forked from KolibriOS/kolibrios
130 lines
4.3 KiB
C
130 lines
4.3 KiB
C
/*
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* HEVC Supplementary Enhancement Information messages
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*
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* Copyright (C) 2012 - 2013 Guillaume Martres
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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 "hevc.h"
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#include "golomb.h"
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static void decode_nal_sei_decoded_picture_hash(HEVCContext *s, int payload_size)
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{
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int cIdx, i;
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uint8_t hash_type;
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//uint16_t picture_crc;
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//uint32_t picture_checksum;
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GetBitContext *gb = &s->HEVClc->gb;
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hash_type = get_bits(gb, 8);
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for( cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++ ) {
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if ( hash_type == 0 ) {
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s->is_md5 = 1;
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for( i = 0; i < 16; i++) {
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s->md5[cIdx][i] = get_bits(gb, 8);
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}
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} else if( hash_type == 1 ) {
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// picture_crc = get_bits(gb, 16);
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skip_bits(gb, 16);
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} else if( hash_type == 2 ) {
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// picture_checksum = get_bits(gb, 32);
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skip_bits(gb, 32);
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}
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}
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}
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static void decode_nal_sei_frame_packing_arrangement(HEVCLocalContext *lc)
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{
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GetBitContext *gb = &lc->gb;
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int cancel, type, quincunx;
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get_ue_golomb(gb); // frame_packing_arrangement_id
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cancel = get_bits1(gb); // frame_packing_cancel_flag
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if ( cancel == 0 )
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{
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type = get_bits(gb, 7); // frame_packing_arrangement_type
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quincunx = get_bits1(gb); // quincunx_sampling_flag
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skip_bits(gb, 6); // content_interpretation_type
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// the following skips spatial_flipping_flag frame0_flipped_flag
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// field_views_flag current_frame_is_frame0_flag
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// frame0_self_contained_flag frame1_self_contained_flag
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skip_bits(gb, 6);
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if ( quincunx == 0 && type != 5 )
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skip_bits(gb, 16); // frame[01]_grid_position_[xy]
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skip_bits(gb, 8); // frame_packing_arrangement_reserved_byte
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skip_bits1(gb); // frame_packing_arrangement_persistance_flag
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}
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skip_bits1(gb); // upsampled_aspect_ratio_flag
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}
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static int decode_nal_sei_message(HEVCContext *s)
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{
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GetBitContext *gb = &s->HEVClc->gb;
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int payload_type = 0;
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int payload_size = 0;
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int byte = 0xFF;
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av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n");
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while (byte == 0xFF) {
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byte = get_bits(gb, 8);
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payload_type += byte;
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}
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byte = 0xFF;
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while (byte == 0xFF) {
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byte = get_bits(gb, 8);
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payload_size += byte;
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}
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if (s->nal_unit_type == NAL_SEI_PREFIX) {
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if (payload_type == 256 /*&& s->decode_checksum_sei*/)
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decode_nal_sei_decoded_picture_hash(s, payload_size);
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else if (payload_type == 45)
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decode_nal_sei_frame_packing_arrangement(s->HEVClc);
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else {
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av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
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skip_bits(gb, 8*payload_size);
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}
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} else { /* nal_unit_type == NAL_SEI_SUFFIX */
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if (payload_type == 132 /* && s->decode_checksum_sei */)
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decode_nal_sei_decoded_picture_hash(s, payload_size);
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else {
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av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type);
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skip_bits(gb, 8*payload_size);
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}
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}
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return 0;
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}
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static int more_rbsp_data(GetBitContext *gb)
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{
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return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80;
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}
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int ff_hevc_decode_nal_sei(HEVCContext *s)
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{
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do {
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decode_nal_sei_message(s);
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} while (more_rbsp_data(&s->HEVClc->gb));
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return 0;
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}
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