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/*
* Dolby Vision RPU decoder
*
* Copyright (C) 2021 Jan Ekström
* Copyright (C) 2021 Niklas Haas
*
* 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 AVCODEC_DOVI_RPU_H
#define AVCODEC_DOVI_RPU_H
#include "libavutil/dovi_meta.h"
#include "libavutil/frame.h"
#include "avcodec.h"
#define DOVI_MAX_DM_ID 15
typedef struct DOVIContext {
void *logctx;
/**
* Enable tri-state. For encoding only. FF_DOVI_AUTOMATIC enables Dolby
* Vision only if avctx->decoded_side_data contains an AVDOVIMetadata.
*/
#define FF_DOVI_AUTOMATIC -1
int enable;
/**
* Currently active dolby vision configuration, or {0} for none.
* Set by the user when decoding. Generated by ff_dovi_configure()
* when encoding.
*
* Note: sizeof(cfg) is not part of the libavutil ABI, so users should
* never pass &cfg to any other library calls. This is included merely as
* a way to look up the values of fields known at compile time.
*/
AVDOVIDecoderConfigurationRecord cfg;
/**
* Currently active RPU data header, updates on every ff_dovi_rpu_parse()
* or ff_dovi_rpu_generate().
*/
AVDOVIRpuDataHeader header;
/**
* Currently active data mappings, or NULL. Points into memory owned by the
* corresponding rpu/vdr_ref, which becomes invalid on the next call to
* ff_dovi_rpu_parse() or ff_dovi_rpu_generate().
*/
const AVDOVIDataMapping *mapping;
const AVDOVIColorMetadata *color;
/**
* Currently active extension blocks, updates on every ff_dovi_rpu_parse()
* or ff_dovi_rpu_generate().
*/
AVDOVIDmData *ext_blocks;
int num_ext_blocks;
/**
* Private fields internal to dovi_rpu.c
*/
struct DOVIVdr *vdr[DOVI_MAX_DM_ID+1]; ///< RefStruct references
uint8_t *rpu_buf; ///< temporary buffer
unsigned rpu_buf_sz;
} DOVIContext;
void ff_dovi_ctx_replace(DOVIContext *s, const DOVIContext *s0);
/**
* Completely reset a DOVIContext, preserving only logctx.
*/
void ff_dovi_ctx_unref(DOVIContext *s);
/**
* Partially reset the internal state. Resets per-frame state, but preserves
* the stream-wide configuration record.
*/
void ff_dovi_ctx_flush(DOVIContext *s);
/**
* Parse the contents of a Dovi RPU NAL and update the parsed values in the
* DOVIContext struct.
*
* Returns 0 or an error code.
*
* Note: `DOVIContext.cfg` should be initialized before calling into this
* function. If not done, the profile will be guessed according to HEVC
* semantics.
*/
int ff_dovi_rpu_parse(DOVIContext *s, const uint8_t *rpu, size_t rpu_size,
int err_recognition);
/**
* Attach the decoded AVDOVIMetadata as side data to an AVFrame.
*/
int ff_dovi_attach_side_data(DOVIContext *s, AVFrame *frame);
/**
* Configure the encoder for Dolby Vision encoding. Generates a configuration
* record in s->cfg, and attaches it to avctx->coded_side_data. Sets the correct
* profile and compatibility ID based on the tagged AVCodecContext colorspace
* metadata, and the correct level based on the resolution and tagged framerate.
*
* Returns 0 or a negative error code.
*/
int ff_dovi_configure(DOVIContext *s, AVCodecContext *avctx);
/***************************************************
* The following section is for internal use only. *
***************************************************/
typedef struct DOVIVdr {
AVDOVIDataMapping mapping;
AVDOVIColorMetadata color;
} DOVIVdr;
enum {
RPU_COEFF_FIXED = 0,
RPU_COEFF_FLOAT = 1,
};
/**
* Synthesize a Dolby Vision RPU reflecting the current state. Note that this
* assumes all previous calls to `ff_dovi_rpu_generate` have been appropriately
* signalled, i.e. it will not re-send already transmitted redundant data.
*
* Mutates the internal state of DOVIContext to reflect the change.
* Returns 0 or a negative error code.
*
* This generates a fully formed RPU ready for inclusion in the bitstream,
* including the EMDF header (profile 10) or NAL encapsulation (otherwise).
*/
int ff_dovi_rpu_generate(DOVIContext *s, const AVDOVIMetadata *metadata,
uint8_t **out_rpu, int *out_size);
/**
* Internal helper function to guess the correct DV profile for HEVC.
*
* Returns the profile number or 0 if unknown.
*/
int ff_dovi_guess_profile_hevc(const AVDOVIRpuDataHeader *hdr);
#endif /* AVCODEC_DOVI_RPU_H */
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