[FFmpeg-devel] [PATCH v4 3/4] fftools: Provide a an fftools-specific logging callback function

[softworkz <ffmpegagent@gmail.com>]

From: softworkz <softworkz@hotmail.com>

This goes together with a change to logging of context prefixes, which
is printing logical ids instead of memory addresses.
The benefits are:

- Smaller log file sizes
- The disambiguation is much easier to recognize and to follow
- It eventually allows comparing and viewing log file diffs
  without almost every line being different due to those addresses
---
 fftools/Makefile        |   7 +-
 fftools/ffmpeg.c        |   2 +
 fftools/ffmpeg_filter.c |   2 +-
 fftools/ffplay.c        |   2 +
 fftools/ffprobe.c       |   2 +
 fftools/fftools_log.c   | 480 ++++++++++++++++++++++++++++++++++++++++
 fftools/fftools_log.h   |  44 ++++
 7 files changed, 537 insertions(+), 2 deletions(-)
 create mode 100644 fftools/fftools_log.c
 create mode 100644 fftools/fftools_log.h

diff --git a/fftools/Makefile b/fftools/Makefile
index 4499799818..5ae3e7af10 100644
--- a/fftools/Makefile
+++ b/fftools/Makefile
@@ -19,10 +19,15 @@ OBJS-ffmpeg +=                  \
     fftools/ffmpeg_mux_init.o   \
     fftools/ffmpeg_opt.o        \
     fftools/ffmpeg_sched.o      \
+    fftools/fftools_log.o       \
     fftools/sync_queue.o        \
     fftools/thread_queue.o      \
 
-OBJS-ffplay += fftools/ffplay_renderer.o
+OBJS-ffprobe +=                 \
+    fftools/fftools_log.o       \
+
+OBJS-ffplay += fftools/ffplay_renderer.o  \
+               fftools/fftools_log.o      \
 
 define DOFFTOOL
 OBJS-$(1) += fftools/cmdutils.o fftools/opt_common.o fftools/$(1).o $(OBJS-$(1)-yes)
diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index dc321fb4a2..dc73d38f1f 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -81,6 +81,7 @@
 #include "ffmpeg.h"
 #include "ffmpeg_sched.h"
 #include "ffmpeg_utils.h"
+#include "fftools_log.h"
 
 const char program_name[] = "ffmpeg";
 const int program_birth_year = 2000;
@@ -955,6 +956,7 @@ int main(int argc, char **argv)
     setvbuf(stderr,NULL,_IONBF,0); /* win32 runtime needs this */
 
     av_log_set_flags(AV_LOG_SKIP_REPEATED);
+    init_logging();
     parse_loglevel(argc, argv, options);
 
 #if CONFIG_AVDEVICE
diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
index cd8a4abc52..57a83f6e3a 100644
--- a/fftools/ffmpeg_filter.c
+++ b/fftools/ffmpeg_filter.c
@@ -1,5 +1,5 @@
 /*
- * ffmpeg filter configuration
+ * Copyright (c) The FFmpeg developers
  *
  * This file is part of FFmpeg.
  *
diff --git a/fftools/ffplay.c b/fftools/ffplay.c
index 2a572fc3aa..e4e90187f5 100644
--- a/fftools/ffplay.c
+++ b/fftools/ffplay.c
@@ -57,6 +57,7 @@
 #include "cmdutils.h"
 #include "ffplay_renderer.h"
 #include "opt_common.h"
+#include "fftools_log.h"
 
 const char program_name[] = "ffplay";
 const int program_birth_year = 2003;
@@ -3762,6 +3763,7 @@ int main(int argc, char **argv)
     init_dynload();
 
     av_log_set_flags(AV_LOG_SKIP_REPEATED);
+    init_logging();
     parse_loglevel(argc, argv, options);
 
     /* register all codecs, demux and protocols */
diff --git a/fftools/ffprobe.c b/fftools/ffprobe.c
index 7341731d2f..2e4d6d0f3e 100644
--- a/fftools/ffprobe.c
+++ b/fftools/ffprobe.c
@@ -68,6 +68,7 @@
 #include "libavfilter/version.h"
 #include "cmdutils.h"
 #include "opt_common.h"
+#include "fftools_log.h"
 
 #include "libavutil/thread.h"
 
@@ -4652,6 +4653,7 @@ int main(int argc, char **argv)
     init_dynload();
 
     av_log_set_flags(AV_LOG_SKIP_REPEATED);
+    init_logging();
 
     options = real_options;
     parse_loglevel(argc, argv, options);
diff --git a/fftools/fftools_log.c b/fftools/fftools_log.c
new file mode 100644
index 0000000000..206dffe56f
--- /dev/null
+++ b/fftools/fftools_log.c
@@ -0,0 +1,480 @@
+/*
+ * Copyright (c) The FFmpeg developers
+ *
+ * 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"
+
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if HAVE_IO_H
+#include <io.h>
+#endif
+#include <inttypes.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "libavutil/bprint.h"
+#include "libavutil/common.h"
+//#include "libavutil/internal.h"
+#include "libavutil/log.h"
+#include "libavutil/thread.h"
+#include "libavutil/time.h"
+//#include "libavutil/time_internal.h"
+
+#include "fftools_log.h"
+
+
+#if !HAVE_LOCALTIME_R && !defined(localtime_r)
+static inline struct tm *ff_localtime_r(const time_t* clock, struct tm *result)
+{
+    struct tm *ptr = localtime(clock);
+    if (!ptr)
+        return NULL;
+    *result = *ptr;
+    return result;
+}
+#define localtime_r ff_localtime_r
+#endif
+
+static int nb_class_ids;
+
+#define NB_CLASS_IDS 1000
+static struct class_ids {
+    void *avcl;
+    uint64_t class_hash;
+    unsigned id;
+} class_ids[NB_CLASS_IDS];
+
+static uint64_t fnv_hash(const char *str)
+{
+    // FNV-1a 64-bit hash algorithm
+    uint64_t hash = 0xcbf29ce484222325ULL;
+    while (*str) {
+        hash ^= (unsigned char)*str++;
+        hash *= 0x100000001b3ULL;
+    }
+    return hash;
+}
+
+static unsigned get_class_id(void* avcl)
+{
+    AVClass* avc = avcl ? *(AVClass **) avcl : NULL;
+    unsigned i, nb_ids = 0;
+    uint64_t class_hash;
+
+    for (i = 0; i < NB_CLASS_IDS && class_ids[i].avcl; i++) {
+        if (class_ids[i].avcl == avcl)
+            return class_ids[i].id;
+    }
+
+    class_hash = fnv_hash(avc->class_name);
+
+    for (i = 0; i < NB_CLASS_IDS; i++) {
+        if (class_ids[i].class_hash == class_hash)
+            nb_ids++;
+
+        if (!class_ids[i].avcl) {
+            class_ids[i].avcl = avcl;
+            class_ids[i].class_hash = class_hash;
+            class_ids[i].id = nb_ids;
+            return class_ids[i].id;
+        }
+    }
+
+    // exceeded NB_CLASS_IDS entries in class_ids[]
+    return 0;
+}
+
+static AVMutex mutex = AV_MUTEX_INITIALIZER;
+
+#define LINE_SZ 1024
+
+#if HAVE_VALGRIND_VALGRIND_H && CONFIG_VALGRIND_BACKTRACE
+#include <valgrind/valgrind.h>
+/* this is the log level at which valgrind will output a full backtrace */
+#define BACKTRACE_LOGLEVEL AV_LOG_ERROR
+#endif
+
+#define NB_LEVELS 8
+#if defined(_WIN32) && HAVE_SETCONSOLETEXTATTRIBUTE && HAVE_GETSTDHANDLE
+#include <windows.h>
+static const uint8_t color[16 + AV_CLASS_CATEGORY_NB] = {
+    [AV_LOG_PANIC  /8] = 12,
+    [AV_LOG_FATAL  /8] = 12,
+    [AV_LOG_ERROR  /8] = 12,
+    [AV_LOG_WARNING/8] = 14,
+    [AV_LOG_INFO   /8] =  7,
+    [AV_LOG_VERBOSE/8] = 10,
+    [AV_LOG_DEBUG  /8] = 10,
+    [AV_LOG_TRACE  /8] = 8,
+    [16+AV_CLASS_CATEGORY_NA              ] =  7,
+    [16+AV_CLASS_CATEGORY_INPUT           ] = 13,
+    [16+AV_CLASS_CATEGORY_OUTPUT          ] =  5,
+    [16+AV_CLASS_CATEGORY_MUXER           ] = 13,
+    [16+AV_CLASS_CATEGORY_DEMUXER         ] =  5,
+    [16+AV_CLASS_CATEGORY_ENCODER         ] = 11,
+    [16+AV_CLASS_CATEGORY_DECODER         ] =  3,
+    [16+AV_CLASS_CATEGORY_FILTER          ] = 10,
+    [16+AV_CLASS_CATEGORY_BITSTREAM_FILTER] =  9,
+    [16+AV_CLASS_CATEGORY_SWSCALER        ] =  7,
+    [16+AV_CLASS_CATEGORY_SWRESAMPLER     ] =  7,
+    [16+AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT ] = 13,
+    [16+AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT  ] = 5,
+    [16+AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT ] = 13,
+    [16+AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT  ] = 5,
+    [16+AV_CLASS_CATEGORY_DEVICE_OUTPUT       ] = 13,
+    [16+AV_CLASS_CATEGORY_DEVICE_INPUT        ] = 5,
+};
+
+static int16_t background, attr_orig;
+static HANDLE con;
+#else
+
+static const uint32_t color[16 + AV_CLASS_CATEGORY_NB] = {
+    [AV_LOG_PANIC  /8] =  52 << 16 | 196 << 8 | 0x41,
+    [AV_LOG_FATAL  /8] = 208 <<  8 | 0x41,
+    [AV_LOG_ERROR  /8] = 196 <<  8 | 0x11,
+    [AV_LOG_WARNING/8] = 226 <<  8 | 0x03,
+    [AV_LOG_INFO   /8] = 253 <<  8 | 0x09,
+    [AV_LOG_VERBOSE/8] =  40 <<  8 | 0x02,
+    [AV_LOG_DEBUG  /8] =  34 <<  8 | 0x02,
+    [AV_LOG_TRACE  /8] =  34 <<  8 | 0x07,
+    [16+AV_CLASS_CATEGORY_NA              ] = 250 << 8 | 0x09,
+    [16+AV_CLASS_CATEGORY_INPUT           ] = 219 << 8 | 0x15,
+    [16+AV_CLASS_CATEGORY_OUTPUT          ] = 201 << 8 | 0x05,
+    [16+AV_CLASS_CATEGORY_MUXER           ] = 213 << 8 | 0x15,
+    [16+AV_CLASS_CATEGORY_DEMUXER         ] = 207 << 8 | 0x05,
+    [16+AV_CLASS_CATEGORY_ENCODER         ] =  51 << 8 | 0x16,
+    [16+AV_CLASS_CATEGORY_DECODER         ] =  39 << 8 | 0x06,
+    [16+AV_CLASS_CATEGORY_FILTER          ] = 155 << 8 | 0x12,
+    [16+AV_CLASS_CATEGORY_BITSTREAM_FILTER] = 192 << 8 | 0x14,
+    [16+AV_CLASS_CATEGORY_SWSCALER        ] = 153 << 8 | 0x14,
+    [16+AV_CLASS_CATEGORY_SWRESAMPLER     ] = 147 << 8 | 0x14,
+    [16+AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT ] = 213 << 8 | 0x15,
+    [16+AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT  ] = 207 << 8 | 0x05,
+    [16+AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT ] = 213 << 8 | 0x15,
+    [16+AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT  ] = 207 << 8 | 0x05,
+    [16+AV_CLASS_CATEGORY_DEVICE_OUTPUT       ] = 213 << 8 | 0x15,
+    [16+AV_CLASS_CATEGORY_DEVICE_INPUT        ] = 207 << 8 | 0x05,
+};
+
+#endif
+static int use_color = -1;
+
+#if defined(_WIN32) && HAVE_SETCONSOLETEXTATTRIBUTE && HAVE_GETSTDHANDLE
+static void win_console_puts(const char *str)
+{
+    const uint8_t *q = str;
+    uint16_t line[LINE_SZ];
+
+    while (*q) {
+        uint16_t *buf = line;
+        DWORD nb_chars = 0;
+        DWORD written;
+
+        while (*q && nb_chars < LINE_SZ - 1) {
+            uint32_t ch;
+            uint16_t tmp;
+
+            GET_UTF8(ch, *q ? *q++ : 0, ch = 0xfffd; goto continue_on_invalid;)
+continue_on_invalid:
+            PUT_UTF16(ch, tmp, *buf++ = tmp; nb_chars++;)
+        }
+
+        WriteConsoleW(con, line, nb_chars, &written, NULL);
+    }
+}
+#endif
+
+static void check_color_terminal(void)
+{
+    char *term = getenv("TERM");
+
+#if defined(_WIN32) && HAVE_SETCONSOLETEXTATTRIBUTE && HAVE_GETSTDHANDLE
+    CONSOLE_SCREEN_BUFFER_INFO con_info;
+    DWORD dummy;
+    con = GetStdHandle(STD_ERROR_HANDLE);
+    if (con != INVALID_HANDLE_VALUE && !GetConsoleMode(con, &dummy))
+        con = INVALID_HANDLE_VALUE;
+    if (con != INVALID_HANDLE_VALUE) {
+        GetConsoleScreenBufferInfo(con, &con_info);
+        attr_orig  = con_info.wAttributes;
+        background = attr_orig & 0xF0;
+    }
+#endif
+
+    if (getenv("AV_LOG_FORCE_NOCOLOR")) {
+        use_color = 0;
+    } else if (getenv("AV_LOG_FORCE_COLOR")) {
+        use_color = 1;
+    } else {
+#if defined(_WIN32) && HAVE_SETCONSOLETEXTATTRIBUTE && HAVE_GETSTDHANDLE
+        use_color = (con != INVALID_HANDLE_VALUE);
+#elif HAVE_ISATTY
+        use_color = (term && isatty(2));
+#else
+        use_color = 0;
+#endif
+    }
+
+    if (getenv("AV_LOG_FORCE_256COLOR") || term && strstr(term, "256color"))
+        use_color *= 256;
+}
+
+static void ansi_fputs(int level, int tint, const char *str, int local_use_color)
+{
+    if (local_use_color == 1) {
+        fprintf(stderr,
+                "\033[%"PRIu32";3%"PRIu32"m%s\033[0m",
+                (color[level] >> 4) & 15,
+                color[level] & 15,
+                str);
+    } else if (tint && use_color == 256) {
+        fprintf(stderr,
+                "\033[48;5;%"PRIu32"m\033[38;5;%dm%s\033[0m",
+                (color[level] >> 16) & 0xff,
+                tint,
+                str);
+    } else if (local_use_color == 256) {
+        fprintf(stderr,
+                "\033[48;5;%"PRIu32"m\033[38;5;%"PRIu32"m%s\033[0m",
+                (color[level] >> 16) & 0xff,
+                (color[level] >> 8) & 0xff,
+                str);
+    } else
+        fputs(str, stderr);
+}
+
+static void colored_fputs(int level, int tint, const char *str)
+{
+    int local_use_color;
+    if (!*str)
+        return;
+
+    if (use_color < 0)
+        check_color_terminal();
+
+    if (level == AV_LOG_INFO/8) local_use_color = 0;
+    else                        local_use_color = use_color;
+
+#if defined(_WIN32) && HAVE_SETCONSOLETEXTATTRIBUTE && HAVE_GETSTDHANDLE
+    if (con != INVALID_HANDLE_VALUE) {
+        if (local_use_color)
+            SetConsoleTextAttribute(con, background | color[level]);
+        win_console_puts(str);
+        if (local_use_color)
+            SetConsoleTextAttribute(con, attr_orig);
+    } else {
+        ansi_fputs(level, tint, str, local_use_color);
+    }
+#else
+    ansi_fputs(level, tint, str, local_use_color);
+#endif
+
+}
+
+static void sanitize(uint8_t *line){
+    while(*line){
+        if(*line < 0x08 || (*line > 0x0D && *line < 0x20))
+            *line='?';
+        line++;
+    }
+}
+
+static int get_category(void *ptr){
+    AVClass *avc = *(AVClass **) ptr;
+    if(    !avc
+        || (avc->version&0xFF)<100
+        ||  avc->version < (51 << 16 | 59 << 8)
+        ||  avc->category >= AV_CLASS_CATEGORY_NB) return AV_CLASS_CATEGORY_NA + 16;
+
+    if(avc->get_category)
+        return avc->get_category(ptr) + 16;
+
+    return avc->category + 16;
+}
+
+static const char *get_level_str(int level)
+{
+    switch (level) {
+    case AV_LOG_QUIET:
+        return "quiet";
+    case AV_LOG_DEBUG:
+        return "debug";
+    case AV_LOG_TRACE:
+        return "trace";
+    case AV_LOG_VERBOSE:
+        return "verbose";
+    case AV_LOG_INFO:
+        return "info";
+    case AV_LOG_WARNING:
+        return "warning";
+    case AV_LOG_ERROR:
+        return "error";
+    case AV_LOG_FATAL:
+        return "fatal";
+    case AV_LOG_PANIC:
+        return "panic";
+    default:
+        return "";
+    }
+}
+
+static const char *item_name(void *obj, const AVClass *cls)
+{
+    return (cls->item_name ? cls->item_name : av_default_item_name)(obj);
+}
+
+static void format_date_now(AVBPrint* bp_time, int include_date)
+{
+    struct tm *ptm, tmbuf;
+    const int64_t time_us = av_gettime();
+    const int64_t time_ms = time_us / 1000;
+    const time_t time_s   = time_ms / 1000;
+    const int millisec    = time_ms - (time_s * 1000);
+    ptm                   = localtime_r(&time_s, &tmbuf);
+    if (ptm) {
+        if (include_date)
+            av_bprint_strftime(bp_time, "%Y-%m-%d ", ptm);
+
+        av_bprint_strftime(bp_time, "%H:%M:%S", ptm);
+        av_bprintf(bp_time, ".%03d ", millisec);
+    }
+}
+
+static void log_formatprefix(AVBPrint* buffer, AVClass** avcl, int log_flags)
+{
+    const int print_mem = log_flags & AV_LOG_PRINT_MEMADDRESSES;
+    if (print_mem)
+        av_bprintf(buffer+0, "[%s @ %p] ", item_name(avcl, *avcl), avcl);
+    else
+        av_bprintf(buffer+0, "[%s #%u] ", item_name(avcl, *avcl), get_class_id(avcl));
+}
+
+static void format_line(void *avcl, int level, const char *fmt, va_list vl,
+                        AVBPrint part[5], int *print_prefix, int type[2], int current_flags)
+{
+    AVClass* avc = avcl ? *(AVClass **) avcl : NULL;
+    av_bprint_init(part+0, 0, AV_BPRINT_SIZE_AUTOMATIC);
+    av_bprint_init(part+1, 0, AV_BPRINT_SIZE_AUTOMATIC);
+    av_bprint_init(part+2, 0, AV_BPRINT_SIZE_AUTOMATIC);
+    av_bprint_init(part+3, 0, 65536);
+    av_bprint_init(part+4, 0, AV_BPRINT_SIZE_AUTOMATIC);
+
+    if(type) type[0] = type[1] = AV_CLASS_CATEGORY_NA + 16;
+    if (*print_prefix && avc) {
+
+        if (avc->parent_log_context_offset) {
+            AVClass** parent = *(AVClass ***) ((uint8_t *)avcl + avc->parent_log_context_offset);
+            if (parent && *parent) {
+                log_formatprefix(part, parent, current_flags);
+                if(type) type[0] = get_category(parent);
+            }
+        }
+        log_formatprefix(part, avcl, current_flags);
+
+        if(type) type[1] = get_category(avcl);
+    }
+
+    if (*print_prefix && (level > AV_LOG_QUIET) && (current_flags & (AV_LOG_PRINT_TIME | AV_LOG_PRINT_DATETIME)))
+        format_date_now(&part[4], current_flags & AV_LOG_PRINT_DATETIME);
+
+    if (*print_prefix && (level > AV_LOG_QUIET) && (current_flags & AV_LOG_PRINT_LEVEL))
+        av_bprintf(part+2, "[%s] ", get_level_str(level));
+
+    av_vbprintf(part+3, fmt, vl);
+
+    if(*part[0].str || *part[1].str || *part[2].str || *part[3].str) {
+        char lastc = part[3].len && part[3].len <= part[3].size ? part[3].str[part[3].len - 1] : 0;
+        *print_prefix = lastc == '\n' || lastc == '\r';
+    }
+}
+
+void fftools_log_callback(void* ptr, int level, const char* fmt, va_list vl)
+{
+    static int print_prefix = 1;
+    static int count;
+    static char prev[LINE_SZ];
+    AVBPrint part[5];
+    char line[LINE_SZ];
+    static int is_atty;
+    int type[2];
+    unsigned tint = 0;
+    int current_flags = 0;
+
+    if (level >= 0) {
+        tint = level & 0xff00;
+        level &= 0xff;
+    }
+
+    if (level > av_log_get_level())
+        return;
+
+    current_flags = av_log_get_flags();
+    ff_mutex_lock(&mutex);
+
+    format_line(ptr, level, fmt, vl, part, &print_prefix, type, current_flags);
+    snprintf(line, sizeof(line), "%s%s%s%s", part[0].str, part[1].str, part[2].str, part[3].str);
+
+#if HAVE_ISATTY
+    if (!is_atty)
+        is_atty = isatty(2) ? 1 : -1;
+#endif
+
+    if (print_prefix && (current_flags & AV_LOG_SKIP_REPEATED) && !strcmp(line, prev) &&
+        *line && line[strlen(line) - 1] != '\r'){
+        count++;
+        if (is_atty == 1)
+            fprintf(stderr, "    Last message repeated %d times\r", count);
+        goto end;
+    }
+    if (count > 0) {
+        fprintf(stderr, "    Last message repeated %d times\n", count);
+        count = 0;
+    }
+    strcpy(prev, line);
+
+    sanitize(part[4].str);
+    colored_fputs(7, 0, part[4].str);
+    sanitize(part[0].str);
+    colored_fputs(type[0], 0, part[0].str);
+    sanitize(part[1].str);
+    colored_fputs(type[1], 0, part[1].str);
+    sanitize(part[2].str);
+    colored_fputs(av_clip(level >> 3, 0, NB_LEVELS - 1), tint >> 8, part[2].str);
+    sanitize(part[3].str);
+    colored_fputs(av_clip(level >> 3, 0, NB_LEVELS - 1), tint >> 8, part[3].str);
+
+#if CONFIG_VALGRIND_BACKTRACE
+    if (level <= BACKTRACE_LOGLEVEL)
+        VALGRIND_PRINTF_BACKTRACE("%s", "");
+#endif
+end:
+    av_bprint_finalize(part+3, NULL);
+    ff_mutex_unlock(&mutex);
+}
+
+
+void init_logging(void)
+{
+    av_log_set_callback(&fftools_log_callback);
+}
diff --git a/fftools/fftools_log.h b/fftools/fftools_log.h
new file mode 100644
index 0000000000..da24866045
--- /dev/null
+++ b/fftools/fftools_log.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) The FFmpeg developers
+ *
+ * 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
+ */
+
+#ifndef FFTOOLS_FFTOOLS_LOG_H
+#define FFTOOLS_FFTOOLS_LOG_H
+
+#include <stdint.h>
+
+#include "config.h"
+#include "libavcodec/avcodec.h"
+#include "libavfilter/avfilter.h"
+#include "libavformat/avformat.h"
+#include "libswscale/swscale.h"
+
+
+/**
+ * Custom logging callback for fftools.
+ */
+void fftools_log_callback(void* ptr, int level, const char* fmt, va_list vl);
+
+/**
+ * Sets the logging callback function.
+ */
+void init_logging(void);
+
+
+#endif /* FFTOOLS_FFTOOLS_LOG_H */
-- 
ffmpeg-codebot

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