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