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151 lines
4.5 KiB
151 lines
4.5 KiB
/*
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* probe_v4l.c
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*
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* Copyright (C) Tilmann Bitterberg - January 2004
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*
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* This file is part of transcode, a video stream processing tool
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*
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* transcode is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* transcode 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include "transcode.h"
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#include "tcinfo.h"
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#include "ioaux.h"
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#include "tc.h"
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#include "libtc/libtc.h"
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#ifdef HAVE_V4L
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#include <sys/ioctl.h>
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#include "v4l/videodev.h"
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#if defined(HAVE_LINUX_VIDEODEV2_H) && defined(HAVE_STRUCT_V4L2_BUFFER)
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#define _LINUX_TIME_H
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#include <linux/videodev2.h>
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#else
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#include "v4l/videodev2.h"
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#endif
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void probe_v4l(info_t *ipipe)
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{
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int is_v4l2 = 0;
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struct v4l2_capability caps; // v4l2
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/* yes, this is a bit sick */
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close(ipipe->fd_in);
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ipipe->fd_in = open(ipipe->name, O_RDWR, 0);
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if (ipipe->fd_in < 0) {
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tc_log_error(__FILE__, "cannot (reopen) device in RW mode: %s",
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strerror(errno));
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goto error;
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}
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/* let's start with good old defaults */
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ipipe->probe_info->width = PAL_W;
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ipipe->probe_info->height = PAL_H;
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ipipe->probe_info->fps = 25;
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ipipe->probe_info->frc = 3;
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/* try a v4l2 ioctl */
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if (ipipe->verbose & TC_DEBUG)
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tc_log_msg(__FILE__, "Checking if v4l2 ioctls are supported...");
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if (ioctl(ipipe->fd_in, VIDIOC_QUERYCAP, &caps) < 0) {
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is_v4l2 = 0;
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if (ipipe->verbose & TC_DEBUG)
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tc_log_msg(__FILE__, "... no");
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} else {
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is_v4l2 = 1;
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ipipe->probe_info->magic=TC_MAGIC_V4L2_VIDEO;
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if (ipipe->verbose & TC_DEBUG)
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tc_log_msg(__FILE__, "... yes");
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}
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/* try v4l first */
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if (!is_v4l2) {
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struct video_capability capability; // v4l1
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if (ipipe->verbose & TC_DEBUG)
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tc_log_msg(__FILE__, "Checking if v4l1 ioctls are supported...");
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if (-1 == ioctl(ipipe->fd_in,VIDIOCGCAP,&capability)) {
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if (ipipe->verbose & TC_DEBUG)
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tc_log_msg(__FILE__, "... no");
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goto error;
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} else {
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ipipe->probe_info->magic = TC_MAGIC_V4L_VIDEO;
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if (ipipe->verbose & TC_DEBUG)
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tc_log_msg(__FILE__, "... yes");
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}
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ipipe->probe_info->width = capability.maxwidth;
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ipipe->probe_info->height = capability.maxheight;
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/*
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* saa7134 sometimes delivers strange (for me) results.
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* In the case, PAL settings are forced until I figure out
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* if such results are correct or not.
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*/
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if (ipipe->probe_info->width == 720 && ipipe->probe_info->height == 578) {
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ipipe->probe_info->height = 576;
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}
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}
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if (is_v4l2) {
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v4l2_std_id std;
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if (ioctl(ipipe->fd_in, VIDIOC_G_STD, &std) >= 0) {
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if (std & V4L2_STD_525_60) {
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ipipe->probe_info->fps = (30000/1001);
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ipipe->probe_info->frc = 4;
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ipipe->probe_info->width = 640;
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ipipe->probe_info->height = 480;
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} else if(std & V4L2_STD_625_50) {
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ipipe->probe_info->fps = 25;
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ipipe->probe_info->frc = 3;
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ipipe->probe_info->width = 720;
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ipipe->probe_info->height = 576;
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}
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}
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}
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// FIXME: Check if these settings are actually supported by /dev/dsp
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ipipe->probe_info->track[0].samplerate = 44100;
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ipipe->probe_info->track[0].chan = 2;
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ipipe->probe_info->track[0].bits = 16;
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ipipe->probe_info->track[0].format = 0x1;
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if (ipipe->probe_info->track[0].chan > 0)
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ipipe->probe_info->num_tracks=1;
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return;
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error:
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ipipe->error = 1;
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ipipe->probe_info->codec=TC_CODEC_UNKNOWN;
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ipipe->probe_info->magic=TC_MAGIC_UNKNOWN;
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return;
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}
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#else // HAVE_V4L
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void probe_v4l(info_t *ipipe)
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{
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tc_log_error(__FILE__, "No support for video4linux compiled in");
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ipipe->probe_info->codec=TC_CODEC_UNKNOWN;
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ipipe->probe_info->magic=TC_MAGIC_UNKNOWN;
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}
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#endif
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