2023-06-15 13:46:43 +02:00
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "golomb.h"
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#include "parser.h"
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#include "evc.h"
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#include "evc_parse.h"
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#define NUM_CHROMA_FORMATS 4 // @see ISO_IEC_23094-1 section 6.2 table 2
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static const enum AVPixelFormat pix_fmts_8bit[NUM_CHROMA_FORMATS] = {
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P
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};
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static const enum AVPixelFormat pix_fmts_9bit[NUM_CHROMA_FORMATS] = {
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AV_PIX_FMT_GRAY9, AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9
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};
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static const enum AVPixelFormat pix_fmts_10bit[NUM_CHROMA_FORMATS] = {
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AV_PIX_FMT_GRAY10, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10
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};
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static const enum AVPixelFormat pix_fmts_12bit[NUM_CHROMA_FORMATS] = {
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AV_PIX_FMT_GRAY12, AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12
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};
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static const enum AVPixelFormat pix_fmts_14bit[NUM_CHROMA_FORMATS] = {
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AV_PIX_FMT_GRAY14, AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14
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};
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static const enum AVPixelFormat pix_fmts_16bit[NUM_CHROMA_FORMATS] = {
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AV_PIX_FMT_GRAY16, AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16
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};
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// nuh_temporal_id specifies a temporal identifier for the NAL unit
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int ff_evc_get_temporal_id(const uint8_t *bits, int bits_size, void *logctx)
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{
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int temporal_id = 0;
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uint16_t t = 0;
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if (bits_size < EVC_NALU_HEADER_SIZE) {
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av_log(logctx, AV_LOG_ERROR, "Can't read NAL unit header\n");
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return 0;
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}
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// forbidden_zero_bit
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if ((bits[0] & 0x80) != 0)
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return -1;
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t = AV_RB16(bits);
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temporal_id = (t >> 6) & 0x0007;
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return temporal_id;
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}
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// @see ISO_IEC_23094-1 (7.3.2.6 Slice layer RBSP syntax)
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2023-06-15 16:03:51 +02:00
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static int evc_parse_slice_header(EVCParserContext *ctx, EVCParserSliceHeader *sh, const uint8_t *bs, int bs_size)
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2023-06-15 13:46:43 +02:00
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{
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GetBitContext gb;
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EVCParserPPS *pps;
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EVCParserSPS *sps;
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int num_tiles_in_slice = 0;
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int slice_pic_parameter_set_id;
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int ret;
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2023-06-15 13:46:43 +02:00
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2023-06-15 16:03:51 +02:00
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if ((ret = init_get_bits8(&gb, bs, bs_size)) < 0)
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return ret;
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2023-06-15 13:46:43 +02:00
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slice_pic_parameter_set_id = get_ue_golomb(&gb);
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if (slice_pic_parameter_set_id < 0 || slice_pic_parameter_set_id >= EVC_MAX_PPS_COUNT)
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return AVERROR_INVALIDDATA;
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2023-06-15 13:46:43 +02:00
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2023-06-17 17:37:15 +02:00
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pps = ctx->ps.pps[slice_pic_parameter_set_id];
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2023-06-15 13:46:43 +02:00
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if(!pps)
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2023-06-15 16:03:51 +02:00
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return AVERROR_INVALIDDATA;
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2023-06-15 13:46:43 +02:00
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2023-06-17 17:37:15 +02:00
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sps = ctx->ps.sps[pps->pps_seq_parameter_set_id];
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if(!sps)
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return AVERROR_INVALIDDATA;
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2023-06-15 13:46:43 +02:00
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2023-06-15 16:03:51 +02:00
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memset(sh, 0, sizeof(*sh));
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2023-06-15 13:46:43 +02:00
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sh->slice_pic_parameter_set_id = slice_pic_parameter_set_id;
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if (!pps->single_tile_in_pic_flag) {
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sh->single_tile_in_slice_flag = get_bits(&gb, 1);
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sh->first_tile_id = get_bits(&gb, pps->tile_id_len_minus1 + 1);
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} else
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sh->single_tile_in_slice_flag = 1;
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if (!sh->single_tile_in_slice_flag) {
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if (pps->arbitrary_slice_present_flag)
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sh->arbitrary_slice_flag = get_bits(&gb, 1);
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if (!sh->arbitrary_slice_flag)
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sh->last_tile_id = get_bits(&gb, pps->tile_id_len_minus1 + 1);
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else {
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sh->num_remaining_tiles_in_slice_minus1 = get_ue_golomb(&gb);
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num_tiles_in_slice = sh->num_remaining_tiles_in_slice_minus1 + 2;
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for (int i = 0; i < num_tiles_in_slice - 1; ++i)
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sh->delta_tile_id_minus1[i] = get_ue_golomb(&gb);
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}
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}
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sh->slice_type = get_ue_golomb(&gb);
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if (ctx->nalu_type == EVC_IDR_NUT)
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sh->no_output_of_prior_pics_flag = get_bits(&gb, 1);
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if (sps->sps_mmvd_flag && ((sh->slice_type == EVC_SLICE_TYPE_B) || (sh->slice_type == EVC_SLICE_TYPE_P)))
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sh->mmvd_group_enable_flag = get_bits(&gb, 1);
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else
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sh->mmvd_group_enable_flag = 0;
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if (sps->sps_alf_flag) {
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int ChromaArrayType = sps->chroma_format_idc;
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sh->slice_alf_enabled_flag = get_bits(&gb, 1);
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if (sh->slice_alf_enabled_flag) {
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sh->slice_alf_luma_aps_id = get_bits(&gb, 5);
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sh->slice_alf_map_flag = get_bits(&gb, 1);
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sh->slice_alf_chroma_idc = get_bits(&gb, 2);
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if ((ChromaArrayType == 1 || ChromaArrayType == 2) && sh->slice_alf_chroma_idc > 0)
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sh->slice_alf_chroma_aps_id = get_bits(&gb, 5);
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}
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if (ChromaArrayType == 3) {
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int sliceChromaAlfEnabledFlag = 0;
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int sliceChroma2AlfEnabledFlag = 0;
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if (sh->slice_alf_chroma_idc == 1) { // @see ISO_IEC_23094-1 (7.4.5)
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sliceChromaAlfEnabledFlag = 1;
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sliceChroma2AlfEnabledFlag = 0;
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} else if (sh->slice_alf_chroma_idc == 2) {
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sliceChromaAlfEnabledFlag = 0;
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sliceChroma2AlfEnabledFlag = 1;
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} else if (sh->slice_alf_chroma_idc == 3) {
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sliceChromaAlfEnabledFlag = 1;
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sliceChroma2AlfEnabledFlag = 1;
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} else {
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sliceChromaAlfEnabledFlag = 0;
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sliceChroma2AlfEnabledFlag = 0;
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}
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if (!sh->slice_alf_enabled_flag)
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sh->slice_alf_chroma_idc = get_bits(&gb, 2);
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if (sliceChromaAlfEnabledFlag) {
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sh->slice_alf_chroma_aps_id = get_bits(&gb, 5);
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sh->slice_alf_chroma_map_flag = get_bits(&gb, 1);
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}
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if (sliceChroma2AlfEnabledFlag) {
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sh->slice_alf_chroma2_aps_id = get_bits(&gb, 5);
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sh->slice_alf_chroma2_map_flag = get_bits(&gb, 1);
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}
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}
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}
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if (ctx->nalu_type != EVC_IDR_NUT) {
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if (sps->sps_pocs_flag)
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sh->slice_pic_order_cnt_lsb = get_bits(&gb, sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
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}
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// @note
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// If necessary, add the missing fields to the EVCParserSliceHeader structure
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// and then extend parser implementation
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2023-06-15 16:03:51 +02:00
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return 0;
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2023-06-15 13:46:43 +02:00
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}
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int ff_evc_parse_nal_unit(EVCParserContext *ctx, const uint8_t *buf, int buf_size, void *logctx)
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{
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int nalu_type, nalu_size;
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int tid;
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const uint8_t *data = buf;
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int data_size = buf_size;
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// ctx->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
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ctx->key_frame = -1;
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nalu_size = buf_size;
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if (nalu_size <= 0) {
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av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit size: (%d)\n", nalu_size);
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return AVERROR_INVALIDDATA;
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}
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// @see ISO_IEC_23094-1_2020, 7.4.2.2 NAL unit header semantic (Table 4 - NAL unit type codes and NAL unit type classes)
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// @see enum EVCNALUnitType in evc.h
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nalu_type = evc_get_nalu_type(data, data_size, logctx);
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if (nalu_type < EVC_NOIDR_NUT || nalu_type > EVC_UNSPEC_NUT62) {
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av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit type: (%d)\n", nalu_type);
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return AVERROR_INVALIDDATA;
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}
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ctx->nalu_type = nalu_type;
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tid = ff_evc_get_temporal_id(data, data_size, logctx);
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if (tid < 0) {
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av_log(logctx, AV_LOG_ERROR, "Invalid temporial id: (%d)\n", tid);
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return AVERROR_INVALIDDATA;
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}
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ctx->nuh_temporal_id = tid;
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data += EVC_NALU_HEADER_SIZE;
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data_size -= EVC_NALU_HEADER_SIZE;
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switch(nalu_type) {
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case EVC_SPS_NUT: {
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EVCParserSPS *sps;
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int bit_depth;
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2023-06-17 17:37:15 +02:00
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sps = ff_evc_parse_sps(&ctx->ps, data, nalu_size);
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2023-06-15 13:46:43 +02:00
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if (!sps) {
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av_log(logctx, AV_LOG_ERROR, "SPS parsing error\n");
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return AVERROR_INVALIDDATA;
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}
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ctx->coded_width = sps->pic_width_in_luma_samples;
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ctx->coded_height = sps->pic_height_in_luma_samples;
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if(sps->picture_cropping_flag) {
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ctx->width = sps->pic_width_in_luma_samples - sps->picture_crop_left_offset - sps->picture_crop_right_offset;
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ctx->height = sps->pic_height_in_luma_samples - sps->picture_crop_top_offset - sps->picture_crop_bottom_offset;
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} else {
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ctx->width = sps->pic_width_in_luma_samples;
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ctx->height = sps->pic_height_in_luma_samples;
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}
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if (sps->profile_idc == 1) ctx->profile = FF_PROFILE_EVC_MAIN;
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else ctx->profile = FF_PROFILE_EVC_BASELINE;
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2023-06-15 15:10:14 +02:00
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if (sps->vui_parameters_present_flag && sps->vui_parameters.timing_info_present_flag) {
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int64_t num = sps->vui_parameters.num_units_in_tick;
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int64_t den = sps->vui_parameters.time_scale;
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if (num != 0 && den != 0)
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av_reduce(&ctx->framerate.den, &ctx->framerate.num, num, den, 1 << 30);
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} else
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ctx->framerate = (AVRational) { 0, 1 };
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2023-06-15 13:46:43 +02:00
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bit_depth = sps->bit_depth_chroma_minus8 + 8;
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ctx->format = AV_PIX_FMT_NONE;
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switch (bit_depth) {
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case 8:
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ctx->format = pix_fmts_8bit[sps->chroma_format_idc];
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break;
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case 9:
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ctx->format = pix_fmts_9bit[sps->chroma_format_idc];
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break;
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case 10:
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ctx->format = pix_fmts_10bit[sps->chroma_format_idc];
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break;
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case 12:
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ctx->format = pix_fmts_12bit[sps->chroma_format_idc];
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break;
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case 14:
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ctx->format = pix_fmts_14bit[sps->chroma_format_idc];
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break;
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case 16:
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ctx->format = pix_fmts_16bit[sps->chroma_format_idc];
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break;
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}
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av_assert0(ctx->format != AV_PIX_FMT_NONE);
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break;
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}
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case EVC_PPS_NUT: {
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EVCParserPPS *pps;
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2023-06-17 17:37:15 +02:00
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pps = ff_evc_parse_pps(&ctx->ps, data, nalu_size);
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2023-06-15 13:46:43 +02:00
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if (!pps) {
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av_log(logctx, AV_LOG_ERROR, "PPS parsing error\n");
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return AVERROR_INVALIDDATA;
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}
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break;
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}
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case EVC_SEI_NUT: // Supplemental Enhancement Information
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case EVC_APS_NUT: // Adaptation parameter set
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case EVC_FD_NUT: // Filler data
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break;
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case EVC_IDR_NUT: // Coded slice of a IDR or non-IDR picture
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case EVC_NOIDR_NUT: {
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2023-06-15 16:03:51 +02:00
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EVCParserSliceHeader sh;
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2023-06-15 16:06:14 +02:00
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const EVCParserSPS *sps;
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const EVCParserPPS *pps;
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2023-06-15 16:03:51 +02:00
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int ret;
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ret = evc_parse_slice_header(ctx, &sh, data, nalu_size);
|
|
|
|
if (ret < 0) {
|
2023-06-15 13:46:43 +02:00
|
|
|
av_log(logctx, AV_LOG_ERROR, "Slice header parsing error\n");
|
2023-06-15 16:03:51 +02:00
|
|
|
return ret;
|
2023-06-15 13:46:43 +02:00
|
|
|
}
|
|
|
|
|
2023-06-15 16:03:51 +02:00
|
|
|
switch (sh.slice_type) {
|
2023-06-15 13:46:43 +02:00
|
|
|
case EVC_SLICE_TYPE_B: {
|
|
|
|
ctx->pict_type = AV_PICTURE_TYPE_B;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
case EVC_SLICE_TYPE_P: {
|
|
|
|
ctx->pict_type = AV_PICTURE_TYPE_P;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
case EVC_SLICE_TYPE_I: {
|
|
|
|
ctx->pict_type = AV_PICTURE_TYPE_I;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
default: {
|
|
|
|
ctx->pict_type = AV_PICTURE_TYPE_NONE;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
ctx->key_frame = (nalu_type == EVC_IDR_NUT) ? 1 : 0;
|
|
|
|
|
|
|
|
// POC (picture order count of the current picture) derivation
|
|
|
|
// @see ISO/IEC 23094-1:2020(E) 8.3.1 Decoding process for picture order count
|
2023-06-17 17:37:15 +02:00
|
|
|
pps = ctx->ps.pps[sh.slice_pic_parameter_set_id];
|
|
|
|
sps = ctx->ps.sps[pps->pps_seq_parameter_set_id];
|
2023-06-15 16:06:14 +02:00
|
|
|
av_assert0(sps && pps);
|
2023-06-15 13:46:43 +02:00
|
|
|
|
2023-06-15 16:06:14 +02:00
|
|
|
if (sps->sps_pocs_flag) {
|
2023-06-15 13:46:43 +02:00
|
|
|
|
|
|
|
int PicOrderCntMsb = 0;
|
|
|
|
ctx->poc.prevPicOrderCntVal = ctx->poc.PicOrderCntVal;
|
|
|
|
|
|
|
|
if (nalu_type == EVC_IDR_NUT)
|
|
|
|
PicOrderCntMsb = 0;
|
|
|
|
else {
|
|
|
|
int MaxPicOrderCntLsb = 1 << (sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
|
|
|
|
|
|
|
|
int prevPicOrderCntLsb = ctx->poc.PicOrderCntVal & (MaxPicOrderCntLsb - 1);
|
|
|
|
int prevPicOrderCntMsb = ctx->poc.PicOrderCntVal - prevPicOrderCntLsb;
|
|
|
|
|
|
|
|
|
2023-06-15 16:03:51 +02:00
|
|
|
if ((sh.slice_pic_order_cnt_lsb < prevPicOrderCntLsb) &&
|
|
|
|
((prevPicOrderCntLsb - sh.slice_pic_order_cnt_lsb) >= (MaxPicOrderCntLsb / 2)))
|
2023-06-15 13:46:43 +02:00
|
|
|
|
|
|
|
PicOrderCntMsb = prevPicOrderCntMsb + MaxPicOrderCntLsb;
|
|
|
|
|
2023-06-15 16:03:51 +02:00
|
|
|
else if ((sh.slice_pic_order_cnt_lsb > prevPicOrderCntLsb) &&
|
|
|
|
((sh.slice_pic_order_cnt_lsb - prevPicOrderCntLsb) > (MaxPicOrderCntLsb / 2)))
|
2023-06-15 13:46:43 +02:00
|
|
|
|
|
|
|
PicOrderCntMsb = prevPicOrderCntMsb - MaxPicOrderCntLsb;
|
|
|
|
|
|
|
|
else
|
|
|
|
PicOrderCntMsb = prevPicOrderCntMsb;
|
|
|
|
}
|
2023-06-15 16:03:51 +02:00
|
|
|
ctx->poc.PicOrderCntVal = PicOrderCntMsb + sh.slice_pic_order_cnt_lsb;
|
2023-06-15 13:46:43 +02:00
|
|
|
|
|
|
|
} else {
|
|
|
|
if (nalu_type == EVC_IDR_NUT) {
|
|
|
|
ctx->poc.PicOrderCntVal = 0;
|
|
|
|
ctx->poc.DocOffset = -1;
|
|
|
|
} else {
|
|
|
|
int SubGopLength = (int)pow(2.0, sps->log2_sub_gop_length);
|
|
|
|
if (tid == 0) {
|
|
|
|
ctx->poc.PicOrderCntVal = ctx->poc.prevPicOrderCntVal + SubGopLength;
|
|
|
|
ctx->poc.DocOffset = 0;
|
|
|
|
ctx->poc.prevPicOrderCntVal = ctx->poc.PicOrderCntVal;
|
|
|
|
} else {
|
|
|
|
int ExpectedTemporalId;
|
|
|
|
int PocOffset;
|
|
|
|
int prevDocOffset = ctx->poc.DocOffset;
|
|
|
|
|
|
|
|
ctx->poc.DocOffset = (prevDocOffset + 1) % SubGopLength;
|
|
|
|
if (ctx->poc.DocOffset == 0) {
|
|
|
|
ctx->poc.prevPicOrderCntVal += SubGopLength;
|
|
|
|
ExpectedTemporalId = 0;
|
|
|
|
} else
|
|
|
|
ExpectedTemporalId = 1 + (int)log2(ctx->poc.DocOffset);
|
|
|
|
while (tid != ExpectedTemporalId) {
|
|
|
|
ctx->poc.DocOffset = (ctx->poc.DocOffset + 1) % SubGopLength;
|
|
|
|
if (ctx->poc.DocOffset == 0)
|
|
|
|
ExpectedTemporalId = 0;
|
|
|
|
else
|
|
|
|
ExpectedTemporalId = 1 + (int)log2(ctx->poc.DocOffset);
|
|
|
|
}
|
|
|
|
PocOffset = (int)(SubGopLength * ((2.0 * ctx->poc.DocOffset + 1) / (int)pow(2.0, tid) - 2));
|
|
|
|
ctx->poc.PicOrderCntVal = ctx->poc.prevPicOrderCntVal + PocOffset;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
ctx->output_picture_number = ctx->poc.PicOrderCntVal;
|
|
|
|
ctx->key_frame = (nalu_type == EVC_IDR_NUT) ? 1 : 0;
|
|
|
|
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|