217 lines
7.1 KiB
C
217 lines
7.1 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 "golomb.h"
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#include "hevc.h"
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static void decode_nal_sei_decoded_picture_hash(HEVCContext *s)
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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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} 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_long(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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#ifdef USE_FULL
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static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s)
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{
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GetBitContext *gb = &s->HEVClc->gb;
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get_ue_golomb(gb); // frame_packing_arrangement_id
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s->sei_frame_packing_present = !get_bits1(gb);
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if (s->sei_frame_packing_present) {
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s->frame_packing_arrangement_type = get_bits(gb, 7);
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s->quincunx_subsampling = get_bits1(gb);
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s->content_interpretation_type = get_bits(gb, 6);
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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 (!s->quincunx_subsampling && s->frame_packing_arrangement_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 void decode_nal_sei_display_orientation(HEVCContext *s)
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{
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GetBitContext *gb = &s->HEVClc->gb;
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s->sei_display_orientation_present = !get_bits1(gb);
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if (s->sei_display_orientation_present) {
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s->sei_hflip = get_bits1(gb); // hor_flip
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s->sei_vflip = get_bits1(gb); // ver_flip
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s->sei_anticlockwise_rotation = get_bits(gb, 16);
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skip_bits1(gb); // display_orientation_persistence_flag
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}
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}
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static int decode_pic_timing(HEVCContext *s)
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{
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GetBitContext *gb = &s->HEVClc->gb;
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HEVCSPS *sps;
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if (!s->sps_list[s->active_seq_parameter_set_id])
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return(AVERROR(ENOMEM));
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sps = (HEVCSPS*)s->sps_list[s->active_seq_parameter_set_id]->data;
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if (sps->vui.frame_field_info_present_flag) {
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int pic_struct = get_bits(gb, 4);
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s->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN;
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if (pic_struct == 2) {
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av_log(s->avctx, AV_LOG_DEBUG, "BOTTOM Field\n");
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s->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
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} else if (pic_struct == 1) {
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av_log(s->avctx, AV_LOG_DEBUG, "TOP Field\n");
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s->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD;
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}
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get_bits(gb, 2); // source_scan_type
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get_bits(gb, 1); // duplicate_flag
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}
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return 1;
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}
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static int active_parameter_sets(HEVCContext *s)
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{
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GetBitContext *gb = &s->HEVClc->gb;
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int num_sps_ids_minus1;
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int i;
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unsigned active_seq_parameter_set_id;
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get_bits(gb, 4); // active_video_parameter_set_id
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get_bits(gb, 1); // self_contained_cvs_flag
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get_bits(gb, 1); // num_sps_ids_minus1
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num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1
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active_seq_parameter_set_id = get_ue_golomb_long(gb);
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if (active_seq_parameter_set_id >= MAX_SPS_COUNT) {
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av_log(s->avctx, AV_LOG_ERROR, "active_parameter_set_id %d invalid\n", active_seq_parameter_set_id);
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return AVERROR_INVALIDDATA;
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}
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s->active_seq_parameter_set_id = active_seq_parameter_set_id;
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for (i = 1; i <= num_sps_ids_minus1; i++)
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get_ue_golomb_long(gb); // active_seq_parameter_set_id[i]
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return 0;
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}
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#endif
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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);
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} else
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#ifdef USE_FULL
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if (payload_type == 45) {
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decode_nal_sei_frame_packing_arrangement(s);
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} else if (payload_type == 47) {
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decode_nal_sei_display_orientation(s);
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} else if (payload_type == 1){
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int ret = decode_pic_timing(s);
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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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return ret;
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} else if (payload_type == 129){
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active_parameter_sets(s);
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av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
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} else
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#endif
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#ifdef USE_FRAME_DURATION_SEI
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if (payload_type == 257) {
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/* frame duration in multiples of the frame rate period */
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s->frame_duration = get_bits(gb, 16);
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} else
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#endif
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{
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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);
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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 1;
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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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int ret;
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do {
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ret = decode_nal_sei_message(s);
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if (ret < 0)
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return(AVERROR(ENOMEM));
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} while (more_rbsp_data(&s->HEVClc->gb));
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return 1;
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}
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