cmdutils.c

DawnLightPlayer,一个新的基于ffmpeg的全功能播放器

#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>

#include "avformat.h"
#include "cmdutils.h"

int av_strstart(const char *str, const char *pfx, const char **ptr)
{
	while (*pfx && *pfx == *str)
	{
		pfx++;
		str++;
	}
	if (!*pfx && ptr)
		*ptr = str;
	return !*pfx;
}

int av_stristart(const char *str, const char *pfx, const char **ptr)
{
	while (*pfx && toupper((unsigned)*pfx) == toupper((unsigned)*str))
	{
		pfx++;
		str++;
	}
	if (!*pfx && ptr)
		*ptr = str;
	return !*pfx;
}

size_t av_strlcpy(char *dst, const char *src, size_t size)
{
	size_t len = 0;
	while (++len < size && *src)
		*dst++ = *src++;
	if (len <= size)
		*dst = 0;
	return len + strlen(src) - 1;
}

size_t av_strlcat(char *dst, const char *src, size_t size)
{
	size_t len = strlen(dst);
	if (size <= len + 1)
		return len + strlen(src);
	return len + av_strlcpy(dst + len, src, size - len);
}

size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
{
	int len = strlen(dst);
	va_list vl;

	va_start(vl, fmt);
	len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
	va_end(vl);

	return len;
}

void show_help_options(const OptionDef *options, const char *msg, int mask, int value)
{
	const OptionDef *po;
	int first;

	first = 1;
	for (po = options; po->name != NULL; po++)
	{
		char buf[64];
		if ((po->flags & mask) == value)
		{
			if (first)
			{
				printf("%s", msg);
				first = 0;
			}
			av_strlcpy(buf, po->name, sizeof(buf));
			if (po->flags & HAS_ARG)
			{
				av_strlcat(buf, " ", sizeof(buf));
				av_strlcat(buf, po->argname, sizeof(buf));
			}
			printf("-%-17s  %s\n", buf, po->help);
		}
	}
}

static const OptionDef* find_option(const OptionDef *po, const char *name)
{
	while (po->name != NULL)
	{
		if (!strcmp(name, po->name))
			break;
		po++;
	}
	return po;
}

void parse_options(int argc, char **argv, const OptionDef *options,
                   void (* parse_arg_function)(const char*))
{
	const char *opt, *arg;
	int optindex, handleoptions=1;
	const OptionDef *po;

	/* parse options */
	optindex = 1;
	while (optindex < argc)
	{
		opt = argv[optindex++];

		if (handleoptions && opt[0] == '-' && opt[1] != '\0')
		{
			if (opt[1] == '-' && opt[2] == '\0')
			{
				handleoptions = 0;
				continue;
			}
			po= find_option(options, opt + 1);
			if (!po->name)
				po= find_option(options, "default");
			if (!po->name)
			{
unknown_opt:
				fprintf(stderr, "%s: unrecognized option '%s'\n", argv[0], opt);
				exit(1);
			}
			arg = NULL;
			if (po->flags & HAS_ARG)
			{
				arg = argv[optindex++];
				if (!arg)
				{
					fprintf(stderr, "%s: missing argument for option '%s'\n", argv[0], opt);
					exit(1);
				}
			}
			if (po->flags & OPT_STRING)
			{
				char *str;
				str = av_strdup(arg);
				*po->u.str_arg = str;
			}
			else if (po->flags & OPT_BOOL)
			{
				*po->u.int_arg = 1;
			}
			else if (po->flags & OPT_INT)
			{
				*po->u.int_arg = atoi(arg);
			}
			else if (po->flags & OPT_INT64)
			{
				*po->u.int64_arg = strtoll(arg, (char **)NULL, 10);
			}
			else if (po->flags & OPT_FLOAT)
			{
				*po->u.float_arg = atof(arg);
			}
			else if (po->flags & OPT_FUNC2)
			{
				if (po->u.func2_arg(opt+1, arg)<0)
					goto unknown_opt;
			}
			else
			{
				po->u.func_arg(arg);
			}
		}
		else
		{
			if (parse_arg_function)
				parse_arg_function(opt);
		}
	}
}

void print_error(const char *filename, int err)
{
	switch (err)
	{
	case AVERROR_NUMEXPECTED:
		fprintf(stderr, "%s: Incorrect image filename syntax.\n"
		        "Use '%%d' to specify the image number:\n"
		        "  for img1.jpg, img2.jpg, ..., use 'img%%d.jpg';\n"
		        "  for img001.jpg, img002.jpg, ..., use 'img%%03d.jpg'.\n",
		        filename);
		break;
	case AVERROR_INVALIDDATA:
		fprintf(stderr, "%s: Error while parsing header\n", filename);
		break;
	case AVERROR_NOFMT:
		fprintf(stderr, "%s: Unknown format\n", filename);
		break;
	case AVERROR(EIO):
					fprintf(stderr, "%s: I/O error occured\n"
					        "Usually that means that input file is truncated and/or corrupted.\n",
					        filename);
		break;
	case AVERROR(ENOMEM):
					fprintf(stderr, "%s: memory allocation error occured\n", filename);
		break;
	case AVERROR(ENOENT):
					fprintf(stderr, "%s: no such file or directory\n", filename);
		break;
	default:
		fprintf(stderr, "%s: Error while opening file\n", filename);
		break;
	}
}

void show_banner(void)
{
	printf("\033[32m");
	printf("-----------------------------------------------------------------------------\n");
	printf("  DawnLightPlayer 2008-02-27 created by kf701 and maddrone\n");
	printf("  based on FFMPEG, built on " __DATE__ " " __TIME__ "\n");
	printf("  GCC: " __VERSION__ "\n");
	printf("-----------------------------------------------------------------------------\n");
	printf("\033[39m");
	fflush(NULL);
}

void show_ui_key(void)
{
	printf("\033[33m");
	printf("-----------------------------------------------------------------------------\n");
	printf("User Interface Basic Keys:\n");
	printf(" %-17s  %s\n", "h", "show the help info");
	printf(" %-17s  %s\n", "9 and 0", "decrease and increase volume");
	printf(" %-17s  %s\n", "q or ESC", "stop playing and quit program");
	printf(" %-17s  %s\n", "p or SPACE", "pause or play movie");
	printf(" %-17s  %s\n", "<- or ->", "seek backward/forward 10 seconds");
	printf(" %-17s  %s\n", "pgdown or pgup", "seek backward/forward  1 minute");
	printf(" %-17s  %s\n", "f", "fullscreen or normal size");
	printf("-----------------------------------------------------------------------------\n");
	printf("\033[39m");
	fflush(NULL);
}