/*

 * 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 '?';

    }

}

#if FF_API_OPT_INT_LIST

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;

}

#endif

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

}