Move FFmpeg io device helpers to a separate file

The helpers are to be reused in the media recording, so they should
be in a separate file.

Task-number: QTBUG-121827
Pick-to: 6.5
Change-Id: I3436a1a297f94deeb5a760ef6c10e26e03d03bed
Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>
Reviewed-by: Tim Blechmann <tim@klingt.org>
(cherry picked from commit 6cc59580b31f000e7aa1681c02245d567de3e520)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 6ca1ebae7555ff5996602725b39c8458d0a1bed4)

4 files changed, 78 insertions, 30 deletions

diff --git a/src/plugins/multimedia/ffmpeg/CMakeLists.txt b/src/plugins/multimedia/ffmpeg/CMakeLists.txt
index 3cfb11ff7..0da23e163 100644
--- a/src/plugins/multimedia/ffmpeg/CMakeLists.txt
+++ b/src/plugins/multimedia/ffmpeg/CMakeLists.txt
@@ -17,6 +17,7 @@ qt_internal_add_plugin(QFFmpegMediaPlugin
     SOURCES
         qffmpeg.cpp qffmpeg_p.h
         qffmpegdefs_p.h
+        qffmpegioutils.cpp qffmpegioutils_p.h
         qffmpegavaudioformat.cpp qffmpegavaudioformat_p.h
         qffmpegaudiodecoder.cpp qffmpegaudiodecoder_p.h
         qffmpegaudioinput.cpp qffmpegaudioinput_p.h
diff --git a/src/plugins/multimedia/ffmpeg/playbackengine/qffmpegmediadataholder.cpp b/src/plugins/multimedia/ffmpeg/playbackengine/qffmpegmediadataholder.cpp
index 2871b2448..fbb75dd44 100644
--- a/src/plugins/multimedia/ffmpeg/playbackengine/qffmpegmediadataholder.cpp
+++ b/src/plugins/multimedia/ffmpeg/playbackengine/qffmpegmediadataholder.cpp
@@ -5,6 +5,7 @@
 
 #include "qffmpegmediametadata_p.h"
 #include "qffmpegmediaformatinfo_p.h"
+#include "qffmpegioutils_p.h"
 #include "qiodevice.h"
 #include "qdatetime.h"
 #include "qloggingcategory.h"
@@ -108,36 +109,6 @@ static void insertMediaData(QMediaMetaData &metaData, QPlatformMediaPlayer::Trac
     }
 };
 
-static int readQIODevice(void *opaque, uint8_t *buf, int buf_size)
-{
-    auto *dev = static_cast<QIODevice *>(opaque);
-    if (dev->atEnd())
-        return AVERROR_EOF;
-    return dev->read(reinterpret_cast<char *>(buf), buf_size);
-}
-
-static int64_t seekQIODevice(void *opaque, int64_t offset, int whence)
-{
-    QIODevice *dev = static_cast<QIODevice *>(opaque);
-
-    if (dev->isSequential())
-        return AVERROR(EINVAL);
-
-    if (whence & AVSEEK_SIZE)
-        return dev->size();
-
-    whence &= ~AVSEEK_FORCE;
-
-    if (whence == SEEK_CUR)
-        offset += dev->pos();
-    else if (whence == SEEK_END)
-        offset += dev->size();
-
-    if (!dev->seek(offset))
-        return AVERROR(EINVAL);
-    return offset;
-}
-
 QPlatformMediaPlayer::TrackType MediaDataHolder::trackTypeFromMediaType(int mediaType)
 {
     switch (mediaType) {
diff --git a/src/plugins/multimedia/ffmpeg/qffmpegioutils.cpp b/src/plugins/multimedia/ffmpeg/qffmpegioutils.cpp
new file mode 100644
index 000000000..de332e91d
--- /dev/null
+++ b/src/plugins/multimedia/ffmpeg/qffmpegioutils.cpp
@@ -0,0 +1,44 @@
+// Copyright (C) 2024 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qffmpegioutils_p.h"
+#include "qiodevice.h"
+#include "qffmpegdefs_p.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace QFFmpeg {
+
+int readQIODevice(void *opaque, uint8_t *buf, int buf_size)
+{
+    auto *dev = static_cast<QIODevice *>(opaque);
+    if (dev->atEnd())
+        return AVERROR_EOF;
+    return dev->read(reinterpret_cast<char *>(buf), buf_size);
+}
+
+int64_t seekQIODevice(void *opaque, int64_t offset, int whence)
+{
+    QIODevice *dev = static_cast<QIODevice *>(opaque);
+
+    if (dev->isSequential())
+        return AVERROR(EINVAL);
+
+    if (whence & AVSEEK_SIZE)
+        return dev->size();
+
+    whence &= ~AVSEEK_FORCE;
+
+    if (whence == SEEK_CUR)
+        offset += dev->pos();
+    else if (whence == SEEK_END)
+        offset += dev->size();
+
+    if (!dev->seek(offset))
+        return AVERROR(EINVAL);
+    return offset;
+}
+
+} // namespace QFFmpeg
+
+QT_END_NAMESPACE
diff --git a/src/plugins/multimedia/ffmpeg/qffmpegioutils_p.h b/src/plugins/multimedia/ffmpeg/qffmpegioutils_p.h
new file mode 100644
index 000000000..cf3136f39
--- /dev/null
+++ b/src/plugins/multimedia/ffmpeg/qffmpegioutils_p.h
@@ -0,0 +1,32 @@
+// Copyright (C) 2024 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QFFMPEGIOUTILS_P_H
+#define QFFMPEGIOUTILS_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qtmultimediaglobal.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace QFFmpeg {
+
+int readQIODevice(void *opaque, uint8_t *buf, int buf_size);
+
+int64_t seekQIODevice(void *opaque, int64_t offset, int whence);
+
+} // namespace QFFmpeg
+
+QT_END_NAMESPACE
+
+#endif // QFFMPEGIOUTILS_P_H