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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "avutil.h"
#include "avassert.h"
/**
* @file
* various utility functions
*/
const char *av_get_media_type_string(enum AVMediaType media_type)
{
switch (media_type) {
case AVMEDIA_TYPE_VIDEO: return "video";
case AVMEDIA_TYPE_AUDIO: return "audio";
case AVMEDIA_TYPE_DATA: return "data";
case AVMEDIA_TYPE_SUBTITLE: return "subtitle";
case AVMEDIA_TYPE_ATTACHMENT: return "attachment";
default: return NULL;
}
}
char av_get_picture_type_char(enum AVPictureType pict_type)
{
switch (pict_type) {
case AV_PICTURE_TYPE_I: return 'I';
case AV_PICTURE_TYPE_P: return 'P';
case AV_PICTURE_TYPE_B: return 'B';
case AV_PICTURE_TYPE_S: return 'S';
case AV_PICTURE_TYPE_SI: return 'i';
case AV_PICTURE_TYPE_SP: return 'p';
case AV_PICTURE_TYPE_BI: return 'b';
default: return '?';
}
}
unsigned av_int_list_length_for_size(unsigned elsize,
const void *list, uint64_t term)
{
unsigned i;
if (!list)
return 0;
#define LIST_LENGTH(type) \
{ type t = term, *l = (type *)list; for (i = 0; l[i] != t; i++); }
switch (elsize) {
case 1: LIST_LENGTH(uint8_t); break;
case 2: LIST_LENGTH(uint16_t); break;
case 4: LIST_LENGTH(uint32_t); break;
case 8: LIST_LENGTH(uint64_t); break;
default: av_assert0(!"valid element size");
}
return i;
}
char *av_fourcc_make_string(char *buf, uint32_t fourcc)
{
int i;
char *orig_buf = buf;
size_t buf_size = AV_FOURCC_MAX_STRING_SIZE;
for (i = 0; i < 4; i++) {
const int c = fourcc & 0xff;
const int print_chr = (c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
(c && strchr(". -_", c));
const int len = snprintf(buf, buf_size, print_chr ? "%c" : "[%d]", c);
if (len < 0)
break;
buf += len;
buf_size = buf_size > len ? buf_size - len : 0;
fourcc >>= 8;
}
return orig_buf;
}
AVRational av_get_time_base_q(void)
{
return (AVRational){1, AV_TIME_BASE};
}
void av_assert0_fpu(void) {
#if HAVE_MMX_INLINE
uint16_t state[14];
__asm__ volatile (
"fstenv %0 \n\t"
: "+m" (state)
:
: "memory"
);
av_assert0((state[4] & 3) == 3);
#endif
}
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