[FFmpeg-devel] [PATCH 1/3] lavu/frame: add av_frame_get_buffer2

["Xiang, Haihao" <haihao.xiang-at-intel.com@ffmpeg.org>]

From: Haihao Xiang <haihao.xiang@intel.com>

Intel MediaSDK and oneVPL expect continuous allocation for data[i],
however there are mandatory padding bytes between data[i] and data[i+1].
when calling av_frame_get_buffer. So adding av_frame_get_buffer2 to
allow caller to specify the length of padding bytes.

Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>
---
 doc/APIchanges      |  3 +++
 libavutil/frame.c   | 12 ++++++++----
 libavutil/frame.h   | 31 +++++++++++++++++++++++++++++++
 libavutil/version.h |  2 +-
 4 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/doc/APIchanges b/doc/APIchanges
index 20ab4709e7..6a2c3b6270 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2023-02-09
 
 API changes, most recent first:
 
+2023-05-09 - xxxxxxxxxx - lavu 58.8.100 - frame.h
+  Add av_frame_get_buffer2
+
 2023-05-xx - xxxxxxxxxx - lavc 60.11.100 - codec_par.h
   Add AVCodecParameters.framerate.
 
diff --git a/libavutil/frame.c b/libavutil/frame.c
index 97d40208c8..5c9e740c6b 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -106,11 +106,10 @@ void av_frame_free(AVFrame **frame)
     av_freep(frame);
 }
 
-static int get_video_buffer(AVFrame *frame, int align)
+static int get_video_buffer(AVFrame *frame, int align, int plane_padding)
 {
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
     int ret, padded_height, total_size;
-    int plane_padding = FFMAX(16 + 16/*STRIDE_ALIGN*/, align);
     ptrdiff_t linesizes[4];
     size_t sizes[4];
 
@@ -240,14 +239,14 @@ FF_ENABLE_DEPRECATION_WARNINGS
 
 }
 
-int av_frame_get_buffer(AVFrame *frame, int align)
+int av_frame_get_buffer2(AVFrame *frame, int align, int plane_padding)
 {
     if (frame->format < 0)
         return AVERROR(EINVAL);
 
 FF_DISABLE_DEPRECATION_WARNINGS
     if (frame->width > 0 && frame->height > 0)
-        return get_video_buffer(frame, align);
+        return get_video_buffer(frame, align, plane_padding);
     else if (frame->nb_samples > 0 &&
              (av_channel_layout_check(&frame->ch_layout)
 #if FF_API_OLD_CHANNEL_LAYOUT
@@ -260,6 +259,11 @@ FF_ENABLE_DEPRECATION_WARNINGS
     return AVERROR(EINVAL);
 }
 
+int av_frame_get_buffer(AVFrame *frame, int align)
+{
+    return av_frame_get_buffer2(frame, align, FFMAX(16 + 16/*STRIDE_ALIGN*/, align));
+}
+
 static int frame_copy_props(AVFrame *dst, const AVFrame *src, int force_copy)
 {
     int ret;
diff --git a/libavutil/frame.h b/libavutil/frame.h
index f2b56beebb..197bcfeef2 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -867,6 +867,37 @@ void av_frame_move_ref(AVFrame *dst, AVFrame *src);
  */
 int av_frame_get_buffer(AVFrame *frame, int align);
 
+/**
+ * Allocate new buffer(s) for audio or video data.
+ *
+ * The following fields must be set on frame before calling this function:
+ * - format (pixel format for video, sample format for audio)
+ * - width and height for video
+ * - nb_samples and ch_layout for audio
+ *
+ * This function will fill AVFrame.data and AVFrame.buf arrays and, if
+ * necessary, allocate and fill AVFrame.extended_data and AVFrame.extended_buf.
+ * For planar formats, one buffer will be allocated for each plane.
+ *
+ * @warning: if frame already has been allocated, calling this function will
+ *           leak memory. In addition, undefined behavior can occur in certain
+ *           cases.
+ *
+ * @param frame frame in which to store the new buffers.
+ * @param align Required buffer size alignment. If equal to 0, alignment will be
+ *              chosen automatically for the current CPU. It is highly
+ *              recommended to pass 0 here unless you know what you are doing.
+ * @param plane_padding The length of padding bytes between two video planes. It is
+ *              ignored for audio data.
+ *
+ * @return 0 on success, a negative AVERROR on error.
+ *
+ * @note It is recommended that you use av_frame_get_buffer instead if you do not
+ *       care about the length of padding bytes.
+ * @see av_frame_get_buffer()
+ */
+int av_frame_get_buffer2(AVFrame *frame, int align, int plane_padding);
+
 /**
  * Check if the frame data is writable.
  *
diff --git a/libavutil/version.h b/libavutil/version.h
index 341bcbf188..a4177aa137 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -79,7 +79,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  58
-#define LIBAVUTIL_VERSION_MINOR   7
+#define LIBAVUTIL_VERSION_MINOR   8
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
-- 
2.34.1

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