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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 "libavutil/imgutils.h"
  29. #include "internal.h"
  30. #include "avcodec.h"
  31. #include "h264.h"
  32. #include "h264data.h" //FIXME FIXME FIXME (just for zigzag_scan)
  33. #include "golomb.h"
  34.  
  35. #define MAX_LOG2_MAX_FRAME_NUM    (12 + 4)
  36. #define MIN_LOG2_MAX_FRAME_NUM    4
  37.  
  38. static const AVRational pixel_aspect[17] = {
  39.     {   0,  1 },
  40.     {   1,  1 },
  41.     {  12, 11 },
  42.     {  10, 11 },
  43.     {  16, 11 },
  44.     {  40, 33 },
  45.     {  24, 11 },
  46.     {  20, 11 },
  47.     {  32, 11 },
  48.     {  80, 33 },
  49.     {  18, 11 },
  50.     {  15, 11 },
  51.     {  64, 33 },
  52.     { 160, 99 },
  53.     {   4,  3 },
  54.     {   3,  2 },
  55.     {   2,  1 },
  56. };
  57.  
  58. #define QP(qP, depth) ((qP) + 6 * ((depth) - 8))
  59.  
  60. #define CHROMA_QP_TABLE_END(d)                                          \
  61.     QP(0,  d), QP(1,  d), QP(2,  d), QP(3,  d), QP(4,  d), QP(5,  d),   \
  62.     QP(6,  d), QP(7,  d), QP(8,  d), QP(9,  d), QP(10, d), QP(11, d),   \
  63.     QP(12, d), QP(13, d), QP(14, d), QP(15, d), QP(16, d), QP(17, d),   \
  64.     QP(18, d), QP(19, d), QP(20, d), QP(21, d), QP(22, d), QP(23, d),   \
  65.     QP(24, d), QP(25, d), QP(26, d), QP(27, d), QP(28, d), QP(29, d),   \
  66.     QP(29, d), QP(30, d), QP(31, d), QP(32, d), QP(32, d), QP(33, d),   \
  67.     QP(34, d), QP(34, d), QP(35, d), QP(35, d), QP(36, d), QP(36, d),   \
  68.     QP(37, d), QP(37, d), QP(37, d), QP(38, d), QP(38, d), QP(38, d),   \
  69.     QP(39, d), QP(39, d), QP(39, d), QP(39, d)
  70.  
  71. const uint8_t ff_h264_chroma_qp[7][QP_MAX_NUM + 1] = {
  72.     { CHROMA_QP_TABLE_END(8) },
  73.     { 0, 1, 2, 3, 4, 5,
  74.       CHROMA_QP_TABLE_END(9) },
  75.     { 0, 1, 2, 3,  4,  5,
  76.       6, 7, 8, 9, 10, 11,
  77.       CHROMA_QP_TABLE_END(10) },
  78.     { 0,  1, 2, 3,  4,  5,
  79.       6,  7, 8, 9, 10, 11,
  80.       12,13,14,15, 16, 17,
  81.       CHROMA_QP_TABLE_END(11) },
  82.     { 0,  1, 2, 3,  4,  5,
  83.       6,  7, 8, 9, 10, 11,
  84.       12,13,14,15, 16, 17,
  85.       18,19,20,21, 22, 23,
  86.       CHROMA_QP_TABLE_END(12) },
  87.     { 0,  1, 2, 3,  4,  5,
  88.       6,  7, 8, 9, 10, 11,
  89.       12,13,14,15, 16, 17,
  90.       18,19,20,21, 22, 23,
  91.       24,25,26,27, 28, 29,
  92.       CHROMA_QP_TABLE_END(13) },
  93.     { 0,  1, 2, 3,  4,  5,
  94.       6,  7, 8, 9, 10, 11,
  95.       12,13,14,15, 16, 17,
  96.       18,19,20,21, 22, 23,
  97.       24,25,26,27, 28, 29,
  98.       30,31,32,33, 34, 35,
  99.       CHROMA_QP_TABLE_END(14) },
  100. };
  101.  
  102. static const uint8_t default_scaling4[2][16] = {
  103.     {  6, 13, 20, 28, 13, 20, 28, 32,
  104.       20, 28, 32, 37, 28, 32, 37, 42 },
  105.     { 10, 14, 20, 24, 14, 20, 24, 27,
  106.       20, 24, 27, 30, 24, 27, 30, 34 }
  107. };
  108.  
  109. static const uint8_t default_scaling8[2][64] = {
  110.     {  6, 10, 13, 16, 18, 23, 25, 27,
  111.       10, 11, 16, 18, 23, 25, 27, 29,
  112.       13, 16, 18, 23, 25, 27, 29, 31,
  113.       16, 18, 23, 25, 27, 29, 31, 33,
  114.       18, 23, 25, 27, 29, 31, 33, 36,
  115.       23, 25, 27, 29, 31, 33, 36, 38,
  116.       25, 27, 29, 31, 33, 36, 38, 40,
  117.       27, 29, 31, 33, 36, 38, 40, 42 },
  118.     {  9, 13, 15, 17, 19, 21, 22, 24,
  119.       13, 13, 17, 19, 21, 22, 24, 25,
  120.       15, 17, 19, 21, 22, 24, 25, 27,
  121.       17, 19, 21, 22, 24, 25, 27, 28,
  122.       19, 21, 22, 24, 25, 27, 28, 30,
  123.       21, 22, 24, 25, 27, 28, 30, 32,
  124.       22, 24, 25, 27, 28, 30, 32, 33,
  125.       24, 25, 27, 28, 30, 32, 33, 35 }
  126. };
  127.  
  128. static inline int decode_hrd_parameters(H264Context *h, SPS *sps)
  129. {
  130.     int cpb_count, i;
  131.     cpb_count = get_ue_golomb_31(&h->gb) + 1;
  132.  
  133.     if (cpb_count > 32U) {
  134.         av_log(h->avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
  135.         return AVERROR_INVALIDDATA;
  136.     }
  137.  
  138.     get_bits(&h->gb, 4); /* bit_rate_scale */
  139.     get_bits(&h->gb, 4); /* cpb_size_scale */
  140.     for (i = 0; i < cpb_count; i++) {
  141.         get_ue_golomb_long(&h->gb); /* bit_rate_value_minus1 */
  142.         get_ue_golomb_long(&h->gb); /* cpb_size_value_minus1 */
  143.         get_bits1(&h->gb);          /* cbr_flag */
  144.     }
  145.     sps->initial_cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
  146.     sps->cpb_removal_delay_length         = get_bits(&h->gb, 5) + 1;
  147.     sps->dpb_output_delay_length          = get_bits(&h->gb, 5) + 1;
  148.     sps->time_offset_length               = get_bits(&h->gb, 5);
  149.     sps->cpb_cnt                          = cpb_count;
  150.     return 0;
  151. }
  152.  
  153. static inline int decode_vui_parameters(H264Context *h, SPS *sps)
  154. {
  155.     int aspect_ratio_info_present_flag;
  156.     unsigned int aspect_ratio_idc;
  157.  
  158.     aspect_ratio_info_present_flag = get_bits1(&h->gb);
  159.  
  160.     if (aspect_ratio_info_present_flag) {
  161.         aspect_ratio_idc = get_bits(&h->gb, 8);
  162.         if (aspect_ratio_idc == EXTENDED_SAR) {
  163.             sps->sar.num = get_bits(&h->gb, 16);
  164.             sps->sar.den = get_bits(&h->gb, 16);
  165.         } else if (aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)) {
  166.             sps->sar = pixel_aspect[aspect_ratio_idc];
  167.         } else {
  168.             av_log(h->avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
  169.             return AVERROR_INVALIDDATA;
  170.         }
  171.     } else {
  172.         sps->sar.num =
  173.         sps->sar.den = 0;
  174.     }
  175.  
  176.     if (get_bits1(&h->gb))      /* overscan_info_present_flag */
  177.         get_bits1(&h->gb);      /* overscan_appropriate_flag */
  178.  
  179.     sps->video_signal_type_present_flag = get_bits1(&h->gb);
  180.     if (sps->video_signal_type_present_flag) {
  181.         get_bits(&h->gb, 3);                 /* video_format */
  182.         sps->full_range = get_bits1(&h->gb); /* video_full_range_flag */
  183.  
  184.         sps->colour_description_present_flag = get_bits1(&h->gb);
  185.         if (sps->colour_description_present_flag) {
  186.             sps->color_primaries = get_bits(&h->gb, 8); /* colour_primaries */
  187.             sps->color_trc       = get_bits(&h->gb, 8); /* transfer_characteristics */
  188.             sps->colorspace      = get_bits(&h->gb, 8); /* matrix_coefficients */
  189.             if (sps->color_primaries >= AVCOL_PRI_NB)
  190.                 sps->color_primaries = AVCOL_PRI_UNSPECIFIED;
  191.             if (sps->color_trc >= AVCOL_TRC_NB)
  192.                 sps->color_trc = AVCOL_TRC_UNSPECIFIED;
  193.             if (sps->colorspace >= AVCOL_SPC_NB)
  194.                 sps->colorspace = AVCOL_SPC_UNSPECIFIED;
  195.         }
  196.     }
  197.  
  198.     /* chroma_location_info_present_flag */
  199.     if (get_bits1(&h->gb)) {
  200.         /* chroma_sample_location_type_top_field */
  201.         h->avctx->chroma_sample_location = get_ue_golomb(&h->gb) + 1;
  202.         get_ue_golomb(&h->gb);  /* chroma_sample_location_type_bottom_field */
  203.     }
  204.  
  205.     if (show_bits1(&h->gb) && get_bits_left(&h->gb) < 10) {
  206.         av_log(h->avctx, AV_LOG_WARNING, "Truncated VUI\n");
  207.         return 0;
  208.     }
  209.  
  210.     sps->timing_info_present_flag = get_bits1(&h->gb);
  211.     if (sps->timing_info_present_flag) {
  212.         sps->num_units_in_tick = get_bits_long(&h->gb, 32);
  213.         sps->time_scale        = get_bits_long(&h->gb, 32);
  214.         if (!sps->num_units_in_tick || !sps->time_scale) {
  215.             av_log(h->avctx, AV_LOG_ERROR,
  216.                    "time_scale/num_units_in_tick invalid or unsupported (%d/%d)\n",
  217.                    sps->time_scale, sps->num_units_in_tick);
  218.             return AVERROR_INVALIDDATA;
  219.         }
  220.         sps->fixed_frame_rate_flag = get_bits1(&h->gb);
  221.     }
  222.  
  223.     sps->nal_hrd_parameters_present_flag = get_bits1(&h->gb);
  224.     if (sps->nal_hrd_parameters_present_flag)
  225.         if (decode_hrd_parameters(h, sps) < 0)
  226.             return AVERROR_INVALIDDATA;
  227.     sps->vcl_hrd_parameters_present_flag = get_bits1(&h->gb);
  228.     if (sps->vcl_hrd_parameters_present_flag)
  229.         if (decode_hrd_parameters(h, sps) < 0)
  230.             return AVERROR_INVALIDDATA;
  231.     if (sps->nal_hrd_parameters_present_flag ||
  232.         sps->vcl_hrd_parameters_present_flag)
  233.         get_bits1(&h->gb);     /* low_delay_hrd_flag */
  234.     sps->pic_struct_present_flag = get_bits1(&h->gb);
  235.     if (!get_bits_left(&h->gb))
  236.         return 0;
  237.     sps->bitstream_restriction_flag = get_bits1(&h->gb);
  238.     if (sps->bitstream_restriction_flag) {
  239.         get_bits1(&h->gb);     /* motion_vectors_over_pic_boundaries_flag */
  240.         get_ue_golomb(&h->gb); /* max_bytes_per_pic_denom */
  241.         get_ue_golomb(&h->gb); /* max_bits_per_mb_denom */
  242.         get_ue_golomb(&h->gb); /* log2_max_mv_length_horizontal */
  243.         get_ue_golomb(&h->gb); /* log2_max_mv_length_vertical */
  244.         sps->num_reorder_frames = get_ue_golomb(&h->gb);
  245.         get_ue_golomb(&h->gb); /*max_dec_frame_buffering*/
  246.  
  247.         if (get_bits_left(&h->gb) < 0) {
  248.             sps->num_reorder_frames         = 0;
  249.             sps->bitstream_restriction_flag = 0;
  250.         }
  251.  
  252.         if (sps->num_reorder_frames > 16U
  253.             /* max_dec_frame_buffering || max_dec_frame_buffering > 16 */) {
  254.             av_log(h->avctx, AV_LOG_ERROR,
  255.                    "illegal num_reorder_frames %d\n", sps->num_reorder_frames);
  256.             return AVERROR_INVALIDDATA;
  257.         }
  258.     }
  259.  
  260.     if (get_bits_left(&h->gb) < 0) {
  261.         av_log(h->avctx, AV_LOG_ERROR,
  262.                "Overread VUI by %d bits\n", -get_bits_left(&h->gb));
  263.         return AVERROR_INVALIDDATA;
  264.     }
  265.  
  266.     return 0;
  267. }
  268.  
  269. static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
  270.                                 const uint8_t *jvt_list,
  271.                                 const uint8_t *fallback_list)
  272. {
  273.     int i, last = 8, next = 8;
  274.     const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
  275.     if (!get_bits1(&h->gb)) /* matrix not written, we use the predicted one */
  276.         memcpy(factors, fallback_list, size * sizeof(uint8_t));
  277.     else
  278.         for (i = 0; i < size; i++) {
  279.             if (next)
  280.                 next = (last + get_se_golomb(&h->gb)) & 0xff;
  281.             if (!i && !next) { /* matrix not written, we use the preset one */
  282.                 memcpy(factors, jvt_list, size * sizeof(uint8_t));
  283.                 break;
  284.             }
  285.             last = factors[scan[i]] = next ? next : last;
  286.         }
  287. }
  288.  
  289. static void decode_scaling_matrices(H264Context *h, SPS *sps,
  290.                                     PPS *pps, int is_sps,
  291.                                     uint8_t(*scaling_matrix4)[16],
  292.                                     uint8_t(*scaling_matrix8)[64])
  293. {
  294.     int fallback_sps = !is_sps && sps->scaling_matrix_present;
  295.     const uint8_t *fallback[4] = {
  296.         fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
  297.         fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
  298.         fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
  299.         fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
  300.     };
  301.     if (get_bits1(&h->gb)) {
  302.         sps->scaling_matrix_present |= is_sps;
  303.         decode_scaling_list(h, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]);        // Intra, Y
  304.         decode_scaling_list(h, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
  305.         decode_scaling_list(h, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
  306.         decode_scaling_list(h, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]);        // Inter, Y
  307.         decode_scaling_list(h, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
  308.         decode_scaling_list(h, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
  309.         if (is_sps || pps->transform_8x8_mode) {
  310.             decode_scaling_list(h, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
  311.             decode_scaling_list(h, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
  312.             if (sps->chroma_format_idc == 3) {
  313.                 decode_scaling_list(h, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
  314.                 decode_scaling_list(h, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
  315.                 decode_scaling_list(h, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
  316.                 decode_scaling_list(h, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
  317.             }
  318.         }
  319.     }
  320. }
  321.  
  322. int ff_h264_decode_seq_parameter_set(H264Context *h)
  323. {
  324.     int profile_idc, level_idc, constraint_set_flags = 0;
  325.     unsigned int sps_id;
  326.     int i, log2_max_frame_num_minus4;
  327.     SPS *sps;
  328.  
  329.     profile_idc           = get_bits(&h->gb, 8);
  330.     constraint_set_flags |= get_bits1(&h->gb) << 0;   // constraint_set0_flag
  331.     constraint_set_flags |= get_bits1(&h->gb) << 1;   // constraint_set1_flag
  332.     constraint_set_flags |= get_bits1(&h->gb) << 2;   // constraint_set2_flag
  333.     constraint_set_flags |= get_bits1(&h->gb) << 3;   // constraint_set3_flag
  334.     constraint_set_flags |= get_bits1(&h->gb) << 4;   // constraint_set4_flag
  335.     constraint_set_flags |= get_bits1(&h->gb) << 5;   // constraint_set5_flag
  336.     get_bits(&h->gb, 2); // reserved
  337.     level_idc = get_bits(&h->gb, 8);
  338.     sps_id    = get_ue_golomb_31(&h->gb);
  339.  
  340.     if (sps_id >= MAX_SPS_COUNT) {
  341.         av_log(h->avctx, AV_LOG_ERROR, "sps_id (%d) out of range\n", sps_id);
  342.         return AVERROR_INVALIDDATA;
  343.     }
  344.     sps = av_mallocz(sizeof(SPS));
  345.     if (!sps)
  346.         return AVERROR(ENOMEM);
  347.  
  348.     sps->time_offset_length   = 24;
  349.     sps->profile_idc          = profile_idc;
  350.     sps->constraint_set_flags = constraint_set_flags;
  351.     sps->level_idc            = level_idc;
  352.     sps->full_range           = -1;
  353.  
  354.     memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
  355.     memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
  356.     sps->scaling_matrix_present = 0;
  357.     sps->colorspace = 2; //AVCOL_SPC_UNSPECIFIED
  358.  
  359.     if (sps->profile_idc == 100 || sps->profile_idc == 110 ||
  360.         sps->profile_idc == 122 || sps->profile_idc == 244 ||
  361.         sps->profile_idc ==  44 || sps->profile_idc ==  83 ||
  362.         sps->profile_idc ==  86 || sps->profile_idc == 118 ||
  363.         sps->profile_idc == 128 || sps->profile_idc == 144) {
  364.         sps->chroma_format_idc = get_ue_golomb_31(&h->gb);
  365.         if (sps->chroma_format_idc > 3U) {
  366.             av_log(h->avctx, AV_LOG_ERROR,
  367.                    "chroma_format_idc %d is illegal\n",
  368.                    sps->chroma_format_idc);
  369.             goto fail;
  370.         } else if (sps->chroma_format_idc == 3) {
  371.             sps->residual_color_transform_flag = get_bits1(&h->gb);
  372.             if (sps->residual_color_transform_flag) {
  373.                 av_log(h->avctx, AV_LOG_ERROR, "separate color planes are not supported\n");
  374.                 goto fail;
  375.             }
  376.         }
  377.         sps->bit_depth_luma   = get_ue_golomb(&h->gb) + 8;
  378.         sps->bit_depth_chroma = get_ue_golomb(&h->gb) + 8;
  379.         if (sps->bit_depth_luma > 14U || sps->bit_depth_chroma > 14U || sps->bit_depth_luma != sps->bit_depth_chroma) {
  380.             av_log(h->avctx, AV_LOG_ERROR, "illegal bit depth value (%d, %d)\n",
  381.                    sps->bit_depth_luma, sps->bit_depth_chroma);
  382.             goto fail;
  383.         }
  384.         sps->transform_bypass = get_bits1(&h->gb);
  385.         decode_scaling_matrices(h, sps, NULL, 1,
  386.                                 sps->scaling_matrix4, sps->scaling_matrix8);
  387.     } else {
  388.         sps->chroma_format_idc = 1;
  389.         sps->bit_depth_luma    = 8;
  390.         sps->bit_depth_chroma  = 8;
  391.     }
  392.  
  393.     log2_max_frame_num_minus4 = get_ue_golomb(&h->gb);
  394.     if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||
  395.         log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {
  396.         av_log(h->avctx, AV_LOG_ERROR,
  397.                "log2_max_frame_num_minus4 out of range (0-12): %d\n",
  398.                log2_max_frame_num_minus4);
  399.         goto fail;
  400.     }
  401.     sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;
  402.  
  403.     sps->poc_type = get_ue_golomb_31(&h->gb);
  404.  
  405.     if (sps->poc_type == 0) { // FIXME #define
  406.         unsigned t = get_ue_golomb(&h->gb);
  407.         if (t>12) {
  408.             av_log(h->avctx, AV_LOG_ERROR, "log2_max_poc_lsb (%d) is out of range\n", t);
  409.             goto fail;
  410.         }
  411.         sps->log2_max_poc_lsb = t + 4;
  412.     } else if (sps->poc_type == 1) { // FIXME #define
  413.         sps->delta_pic_order_always_zero_flag = get_bits1(&h->gb);
  414.         sps->offset_for_non_ref_pic           = get_se_golomb(&h->gb);
  415.         sps->offset_for_top_to_bottom_field   = get_se_golomb(&h->gb);
  416.         sps->poc_cycle_length                 = get_ue_golomb(&h->gb);
  417.  
  418.         if ((unsigned)sps->poc_cycle_length >=
  419.             FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {
  420.             av_log(h->avctx, AV_LOG_ERROR,
  421.                    "poc_cycle_length overflow %u\n", sps->poc_cycle_length);
  422.             goto fail;
  423.         }
  424.  
  425.         for (i = 0; i < sps->poc_cycle_length; i++)
  426.             sps->offset_for_ref_frame[i] = get_se_golomb(&h->gb);
  427.     } else if (sps->poc_type != 2) {
  428.         av_log(h->avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
  429.         goto fail;
  430.     }
  431.  
  432.     sps->ref_frame_count = get_ue_golomb_31(&h->gb);
  433.     if (h->avctx->codec_tag == MKTAG('S', 'M', 'V', '2'))
  434.         sps->ref_frame_count = FFMAX(2, sps->ref_frame_count);
  435.     if (sps->ref_frame_count > MAX_PICTURE_COUNT - 2 ||
  436.         sps->ref_frame_count > 16U) {
  437.         av_log(h->avctx, AV_LOG_ERROR, "too many reference frames\n");
  438.         goto fail;
  439.     }
  440.     sps->gaps_in_frame_num_allowed_flag = get_bits1(&h->gb);
  441.     sps->mb_width                       = get_ue_golomb(&h->gb) + 1;
  442.     sps->mb_height                      = get_ue_golomb(&h->gb) + 1;
  443.     if ((unsigned)sps->mb_width  >= INT_MAX / 16 ||
  444.         (unsigned)sps->mb_height >= INT_MAX / 16 ||
  445.         av_image_check_size(16 * sps->mb_width,
  446.                             16 * sps->mb_height, 0, h->avctx)) {
  447.         av_log(h->avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
  448.         goto fail;
  449.     }
  450.  
  451.     sps->frame_mbs_only_flag = get_bits1(&h->gb);
  452.     if (!sps->frame_mbs_only_flag)
  453.         sps->mb_aff = get_bits1(&h->gb);
  454.     else
  455.         sps->mb_aff = 0;
  456.  
  457.     sps->direct_8x8_inference_flag = get_bits1(&h->gb);
  458.  
  459. #ifndef ALLOW_INTERLACE
  460.     if (sps->mb_aff)
  461.         av_log(h->avctx, AV_LOG_ERROR,
  462.                "MBAFF support not included; enable it at compile-time.\n");
  463. #endif
  464.     sps->crop = get_bits1(&h->gb);
  465.     if (sps->crop) {
  466.         int crop_left   = get_ue_golomb(&h->gb);
  467.         int crop_right  = get_ue_golomb(&h->gb);
  468.         int crop_top    = get_ue_golomb(&h->gb);
  469.         int crop_bottom = get_ue_golomb(&h->gb);
  470.         int width  = 16 * sps->mb_width;
  471.         int height = 16 * sps->mb_height * (2 - sps->frame_mbs_only_flag);
  472.  
  473.         if (h->avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) {
  474.             av_log(h->avctx, AV_LOG_DEBUG, "discarding sps cropping, original "
  475.                                            "values are l:%u r:%u t:%u b:%u\n",
  476.                    crop_left, crop_right, crop_top, crop_bottom);
  477.  
  478.             sps->crop_left   =
  479.             sps->crop_right  =
  480.             sps->crop_top    =
  481.             sps->crop_bottom = 0;
  482.         } else {
  483.             int vsub   = (sps->chroma_format_idc == 1) ? 1 : 0;
  484.             int hsub   = (sps->chroma_format_idc == 1 ||
  485.                           sps->chroma_format_idc == 2) ? 1 : 0;
  486.             int step_x = 1 << hsub;
  487.             int step_y = (2 - sps->frame_mbs_only_flag) << vsub;
  488.  
  489.             if (crop_left & (0x1F >> (sps->bit_depth_luma > 8)) &&
  490.                 !(h->avctx->flags & CODEC_FLAG_UNALIGNED)) {
  491.                 crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));
  492.                 av_log(h->avctx, AV_LOG_WARNING,
  493.                        "Reducing left cropping to %d "
  494.                        "chroma samples to preserve alignment.\n",
  495.                        crop_left);
  496.             }
  497.  
  498.             if (crop_left  > (unsigned)INT_MAX / 4 / step_x ||
  499.                 crop_right > (unsigned)INT_MAX / 4 / step_x ||
  500.                 crop_top   > (unsigned)INT_MAX / 4 / step_y ||
  501.                 crop_bottom> (unsigned)INT_MAX / 4 / step_y ||
  502.                 (crop_left + crop_right ) * step_x >= width ||
  503.                 (crop_top  + crop_bottom) * step_y >= height
  504.             ) {
  505.                 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);
  506.                 goto fail;
  507.             }
  508.  
  509.             sps->crop_left   = crop_left   * step_x;
  510.             sps->crop_right  = crop_right  * step_x;
  511.             sps->crop_top    = crop_top    * step_y;
  512.             sps->crop_bottom = crop_bottom * step_y;
  513.         }
  514.     } else {
  515.         sps->crop_left   =
  516.         sps->crop_right  =
  517.         sps->crop_top    =
  518.         sps->crop_bottom =
  519.         sps->crop        = 0;
  520.     }
  521.  
  522.     sps->vui_parameters_present_flag = get_bits1(&h->gb);
  523.     if (sps->vui_parameters_present_flag)
  524.         if (decode_vui_parameters(h, sps) < 0)
  525.             goto fail;
  526.  
  527.     if (!sps->sar.den)
  528.         sps->sar.den = 1;
  529.  
  530.     if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
  531.         static const char csp[4][5] = { "Gray", "420", "422", "444" };
  532.         av_log(h->avctx, AV_LOG_DEBUG,
  533.                "sps:%u profile:%d/%d poc:%d ref:%d %dx%d %s %s crop:%d/%d/%d/%d %s %s %d/%d b%d reo:%d\n",
  534.                sps_id, sps->profile_idc, sps->level_idc,
  535.                sps->poc_type,
  536.                sps->ref_frame_count,
  537.                sps->mb_width, sps->mb_height,
  538.                sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
  539.                sps->direct_8x8_inference_flag ? "8B8" : "",
  540.                sps->crop_left, sps->crop_right,
  541.                sps->crop_top, sps->crop_bottom,
  542.                sps->vui_parameters_present_flag ? "VUI" : "",
  543.                csp[sps->chroma_format_idc],
  544.                sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
  545.                sps->timing_info_present_flag ? sps->time_scale : 0,
  546.                sps->bit_depth_luma,
  547.                h->sps.bitstream_restriction_flag ? sps->num_reorder_frames : -1
  548.                );
  549.     }
  550.     sps->new = 1;
  551.  
  552.     av_free(h->sps_buffers[sps_id]);
  553.     h->sps_buffers[sps_id] = sps;
  554.  
  555.     return 0;
  556.  
  557. fail:
  558.     av_free(sps);
  559.     return -1;
  560. }
  561.  
  562. static void build_qp_table(PPS *pps, int t, int index, const int depth)
  563. {
  564.     int i;
  565.     const int max_qp = 51 + 6 * (depth - 8);
  566.     for (i = 0; i < max_qp + 1; i++)
  567.         pps->chroma_qp_table[t][i] =
  568.             ff_h264_chroma_qp[depth - 8][av_clip(i + index, 0, max_qp)];
  569. }
  570.  
  571. static int more_rbsp_data_in_pps(H264Context *h, PPS *pps)
  572. {
  573.     const SPS *sps = h->sps_buffers[pps->sps_id];
  574.     int profile_idc = sps->profile_idc;
  575.  
  576.     if ((profile_idc == 66 || profile_idc == 77 ||
  577.          profile_idc == 88) && (sps->constraint_set_flags & 7)) {
  578.         av_log(h->avctx, AV_LOG_VERBOSE,
  579.                "Current profile doesn't provide more RBSP data in PPS, skipping\n");
  580.         return 0;
  581.     }
  582.  
  583.     return 1;
  584. }
  585.  
  586. int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
  587. {
  588.     unsigned int pps_id = get_ue_golomb(&h->gb);
  589.     PPS *pps;
  590.     SPS *sps;
  591.     int qp_bd_offset;
  592.     int bits_left;
  593.  
  594.     if (pps_id >= MAX_PPS_COUNT) {
  595.         av_log(h->avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
  596.         return AVERROR_INVALIDDATA;
  597.     }
  598.  
  599.     pps = av_mallocz(sizeof(PPS));
  600.     if (!pps)
  601.         return AVERROR(ENOMEM);
  602.     pps->sps_id = get_ue_golomb_31(&h->gb);
  603.     if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
  604.         h->sps_buffers[pps->sps_id] == NULL) {
  605.         av_log(h->avctx, AV_LOG_ERROR, "sps_id out of range\n");
  606.         goto fail;
  607.     }
  608.     sps = h->sps_buffers[pps->sps_id];
  609.     qp_bd_offset = 6 * (sps->bit_depth_luma - 8);
  610.     if (sps->bit_depth_luma > 14) {
  611.         av_log(h->avctx, AV_LOG_ERROR,
  612.                "Invalid luma bit depth=%d\n",
  613.                sps->bit_depth_luma);
  614.         goto fail;
  615.     } else if (sps->bit_depth_luma == 11 || sps->bit_depth_luma == 13) {
  616.         av_log(h->avctx, AV_LOG_ERROR,
  617.                "Unimplemented luma bit depth=%d\n",
  618.                sps->bit_depth_luma);
  619.         goto fail;
  620.     }
  621.  
  622.     pps->cabac             = get_bits1(&h->gb);
  623.     pps->pic_order_present = get_bits1(&h->gb);
  624.     pps->slice_group_count = get_ue_golomb(&h->gb) + 1;
  625.     if (pps->slice_group_count > 1) {
  626.         pps->mb_slice_group_map_type = get_ue_golomb(&h->gb);
  627.         av_log(h->avctx, AV_LOG_ERROR, "FMO not supported\n");
  628.         switch (pps->mb_slice_group_map_type) {
  629.         case 0:
  630. #if 0
  631.     |       for (i = 0; i <= num_slice_groups_minus1; i++)  |   |      |
  632.     |           run_length[i]                               |1  |ue(v) |
  633. #endif
  634.             break;
  635.         case 2:
  636. #if 0
  637.     |       for (i = 0; i < num_slice_groups_minus1; i++) { |   |      |
  638.     |           top_left_mb[i]                              |1  |ue(v) |
  639.     |           bottom_right_mb[i]                          |1  |ue(v) |
  640.     |       }                                               |   |      |
  641. #endif
  642.             break;
  643.         case 3:
  644.         case 4:
  645.         case 5:
  646. #if 0
  647.     |       slice_group_change_direction_flag               |1  |u(1)  |
  648.     |       slice_group_change_rate_minus1                  |1  |ue(v) |
  649. #endif
  650.             break;
  651.         case 6:
  652. #if 0
  653.     |       slice_group_id_cnt_minus1                       |1  |ue(v) |
  654.     |       for (i = 0; i <= slice_group_id_cnt_minus1; i++)|   |      |
  655.     |           slice_group_id[i]                           |1  |u(v)  |
  656. #endif
  657.             break;
  658.         }
  659.     }
  660.     pps->ref_count[0] = get_ue_golomb(&h->gb) + 1;
  661.     pps->ref_count[1] = get_ue_golomb(&h->gb) + 1;
  662.     if (pps->ref_count[0] - 1 > 32 - 1 || pps->ref_count[1] - 1 > 32 - 1) {
  663.         av_log(h->avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
  664.         goto fail;
  665.     }
  666.  
  667.     pps->weighted_pred                        = get_bits1(&h->gb);
  668.     pps->weighted_bipred_idc                  = get_bits(&h->gb, 2);
  669.     pps->init_qp                              = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
  670.     pps->init_qs                              = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
  671.     pps->chroma_qp_index_offset[0]            = get_se_golomb(&h->gb);
  672.     pps->deblocking_filter_parameters_present = get_bits1(&h->gb);
  673.     pps->constrained_intra_pred               = get_bits1(&h->gb);
  674.     pps->redundant_pic_cnt_present            = get_bits1(&h->gb);
  675.  
  676.     pps->transform_8x8_mode = 0;
  677.     // contents of sps/pps can change even if id doesn't, so reinit
  678.     h->dequant_coeff_pps = -1;
  679.     memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4,
  680.            sizeof(pps->scaling_matrix4));
  681.     memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8,
  682.            sizeof(pps->scaling_matrix8));
  683.  
  684.     bits_left = bit_length - get_bits_count(&h->gb);
  685.     if (bits_left > 0 && more_rbsp_data_in_pps(h, pps)) {
  686.         pps->transform_8x8_mode = get_bits1(&h->gb);
  687.         decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0,
  688.                                 pps->scaling_matrix4, pps->scaling_matrix8);
  689.         // second_chroma_qp_index_offset
  690.         pps->chroma_qp_index_offset[1] = get_se_golomb(&h->gb);
  691.     } else {
  692.         pps->chroma_qp_index_offset[1] = pps->chroma_qp_index_offset[0];
  693.     }
  694.  
  695.     build_qp_table(pps, 0, pps->chroma_qp_index_offset[0], sps->bit_depth_luma);
  696.     build_qp_table(pps, 1, pps->chroma_qp_index_offset[1], sps->bit_depth_luma);
  697.     if (pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
  698.         pps->chroma_qp_diff = 1;
  699.  
  700.     if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
  701.         av_log(h->avctx, AV_LOG_DEBUG,
  702.                "pps:%u sps:%u %s slice_groups:%d ref:%d/%d %s qp:%d/%d/%d/%d %s %s %s %s\n",
  703.                pps_id, pps->sps_id,
  704.                pps->cabac ? "CABAC" : "CAVLC",
  705.                pps->slice_group_count,
  706.                pps->ref_count[0], pps->ref_count[1],
  707.                pps->weighted_pred ? "weighted" : "",
  708.                pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
  709.                pps->deblocking_filter_parameters_present ? "LPAR" : "",
  710.                pps->constrained_intra_pred ? "CONSTR" : "",
  711.                pps->redundant_pic_cnt_present ? "REDU" : "",
  712.                pps->transform_8x8_mode ? "8x8DCT" : "");
  713.     }
  714.  
  715.     av_free(h->pps_buffers[pps_id]);
  716.     h->pps_buffers[pps_id] = pps;
  717.     return 0;
  718.  
  719. fail:
  720.     av_free(pps);
  721.     return -1;
  722. }
  723.