Re: [FFmpeg-devel] [PATCH v10 1/5] avformat/dovi_isom: Implement Dolby Vision configuration parsing/writing

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

quietvoid:
> Both parse/write implementations are based on mov/movenc.
> 
> This only adds support for the "Dolby Vision configuration box".
> Other configuration boxes, such as
> "Dolby Vision enhancement layer configuration box" are not supported.
> 
> The new functions will be used to implement parsing/writing the DOVI config
> for Matroska, as well as to refactor both mov/movenc to use dovi_isom functions.
> 
> Signed-off-by: quietvoid <tcChlisop0@gmail.com>
> ---
>  libavformat/dovi_isom.c | 118 ++++++++++++++++++++++++++++++++++++++++
>  libavformat/dovi_isom.h |  35 ++++++++++++
>  2 files changed, 153 insertions(+)
>  create mode 100644 libavformat/dovi_isom.c
>  create mode 100644 libavformat/dovi_isom.h
> 
> diff --git a/libavformat/dovi_isom.c b/libavformat/dovi_isom.c
> new file mode 100644
> index 0000000000..262d7e37ba
> --- /dev/null
> +++ b/libavformat/dovi_isom.c
> @@ -0,0 +1,118 @@
> +/*
> + * DOVI ISO Media common code
> + *
> + * Copyright (c) 2020 Vacing Fang <vacingfang@tencent.com>
> + * Copyright (c) 2021 quietvoid
> + *
> + * 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/dovi_meta.h"
> +
> +#include "libavcodec/put_bits.h"
> +
> +#include "avformat.h"
> +#include "dovi_isom.h"
> +
> +int ff_isom_parse_dvcc_dvvc(AVFormatContext *s, AVStream *st, const uint8_t *buf_ptr, uint64_t size)
> +{
> +    uint32_t buf;
> +    AVDOVIDecoderConfigurationRecord *dovi;
> +    size_t dovi_size;
> +    int ret;
> +
> +    if (size > (1 << 30) || size < 4)
> +        return AVERROR_INVALIDDATA;
> +
> +    dovi = av_dovi_alloc(&dovi_size);
> +    if (!dovi)
> +        return AVERROR(ENOMEM);
> +
> +    dovi->dv_version_major = *buf_ptr++;    // 8 bits
> +    dovi->dv_version_minor = *buf_ptr++;    // 8 bits
> +
> +    buf = *buf_ptr++ << 8;
> +    buf |= *buf_ptr++;
> +
> +    dovi->dv_profile        = (buf >> 9) & 0x7f;    // 7 bits
> +    dovi->dv_level          = (buf >> 3) & 0x3f;    // 6 bits
> +    dovi->rpu_present_flag  = (buf >> 2) & 0x01;    // 1 bit
> +    dovi->el_present_flag   = (buf >> 1) & 0x01;    // 1 bit
> +    dovi->bl_present_flag   =  buf       & 0x01;    // 1 bit
> +
> +    // Has enough remaining data
> +    if (size >= 5) {
> +        dovi->dv_bl_signal_compatibility_id = ((*buf_ptr++) >> 4) & 0x0f; // 4 bits
> +    } else {
> +        // 0 stands for None
> +        // Dolby Vision V1.2.93 profiles and levels
> +        dovi->dv_bl_signal_compatibility_id = 0;
> +    }
> +
> +    ret = av_stream_add_side_data(st, AV_PKT_DATA_DOVI_CONF,
> +                                  (uint8_t *)dovi, dovi_size);
> +    if (ret < 0) {
> +        av_free(dovi);
> +        return ret;
> +    }
> +
> +    av_log(s, AV_LOG_TRACE, "DOVI in dvcC/dvvC/dvwC box, version: %d.%d, profile: %d, level: %d, "
> +           "rpu flag: %d, el flag: %d, bl flag: %d, compatibility id: %d\n",
> +           dovi->dv_version_major, dovi->dv_version_minor,
> +           dovi->dv_profile, dovi->dv_level,
> +           dovi->rpu_present_flag,
> +           dovi->el_present_flag,
> +           dovi->bl_present_flag,
> +           dovi->dv_bl_signal_compatibility_id);
> +
> +    return 0;
> +}
> +
> +void ff_isom_put_dvcc_dvvc(AVFormatContext *s, uint8_t out[ISOM_DVCC_DVVC_SIZE],
> +                           AVDOVIDecoderConfigurationRecord *dovi)
> +{
> +    PutBitContext pb;
> +
> +    init_put_bits(&pb, out, ISOM_DVCC_DVVC_SIZE);
> +
> +    put_bits(&pb, 8, dovi->dv_version_major);
> +    put_bits(&pb, 8, dovi->dv_version_minor);
> +    put_bits(&pb, 7, dovi->dv_profile);
> +    put_bits(&pb, 6, dovi->dv_level);
> +    put_bits(&pb, 1, dovi->rpu_present_flag);
> +    put_bits(&pb, 1, dovi->el_present_flag);
> +    put_bits(&pb, 1, dovi->bl_present_flag);
> +    put_bits(&pb, 4, dovi->dv_bl_signal_compatibility_id);

There is a slight problem with the last six values: They come from the
user and therefore must not be trusted to be within the range they are
supposed to be. (The put_bits API uses an av_assert2 to check that
the values to be written actually fit into the amount of bits that is
used to write them.) So I suggest you use !! for the flags and
appropriate masks for dv_profile, dv_level and
dv_bl_signal_compatibility_id.

> +
> +    put_bits(&pb, 28, 0); /* reserved */
> +    put_bits32(&pb, 0); /* reserved */
> +    put_bits32(&pb, 0); /* reserved */
> +    put_bits32(&pb, 0); /* reserved */
> +    put_bits32(&pb, 0); /* reserved */
> +
> +    flush_put_bits(&pb);
> +
> +    av_log(s, AV_LOG_DEBUG, "DOVI in %s box, version: %d.%d, profile: %d, level: %d, "
> +           "rpu flag: %d, el flag: %d, bl flag: %d, compatibility id: %d\n",
> +           dovi->dv_profile > 10 ? "dvwC" : (dovi->dv_profile > 7 ? "dvvC" : "dvcC"),
> +           dovi->dv_version_major, dovi->dv_version_minor,
> +           dovi->dv_profile, dovi->dv_level,
> +           dovi->rpu_present_flag,
> +           dovi->el_present_flag,
> +           dovi->bl_present_flag,
> +           dovi->dv_bl_signal_compatibility_id);
> +}
> diff --git a/libavformat/dovi_isom.h b/libavformat/dovi_isom.h
> new file mode 100644
> index 0000000000..1526164319
> --- /dev/null
> +++ b/libavformat/dovi_isom.h
> @@ -0,0 +1,35 @@
> +/*
> + * DOVI ISO Media common code
> + * Copyright (c) 2021 quietvoid
> + *
> + * 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 AVFORMAT_DOVI_ISOM_H
> +#define AVFORMAT_DOVI_ISOM_H
> +
> +#include "libavutil/dovi_meta.h"
> +
> +#include "avformat.h"
> +
> +#define ISOM_DVCC_DVVC_SIZE 24
> +
> +int ff_isom_parse_dvcc_dvvc(AVFormatContext *s, AVStream *st, const uint8_t *buf_ptr, uint64_t size);
> +void ff_isom_put_dvcc_dvvc(AVFormatContext *s, uint8_t out[ISOM_DVCC_DVVC_SIZE],
> +                           AVDOVIDecoderConfigurationRecord *dovi);
> +
> +#endif /* AVFORMAT_DOVI_ISOM_H */
> 

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