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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.             unsigned 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. 

  196. static void decode_profile_tier_level(HEVCContext *s, PTLCommon *ptl)

  197. {

  198.     int i;

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

  200. 

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

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

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

  204.     if (ptl->profile_idc == FF_PROFILE_HEVC_MAIN)

  205.         av_log(s->avctx, AV_LOG_DEBUG, "Main profile bitstream\n");

  206.     else if (ptl->profile_idc == FF_PROFILE_HEVC_MAIN_10)

  207.         av_log(s->avctx, AV_LOG_DEBUG, "Main 10 profile bitstream\n");

  208.     else if (ptl->profile_idc == FF_PROFILE_HEVC_MAIN_STILL_PICTURE)

  209.         av_log(s->avctx, AV_LOG_DEBUG, "Main Still Picture profile bitstream\n");

  210.     else

  211.         av_log(s->avctx, AV_LOG_WARNING, "Unknown HEVC profile: %d\n", ptl->profile_idc);

  212. 

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

  214.         ptl->profile_compatibility_flag[i] = get_bits1(gb);

  215.     ptl->progressive_source_flag    = get_bits1(gb);

  216.     ptl->interlaced_source_flag     = get_bits1(gb);

  217.     ptl->non_packed_constraint_flag = get_bits1(gb);

  218.     ptl->frame_only_constraint_flag = get_bits1(gb);

  219. 

  220.     skip_bits(gb, 16); // XXX_reserved_zero_44bits[0..15]

  221.     skip_bits(gb, 16); // XXX_reserved_zero_44bits[16..31]

  222.     skip_bits(gb, 12); // XXX_reserved_zero_44bits[32..43]

  223. }

  224. 

  225. static void parse_ptl(HEVCContext *s, PTL *ptl, int max_num_sub_layers)

  226. {

  227.     int i;

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

  229.     decode_profile_tier_level(s, &ptl->general_ptl);

  230.     ptl->general_ptl.level_idc = get_bits(gb, 8);

  231. 

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

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

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

  235.     }

  236.     if (max_num_sub_layers - 1 > 0)

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

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

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

  240.         if (ptl->sub_layer_profile_present_flag[i])

  241.             decode_profile_tier_level(s, &ptl->sub_layer_ptl[i]);

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

  243.             ptl->sub_layer_ptl[i].level_idc = get_bits(gb, 8);

  244.     }

  245. }

  246. 

  247. static void decode_sublayer_hrd(HEVCContext *s, unsigned int nb_cpb,

  248.                                 int subpic_params_present)

  249. {

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

  251.     int i;

  252. 

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

  254.         get_ue_golomb_long(gb); // bit_rate_value_minus1

  255.         get_ue_golomb_long(gb); // cpb_size_value_minus1

  256. 

  257.         if (subpic_params_present) {

  258.             get_ue_golomb_long(gb); // cpb_size_du_value_minus1

  259.             get_ue_golomb_long(gb); // bit_rate_du_value_minus1

  260.         }

  261.         skip_bits1(gb); // cbr_flag

  262.     }

  263. }

  264. 

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

  266.                        int max_sublayers)

  267. {

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

  269.     int nal_params_present = 0, vcl_params_present = 0;

  270.     int subpic_params_present = 0;

  271.     int i;

  272. 

  273.     if (common_inf_present) {

  274.         nal_params_present = get_bits1(gb);

  275.         vcl_params_present = get_bits1(gb);

  276. 

  277.         if (nal_params_present || vcl_params_present) {

  278.             subpic_params_present = get_bits1(gb);

  279. 

  280.             if (subpic_params_present) {

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

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

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

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

  285.             }

  286. 

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

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

  289. 

  290.             if (subpic_params_present)

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

  292. 

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

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

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

  296.         }

  297.     }

  298. 

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

  300.         int low_delay = 0;

  301.         unsigned int nb_cpb = 1;

  302.         int fixed_rate = get_bits1(gb);

  303. 

  304.         if (!fixed_rate)

  305.             fixed_rate = get_bits1(gb);

  306. 

  307.         if (fixed_rate)

  308.             get_ue_golomb_long(gb);  // elemental_duration_in_tc_minus1

  309.         else

  310.             low_delay = get_bits1(gb);

  311. 

  312.         if (!low_delay)

  313.             nb_cpb = get_ue_golomb_long(gb) + 1;

  314. 

  315.         if (nal_params_present)

  316.             decode_sublayer_hrd(s, nb_cpb, subpic_params_present);

  317.         if (vcl_params_present)

  318.             decode_sublayer_hrd(s, nb_cpb, subpic_params_present);

  319.     }

  320. }

  321. 

  322. int ff_hevc_decode_nal_vps(HEVCContext *s)

  323. {

  324.     int i,j;

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

  326.     int vps_id = 0;

  327.     HEVCVPS *vps;

  328.     AVBufferRef *vps_buf = av_buffer_allocz(sizeof(*vps));

  329. 

  330.     if (!vps_buf)

  331.         return AVERROR(ENOMEM);

  332.     vps = (HEVCVPS*)vps_buf->data;

  333. 

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

  335. 

  336.     vps_id = get_bits(gb, 4);

  337.     if (vps_id >= MAX_VPS_COUNT) {

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

  339.         goto err;

  340.     }

  341. 

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

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

  344.         goto err;

  345.     }

  346. 

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

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

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

  350. 

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

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

  353.         goto err;

  354.     }

  355. 

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

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

  358.                vps->vps_max_sub_layers);

  359.         goto err;

  360.     }

  361. 

  362.     parse_ptl(s, &vps->ptl, vps->vps_max_sub_layers);

  363. 

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

  365. 

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

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

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

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

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

  371. 

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

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

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

  375.             goto err;

  376.         }

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

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

  379.                    vps->vps_num_reorder_pics[i]);

  380.             if (s->avctx->err_recognition & AV_EF_EXPLODE)

  381.                 goto err;

  382.         }

  383.     }

  384. 

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

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

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

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

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

  390. 

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

  392.     if (vps->vps_timing_info_present_flag) {

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

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

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

  396.         if (vps->vps_poc_proportional_to_timing_flag)

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

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

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

  400.             int common_inf_present = 1;

  401. 

  402.             get_ue_golomb_long(gb); // hrd_layer_set_idx

  403.             if (i)

  404.                 common_inf_present = get_bits1(gb);

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

  406.         }

  407.     }

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

  409. 

  410.     av_buffer_unref(&s->vps_list[vps_id]);

  411.     s->vps_list[vps_id] = vps_buf;

  412.     return 0;

  413. 

  414. err:

  415.     av_buffer_unref(&vps_buf);

  416.     return AVERROR_INVALIDDATA;

  417. }

  418. 

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

  420. {

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

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

  423.     int sar_present;

  424. 

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

  426. 

  427.     sar_present = get_bits1(gb);

  428.     if (sar_present) {

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

  430.         if (sar_idx < FF_ARRAY_ELEMS(vui_sar))

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

  432.         else if (sar_idx == 255) {

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

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

  435.         } else

  436.             av_log(s->avctx, AV_LOG_WARNING,

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

  438.     }

  439. 

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

  441.     if (vui->overscan_info_present_flag)

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

  443. 

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

  445.     if (vui->video_signal_type_present_flag) {

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

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

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

  449.         if (vui->video_full_range_flag && sps->pix_fmt == AV_PIX_FMT_YUV420P)

  450.             sps->pix_fmt = AV_PIX_FMT_YUVJ420P;

  451.         if (vui->colour_description_present_flag) {

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

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

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

  455. 

  456.             // Set invalid values to "unspecified"

  457.             if (vui->colour_primaries >= AVCOL_PRI_NB)

  458.                 vui->colour_primaries = AVCOL_PRI_UNSPECIFIED;

  459.             if (vui->transfer_characteristic >= AVCOL_TRC_NB)

  460.                 vui->transfer_characteristic = AVCOL_TRC_UNSPECIFIED;

  461.             if (vui->matrix_coeffs >= AVCOL_SPC_NB)

  462.                 vui->matrix_coeffs = AVCOL_SPC_UNSPECIFIED;

  463.         }

  464.     }

  465. 

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

  467.     if (vui->chroma_loc_info_present_flag) {

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

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

  470.     }

  471. 

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

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

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

  475. 

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

  477.     if (vui->default_display_window_flag) {

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

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

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

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

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

  483. 

  484.         if (s->apply_defdispwin &&

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

  486.             av_log(s->avctx, AV_LOG_DEBUG,

  487.                    "discarding vui default display window, "

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

  489.                    vui->def_disp_win.left_offset,

  490.                    vui->def_disp_win.right_offset,

  491.                    vui->def_disp_win.top_offset,

  492.                    vui->def_disp_win.bottom_offset);

  493. 

  494.             vui->def_disp_win.left_offset   =

  495.             vui->def_disp_win.right_offset  =

  496.             vui->def_disp_win.top_offset    =

  497.             vui->def_disp_win.bottom_offset = 0;

  498.         }

  499.     }

  500. 

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

  502.     if (vui->vui_timing_info_present_flag) {

  503.         vui->vui_num_units_in_tick               = get_bits_long(gb, 32);

  504.         vui->vui_time_scale                      = get_bits_long(gb, 32);

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

  506.         if (vui->vui_poc_proportional_to_timing_flag)

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

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

  509.         if (vui->vui_hrd_parameters_present_flag)

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

  511.     }

  512. 

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

  514.     if (vui->bitstream_restriction_flag) {

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

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

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

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

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

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

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

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

  523.     }

  524. }

  525. 

  526. static void set_default_scaling_list_data(ScalingList *sl)

  527. {

  528.     int matrixId;

  529. 

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

  531.         // 4x4 default is 16

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

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

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

  535.     }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  550. }

  551. 

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

  553. {

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

  555.     uint8_t scaling_list_pred_mode_flag[4][6];

  556.     int32_t scaling_list_dc_coef[2][6];

  557.     int size_id, matrix_id, i, pos;

  558. 

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

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

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

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

  563.                 unsigned int delta = get_ue_golomb_long(gb);

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

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

  566.                 if (delta) {

  567.                     // Copy from previous array.

  568.                     if (matrix_id < delta) {

  569.                         av_log(s->avctx, AV_LOG_ERROR,

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

  571.                         return AVERROR_INVALIDDATA;

  572.                     }

  573. 

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

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

  576.                            size_id > 0 ? 64 : 16);

  577.                     if (size_id > 1)

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

  579.                 }

  580.             } else {

  581.                 int next_coef, coef_num;

  582.                 int32_t scaling_list_delta_coef;

  583. 

  584.                 next_coef = 8;

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

  586.                 if (size_id > 1) {

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

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

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

  590.                 }

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

  592.                     if (size_id == 0)

  593.                         pos = 4 * ff_hevc_diag_scan4x4_y[i] +

  594.                                   ff_hevc_diag_scan4x4_x[i];

  595.                     else

  596.                         pos = 8 * ff_hevc_diag_scan8x8_y[i] +

  597.                                   ff_hevc_diag_scan8x8_x[i];

  598. 

  599.                     scaling_list_delta_coef = get_se_golomb(gb);

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

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

  602.                 }

  603.             }

  604.         }

  605. 

  606.     return 0;

  607. }

  608. 

  609. int ff_hevc_decode_nal_sps(HEVCContext *s)

  610. {

  611.     const AVPixFmtDescriptor *desc;

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

  613.     int ret = 0;

  614.     unsigned int sps_id = 0;

  615.     int log2_diff_max_min_transform_block_size;

  616.     int bit_depth_chroma, start, vui_present, sublayer_ordering_info;

  617.     int i;

  618. 

  619.     HEVCSPS *sps;

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

  621. 

  622.     if (!sps_buf)

  623.         return AVERROR(ENOMEM);

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

  625. 

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

  627. 

  628.     // Coded parameters

  629. 

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

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

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

  633.         ret = AVERROR_INVALIDDATA;

  634.         goto err;

  635.     }

  636. 

  637.     if (!s->vps_list[sps->vps_id]) {

  638.         av_log(s->avctx, AV_LOG_ERROR, "VPS %d does not exist\n",

  639.                sps->vps_id);

  640.         ret = AVERROR_INVALIDDATA;

  641.         goto err;

  642.     }

  643. 

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

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

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

  647.                sps->max_sub_layers);

  648.         ret = AVERROR_INVALIDDATA;

  649.         goto err;

  650.     }

  651. 

  652.     skip_bits1(gb); // temporal_id_nesting_flag

  653. 

  654.     parse_ptl(s, &sps->ptl, sps->max_sub_layers);

  655. 

  656.     sps_id = get_ue_golomb_long(gb);

  657.     if (sps_id >= MAX_SPS_COUNT) {

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

  659.         ret = AVERROR_INVALIDDATA;

  660.         goto err;

  661.     }

  662. 

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

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

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

  666.         ret = AVERROR_PATCHWELCOME;

  667.         goto err;

  668.     }

  669. 

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

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

  672. 

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

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

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

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

  677.         goto err;

  678. 

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

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

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

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

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

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

  685. 

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

  687.             av_log(s->avctx, AV_LOG_DEBUG,

  688.                    "discarding sps conformance window, "

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

  690.                    sps->pic_conf_win.left_offset,

  691.                    sps->pic_conf_win.right_offset,

  692.                    sps->pic_conf_win.top_offset,

  693.                    sps->pic_conf_win.bottom_offset);

  694. 

  695.             sps->pic_conf_win.left_offset   =

  696.             sps->pic_conf_win.right_offset  =

  697.             sps->pic_conf_win.top_offset    =

  698.             sps->pic_conf_win.bottom_offset = 0;

  699.         }

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

  701.     }

  702. 

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

  704.     bit_depth_chroma = get_ue_golomb_long(gb) + 8;

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

  706.         av_log(s->avctx, AV_LOG_ERROR,

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

  708.                "this is unsupported.\n",

  709.                sps->bit_depth, bit_depth_chroma);

  710.         ret = AVERROR_INVALIDDATA;

  711.         goto err;

  712.     }

  713. 

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

  715.         switch (sps->bit_depth) {

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

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

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

  719.         default:

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

  721.                    sps->bit_depth);

  722.             ret = AVERROR_PATCHWELCOME;

  723.             goto err;

  724.         }

  725.     } else {

  726.         av_log(s->avctx, AV_LOG_ERROR,

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

  728.         return AVERROR_PATCHWELCOME;

  729.     }

  730. 

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

  732.     if (!desc) {

  733.         ret = AVERROR(EINVAL);

  734.         goto err;

  735.     }

  736. 

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

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

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

  740. 

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

  742. 

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

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

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

  746.                sps->log2_max_poc_lsb - 4);

  747.         ret = AVERROR_INVALIDDATA;

  748.         goto err;

  749.     }

  750. 

  751.     sublayer_ordering_info = get_bits1(gb);

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

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

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

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

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

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

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

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

  760.             ret = AVERROR_INVALIDDATA;

  761.             goto err;

  762.         }

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

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

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

  766.             if (s->avctx->err_recognition & AV_EF_EXPLODE ||

  767.                 sps->temporal_layer[i].num_reorder_pics > MAX_DPB_SIZE - 1) {

  768.                 ret = AVERROR_INVALIDDATA;

  769.                 goto err;

  770.             }

  771.             sps->temporal_layer[i].max_dec_pic_buffering = sps->temporal_layer[i].num_reorder_pics + 1;

  772.         }

  773.     }

  774. 

  775.     if (!sublayer_ordering_info) {

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

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

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

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

  780.         }

  781.     }

  782. 

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

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

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

  786.     log2_diff_max_min_transform_block_size   = get_ue_golomb_long(gb);

  787.     sps->log2_max_trafo_size                 = log2_diff_max_min_transform_block_size +

  788.                                                sps->log2_min_tb_size;

  789. 

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

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

  792.         ret = AVERROR_INVALIDDATA;

  793.         goto err;

  794.     }

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

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

  797. 

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

  799.     if (sps->scaling_list_enable_flag) {

  800.         set_default_scaling_list_data(&sps->scaling_list);

  801. 

  802.         if (get_bits1(gb)) {

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

  804.             if (ret < 0)

  805.                 goto err;

  806.         }

  807.     }

  808. 

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

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

  811. 

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

  813.     if (sps->pcm_enabled_flag) {

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

  815.         sps->pcm.bit_depth_chroma = get_bits(gb, 4) + 1;

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

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

  818.                                         get_ue_golomb_long(gb);

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

  820.             av_log(s->avctx, AV_LOG_ERROR,

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

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

  823.             ret = AVERROR_INVALIDDATA;

  824.             goto err;

  825.         }

  826. 

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

  828.     }

  829. 

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

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

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

  833.                sps->nb_st_rps);

  834.         ret = AVERROR_INVALIDDATA;

  835.         goto err;

  836.     }

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

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

  839.                                                  sps, 0)) < 0)

  840.             goto err;

  841.     }

  842. 

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

  844.     if (sps->long_term_ref_pics_present_flag) {

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

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

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

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

  849.         }

  850.     }

  851. 

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

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

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

  855.     vui_present = get_bits1(gb);

  856.     if (vui_present)

  857.         decode_vui(s, sps);

  858.     skip_bits1(gb); // sps_extension_flag

  859. 

  860.     if (s->apply_defdispwin) {

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

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

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

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

  865.     }

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

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

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

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

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

  871.                sps->output_window.left_offset);

  872.     }

  873.     sps->output_width  = sps->width -

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

  875.     sps->output_height = sps->height -

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

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

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

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

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

  881.             ret = AVERROR_INVALIDDATA;

  882.             goto err;

  883.         }

  884.         av_log(s->avctx, AV_LOG_WARNING,

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

  886.         sps->output_window.left_offset   =

  887.         sps->output_window.right_offset  =

  888.         sps->output_window.top_offset    =

  889.         sps->output_window.bottom_offset = 0;

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

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

  892.     }

  893. 

  894.     // Inferred parameters

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

  896.                          sps->log2_diff_max_min_coding_block_size;

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

  898. 

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

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

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

  902. 

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

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

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

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

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

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

  909. 

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

  911. 

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

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

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

  915.         goto err;

  916.     }

  917. 

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

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

  920.         goto err;

  921.     }

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

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

  924.                sps->max_transform_hierarchy_depth_inter);

  925.         goto err;

  926.     }

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

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

  929.                sps->max_transform_hierarchy_depth_intra);

  930.         goto err;

  931.     }

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

  933.         av_log(s->avctx, AV_LOG_ERROR,

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

  935.                sps->log2_max_trafo_size);

  936.         goto err;

  937.     }

  938. 

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

  940.         av_log(s->avctx, AV_LOG_DEBUG,

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

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

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

  944.                sps->output_width, sps->output_height,

  945.                av_get_pix_fmt_name(sps->pix_fmt));

  946.     }

  947. 

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

  949.      * original one.

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

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

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

  953.         av_buffer_unref(&sps_buf);

  954.     } else {

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

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

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

  958.         }

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

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

  961.     }

  962. 

  963.     return 0;

  964. 

  965. err:

  966.     av_buffer_unref(&sps_buf);

  967.     return ret;

  968. }

  969. 

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

  971. {

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

  973. 

  974.     av_freep(&pps->column_width);

  975.     av_freep(&pps->row_height);

  976.     av_freep(&pps->col_bd);

  977.     av_freep(&pps->row_bd);

  978.     av_freep(&pps->col_idxX);

  979.     av_freep(&pps->ctb_addr_rs_to_ts);

  980.     av_freep(&pps->ctb_addr_ts_to_rs);

  981.     av_freep(&pps->tile_pos_rs);

  982.     av_freep(&pps->tile_id);

  983.     av_freep(&pps->min_tb_addr_zs);

  984. 

  985.     av_freep(&pps);

  986. }

  987. 

  988. int ff_hevc_decode_nal_pps(HEVCContext *s)

  989. {

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

  991.     HEVCSPS      *sps = NULL;

  992.     int pic_area_in_ctbs, pic_area_in_min_tbs;

  993.     int log2_diff_ctb_min_tb_size;

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

  995.     int ret = 0;

  996.     unsigned int pps_id = 0;

  997. 

  998.     AVBufferRef *pps_buf;

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

  1000. 

  1001.     if (!pps)

  1002.         return AVERROR(ENOMEM);

  1003. 

  1004.     pps_buf = av_buffer_create((uint8_t *)pps, sizeof(*pps),

  1005.                                hevc_pps_free, NULL, 0);

  1006.     if (!pps_buf) {

  1007.         av_freep(&pps);

  1008.         return AVERROR(ENOMEM);

  1009.     }

  1010. 

  1011.     av_log(s->avctx, AV_LOG_DEBUG, "Decoding PPS\n");

  1012. 

  1013.     // Default values

  1014.     pps->loop_filter_across_tiles_enabled_flag = 1;

  1015.     pps->num_tile_columns                      = 1;

  1016.     pps->num_tile_rows                         = 1;

  1017.     pps->uniform_spacing_flag                  = 1;

  1018.     pps->disable_dbf                           = 0;

  1019.     pps->beta_offset                           = 0;

  1020.     pps->tc_offset                             = 0;

  1021. 

  1022.     // Coded parameters

  1023.     pps_id = get_ue_golomb_long(gb);

  1024.     if (pps_id >= MAX_PPS_COUNT) {

  1025.         av_log(s->avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", pps_id);

  1026.         ret = AVERROR_INVALIDDATA;

  1027.         goto err;

  1028.     }

  1029.     pps->sps_id = get_ue_golomb_long(gb);

  1030.     if (pps->sps_id >= MAX_SPS_COUNT) {

  1031.         av_log(s->avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", pps->sps_id);

  1032.         ret = AVERROR_INVALIDDATA;

  1033.         goto err;

  1034.     }

  1035.     if (!s->sps_list[pps->sps_id]) {

  1036.         av_log(s->avctx, AV_LOG_ERROR, "SPS %u does not exist.\n", pps->sps_id);

  1037.         ret = AVERROR_INVALIDDATA;

  1038.         goto err;

  1039.     }

  1040.     sps = (HEVCSPS *)s->sps_list[pps->sps_id]->data;

  1041. 

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

  1043.     pps->output_flag_present_flag              = get_bits1(gb);

  1044.     pps->num_extra_slice_header_bits           = get_bits(gb, 3);

  1045. 

  1046.     pps->sign_data_hiding_flag = get_bits1(gb);

  1047. 

  1048.     pps->cabac_init_present_flag = get_bits1(gb);

  1049. 

  1050.     pps->num_ref_idx_l0_default_active = get_ue_golomb_long(gb) + 1;

  1051.     pps->num_ref_idx_l1_default_active = get_ue_golomb_long(gb) + 1;

  1052. 

  1053.     pps->pic_init_qp_minus26 = get_se_golomb(gb);

  1054. 

  1055.     pps->constrained_intra_pred_flag = get_bits1(gb);

  1056.     pps->transform_skip_enabled_flag = get_bits1(gb);

  1057. 

  1058.     pps->cu_qp_delta_enabled_flag = get_bits1(gb);

  1059.     pps->diff_cu_qp_delta_depth   = 0;

  1060.     if (pps->cu_qp_delta_enabled_flag)

  1061.         pps->diff_cu_qp_delta_depth = get_ue_golomb_long(gb);

  1062. 

  1063.     pps->cb_qp_offset = get_se_golomb(gb);

  1064.     if (pps->cb_qp_offset < -12 || pps->cb_qp_offset > 12) {

  1065.         av_log(s->avctx, AV_LOG_ERROR, "pps_cb_qp_offset out of range: %d\n",

  1066.                pps->cb_qp_offset);

  1067.         ret = AVERROR_INVALIDDATA;

  1068.         goto err;

  1069.     }

  1070.     pps->cr_qp_offset = get_se_golomb(gb);

  1071.     if (pps->cr_qp_offset < -12 || pps->cr_qp_offset > 12) {

  1072.         av_log(s->avctx, AV_LOG_ERROR, "pps_cr_qp_offset out of range: %d\n",

  1073.                pps->cr_qp_offset);

  1074.         ret = AVERROR_INVALIDDATA;

  1075.         goto err;

  1076.     }

  1077.     pps->pic_slice_level_chroma_qp_offsets_present_flag = get_bits1(gb);

  1078. 

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

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

  1081. 

  1082.     pps->transquant_bypass_enable_flag    = get_bits1(gb);

  1083.     pps->tiles_enabled_flag               = get_bits1(gb);

  1084.     pps->entropy_coding_sync_enabled_flag = get_bits1(gb);

  1085. 

  1086.     if (pps->tiles_enabled_flag) {

  1087.         pps->num_tile_columns = get_ue_golomb_long(gb) + 1;

  1088.         pps->num_tile_rows    = get_ue_golomb_long(gb) + 1;

  1089.         if (pps->num_tile_columns == 0 ||

  1090.             pps->num_tile_columns >= sps->width) {

  1091.             av_log(s->avctx, AV_LOG_ERROR, "num_tile_columns_minus1 out of range: %d\n",

  1092.                    pps->num_tile_columns - 1);

  1093.             ret = AVERROR_INVALIDDATA;

  1094.             goto err;

  1095.         }

  1096.         if (pps->num_tile_rows == 0 ||

  1097.             pps->num_tile_rows >= sps->height) {

  1098.             av_log(s->avctx, AV_LOG_ERROR, "num_tile_rows_minus1 out of range: %d\n",

  1099.                    pps->num_tile_rows - 1);

  1100.             ret = AVERROR_INVALIDDATA;

  1101.             goto err;

  1102.         }

  1103. 

  1104.         pps->column_width = av_malloc_array(pps->num_tile_columns, sizeof(*pps->column_width));

  1105.         pps->row_height   = av_malloc_array(pps->num_tile_rows,    sizeof(*pps->row_height));

  1106.         if (!pps->column_width || !pps->row_height) {

  1107.             ret = AVERROR(ENOMEM);

  1108.             goto err;

  1109.         }

  1110. 

  1111.         pps->uniform_spacing_flag = get_bits1(gb);

  1112.         if (!pps->uniform_spacing_flag) {

  1113.             uint64_t sum = 0;

  1114.             for (i = 0; i < pps->num_tile_columns - 1; i++) {

  1115.                 pps->column_width[i] = get_ue_golomb_long(gb) + 1;

  1116.                 sum                 += pps->column_width[i];

  1117.             }

  1118.             if (sum >= sps->ctb_width) {

  1119.                 av_log(s->avctx, AV_LOG_ERROR, "Invalid tile widths.\n");

  1120.                 ret = AVERROR_INVALIDDATA;

  1121.                 goto err;

  1122.             }

  1123.             pps->column_width[pps->num_tile_columns - 1] = sps->ctb_width - sum;

  1124. 

  1125.             sum = 0;

  1126.             for (i = 0; i < pps->num_tile_rows - 1; i++) {

  1127.                 pps->row_height[i] = get_ue_golomb_long(gb) + 1;

  1128.                 sum               += pps->row_height[i];

  1129.             }

  1130.             if (sum >= sps->ctb_height) {

  1131.                 av_log(s->avctx, AV_LOG_ERROR, "Invalid tile heights.\n");

  1132.                 ret = AVERROR_INVALIDDATA;

  1133.                 goto err;

  1134.             }

  1135.             pps->row_height[pps->num_tile_rows - 1] = sps->ctb_height - sum;

  1136.         }

  1137.         pps->loop_filter_across_tiles_enabled_flag = get_bits1(gb);

  1138.     }

  1139. 

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

  1141. 

  1142.     pps->deblocking_filter_control_present_flag = get_bits1(gb);

  1143.     if (pps->deblocking_filter_control_present_flag) {

  1144.         pps->deblocking_filter_override_enabled_flag = get_bits1(gb);

  1145.         pps->disable_dbf                             = get_bits1(gb);

  1146.         if (!pps->disable_dbf) {

  1147.             pps->beta_offset = get_se_golomb(gb) * 2;

  1148.             pps->tc_offset = get_se_golomb(gb) * 2;

  1149.             if (pps->beta_offset/2 < -6 || pps->beta_offset/2 > 6) {

  1150.                 av_log(s->avctx, AV_LOG_ERROR, "pps_beta_offset_div2 out of range: %d\n",

  1151.                        pps->beta_offset/2);

  1152.                 ret = AVERROR_INVALIDDATA;

  1153.                 goto err;

  1154.             }

  1155.             if (pps->tc_offset/2 < -6 || pps->tc_offset/2 > 6) {

  1156.                 av_log(s->avctx, AV_LOG_ERROR, "pps_tc_offset_div2 out of range: %d\n",

  1157.                        pps->tc_offset/2);

  1158.                 ret = AVERROR_INVALIDDATA;

  1159.                 goto err;

  1160.             }

  1161.         }

  1162.     }

  1163. 

  1164.     pps->scaling_list_data_present_flag = get_bits1(gb);

  1165.     if (pps->scaling_list_data_present_flag) {

  1166.         set_default_scaling_list_data(&pps->scaling_list);

  1167.         ret = scaling_list_data(s, &pps->scaling_list);

  1168.         if (ret < 0)

  1169.             goto err;

  1170.     }

  1171.     pps->lists_modification_present_flag = get_bits1(gb);

  1172.     pps->log2_parallel_merge_level       = get_ue_golomb_long(gb) + 2;

  1173.     if (pps->log2_parallel_merge_level > sps->log2_ctb_size) {

  1174.         av_log(s->avctx, AV_LOG_ERROR, "log2_parallel_merge_level_minus2 out of range: %d\n",

  1175.                pps->log2_parallel_merge_level - 2);

  1176.         ret = AVERROR_INVALIDDATA;

  1177.         goto err;

  1178.     }

  1179. 

  1180.     pps->slice_header_extension_present_flag = get_bits1(gb);

  1181.     skip_bits1(gb);     // pps_extension_flag

  1182. 

  1183.     // Inferred parameters

  1184.     pps->col_bd   = av_malloc_array(pps->num_tile_columns + 1, sizeof(*pps->col_bd));

  1185.     pps->row_bd   = av_malloc_array(pps->num_tile_rows + 1,    sizeof(*pps->row_bd));

  1186.     pps->col_idxX = av_malloc_array(sps->ctb_width,    sizeof(*pps->col_idxX));

  1187.     if (!pps->col_bd || !pps->row_bd || !pps->col_idxX) {

  1188.         ret = AVERROR(ENOMEM);

  1189.         goto err;

  1190.     }

  1191. 

  1192.     if (pps->uniform_spacing_flag) {

  1193.         if (!pps->column_width) {

  1194.             pps->column_width = av_malloc_array(pps->num_tile_columns, sizeof(*pps->column_width));

  1195.             pps->row_height   = av_malloc_array(pps->num_tile_rows,    sizeof(*pps->row_height));

  1196.         }

  1197.         if (!pps->column_width || !pps->row_height) {

  1198.             ret = AVERROR(ENOMEM);

  1199.             goto err;

  1200.         }

  1201. 

  1202.         for (i = 0; i < pps->num_tile_columns; i++) {

  1203.             pps->column_width[i] = ((i + 1) * sps->ctb_width) / pps->num_tile_columns -

  1204.                                    (i * sps->ctb_width) / pps->num_tile_columns;

  1205.         }

  1206. 

  1207.         for (i = 0; i < pps->num_tile_rows; i++) {

  1208.             pps->row_height[i] = ((i + 1) * sps->ctb_height) / pps->num_tile_rows -

  1209.                                  (i * sps->ctb_height) / pps->num_tile_rows;

  1210.         }

  1211.     }

  1212. 

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

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

  1215.         pps->col_bd[i + 1] = pps->col_bd[i] + pps->column_width[i];

  1216. 

  1217.     pps->row_bd[0] = 0;

  1218.     for (i = 0; i < pps->num_tile_rows; i++)

  1219.         pps->row_bd[i + 1] = pps->row_bd[i] + pps->row_height[i];

  1220. 

  1221.     for (i = 0, j = 0; i < sps->ctb_width; i++) {

  1222.         if (i > pps->col_bd[j])

  1223.             j++;

  1224.         pps->col_idxX[i] = j;

  1225.     }

  1226. 

  1227.     /**

  1228.      * 6.5

  1229.      */

  1230.     pic_area_in_ctbs     = sps->ctb_width    * sps->ctb_height;

  1231.     pic_area_in_min_tbs  = sps->min_tb_width * sps->min_tb_height;

  1232. 

  1233.     pps->ctb_addr_rs_to_ts = av_malloc_array(pic_area_in_ctbs,    sizeof(*pps->ctb_addr_rs_to_ts));

  1234.     pps->ctb_addr_ts_to_rs = av_malloc_array(pic_area_in_ctbs,    sizeof(*pps->ctb_addr_ts_to_rs));

  1235.     pps->tile_id           = av_malloc_array(pic_area_in_ctbs,    sizeof(*pps->tile_id));

  1236.     pps->min_tb_addr_zs    = av_malloc_array(pic_area_in_min_tbs, sizeof(*pps->min_tb_addr_zs));

  1237.     if (!pps->ctb_addr_rs_to_ts || !pps->ctb_addr_ts_to_rs ||

  1238.         !pps->tile_id || !pps->min_tb_addr_zs) {

  1239.         ret = AVERROR(ENOMEM);

  1240.         goto err;

  1241.     }

  1242. 

  1243.     for (ctb_addr_rs = 0; ctb_addr_rs < pic_area_in_ctbs; ctb_addr_rs++) {

  1244.         int tb_x   = ctb_addr_rs % sps->ctb_width;

  1245.         int tb_y   = ctb_addr_rs / sps->ctb_width;

  1246.         int tile_x = 0;

  1247.         int tile_y = 0;

  1248.         int val    = 0;

  1249. 

  1250.         for (i = 0; i < pps->num_tile_columns; i++) {

  1251.             if (tb_x < pps->col_bd[i + 1]) {

  1252.                 tile_x = i;

  1253.                 break;

  1254.             }

  1255.         }

  1256. 

  1257.         for (i = 0; i < pps->num_tile_rows; i++) {

  1258.             if (tb_y < pps->row_bd[i + 1]) {

  1259.                 tile_y = i;

  1260.                 break;

  1261.             }

  1262.         }

  1263. 

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

  1265.             val += pps->row_height[tile_y] * pps->column_width[i];

  1266.         for (i = 0; i < tile_y; i++)

  1267.             val += sps->ctb_width * pps->row_height[i];

  1268. 

  1269.         val += (tb_y - pps->row_bd[tile_y]) * pps->column_width[tile_x] +

  1270.                tb_x - pps->col_bd[tile_x];

  1271. 

  1272.         pps->ctb_addr_rs_to_ts[ctb_addr_rs] = val;

  1273.         pps->ctb_addr_ts_to_rs[val]         = ctb_addr_rs;

  1274.     }

  1275. 

  1276.     for (j = 0, tile_id = 0; j < pps->num_tile_rows; j++)

  1277.         for (i = 0; i < pps->num_tile_columns; i++, tile_id++)

  1278.             for (y = pps->row_bd[j]; y < pps->row_bd[j + 1]; y++)

  1279.                 for (x = pps->col_bd[i]; x < pps->col_bd[i + 1]; x++)

  1280.                     pps->tile_id[pps->ctb_addr_rs_to_ts[y * sps->ctb_width + x]] = tile_id;

  1281. 

  1282.     pps->tile_pos_rs = av_malloc_array(tile_id, sizeof(*pps->tile_pos_rs));

  1283.     if (!pps->tile_pos_rs) {

  1284.         ret = AVERROR(ENOMEM);

  1285.         goto err;

  1286.     }

  1287. 

  1288.     for (j = 0; j < pps->num_tile_rows; j++)

  1289.         for (i = 0; i < pps->num_tile_columns; i++)

  1290.             pps->tile_pos_rs[j * pps->num_tile_columns + i] = pps->row_bd[j] * sps->ctb_width + pps->col_bd[i];

  1291. 

  1292.     log2_diff_ctb_min_tb_size = sps->log2_ctb_size - sps->log2_min_tb_size;

  1293.     for (y = 0; y < sps->min_tb_height; y++) {

  1294.         for (x = 0; x < sps->min_tb_width; x++) {

  1295.             int tb_x        = x >> log2_diff_ctb_min_tb_size;

  1296.             int tb_y        = y >> log2_diff_ctb_min_tb_size;

  1297.             int ctb_addr_rs = sps->ctb_width * tb_y + tb_x;

  1298.             int val         = pps->ctb_addr_rs_to_ts[ctb_addr_rs] <<

  1299.                               (log2_diff_ctb_min_tb_size * 2);

  1300.             for (i = 0; i < log2_diff_ctb_min_tb_size; i++) {

  1301.                 int m = 1 << i;

  1302.                 val += (m & x ? m * m : 0) + (m & y ? 2 * m * m : 0);

  1303.             }

  1304.             pps->min_tb_addr_zs[y * sps->min_tb_width + x] = val;

  1305.         }

  1306.     }

  1307. 

  1308.     av_buffer_unref(&s->pps_list[pps_id]);

  1309.     s->pps_list[pps_id] = pps_buf;

  1310. 

  1311.     return 0;

  1312. 

  1313. err:

  1314.     av_buffer_unref(&pps_buf);

  1315.     return ret;

  1316. }