1/*
2 * HEVC Parameter Set encoding
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include "put_golomb.h"
22#include "hevc_ps.h"
23#include "put_bits.h"
24
25static void write_ptl_layer(PutBitContext *pb, PTLCommon *ptl)
26{
27    int i;
28
29    put_bits(pb, 2, ptl->profile_space);
30    put_bits(pb, 1, ptl->tier_flag);
31    put_bits(pb, 5, ptl->profile_idc);
32    for (i = 0; i < 32; i++)
33        put_bits(pb, 1, ptl->profile_compatibility_flag[i]);
34    put_bits(pb, 1, ptl->progressive_source_flag);
35    put_bits(pb, 1, ptl->interlaced_source_flag);
36    put_bits(pb, 1, ptl->non_packed_constraint_flag);
37    put_bits(pb, 1, ptl->frame_only_constraint_flag);
38    put_bits32(pb, 0);   // reserved
39    put_bits(pb, 12, 0); // reserved
40}
41
42static void write_ptl(PutBitContext *pb, PTL *ptl, int max_num_sub_layers)
43{
44    int i;
45
46    write_ptl_layer(pb, &ptl->general_ptl);
47    put_bits(pb, 8, ptl->general_ptl.level_idc);
48
49    for (i = 0; i < max_num_sub_layers - 1; i++) {
50        put_bits(pb, 1, ptl->sub_layer_profile_present_flag[i]);
51        put_bits(pb, 1, ptl->sub_layer_level_present_flag[i]);
52    }
53
54    if (max_num_sub_layers > 1)
55        for (i = max_num_sub_layers - 1; i < 8; i++)
56            put_bits(pb, 2, 0); // reserved
57
58    for (i = 0; i < max_num_sub_layers - 1; i++) {
59        if (ptl->sub_layer_profile_present_flag[i])
60            write_ptl_layer(pb, &ptl->sub_layer_ptl[i]);
61        if (ptl->sub_layer_level_present_flag[i])
62            put_bits(pb, 8, ptl->sub_layer_ptl[i].level_idc);
63    }
64}
65
66int ff_hevc_encode_nal_vps(HEVCVPS *vps, unsigned int id,
67                           uint8_t *buf, int buf_size)
68{
69    PutBitContext pb;
70    int i, data_size;
71
72    init_put_bits(&pb, buf, buf_size);
73    put_bits(&pb,  4, id);
74    put_bits(&pb,  2, 3);                               // reserved
75    put_bits(&pb,  6, vps->vps_max_layers - 1);
76    put_bits(&pb,  3, vps->vps_max_sub_layers - 1);
77    put_bits(&pb,  1, vps->vps_temporal_id_nesting_flag);
78    put_bits(&pb, 16, 0xffff);                          // reserved
79
80    write_ptl(&pb, &vps->ptl, vps->vps_max_sub_layers);
81
82    put_bits(&pb, 1, vps->vps_sub_layer_ordering_info_present_flag);
83    for (i = vps->vps_sub_layer_ordering_info_present_flag ? 0 : vps->vps_max_layers - 1;
84         i < vps->vps_max_sub_layers; i++) {
85        set_ue_golomb(&pb, vps->vps_max_dec_pic_buffering[i] - 1);
86        set_ue_golomb(&pb, vps->vps_num_reorder_pics[i]);
87        set_ue_golomb(&pb, vps->vps_max_latency_increase[i] + 1);
88    }
89
90    put_bits(&pb, 6, vps->vps_max_layer_id);
91    set_ue_golomb(&pb, vps->vps_num_layer_sets - 1);
92
93    if (vps->vps_num_layer_sets > 1) {
94        avpriv_report_missing_feature(NULL, "Writing layer_id_included_flag");
95        return AVERROR_PATCHWELCOME;
96    }
97
98    put_bits(&pb, 1, vps->vps_timing_info_present_flag);
99    if (vps->vps_timing_info_present_flag) {
100        put_bits32(&pb, vps->vps_num_units_in_tick);
101        put_bits32(&pb, vps->vps_time_scale);
102        put_bits(&pb, 1, vps->vps_poc_proportional_to_timing_flag);
103        if (vps->vps_poc_proportional_to_timing_flag)
104            set_ue_golomb(&pb, vps->vps_num_ticks_poc_diff_one - 1);
105
106        set_ue_golomb(&pb, vps->vps_num_hrd_parameters);
107        if (vps->vps_num_hrd_parameters) {
108            avpriv_report_missing_feature(NULL, "Writing HRD parameters");
109            return AVERROR_PATCHWELCOME;
110        }
111    }
112
113    put_bits(&pb, 1, 0);    // extension flag
114
115    put_bits(&pb, 1, 1);    // stop bit
116    flush_put_bits(&pb);
117
118    data_size = put_bytes_output(&pb);
119
120    return data_size;
121}
122