[FFmpeg-devel] [PATCH v9 07/15] fftools/textformat: Introduce common header and deduplicate code

[softworkz <ffmpegagent@gmail.com>]

From: softworkz <softworkz@hotmail.com>

Also change writer_printf signature in AVTextWriter to use va_list,
so that it can be called by the new function writer_printf()
in tf_internal.h.

Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: softworkz <softworkz@hotmail.com>
---
 fftools/textformat/avtextwriters.h |  2 +-
 fftools/textformat/tf_compact.c    | 32 ++++-------
 fftools/textformat/tf_default.c    | 27 +++-------
 fftools/textformat/tf_flat.c       | 25 +++------
 fftools/textformat/tf_ini.c        | 24 +++------
 fftools/textformat/tf_internal.h   | 85 ++++++++++++++++++++++++++++++
 fftools/textformat/tf_json.c       | 43 +++++++--------
 fftools/textformat/tf_xml.c        | 35 +++++-------
 fftools/textformat/tw_avio.c       |  9 ++--
 fftools/textformat/tw_buffer.c     |  9 ++--
 fftools/textformat/tw_stdout.c     | 10 ++--
 11 files changed, 160 insertions(+), 141 deletions(-)
 create mode 100644 fftools/textformat/tf_internal.h

diff --git a/fftools/textformat/avtextwriters.h b/fftools/textformat/avtextwriters.h
index fd5cda04ef..9297babeb1 100644
--- a/fftools/textformat/avtextwriters.h
+++ b/fftools/textformat/avtextwriters.h
@@ -36,7 +36,7 @@ typedef struct AVTextWriter {
     void (*uninit)(AVTextWriterContext *wctx);
     void (*writer_w8)(AVTextWriterContext *wctx, int b);
     void (*writer_put_str)(AVTextWriterContext *wctx, const char *str);
-    void (*writer_printf)(AVTextWriterContext *wctx, const char *fmt, ...);
+    void (*writer_vprintf)(AVTextWriterContext *wctx, const char *fmt, va_list vl);
 } AVTextWriter;
 
 typedef struct AVTextWriterContext {
diff --git a/fftools/textformat/tf_compact.c b/fftools/textformat/tf_compact.c
index d4ac296a42..e52888239e 100644
--- a/fftools/textformat/tf_compact.c
+++ b/fftools/textformat/tf_compact.c
@@ -28,23 +28,7 @@
 #include "libavutil/bprint.h"
 #include "libavutil/error.h"
 #include "libavutil/opt.h"
-
-
-#define writer_w8(wctx_, b_) (wctx_)->writer->writer->writer_w8((wctx_)->writer, b_)
-#define writer_put_str(wctx_, str_) (wctx_)->writer->writer->writer_put_str((wctx_)->writer, str_)
-#define writer_printf(wctx_, fmt_, ...) (wctx_)->writer->writer->writer_printf((wctx_)->writer, fmt_, __VA_ARGS__)
-
-
-#define DEFINE_FORMATTER_CLASS(name)                   \
-static const char *name##_get_name(void *ctx)       \
-{                                                   \
-    return #name ;                                  \
-}                                                   \
-static const AVClass name##_class = {               \
-    .class_name = #name,                            \
-    .item_name  = name##_get_name,                  \
-    .option     = name##_options                    \
-}
+#include "tf_internal.h"
 
 
 /* Compact output */
@@ -157,9 +141,12 @@ static av_cold int compact_init(AVTextFormatContext *wctx)
 static void compact_print_section_header(AVTextFormatContext *wctx, const void *data)
 {
     CompactContext *compact = wctx->priv;
-    const struct AVTextFormatSection *section = wctx->section[wctx->level];
-    const struct AVTextFormatSection *parent_section = wctx->level ?
-        wctx->section[wctx->level-1] : NULL;
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+    const AVTextFormatSection *parent_section = tf_get_parent_section(wctx, wctx->level);
+
+    if (!section)
+        return;
+
     compact->terminate_line[wctx->level] = 1;
     compact->has_nested_elems[wctx->level] = 0;
 
@@ -210,8 +197,11 @@ static void compact_print_section_header(AVTextFormatContext *wctx, const void *
 
 static void compact_print_section_footer(AVTextFormatContext *wctx)
 {
-    const struct AVTextFormatSection *section = wctx->section[wctx->level];
     CompactContext *compact = wctx->priv;
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+
+    if (!section)
+        return;
 
     if (!compact->nested_section[wctx->level] &&
         compact->terminate_line[wctx->level] &&
diff --git a/fftools/textformat/tf_default.c b/fftools/textformat/tf_default.c
index ad97173b0b..019bda9d44 100644
--- a/fftools/textformat/tf_default.c
+++ b/fftools/textformat/tf_default.c
@@ -27,21 +27,7 @@
 #include "avtextformat.h"
 #include "libavutil/bprint.h"
 #include "libavutil/opt.h"
-
-#define writer_w8(wctx_, b_) (wctx_)->writer->writer->writer_w8((wctx_)->writer, b_)
-#define writer_put_str(wctx_, str_) (wctx_)->writer->writer->writer_put_str((wctx_)->writer, str_)
-#define writer_printf(wctx_, fmt_, ...) (wctx_)->writer->writer->writer_printf((wctx_)->writer, fmt_, __VA_ARGS__)
-
-#define DEFINE_FORMATTER_CLASS(name)                   \
-static const char *name##_get_name(void *ctx)       \
-{                                                   \
-    return #name ;                                  \
-}                                                   \
-static const AVClass name##_class = {               \
-    .class_name = #name,                            \
-    .item_name  = name##_get_name,                  \
-    .option     = name##_options                    \
-}
+#include "tf_internal.h"
 
 /* Default output */
 
@@ -80,9 +66,11 @@ static void default_print_section_header(AVTextFormatContext *wctx, const void *
 {
     DefaultContext *def = wctx->priv;
     char buf[32];
-    const struct AVTextFormatSection *section = wctx->section[wctx->level];
-    const struct AVTextFormatSection *parent_section = wctx->level ?
-        wctx->section[wctx->level-1] : NULL;
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+    const AVTextFormatSection *parent_section = tf_get_parent_section(wctx, wctx->level);
+
+    if (!section)
+        return;
 
     av_bprint_clear(&wctx->section_pbuf[wctx->level]);
     if (parent_section &&
@@ -104,7 +92,8 @@ static void default_print_section_header(AVTextFormatContext *wctx, const void *
 static void default_print_section_footer(AVTextFormatContext *wctx)
 {
     DefaultContext *def = wctx->priv;
-    const struct AVTextFormatSection *section = wctx->section[wctx->level];
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+
     char buf[32];
 
     if (!section)
diff --git a/fftools/textformat/tf_flat.c b/fftools/textformat/tf_flat.c
index f692971bcc..d5517f109b 100644
--- a/fftools/textformat/tf_flat.c
+++ b/fftools/textformat/tf_flat.c
@@ -28,22 +28,7 @@
 #include "libavutil/bprint.h"
 #include "libavutil/error.h"
 #include "libavutil/opt.h"
-
-#define writer_w8(wctx_, b_) (wctx_)->writer->writer->writer_w8((wctx_)->writer, b_)
-#define writer_put_str(wctx_, str_) (wctx_)->writer->writer->writer_put_str((wctx_)->writer, str_)
-#define writer_printf(wctx_, fmt_, ...) (wctx_)->writer->writer->writer_printf((wctx_)->writer, fmt_, __VA_ARGS__)
-
-#define DEFINE_FORMATTER_CLASS(name)                   \
-static const char *name##_get_name(void *ctx)       \
-{                                                   \
-    return #name ;                                  \
-}                                                   \
-static const AVClass name##_class = {               \
-    .class_name = #name,                            \
-    .item_name  = name##_get_name,                  \
-    .option     = name##_options                    \
-}
-
+#include "tf_internal.h"
 
 /* Flat output */
 
@@ -118,9 +103,11 @@ static void flat_print_section_header(AVTextFormatContext *wctx, const void *dat
 {
     FlatContext *flat = wctx->priv;
     AVBPrint *buf = &wctx->section_pbuf[wctx->level];
-    const struct AVTextFormatSection *section = wctx->section[wctx->level];
-    const struct AVTextFormatSection *parent_section = wctx->level ?
-        wctx->section[wctx->level-1] : NULL;
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+    const AVTextFormatSection *parent_section = tf_get_parent_section(wctx, wctx->level);
+
+    if (!section)
+        return;
 
     /* build section header */
     av_bprint_clear(buf);
diff --git a/fftools/textformat/tf_ini.c b/fftools/textformat/tf_ini.c
index dd77d0e8bf..8959785295 100644
--- a/fftools/textformat/tf_ini.c
+++ b/fftools/textformat/tf_ini.c
@@ -28,21 +28,7 @@
 
 #include "libavutil/bprint.h"
 #include "libavutil/opt.h"
-
-#define writer_w8(wctx_, b_) (wctx_)->writer->writer->writer_w8((wctx_)->writer, b_)
-#define writer_put_str(wctx_, str_) (wctx_)->writer->writer->writer_put_str((wctx_)->writer, str_)
-#define writer_printf(wctx_, fmt_, ...) (wctx_)->writer->writer->writer_printf((wctx_)->writer, fmt_, __VA_ARGS__)
-
-#define DEFINE_FORMATTER_CLASS(name)                   \
-static const char *name##_get_name(void *ctx)       \
-{                                                   \
-    return #name ;                                  \
-}                                                   \
-static const AVClass name##_class = {               \
-    .class_name = #name,                            \
-    .item_name  = name##_get_name,                  \
-    .option     = name##_options                    \
-}
+#include "tf_internal.h"
 
 /* Default output */
 
@@ -104,9 +90,11 @@ static void ini_print_section_header(AVTextFormatContext *wctx, const void *data
 {
     INIContext *ini = wctx->priv;
     AVBPrint *buf = &wctx->section_pbuf[wctx->level];
-    const struct AVTextFormatSection *section = wctx->section[wctx->level];
-    const struct AVTextFormatSection *parent_section = wctx->level ?
-        wctx->section[wctx->level-1] : NULL;
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+    const AVTextFormatSection *parent_section = tf_get_parent_section(wctx, wctx->level);
+
+    if (!section)
+        return;
 
     av_bprint_clear(buf);
     if (!parent_section) {
diff --git a/fftools/textformat/tf_internal.h b/fftools/textformat/tf_internal.h
new file mode 100644
index 0000000000..362a4cbc38
--- /dev/null
+++ b/fftools/textformat/tf_internal.h
@@ -0,0 +1,85 @@
+/*
+ * 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
+ */
+
+/**
+ * @file
+ * Internal utilities for text formatters.
+ */
+
+#ifndef FFTOOLS_TEXTFORMAT_TF_INTERNAL_H
+#define FFTOOLS_TEXTFORMAT_TF_INTERNAL_H
+
+#include "avtextformat.h"
+
+#define DEFINE_FORMATTER_CLASS(name)                \
+static const char *name##_get_name(void *ctx)       \
+{                                                   \
+    return #name ;                                  \
+}                                                   \
+static const AVClass name##_class = {               \
+    .class_name = #name,                            \
+    .item_name  = name##_get_name,                  \
+    .option     = name##_options                    \
+}
+
+
+/**
+ * Safely validate and access a section at a given level
+ */
+static inline const AVTextFormatSection *tf_get_section(AVTextFormatContext *tfc, int level)
+{
+    if (!tfc || level < 0 || level >= SECTION_MAX_NB_LEVELS || !tfc->section[level]) {
+        if (tfc)
+            av_log(tfc, AV_LOG_ERROR, "Invalid section access at level %d\n", level);
+        return NULL;
+    }
+    return tfc->section[level];
+}
+
+/**
+ * Safely access the parent section
+ */
+static inline const AVTextFormatSection *tf_get_parent_section(AVTextFormatContext *tfc, int level)
+{
+    if (level <= 0)
+        return NULL;
+
+    return tf_get_section(tfc, level - 1);
+}
+
+static inline void writer_w8(AVTextFormatContext *wctx, int b)
+{
+    wctx->writer->writer->writer_w8(wctx->writer, b);
+}
+
+static inline void writer_put_str(AVTextFormatContext *wctx, const char *str)
+{
+    wctx->writer->writer->writer_put_str(wctx->writer, str);
+}
+
+static inline void writer_printf(AVTextFormatContext *wctx, const char *fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    wctx->writer->writer->writer_vprintf(wctx->writer, fmt, args);
+    va_end(args);
+}
+
+#endif /* FFTOOLS_TEXTFORMAT_TF_INTERNAL_H */
diff --git a/fftools/textformat/tf_json.c b/fftools/textformat/tf_json.c
index 50c3d90440..78ea5dc21f 100644
--- a/fftools/textformat/tf_json.c
+++ b/fftools/textformat/tf_json.c
@@ -27,22 +27,7 @@
 #include "avtextformat.h"
 #include "libavutil/bprint.h"
 #include "libavutil/opt.h"
-
-#define writer_w8(wctx_, b_) (wctx_)->writer->writer->writer_w8((wctx_)->writer, b_)
-#define writer_put_str(wctx_, str_) (wctx_)->writer->writer->writer_put_str((wctx_)->writer, str_)
-#define writer_printf(wctx_, fmt_, ...) (wctx_)->writer->writer->writer_printf((wctx_)->writer, fmt_, __VA_ARGS__)
-
-#define DEFINE_FORMATTER_CLASS(name)                   \
-static const char *name##_get_name(void *ctx)       \
-{                                                   \
-    return #name ;                                  \
-}                                                   \
-static const AVClass name##_class = {               \
-    .class_name = #name,                            \
-    .item_name  = name##_get_name,                  \
-    .option     = name##_options                    \
-}
-
+#include "tf_internal.h"
 
 /* JSON output */
 
@@ -103,10 +88,13 @@ static const char *json_escape_str(AVBPrint *dst, const char *src, void *log_ctx
 
 static void json_print_section_header(AVTextFormatContext *wctx, const void *data)
 {
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+    const AVTextFormatSection *parent_section = tf_get_parent_section(wctx, wctx->level);
     JSONContext *json = wctx->priv;
     AVBPrint buf;
-    const AVTextFormatSection *section = wctx->section[wctx->level];
-    const AVTextFormatSection *parent_section = wctx->level ? wctx->section[wctx->level - 1] : NULL;
+
+    if (!section)
+        return;
 
     if (wctx->level && wctx->nb_item[wctx->level - 1])
         writer_put_str(wctx, ",\n");
@@ -141,8 +129,11 @@ static void json_print_section_header(AVTextFormatContext *wctx, const void *dat
 
 static void json_print_section_footer(AVTextFormatContext *wctx)
 {
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
     JSONContext *json = wctx->priv;
-    const struct AVTextFormatSection *section = wctx->section[wctx->level];
+
+    if (!section)
+        return;
 
     if (wctx->level == 0) {
         json->indent_level--;
@@ -175,9 +166,12 @@ static inline void json_print_item_str(AVTextFormatContext *wctx,
 
 static void json_print_str(AVTextFormatContext *wctx, const char *key, const char *value)
 {
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+    const AVTextFormatSection *parent_section = tf_get_parent_section(wctx, wctx->level);
     JSONContext *json = wctx->priv;
-    const struct AVTextFormatSection *parent_section = wctx->level ?
-        wctx->section[wctx->level-1] : NULL;
+
+    if (!section)
+        return;
 
     if (wctx->nb_item[wctx->level] || (parent_section && parent_section->flags & AV_TEXTFORMAT_SECTION_FLAG_NUMBERING_BY_TYPE))
         writer_put_str(wctx, json->item_sep);
@@ -188,10 +182,14 @@ static void json_print_str(AVTextFormatContext *wctx, const char *key, const cha
 
 static void json_print_int(AVTextFormatContext *wctx, const char *key, int64_t value)
 {
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+    const AVTextFormatSection *parent_section = tf_get_parent_section(wctx, wctx->level);
     JSONContext *json = wctx->priv;
-    const AVTextFormatSection *parent_section = wctx->level ? wctx->section[wctx->level - 1] : NULL;
     AVBPrint buf;
 
+    if (!section)
+        return;
+
     if (wctx->nb_item[wctx->level] || (parent_section && parent_section->flags & AV_TEXTFORMAT_SECTION_FLAG_NUMBERING_BY_TYPE))
         writer_put_str(wctx, json->item_sep);
     if (!json->compact)
@@ -213,4 +211,3 @@ const AVTextFormatter avtextformatter_json = {
     .flags = AV_TEXTFORMAT_FLAG_SUPPORTS_MIXED_ARRAY_CONTENT,
     .priv_class           = &json_class,
 };
-
diff --git a/fftools/textformat/tf_xml.c b/fftools/textformat/tf_xml.c
index 28abfc6400..6b09e09ab4 100644
--- a/fftools/textformat/tf_xml.c
+++ b/fftools/textformat/tf_xml.c
@@ -25,21 +25,7 @@
 #include "libavutil/bprint.h"
 #include "libavutil/error.h"
 #include "libavutil/opt.h"
-
-#define writer_w8(wctx_, b_) (wctx_)->writer->writer->writer_w8((wctx_)->writer, b_)
-#define writer_put_str(wctx_, str_) (wctx_)->writer->writer->writer_put_str((wctx_)->writer, str_)
-#define writer_printf(wctx_, fmt_, ...) (wctx_)->writer->writer->writer_printf((wctx_)->writer, fmt_, __VA_ARGS__)
-
-#define DEFINE_FORMATTER_CLASS(name)                   \
-static const char *name##_get_name(void *ctx)       \
-{                                                   \
-    return #name ;                                  \
-}                                                   \
-static const AVClass name##_class = {               \
-    .class_name = #name,                            \
-    .item_name  = name##_get_name,                  \
-    .option     = name##_options                    \
-}
+#include "tf_internal.h"
 
 /* XML output */
 
@@ -90,9 +76,11 @@ static av_cold int xml_init(AVTextFormatContext *wctx)
 static void xml_print_section_header(AVTextFormatContext *wctx, const void *data)
 {
     XMLContext *xml = wctx->priv;
-    const struct AVTextFormatSection *section = wctx->section[wctx->level];
-    const struct AVTextFormatSection *parent_section = wctx->level ?
-        wctx->section[wctx->level-1] : NULL;
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+    const AVTextFormatSection *parent_section = tf_get_parent_section(wctx, wctx->level);
+
+    if (!section)
+        return;
 
     if (wctx->level == 0) {
         const char *qual = " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" "
@@ -138,7 +126,10 @@ static void xml_print_section_header(AVTextFormatContext *wctx, const void *data
 static void xml_print_section_footer(AVTextFormatContext *wctx)
 {
     XMLContext *xml = wctx->priv;
-    const struct AVTextFormatSection *section = wctx->section[wctx->level];
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+
+    if (!section)
+        return;
 
     if (wctx->level == 0) {
         writer_printf(wctx, "</%sffprobe>\n", xml->fully_qualified ? "ffprobe:" : "");
@@ -158,7 +149,10 @@ static void xml_print_value(AVTextFormatContext *wctx, const char *key,
 {
     AVBPrint buf;
     XMLContext *xml = wctx->priv;
-    const struct AVTextFormatSection *section = wctx->section[wctx->level];
+    const AVTextFormatSection *section = tf_get_section(wctx, wctx->level);
+
+    if (!section)
+        return;
 
     av_bprint_init(&buf, 1, AV_BPRINT_SIZE_UNLIMITED);
 
@@ -216,4 +210,3 @@ const AVTextFormatter avtextformatter_xml = {
     .flags = AV_TEXTFORMAT_FLAG_SUPPORTS_MIXED_ARRAY_CONTENT,
     .priv_class           = &xml_class,
 };
-
diff --git a/fftools/textformat/tw_avio.c b/fftools/textformat/tw_avio.c
index fc4c8b5dff..39c63d8c9a 100644
--- a/fftools/textformat/tw_avio.c
+++ b/fftools/textformat/tw_avio.c
@@ -57,14 +57,11 @@ static void io_put_str(AVTextWriterContext *wctx, const char *str)
     avio_write(ctx->avio_context, (const unsigned char *)str, (int)strlen(str));
 }
 
-static void io_printf(AVTextWriterContext *wctx, const char *fmt, ...)
+static void io_vprintf(AVTextWriterContext *wctx, const char *fmt, va_list vl)
 {
     IOWriterContext *ctx = wctx->priv;
-    va_list ap;
 
-    va_start(ap, fmt);
-    avio_vprintf(ctx->avio_context, fmt, ap);
-    va_end(ap);
+    avio_vprintf(ctx->avio_context, fmt, vl);
 }
 
 
@@ -73,7 +70,7 @@ const AVTextWriter avtextwriter_avio = {
     .priv_size            = sizeof(IOWriterContext),
     .uninit               = iowriter_uninit,
     .writer_put_str       = io_put_str,
-    .writer_printf        = io_printf,
+    .writer_vprintf       = io_vprintf,
     .writer_w8            = io_w8
 };
 
diff --git a/fftools/textformat/tw_buffer.c b/fftools/textformat/tw_buffer.c
index f8b38414a6..f6e63445d9 100644
--- a/fftools/textformat/tw_buffer.c
+++ b/fftools/textformat/tw_buffer.c
@@ -56,14 +56,11 @@ static void buffer_put_str(AVTextWriterContext *wctx, const char *str)
     av_bprintf(ctx->buffer, "%s", str);
 }
 
-static void buffer_printf(AVTextWriterContext *wctx, const char *fmt, ...)
+static void buffer_vprintf(AVTextWriterContext *wctx, const char *fmt, va_list vl)
 {
     BufferWriterContext *ctx = wctx->priv;
 
-    va_list vargs;
-    va_start(vargs, fmt);
-    av_vbprintf(ctx->buffer, fmt, vargs);
-    va_end(vargs);
+    av_vbprintf(ctx->buffer, fmt, vl);
 }
 
 
@@ -72,7 +69,7 @@ const AVTextWriter avtextwriter_buffer = {
     .priv_size            = sizeof(BufferWriterContext),
     .priv_class           = &bufferwriter_class,
     .writer_put_str       = buffer_put_str,
-    .writer_printf        = buffer_printf,
+    .writer_vprintf       = buffer_vprintf,
     .writer_w8            = buffer_w8
 };
 
diff --git a/fftools/textformat/tw_stdout.c b/fftools/textformat/tw_stdout.c
index 23de6f671f..3e2a8dd0d4 100644
--- a/fftools/textformat/tw_stdout.c
+++ b/fftools/textformat/tw_stdout.c
@@ -53,13 +53,9 @@ static inline void stdout_put_str(AVTextWriterContext *wctx, const char *str)
     printf("%s", str);
 }
 
-static inline void stdout_printf(AVTextWriterContext *wctx, const char *fmt, ...)
+static inline void stdout_vprintf(AVTextWriterContext *wctx, const char *fmt, va_list vl)
 {
-    va_list ap;
-
-    va_start(ap, fmt);
-    vprintf(fmt, ap);
-    va_end(ap);
+    vprintf(fmt, vl);
 }
 
 
@@ -68,7 +64,7 @@ static const AVTextWriter avtextwriter_stdout = {
     .priv_size            = sizeof(StdOutWriterContext),
     .priv_class           = &stdoutwriter_class,
     .writer_put_str       = stdout_put_str,
-    .writer_printf        = stdout_printf,
+    .writer_vprintf       = stdout_vprintf,
     .writer_w8            = stdout_w8
 };
 
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