/*
 *  probe_v4l.c
 *
 *  Copyright (C) Tilmann Bitterberg - January 2004
 *
 *  This file is part of transcode, a video stream processing tool
 *
 *  transcode is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  transcode is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include "transcode.h"
#include "tcinfo.h"
#include "ioaux.h"
#include "tc.h"
#include "libtc/libtc.h"

#ifdef HAVE_V4L

#include <sys/ioctl.h>

#include "v4l/videodev.h"

#if defined(HAVE_LINUX_VIDEODEV2_H) && defined(HAVE_STRUCT_V4L2_BUFFER)
#define _LINUX_TIME_H
#include <linux/videodev2.h>
#else
#include "v4l/videodev2.h"
#endif


void probe_v4l(info_t *ipipe)
{
    int is_v4l2 = 0;
    struct v4l2_capability caps; // v4l2

    /* yes, this is a bit sick */
    close(ipipe->fd_in);
    ipipe->fd_in = open(ipipe->name, O_RDWR, 0);
    if (ipipe->fd_in < 0) {
        tc_log_error(__FILE__, "cannot (reopen) device in RW mode: %s",
                     strerror(errno));
        goto error;
    }

    /* let's start with good old defaults */
    ipipe->probe_info->width  = PAL_W;
    ipipe->probe_info->height = PAL_H;
    ipipe->probe_info->fps    = 25;
    ipipe->probe_info->frc    = 3;

    /* try a v4l2 ioctl */
    if (ipipe->verbose & TC_DEBUG)
        tc_log_msg(__FILE__, "Checking if v4l2 ioctls are supported...");
    if (ioctl(ipipe->fd_in, VIDIOC_QUERYCAP, &caps) < 0) {
        is_v4l2 = 0;
        if (ipipe->verbose & TC_DEBUG)
            tc_log_msg(__FILE__, "... no");
    } else {
        is_v4l2 = 1;
        ipipe->probe_info->magic=TC_MAGIC_V4L2_VIDEO;
        if (ipipe->verbose & TC_DEBUG)
            tc_log_msg(__FILE__, "... yes");
    }
    
    /* try v4l first */
    if (!is_v4l2) {
        struct video_capability  capability; // v4l1
        if (ipipe->verbose & TC_DEBUG)
            tc_log_msg(__FILE__, "Checking if v4l1 ioctls are supported...");
        if (-1 == ioctl(ipipe->fd_in,VIDIOCGCAP,&capability)) {
	        if (ipipe->verbose & TC_DEBUG)
	            tc_log_msg(__FILE__, "... no");
            goto error;
        } else {
	        ipipe->probe_info->magic = TC_MAGIC_V4L_VIDEO;
            if (ipipe->verbose & TC_DEBUG)
	            tc_log_msg(__FILE__, "... yes");
        }
        
        ipipe->probe_info->width  = capability.maxwidth;
        ipipe->probe_info->height = capability.maxheight;
        /* 
         * saa7134 sometimes delivers strange (for me) results.
         * In the case, PAL settings are forced until I figure out
         * if such results are correct or not.
         */
        if (ipipe->probe_info->width == 720 && ipipe->probe_info->height == 578) {
            ipipe->probe_info->height = 576;
        }
    }

    if (is_v4l2) {
        v4l2_std_id std;

        if (ioctl(ipipe->fd_in, VIDIOC_G_STD, &std) >= 0) {
            if (std & V4L2_STD_525_60) {
                ipipe->probe_info->fps = (30000/1001);
                ipipe->probe_info->frc = 4;
                ipipe->probe_info->width  = 640;
                ipipe->probe_info->height = 480;
            } else if(std & V4L2_STD_625_50) {
                ipipe->probe_info->fps = 25;
                ipipe->probe_info->frc = 3;
                ipipe->probe_info->width  = 720;
                ipipe->probe_info->height = 576;
	        }
        }
    }

    // FIXME: Check if these settings are actually supported by /dev/dsp
    ipipe->probe_info->track[0].samplerate = 44100;
    ipipe->probe_info->track[0].chan = 2;
    ipipe->probe_info->track[0].bits = 16;
    ipipe->probe_info->track[0].format = 0x1;
    if (ipipe->probe_info->track[0].chan > 0)
        ipipe->probe_info->num_tracks=1;

  return;

error:
    ipipe->error = 1;
    ipipe->probe_info->codec=TC_CODEC_UNKNOWN;
    ipipe->probe_info->magic=TC_MAGIC_UNKNOWN;

     return;
}

#else // HAVE_V4L

void probe_v4l(info_t *ipipe)
{
    tc_log_error(__FILE__, "No support for video4linux compiled in");
    ipipe->probe_info->codec=TC_CODEC_UNKNOWN;
    ipipe->probe_info->magic=TC_MAGIC_UNKNOWN;
}

#endif