/* * EVC helper functions for muxers * Copyright (c) 2022 Dawid Kozinski * * 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/intreadwrite.h" #include "libavcodec/get_bits.h" #include "libavcodec/golomb.h" #include "libavcodec/evc.h" #include "avformat.h" #include "avio.h" #include "evc.h" #include "avio_internal.h" // The length field that indicates the length in bytes of the following NAL unit is configured to be of 4 bytes #define EVC_NALU_LENGTH_PREFIX_SIZE (4) /* byte */ #define EVC_NALU_HEADER_SIZE (2) /* byte */ // @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; bs += EVC_NALU_HEADER_SIZE; bs_size -= EVC_NALU_HEADER_SIZE; if (init_get_bits8(&gb, bs, bs_size) < 0) return 0; sps_seq_parameter_set_id = get_ue_golomb_31(&gb); if (sps_seq_parameter_set_id >= EVC_MAX_SPS_COUNT) return 0; // 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_31(&gb); 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_31(&gb); evcc->bit_depth_chroma_minus8 = get_ue_golomb_31(&gb); 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) profile_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_width_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; }