/*
 * V4L2 Codec decoding example application
 * Kamil Debski <k.debski@samsung.com>
 *
 * Argument parser
 *
 * Copyright 2012 - 2015 Samsung Electronics Co., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <linux/videodev2.h>
#include <sys/ioctl.h>
#include <glob.h>
#include <fcntl.h>

#include "common.h"
#include "parser.h"

#define O_RDONLY         00

void print_usage(char *name)
{
	// "d:f:i:m:c:V"
	printf("Usage:\n");
	printf("\t%s\n", name);
	printf("\t-c <codec> - The codec of the encoded stream\n");
	printf("\t\t     Available codecs: h263, h264, mpeg1, mpeg2, mpeg4, xvid\n");
	printf("\t-d <device>  - Frame buffer device (e.g. /dev/fb0)\n");
	printf("\t-f <device> - FIMC device (e.g. /dev/video4)\n");
	printf("\t-i <file> - Input file name\n");
	printf("\t-m <device> - MFC device (e.g. /dev/video8)\n");
	printf("\t-A Autodetect mode \n");
	printf("\t-D <module>:<crtc>:<conn> - DRM module (e.g. exynos:4:17)\n");
	printf("\t-B - use DMABUF instead of userptr for sharing buffers\n");
	printf("\t-V - synchronise to vsync\n");
	printf("\t-X - ignore format change by FIMC\n");
	printf("\t\n");
	printf("\tIf DRM or Frame buffer is used then FIMC should be suppplied.\n");
	printf("\tOnly one of the following Frame Buffer, DRM can be used at a time.\n");
	printf("\n");
}

static int read_file(char const *name, char *buf, int len)
{
	int fd;
	int ret;

	fd = open(name, O_RDONLY);
	if (fd < 0)
		return fd;
	ret = read(fd, buf, len);
	if (ret > 0 && ret < len)
		buf[buf[ret - 1] == '\n' ? ret - 1 : ret] = 0;
	close(fd);

	return ret >= 0 ? 0 : ret;
}

int detect_video(struct instance *i)
{
	char buf[256];
	glob_t gb;
	int ret, g, ndigits;
	static char dev_prefix[] = "/dev/video";

	ret = glob("/sys/class/video4linux/video*/name", 0, NULL, &gb);
	if (ret != 0)
		return ret;

	for (g = 0; g < gb.gl_pathc; ++g) {
		ret = read_file(gb.gl_pathv[g], buf, sizeof buf);
		if (ret != 0)
			goto finish;
		printf("Name:\t\t '%s'\n", buf);

		if (!strcmp("fimc.0.m2m", buf)) {
		i->fimc.name=(char *) malloc(100);
		strcpy(i->fimc.name, dev_prefix);
		ndigits = strlen(gb.gl_pathv[g]) - sizeof "/sys/class/video4linux/video/name" + 1;
		strncat(i->fimc.name, gb.gl_pathv[g] + sizeof "/sys/class/video4linux/video" - 1, ndigits);
		printf("Name:\t\t '%s'\n", i->fimc.name);
		}
		if (!strcmp("s5p-mfc-dec", buf)) {
		i->mfc.name=(char *) malloc(100);
		strcpy(i->mfc.name, dev_prefix);
		ndigits = strlen(gb.gl_pathv[g]) - sizeof "/sys/class/video4linux/video/name" + 1;
		strncat(i->mfc.name, gb.gl_pathv[g] + sizeof "/sys/class/video4linux/video" - 1, ndigits);
		printf("Name:\t\t '%s'\n", i->mfc.name);
		}
	}

	if (g == gb.gl_pathc) {
		ret = -1;
		goto finish;
	}

finish:
	globfree(&gb);
	return ret;


}
void init_to_defaults(struct instance *i)
{
	memset(i, 0, sizeof(*i));
}

int get_codec(char *str)
{
	if (strncasecmp("mpeg4", str, 5) == 0) {
		return V4L2_PIX_FMT_MPEG4;
	} else if (strncasecmp("h264", str, 5) == 0) {
		return V4L2_PIX_FMT_H264;
	} else if (strncasecmp("h263", str, 5) == 0) {
		return V4L2_PIX_FMT_H263;
	} else if (strncasecmp("xvid", str, 5) == 0) {
		return V4L2_PIX_FMT_XVID;
	} else if (strncasecmp("mpeg2", str, 5) == 0) {
		return V4L2_PIX_FMT_MPEG2;
	} else if (strncasecmp("mpeg1", str, 5) == 0) {
		return V4L2_PIX_FMT_MPEG1;
	}
	return 0;
}

int parse_args(struct instance *i, int argc, char **argv)
{
	char *tmp;
	int c;

	init_to_defaults(i);

	while ((c = getopt(argc, argv, "c:d:f:i:m:VXAD:B")) != -1) {
		switch (c) {
		case 'c':
			i->parser.codec = get_codec(optarg);
			break;
		case 'd':
			i->fb.name = optarg;
			i->fb.enabled = 1;
			break;
		case 'f':
			i->fimc.name = optarg;
			i->fimc.enabled = 1;
			break;
		case 'i':
			i->in.name = optarg;
			break;
		case 'm':
			i->mfc.name = optarg;
			break;
		case 'V':
			i->fimc.double_buf = 1;
			break;
		case 'X':
			i->fimc.ignore_format_change = 1;
			break;
		case 'B':
			i->fimc.dmabuf = 1;
			break;
		case 'A':
			detect_video(i);
			i->drm.autodetect = 1;
			i->drm.enabled = 1;
			i->ipp.enabled = 1;
			i->fimc.dmabuf = 1;
			break;
		case 'D':
			/* Name */
			tmp = optarg;
			while (*tmp && *tmp != ':')
				tmp++;
			if (*tmp) {
				i->drm.name = optarg;
				*tmp = 0;
				dbg("DRM module name: %s", optarg);
				optarg = ++tmp;
			} else {
				break;
			}
			/* Crtc */
			while (*tmp && *tmp != ':')
				tmp++;
			if (*tmp) {
				*tmp = 0;
				i->drm.crtc_id = atoi(optarg);
				dbg("crtc: %d (%s)", i->drm.crtc_id, optarg);
				optarg = ++tmp;
			} else {
				break;
			}
			/* Crtc */
			while (*tmp && *tmp != ':')
				tmp++;
			i->drm.conn_id = atoi(optarg);
			dbg("conn: %d (%s)", i->drm.conn_id, optarg);
			i->drm.enabled = 1;
			break;
		default:
			err("Bad argument");
			return -1;
		}
	}

	if (!i->parser.codec) {
		err("Unknown or not set codec (-c)");
		return -1;
	}
	if (!i->in.name || !i->mfc.name) {
		err("The following arguments are required: -i -m -c");
		return -1;
	}
	if (i->fimc.enabled) {
		if (i->drm.enabled) {
			dbg("Using DRM for display");
		} else if (i->fb.enabled) {
			dbg("Using FrameBuffer for display\n");
		} else {
			err("When using FIMC a framewbuffer or DRM has to be used\n");
			return -1;
		}
	}

	switch (i->parser.codec) {
	case V4L2_PIX_FMT_XVID:
	case V4L2_PIX_FMT_H263:
	case V4L2_PIX_FMT_MPEG4:
		i->parser.func = parse_mpeg4_stream;
		break;
	case V4L2_PIX_FMT_H264:
		i->parser.func = parse_h264_stream;
		break;
	case V4L2_PIX_FMT_MPEG1:
	case V4L2_PIX_FMT_MPEG2:
		i->parser.func = parse_mpeg2_stream;
		break;
	}

	return 0;
}