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