[FFmpeg-devel] libavutil: AVEncodeInfo data structures and AV_FRAME_DATA_ENCODE_INFO AVFrameSideDataType

Submitted by =?UTF-8?q?Juan=20De=20Le=C3=B3n?= on Aug. 9, 2019, 5:15 p.m.

Details

Message ID 20190809171513.75481-1-juandl@google.com
State New
Headers show

Commit Message

=?UTF-8?q?Juan=20De=20Le=C3=B3n?= Aug. 9, 2019, 5:15 p.m.
AVEncodeInfoFrame data structure to store as AVFrameSideData of type AV_FRAME_DATA_ENCODE_INFO.
The structure stores quantization index for each plane, DC/AC deltas for luma and chroma planes, and an array of AVEncodeInfoBlock struct denoting position, size, and delta quantizer for each block in the frame.
Can be extended to support extraction of other block information.

Signed-off-by: Juan De León <juandl@google.com>
---
 libavutil/Makefile      |  2 +
 libavutil/encode_info.c | 67 +++++++++++++++++++++++++++++++
 libavutil/encode_info.h | 87 +++++++++++++++++++++++++++++++++++++++++
 libavutil/frame.c       |  1 +
 libavutil/frame.h       |  7 ++++
 5 files changed, 164 insertions(+)
 create mode 100644 libavutil/encode_info.c
 create mode 100644 libavutil/encode_info.h

Patch hide | download patch | download mbox

diff --git a/libavutil/Makefile b/libavutil/Makefile
index 57e6e3d7e8..37cfb099e9 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -24,6 +24,7 @@  HEADERS = adler32.h                                                     \
           dict.h                                                        \
           display.h                                                     \
           downmix_info.h                                                \
+          encode_info.h                                                 \
           encryption_info.h                                             \
           error.h                                                       \
           eval.h                                                        \
@@ -111,6 +112,7 @@  OBJS = adler32.o                                                        \
        dict.o                                                           \
        display.o                                                        \
        downmix_info.o                                                   \
+       encode_info.o                                                    \
        encryption_info.o                                                \
        error.o                                                          \
        eval.o                                                           \
diff --git a/libavutil/encode_info.c b/libavutil/encode_info.c
new file mode 100644
index 0000000000..68c30af4d7
--- /dev/null
+++ b/libavutil/encode_info.c
@@ -0,0 +1,67 @@ 
+/*
+ * 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 "libavutil/encode_info.h"
+#include "libavutil/mem.h"
+
+static int init_encode_info_data(AVEncodeInfoFrame *ptr, int nb_blocks) {
+    ptr->nb_blocks = nb_blocks;
+    ptr->dc_q = ptr->ac_q = -1;
+    ptr->dc_chroma_q = ptr->ac_chroma_q = -1;
+
+    for(int i=0;i<AV_NUM_DATA_POINTERS;i++)
+        ptr->plane_q[i] = -1;
+
+    return 0;
+}
+
+AVEncodeInfoFrame *av_encode_info_alloc(int nb_blocks)
+{
+    AVEncodeInfoFrame *ptr;
+    size_t size = sizeof(AVEncodeInfoFrame) + sizeof(AVEncodeInfoBlock)*nb_blocks;
+
+    if (nb_blocks < 0 || size >= INT_MAX)
+        return NULL;
+
+    ptr = av_mallocz(size);
+    if (!ptr)
+        return NULL;
+
+    init_encode_info_data(ptr, nb_blocks);
+
+    return ptr;
+}
+
+AVEncodeInfoFrame *av_encode_info_create_side_data(AVFrame *frame, int nb_blocks)
+{
+    size_t size = sizeof(AVEncodeInfoFrame) + sizeof(AVEncodeInfoBlock)*nb_blocks;
+
+    if (nb_blocks < 0 || size >= INT_MAX)
+        return NULL;
+
+    AVFrameSideData *sd = av_frame_new_side_data(frame,
+                                                 AV_FRAME_DATA_ENCODE_INFO,
+                                                 size);
+    if (!sd)
+        return NULL;
+
+    memset(sd->data, 0, size);
+    init_encode_info_data((AVEncodeInfoFrame*)sd->data, nb_blocks);
+
+    return (AVEncodeInfoFrame*)sd->data;
+}
diff --git a/libavutil/encode_info.h b/libavutil/encode_info.h
new file mode 100644
index 0000000000..cbe8be2891
--- /dev/null
+++ b/libavutil/encode_info.h
@@ -0,0 +1,87 @@ 
+/*
+ * 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 AVUTIL_ENCODE_INFO_H
+#define AVUTIL_ENCODE_INFO_H
+
+#include "libavutil/frame.h"
+
+/**
+ * Data structure for extracting block data stored in an array in AVEncodeInfoFrame
+ */
+typedef struct AVEncodeInfoBlock{
+    /**
+     * Distance in luma pixels from the top-left corner of the visible frame
+     * to the top-left corner of the block.
+     * Can be negative if top/right padding is present on the coded frame.
+     */
+    int src_x, src_y;
+    /**
+     * Width and height of the block in luma pixels
+     */
+    int w, h;
+    /**
+     * Delta quantization index for the block
+     */
+    int delta_q;
+
+    uint8_t reserved[128];
+} AVEncodeInfoBlock;
+
+/**
+ * Frame encoding info, used as AVFrameSideData
+ */
+typedef struct AVEncodeInfoFrame {
+    /**
+     * Number of blocks in the array
+     */
+    int nb_blocks;
+    /**
+     * Base plane quantizer for the frame, set to -1 when value is unsupported
+     */
+    int plane_q[AV_NUM_DATA_POINTERS];
+    /**
+     * DC/AC quantizer index delta, set to -1 when value is value unsupported.
+     */
+    int ac_q, dc_q;
+    /**
+     * DC/AC chroma quantizer index delta, set to -1 when value is value unsupported.
+     */
+    int ac_chroma_q, dc_chroma_q;
+
+    uint8_t reserved[256];
+
+    AVEncodeInfoBlock blocks[];
+} AVEncodeInfoFrame;
+
+/**
+ * Allocates memory for AVEncodeInfoFrame plus an array of
+ * {@code nb_blocks} AVEncodeInfoBlock and initializes the variables.
+ * Can be freed with a normal av_free() call.
+ */
+AVEncodeInfoFrame *av_encode_info_alloc(int nb_blocks);
+
+/**
+ * Allocates memory for AVEncodeInfoFrame plus an array of
+ * {@code nb_blocks} AVEncodeInfoBlock in the given AVFrame {@code frame}
+ * as AVFrameSideData of type AV_FRAME_DATA_ENCODE_INFO
+ * and initializes the variables
+ */
+AVEncodeInfoFrame *av_encode_info_create_side_data(AVFrame *frame, int nb_blocks);
+
+#endif /* AVUTIL_ENCODE_INFO_H */
diff --git a/libavutil/frame.c b/libavutil/frame.c
index dcf1fc3d17..c5ec6d13ca 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -842,6 +842,7 @@  const char *av_frame_side_data_name(enum AVFrameSideDataType type)
 #endif
     case AV_FRAME_DATA_DYNAMIC_HDR_PLUS: return "HDR Dynamic Metadata SMPTE2094-40 (HDR10+)";
     case AV_FRAME_DATA_REGIONS_OF_INTEREST: return "Regions Of Interest";
+    case AV_FRAME_DATA_ENCODE_INFO:                  return "AVEncodeInfo";
     }
     return NULL;
 }
diff --git a/libavutil/frame.h b/libavutil/frame.h
index 5d3231e7bb..c2436278a7 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -179,6 +179,13 @@  enum AVFrameSideDataType {
      * array element is implied by AVFrameSideData.size / AVRegionOfInterest.self_size.
      */
     AV_FRAME_DATA_REGIONS_OF_INTEREST,
+    /**
+     * Extract block data from supported decoders. The data is stored in
+     * AVEncodeInfo type, which contains an array of AVBlockData
+     * described in libavuitls/encode_info.h
+     * Can be allocated in the frame directly with av_encode_info_create_side_data().
+     */
+    AV_FRAME_DATA_ENCODE_INFO,
 };
 
 enum AVActiveFormatDescription {