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92 lines
3.6 KiB
92 lines
3.6 KiB
2 years ago
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/*
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* Common H.264/HEVC VUI Parameter decoding
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*
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (C) 2012 - 2013 Guillaume Martres
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* Copyright (C) 2012 - 2013 Mickael Raulet
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* Copyright (C) 2012 - 2013 Gildas Cocherel
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* Copyright (C) 2013 Vittorio Giovara
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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 "libavutil/log.h"
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#include "libavutil/pixdesc.h"
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#include "get_bits.h"
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#include "golomb.h"
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#include "h2645data.h"
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#include "h2645_vui.h"
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#define EXTENDED_SAR 255
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void ff_h2645_decode_common_vui_params(GetBitContext *gb, H2645VUI *vui, void *logctx)
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{
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int aspect_ratio_info_present_flag;
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av_log(logctx, AV_LOG_DEBUG, "Decoding VUI\n");
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aspect_ratio_info_present_flag = get_bits1(gb);
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if (aspect_ratio_info_present_flag) {
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uint8_t aspect_ratio_idc = get_bits(gb, 8);
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if (aspect_ratio_idc < FF_ARRAY_ELEMS(ff_h2645_pixel_aspect))
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vui->sar = ff_h2645_pixel_aspect[aspect_ratio_idc];
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else if (aspect_ratio_idc == EXTENDED_SAR) {
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vui->sar.num = get_bits(gb, 16);
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vui->sar.den = get_bits(gb, 16);
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} else
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av_log(logctx, AV_LOG_WARNING,
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"Unknown SAR index: %u.\n", aspect_ratio_idc);
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} else
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vui->sar = (AVRational){ 0, 1 };
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vui->overscan_info_present_flag = get_bits1(gb);
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if (vui->overscan_info_present_flag)
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vui->overscan_appropriate_flag = get_bits1(gb);
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vui->video_signal_type_present_flag = get_bits1(gb);
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if (vui->video_signal_type_present_flag) {
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vui->video_format = get_bits(gb, 3);
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vui->video_full_range_flag = get_bits1(gb);
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vui->colour_description_present_flag = get_bits1(gb);
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if (vui->colour_description_present_flag) {
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vui->colour_primaries = get_bits(gb, 8);
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vui->transfer_characteristics = get_bits(gb, 8);
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vui->matrix_coeffs = get_bits(gb, 8);
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// Set invalid values to "unspecified"
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if (!av_color_primaries_name(vui->colour_primaries))
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vui->colour_primaries = AVCOL_PRI_UNSPECIFIED;
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if (!av_color_transfer_name(vui->transfer_characteristics))
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vui->transfer_characteristics = AVCOL_TRC_UNSPECIFIED;
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if (!av_color_space_name(vui->matrix_coeffs))
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vui->matrix_coeffs = AVCOL_SPC_UNSPECIFIED;
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}
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}
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vui->chroma_loc_info_present_flag = get_bits1(gb);
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if (vui->chroma_loc_info_present_flag) {
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vui->chroma_sample_loc_type_top_field = get_ue_golomb_31(gb);
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vui->chroma_sample_loc_type_bottom_field = get_ue_golomb_31(gb);
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if (vui->chroma_sample_loc_type_top_field <= 5U)
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vui->chroma_location = vui->chroma_sample_loc_type_top_field + 1;
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else
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vui->chroma_location = AVCHROMA_LOC_UNSPECIFIED;
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} else
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vui->chroma_location = AVCHROMA_LOC_LEFT;
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}
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