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FFmpeg/libavformat/evc.c
Dawid Kozinski e4da96c6b2 avformat/evc: Small fixes in documentation 
Signed-off-by: Dawid Kozinski <d.kozinski@samsung.com>
2024-05-09 10:06:38 -03:00

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/*
* EVC helper functions for muxers
* Copyright (c) 2022 Dawid Kozinski <d.kozinski@samsung.com>
*
* 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/mem.h"
#include "libavcodec/get_bits.h"
#include "libavcodec/golomb.h"
#include "libavcodec/evc.h"
#include "avio.h"
#include "evc.h"
// @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.1
enum {
SPS_INDEX,
PPS_INDEX,
APS_INDEX,
SEI_INDEX,
NB_ARRAYS
};
// @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
typedef struct EVCNALUnitArray {
uint8_t array_completeness; // when equal to 1 indicates that all NAL units of the given type are in the following array
uint8_t NAL_unit_type; // indicates the type of the NAL units in the following array
uint16_t numNalus; // indicates the number of NAL units of the indicated type
uint16_t *nalUnitLength; // indicates the length in bytes of the NAL unit
uint8_t **nalUnit; // contains an SPS, PPS, APS or a SEI NAL unit, as specified in ISO/IEC 23094-1
} EVCNALUnitArray;
/**
* @brief Specifies the decoder configuration information for ISO/IEC 23094-1 video content.
* @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.2
* Carriage of network abstraction layer (NAL) unit structured video in the ISO base media file format
*/
typedef struct EVCDecoderConfigurationRecord {
uint8_t configurationVersion; // 8 bits
uint8_t profile_idc; // 8 bits
uint8_t level_idc; // 8 bits
uint32_t toolset_idc_h; // 32 bits
uint32_t toolset_idc_l; // 32 bits
uint8_t chroma_format_idc; // 2 bits
uint8_t bit_depth_luma_minus8; // 3 bits
uint8_t bit_depth_chroma_minus8; // 3 bits
uint16_t pic_width_in_luma_samples; // 16 bits
uint16_t pic_height_in_luma_samples; // 16 bits
uint8_t reserved; // 6 bits '000000'b
uint8_t lengthSizeMinusOne; // 2 bits
uint8_t num_of_arrays; // 8 bits
EVCNALUnitArray arrays[NB_ARRAYS];
} EVCDecoderConfigurationRecord;
typedef struct NALU {
int offset;
uint32_t size;
} NALU;
typedef struct NALUList {
NALU *nalus;
unsigned nalus_array_size;
unsigned nb_nalus; ///< valid entries in nalus
} NALUList;
// @see ISO_IEC_23094-1 (7.3.2.1 SPS RBSP syntax)
static int evcc_parse_sps(const uint8_t *bs, int bs_size, EVCDecoderConfigurationRecord *evcc)
{
GetBitContext gb;
unsigned sps_seq_parameter_set_id;
int ret;
bs += EVC_NALU_HEADER_SIZE;
bs_size -= EVC_NALU_HEADER_SIZE;
ret = init_get_bits8(&gb, bs, bs_size);
if (ret < 0)
return ret;
sps_seq_parameter_set_id = get_ue_golomb_long(&gb);
if (sps_seq_parameter_set_id >= EVC_MAX_SPS_COUNT)
return AVERROR_INVALIDDATA;
// the Baseline profile is indicated by profile_idc eqal to 0
// the Main profile is indicated by profile_idc eqal to 1
evcc->profile_idc = get_bits(&gb, 8);
evcc->level_idc = get_bits(&gb, 8);
evcc->toolset_idc_h = get_bits_long(&gb, 32);
evcc->toolset_idc_l = get_bits_long(&gb, 32);
// 0 - monochrome
// 1 - 4:2:0
// 2 - 4:2:2
// 3 - 4:4:4
evcc->chroma_format_idc = get_ue_golomb_long(&gb);
if (evcc->chroma_format_idc > 3)
return AVERROR_INVALIDDATA;
evcc->pic_width_in_luma_samples = get_ue_golomb_long(&gb);
evcc->pic_height_in_luma_samples = get_ue_golomb_long(&gb);
evcc->bit_depth_luma_minus8 = get_ue_golomb_long(&gb);
evcc->bit_depth_chroma_minus8 = get_ue_golomb_long(&gb);
// EVCDecoderConfigurationRecord can't store values > 7. Limit it to bit depth 14.
if (evcc->bit_depth_luma_minus8 > 6 || evcc->bit_depth_chroma_minus8 > 6)
return AVERROR_INVALIDDATA;
return 0;
}
// @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
static int evcc_array_add_nal_unit(const uint8_t *nal_buf, uint32_t nal_size,
uint8_t nal_type, int ps_array_completeness,
EVCNALUnitArray *array)
{
int ret;
uint16_t numNalus = array->numNalus;
ret = av_reallocp_array(&array->nalUnit, numNalus + 1, sizeof(uint8_t *));
if (ret < 0)
return ret;
ret = av_reallocp_array(&array->nalUnitLength, numNalus + 1, sizeof(uint16_t));
if (ret < 0)
return ret;
array->nalUnit [numNalus] = (uint8_t *)nal_buf;
array->nalUnitLength[numNalus] = nal_size;
array->NAL_unit_type = nal_type;
array->numNalus++;
/*
* When the sample entry name is 'evc1', the default and mandatory value of
* array_completeness is 1 for arrays of all types of parameter sets, and 0
* for all other arrays.
*/
if (nal_type == EVC_SPS_NUT || nal_type == EVC_PPS_NUT || nal_type == EVC_APS_NUT)
array->array_completeness = ps_array_completeness;
return 0;
}
static void evcc_init(EVCDecoderConfigurationRecord *evcc)
{
memset(evcc, 0, sizeof(EVCDecoderConfigurationRecord));
evcc->configurationVersion = 1;
evcc->lengthSizeMinusOne = 3; // 4 bytes
}
static void evcc_close(EVCDecoderConfigurationRecord *evcc)
{
for (unsigned i = 0; i < FF_ARRAY_ELEMS(evcc->arrays); i++) {
EVCNALUnitArray *const array = &evcc->arrays[i];
array->numNalus = 0;
av_freep(&array->nalUnit);
av_freep(&array->nalUnitLength);
}
}
static int evcc_write(AVIOContext *pb, EVCDecoderConfigurationRecord *evcc)
{
uint16_t sps_count;
av_log(NULL, AV_LOG_TRACE, "configurationVersion: %"PRIu8"\n",
evcc->configurationVersion);
av_log(NULL, AV_LOG_TRACE, "profile_idc: %"PRIu8"\n",
evcc->profile_idc);
av_log(NULL, AV_LOG_TRACE, "level_idc: %"PRIu8"\n",
evcc->level_idc);
av_log(NULL, AV_LOG_TRACE, "toolset_idc_h: %"PRIu32"\n",
evcc->toolset_idc_h);
av_log(NULL, AV_LOG_TRACE, "toolset_idc_l: %"PRIu32"\n",
evcc->toolset_idc_l);
av_log(NULL, AV_LOG_TRACE, "chroma_format_idc: %"PRIu8"\n",
evcc->chroma_format_idc);
av_log(NULL, AV_LOG_TRACE, "bit_depth_luma_minus8: %"PRIu8"\n",
evcc->bit_depth_luma_minus8);
av_log(NULL, AV_LOG_TRACE, "bit_depth_chroma_minus8: %"PRIu8"\n",
evcc->bit_depth_chroma_minus8);
av_log(NULL, AV_LOG_TRACE, "pic_width_in_luma_samples: %"PRIu16"\n",
evcc->pic_width_in_luma_samples);
av_log(NULL, AV_LOG_TRACE, "pic_height_in_luma_samples: %"PRIu16"\n",
evcc->pic_height_in_luma_samples);
av_log(NULL, AV_LOG_TRACE, "lengthSizeMinusOne: %"PRIu8"\n",
evcc->lengthSizeMinusOne);
av_log(NULL, AV_LOG_TRACE, "num_of_arrays: %"PRIu8"\n",
evcc->num_of_arrays);
for (unsigned i = 0; i < FF_ARRAY_ELEMS(evcc->arrays); i++) {
const EVCNALUnitArray *const array = &evcc->arrays[i];
if(array->numNalus == 0)
continue;
av_log(NULL, AV_LOG_TRACE, "array_completeness[%"PRIu8"]: %"PRIu8"\n",
i, array->array_completeness);
av_log(NULL, AV_LOG_TRACE, "NAL_unit_type[%"PRIu8"]: %"PRIu8"\n",
i, array->NAL_unit_type);
av_log(NULL, AV_LOG_TRACE, "numNalus[%"PRIu8"]: %"PRIu16"\n",
i, array->numNalus);
for ( unsigned j = 0; j < array->numNalus; j++)
av_log(NULL, AV_LOG_TRACE,
"nalUnitLength[%"PRIu8"][%"PRIu16"]: %"PRIu16"\n",
i, j, array->nalUnitLength[j]);
}
/*
* We need at least one SPS.
*/
sps_count = evcc->arrays[SPS_INDEX].numNalus;
if (!sps_count || sps_count > EVC_MAX_SPS_COUNT)
return AVERROR_INVALIDDATA;
/* unsigned int(8) configurationVersion = 1; */
avio_w8(pb, evcc->configurationVersion);
/* unsigned int(8) profile_idc */
avio_w8(pb, evcc->profile_idc);
/* unsigned int(8) level_idc */
avio_w8(pb, evcc->level_idc);
/* unsigned int(32) toolset_idc_h */
avio_wb32(pb, evcc->toolset_idc_h);
/* unsigned int(32) toolset_idc_l */
avio_wb32(pb, evcc->toolset_idc_l);
/*
* unsigned int(2) chroma_format_idc;
* unsigned int(3) bit_depth_luma_minus8;
* unsigned int(3) bit_depth_chroma_minus8;
*/
avio_w8(pb, evcc->chroma_format_idc << 6 |
evcc->bit_depth_luma_minus8 << 3 |
evcc->bit_depth_chroma_minus8);
/* unsigned int(16) pic_width_in_luma_samples; */
avio_wb16(pb, evcc->pic_width_in_luma_samples);
/* unsigned int(16) pic_height_in_luma_samples; */
avio_wb16(pb, evcc->pic_height_in_luma_samples);
/*
* bit(6) reserved = '111111'b;
* unsigned int(2) chromaFormat;
*/
avio_w8(pb, evcc->lengthSizeMinusOne | 0xfc);
/* unsigned int(8) numOfArrays; */
avio_w8(pb, evcc->num_of_arrays);
for (unsigned i = 0; i < FF_ARRAY_ELEMS(evcc->arrays); i++) {
const EVCNALUnitArray *const array = &evcc->arrays[i];
if (!array->numNalus)
continue;
/*
* bit(1) array_completeness;
* unsigned int(1) reserved = 0;
* unsigned int(6) NAL_unit_type;
*/
avio_w8(pb, array->array_completeness << 7 |
array->NAL_unit_type & 0x3f);
/* unsigned int(16) numNalus; */
avio_wb16(pb, array->numNalus);
for (unsigned j = 0; j < array->numNalus; j++) {
/* unsigned int(16) nalUnitLength; */
avio_wb16(pb, array->nalUnitLength[j]);
/* bit(8*nalUnitLength) nalUnit; */
avio_write(pb, array->nalUnit[j],
array->nalUnitLength[j]);
}
}
return 0;
}
int ff_isom_write_evcc(AVIOContext *pb, const uint8_t *data,
int size, int ps_array_completeness)
{
EVCDecoderConfigurationRecord evcc;
int nalu_type;
size_t nalu_size;
int bytes_to_read = size;
unsigned array_index;
int ret = 0;
if (size < 8) {
/* We can't write a valid evcC from the provided data */
return AVERROR_INVALIDDATA;
} else if (*data == 1) {
/* Data is already evcC-formatted */
avio_write(pb, data, size);
return 0;
}
evcc_init(&evcc);
while (bytes_to_read > EVC_NALU_LENGTH_PREFIX_SIZE) {
nalu_size = evc_read_nal_unit_length(data, EVC_NALU_LENGTH_PREFIX_SIZE);
if (nalu_size == 0) break;
data += EVC_NALU_LENGTH_PREFIX_SIZE;
bytes_to_read -= EVC_NALU_LENGTH_PREFIX_SIZE;
if (bytes_to_read < nalu_size) break;
nalu_type = evc_get_nalu_type(data, bytes_to_read);
if (nalu_type < EVC_NOIDR_NUT || nalu_type > EVC_UNSPEC_NUT62) {
ret = AVERROR_INVALIDDATA;
goto end;
}
// @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
// NAL_unit_type indicates the type of the NAL units in the following array (which shall be all of that type);
// - it takes a value as defined in ISO/IEC 23094-1;
// - it is restricted to take one of the values indicating a SPS, PPS, APS, or SEI NAL unit.
switch (nalu_type) {
case EVC_SPS_NUT:
array_index = SPS_INDEX;
break;
case EVC_PPS_NUT:
array_index = PPS_INDEX;
break;
case EVC_APS_NUT:
array_index = APS_INDEX;
break;
case EVC_SEI_NUT:
array_index = SEI_INDEX;
break;
default:
array_index = -1;
break;
}
if( (array_index == SPS_INDEX) ||
(array_index == PPS_INDEX) ||
(array_index == APS_INDEX) ||
(array_index == SEI_INDEX) ) {
ret = evcc_array_add_nal_unit(data, nalu_size, nalu_type, ps_array_completeness, &(evcc.arrays[array_index]));
if (ret < 0)
goto end;
if (evcc.arrays[array_index].numNalus == 1)
evcc.num_of_arrays++;
if(nalu_type == EVC_SPS_NUT) {
ret = evcc_parse_sps(data, nalu_size, &evcc);
if (ret < 0)
goto end;
}
}
data += nalu_size;
bytes_to_read -= nalu_size;
}
ret = evcc_write(pb, &evcc);
end:
evcc_close(&evcc);
return ret;
}
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