On Fri, Jul 21, 2023 at 9:38 AM J. Dekker <j...@itanimul.li> wrote:
>
> Add sidedata for passing basic Error Concealment information helpful to
> a renderer or end user attempting to filter or conceal video decoding
> errors and artifacts.
>
> Co-Authored-By: Thomas Guillem <tho...@gllm.fr>
> Signed-off-by: J. Dekker <j...@itanimul.li>
> ---
> libavutil/Makefile | 2 ++
> libavutil/ec.c | 42 +++++++++++++++++++++++++++++
> libavutil/ec.h | 66 +++++++++++++++++++++++++++++++++++++++++++++
> libavutil/frame.c | 1 +
> libavutil/frame.h | 6 +++++
> libavutil/version.h | 2 +-
> 6 files changed, 118 insertions(+), 1 deletion(-)
> create mode 100644 libavutil/ec.c
> create mode 100644 libavutil/ec.h
>
> diff --git a/libavutil/Makefile b/libavutil/Makefile
> index bd9c6f9e32..81b6b1fb8a 100644
> --- a/libavutil/Makefile
> +++ b/libavutil/Makefile
> @@ -28,6 +28,7 @@ HEADERS = adler32.h
> \
> display.h \
> dovi_meta.h \
> downmix_info.h \
> + ec.h \
> encryption_info.h \
> error.h \
> eval.h \
> @@ -124,6 +125,7 @@ OBJS = adler32.o
> \
> dovi_meta.o \
> downmix_info.o \
> encryption_info.o \
> + ec.o \
> error.o \
> eval.o \
> fifo.o \
> diff --git a/libavutil/ec.c b/libavutil/ec.c
> new file mode 100644
> index 0000000000..762accd0a6
> --- /dev/null
> +++ b/libavutil/ec.c
> @@ -0,0 +1,42 @@
> +/*
> + * 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"
> +#include "ec.h"
> +
> +AVECInfo *av_eci_create_side_data(AVFrame *f)
> +{
> + AVBufferRef *buf = NULL;
> + AVECInfo *eci = av_mallocz(sizeof(AVECInfo));
> +
> + if (!eci)
> + return NULL;
> +
> + buf = av_buffer_create((uint8_t *)eci, sizeof(AVECInfo), NULL, NULL, 0);
> + if (!buf) {
> + av_freep(&eci);
> + return NULL;
> + }
> +
> + if (!av_frame_new_side_data_from_buf(f, AV_FRAME_DATA_EC_INFO, buf)) {
> + av_buffer_unref(&buf);
> + return NULL;
> + }
> +
> + return eci;
> +}
> diff --git a/libavutil/ec.h b/libavutil/ec.h
> new file mode 100644
> index 0000000000..439fe876a2
> --- /dev/null
> +++ b/libavutil/ec.h
> @@ -0,0 +1,66 @@
> +/*
> + * 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_EC_H
> +#define AVUTIL_EC_H
> +
> +#include <stdbool.h>
> +#include <stddef.h>
> +#include <stdint.h>
> +
> +#include "libavutil/mem.h"
> +#include "libavutil/frame.h"
> +
> +/**
> + * Error Concealment information helpful to a renderer or end user
> + * attempting to filter or conceal video decoding errors and artifacts.
> + */
> +typedef struct AVECInfo {
> + /**
> + * Integer estimating how many pixels of the video frame had decoding
> + * errors.
> + */
> + uint64_t error;
> + /**
> + * Integer estimating how many pixels of the video frame decoded
> + * without error.
> + */
> + uint64_t ok;
> + /**
> + * Integer estimating how many pixels of the video frame's reference
> + * frames had decoding errors.
> + */
> + uint64_t ref_error;
> + /**
> + * Integer estimating how many pixels of the video frame's reference
> + * frames decoded without error.
> + */
> + uint64_t ref_ok;
> +} AVECInfo;
> +
> +static inline void av_eci_reset(AVECInfo *info)
> +{
> + info->error = info->ok = info->ref_error = info->ref_ok = 0;
> +}
> +
> +/**
> + * Creates AVECInfo in a specified frame as side data.
> + */
> +AVECInfo *av_eci_create_side_data(AVFrame *f);
> +
> +#endif /* AVUTIL_EC_H */
> diff --git a/libavutil/frame.c b/libavutil/frame.c
> index b6cee2d886..30a838bf22 100644
> --- a/libavutil/frame.c
> +++ b/libavutil/frame.c
> @@ -960,6 +960,7 @@ const char *av_frame_side_data_name(enum
> AVFrameSideDataType type)
> case AV_FRAME_DATA_DOVI_RPU_BUFFER: return "Dolby Vision RPU
> Data";
> case AV_FRAME_DATA_DOVI_METADATA: return "Dolby Vision
> Metadata";
> case AV_FRAME_DATA_AMBIENT_VIEWING_ENVIRONMENT: return "Ambient viewing
> environment";
> + case AV_FRAME_DATA_EC_INFO: return "Error Concealment Information";
> }
> return NULL;
> }
> diff --git a/libavutil/frame.h b/libavutil/frame.h
> index a491315f25..08c6b96d29 100644
> --- a/libavutil/frame.h
> +++ b/libavutil/frame.h
> @@ -214,6 +214,12 @@ enum AVFrameSideDataType {
> * Ambient viewing environment metadata, as defined by H.274.
> */
> AV_FRAME_DATA_AMBIENT_VIEWING_ENVIRONMENT,
> + /**
> + * Error Concealment Information helpful to a renderer attempting to
> filter
> + * or conceal video decoding errors and artifacts. See AVECInfo defined
> in
> + * libavutil/error.h.
> + */
> + AV_FRAME_DATA_EC_INFO,
> };
>
> enum AVActiveFormatDescription {
> diff --git a/libavutil/version.h b/libavutil/version.h
> index 24af520e08..9e798b0e3f 100644
> --- a/libavutil/version.h
> +++ b/libavutil/version.h
> @@ -79,7 +79,7 @@
> */
>
> #define LIBAVUTIL_VERSION_MAJOR 58
> -#define LIBAVUTIL_VERSION_MINOR 14
> +#define LIBAVUTIL_VERSION_MINOR 15
> #define LIBAVUTIL_VERSION_MICRO 100
>
> #define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
> --
> 2.41.0
>
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>
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Hi J,
I appreciate the value of stats so I can tell that the stream had
errors, but how is this side data "helpful to a renderer attempting to
filter or conceal video decoding errors and artifacts" if there is no
information relating to the region of the picture where the errors are
present? Is the assumption that an application will simply have some
threshold at which it decides to duplicate the previous frame rather
than showing the current one?
Thanks,
Devin
--
Devin Heitmueller, Senior Software Engineer
LTN Global Communications
o: +1 (301) 363-1001
w: https://ltnglobal.com e: devin.heitmuel...@ltnglobal.com
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