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  1. /*
  2.  * H.26L/H.264/AVC/JVT/14496-10/... parameter set decoding
  3.  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * H.264 / AVC / MPEG4 part10 parameter set decoding.
  25.  * @author Michael Niedermayer <michaelni@gmx.at>
  26.  */
  27.  
  28. #include <inttypes.h>
  29.  
  30. #include "libavutil/imgutils.h"
  31. #include "internal.h"
  32. #include "avcodec.h"
  33. #include "h264.h"
  34. #include "h264data.h"
  35. #include "golomb.h"
  36.  
  37. #define MAX_LOG2_MAX_FRAME_NUM    (12 + 4)
  38. #define MIN_LOG2_MAX_FRAME_NUM    4
  39.  
  40. #define QP(qP, depth) ((qP) + 6 * ((depth) - 8))
  41.  
  42. #define CHROMA_QP_TABLE_END(d)                                          \
  43.     QP(0,  d), QP(1,  d), QP(2,  d), QP(3,  d), QP(4,  d), QP(5,  d),   \
  44.     QP(6,  d), QP(7,  d), QP(8,  d), QP(9,  d), QP(10, d), QP(11, d),   \
  45.     QP(12, d), QP(13, d), QP(14, d), QP(15, d), QP(16, d), QP(17, d),   \
  46.     QP(18, d), QP(19, d), QP(20, d), QP(21, d), QP(22, d), QP(23, d),   \
  47.     QP(24, d), QP(25, d), QP(26, d), QP(27, d), QP(28, d), QP(29, d),   \
  48.     QP(29, d), QP(30, d), QP(31, d), QP(32, d), QP(32, d), QP(33, d),   \
  49.     QP(34, d), QP(34, d), QP(35, d), QP(35, d), QP(36, d), QP(36, d),   \
  50.     QP(37, d), QP(37, d), QP(37, d), QP(38, d), QP(38, d), QP(38, d),   \
  51.     QP(39, d), QP(39, d), QP(39, d), QP(39, d)
  52.  
  53. const uint8_t ff_h264_chroma_qp[7][QP_MAX_NUM + 1] = {
  54.     { CHROMA_QP_TABLE_END(8) },
  55.     { 0, 1, 2, 3, 4, 5,
  56.       CHROMA_QP_TABLE_END(9) },
  57.     { 0, 1, 2, 3,  4,  5,
  58.       6, 7, 8, 9, 10, 11,
  59.       CHROMA_QP_TABLE_END(10) },
  60.     { 0,  1, 2, 3,  4,  5,
  61.       6,  7, 8, 9, 10, 11,
  62.       12,13,14,15, 16, 17,
  63.       CHROMA_QP_TABLE_END(11) },
  64.     { 0,  1, 2, 3,  4,  5,
  65.       6,  7, 8, 9, 10, 11,
  66.       12,13,14,15, 16, 17,
  67.       18,19,20,21, 22, 23,
  68.       CHROMA_QP_TABLE_END(12) },
  69.     { 0,  1, 2, 3,  4,  5,
  70.       6,  7, 8, 9, 10, 11,
  71.       12,13,14,15, 16, 17,
  72.       18,19,20,21, 22, 23,
  73.       24,25,26,27, 28, 29,
  74.       CHROMA_QP_TABLE_END(13) },
  75.     { 0,  1, 2, 3,  4,  5,
  76.       6,  7, 8, 9, 10, 11,
  77.       12,13,14,15, 16, 17,
  78.       18,19,20,21, 22, 23,
  79.       24,25,26,27, 28, 29,
  80.       30,31,32,33, 34, 35,
  81.       CHROMA_QP_TABLE_END(14) },
  82. };
  83.  
  84. static const uint8_t default_scaling4[2][16] = {
  85.     {  6, 13, 20, 28, 13, 20, 28, 32,
  86.       20, 28, 32, 37, 28, 32, 37, 42 },
  87.     { 10, 14, 20, 24, 14, 20, 24, 27,
  88.       20, 24, 27, 30, 24, 27, 30, 34 }
  89. };
  90.  
  91. static const uint8_t default_scaling8[2][64] = {
  92.     {  6, 10, 13, 16, 18, 23, 25, 27,
  93.       10, 11, 16, 18, 23, 25, 27, 29,
  94.       13, 16, 18, 23, 25, 27, 29, 31,
  95.       16, 18, 23, 25, 27, 29, 31, 33,
  96.       18, 23, 25, 27, 29, 31, 33, 36,
  97.       23, 25, 27, 29, 31, 33, 36, 38,
  98.       25, 27, 29, 31, 33, 36, 38, 40,
  99.       27, 29, 31, 33, 36, 38, 40, 42 },
  100.     {  9, 13, 15, 17, 19, 21, 22, 24,
  101.       13, 13, 17, 19, 21, 22, 24, 25,
  102.       15, 17, 19, 21, 22, 24, 25, 27,
  103.       17, 19, 21, 22, 24, 25, 27, 28,
  104.       19, 21, 22, 24, 25, 27, 28, 30,
  105.       21, 22, 24, 25, 27, 28, 30, 32,
  106.       22, 24, 25, 27, 28, 30, 32, 33,
  107.       24, 25, 27, 28, 30, 32, 33, 35 }
  108. };
  109.  
  110. static inline int decode_hrd_parameters(H264Context *h, SPS *sps)
  111. {
  112.     int cpb_count, i;
  113.     cpb_count = get_ue_golomb_31(&h->gb) + 1;
  114.  
  115.     if (cpb_count > 32U) {
  116.         av_log(h->avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
  117.         return AVERROR_INVALIDDATA;
  118.     }
  119.  
  120.     get_bits(&h->gb, 4); /* bit_rate_scale */
  121.     get_bits(&h->gb, 4); /* cpb_size_scale */
  122.     for (i = 0; i < cpb_count; i++) {
  123.         get_ue_golomb_long(&h->gb); /* bit_rate_value_minus1 */
  124.         get_ue_golomb_long(&h->gb); /* cpb_size_value_minus1 */
  125.         get_bits1(&h->gb);          /* cbr_flag */
  126.     }
  127.     sps->initial_cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
  128.     sps->cpb_removal_delay_length         = get_bits(&h->gb, 5) + 1;
  129.     sps->dpb_output_delay_length          = get_bits(&h->gb, 5) + 1;
  130.     sps->time_offset_length               = get_bits(&h->gb, 5);
  131.     sps->cpb_cnt                          = cpb_count;
  132.     return 0;
  133. }
  134.  
  135. static inline int decode_vui_parameters(H264Context *h, SPS *sps)
  136. {
  137.     int aspect_ratio_info_present_flag;
  138.     unsigned int aspect_ratio_idc;
  139.  
  140.     aspect_ratio_info_present_flag = get_bits1(&h->gb);
  141.  
  142.     if (aspect_ratio_info_present_flag) {
  143.         aspect_ratio_idc = get_bits(&h->gb, 8);
  144.         if (aspect_ratio_idc == EXTENDED_SAR) {
  145.             sps->sar.num = get_bits(&h->gb, 16);
  146.             sps->sar.den = get_bits(&h->gb, 16);
  147.         } else if (aspect_ratio_idc < FF_ARRAY_ELEMS(ff_h264_pixel_aspect)) {
  148.             sps->sar = ff_h264_pixel_aspect[aspect_ratio_idc];
  149.         } else {
  150.             av_log(h->avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
  151.             return AVERROR_INVALIDDATA;
  152.         }
  153.     } else {
  154.         sps->sar.num =
  155.         sps->sar.den = 0;
  156.     }
  157.  
  158.     if (get_bits1(&h->gb))      /* overscan_info_present_flag */
  159.         get_bits1(&h->gb);      /* overscan_appropriate_flag */
  160.  
  161.     sps->video_signal_type_present_flag = get_bits1(&h->gb);
  162.     if (sps->video_signal_type_present_flag) {
  163.         get_bits(&h->gb, 3);                 /* video_format */
  164.         sps->full_range = get_bits1(&h->gb); /* video_full_range_flag */
  165.  
  166.         sps->colour_description_present_flag = get_bits1(&h->gb);
  167.         if (sps->colour_description_present_flag) {
  168.             sps->color_primaries = get_bits(&h->gb, 8); /* colour_primaries */
  169.             sps->color_trc       = get_bits(&h->gb, 8); /* transfer_characteristics */
  170.             sps->colorspace      = get_bits(&h->gb, 8); /* matrix_coefficients */
  171.             if (sps->color_primaries >= AVCOL_PRI_NB)
  172.                 sps->color_primaries = AVCOL_PRI_UNSPECIFIED;
  173.             if (sps->color_trc >= AVCOL_TRC_NB)
  174.                 sps->color_trc = AVCOL_TRC_UNSPECIFIED;
  175.             if (sps->colorspace >= AVCOL_SPC_NB)
  176.                 sps->colorspace = AVCOL_SPC_UNSPECIFIED;
  177.         }
  178.     }
  179.  
  180.     /* chroma_location_info_present_flag */
  181.     if (get_bits1(&h->gb)) {
  182.         /* chroma_sample_location_type_top_field */
  183.         h->avctx->chroma_sample_location = get_ue_golomb(&h->gb) + 1;
  184.         get_ue_golomb(&h->gb);  /* chroma_sample_location_type_bottom_field */
  185.     }
  186.  
  187.     if (show_bits1(&h->gb) && get_bits_left(&h->gb) < 10) {
  188.         av_log(h->avctx, AV_LOG_WARNING, "Truncated VUI\n");
  189.         return 0;
  190.     }
  191.  
  192.     sps->timing_info_present_flag = get_bits1(&h->gb);
  193.     if (sps->timing_info_present_flag) {
  194.         unsigned num_units_in_tick = get_bits_long(&h->gb, 32);
  195.         unsigned time_scale        = get_bits_long(&h->gb, 32);
  196.         if (!num_units_in_tick || !time_scale) {
  197.             av_log(h->avctx, AV_LOG_ERROR,
  198.                    "time_scale/num_units_in_tick invalid or unsupported (%u/%u)\n",
  199.                    time_scale, num_units_in_tick);
  200.             sps->timing_info_present_flag = 0;
  201.         } else {
  202.             sps->num_units_in_tick = num_units_in_tick;
  203.             sps->time_scale = time_scale;
  204.         }
  205.         sps->fixed_frame_rate_flag = get_bits1(&h->gb);
  206.     }
  207.  
  208.     sps->nal_hrd_parameters_present_flag = get_bits1(&h->gb);
  209.     if (sps->nal_hrd_parameters_present_flag)
  210.         if (decode_hrd_parameters(h, sps) < 0)
  211.             return AVERROR_INVALIDDATA;
  212.     sps->vcl_hrd_parameters_present_flag = get_bits1(&h->gb);
  213.     if (sps->vcl_hrd_parameters_present_flag)
  214.         if (decode_hrd_parameters(h, sps) < 0)
  215.             return AVERROR_INVALIDDATA;
  216.     if (sps->nal_hrd_parameters_present_flag ||
  217.         sps->vcl_hrd_parameters_present_flag)
  218.         get_bits1(&h->gb);     /* low_delay_hrd_flag */
  219.     sps->pic_struct_present_flag = get_bits1(&h->gb);
  220.     if (!get_bits_left(&h->gb))
  221.         return 0;
  222.     sps->bitstream_restriction_flag = get_bits1(&h->gb);
  223.     if (sps->bitstream_restriction_flag) {
  224.         get_bits1(&h->gb);     /* motion_vectors_over_pic_boundaries_flag */
  225.         get_ue_golomb(&h->gb); /* max_bytes_per_pic_denom */
  226.         get_ue_golomb(&h->gb); /* max_bits_per_mb_denom */
  227.         get_ue_golomb(&h->gb); /* log2_max_mv_length_horizontal */
  228.         get_ue_golomb(&h->gb); /* log2_max_mv_length_vertical */
  229.         sps->num_reorder_frames = get_ue_golomb(&h->gb);
  230.         get_ue_golomb(&h->gb); /*max_dec_frame_buffering*/
  231.  
  232.         if (get_bits_left(&h->gb) < 0) {
  233.             sps->num_reorder_frames         = 0;
  234.             sps->bitstream_restriction_flag = 0;
  235.         }
  236.  
  237.         if (sps->num_reorder_frames > 16U
  238.             /* max_dec_frame_buffering || max_dec_frame_buffering > 16 */) {
  239.             av_log(h->avctx, AV_LOG_ERROR,
  240.                    "Clipping illegal num_reorder_frames %d\n",
  241.                    sps->num_reorder_frames);
  242.             sps->num_reorder_frames = 16;
  243.             return AVERROR_INVALIDDATA;
  244.         }
  245.     }
  246.  
  247.     return 0;
  248. }
  249.  
  250. static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
  251.                                 const uint8_t *jvt_list,
  252.                                 const uint8_t *fallback_list)
  253. {
  254.     int i, last = 8, next = 8;
  255.     const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
  256.     if (!get_bits1(&h->gb)) /* matrix not written, we use the predicted one */
  257.         memcpy(factors, fallback_list, size * sizeof(uint8_t));
  258.     else
  259.         for (i = 0; i < size; i++) {
  260.             if (next)
  261.                 next = (last + get_se_golomb(&h->gb)) & 0xff;
  262.             if (!i && !next) { /* matrix not written, we use the preset one */
  263.                 memcpy(factors, jvt_list, size * sizeof(uint8_t));
  264.                 break;
  265.             }
  266.             last = factors[scan[i]] = next ? next : last;
  267.         }
  268. }
  269.  
  270. static void decode_scaling_matrices(H264Context *h, SPS *sps,
  271.                                     PPS *pps, int is_sps,
  272.                                     uint8_t(*scaling_matrix4)[16],
  273.                                     uint8_t(*scaling_matrix8)[64])
  274. {
  275.     int fallback_sps = !is_sps && sps->scaling_matrix_present;
  276.     const uint8_t *fallback[4] = {
  277.         fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
  278.         fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
  279.         fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
  280.         fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
  281.     };
  282.     if (get_bits1(&h->gb)) {
  283.         sps->scaling_matrix_present |= is_sps;
  284.         decode_scaling_list(h, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]);        // Intra, Y
  285.         decode_scaling_list(h, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
  286.         decode_scaling_list(h, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
  287.         decode_scaling_list(h, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]);        // Inter, Y
  288.         decode_scaling_list(h, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
  289.         decode_scaling_list(h, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
  290.         if (is_sps || pps->transform_8x8_mode) {
  291.             decode_scaling_list(h, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
  292.             decode_scaling_list(h, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
  293.             if (sps->chroma_format_idc == 3) {
  294.                 decode_scaling_list(h, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
  295.                 decode_scaling_list(h, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
  296.                 decode_scaling_list(h, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
  297.                 decode_scaling_list(h, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
  298.             }
  299.         }
  300.     }
  301. }
  302.  
  303. int ff_h264_decode_seq_parameter_set(H264Context *h, int ignore_truncation)
  304. {
  305.     int profile_idc, level_idc, constraint_set_flags = 0;
  306.     unsigned int sps_id;
  307.     int i, log2_max_frame_num_minus4;
  308.     SPS *sps;
  309.  
  310.     profile_idc           = get_bits(&h->gb, 8);
  311.     constraint_set_flags |= get_bits1(&h->gb) << 0;   // constraint_set0_flag
  312.     constraint_set_flags |= get_bits1(&h->gb) << 1;   // constraint_set1_flag
  313.     constraint_set_flags |= get_bits1(&h->gb) << 2;   // constraint_set2_flag
  314.     constraint_set_flags |= get_bits1(&h->gb) << 3;   // constraint_set3_flag
  315.     constraint_set_flags |= get_bits1(&h->gb) << 4;   // constraint_set4_flag
  316.     constraint_set_flags |= get_bits1(&h->gb) << 5;   // constraint_set5_flag
  317.     skip_bits(&h->gb, 2);                             // reserved_zero_2bits
  318.     level_idc = get_bits(&h->gb, 8);
  319.     sps_id    = get_ue_golomb_31(&h->gb);
  320.  
  321.     if (sps_id >= MAX_SPS_COUNT) {
  322.         av_log(h->avctx, AV_LOG_ERROR, "sps_id %u out of range\n", sps_id);
  323.         return AVERROR_INVALIDDATA;
  324.     }
  325.     sps = av_mallocz(sizeof(SPS));
  326.     if (!sps)
  327.         return AVERROR(ENOMEM);
  328.  
  329.     sps->sps_id               = sps_id;
  330.     sps->time_offset_length   = 24;
  331.     sps->profile_idc          = profile_idc;
  332.     sps->constraint_set_flags = constraint_set_flags;
  333.     sps->level_idc            = level_idc;
  334.     sps->full_range           = -1;
  335.  
  336.     memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
  337.     memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
  338.     sps->scaling_matrix_present = 0;
  339.     sps->colorspace = 2; //AVCOL_SPC_UNSPECIFIED
  340.  
  341.     if (sps->profile_idc == 100 ||  // High profile
  342.         sps->profile_idc == 110 ||  // High10 profile
  343.         sps->profile_idc == 122 ||  // High422 profile
  344.         sps->profile_idc == 244 ||  // High444 Predictive profile
  345.         sps->profile_idc ==  44 ||  // Cavlc444 profile
  346.         sps->profile_idc ==  83 ||  // Scalable Constrained High profile (SVC)
  347.         sps->profile_idc ==  86 ||  // Scalable High Intra profile (SVC)
  348.         sps->profile_idc == 118 ||  // Stereo High profile (MVC)
  349.         sps->profile_idc == 128 ||  // Multiview High profile (MVC)
  350.         sps->profile_idc == 138 ||  // Multiview Depth High profile (MVCD)
  351.         sps->profile_idc == 144) {  // old High444 profile
  352.         sps->chroma_format_idc = get_ue_golomb_31(&h->gb);
  353.         if (sps->chroma_format_idc > 3U) {
  354.             avpriv_request_sample(h->avctx, "chroma_format_idc %u",
  355.                                   sps->chroma_format_idc);
  356.             goto fail;
  357.         } else if (sps->chroma_format_idc == 3) {
  358.             sps->residual_color_transform_flag = get_bits1(&h->gb);
  359.             if (sps->residual_color_transform_flag) {
  360.                 av_log(h->avctx, AV_LOG_ERROR, "separate color planes are not supported\n");
  361.                 goto fail;
  362.             }
  363.         }
  364.         sps->bit_depth_luma   = get_ue_golomb(&h->gb) + 8;
  365.         sps->bit_depth_chroma = get_ue_golomb(&h->gb) + 8;
  366.         if (sps->bit_depth_chroma != sps->bit_depth_luma) {
  367.             avpriv_request_sample(h->avctx,
  368.                                   "Different chroma and luma bit depth");
  369.             goto fail;
  370.         }
  371.         if (sps->bit_depth_luma   < 8 || sps->bit_depth_luma   > 14 ||
  372.             sps->bit_depth_chroma < 8 || sps->bit_depth_chroma > 14) {
  373.             av_log(h->avctx, AV_LOG_ERROR, "illegal bit depth value (%d, %d)\n",
  374.                    sps->bit_depth_luma, sps->bit_depth_chroma);
  375.             goto fail;
  376.         }
  377.         sps->transform_bypass = get_bits1(&h->gb);
  378.         decode_scaling_matrices(h, sps, NULL, 1,
  379.                                 sps->scaling_matrix4, sps->scaling_matrix8);
  380.     } else {
  381.         sps->chroma_format_idc = 1;
  382.         sps->bit_depth_luma    = 8;
  383.         sps->bit_depth_chroma  = 8;
  384.     }
  385.  
  386.     log2_max_frame_num_minus4 = get_ue_golomb(&h->gb);
  387.     if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||
  388.         log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {
  389.         av_log(h->avctx, AV_LOG_ERROR,
  390.                "log2_max_frame_num_minus4 out of range (0-12): %d\n",
  391.                log2_max_frame_num_minus4);
  392.         goto fail;
  393.     }
  394.     sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;
  395.  
  396.     sps->poc_type = get_ue_golomb_31(&h->gb);
  397.  
  398.     if (sps->poc_type == 0) { // FIXME #define
  399.         unsigned t = get_ue_golomb(&h->gb);
  400.         if (t>12) {
  401.             av_log(h->avctx, AV_LOG_ERROR, "log2_max_poc_lsb (%d) is out of range\n", t);
  402.             goto fail;
  403.         }
  404.         sps->log2_max_poc_lsb = t + 4;
  405.     } else if (sps->poc_type == 1) { // FIXME #define
  406.         sps->delta_pic_order_always_zero_flag = get_bits1(&h->gb);
  407.         sps->offset_for_non_ref_pic           = get_se_golomb(&h->gb);
  408.         sps->offset_for_top_to_bottom_field   = get_se_golomb(&h->gb);
  409.         sps->poc_cycle_length                 = get_ue_golomb(&h->gb);
  410.  
  411.         if ((unsigned)sps->poc_cycle_length >=
  412.             FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {
  413.             av_log(h->avctx, AV_LOG_ERROR,
  414.                    "poc_cycle_length overflow %d\n", sps->poc_cycle_length);
  415.             goto fail;
  416.         }
  417.  
  418.         for (i = 0; i < sps->poc_cycle_length; i++)
  419.             sps->offset_for_ref_frame[i] = get_se_golomb(&h->gb);
  420.     } else if (sps->poc_type != 2) {
  421.         av_log(h->avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
  422.         goto fail;
  423.     }
  424.  
  425.     sps->ref_frame_count = get_ue_golomb_31(&h->gb);
  426.     if (h->avctx->codec_tag == MKTAG('S', 'M', 'V', '2'))
  427.         sps->ref_frame_count = FFMAX(2, sps->ref_frame_count);
  428.     if (sps->ref_frame_count > H264_MAX_PICTURE_COUNT - 2 ||
  429.         sps->ref_frame_count > 16U) {
  430.         av_log(h->avctx, AV_LOG_ERROR,
  431.                "too many reference frames %d\n", sps->ref_frame_count);
  432.         goto fail;
  433.     }
  434.     sps->gaps_in_frame_num_allowed_flag = get_bits1(&h->gb);
  435.     sps->mb_width                       = get_ue_golomb(&h->gb) + 1;
  436.     sps->mb_height                      = get_ue_golomb(&h->gb) + 1;
  437.     if ((unsigned)sps->mb_width  >= INT_MAX / 16 ||
  438.         (unsigned)sps->mb_height >= INT_MAX / 16 ||
  439.         av_image_check_size(16 * sps->mb_width,
  440.                             16 * sps->mb_height, 0, h->avctx)) {
  441.         av_log(h->avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
  442.         goto fail;
  443.     }
  444.  
  445.     sps->frame_mbs_only_flag = get_bits1(&h->gb);
  446.     if (!sps->frame_mbs_only_flag)
  447.         sps->mb_aff = get_bits1(&h->gb);
  448.     else
  449.         sps->mb_aff = 0;
  450.  
  451.     sps->direct_8x8_inference_flag = get_bits1(&h->gb);
  452.  
  453. #ifndef ALLOW_INTERLACE
  454.     if (sps->mb_aff)
  455.         av_log(h->avctx, AV_LOG_ERROR,
  456.                "MBAFF support not included; enable it at compile-time.\n");
  457. #endif
  458.     sps->crop = get_bits1(&h->gb);
  459.     if (sps->crop) {
  460.         unsigned int crop_left   = get_ue_golomb(&h->gb);
  461.         unsigned int crop_right  = get_ue_golomb(&h->gb);
  462.         unsigned int crop_top    = get_ue_golomb(&h->gb);
  463.         unsigned int crop_bottom = get_ue_golomb(&h->gb);
  464.         int width  = 16 * sps->mb_width;
  465.         int height = 16 * sps->mb_height * (2 - sps->frame_mbs_only_flag);
  466.  
  467.         if (h->avctx->flags2 & AV_CODEC_FLAG2_IGNORE_CROP) {
  468.             av_log(h->avctx, AV_LOG_DEBUG, "discarding sps cropping, original "
  469.                                            "values are l:%d r:%d t:%d b:%d\n",
  470.                    crop_left, crop_right, crop_top, crop_bottom);
  471.  
  472.             sps->crop_left   =
  473.             sps->crop_right  =
  474.             sps->crop_top    =
  475.             sps->crop_bottom = 0;
  476.         } else {
  477.             int vsub   = (sps->chroma_format_idc == 1) ? 1 : 0;
  478.             int hsub   = (sps->chroma_format_idc == 1 ||
  479.                           sps->chroma_format_idc == 2) ? 1 : 0;
  480.             int step_x = 1 << hsub;
  481.             int step_y = (2 - sps->frame_mbs_only_flag) << vsub;
  482.  
  483.             if (crop_left & (0x1F >> (sps->bit_depth_luma > 8)) &&
  484.                 !(h->avctx->flags & AV_CODEC_FLAG_UNALIGNED)) {
  485.                 crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));
  486.                 av_log(h->avctx, AV_LOG_WARNING,
  487.                        "Reducing left cropping to %d "
  488.                        "chroma samples to preserve alignment.\n",
  489.                        crop_left);
  490.             }
  491.  
  492.             if (crop_left  > (unsigned)INT_MAX / 4 / step_x ||
  493.                 crop_right > (unsigned)INT_MAX / 4 / step_x ||
  494.                 crop_top   > (unsigned)INT_MAX / 4 / step_y ||
  495.                 crop_bottom> (unsigned)INT_MAX / 4 / step_y ||
  496.                 (crop_left + crop_right ) * step_x >= width ||
  497.                 (crop_top  + crop_bottom) * step_y >= height
  498.             ) {
  499.                 av_log(h->avctx, AV_LOG_ERROR, "crop values invalid %d %d %d %d / %d %d\n", crop_left, crop_right, crop_top, crop_bottom, width, height);
  500.                 goto fail;
  501.             }
  502.  
  503.             sps->crop_left   = crop_left   * step_x;
  504.             sps->crop_right  = crop_right  * step_x;
  505.             sps->crop_top    = crop_top    * step_y;
  506.             sps->crop_bottom = crop_bottom * step_y;
  507.         }
  508.     } else {
  509.         sps->crop_left   =
  510.         sps->crop_right  =
  511.         sps->crop_top    =
  512.         sps->crop_bottom =
  513.         sps->crop        = 0;
  514.     }
  515.  
  516.     sps->vui_parameters_present_flag = get_bits1(&h->gb);
  517.     if (sps->vui_parameters_present_flag) {
  518.         int ret = decode_vui_parameters(h, sps);
  519.         if (ret < 0)
  520.             goto fail;
  521.     }
  522.  
  523.     if (get_bits_left(&h->gb) < 0) {
  524.         av_log(h->avctx, ignore_truncation ? AV_LOG_WARNING : AV_LOG_ERROR,
  525.                "Overread %s by %d bits\n", sps->vui_parameters_present_flag ? "VUI" : "SPS", -get_bits_left(&h->gb));
  526.         if (!ignore_truncation)
  527.             goto fail;
  528.     }
  529.  
  530.     if (!sps->sar.den)
  531.         sps->sar.den = 1;
  532.  
  533.     if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
  534.         static const char csp[4][5] = { "Gray", "420", "422", "444" };
  535.         av_log(h->avctx, AV_LOG_DEBUG,
  536.                "sps:%u profile:%d/%d poc:%d ref:%d %dx%d %s %s crop:%u/%u/%u/%u %s %s %"PRId32"/%"PRId32" b%d reo:%d\n",
  537.                sps_id, sps->profile_idc, sps->level_idc,
  538.                sps->poc_type,
  539.                sps->ref_frame_count,
  540.                sps->mb_width, sps->mb_height,
  541.                sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
  542.                sps->direct_8x8_inference_flag ? "8B8" : "",
  543.                sps->crop_left, sps->crop_right,
  544.                sps->crop_top, sps->crop_bottom,
  545.                sps->vui_parameters_present_flag ? "VUI" : "",
  546.                csp[sps->chroma_format_idc],
  547.                sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
  548.                sps->timing_info_present_flag ? sps->time_scale : 0,
  549.                sps->bit_depth_luma,
  550.                sps->bitstream_restriction_flag ? sps->num_reorder_frames : -1
  551.                );
  552.     }
  553.     sps->new = 1;
  554.  
  555.     av_free(h->sps_buffers[sps_id]);
  556.     h->sps_buffers[sps_id] = sps;
  557.  
  558.     return 0;
  559.  
  560. fail:
  561.     av_free(sps);
  562.     return AVERROR_INVALIDDATA;
  563. }
  564.  
  565. static void build_qp_table(PPS *pps, int t, int index, const int depth)
  566. {
  567.     int i;
  568.     const int max_qp = 51 + 6 * (depth - 8);
  569.     for (i = 0; i < max_qp + 1; i++)
  570.         pps->chroma_qp_table[t][i] =
  571.             ff_h264_chroma_qp[depth - 8][av_clip(i + index, 0, max_qp)];
  572. }
  573.  
  574. static int more_rbsp_data_in_pps(H264Context *h, PPS *pps)
  575. {
  576.     const SPS *sps = h->sps_buffers[pps->sps_id];
  577.     int profile_idc = sps->profile_idc;
  578.  
  579.     if ((profile_idc == 66 || profile_idc == 77 ||
  580.          profile_idc == 88) && (sps->constraint_set_flags & 7)) {
  581.         av_log(h->avctx, AV_LOG_VERBOSE,
  582.                "Current profile doesn't provide more RBSP data in PPS, skipping\n");
  583.         return 0;
  584.     }
  585.  
  586.     return 1;
  587. }
  588.  
  589. int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
  590. {
  591.     const SPS *sps;
  592.     unsigned int pps_id = get_ue_golomb(&h->gb);
  593.     PPS *pps;
  594.     int qp_bd_offset;
  595.     int bits_left;
  596.     int ret;
  597.  
  598.     if (pps_id >= MAX_PPS_COUNT) {
  599.         av_log(h->avctx, AV_LOG_ERROR, "pps_id %u out of range\n", pps_id);
  600.         return AVERROR_INVALIDDATA;
  601.     }
  602.  
  603.     pps = av_mallocz(sizeof(PPS));
  604.     if (!pps)
  605.         return AVERROR(ENOMEM);
  606.     pps->sps_id = get_ue_golomb_31(&h->gb);
  607.     if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
  608.         !h->sps_buffers[pps->sps_id]) {
  609.         av_log(h->avctx, AV_LOG_ERROR, "sps_id %u out of range\n", pps->sps_id);
  610.         ret = AVERROR_INVALIDDATA;
  611.         goto fail;
  612.     }
  613.     sps = h->sps_buffers[pps->sps_id];
  614.     if (sps->bit_depth_luma > 14) {
  615.         av_log(h->avctx, AV_LOG_ERROR,
  616.                "Invalid luma bit depth=%d\n",
  617.                sps->bit_depth_luma);
  618.         ret = AVERROR_INVALIDDATA;
  619.         goto fail;
  620.     } else if (sps->bit_depth_luma == 11 || sps->bit_depth_luma == 13) {
  621.         av_log(h->avctx, AV_LOG_ERROR,
  622.                "Unimplemented luma bit depth=%d\n",
  623.                sps->bit_depth_luma);
  624.         ret = AVERROR_PATCHWELCOME;
  625.         goto fail;
  626.     }
  627.  
  628.     pps->cabac             = get_bits1(&h->gb);
  629.     pps->pic_order_present = get_bits1(&h->gb);
  630.     pps->slice_group_count = get_ue_golomb(&h->gb) + 1;
  631.     if (pps->slice_group_count > 1) {
  632.         pps->mb_slice_group_map_type = get_ue_golomb(&h->gb);
  633.         av_log(h->avctx, AV_LOG_ERROR, "FMO not supported\n");
  634.         switch (pps->mb_slice_group_map_type) {
  635.         case 0:
  636. #if 0
  637.     |       for (i = 0; i <= num_slice_groups_minus1; i++)  |   |      |
  638.     |           run_length[i]                               |1  |ue(v) |
  639. #endif
  640.             break;
  641.         case 2:
  642. #if 0
  643.     |       for (i = 0; i < num_slice_groups_minus1; i++) { |   |      |
  644.     |           top_left_mb[i]                              |1  |ue(v) |
  645.     |           bottom_right_mb[i]                          |1  |ue(v) |
  646.     |       }                                               |   |      |
  647. #endif
  648.             break;
  649.         case 3:
  650.         case 4:
  651.         case 5:
  652. #if 0
  653.     |       slice_group_change_direction_flag               |1  |u(1)  |
  654.     |       slice_group_change_rate_minus1                  |1  |ue(v) |
  655. #endif
  656.             break;
  657.         case 6:
  658. #if 0
  659.     |       slice_group_id_cnt_minus1                       |1  |ue(v) |
  660.     |       for (i = 0; i <= slice_group_id_cnt_minus1; i++)|   |      |
  661.     |           slice_group_id[i]                           |1  |u(v)  |
  662. #endif
  663.             break;
  664.         }
  665.     }
  666.     pps->ref_count[0] = get_ue_golomb(&h->gb) + 1;
  667.     pps->ref_count[1] = get_ue_golomb(&h->gb) + 1;
  668.     if (pps->ref_count[0] - 1 > 32 - 1 || pps->ref_count[1] - 1 > 32 - 1) {
  669.         av_log(h->avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
  670.         ret = AVERROR_INVALIDDATA;
  671.         goto fail;
  672.     }
  673.  
  674.     qp_bd_offset = 6 * (sps->bit_depth_luma - 8);
  675.  
  676.     pps->weighted_pred                        = get_bits1(&h->gb);
  677.     pps->weighted_bipred_idc                  = get_bits(&h->gb, 2);
  678.     pps->init_qp                              = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
  679.     pps->init_qs                              = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
  680.     pps->chroma_qp_index_offset[0]            = get_se_golomb(&h->gb);
  681.     pps->deblocking_filter_parameters_present = get_bits1(&h->gb);
  682.     pps->constrained_intra_pred               = get_bits1(&h->gb);
  683.     pps->redundant_pic_cnt_present            = get_bits1(&h->gb);
  684.  
  685.     pps->transform_8x8_mode = 0;
  686.     // contents of sps/pps can change even if id doesn't, so reinit
  687.     h->dequant_coeff_pps = -1;
  688.     memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4,
  689.            sizeof(pps->scaling_matrix4));
  690.     memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8,
  691.            sizeof(pps->scaling_matrix8));
  692.  
  693.     bits_left = bit_length - get_bits_count(&h->gb);
  694.     if (bits_left > 0 && more_rbsp_data_in_pps(h, pps)) {
  695.         pps->transform_8x8_mode = get_bits1(&h->gb);
  696.         decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0,
  697.                                 pps->scaling_matrix4, pps->scaling_matrix8);
  698.         // second_chroma_qp_index_offset
  699.         pps->chroma_qp_index_offset[1] = get_se_golomb(&h->gb);
  700.     } else {
  701.         pps->chroma_qp_index_offset[1] = pps->chroma_qp_index_offset[0];
  702.     }
  703.  
  704.     build_qp_table(pps, 0, pps->chroma_qp_index_offset[0],
  705.                    sps->bit_depth_luma);
  706.     build_qp_table(pps, 1, pps->chroma_qp_index_offset[1],
  707.                    sps->bit_depth_luma);
  708.     if (pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
  709.         pps->chroma_qp_diff = 1;
  710.  
  711.     if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
  712.         av_log(h->avctx, AV_LOG_DEBUG,
  713.                "pps:%u sps:%u %s slice_groups:%d ref:%u/%u %s qp:%d/%d/%d/%d %s %s %s %s\n",
  714.                pps_id, pps->sps_id,
  715.                pps->cabac ? "CABAC" : "CAVLC",
  716.                pps->slice_group_count,
  717.                pps->ref_count[0], pps->ref_count[1],
  718.                pps->weighted_pred ? "weighted" : "",
  719.                pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
  720.                pps->deblocking_filter_parameters_present ? "LPAR" : "",
  721.                pps->constrained_intra_pred ? "CONSTR" : "",
  722.                pps->redundant_pic_cnt_present ? "REDU" : "",
  723.                pps->transform_8x8_mode ? "8x8DCT" : "");
  724.     }
  725.  
  726.     av_free(h->pps_buffers[pps_id]);
  727.     h->pps_buffers[pps_id] = pps;
  728.     return 0;
  729.  
  730. fail:
  731.     av_free(pps);
  732.     return ret;
  733. }
  734.