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FFmpeg/libavcodec/hevc_ps.c

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  1. /*

  2.  * HEVC Parameter Set decoding

  3.  *

  4.  * Copyright (C) 2012 - 2103 Guillaume Martres

  5.  * Copyright (C) 2012 - 2103 Mickael Raulet

  6.  * Copyright (C) 2012 - 2013 Gildas Cocherel

  7.  * Copyright (C) 2013 Vittorio Giovara

  8.  *

  9.  * This file is part of Libav.

  10.  *

  11.  * Libav is free software; you can redistribute it and/or

  12.  * modify it under the terms of the GNU Lesser General Public

  13.  * License as published by the Free Software Foundation; either

  14.  * version 2.1 of the License, or (at your option) any later version.

  15.  *

  16.  * Libav is distributed in the hope that it will be useful,

  17.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  18.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  19.  * Lesser General Public License for more details.

  20.  *

  21.  * You should have received a copy of the GNU Lesser General Public

  22.  * License along with Libav; if not, write to the Free Software

  23.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  24.  */

  25. 

  26. #include "libavutil/imgutils.h"

  27. 

  28. #include "golomb.h"

  29. #include "hevc.h"

  30. 

  31. static const uint8_t default_scaling_list_intra[] = {

  32.     16, 16, 16, 16, 17, 18, 21, 24,

  33.     16, 16, 16, 16, 17, 19, 22, 25,

  34.     16, 16, 17, 18, 20, 22, 25, 29,

  35.     16, 16, 18, 21, 24, 27, 31, 36,

  36.     17, 17, 20, 24, 30, 35, 41, 47,

  37.     18, 19, 22, 27, 35, 44, 54, 65,

  38.     21, 22, 25, 31, 41, 54, 70, 88,

  39.     24, 25, 29, 36, 47, 65, 88, 115

  40. };

  41. 

  42. static const uint8_t default_scaling_list_inter[] = {

  43.     16, 16, 16, 16, 17, 18, 20, 24,

  44.     16, 16, 16, 17, 18, 20, 24, 25,

  45.     16, 16, 17, 18, 20, 24, 25, 28,

  46.     16, 17, 18, 20, 24, 25, 28, 33,

  47.     17, 18, 20, 24, 25, 28, 33, 41,

  48.     18, 20, 24, 25, 28, 33, 41, 54,

  49.     20, 24, 25, 28, 33, 41, 54, 71,

  50.     24, 25, 28, 33, 41, 54, 71, 91

  51. };

  52. 

  53. static const AVRational vui_sar[] = {

  54.     {  0,   1 },

  55.     {  1,   1 },

  56.     { 12,  11 },

  57.     { 10,  11 },

  58.     { 16,  11 },

  59.     { 40,  33 },

  60.     { 24,  11 },

  61.     { 20,  11 },

  62.     { 32,  11 },

  63.     { 80,  33 },

  64.     { 18,  11 },

  65.     { 15,  11 },

  66.     { 64,  33 },

  67.     { 160, 99 },

  68.     {  4,   3 },

  69.     {  3,   2 },

  70.     {  2,   1 },

  71. };

  72. 

  73. int ff_hevc_decode_short_term_rps(HEVCContext *s, ShortTermRPS *rps,

  74.                                   const HEVCSPS *sps, int is_slice_header)

  75. {

  76.     HEVCLocalContext *lc = &s->HEVClc;

  77.     uint8_t rps_predict = 0;

  78.     int delta_poc;

  79.     int k0 = 0;

  80.     int k1 = 0;

  81.     int k  = 0;

  82.     int i;

  83. 

  84.     GetBitContext *gb = &lc->gb;

  85. 

  86.     if (rps != sps->st_rps && sps->nb_st_rps)

  87.         rps_predict = get_bits1(gb);

  88. 

  89.     if (rps_predict) {

  90.         const ShortTermRPS *rps_ridx;

  91.         int delta_rps, abs_delta_rps;

  92.         uint8_t use_delta_flag = 0;

  93.         uint8_t delta_rps_sign;

  94. 

  95.         if (is_slice_header) {

  96.             int delta_idx = get_ue_golomb_long(gb) + 1;

  97.             if (delta_idx > sps->nb_st_rps) {

  98.                 av_log(s->avctx, AV_LOG_ERROR,

  99.                        "Invalid value of delta_idx in slice header RPS: %d > %d.\n",

  100.                        delta_idx, sps->nb_st_rps);

  101.                 return AVERROR_INVALIDDATA;

  102.             }

  103.             rps_ridx = &sps->st_rps[sps->nb_st_rps - delta_idx];

  104.         } else

  105.             rps_ridx = &sps->st_rps[rps - sps->st_rps - 1];

  106. 

  107.         delta_rps_sign = get_bits1(gb);

  108.         abs_delta_rps  = get_ue_golomb_long(gb) + 1;

  109.         delta_rps      = (1 - (delta_rps_sign << 1)) * abs_delta_rps;

  110.         for (i = 0; i <= rps_ridx->num_delta_pocs; i++) {

  111.             int used = rps->used[k] = get_bits1(gb);

  112. 

  113.             if (!used)

  114.                 use_delta_flag = get_bits1(gb);

  115. 

  116.             if (used || use_delta_flag) {

  117.                 if (i < rps_ridx->num_delta_pocs)

  118.                     delta_poc = delta_rps + rps_ridx->delta_poc[i];

  119.                 else

  120.                     delta_poc = delta_rps;

  121.                 rps->delta_poc[k] = delta_poc;

  122.                 if (delta_poc < 0)

  123.                     k0++;

  124.                 else

  125.                     k1++;

  126.                 k++;

  127.             }

  128.         }

  129. 

  130.         rps->num_delta_pocs    = k;

  131.         rps->num_negative_pics = k0;

  132.         // sort in increasing order (smallest first)

  133.         if (rps->num_delta_pocs != 0) {

  134.             int used, tmp;

  135.             for (i = 1; i < rps->num_delta_pocs; i++) {

  136.                 delta_poc = rps->delta_poc[i];

  137.                 used      = rps->used[i];

  138.                 for (k = i - 1; k >= 0; k--) {

  139.                     tmp = rps->delta_poc[k];

  140.                     if (delta_poc < tmp) {

  141.                         rps->delta_poc[k + 1] = tmp;

  142.                         rps->used[k + 1]      = rps->used[k];

  143.                         rps->delta_poc[k]     = delta_poc;

  144.                         rps->used[k]          = used;

  145.                     }

  146.                 }

  147.             }

  148.         }

  149.         if ((rps->num_negative_pics >> 1) != 0) {

  150.             int used;

  151.             k = rps->num_negative_pics - 1;

  152.             // flip the negative values to largest first

  153.             for (i = 0; i < rps->num_negative_pics >> 1; i++) {

  154.                 delta_poc         = rps->delta_poc[i];

  155.                 used              = rps->used[i];

  156.                 rps->delta_poc[i] = rps->delta_poc[k];

  157.                 rps->used[i]      = rps->used[k];

  158.                 rps->delta_poc[k] = delta_poc;

  159.                 rps->used[k]      = used;

  160.                 k--;

  161.             }

  162.         }

  163.     } else {

  164.         unsigned int prev, nb_positive_pics;

  165.         rps->num_negative_pics = get_ue_golomb_long(gb);

  166.         nb_positive_pics       = get_ue_golomb_long(gb);

  167. 

  168.         if (rps->num_negative_pics >= MAX_REFS ||

  169.             nb_positive_pics >= MAX_REFS) {

  170.             av_log(s->avctx, AV_LOG_ERROR, "Too many refs in a short term RPS.\n");

  171.             return AVERROR_INVALIDDATA;

  172.         }

  173. 

  174.         rps->num_delta_pocs = rps->num_negative_pics + nb_positive_pics;

  175.         if (rps->num_delta_pocs) {

  176.             prev = 0;

  177.             for (i = 0; i < rps->num_negative_pics; i++) {

  178.                 delta_poc = get_ue_golomb_long(gb) + 1;

  179.                 prev -= delta_poc;

  180.                 rps->delta_poc[i] = prev;

  181.                 rps->used[i]      = get_bits1(gb);

  182.             }

  183.             prev = 0;

  184.             for (i = 0; i < nb_positive_pics; i++) {

  185.                 delta_poc = get_ue_golomb_long(gb) + 1;

  186.                 prev += delta_poc;

  187.                 rps->delta_poc[rps->num_negative_pics + i] = prev;

  188.                 rps->used[rps->num_negative_pics + i]      = get_bits1(gb);

  189.             }

  190.         }

  191.     }

  192.     return 0;

  193. }

  194. 

  195. static int decode_profile_tier_level(HEVCLocalContext *lc, PTL *ptl,

  196.                                      int max_num_sub_layers)

  197. {

  198.     int i, j;

  199.     GetBitContext *gb = &lc->gb;

  200. 

  201.     ptl->general_profile_space = get_bits(gb, 2);

  202.     ptl->general_tier_flag     = get_bits1(gb);

  203.     ptl->general_profile_idc   = get_bits(gb, 5);

  204.     for (i = 0; i < 32; i++)

  205.         ptl->general_profile_compatibility_flag[i] = get_bits1(gb);

  206.     skip_bits1(gb); // general_progressive_source_flag

  207.     skip_bits1(gb); // general_interlaced_source_flag

  208.     skip_bits1(gb); // general_non_packed_constraint_flag

  209.     skip_bits1(gb); // general_frame_only_constraint_flag

  210.     if (get_bits(gb, 16) != 0) // XXX_reserved_zero_44bits[0..15]

  211.         return -1;

  212.     if (get_bits(gb, 16) != 0) // XXX_reserved_zero_44bits[16..31]

  213.         return -1;

  214.     if (get_bits(gb, 12) != 0) // XXX_reserved_zero_44bits[32..43]

  215.         return -1;

  216. 

  217.     ptl->general_level_idc = get_bits(gb, 8);

  218.     for (i = 0; i < max_num_sub_layers - 1; i++) {

  219.         ptl->sub_layer_profile_present_flag[i] = get_bits1(gb);

  220.         ptl->sub_layer_level_present_flag[i]   = get_bits1(gb);

  221.     }

  222.     if (max_num_sub_layers - 1 > 0)

  223.         for (i = max_num_sub_layers - 1; i < 8; i++)

  224.             skip_bits(gb, 2);  // reserved_zero_2bits[i]

  225.     for (i = 0; i < max_num_sub_layers - 1; i++) {

  226.         if (ptl->sub_layer_profile_present_flag[i]) {

  227.             ptl->sub_layer_profile_space[i] = get_bits(gb, 2);

  228.             ptl->sub_layer_tier_flag[i]     = get_bits(gb, 1);

  229.             ptl->sub_layer_profile_idc[i]   = get_bits(gb, 5);

  230.             for (j = 0; j < 32; j++)

  231.                 ptl->sub_layer_profile_compatibility_flags[i][j] = get_bits1(gb);

  232.             skip_bits1(gb); // sub_layer_progressive_source_flag

  233.             skip_bits1(gb); // sub_layer_interlaced_source_flag

  234.             skip_bits1(gb); // sub_layer_non_packed_constraint_flag

  235.             skip_bits1(gb); // sub_layer_frame_only_constraint_flag

  236. 

  237.             if (get_bits(gb, 16) != 0) // sub_layer_reserved_zero_44bits[0..15]

  238.                 return -1;

  239.             if (get_bits(gb, 16) != 0) // sub_layer_reserved_zero_44bits[16..31]

  240.                 return -1;

  241.             if (get_bits(gb, 12) != 0) // sub_layer_reserved_zero_44bits[32..43]

  242.                 return -1;

  243.         }

  244.         if (ptl->sub_layer_level_present_flag[i])

  245.             ptl->sub_layer_level_idc[i] = get_bits(gb, 8);

  246.     }

  247.     return 0;

  248. }

  249. 

  250. static void decode_sublayer_hrd(HEVCContext *s, int nb_cpb,

  251.                                 int subpic_params_present)

  252. {

  253.     GetBitContext *gb = &s->HEVClc.gb;

  254.     int i;

  255. 

  256.     for (i = 0; i < nb_cpb; i++) {

  257.         get_ue_golomb_long(gb); // bit_rate_value_minus1

  258.         get_ue_golomb_long(gb); // cpb_size_value_minus1

  259. 

  260.         if (subpic_params_present) {

  261.             get_ue_golomb_long(gb); // cpb_size_du_value_minus1

  262.             get_ue_golomb_long(gb); // bit_rate_du_value_minus1

  263.         }

  264.         skip_bits1(gb); // cbr_flag

  265.     }

  266. }

  267. 

  268. static void decode_hrd(HEVCContext *s, int common_inf_present,

  269.                        int max_sublayers)

  270. {

  271.     GetBitContext *gb = &s->HEVClc.gb;

  272.     int nal_params_present = 0, vcl_params_present = 0;

  273.     int subpic_params_present = 0;

  274.     int i;

  275. 

  276.     if (common_inf_present) {

  277.         nal_params_present = get_bits1(gb);

  278.         vcl_params_present = get_bits1(gb);

  279. 

  280.         if (nal_params_present || vcl_params_present) {

  281.             subpic_params_present = get_bits1(gb);

  282. 

  283.             if (subpic_params_present) {

  284.                 skip_bits(gb, 8); // tick_divisor_minus2

  285.                 skip_bits(gb, 5); // du_cpb_removal_delay_increment_length_minus1

  286.                 skip_bits(gb, 1); // sub_pic_cpb_params_in_pic_timing_sei_flag

  287.                 skip_bits(gb, 5); // dpb_output_delay_du_length_minus1

  288.             }

  289. 

  290.             skip_bits(gb, 4); // bit_rate_scale

  291.             skip_bits(gb, 4); // cpb_size_scale

  292. 

  293.             if (subpic_params_present)

  294.                 skip_bits(gb, 4);  // cpb_size_du_scale

  295. 

  296.             skip_bits(gb, 5); // initial_cpb_removal_delay_length_minus1

  297.             skip_bits(gb, 5); // au_cpb_removal_delay_length_minus1

  298.             skip_bits(gb, 5); // dpb_output_delay_length_minus1

  299.         }

  300.     }

  301. 

  302.     for (i = 0; i < max_sublayers; i++) {

  303.         int low_delay = 0;

  304.         int nb_cpb = 1;

  305.         int fixed_rate = get_bits1(gb);

  306. 

  307.         if (!fixed_rate)

  308.             fixed_rate = get_bits1(gb);

  309. 

  310.         if (fixed_rate)

  311.             get_ue_golomb_long(gb);  // elemental_duration_in_tc_minus1

  312.         else

  313.             low_delay = get_bits1(gb);

  314. 

  315.         if (!low_delay)

  316.             nb_cpb = get_ue_golomb_long(gb) + 1;

  317. 

  318.         if (nal_params_present)

  319.             decode_sublayer_hrd(s, nb_cpb, subpic_params_present);

  320.         if (vcl_params_present)

  321.             decode_sublayer_hrd(s, nb_cpb, subpic_params_present);

  322.     }

  323. }

  324. 

  325. int ff_hevc_decode_nal_vps(HEVCContext *s)

  326. {

  327.     int i,j;

  328.     GetBitContext *gb = &s->HEVClc.gb;

  329.     int vps_id = 0;

  330.     HEVCVPS *vps;

  331. 

  332.     av_log(s->avctx, AV_LOG_DEBUG, "Decoding VPS\n");

  333. 

  334.     vps = av_mallocz(sizeof(*vps));

  335.     if (!vps)

  336.         return AVERROR(ENOMEM);

  337. 

  338.     vps_id = get_bits(gb, 4);

  339.     if (vps_id >= MAX_VPS_COUNT) {

  340.         av_log(s->avctx, AV_LOG_ERROR, "VPS id out of range: %d\n", vps_id);

  341.         goto err;

  342.     }

  343. 

  344.     if (get_bits(gb, 2) != 3) { // vps_reserved_three_2bits

  345.         av_log(s->avctx, AV_LOG_ERROR, "vps_reserved_three_2bits is not three\n");

  346.         goto err;

  347.     }

  348. 

  349.     vps->vps_max_layers               = get_bits(gb, 6) + 1;

  350.     vps->vps_max_sub_layers           = get_bits(gb, 3) + 1;

  351.     vps->vps_temporal_id_nesting_flag = get_bits1(gb);

  352. 

  353.     if (get_bits(gb, 16) != 0xffff) { // vps_reserved_ffff_16bits

  354.         av_log(s->avctx, AV_LOG_ERROR, "vps_reserved_ffff_16bits is not 0xffff\n");

  355.         goto err;

  356.     }

  357. 

  358.     if (vps->vps_max_sub_layers > MAX_SUB_LAYERS) {

  359.         av_log(s->avctx, AV_LOG_ERROR, "vps_max_sub_layers out of range: %d\n",

  360.                vps->vps_max_sub_layers);

  361.         goto err;

  362.     }

  363. 

  364.     if (decode_profile_tier_level(&s->HEVClc, &vps->ptl, vps->vps_max_sub_layers) < 0) {

  365.         av_log(s->avctx, AV_LOG_ERROR, "Error decoding profile tier level.\n");

  366.         goto err;

  367.     }

  368.     vps->vps_sub_layer_ordering_info_present_flag = get_bits1(gb);

  369. 

  370.     i = vps->vps_sub_layer_ordering_info_present_flag ? 0 : vps->vps_max_sub_layers - 1;

  371.     for (; i < vps->vps_max_sub_layers; i++) {

  372.         vps->vps_max_dec_pic_buffering[i] = get_ue_golomb_long(gb) + 1;

  373.         vps->vps_num_reorder_pics[i]      = get_ue_golomb_long(gb);

  374.         vps->vps_max_latency_increase[i]  = get_ue_golomb_long(gb) - 1;

  375. 

  376.         if (vps->vps_max_dec_pic_buffering[i] > MAX_DPB_SIZE) {

  377.             av_log(s->avctx, AV_LOG_ERROR, "vps_max_dec_pic_buffering_minus1 out of range: %d\n",

  378.                    vps->vps_max_dec_pic_buffering[i] - 1);

  379.             goto err;

  380.         }

  381.         if (vps->vps_num_reorder_pics[i] > vps->vps_max_dec_pic_buffering[i] - 1) {

  382.             av_log(s->avctx, AV_LOG_ERROR, "vps_max_num_reorder_pics out of range: %d\n",

  383.                    vps->vps_num_reorder_pics[i]);

  384.             goto err;

  385.         }

  386.     }

  387. 

  388.     vps->vps_max_layer_id   = get_bits(gb, 6);

  389.     vps->vps_num_layer_sets = get_ue_golomb_long(gb) + 1;

  390.     for (i = 1; i < vps->vps_num_layer_sets; i++)

  391.         for (j = 0; j <= vps->vps_max_layer_id; j++)

  392.             skip_bits(gb, 1);  // layer_id_included_flag[i][j]

  393. 

  394.     vps->vps_timing_info_present_flag = get_bits1(gb);

  395.     if (vps->vps_timing_info_present_flag) {

  396.         vps->vps_num_units_in_tick               = get_bits_long(gb, 32);

  397.         vps->vps_time_scale                      = get_bits_long(gb, 32);

  398.         vps->vps_poc_proportional_to_timing_flag = get_bits1(gb);

  399.         if (vps->vps_poc_proportional_to_timing_flag)

  400.             vps->vps_num_ticks_poc_diff_one = get_ue_golomb_long(gb) + 1;

  401.         vps->vps_num_hrd_parameters = get_ue_golomb_long(gb);

  402.         for (i = 0; i < vps->vps_num_hrd_parameters; i++) {

  403.             int common_inf_present = 1;

  404. 

  405.             get_ue_golomb_long(gb); // hrd_layer_set_idx

  406.             if (i)

  407.                 common_inf_present = get_bits1(gb);

  408.             decode_hrd(s, common_inf_present, vps->vps_max_sub_layers);

  409.         }

  410.     }

  411.     get_bits1(gb); /* vps_extension_flag */

  412. 

  413.     av_free(s->vps_list[vps_id]);

  414.     s->vps_list[vps_id] = vps;

  415.     return 0;

  416. 

  417. err:

  418.     av_free(vps);

  419.     return AVERROR_INVALIDDATA;

  420. }

  421. 

  422. static void decode_vui(HEVCContext *s, HEVCSPS *sps)

  423. {

  424.     VUI *vui          = &sps->vui;

  425.     GetBitContext *gb = &s->HEVClc.gb;

  426.     int sar_present;

  427. 

  428.     av_log(s->avctx, AV_LOG_DEBUG, "Decoding VUI\n");

  429. 

  430.     sar_present = get_bits1(gb);

  431.     if (sar_present) {

  432.         uint8_t sar_idx = get_bits(gb, 8);

  433.         if (sar_idx < FF_ARRAY_ELEMS(vui_sar))

  434.             vui->sar = vui_sar[sar_idx];

  435.         else if (sar_idx == 255) {

  436.             vui->sar.num = get_bits(gb, 16);

  437.             vui->sar.den = get_bits(gb, 16);

  438.         } else

  439.             av_log(s->avctx, AV_LOG_WARNING,

  440.                    "Unknown SAR index: %u.\n", sar_idx);

  441.     }

  442. 

  443.     vui->overscan_info_present_flag = get_bits1(gb);

  444.     if (vui->overscan_info_present_flag)

  445.         vui->overscan_appropriate_flag = get_bits1(gb);

  446. 

  447.     vui->video_signal_type_present_flag = get_bits1(gb);

  448.     if (vui->video_signal_type_present_flag) {

  449.         vui->video_format                    = get_bits(gb, 3);

  450.         vui->video_full_range_flag           = get_bits1(gb);

  451.         vui->colour_description_present_flag = get_bits1(gb);

  452.         if (vui->colour_description_present_flag) {

  453.             vui->colour_primaries        = get_bits(gb, 8);

  454.             vui->transfer_characteristic = get_bits(gb, 8);

  455.             vui->matrix_coeffs           = get_bits(gb, 8);

  456.         }

  457.     }

  458. 

  459.     vui->chroma_loc_info_present_flag = get_bits1(gb);

  460.     if (vui->chroma_loc_info_present_flag) {

  461.         vui->chroma_sample_loc_type_top_field    = get_ue_golomb_long(gb);

  462.         vui->chroma_sample_loc_type_bottom_field = get_ue_golomb_long(gb);

  463.     }

  464. 

  465.     vui->neutra_chroma_indication_flag = get_bits1(gb);

  466.     vui->field_seq_flag                = get_bits1(gb);

  467.     vui->frame_field_info_present_flag = get_bits1(gb);

  468. 

  469.     vui->default_display_window_flag = get_bits1(gb);

  470.     if (vui->default_display_window_flag) {

  471.         //TODO: * 2 is only valid for 420

  472.         vui->def_disp_win.left_offset   = get_ue_golomb_long(gb) * 2;

  473.         vui->def_disp_win.right_offset  = get_ue_golomb_long(gb) * 2;

  474.         vui->def_disp_win.top_offset    = get_ue_golomb_long(gb) * 2;

  475.         vui->def_disp_win.bottom_offset = get_ue_golomb_long(gb) * 2;

  476. 

  477.         if (s->apply_defdispwin &&

  478.             s->avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) {

  479.             av_log(s->avctx, AV_LOG_DEBUG,

  480.                    "discarding vui default display window, "

  481.                    "original values are l:%u r:%u t:%u b:%u\n",

  482.                    vui->def_disp_win.left_offset,

  483.                    vui->def_disp_win.right_offset,

  484.                    vui->def_disp_win.top_offset,

  485.                    vui->def_disp_win.bottom_offset);

  486. 

  487.             vui->def_disp_win.left_offset   =

  488.             vui->def_disp_win.right_offset  =

  489.             vui->def_disp_win.top_offset    =

  490.             vui->def_disp_win.bottom_offset = 0;

  491.         }

  492.     }

  493. 

  494.     vui->vui_timing_info_present_flag = get_bits1(gb);

  495.     if (vui->vui_timing_info_present_flag) {

  496.         vui->vui_num_units_in_tick               = get_bits(gb, 32);

  497.         vui->vui_time_scale                      = get_bits(gb, 32);

  498.         vui->vui_poc_proportional_to_timing_flag = get_bits1(gb);

  499.         if (vui->vui_poc_proportional_to_timing_flag)

  500.             vui->vui_num_ticks_poc_diff_one_minus1 = get_ue_golomb_long(gb);

  501.         vui->vui_hrd_parameters_present_flag = get_bits1(gb);

  502.         if (vui->vui_hrd_parameters_present_flag)

  503.             decode_hrd(s, 1, sps->max_sub_layers);

  504.     }

  505. 

  506.     vui->bitstream_restriction_flag = get_bits1(gb);

  507.     if (vui->bitstream_restriction_flag) {

  508.         vui->tiles_fixed_structure_flag              = get_bits1(gb);

  509.         vui->motion_vectors_over_pic_boundaries_flag = get_bits1(gb);

  510.         vui->restricted_ref_pic_lists_flag           = get_bits1(gb);

  511.         vui->min_spatial_segmentation_idc            = get_ue_golomb_long(gb);

  512.         vui->max_bytes_per_pic_denom                 = get_ue_golomb_long(gb);

  513.         vui->max_bits_per_min_cu_denom               = get_ue_golomb_long(gb);

  514.         vui->log2_max_mv_length_horizontal           = get_ue_golomb_long(gb);

  515.         vui->log2_max_mv_length_vertical             = get_ue_golomb_long(gb);

  516.     }

  517. }

  518. 

  519. static void set_default_scaling_list_data(ScalingList *sl)

  520. {

  521.     int matrixId;

  522. 

  523.     for (matrixId = 0; matrixId < 6; matrixId++) {

  524.         // 4x4 default is 16

  525.         memset(sl->sl[0][matrixId], 16, 16);

  526.         sl->sl_dc[0][matrixId] = 16; // default for 16x16

  527.         sl->sl_dc[1][matrixId] = 16; // default for 32x32

  528.     }

  529.     memcpy(sl->sl[1][0], default_scaling_list_intra, 64);

  530.     memcpy(sl->sl[1][1], default_scaling_list_intra, 64);

  531.     memcpy(sl->sl[1][2], default_scaling_list_intra, 64);

  532.     memcpy(sl->sl[1][3], default_scaling_list_inter, 64);

  533.     memcpy(sl->sl[1][4], default_scaling_list_inter, 64);

  534.     memcpy(sl->sl[1][5], default_scaling_list_inter, 64);

  535.     memcpy(sl->sl[2][0], default_scaling_list_intra, 64);

  536.     memcpy(sl->sl[2][1], default_scaling_list_intra, 64);

  537.     memcpy(sl->sl[2][2], default_scaling_list_intra, 64);

  538.     memcpy(sl->sl[2][3], default_scaling_list_inter, 64);

  539.     memcpy(sl->sl[2][4], default_scaling_list_inter, 64);

  540.     memcpy(sl->sl[2][5], default_scaling_list_inter, 64);

  541.     memcpy(sl->sl[3][0], default_scaling_list_intra, 64);

  542.     memcpy(sl->sl[3][1], default_scaling_list_inter, 64);

  543. }

  544. 

  545. static int scaling_list_data(HEVCContext *s, ScalingList *sl)

  546. {

  547.     GetBitContext *gb = &s->HEVClc.gb;

  548.     uint8_t scaling_list_pred_mode_flag[4][6];

  549.     int32_t scaling_list_dc_coef[2][6];

  550.     int size_id, matrix_id, i, pos, delta;

  551. 

  552.     for (size_id = 0; size_id < 4; size_id++)

  553.         for (matrix_id = 0; matrix_id < (size_id == 3 ? 2 : 6); matrix_id++) {

  554.             scaling_list_pred_mode_flag[size_id][matrix_id] = get_bits1(gb);

  555.             if (!scaling_list_pred_mode_flag[size_id][matrix_id]) {

  556.                 delta = get_ue_golomb_long(gb);

  557.                 /* Only need to handle non-zero delta. Zero means default,

  558.                  * which should already be in the arrays. */

  559.                 if (delta) {

  560.                     // Copy from previous array.

  561.                     if (matrix_id - delta < 0) {

  562.                         av_log(s->avctx, AV_LOG_ERROR,

  563.                                "Invalid delta in scaling list data: %d.\n", delta);

  564.                         return AVERROR_INVALIDDATA;

  565.                     }

  566. 

  567.                     memcpy(sl->sl[size_id][matrix_id],

  568.                            sl->sl[size_id][matrix_id - delta],

  569.                            size_id > 0 ? 64 : 16);

  570.                     if (size_id > 1)

  571.                         sl->sl_dc[size_id - 2][matrix_id] = sl->sl_dc[size_id - 2][matrix_id - delta];

  572.                 }

  573.             } else {

  574.                 int next_coef, coef_num;

  575.                 int32_t scaling_list_delta_coef;

  576. 

  577.                 next_coef = 8;

  578.                 coef_num  = FFMIN(64, 1 << (4 + (size_id << 1)));

  579.                 if (size_id > 1) {

  580.                     scaling_list_dc_coef[size_id - 2][matrix_id] = get_se_golomb(gb) + 8;

  581.                     next_coef = scaling_list_dc_coef[size_id - 2][matrix_id];

  582.                     sl->sl_dc[size_id - 2][matrix_id] = next_coef;

  583.                 }

  584.                 for (i = 0; i < coef_num; i++) {

  585.                     if (size_id == 0)

  586.                         pos = 4 * ff_hevc_diag_scan4x4_y[i] +

  587.                                   ff_hevc_diag_scan4x4_x[i];

  588.                     else

  589.                         pos = 8 * ff_hevc_diag_scan8x8_y[i] +

  590.                                   ff_hevc_diag_scan8x8_x[i];

  591. 

  592.                     scaling_list_delta_coef = get_se_golomb(gb);

  593.                     next_coef = (next_coef + scaling_list_delta_coef + 256) % 256;

  594.                     sl->sl[size_id][matrix_id][pos] = next_coef;

  595.                 }

  596.             }

  597.         }

  598. 

  599.     return 0;

  600. }

  601. 

  602. int ff_hevc_decode_nal_sps(HEVCContext *s)

  603. {

  604.     const AVPixFmtDescriptor *desc;

  605.     GetBitContext *gb = &s->HEVClc.gb;

  606.     int ret    = 0;

  607.     int sps_id = 0;

  608.     int log2_diff_max_min_transform_block_size;

  609.     int bit_depth_chroma, start, vui_present, sublayer_ordering_info;

  610.     int i;

  611. 

  612.     HEVCSPS *sps;

  613.     AVBufferRef *sps_buf = av_buffer_allocz(sizeof(*sps));

  614. 

  615.     if (!sps_buf)

  616.         return AVERROR(ENOMEM);

  617.     sps = (HEVCSPS*)sps_buf->data;

  618. 

  619.     av_log(s->avctx, AV_LOG_DEBUG, "Decoding SPS\n");

  620. 

  621.     // Coded parameters

  622. 

  623.     sps->vps_id = get_bits(gb, 4);

  624.     if (sps->vps_id >= MAX_VPS_COUNT) {

  625.         av_log(s->avctx, AV_LOG_ERROR, "VPS id out of range: %d\n", sps->vps_id);

  626.         ret = AVERROR_INVALIDDATA;

  627.         goto err;

  628.     }

  629. 

  630.     sps->max_sub_layers = get_bits(gb, 3) + 1;

  631.     if (sps->max_sub_layers > MAX_SUB_LAYERS) {

  632.         av_log(s->avctx, AV_LOG_ERROR, "sps_max_sub_layers out of range: %d\n",

  633.                sps->max_sub_layers);

  634.         ret = AVERROR_INVALIDDATA;

  635.         goto err;

  636.     }

  637. 

  638.     skip_bits1(gb); // temporal_id_nesting_flag

  639.     if (decode_profile_tier_level(&s->HEVClc, &sps->ptl,

  640.                                   sps->max_sub_layers) < 0) {

  641.         av_log(s->avctx, AV_LOG_ERROR, "error decoding profile tier level\n");

  642.         ret = AVERROR_INVALIDDATA;

  643.         goto err;

  644.     }

  645.     sps_id = get_ue_golomb_long(gb);

  646.     if (sps_id >= MAX_SPS_COUNT) {

  647.         av_log(s->avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", sps_id);

  648.         ret = AVERROR_INVALIDDATA;

  649.         goto err;

  650.     }

  651. 

  652.     sps->chroma_format_idc = get_ue_golomb_long(gb);

  653.     if (sps->chroma_format_idc != 1) {

  654.         avpriv_report_missing_feature(s->avctx, "chroma_format_idc != 1\n");

  655.         ret = AVERROR_PATCHWELCOME;

  656.         goto err;

  657.     }

  658. 

  659.     if (sps->chroma_format_idc == 3)

  660.         sps->separate_colour_plane_flag = get_bits1(gb);

  661. 

  662.     sps->width  = get_ue_golomb_long(gb);

  663.     sps->height = get_ue_golomb_long(gb);

  664.     if ((ret = av_image_check_size(sps->width,

  665.                                    sps->height, 0, s->avctx)) < 0)

  666.         goto err;

  667. 

  668.     if (get_bits1(gb)) { // pic_conformance_flag

  669.         //TODO: * 2 is only valid for 420

  670.         sps->pic_conf_win.left_offset   = get_ue_golomb_long(gb) * 2;

  671.         sps->pic_conf_win.right_offset  = get_ue_golomb_long(gb) * 2;

  672.         sps->pic_conf_win.top_offset    = get_ue_golomb_long(gb) * 2;

  673.         sps->pic_conf_win.bottom_offset = get_ue_golomb_long(gb) * 2;

  674. 

  675.         if (s->avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) {

  676.             av_log(s->avctx, AV_LOG_DEBUG,

  677.                    "discarding sps conformance window, "

  678.                    "original values are l:%u r:%u t:%u b:%u\n",

  679.                    sps->pic_conf_win.left_offset,

  680.                    sps->pic_conf_win.right_offset,

  681.                    sps->pic_conf_win.top_offset,

  682.                    sps->pic_conf_win.bottom_offset);

  683. 

  684.             sps->pic_conf_win.left_offset   =

  685.             sps->pic_conf_win.right_offset  =

  686.             sps->pic_conf_win.top_offset    =

  687.             sps->pic_conf_win.bottom_offset = 0;

  688.         }

  689.         sps->output_window = sps->pic_conf_win;

  690.     }

  691. 

  692.     sps->bit_depth   = get_ue_golomb_long(gb) + 8;

  693.     bit_depth_chroma = get_ue_golomb_long(gb) + 8;

  694.     if (bit_depth_chroma != sps->bit_depth) {

  695.         av_log(s->avctx, AV_LOG_ERROR,

  696.                "Luma bit depth (%d) is different from chroma bit depth (%d), "

  697.                "this is unsupported.\n",

  698.                sps->bit_depth, bit_depth_chroma);

  699.         ret = AVERROR_INVALIDDATA;

  700.         goto err;

  701.     }

  702. 

  703.     if (sps->chroma_format_idc == 1) {

  704.         switch (sps->bit_depth) {

  705.         case 8:  sps->pix_fmt = AV_PIX_FMT_YUV420P;   break;

  706.         case 9:  sps->pix_fmt = AV_PIX_FMT_YUV420P9;  break;

  707.         case 10: sps->pix_fmt = AV_PIX_FMT_YUV420P10; break;

  708.         default:

  709.             av_log(s->avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n",

  710.                    sps->bit_depth);

  711.             ret = AVERROR_PATCHWELCOME;

  712.             goto err;

  713.         }

  714.     } else {

  715.         av_log(s->avctx, AV_LOG_ERROR,

  716.                "non-4:2:0 support is currently unspecified.\n");

  717.         return AVERROR_PATCHWELCOME;

  718.     }

  719. 

  720.     desc = av_pix_fmt_desc_get(sps->pix_fmt);

  721.     if (!desc) {

  722.         ret = AVERROR(EINVAL);

  723.         goto err;

  724.     }

  725. 

  726.     sps->hshift[0] = sps->vshift[0] = 0;

  727.     sps->hshift[2] = sps->hshift[1] = desc->log2_chroma_w;

  728.     sps->vshift[2] = sps->vshift[1] = desc->log2_chroma_h;

  729. 

  730.     sps->pixel_shift = sps->bit_depth > 8;

  731. 

  732.     sps->log2_max_poc_lsb = get_ue_golomb_long(gb) + 4;

  733.     if (sps->log2_max_poc_lsb > 16) {

  734.         av_log(s->avctx, AV_LOG_ERROR, "log2_max_pic_order_cnt_lsb_minus4 out range: %d\n",

  735.                sps->log2_max_poc_lsb - 4);

  736.         ret = AVERROR_INVALIDDATA;

  737.         goto err;

  738.     }

  739. 

  740.     sublayer_ordering_info = get_bits1(gb);

  741.     start = sublayer_ordering_info ? 0 : sps->max_sub_layers - 1;

  742.     for (i = start; i < sps->max_sub_layers; i++) {

  743.         sps->temporal_layer[i].max_dec_pic_buffering = get_ue_golomb_long(gb) + 1;

  744.         sps->temporal_layer[i].num_reorder_pics      = get_ue_golomb_long(gb);

  745.         sps->temporal_layer[i].max_latency_increase  = get_ue_golomb_long(gb) - 1;

  746.         if (sps->temporal_layer[i].max_dec_pic_buffering > MAX_DPB_SIZE) {

  747.             av_log(s->avctx, AV_LOG_ERROR, "sps_max_dec_pic_buffering_minus1 out of range: %d\n",

  748.                    sps->temporal_layer[i].max_dec_pic_buffering - 1);

  749.             ret = AVERROR_INVALIDDATA;

  750.             goto err;

  751.         }

  752.         if (sps->temporal_layer[i].num_reorder_pics > sps->temporal_layer[i].max_dec_pic_buffering - 1) {

  753.             av_log(s->avctx, AV_LOG_ERROR, "sps_max_num_reorder_pics out of range: %d\n",

  754.                    sps->temporal_layer[i].num_reorder_pics);

  755.             ret = AVERROR_INVALIDDATA;

  756.             goto err;

  757.         }

  758.     }

  759. 

  760.     if (!sublayer_ordering_info) {

  761.         for (i = 0; i < start; i++) {

  762.             sps->temporal_layer[i].max_dec_pic_buffering = sps->temporal_layer[start].max_dec_pic_buffering;

  763.             sps->temporal_layer[i].num_reorder_pics      = sps->temporal_layer[start].num_reorder_pics;

  764.             sps->temporal_layer[i].max_latency_increase  = sps->temporal_layer[start].max_latency_increase;

  765.         }

  766.     }

  767. 

  768.     sps->log2_min_cb_size                    = get_ue_golomb_long(gb) + 3;

  769.     sps->log2_diff_max_min_coding_block_size = get_ue_golomb_long(gb);

  770.     sps->log2_min_tb_size                    = get_ue_golomb_long(gb) + 2;

  771.     log2_diff_max_min_transform_block_size   = get_ue_golomb_long(gb);

  772.     sps->log2_max_trafo_size                 = log2_diff_max_min_transform_block_size +

  773.                                                sps->log2_min_tb_size;

  774. 

  775.     if (sps->log2_min_tb_size >= sps->log2_min_cb_size) {

  776.         av_log(s->avctx, AV_LOG_ERROR, "Invalid value for log2_min_tb_size");

  777.         ret = AVERROR_INVALIDDATA;

  778.         goto err;

  779.     }

  780.     sps->max_transform_hierarchy_depth_inter = get_ue_golomb_long(gb);

  781.     sps->max_transform_hierarchy_depth_intra = get_ue_golomb_long(gb);

  782. 

  783.     sps->scaling_list_enable_flag = get_bits1(gb);

  784.     if (sps->scaling_list_enable_flag) {

  785.         set_default_scaling_list_data(&sps->scaling_list);

  786. 

  787.         if (get_bits1(gb)) {

  788.             ret = scaling_list_data(s, &sps->scaling_list);

  789.             if (ret < 0)

  790.                 goto err;

  791.         }

  792.     }

  793. 

  794.     sps->amp_enabled_flag = get_bits1(gb);

  795.     sps->sao_enabled      = get_bits1(gb);

  796. 

  797.     sps->pcm_enabled_flag = get_bits1(gb);

  798.     if (sps->pcm_enabled_flag) {

  799.         int pcm_bit_depth_chroma;

  800.         sps->pcm.bit_depth   = get_bits(gb, 4) + 1;

  801.         pcm_bit_depth_chroma = get_bits(gb, 4) + 1;

  802.         if (pcm_bit_depth_chroma != sps->pcm.bit_depth) {

  803.             av_log(s->avctx, AV_LOG_ERROR,

  804.                    "PCM Luma bit depth (%d) is different from PCM chroma"

  805.                    "bit depth (%d), this is unsupported.\n",

  806.                    sps->pcm.bit_depth, pcm_bit_depth_chroma);

  807.             ret = AVERROR_INVALIDDATA;

  808.             goto err;

  809.         }

  810. 

  811.         sps->pcm.log2_min_pcm_cb_size = get_ue_golomb_long(gb) + 3;

  812.         sps->pcm.log2_max_pcm_cb_size = sps->pcm.log2_min_pcm_cb_size +

  813.                                         get_ue_golomb_long(gb);

  814.         if (sps->pcm.bit_depth > sps->bit_depth) {

  815.             av_log(s->avctx, AV_LOG_ERROR,

  816.                    "PCM bit depth (%d) is greater than normal bit depth (%d)\n",

  817.                    sps->pcm.bit_depth, sps->bit_depth);

  818.             ret = AVERROR_INVALIDDATA;

  819.             goto err;

  820.         }

  821. 

  822.         sps->pcm.loop_filter_disable_flag = get_bits1(gb);

  823.     }

  824. 

  825.     sps->nb_st_rps = get_ue_golomb_long(gb);

  826.     if (sps->nb_st_rps > MAX_SHORT_TERM_RPS_COUNT) {

  827.         av_log(s->avctx, AV_LOG_ERROR, "Too many short term RPS: %d.\n",

  828.                sps->nb_st_rps);

  829.         ret = AVERROR_INVALIDDATA;

  830.         goto err;

  831.     }

  832.     for (i = 0; i < sps->nb_st_rps; i++) {

  833.         if ((ret = ff_hevc_decode_short_term_rps(s, &sps->st_rps[i],

  834.                                                  sps, 0)) < 0)

  835.             goto err;

  836.     }

  837. 

  838.     sps->long_term_ref_pics_present_flag = get_bits1(gb);

  839.     if (sps->long_term_ref_pics_present_flag) {

  840.         sps->num_long_term_ref_pics_sps = get_ue_golomb_long(gb);

  841.         for (i = 0; i < sps->num_long_term_ref_pics_sps; i++) {

  842.             sps->lt_ref_pic_poc_lsb_sps[i]       = get_bits(gb, sps->log2_max_poc_lsb);

  843.             sps->used_by_curr_pic_lt_sps_flag[i] = get_bits1(gb);

  844.         }

  845.     }

  846. 

  847.     sps->sps_temporal_mvp_enabled_flag          = get_bits1(gb);

  848.     sps->sps_strong_intra_smoothing_enable_flag = get_bits1(gb);

  849.     sps->vui.sar = (AVRational){0, 1};

  850.     vui_present = get_bits1(gb);

  851.     if (vui_present)

  852.         decode_vui(s, sps);

  853.     skip_bits1(gb); // sps_extension_flag

  854. 

  855.     if (s->apply_defdispwin) {

  856.         sps->output_window.left_offset   += sps->vui.def_disp_win.left_offset;

  857.         sps->output_window.right_offset  += sps->vui.def_disp_win.right_offset;

  858.         sps->output_window.top_offset    += sps->vui.def_disp_win.top_offset;

  859.         sps->output_window.bottom_offset += sps->vui.def_disp_win.bottom_offset;

  860.     }

  861.     if (sps->output_window.left_offset & (0x1F >> (sps->pixel_shift)) &&

  862.         !(s->avctx->flags & CODEC_FLAG_UNALIGNED)) {

  863.         sps->output_window.left_offset &= ~(0x1F >> (sps->pixel_shift));

  864.         av_log(s->avctx, AV_LOG_WARNING, "Reducing left output window to %d "

  865.                "chroma samples to preserve alignment.\n",

  866.                sps->output_window.left_offset);

  867.     }

  868.     sps->output_width  = sps->width -

  869.                          (sps->output_window.left_offset + sps->output_window.right_offset);

  870.     sps->output_height = sps->height -

  871.                          (sps->output_window.top_offset + sps->output_window.bottom_offset);

  872.     if (sps->output_width <= 0 || sps->output_height <= 0) {

  873.         av_log(s->avctx, AV_LOG_WARNING, "Invalid visible frame dimensions: %dx%d.\n",

  874.                sps->output_width, sps->output_height);

  875.         if (s->avctx->err_recognition & AV_EF_EXPLODE) {

  876.             ret = AVERROR_INVALIDDATA;

  877.             goto err;

  878.         }

  879.         av_log(s->avctx, AV_LOG_WARNING,

  880.                "Displaying the whole video surface.\n");

  881.         sps->pic_conf_win.left_offset   =

  882.         sps->pic_conf_win.right_offset  =

  883.         sps->pic_conf_win.top_offset    =

  884.         sps->pic_conf_win.bottom_offset = 0;

  885.         sps->output_width               = sps->width;

  886.         sps->output_height              = sps->height;

  887.     }

  888. 

  889.     // Inferred parameters

  890.     sps->log2_ctb_size = sps->log2_min_cb_size +

  891.                          sps->log2_diff_max_min_coding_block_size;

  892.     sps->log2_min_pu_size = sps->log2_min_cb_size - 1;

  893. 

  894.     sps->ctb_width  = (sps->width  + (1 << sps->log2_ctb_size) - 1) >> sps->log2_ctb_size;

  895.     sps->ctb_height = (sps->height + (1 << sps->log2_ctb_size) - 1) >> sps->log2_ctb_size;

  896.     sps->ctb_size   = sps->ctb_width * sps->ctb_height;

  897. 

  898.     sps->min_cb_width  = sps->width  >> sps->log2_min_cb_size;

  899.     sps->min_cb_height = sps->height >> sps->log2_min_cb_size;

  900.     sps->min_tb_width  = sps->width  >> sps->log2_min_tb_size;

  901.     sps->min_tb_height = sps->height >> sps->log2_min_tb_size;

  902.     sps->min_pu_width  = sps->width  >> sps->log2_min_pu_size;

  903.     sps->min_pu_height = sps->height >> sps->log2_min_pu_size;

  904. 

  905.     sps->qp_bd_offset = 6 * (sps->bit_depth - 8);

  906. 

  907.     if (sps->width  & ((1 << sps->log2_min_cb_size) - 1) ||

  908.         sps->height & ((1 << sps->log2_min_cb_size) - 1)) {

  909.         av_log(s->avctx, AV_LOG_ERROR, "Invalid coded frame dimensions.\n");

  910.         goto err;

  911.     }

  912. 

  913.     if (sps->log2_ctb_size > MAX_LOG2_CTB_SIZE) {

  914.         av_log(s->avctx, AV_LOG_ERROR, "CTB size out of range: 2^%d\n", sps->log2_ctb_size);

  915.         goto err;

  916.     }

  917.     if (sps->max_transform_hierarchy_depth_inter > sps->log2_ctb_size - sps->log2_min_tb_size) {

  918.         av_log(s->avctx, AV_LOG_ERROR, "max_transform_hierarchy_depth_inter out of range: %d\n",

  919.                sps->max_transform_hierarchy_depth_inter);

  920.         goto err;

  921.     }

  922.     if (sps->max_transform_hierarchy_depth_intra > sps->log2_ctb_size - sps->log2_min_tb_size) {

  923.         av_log(s->avctx, AV_LOG_ERROR, "max_transform_hierarchy_depth_intra out of range: %d\n",

  924.                sps->max_transform_hierarchy_depth_intra);

  925.         goto err;

  926.     }

  927.     if (sps->log2_max_trafo_size > FFMIN(sps->log2_ctb_size, 5)) {

  928.         av_log(s->avctx, AV_LOG_ERROR,

  929.                "max transform block size out of range: %d\n",

  930.                sps->log2_max_trafo_size);

  931.         goto err;

  932.     }

  933. 

  934.     if (s->avctx->debug & FF_DEBUG_BITSTREAM) {

  935.         av_log(s->avctx, AV_LOG_DEBUG,

  936.                "Parsed SPS: id %d; coded wxh: %dx%d; "

  937.                "cropped wxh: %dx%d; pix_fmt: %s.\n",

  938.                sps_id, sps->width, sps->height,

  939.                sps->output_width, sps->output_height,

  940.                av_get_pix_fmt_name(sps->pix_fmt));

  941.     }

  942. 

  943.     /* check if this is a repeat of an already parsed SPS, then keep the

  944.      * original one.

  945.      * otherwise drop all PPSes that depend on it */

  946.     if (s->sps_list[sps_id] &&

  947.         !memcmp(s->sps_list[sps_id]->data, sps_buf->data, sps_buf->size)) {

  948.         av_buffer_unref(&sps_buf);

  949.     } else {

  950.         for (i = 0; i < FF_ARRAY_ELEMS(s->pps_list); i++) {

  951.             if (s->pps_list[i] && ((HEVCPPS*)s->pps_list[i]->data)->sps_id == sps_id)

  952.                 av_buffer_unref(&s->pps_list[i]);

  953.         }

  954.         av_buffer_unref(&s->sps_list[sps_id]);

  955.         s->sps_list[sps_id] = sps_buf;

  956.     }

  957. 

  958.     return 0;

  959. 

  960. err:

  961.     av_buffer_unref(&sps_buf);

  962.     return ret;

  963. }

  964. 

  965. static void hevc_pps_free(void *opaque, uint8_t *data)

  966. {

  967.     HEVCPPS *pps = (HEVCPPS*)data;

  968. 

  969.     av_freep(&pps->column_width);

  970.     av_freep(&pps->row_height);

  971.     av_freep(&pps->col_bd);

  972.     av_freep(&pps->row_bd);

  973.     av_freep(&pps->col_idxX);

  974.     av_freep(&pps->ctb_addr_rs_to_ts);

  975.     av_freep(&pps->ctb_addr_ts_to_rs);

  976.     av_freep(&pps->tile_pos_rs);

  977.     av_freep(&pps->tile_id);

  978.     av_freep(&pps->min_cb_addr_zs);

  979.     av_freep(&pps->min_tb_addr_zs);

  980. 

  981.     av_freep(&pps);

  982. }

  983. 

  984. int ff_hevc_decode_nal_pps(HEVCContext *s)

  985. {

  986.     GetBitContext *gb = &s->HEVClc.gb;

  987.     HEVCSPS      *sps = NULL;

  988.     int pic_area_in_ctbs, pic_area_in_min_cbs, pic_area_in_min_tbs;

  989.     int log2_diff_ctb_min_tb_size;

  990.     int i, j, x, y, ctb_addr_rs, tile_id;

  991.     int ret    = 0;

  992.     int pps_id = 0;

  993. 

  994.     AVBufferRef *pps_buf;

  995.     HEVCPPS *pps = av_mallocz(sizeof(*pps));

  996. 

  997.     if (!pps)

  998.         return AVERROR(ENOMEM);

  999. 

  1000.     pps_buf = av_buffer_create((uint8_t *)pps, sizeof(*pps),

  1001.                                hevc_pps_free, NULL, 0);

  1002.     if (!pps_buf) {

  1003.         av_freep(&pps);

  1004.         return AVERROR(ENOMEM);

  1005.     }

  1006. 

  1007.     av_log(s->avctx, AV_LOG_DEBUG, "Decoding PPS\n");

  1008. 

  1009.     // Default values

  1010.     pps->loop_filter_across_tiles_enabled_flag = 1;

  1011.     pps->num_tile_columns                      = 1;

  1012.     pps->num_tile_rows                         = 1;

  1013.     pps->uniform_spacing_flag                  = 1;

  1014.     pps->disable_dbf                           = 0;

  1015.     pps->beta_offset                           = 0;

  1016.     pps->tc_offset                             = 0;

  1017. 

  1018.     // Coded parameters

  1019.     pps_id = get_ue_golomb_long(gb);

  1020.     if (pps_id >= MAX_PPS_COUNT) {

  1021.         av_log(s->avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", pps_id);

  1022.         ret = AVERROR_INVALIDDATA;

  1023.         goto err;

  1024.     }

  1025.     pps->sps_id = get_ue_golomb_long(gb);

  1026.     if (pps->sps_id >= MAX_SPS_COUNT) {

  1027.         av_log(s->avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", pps->sps_id);

  1028.         ret = AVERROR_INVALIDDATA;

  1029.         goto err;

  1030.     }

  1031.     if (!s->sps_list[pps->sps_id]) {

  1032.         av_log(s->avctx, AV_LOG_ERROR, "SPS does not exist \n");

  1033.         ret = AVERROR_INVALIDDATA;

  1034.         goto err;

  1035.     }

  1036.     sps = (HEVCSPS *)s->sps_list[pps->sps_id]->data;

  1037. 

  1038.     pps->dependent_slice_segments_enabled_flag = get_bits1(gb);

  1039.     pps->output_flag_present_flag              = get_bits1(gb);

  1040.     pps->num_extra_slice_header_bits           = get_bits(gb, 3);

  1041. 

  1042.     pps->sign_data_hiding_flag = get_bits1(gb);

  1043. 

  1044.     pps->cabac_init_present_flag = get_bits1(gb);

  1045. 

  1046.     pps->num_ref_idx_l0_default_active = get_ue_golomb_long(gb) + 1;

  1047.     pps->num_ref_idx_l1_default_active = get_ue_golomb_long(gb) + 1;

  1048. 

  1049.     pps->pic_init_qp_minus26 = get_se_golomb(gb);

  1050. 

  1051.     pps->constrained_intra_pred_flag = get_bits1(gb);

  1052.     pps->transform_skip_enabled_flag = get_bits1(gb);

  1053. 

  1054.     pps->cu_qp_delta_enabled_flag = get_bits1(gb);

  1055.     pps->diff_cu_qp_delta_depth   = 0;

  1056.     if (pps->cu_qp_delta_enabled_flag)

  1057.         pps->diff_cu_qp_delta_depth = get_ue_golomb_long(gb);

  1058. 

  1059.     pps->cb_qp_offset = get_se_golomb(gb);

  1060.     if (pps->cb_qp_offset < -12 || pps->cb_qp_offset > 12) {

  1061.         av_log(s->avctx, AV_LOG_ERROR, "pps_cb_qp_offset out of range: %d\n",

  1062.                pps->cb_qp_offset);

  1063.         ret = AVERROR_INVALIDDATA;

  1064.         goto err;

  1065.     }

  1066.     pps->cr_qp_offset = get_se_golomb(gb);

  1067.     if (pps->cr_qp_offset < -12 || pps->cr_qp_offset > 12) {

  1068.         av_log(s->avctx, AV_LOG_ERROR, "pps_cr_qp_offset out of range: %d\n",

  1069.                pps->cr_qp_offset);

  1070.         ret = AVERROR_INVALIDDATA;

  1071.         goto err;

  1072.     }

  1073.     pps->pic_slice_level_chroma_qp_offsets_present_flag = get_bits1(gb);

  1074. 

  1075.     pps->weighted_pred_flag   = get_bits1(gb);

  1076.     pps->weighted_bipred_flag = get_bits1(gb);

  1077. 

  1078.     pps->transquant_bypass_enable_flag    = get_bits1(gb);

  1079.     pps->tiles_enabled_flag               = get_bits1(gb);

  1080.     pps->entropy_coding_sync_enabled_flag = get_bits1(gb);

  1081. 

  1082.     if (pps->tiles_enabled_flag) {

  1083.         pps->num_tile_columns = get_ue_golomb_long(gb) + 1;

  1084.         pps->num_tile_rows    = get_ue_golomb_long(gb) + 1;

  1085.         if (pps->num_tile_columns == 0 ||

  1086.             pps->num_tile_columns >= sps->width) {

  1087.             av_log(s->avctx, AV_LOG_ERROR, "num_tile_columns_minus1 out of range: %d\n",

  1088.                    pps->num_tile_columns - 1);

  1089.             ret = AVERROR_INVALIDDATA;

  1090.             goto err;

  1091.         }

  1092.         if (pps->num_tile_rows == 0 ||

  1093.             pps->num_tile_rows >= sps->height) {

  1094.             av_log(s->avctx, AV_LOG_ERROR, "num_tile_rows_minus1 out of range: %d\n",

  1095.                    pps->num_tile_rows - 1);

  1096.             ret = AVERROR_INVALIDDATA;

  1097.             goto err;

  1098.         }

  1099. 

  1100.         pps->column_width = av_malloc_array(pps->num_tile_columns, sizeof(*pps->column_width));

  1101.         pps->row_height   = av_malloc_array(pps->num_tile_rows,    sizeof(*pps->row_height));

  1102.         if (!pps->column_width || !pps->row_height) {

  1103.             ret = AVERROR(ENOMEM);

  1104.             goto err;

  1105.         }

  1106. 

  1107.         pps->uniform_spacing_flag = get_bits1(gb);

  1108.         if (!pps->uniform_spacing_flag) {

  1109.             int sum = 0;

  1110.             for (i = 0; i < pps->num_tile_columns - 1; i++) {

  1111.                 pps->column_width[i] = get_ue_golomb_long(gb) + 1;

  1112.                 sum                 += pps->column_width[i];

  1113.             }

  1114.             if (sum >= sps->ctb_width) {

  1115.                 av_log(s->avctx, AV_LOG_ERROR, "Invalid tile widths.\n");

  1116.                 ret = AVERROR_INVALIDDATA;

  1117.                 goto err;

  1118.             }

  1119.             pps->column_width[pps->num_tile_columns - 1] = sps->ctb_width - sum;

  1120. 

  1121.             sum = 0;

  1122.             for (i = 0; i < pps->num_tile_rows - 1; i++) {

  1123.                 pps->row_height[i] = get_ue_golomb_long(gb) + 1;

  1124.                 sum               += pps->row_height[i];

  1125.             }

  1126.             if (sum >= sps->ctb_height) {

  1127.                 av_log(s->avctx, AV_LOG_ERROR, "Invalid tile heights.\n");

  1128.                 ret = AVERROR_INVALIDDATA;

  1129.                 goto err;

  1130.             }

  1131.             pps->row_height[pps->num_tile_rows - 1] = sps->ctb_height - sum;

  1132.         }

  1133.         pps->loop_filter_across_tiles_enabled_flag = get_bits1(gb);

  1134.     }

  1135. 

  1136.     pps->seq_loop_filter_across_slices_enabled_flag = get_bits1(gb);

  1137. 

  1138.     pps->deblocking_filter_control_present_flag = get_bits1(gb);

  1139.     if (pps->deblocking_filter_control_present_flag) {

  1140.         pps->deblocking_filter_override_enabled_flag = get_bits1(gb);

  1141.         pps->disable_dbf                             = get_bits1(gb);

  1142.         if (!pps->disable_dbf) {

  1143.             pps->beta_offset = get_se_golomb(gb) * 2;

  1144.             pps->tc_offset = get_se_golomb(gb) * 2;

  1145.             if (pps->beta_offset/2 < -6 || pps->beta_offset/2 > 6) {

  1146.                 av_log(s->avctx, AV_LOG_ERROR, "pps_beta_offset_div2 out of range: %d\n",

  1147.                        pps->beta_offset/2);

  1148.                 ret = AVERROR_INVALIDDATA;

  1149.                 goto err;

  1150.             }

  1151.             if (pps->tc_offset/2 < -6 || pps->tc_offset/2 > 6) {

  1152.                 av_log(s->avctx, AV_LOG_ERROR, "pps_tc_offset_div2 out of range: %d\n",

  1153.                        pps->tc_offset/2);

  1154.                 ret = AVERROR_INVALIDDATA;

  1155.                 goto err;

  1156.             }

  1157.         }

  1158.     }

  1159. 

  1160.     pps->scaling_list_data_present_flag = get_bits1(gb);

  1161.     if (pps->scaling_list_data_present_flag) {

  1162.         set_default_scaling_list_data(&pps->scaling_list);

  1163.         ret = scaling_list_data(s, &pps->scaling_list);

  1164.         if (ret < 0)

  1165.             goto err;

  1166.     }

  1167.     pps->lists_modification_present_flag = get_bits1(gb);

  1168.     pps->log2_parallel_merge_level       = get_ue_golomb_long(gb) + 2;

  1169.     if (pps->log2_parallel_merge_level > sps->log2_ctb_size) {

  1170.         av_log(s->avctx, AV_LOG_ERROR, "log2_parallel_merge_level_minus2 out of range: %d\n",

  1171.                pps->log2_parallel_merge_level - 2);

  1172.         ret = AVERROR_INVALIDDATA;

  1173.         goto err;

  1174.     }

  1175. 

  1176.     pps->slice_header_extension_present_flag = get_bits1(gb);

  1177.     skip_bits1(gb);     // pps_extension_flag

  1178. 

  1179.     // Inferred parameters

  1180.     pps->col_bd   = av_malloc_array(pps->num_tile_columns + 1, sizeof(*pps->col_bd));

  1181.     pps->row_bd   = av_malloc_array(pps->num_tile_rows + 1,    sizeof(*pps->row_bd));

  1182.     pps->col_idxX = av_malloc_array(sps->ctb_width,    sizeof(*pps->col_idxX));

  1183.     if (!pps->col_bd || !pps->row_bd || !pps->col_idxX) {

  1184.         ret = AVERROR(ENOMEM);

  1185.         goto err;

  1186.     }

  1187. 

  1188.     if (pps->uniform_spacing_flag) {

  1189.         if (!pps->column_width) {

  1190.             pps->column_width = av_malloc_array(pps->num_tile_columns, sizeof(*pps->column_width));

  1191.             pps->row_height   = av_malloc_array(pps->num_tile_rows,    sizeof(*pps->row_height));

  1192.         }

  1193.         if (!pps->column_width || !pps->row_height) {

  1194.             ret = AVERROR(ENOMEM);

  1195.             goto err;

  1196.         }

  1197. 

  1198.         for (i = 0; i < pps->num_tile_columns; i++) {

  1199.             pps->column_width[i] = ((i + 1) * sps->ctb_width) / pps->num_tile_columns -

  1200.                                    (i * sps->ctb_width) / pps->num_tile_columns;

  1201.         }

  1202. 

  1203.         for (i = 0; i < pps->num_tile_rows; i++) {

  1204.             pps->row_height[i] = ((i + 1) * sps->ctb_height) / pps->num_tile_rows -

  1205.                                  (i * sps->ctb_height) / pps->num_tile_rows;

  1206.         }

  1207.     }

  1208. 

  1209.     pps->col_bd[0] = 0;

  1210.     for (i = 0; i < pps->num_tile_columns; i++)

  1211.         pps->col_bd[i + 1] = pps->col_bd[i] + pps->column_width[i];

  1212. 

  1213.     pps->row_bd[0] = 0;

  1214.     for (i = 0; i < pps->num_tile_rows; i++)

  1215.         pps->row_bd[i + 1] = pps->row_bd[i] + pps->row_height[i];

  1216. 

  1217.     for (i = 0, j = 0; i < sps->ctb_width; i++) {

  1218.         if (i > pps->col_bd[j])

  1219.             j++;

  1220.         pps->col_idxX[i] = j;

  1221.     }

  1222. 

  1223.     /**

  1224.      * 6.5

  1225.      */

  1226.     pic_area_in_ctbs     = sps->ctb_width    * sps->ctb_height;

  1227.     pic_area_in_min_cbs  = sps->min_cb_width * sps->min_cb_height;

  1228.     pic_area_in_min_tbs  = sps->min_tb_width * sps->min_tb_height;

  1229. 

  1230.     pps->ctb_addr_rs_to_ts = av_malloc_array(pic_area_in_ctbs,    sizeof(*pps->ctb_addr_rs_to_ts));

  1231.     pps->ctb_addr_ts_to_rs = av_malloc_array(pic_area_in_ctbs,    sizeof(*pps->ctb_addr_ts_to_rs));

  1232.     pps->tile_id           = av_malloc_array(pic_area_in_ctbs,    sizeof(*pps->tile_id));

  1233.     pps->min_cb_addr_zs    = av_malloc_array(pic_area_in_min_cbs, sizeof(*pps->min_cb_addr_zs));

  1234.     pps->min_tb_addr_zs    = av_malloc_array(pic_area_in_min_tbs, sizeof(*pps->min_tb_addr_zs));

  1235.     if (!pps->ctb_addr_rs_to_ts || !pps->ctb_addr_ts_to_rs ||

  1236.         !pps->tile_id || !pps->min_cb_addr_zs || !pps->min_tb_addr_zs) {

  1237.         ret = AVERROR(ENOMEM);

  1238.         goto err;

  1239.     }

  1240. 

  1241.     for (ctb_addr_rs = 0; ctb_addr_rs < pic_area_in_ctbs; ctb_addr_rs++) {

  1242.         int tb_x   = ctb_addr_rs % sps->ctb_width;

  1243.         int tb_y   = ctb_addr_rs / sps->ctb_width;

  1244.         int tile_x = 0;

  1245.         int tile_y = 0;

  1246.         int val    = 0;

  1247. 

  1248.         for (i = 0; i < pps->num_tile_columns; i++) {

  1249.             if (tb_x < pps->col_bd[i + 1]) {

  1250.                 tile_x = i;

  1251.                 break;

  1252.             }

  1253.         }

  1254. 

  1255.         for (i = 0; i < pps->num_tile_rows; i++) {

  1256.             if (tb_y < pps->row_bd[i + 1]) {

  1257.                 tile_y = i;

  1258.                 break;

  1259.             }

  1260.         }

  1261. 

  1262.         for (i = 0; i < tile_x; i++)

  1263.             val += pps->row_height[tile_y] * pps->column_width[i];

  1264.         for (i = 0; i < tile_y; i++)

  1265.             val += sps->ctb_width * pps->row_height[i];

  1266. 

  1267.         val += (tb_y - pps->row_bd[tile_y]) * pps->column_width[tile_x] +

  1268.                tb_x - pps->col_bd[tile_x];

  1269. 

  1270.         pps->ctb_addr_rs_to_ts[ctb_addr_rs] = val;

  1271.         pps->ctb_addr_ts_to_rs[val]         = ctb_addr_rs;

  1272.     }

  1273. 

  1274.     for (j = 0, tile_id = 0; j < pps->num_tile_rows; j++)

  1275.         for (i = 0; i < pps->num_tile_columns; i++, tile_id++)

  1276.             for (y = pps->row_bd[j]; y < pps->row_bd[j + 1]; y++)

  1277.                 for (x = pps->col_bd[i]; x < pps->col_bd[i + 1]; x++)

  1278.                     pps->tile_id[pps->ctb_addr_rs_to_ts[y * sps->ctb_width + x]] = tile_id;

  1279. 

  1280.     pps->tile_pos_rs = av_malloc_array(tile_id, sizeof(*pps->tile_pos_rs));

  1281.     if (!pps->tile_pos_rs) {

  1282.         ret = AVERROR(ENOMEM);

  1283.         goto err;

  1284.     }

  1285. 

  1286.     for (j = 0; j < pps->num_tile_rows; j++)

  1287.         for (i = 0; i < pps->num_tile_columns; i++)

  1288.             pps->tile_pos_rs[j * pps->num_tile_columns + i] = pps->row_bd[j] * sps->ctb_width + pps->col_bd[i];

  1289. 

  1290.     for (y = 0; y < sps->min_cb_height; y++) {

  1291.         for (x = 0; x < sps->min_cb_width; x++) {

  1292.             int tb_x        = x >> sps->log2_diff_max_min_coding_block_size;

  1293.             int tb_y        = y >> sps->log2_diff_max_min_coding_block_size;

  1294.             int ctb_addr_rs = sps->ctb_width * tb_y + tb_x;

  1295.             int val         = pps->ctb_addr_rs_to_ts[ctb_addr_rs] <<

  1296.                               (sps->log2_diff_max_min_coding_block_size * 2);

  1297.             for (i = 0; i < sps->log2_diff_max_min_coding_block_size; i++) {

  1298.                 int m = 1 << i;

  1299.                 val += (m & x ? m * m : 0) + (m & y ? 2 * m * m : 0);

  1300.             }

  1301.             pps->min_cb_addr_zs[y * sps->min_cb_width + x] = val;

  1302.         }

  1303.     }

  1304. 

  1305.     log2_diff_ctb_min_tb_size = sps->log2_ctb_size - sps->log2_min_tb_size;

  1306.     for (y = 0; y < sps->min_tb_height; y++) {

  1307.         for (x = 0; x < sps->min_tb_width; x++) {

  1308.             int tb_x        = x >> log2_diff_ctb_min_tb_size;

  1309.             int tb_y        = y >> log2_diff_ctb_min_tb_size;

  1310.             int ctb_addr_rs = sps->ctb_width * tb_y + tb_x;

  1311.             int val         = pps->ctb_addr_rs_to_ts[ctb_addr_rs] <<

  1312.                               (log2_diff_ctb_min_tb_size * 2);

  1313.             for (i = 0; i < log2_diff_ctb_min_tb_size; i++) {

  1314.                 int m = 1 << i;

  1315.                 val += (m & x ? m * m : 0) + (m & y ? 2 * m * m : 0);

  1316.             }

  1317.             pps->min_tb_addr_zs[y * sps->min_tb_width + x] = val;

  1318.         }

  1319.     }

  1320. 

  1321.     av_buffer_unref(&s->pps_list[pps_id]);

  1322.     s->pps_list[pps_id] = pps_buf;

  1323. 

  1324.     return 0;

  1325. 

  1326. err:

  1327.     av_buffer_unref(&pps_buf);

  1328.     return ret;

  1329. }