| /* |
| * 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 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[%u]: %"PRIu8"\n", |
| i, array->array_completeness); |
| av_log(NULL, AV_LOG_TRACE, "NAL_unit_type[%u]: %"PRIu8"\n", |
| i, array->NAL_unit_type); |
| av_log(NULL, AV_LOG_TRACE, "numNalus[%u]: %"PRIu16"\n", |
| i, array->numNalus); |
| for ( unsigned j = 0; j < array->numNalus; j++) |
| av_log(NULL, AV_LOG_TRACE, |
| "nalUnitLength[%u][%u]: %"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); |
| |
| /* |
| * unsigned int(6) reserved = '000000'b; |
| * unsigned int(2) lengthSizeMinusOne; |
| */ |
| avio_w8(pb, evcc->lengthSizeMinusOne & 0x3); |
| |
| /* 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; |
| } |
