities);
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if (s->fd < 0) {
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av_free(st);
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return AVERROR_IO;
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}
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av_log(s1, AV_LOG_INFO, "[%d]Capabilities: %x\n", s->fd, capabilities);
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desired_format = fmt_ff2v4l(ap->pix_fmt);
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if (desired_format == 0 || (device_init(s->fd, &width, &height, desired_format) < 0)) {
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int i, done;
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done = 0; i = 0;
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while (!done) {
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desired_format = fmt_conversion_table[i].v4l2_fmt;
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if (device_init(s->fd, &width, &height, desired_format) < 0) {
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desired_format = 0;
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i++;
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} else {
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done = 1;
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}
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if (i == sizeof(fmt_conversion_table) / sizeof(struct fmt_map)) {
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done = 1;
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}
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}
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}
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if (desired_format == 0) {
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av_log(s1, AV_LOG_ERROR, "Cannot find a proper format.\n");
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close(s->fd);
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av_free(st);
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return AVERROR_IO;
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}
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s->frame_format = desired_format;
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st->codec->pix_fmt = fmt_v4l2ff(desired_format);
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s->frame_size = avpicture_get_size(st->codec->pix_fmt, width, height);
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if (capabilities & V4L2_CAP_STREAMING) {
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s->io_method = io_mmap;
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res = mmap_init(s);
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res = mmap_start(s);
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} else {
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s->io_method = io_read;
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res = read_init(s);
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}
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if (res < 0) {
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close(s->fd);
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av_free(st);
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return AVERROR_IO;
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}
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s->top_field_first = first_field(s->fd);
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st->codec->codec_type = CODEC_TYPE_VIDEO;
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st->codec->codec_id = CODEC_ID_RAWVIDEO;
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st->codec->width = width;
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st->codec->height = height;
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st->codec->time_base.den = frame_rate;
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st->codec->time_base.num = frame_rate_base;
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st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
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return 0;
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}
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static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
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{
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struct video_data *s = s1->priv_data;
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int res;
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if (av_new_packet(pkt, s->frame_size) < 0)
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return AVERROR_IO;
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if (s->io_method == io_mmap) {
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res = mmap_read_frame(s, pkt->data, &pkt->pts);
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} else if (s->io_method == io_read) {
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res = read_frame(s, pkt->data, &pkt->pts);
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} else {
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return AVERROR_IO;
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}
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if (res < 0) {
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return AVERROR_IO;
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}
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|
|
|
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 s->frame_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;
|
|
}
|
|
|
|
static AVInputFormat v4l2_format = {
|
|
"video4linux2",
|
|
"video grab",
|
|
sizeof(struct video_data),
|
|
NULL,
|
|
v4l2_read_header,
|
|
v4l2_read_packet,
|
|
v4l2_read_close,
|
|
.flags = AVFMT_NOFILE,
|
|
};
|
|
|
|
int v4l2_init(void)
|
|
{
|
|
av_register_input_format(&v4l2_format);
|
|
return 0;
|
|
}
|