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/*
* HEVC Supplementary Enhancement Information messages
*
* Copyright (C) 2012 - 2013 Guillaume Martres
* 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 "golomb.h"
#include "hevc.h"
static void decode_nal_sei_decoded_picture_hash(HEVCContext *s)
{
int cIdx, i;
uint8_t hash_type;
//uint16_t picture_crc;
//uint32_t picture_checksum;
GetBitContext *gb = &s->HEVClc->gb;
hash_type = get_bits(gb, 8);
for (cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++) {
if (hash_type == 0) {
s->is_md5 = 1;
for (i = 0; i < 16; i++)
s->md5[cIdx][i] = get_bits(gb, 8);
} else if (hash_type == 1) {
// picture_crc = get_bits(gb, 16);
skip_bits(gb, 16);
} else if (hash_type == 2) {
// picture_checksum = get_bits(gb, 32);
skip_bits(gb, 32);
}
}
}
static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s)
{
GetBitContext *gb = &s->HEVClc->gb;
get_ue_golomb(gb); // frame_packing_arrangement_id
s->sei_frame_packing_present = !get_bits1(gb);
if (s->sei_frame_packing_present) {
s->frame_packing_arrangement_type = get_bits(gb, 7);
s->quincunx_subsampling = get_bits1(gb);
s->content_interpretation_type = get_bits(gb, 6);
// the following skips spatial_flipping_flag frame0_flipped_flag
// field_views_flag current_frame_is_frame0_flag
// frame0_self_contained_flag frame1_self_contained_flag
skip_bits(gb, 6);
if (!s->quincunx_subsampling && s->frame_packing_arrangement_type != 5)
skip_bits(gb, 16); // frame[01]_grid_position_[xy]
skip_bits(gb, 8); // frame_packing_arrangement_reserved_byte
skip_bits1(gb); // frame_packing_arrangement_persistance_flag
}
skip_bits1(gb); // upsampled_aspect_ratio_flag
}
static int decode_pic_timing(HEVCContext *s)
{
GetBitContext *gb = &s->HEVClc->gb;
HEVCSPS *sps;
if (!s->sps_list[s->active_seq_parameter_set_id])
return(AVERROR(ENOMEM));
sps = (HEVCSPS*)s->sps_list[s->active_seq_parameter_set_id]->data;
if (sps->vui.frame_field_info_present_flag) {
int pic_struct = get_bits(gb, 4);
s->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN;
if (pic_struct == 2) {
av_log(s->avctx, AV_LOG_DEBUG, "BOTTOM Field\n");
s->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
} else if (pic_struct == 1) {
av_log(s->avctx, AV_LOG_DEBUG, "TOP Field\n");
s->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD;
}
get_bits(gb, 2); // source_scan_type
get_bits(gb, 1); // duplicate_flag
}
return 1;
}
static int active_parameter_sets(HEVCContext *s)
{
GetBitContext *gb = &s->HEVClc->gb;
int num_sps_ids_minus1;
int i;
unsigned active_seq_parameter_set_id;
get_bits(gb, 4); // active_video_parameter_set_id
get_bits(gb, 1); // self_contained_cvs_flag
get_bits(gb, 1); // num_sps_ids_minus1
num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1
active_seq_parameter_set_id = get_ue_golomb_long(gb);
if (active_seq_parameter_set_id >= MAX_SPS_COUNT) {
av_log(s->avctx, AV_LOG_ERROR, "active_parameter_set_id %d invalid\n", active_seq_parameter_set_id);
return AVERROR_INVALIDDATA;
}
s->active_seq_parameter_set_id = active_seq_parameter_set_id;
for (i = 1; i <= num_sps_ids_minus1; i++)
get_ue_golomb_long(gb); // active_seq_parameter_set_id[i]
return 0;
}
static int decode_nal_sei_message(HEVCContext *s)
{
GetBitContext *gb = &s->HEVClc->gb;
int payload_type = 0;
int payload_size = 0;
int byte = 0xFF;
av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n");
while (byte == 0xFF) {
byte = get_bits(gb, 8);
payload_type += byte;
}
byte = 0xFF;
while (byte == 0xFF) {
byte = get_bits(gb, 8);
payload_size += byte;
}
if (s->nal_unit_type == NAL_SEI_PREFIX) {
if (payload_type == 256 /*&& s->decode_checksum_sei*/) {
decode_nal_sei_decoded_picture_hash(s);
return 1;
} else if (payload_type == 45) {
decode_nal_sei_frame_packing_arrangement(s);
return 1;
} else if (payload_type == 1){
int ret = decode_pic_timing(s);
av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
skip_bits(gb, 8 * payload_size);
return ret;
} else if (payload_type == 129){
active_parameter_sets(s);
av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
return 1;
} else {
av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
skip_bits(gb, 8*payload_size);
return 1;
}
} else { /* nal_unit_type == NAL_SEI_SUFFIX */
if (payload_type == 132 /* && s->decode_checksum_sei */)
decode_nal_sei_decoded_picture_hash(s);
else {
av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type);
skip_bits(gb, 8 * payload_size);
}
return 1;
}
}
static int more_rbsp_data(GetBitContext *gb)
{
return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80;
}
int ff_hevc_decode_nal_sei(HEVCContext *s)
{
int ret;
do {
ret = decode_nal_sei_message(s);
if (ret < 0)
return(AVERROR(ENOMEM));
} while (more_rbsp_data(&s->HEVClc->gb));
return 1;
}
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