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ffmpeg / libavutil / log.c @ 4855f867

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/*
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 * log functions
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 * Copyright (c) 2003 Michel Bardiaux
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 *
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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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/**
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 * @file
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 * logging functions
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 */
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#include <unistd.h>
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#include <stdlib.h>
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#include "avutil.h"
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#include "log.h"
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#if LIBAVUTIL_VERSION_MAJOR > 50
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static
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#endif
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int av_log_level = AV_LOG_INFO;
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#ifdef _WIN32
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#include <windows.h>
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static const uint8_t color[] = {12,12,12,14,7,7,7};
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static int16_t background, attr_orig;
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static HANDLE con;
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#define set_color(x)  SetConsoleTextAttribute(con, background | color[level])
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#define reset_color() SetConsoleTextAttribute(con, attr_orig)
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#else
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static const uint8_t color[]={0x41,0x41,0x11,0x03,9,9,9};
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#define set_color(x)  fprintf(stderr, "\033[%d;3%dm", color[x]>>4, color[x]&15)
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#define reset_color() fprintf(stderr, "\033[0m")
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#endif
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static int use_color=-1;
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#undef fprintf
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static void colored_fputs(int level, const char *str){
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    if(use_color<0){
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#ifdef _WIN32
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        CONSOLE_SCREEN_BUFFER_INFO con_info;
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        con = GetStdHandle(STD_ERROR_HANDLE);
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        use_color = (con != INVALID_HANDLE_VALUE) && !getenv("NO_COLOR");
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        if (use_color) {
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            GetConsoleScreenBufferInfo(con, &con_info);
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            attr_orig  = con_info.wAttributes;
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            background = attr_orig & 0xF0;
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        }
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#elif HAVE_ISATTY
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        use_color= getenv("TERM") && !getenv("NO_COLOR") && isatty(2);
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#else
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        use_color= 0;
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#endif
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    }
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    if(use_color){
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        set_color(level);
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    }
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    fputs(str, stderr);
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    if(use_color){
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        reset_color();
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    }
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}
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const char* av_default_item_name(void* ptr){
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    return (*(AVClass**)ptr)->class_name;
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}
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void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
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{
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    static int print_prefix=1;
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    static int count;
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    static char line[1024], prev[1024];
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    AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
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    if(level>av_log_level)
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        return;
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    line[0]=0;
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#undef fprintf
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    if(print_prefix && avc) {
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        if(avc->version >= (50<<16 | 15<<8 | 3) && avc->parent_log_context_offset){
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            AVClass** parent= *(AVClass***)(((uint8_t*)ptr) + avc->parent_log_context_offset);
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            if(parent && *parent){
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                snprintf(line, sizeof(line), "[%s @ %p]", (*parent)->item_name(parent), parent);
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            }
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        }
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        snprintf(line + strlen(line), sizeof(line) - strlen(line), "[%s @ %p]", avc->item_name(ptr), ptr);
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    }
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    vsnprintf(line + strlen(line), sizeof(line) - strlen(line), fmt, vl);
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    print_prefix= line[strlen(line)-1] == '\n';
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    if(print_prefix && !strcmp(line, prev)){
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        count++;
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        return;
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    }
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    if(count>0){
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        fprintf(stderr, "    Last message repeated %d times\n", count);
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        count=0;
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    }
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    colored_fputs(av_clip(level>>3, 0, 6), line);
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    strcpy(prev, line);
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}
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static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
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void av_log(void* avcl, int level, const char *fmt, ...)
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{
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    AVClass* avc= avcl ? *(AVClass**)avcl : NULL;
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    va_list vl;
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    va_start(vl, fmt);
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    if(avc && avc->version >= (50<<16 | 15<<8 | 2) && avc->log_level_offset_offset && level>=AV_LOG_FATAL)
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        level += *(int*)(((uint8_t*)avcl) + avc->log_level_offset_offset);
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    av_vlog(avcl, level, fmt, vl);
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    va_end(vl);
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}
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void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
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{
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    av_log_callback(avcl, level, fmt, vl);
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}
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int av_log_get_level(void)
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{
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    return av_log_level;
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}
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void av_log_set_level(int level)
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{
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    av_log_level = level;
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}
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void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
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{
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    av_log_callback = callback;
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}