mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
124 lines
4.0 KiB
C
124 lines
4.0 KiB
C
/*
|
|
* 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 Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; 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;
|
|
GetBitContext *gb = &s->HEVClc.gb;
|
|
uint8_t hash_type = get_bits(gb, 8);
|
|
|
|
for (cIdx = 0; cIdx < 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(HEVCLocalContext *lc)
|
|
{
|
|
GetBitContext *gb = &lc->gb;
|
|
int cancel, type, quincunx;
|
|
|
|
get_ue_golomb(gb); // frame_packing_arrangement_id
|
|
cancel = get_bits1(gb); // frame_packing_cancel_flag
|
|
if (cancel == 0) {
|
|
type = get_bits(gb, 7); // frame_packing_arrangement_type
|
|
quincunx = get_bits1(gb); // quincunx_sampling_flag
|
|
skip_bits(gb, 6); // content_interpretation_type
|
|
|
|
// 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 (quincunx == 0 && 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_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)
|
|
decode_nal_sei_decoded_picture_hash(s);
|
|
else if (payload_type == 45)
|
|
decode_nal_sei_frame_packing_arrangement(&s->HEVClc);
|
|
else {
|
|
av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
|
|
skip_bits(gb, 8 * payload_size);
|
|
}
|
|
} else { /* nal_unit_type == NAL_SEI_SUFFIX */
|
|
if (payload_type == 132)
|
|
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 0;
|
|
}
|
|
|
|
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)
|
|
{
|
|
do {
|
|
decode_nal_sei_message(s);
|
|
} while (more_rbsp_data(&s->HEVClc.gb));
|
|
return 0;
|
|
}
|