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FFmpeg/libavcodec/cbs_h264_syntax_template.c

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  1. /*

  2.  * This file is part of FFmpeg.

  3.  *

  4.  * FFmpeg is free software; you can redistribute it and/or

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

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

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

  8.  *

  9.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  12.  * Lesser General Public License for more details.

  13.  *

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

  15.  * License along with FFmpeg; if not, write to the Free Software

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

  17.  */

  18. 

  19. static int FUNC(rbsp_trailing_bits)(CodedBitstreamContext *ctx, RWContext *rw)

  20. {

  21.     int err;

  22. 

  23.     fixed(1, rbsp_stop_one_bit, 1);

  24.     while (byte_alignment(rw) != 0)

  25.         fixed(1, rbsp_alignment_zero_bit, 0);

  26. 

  27.     return 0;

  28. }

  29. 

  30. static int FUNC(nal_unit_header)(CodedBitstreamContext *ctx, RWContext *rw,

  31.                                  H264RawNALUnitHeader *current,

  32.                                  uint32_t valid_type_mask)

  33. {

  34.     int err;

  35. 

  36.     u(1, forbidden_zero_bit, 0, 0);

  37.     u(2, nal_ref_idc,        0, 3);

  38.     u(5, nal_unit_type,      0, 31);

  39. 

  40.     if (!(1 << current->nal_unit_type & valid_type_mask)) {

  41.         av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid NAL unit type %d.\n",

  42.                current->nal_unit_type);

  43.         return AVERROR_INVALIDDATA;

  44.     }

  45. 

  46.     if (current->nal_unit_type == 14 ||

  47.         current->nal_unit_type == 20 ||

  48.         current->nal_unit_type == 21) {

  49.         if (current->nal_unit_type != 21)

  50.             flag(svc_extension_flag);

  51.         else

  52.             flag(avc_3d_extension_flag);

  53. 

  54.         if (current->svc_extension_flag) {

  55.             av_log(ctx->log_ctx, AV_LOG_ERROR, "SVC not supported.\n");

  56.             return AVERROR_PATCHWELCOME;

  57. 

  58.         } else if (current->avc_3d_extension_flag) {

  59.             av_log(ctx->log_ctx, AV_LOG_ERROR, "3DAVC not supported.\n");

  60.             return AVERROR_PATCHWELCOME;

  61. 

  62.         } else {

  63.             av_log(ctx->log_ctx, AV_LOG_ERROR, "MVC not supported.\n");

  64.             return AVERROR_PATCHWELCOME;

  65.         }

  66.     }

  67. 

  68.     return 0;

  69. }

  70. 

  71. static int FUNC(scaling_list)(CodedBitstreamContext *ctx, RWContext *rw,

  72.                               H264RawScalingList *current,

  73.                               int size_of_scaling_list)

  74. {

  75.     int err, i, scale;

  76. 

  77.     scale = 8;

  78.     for (i = 0; i < size_of_scaling_list; i++) {

  79.         ses(delta_scale[i], -128, +127, 1, i);

  80.         scale = (scale + current->delta_scale[i] + 256) % 256;

  81.         if (scale == 0)

  82.             break;

  83.     }

  84. 

  85.     return 0;

  86. }

  87. 

  88. static int FUNC(hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,

  89.                                 H264RawHRD *current)

  90. {

  91.     int err, i;

  92. 

  93.     ue(cpb_cnt_minus1, 0, 31);

  94.     u(4, bit_rate_scale, 0, 15);

  95.     u(4, cpb_size_scale, 0, 15);

  96. 

  97.     for (i = 0; i <= current->cpb_cnt_minus1; i++) {

  98.         ues(bit_rate_value_minus1[i], 0, UINT32_MAX - 1, 1, i);

  99.         ues(cpb_size_value_minus1[i], 0, UINT32_MAX - 1, 1, i);

  100.         flags(cbr_flag[i], 1, i);

  101.     }

  102. 

  103.     u(5, initial_cpb_removal_delay_length_minus1, 0, 31);

  104.     u(5, cpb_removal_delay_length_minus1,         0, 31);

  105.     u(5, dpb_output_delay_length_minus1,          0, 31);

  106.     u(5, time_offset_length,                      0, 31);

  107. 

  108.     return 0;

  109. }

  110. 

  111. static int FUNC(vui_parameters)(CodedBitstreamContext *ctx, RWContext *rw,

  112.                                 H264RawVUI *current, H264RawSPS *sps)

  113. {

  114.     int err;

  115. 

  116.     flag(aspect_ratio_info_present_flag);

  117.     if (current->aspect_ratio_info_present_flag) {

  118.         u(8, aspect_ratio_idc, 0, 255);

  119.         if (current->aspect_ratio_idc == 255) {

  120.             u(16, sar_width,  0, 65535);

  121.             u(16, sar_height, 0, 65535);

  122.         }

  123.     } else {

  124.         infer(aspect_ratio_idc, 0);

  125.     }

  126. 

  127.     flag(overscan_info_present_flag);

  128.     if (current->overscan_info_present_flag)

  129.         flag(overscan_appropriate_flag);

  130. 

  131.     flag(video_signal_type_present_flag);

  132.     if (current->video_signal_type_present_flag) {

  133.         u(3, video_format, 0, 7);

  134.         flag(video_full_range_flag);

  135.         flag(colour_description_present_flag);

  136.         if (current->colour_description_present_flag) {

  137.             u(8, colour_primaries,         0, 255);

  138.             u(8, transfer_characteristics, 0, 255);

  139.             u(8, matrix_coefficients,      0, 255);

  140.         }

  141.     } else {

  142.         infer(video_format,             5);

  143.         infer(video_full_range_flag,    0);

  144.         infer(colour_primaries,         2);

  145.         infer(transfer_characteristics, 2);

  146.         infer(matrix_coefficients,      2);

  147.     }

  148. 

  149.     flag(chroma_loc_info_present_flag);

  150.     if (current->chroma_loc_info_present_flag) {

  151.         ue(chroma_sample_loc_type_top_field,    0, 5);

  152.         ue(chroma_sample_loc_type_bottom_field, 0, 5);

  153.     } else {

  154.         infer(chroma_sample_loc_type_top_field,    0);

  155.         infer(chroma_sample_loc_type_bottom_field, 0);

  156.     }

  157. 

  158.     flag(timing_info_present_flag);

  159.     if (current->timing_info_present_flag) {

  160.         u(32, num_units_in_tick, 1, UINT32_MAX);

  161.         u(32, time_scale,        1, UINT32_MAX);

  162.         flag(fixed_frame_rate_flag);

  163.     } else {

  164.         infer(fixed_frame_rate_flag, 0);

  165.     }

  166. 

  167.     flag(nal_hrd_parameters_present_flag);

  168.     if (current->nal_hrd_parameters_present_flag)

  169.         CHECK(FUNC(hrd_parameters)(ctx, rw, &current->nal_hrd_parameters));

  170. 

  171.     flag(vcl_hrd_parameters_present_flag);

  172.     if (current->vcl_hrd_parameters_present_flag)

  173.         CHECK(FUNC(hrd_parameters)(ctx, rw, &current->vcl_hrd_parameters));

  174. 

  175.     if (current->nal_hrd_parameters_present_flag ||

  176.         current->vcl_hrd_parameters_present_flag)

  177.         flag(low_delay_hrd_flag);

  178.     else

  179.         infer(low_delay_hrd_flag, 1 - current->fixed_frame_rate_flag);

  180. 

  181.     flag(pic_struct_present_flag);

  182. 

  183.     flag(bitstream_restriction_flag);

  184.     if (current->bitstream_restriction_flag) {

  185.         flag(motion_vectors_over_pic_boundaries_flag);

  186.         ue(max_bytes_per_pic_denom, 0, 16);

  187.         ue(max_bits_per_mb_denom,   0, 16);

  188.         ue(log2_max_mv_length_horizontal, 0, 16);

  189.         ue(log2_max_mv_length_vertical,   0, 16);

  190.         ue(max_num_reorder_frames,  0, H264_MAX_DPB_FRAMES);

  191.         ue(max_dec_frame_buffering, 0, H264_MAX_DPB_FRAMES);

  192.     } else {

  193.         infer(motion_vectors_over_pic_boundaries_flag, 1);

  194.         infer(max_bytes_per_pic_denom, 2);

  195.         infer(max_bits_per_mb_denom,   1);

  196.         infer(log2_max_mv_length_horizontal, 16);

  197.         infer(log2_max_mv_length_vertical,   16);

  198. 

  199.         if ((sps->profile_idc ==  44 || sps->profile_idc ==  86 ||

  200.              sps->profile_idc == 110 || sps->profile_idc == 110 ||

  201.              sps->profile_idc == 122 || sps->profile_idc == 244) &&

  202.             sps->constraint_set3_flag) {

  203.             infer(max_num_reorder_frames,  0);

  204.             infer(max_dec_frame_buffering, 0);

  205.         } else {

  206.             infer(max_num_reorder_frames,  H264_MAX_DPB_FRAMES);

  207.             infer(max_dec_frame_buffering, H264_MAX_DPB_FRAMES);

  208.         }

  209.     }

  210. 

  211.     return 0;

  212. }

  213. 

  214. static int FUNC(sps)(CodedBitstreamContext *ctx, RWContext *rw,

  215.                      H264RawSPS *current)

  216. {

  217.     int err, i;

  218. 

  219.     HEADER("Sequence Parameter Set");

  220. 

  221.     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,

  222.                                 1 << H264_NAL_SPS));

  223. 

  224.     u(8, profile_idc, 0, 255);

  225. 

  226.     flag(constraint_set0_flag);

  227.     flag(constraint_set1_flag);

  228.     flag(constraint_set2_flag);

  229.     flag(constraint_set3_flag);

  230.     flag(constraint_set4_flag);

  231.     flag(constraint_set5_flag);

  232. 

  233.     u(2, reserved_zero_2bits,  0, 0);

  234. 

  235.     u(8, level_idc, 0, 255);

  236. 

  237.     ue(seq_parameter_set_id, 0, 31);

  238. 

  239.     if (current->profile_idc == 100 || current->profile_idc == 110 ||

  240.         current->profile_idc == 122 || current->profile_idc == 244 ||

  241.         current->profile_idc ==  44 || current->profile_idc ==  83 ||

  242.         current->profile_idc ==  86 || current->profile_idc == 118 ||

  243.         current->profile_idc == 128 || current->profile_idc == 138) {

  244.         ue(chroma_format_idc, 0, 3);

  245. 

  246.         if (current->chroma_format_idc == 3)

  247.             flag(separate_colour_plane_flag);

  248.         else

  249.             infer(separate_colour_plane_flag, 0);

  250. 

  251.         ue(bit_depth_luma_minus8,   0, 6);

  252.         ue(bit_depth_chroma_minus8, 0, 6);

  253. 

  254.         flag(qpprime_y_zero_transform_bypass_flag);

  255. 

  256.         flag(seq_scaling_matrix_present_flag);

  257.         if (current->seq_scaling_matrix_present_flag) {

  258.             for (i = 0; i < ((current->chroma_format_idc != 3) ? 8 : 12); i++) {

  259.                 flags(seq_scaling_list_present_flag[i], 1, i);

  260.                 if (current->seq_scaling_list_present_flag[i]) {

  261.                     if (i < 6)

  262.                         CHECK(FUNC(scaling_list)(ctx, rw,

  263.                                                  &current->scaling_list_4x4[i],

  264.                                                  16));

  265.                     else

  266.                         CHECK(FUNC(scaling_list)(ctx, rw,

  267.                                                  &current->scaling_list_8x8[i - 6],

  268.                                                  64));

  269.                 }

  270.             }

  271.         }

  272.     } else {

  273.         infer(chroma_format_idc, current->profile_idc == 183 ? 0 : 1);

  274. 

  275.         infer(separate_colour_plane_flag, 0);

  276.         infer(bit_depth_luma_minus8,      0);

  277.         infer(bit_depth_chroma_minus8,    0);

  278.     }

  279. 

  280.     ue(log2_max_frame_num_minus4, 0, 12);

  281.     ue(pic_order_cnt_type, 0, 2);

  282. 

  283.     if (current->pic_order_cnt_type == 0) {

  284.         ue(log2_max_pic_order_cnt_lsb_minus4, 0, 12);

  285.     } else if (current->pic_order_cnt_type == 1) {

  286.         flag(delta_pic_order_always_zero_flag);

  287.         se(offset_for_non_ref_pic,         INT32_MIN + 1, INT32_MAX);

  288.         se(offset_for_top_to_bottom_field, INT32_MIN + 1, INT32_MAX);

  289.         ue(num_ref_frames_in_pic_order_cnt_cycle, 0, 255);

  290. 

  291.         for (i = 0; i < current->num_ref_frames_in_pic_order_cnt_cycle; i++)

  292.             ses(offset_for_ref_frame[i], INT32_MIN + 1, INT32_MAX, 1, i);

  293.     }

  294. 

  295.     ue(max_num_ref_frames, 0, H264_MAX_DPB_FRAMES);

  296.     flag(gaps_in_frame_num_allowed_flag);

  297. 

  298.     ue(pic_width_in_mbs_minus1,        0, H264_MAX_MB_WIDTH);

  299.     ue(pic_height_in_map_units_minus1, 0, H264_MAX_MB_HEIGHT);

  300. 

  301.     flag(frame_mbs_only_flag);

  302.     if (!current->frame_mbs_only_flag)

  303.         flag(mb_adaptive_frame_field_flag);

  304. 

  305.     flag(direct_8x8_inference_flag);

  306. 

  307.     flag(frame_cropping_flag);

  308.     if (current->frame_cropping_flag) {

  309.         ue(frame_crop_left_offset,   0, H264_MAX_WIDTH);

  310.         ue(frame_crop_right_offset,  0, H264_MAX_WIDTH);

  311.         ue(frame_crop_top_offset,    0, H264_MAX_HEIGHT);

  312.         ue(frame_crop_bottom_offset, 0, H264_MAX_HEIGHT);

  313.     }

  314. 

  315.     flag(vui_parameters_present_flag);

  316.     if (current->vui_parameters_present_flag)

  317.         CHECK(FUNC(vui_parameters)(ctx, rw, &current->vui, current));

  318. 

  319.     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));

  320. 

  321.     return 0;

  322. }

  323. 

  324. static int FUNC(sps_extension)(CodedBitstreamContext *ctx, RWContext *rw,

  325.                                H264RawSPSExtension *current)

  326. {

  327.     int err;

  328. 

  329.     HEADER("Sequence Parameter Set Extension");

  330. 

  331.     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,

  332.                                 1 << H264_NAL_SPS_EXT));

  333. 

  334.     ue(seq_parameter_set_id, 0, 31);

  335. 

  336.     ue(aux_format_idc, 0, 3);

  337. 

  338.     if (current->aux_format_idc != 0) {

  339.         int bits;

  340. 

  341.         ue(bit_depth_aux_minus8, 0, 4);

  342.         flag(alpha_incr_flag);

  343. 

  344.         bits = current->bit_depth_aux_minus8 + 9;

  345.         u(bits, alpha_opaque_value,      0, MAX_UINT_BITS(bits));

  346.         u(bits, alpha_transparent_value, 0, MAX_UINT_BITS(bits));

  347.     }

  348. 

  349.     flag(additional_extension_flag);

  350. 

  351.     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));

  352. 

  353.     return 0;

  354. }

  355. 

  356. static int FUNC(pps)(CodedBitstreamContext *ctx, RWContext *rw,

  357.                      H264RawPPS *current)

  358. {

  359.     CodedBitstreamH264Context *h264 = ctx->priv_data;

  360.     const H264RawSPS *sps;

  361.     int err, i;

  362. 

  363.     HEADER("Picture Parameter Set");

  364. 

  365.     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,

  366.                                 1 << H264_NAL_PPS));

  367. 

  368.     ue(pic_parameter_set_id, 0, 255);

  369.     ue(seq_parameter_set_id, 0, 31);

  370. 

  371.     sps = h264->sps[current->seq_parameter_set_id];

  372.     if (!sps) {

  373.         av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",

  374.                current->seq_parameter_set_id);

  375.         return AVERROR_INVALIDDATA;

  376.     }

  377. 

  378.     flag(entropy_coding_mode_flag);

  379.     flag(bottom_field_pic_order_in_frame_present_flag);

  380. 

  381.     ue(num_slice_groups_minus1, 0, 7);

  382.     if (current->num_slice_groups_minus1 > 0) {

  383.         unsigned int pic_size;

  384.         int iGroup;

  385. 

  386.         pic_size = (sps->pic_width_in_mbs_minus1 + 1) *

  387.                    (sps->pic_height_in_map_units_minus1 + 1);

  388. 

  389.         ue(slice_group_map_type, 0, 6);

  390. 

  391.         if (current->slice_group_map_type == 0) {

  392.             for (iGroup = 0; iGroup <= current->num_slice_groups_minus1; iGroup++)

  393.                 ues(run_length_minus1[iGroup], 0, pic_size - 1, 1, iGroup);

  394. 

  395.         } else if (current->slice_group_map_type == 2) {

  396.             for (iGroup = 0; iGroup < current->num_slice_groups_minus1; iGroup++) {

  397.                 ues(top_left[iGroup],       0, pic_size - 1, 1, iGroup);

  398.                 ues(bottom_right[iGroup],

  399.                     current->top_left[iGroup], pic_size - 1, 1, iGroup);

  400.             }

  401.         } else if (current->slice_group_map_type == 3 ||

  402.                    current->slice_group_map_type == 4 ||

  403.                    current->slice_group_map_type == 5) {

  404.             flag(slice_group_change_direction_flag);

  405.             ue(slice_group_change_rate_minus1, 0, pic_size - 1);

  406.         } else if (current->slice_group_map_type == 6) {

  407.             ue(pic_size_in_map_units_minus1, pic_size - 1, pic_size - 1);

  408. 

  409.             allocate(current->slice_group_id,

  410.                      current->pic_size_in_map_units_minus1 + 1);

  411.             for (i = 0; i <= current->pic_size_in_map_units_minus1; i++)

  412.                 us(av_log2(2 * current->num_slice_groups_minus1 + 1),

  413.                    slice_group_id[i], 0, current->num_slice_groups_minus1, 1, i);

  414.         }

  415.     }

  416. 

  417.     ue(num_ref_idx_l0_default_active_minus1, 0, 31);

  418.     ue(num_ref_idx_l1_default_active_minus1, 0, 31);

  419. 

  420.     flag(weighted_pred_flag);

  421.     u(2, weighted_bipred_idc, 0, 2);

  422. 

  423.     se(pic_init_qp_minus26, -26 - 6 * sps->bit_depth_luma_minus8, +25);

  424.     se(pic_init_qs_minus26, -26, +25);

  425.     se(chroma_qp_index_offset, -12, +12);

  426. 

  427.     flag(deblocking_filter_control_present_flag);

  428.     flag(constrained_intra_pred_flag);

  429.     flag(redundant_pic_cnt_present_flag);

  430. 

  431.     if (more_rbsp_data(current->more_rbsp_data))

  432.     {

  433.         flag(transform_8x8_mode_flag);

  434. 

  435.         flag(pic_scaling_matrix_present_flag);

  436.         if (current->pic_scaling_matrix_present_flag) {

  437.             for (i = 0; i < 6 + (((sps->chroma_format_idc != 3) ? 2 : 6) *

  438.                                  current->transform_8x8_mode_flag); i++) {

  439.                 flags(pic_scaling_list_present_flag[i], 1, i);

  440.                 if (current->pic_scaling_list_present_flag[i]) {

  441.                     if (i < 6)

  442.                         CHECK(FUNC(scaling_list)(ctx, rw,

  443.                                                  &current->scaling_list_4x4[i],

  444.                                                  16));

  445.                     else

  446.                         CHECK(FUNC(scaling_list)(ctx, rw,

  447.                                                  &current->scaling_list_8x8[i - 6],

  448.                                                  64));

  449.                 }

  450.             }

  451.         }

  452. 

  453.         se(second_chroma_qp_index_offset, -12, +12);

  454.     } else {

  455.         infer(transform_8x8_mode_flag, 0);

  456.         infer(pic_scaling_matrix_present_flag, 0);

  457.         infer(second_chroma_qp_index_offset, current->chroma_qp_index_offset);

  458.     }

  459. 

  460.     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));

  461. 

  462.     return 0;

  463. }

  464. 

  465. static int FUNC(sei_buffering_period)(CodedBitstreamContext *ctx, RWContext *rw,

  466.                                       H264RawSEIBufferingPeriod *current)

  467. {

  468.     CodedBitstreamH264Context *h264 = ctx->priv_data;

  469.     const H264RawSPS *sps;

  470.     int err, i, length;

  471. 

  472.     ue(seq_parameter_set_id, 0, 31);

  473. 

  474.     sps = h264->sps[current->seq_parameter_set_id];

  475.     if (!sps) {

  476.         av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",

  477.                current->seq_parameter_set_id);

  478.         return AVERROR_INVALIDDATA;

  479.     }

  480.     h264->active_sps = sps;

  481. 

  482.     if (sps->vui.nal_hrd_parameters_present_flag) {

  483.         for (i = 0; i <= sps->vui.nal_hrd_parameters.cpb_cnt_minus1; i++) {

  484.             length = sps->vui.nal_hrd_parameters.initial_cpb_removal_delay_length_minus1 + 1;

  485.             xu(length, initial_cpb_removal_delay[SchedSelIdx],

  486.                current->nal.initial_cpb_removal_delay[i],

  487.                1, MAX_UINT_BITS(length), 1, i);

  488.             xu(length, initial_cpb_removal_delay_offset[SchedSelIdx],

  489.                current->nal.initial_cpb_removal_delay_offset[i],

  490.                0, MAX_UINT_BITS(length), 1, i);

  491.         }

  492.     }

  493. 

  494.     if (sps->vui.vcl_hrd_parameters_present_flag) {

  495.         for (i = 0; i <= sps->vui.vcl_hrd_parameters.cpb_cnt_minus1; i++) {

  496.             length = sps->vui.vcl_hrd_parameters.initial_cpb_removal_delay_length_minus1 + 1;

  497.             xu(length, initial_cpb_removal_delay[SchedSelIdx],

  498.                current->vcl.initial_cpb_removal_delay[i],

  499.                1, MAX_UINT_BITS(length), 1, i);

  500.             xu(length, initial_cpb_removal_delay_offset[SchedSelIdx],

  501.                current->vcl.initial_cpb_removal_delay_offset[i],

  502.                0, MAX_UINT_BITS(length), 1, i);

  503.         }

  504.     }

  505. 

  506.     return 0;

  507. }

  508. 

  509. static int FUNC(sei_pic_timestamp)(CodedBitstreamContext *ctx, RWContext *rw,

  510.                                    H264RawSEIPicTimestamp *current)

  511. {

  512.     CodedBitstreamH264Context *h264 = ctx->priv_data;

  513.     const H264RawSPS *sps;

  514.     uint8_t time_offset_length;

  515.     int err;

  516. 

  517.     u(2, ct_type, 0, 2);

  518.     flag(nuit_field_based_flag);

  519.     u(5, counting_type, 0, 6);

  520.     flag(full_timestamp_flag);

  521.     flag(discontinuity_flag);

  522.     flag(cnt_dropped_flag);

  523.     u(8, n_frames, 0, 255);

  524.     if (current->full_timestamp_flag) {

  525.             u(6, seconds_value, 0, 59);

  526.             u(6, minutes_value, 0, 59);

  527.             u(5, hours_value,   0, 23);

  528.     } else {

  529.         flag(seconds_flag);

  530.         if (current->seconds_flag) {

  531.             u(6, seconds_value, 0, 59);

  532.             flag(minutes_flag);

  533.             if (current->minutes_flag) {

  534.                 u(6, minutes_value, 0, 59);

  535.                 flag(hours_flag);

  536.                 if (current->hours_flag)

  537.                     u(5, hours_value, 0, 23);

  538.             }

  539.         }

  540.     }

  541. 

  542.     sps = h264->active_sps;

  543.     if (sps->vui.nal_hrd_parameters_present_flag)

  544.         time_offset_length = sps->vui.nal_hrd_parameters.time_offset_length;

  545.     else if (sps->vui.vcl_hrd_parameters_present_flag)

  546.         time_offset_length = sps->vui.vcl_hrd_parameters.time_offset_length;

  547.     else

  548.         time_offset_length = 24;

  549. 

  550.     if (time_offset_length > 0)

  551.         u(time_offset_length, time_offset,

  552.           0, MAX_UINT_BITS(time_offset_length));

  553.     else

  554.         infer(time_offset, 0);

  555. 

  556.     return 0;

  557. }

  558. 

  559. static int FUNC(sei_pic_timing)(CodedBitstreamContext *ctx, RWContext *rw,

  560.                                 H264RawSEIPicTiming *current)

  561. {

  562.     CodedBitstreamH264Context *h264 = ctx->priv_data;

  563.     const H264RawSPS *sps;

  564.     int err;

  565. 

  566.     sps = h264->active_sps;

  567.     if (!sps) {

  568.         // If there is exactly one possible SPS but it is not yet active

  569.         // then just assume that it should be the active one.

  570.         int i, k = -1;

  571.         for (i = 0; i < H264_MAX_SPS_COUNT; i++) {

  572.             if (h264->sps[i]) {

  573.                 if (k >= 0) {

  574.                     k = -1;

  575.                     break;

  576.                 }

  577.                 k = i;

  578.             }

  579.         }

  580.         if (k >= 0)

  581.             sps = h264->sps[k];

  582.     }

  583.     if (!sps) {

  584.         av_log(ctx->log_ctx, AV_LOG_ERROR,

  585.                "No active SPS for pic_timing.\n");

  586.         return AVERROR_INVALIDDATA;

  587.     }

  588. 

  589.     if (sps->vui.nal_hrd_parameters_present_flag ||

  590.         sps->vui.vcl_hrd_parameters_present_flag) {

  591.         const H264RawHRD *hrd;

  592. 

  593.         if (sps->vui.nal_hrd_parameters_present_flag)

  594.             hrd = &sps->vui.nal_hrd_parameters;

  595.         else if (sps->vui.vcl_hrd_parameters_present_flag)

  596.             hrd = &sps->vui.vcl_hrd_parameters;

  597.         else {

  598.             av_log(ctx->log_ctx, AV_LOG_ERROR,

  599.                    "No HRD parameters for pic_timing.\n");

  600.             return AVERROR_INVALIDDATA;

  601.         }

  602. 

  603.         u(hrd->cpb_removal_delay_length_minus1 + 1, cpb_removal_delay,

  604.           0, MAX_UINT_BITS(hrd->cpb_removal_delay_length_minus1 + 1));

  605.         u(hrd->dpb_output_delay_length_minus1 + 1, dpb_output_delay,

  606.           0, MAX_UINT_BITS(hrd->dpb_output_delay_length_minus1 + 1));

  607.     }

  608. 

  609.     if (sps->vui.pic_struct_present_flag) {

  610.         static const int num_clock_ts[9] = {

  611.             1, 1, 1, 2, 2, 3, 3, 2, 3

  612.         };

  613.         int i;

  614. 

  615.         u(4, pic_struct, 0, 8);

  616.         if (current->pic_struct > 8)

  617.             return AVERROR_INVALIDDATA;

  618. 

  619.         for (i = 0; i < num_clock_ts[current->pic_struct]; i++) {

  620.             flags(clock_timestamp_flag[i], 1, i);

  621.             if (current->clock_timestamp_flag[i])

  622.                 CHECK(FUNC(sei_pic_timestamp)(ctx, rw, &current->timestamp[i]));

  623.         }

  624.     }

  625. 

  626.     return 0;

  627. }

  628. 

  629. static int FUNC(sei_user_data_registered)(CodedBitstreamContext *ctx, RWContext *rw,

  630.                                           H264RawSEIUserDataRegistered *current,

  631.                                           uint32_t *payload_size)

  632. {

  633.     int err, i, j;

  634. 

  635.     u(8, itu_t_t35_country_code, 0x00, 0xff);

  636.     if (current->itu_t_t35_country_code != 0xff)

  637.         i = 1;

  638.     else {

  639.         u(8, itu_t_t35_country_code_extension_byte, 0x00, 0xff);

  640.         i = 2;

  641.     }

  642. 

  643. #ifdef READ

  644.     if (*payload_size < i) {

  645.         av_log(ctx->log_ctx, AV_LOG_ERROR,

  646.                "Invalid SEI user data registered payload.\n");

  647.         return AVERROR_INVALIDDATA;

  648.     }

  649.     current->data_length = *payload_size - i;

  650. #else

  651.     *payload_size = i + current->data_length;

  652. #endif

  653. 

  654.     allocate(current->data, current->data_length);

  655.     for (j = 0; j < current->data_length; j++)

  656.         xu(8, itu_t_t35_payload_byte[i], current->data[j], 0x00, 0xff, 1, i + j);

  657. 

  658.     return 0;

  659. }

  660. 

  661. static int FUNC(sei_user_data_unregistered)(CodedBitstreamContext *ctx, RWContext *rw,

  662.                                             H264RawSEIUserDataUnregistered *current,

  663.                                             uint32_t *payload_size)

  664. {

  665.     int err, i;

  666. 

  667. #ifdef READ

  668.     if (*payload_size < 16) {

  669.         av_log(ctx->log_ctx, AV_LOG_ERROR,

  670.                "Invalid SEI user data unregistered payload.\n");

  671.         return AVERROR_INVALIDDATA;

  672.     }

  673.     current->data_length = *payload_size - 16;

  674. #else

  675.     *payload_size = 16 + current->data_length;

  676. #endif

  677. 

  678.     for (i = 0; i < 16; i++)

  679.         us(8, uuid_iso_iec_11578[i], 0x00, 0xff, 1, i);

  680. 

  681.     allocate(current->data, current->data_length);

  682. 

  683.     for (i = 0; i < current->data_length; i++)

  684.         xu(8, user_data_payload_byte[i], current->data[i], 0x00, 0xff, 1, i);

  685. 

  686.     return 0;

  687. }

  688. 

  689. static int FUNC(sei_recovery_point)(CodedBitstreamContext *ctx, RWContext *rw,

  690.                                     H264RawSEIRecoveryPoint *current)

  691. {

  692.     int err;

  693. 

  694.     ue(recovery_frame_cnt, 0, 65535);

  695.     flag(exact_match_flag);

  696.     flag(broken_link_flag);

  697.     u(2, changing_slice_group_idc, 0, 2);

  698. 

  699.     return 0;

  700. }

  701. 

  702. static int FUNC(sei_display_orientation)(CodedBitstreamContext *ctx, RWContext *rw,

  703.                                          H264RawSEIDisplayOrientation *current)

  704. {

  705.     int err;

  706. 

  707.     flag(display_orientation_cancel_flag);

  708.     if (!current->display_orientation_cancel_flag) {

  709.         flag(hor_flip);

  710.         flag(ver_flip);

  711.         u(16, anticlockwise_rotation, 0, 65535);

  712.         ue(display_orientation_repetition_period, 0, 16384);

  713.         flag(display_orientation_extension_flag);

  714.     }

  715. 

  716.     return 0;

  717. }

  718. 

  719. static int FUNC(sei_payload)(CodedBitstreamContext *ctx, RWContext *rw,

  720.                              H264RawSEIPayload *current)

  721. {

  722.     int err, i;

  723.     int start_position, end_position;

  724. 

  725. #ifdef READ

  726.     start_position = get_bits_count(rw);

  727. #else

  728.     start_position = put_bits_count(rw);

  729. #endif

  730. 

  731.     switch (current->payload_type) {

  732.     case H264_SEI_TYPE_BUFFERING_PERIOD:

  733.         CHECK(FUNC(sei_buffering_period)

  734.               (ctx, rw, &current->payload.buffering_period));

  735.         break;

  736.     case H264_SEI_TYPE_PIC_TIMING:

  737.         CHECK(FUNC(sei_pic_timing)

  738.               (ctx, rw, &current->payload.pic_timing));

  739.         break;

  740.     case H264_SEI_TYPE_FILLER_PAYLOAD:

  741.         {

  742.             for (i = 0; i  < current->payload_size; i++)

  743.                 fixed(8, ff_byte, 0xff);

  744.         }

  745.         break;

  746.     case H264_SEI_TYPE_USER_DATA_REGISTERED:

  747.         CHECK(FUNC(sei_user_data_registered)

  748.               (ctx, rw, &current->payload.user_data_registered, &current->payload_size));

  749.         break;

  750.     case H264_SEI_TYPE_USER_DATA_UNREGISTERED:

  751.         CHECK(FUNC(sei_user_data_unregistered)

  752.               (ctx, rw, &current->payload.user_data_unregistered, &current->payload_size));

  753.         break;

  754.     case H264_SEI_TYPE_RECOVERY_POINT:

  755.         CHECK(FUNC(sei_recovery_point)

  756.               (ctx, rw, &current->payload.recovery_point));

  757.         break;

  758.     case H264_SEI_TYPE_DISPLAY_ORIENTATION:

  759.         CHECK(FUNC(sei_display_orientation)

  760.               (ctx, rw, &current->payload.display_orientation));

  761.         break;

  762.     default:

  763.         {

  764.             allocate(current->payload.other.data, current->payload_size);

  765.             for (i = 0; i < current->payload_size; i++)

  766.                 xu(8, payload_byte[i], current->payload.other.data[i], 0, 255, 1, i);

  767.         }

  768.     }

  769. 

  770.     if (byte_alignment(rw)) {

  771.         fixed(1, bit_equal_to_one, 1);

  772.         while (byte_alignment(rw))

  773.             fixed(1, bit_equal_to_zero, 0);

  774.     }

  775. 

  776. #ifdef READ

  777.     end_position = get_bits_count(rw);

  778.     if (end_position < start_position + 8 * current->payload_size) {

  779.         av_log(ctx->log_ctx, AV_LOG_ERROR, "Incorrect SEI payload length: "

  780.                "header %"PRIu32" bits, actually %d bits.\n",

  781.                8 * current->payload_size,

  782.                end_position - start_position);

  783.         return AVERROR_INVALIDDATA;

  784.     }

  785. #else

  786.     end_position = put_bits_count(rw);

  787.     current->payload_size = (end_position - start_position) / 8;

  788. #endif

  789. 

  790.     return 0;

  791. }

  792. 

  793. static int FUNC(sei)(CodedBitstreamContext *ctx, RWContext *rw,

  794.                      H264RawSEI *current)

  795. {

  796.     int err, k;

  797. 

  798.     HEADER("Supplemental Enhancement Information");

  799. 

  800.     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,

  801.                                 1 << H264_NAL_SEI));

  802. 

  803. #ifdef READ

  804.     for (k = 0; k < H264_MAX_SEI_PAYLOADS; k++) {

  805.         uint32_t payload_type = 0;

  806.         uint32_t payload_size = 0;

  807.         uint32_t tmp;

  808. 

  809.         while (show_bits(rw, 8) == 0xff) {

  810.             fixed(8, ff_byte, 0xff);

  811.             payload_type += 255;

  812.         }

  813.         xu(8, last_payload_type_byte, tmp, 0, 254, 0);

  814.         payload_type += tmp;

  815. 

  816.         while (show_bits(rw, 8) == 0xff) {

  817.             fixed(8, ff_byte, 0xff);

  818.             payload_size += 255;

  819.         }

  820.         xu(8, last_payload_size_byte, tmp, 0, 254, 0);

  821.         payload_size += tmp;

  822. 

  823.         current->payload[k].payload_type = payload_type;

  824.         current->payload[k].payload_size = payload_size;

  825. 

  826.         CHECK(FUNC(sei_payload)(ctx, rw, &current->payload[k]));

  827. 

  828.         if (!cbs_h2645_read_more_rbsp_data(rw))

  829.             break;

  830.     }

  831.     if (k >= H264_MAX_SEI_PAYLOADS) {

  832.         av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many payloads in "

  833.                "SEI message: found %d.\n", k);

  834.         return AVERROR_INVALIDDATA;

  835.     }

  836.     current->payload_count = k + 1;

  837. #else

  838.     for (k = 0; k < current->payload_count; k++) {

  839.         PutBitContext start_state;

  840.         uint32_t tmp;

  841.         int need_size, i;

  842. 

  843.         // Somewhat clumsy: we write the payload twice when

  844.         // we don't know the size in advance.  This will mess

  845.         // with trace output, but is otherwise harmless.

  846.         start_state = *rw;

  847.         need_size = !current->payload[k].payload_size;

  848.         for (i = 0; i < 1 + need_size; i++) {

  849.             *rw = start_state;

  850. 

  851.             tmp = current->payload[k].payload_type;

  852.             while (tmp >= 255) {

  853.                 fixed(8, ff_byte, 0xff);

  854.                 tmp -= 255;

  855.             }

  856.             xu(8, last_payload_type_byte, tmp, 0, 254, 0);

  857. 

  858.             tmp = current->payload[k].payload_size;

  859.             while (tmp >= 255) {

  860.                 fixed(8, ff_byte, 0xff);

  861.                 tmp -= 255;

  862.             }

  863.             xu(8, last_payload_size_byte, tmp, 0, 254, 0);

  864. 

  865.             CHECK(FUNC(sei_payload)(ctx, rw, &current->payload[k]));

  866.         }

  867.     }

  868. #endif

  869. 

  870.     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));

  871. 

  872.     return 0;

  873. }

  874. 

  875. static int FUNC(aud)(CodedBitstreamContext *ctx, RWContext *rw,

  876.                      H264RawAUD *current)

  877. {

  878.     int err;

  879. 

  880.     HEADER("Access Unit Delimiter");

  881. 

  882.     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,

  883.                                 1 << H264_NAL_AUD));

  884. 

  885.     u(3, primary_pic_type, 0, 7);

  886. 

  887.     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));

  888. 

  889.     return 0;

  890. }

  891. 

  892. static int FUNC(ref_pic_list_modification)(CodedBitstreamContext *ctx, RWContext *rw,

  893.                                            H264RawSliceHeader *current)

  894. {

  895.     CodedBitstreamH264Context *h264 = ctx->priv_data;

  896.     const H264RawSPS *sps = h264->active_sps;

  897.     int err, i, mopn;

  898. 

  899.     if (current->slice_type % 5 != 2 &&

  900.         current->slice_type % 5 != 4) {

  901.         flag(ref_pic_list_modification_flag_l0);

  902.         if (current->ref_pic_list_modification_flag_l0) {

  903.             for (i = 0; i < H264_MAX_RPLM_COUNT; i++) {

  904.                 xue(modification_of_pic_nums_idc,

  905.                     current->rplm_l0[i].modification_of_pic_nums_idc, 0, 3, 0);

  906. 

  907.                 mopn = current->rplm_l0[i].modification_of_pic_nums_idc;

  908.                 if (mopn == 3)

  909.                     break;

  910. 

  911.                 if (mopn == 0 || mopn == 1)

  912.                     xue(abs_diff_pic_num_minus1,

  913.                         current->rplm_l0[i].abs_diff_pic_num_minus1,

  914.                         0, (1 + current->field_pic_flag) *

  915.                         (1 << (sps->log2_max_frame_num_minus4 + 4)), 0);

  916.                 else if (mopn == 2)

  917.                     xue(long_term_pic_num,

  918.                         current->rplm_l0[i].long_term_pic_num,

  919.                         0, sps->max_num_ref_frames - 1, 0);

  920.             }

  921.         }

  922.     }

  923. 

  924.     if (current->slice_type % 5 == 1) {

  925.         flag(ref_pic_list_modification_flag_l1);

  926.         if (current->ref_pic_list_modification_flag_l1) {

  927.             for (i = 0; i < H264_MAX_RPLM_COUNT; i++) {

  928.                 xue(modification_of_pic_nums_idc,

  929.                     current->rplm_l1[i].modification_of_pic_nums_idc, 0, 3, 0);

  930. 

  931.                 mopn = current->rplm_l1[i].modification_of_pic_nums_idc;

  932.                 if (mopn == 3)

  933.                     break;

  934. 

  935.                 if (mopn == 0 || mopn == 1)

  936.                     xue(abs_diff_pic_num_minus1,

  937.                         current->rplm_l1[i].abs_diff_pic_num_minus1,

  938.                         0, (1 + current->field_pic_flag) *

  939.                         (1 << (sps->log2_max_frame_num_minus4 + 4)), 0);

  940.                 else if (mopn == 2)

  941.                     xue(long_term_pic_num,

  942.                         current->rplm_l1[i].long_term_pic_num,

  943.                         0, sps->max_num_ref_frames - 1, 0);

  944.             }

  945.         }

  946.     }

  947. 

  948.     return 0;

  949. }

  950. 

  951. static int FUNC(pred_weight_table)(CodedBitstreamContext *ctx, RWContext *rw,

  952.                                    H264RawSliceHeader *current)

  953. {

  954.     CodedBitstreamH264Context *h264 = ctx->priv_data;

  955.     const H264RawSPS *sps = h264->active_sps;

  956.     int chroma;

  957.     int err, i, j;

  958. 

  959.     ue(luma_log2_weight_denom, 0, 7);

  960. 

  961.     chroma = !sps->separate_colour_plane_flag && sps->chroma_format_idc != 0;

  962.     if (chroma)

  963.         ue(chroma_log2_weight_denom, 0, 7);

  964. 

  965.     for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {

  966.         flags(luma_weight_l0_flag[i], 1, i);

  967.         if (current->luma_weight_l0_flag[i]) {

  968.             ses(luma_weight_l0[i], -128, +127, 1, i);

  969.             ses(luma_offset_l0[i], -128, +127, 1, i);

  970.         }

  971.         if (chroma) {

  972.             flags(chroma_weight_l0_flag[i], 1, i);

  973.             if (current->chroma_weight_l0_flag[i]) {

  974.                 for (j = 0; j < 2; j++) {

  975.                     ses(chroma_weight_l0[i][j], -128, +127, 2, i, j);

  976.                     ses(chroma_offset_l0[i][j], -128, +127, 2, i, j);

  977.                 }

  978.             }

  979.         }

  980.     }

  981. 

  982.     if (current->slice_type % 5 == 1) {

  983.         for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {

  984.             flags(luma_weight_l1_flag[i], 1, i);

  985.             if (current->luma_weight_l1_flag[i]) {

  986.                 ses(luma_weight_l1[i], -128, +127, 1, i);

  987.                 ses(luma_offset_l1[i], -128, +127, 1, i);

  988.             }

  989.             if (chroma) {

  990.                 flags(chroma_weight_l1_flag[i], 1, i);

  991.                 if (current->chroma_weight_l1_flag[i]) {

  992.                     for (j = 0; j < 2; j++) {

  993.                         ses(chroma_weight_l1[i][j], -128, +127, 2, i, j);

  994.                         ses(chroma_offset_l1[i][j], -128, +127, 2, i, j);

  995.                     }

  996.                 }

  997.             }

  998.         }

  999.     }

  1000. 

  1001.     return 0;

  1002. }

  1003. 

  1004. static int FUNC(dec_ref_pic_marking)(CodedBitstreamContext *ctx, RWContext *rw,

  1005.                                      H264RawSliceHeader *current, int idr_pic_flag)

  1006. {

  1007.     CodedBitstreamH264Context *h264 = ctx->priv_data;

  1008.     const H264RawSPS *sps = h264->active_sps;

  1009.     int err, i;

  1010.     uint32_t mmco;

  1011. 

  1012.     if (idr_pic_flag) {

  1013.         flag(no_output_of_prior_pics_flag);

  1014.         flag(long_term_reference_flag);

  1015.     } else {

  1016.         flag(adaptive_ref_pic_marking_mode_flag);

  1017.         if (current->adaptive_ref_pic_marking_mode_flag) {

  1018.             for (i = 0; i < H264_MAX_MMCO_COUNT; i++) {

  1019.                 xue(memory_management_control_operation,

  1020.                     current->mmco[i].memory_management_control_operation,

  1021.                     0, 6, 0);

  1022. 

  1023.                 mmco = current->mmco[i].memory_management_control_operation;

  1024.                 if (mmco == 0)

  1025.                     break;

  1026. 

  1027.                 if (mmco == 1 || mmco == 3)

  1028.                     xue(difference_of_pic_nums_minus1,

  1029.                         current->mmco[i].difference_of_pic_nums_minus1,

  1030.                         0, INT32_MAX, 0);

  1031.                 if (mmco == 2)

  1032.                     xue(long_term_pic_num,

  1033.                         current->mmco[i].long_term_pic_num,

  1034.                         0, sps->max_num_ref_frames - 1, 0);

  1035.                 if (mmco == 3 || mmco == 6)

  1036.                     xue(long_term_frame_idx,

  1037.                         current->mmco[i].long_term_frame_idx,

  1038.                         0, sps->max_num_ref_frames - 1, 0);

  1039.                 if (mmco == 4)

  1040.                     xue(max_long_term_frame_idx_plus1,

  1041.                         current->mmco[i].max_long_term_frame_idx_plus1,

  1042.                         0, sps->max_num_ref_frames, 0);

  1043.             }

  1044.             if (i == H264_MAX_MMCO_COUNT) {

  1045.                 av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many "

  1046.                        "memory management control operations.\n");

  1047.                 return AVERROR_INVALIDDATA;

  1048.             }

  1049.         }

  1050.     }

  1051. 

  1052.     return 0;

  1053. }

  1054. 

  1055. static int FUNC(slice_header)(CodedBitstreamContext *ctx, RWContext *rw,

  1056.                               H264RawSliceHeader *current)

  1057. {

  1058.     CodedBitstreamH264Context *h264 = ctx->priv_data;

  1059.     const H264RawSPS *sps;

  1060.     const H264RawPPS *pps;

  1061.     int err;

  1062.     int idr_pic_flag;

  1063.     int slice_type_i, slice_type_p, slice_type_b;

  1064.     int slice_type_si, slice_type_sp;

  1065. 

  1066.     HEADER("Slice Header");

  1067. 

  1068.     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,

  1069.                                 1 << H264_NAL_SLICE     |

  1070.                                 1 << H264_NAL_IDR_SLICE |

  1071.                                 1 << H264_NAL_AUXILIARY_SLICE));

  1072. 

  1073.     if (current->nal_unit_header.nal_unit_type == H264_NAL_AUXILIARY_SLICE) {

  1074.         if (!h264->last_slice_nal_unit_type) {

  1075.             av_log(ctx->log_ctx, AV_LOG_ERROR, "Auxiliary slice "

  1076.                    "is not decodable without the main picture "

  1077.                    "in the same access unit.\n");

  1078.             return AVERROR_INVALIDDATA;

  1079.         }

  1080.     } else {

  1081.         h264->last_slice_nal_unit_type =

  1082.             current->nal_unit_header.nal_unit_type;

  1083.     }

  1084.     idr_pic_flag = h264->last_slice_nal_unit_type == H264_NAL_IDR_SLICE;

  1085. 

  1086.     ue(first_mb_in_slice, 0, H264_MAX_MB_PIC_SIZE - 1);

  1087.     ue(slice_type, 0, 9);

  1088. 

  1089.     slice_type_i  = current->slice_type % 5 == 2;

  1090.     slice_type_p  = current->slice_type % 5 == 0;

  1091.     slice_type_b  = current->slice_type % 5 == 1;

  1092.     slice_type_si = current->slice_type % 5 == 4;

  1093.     slice_type_sp = current->slice_type % 5 == 3;

  1094. 

  1095.     if (idr_pic_flag && !(slice_type_i || slice_type_si)) {

  1096.         av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid slice type %d "

  1097.                "for IDR picture.\n", current->slice_type);

  1098.         return AVERROR_INVALIDDATA;

  1099.     }

  1100. 

  1101.     ue(pic_parameter_set_id, 0, 255);

  1102. 

  1103.     pps = h264->pps[current->pic_parameter_set_id];

  1104.     if (!pps) {

  1105.         av_log(ctx->log_ctx, AV_LOG_ERROR, "PPS id %d not available.\n",

  1106.                current->pic_parameter_set_id);

  1107.         return AVERROR_INVALIDDATA;

  1108.     }

  1109.     h264->active_pps = pps;

  1110. 

  1111.     sps = h264->sps[pps->seq_parameter_set_id];

  1112.     if (!sps) {

  1113.         av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",

  1114.                pps->seq_parameter_set_id);

  1115.         return AVERROR_INVALIDDATA;

  1116.     }

  1117.     h264->active_sps = sps;

  1118. 

  1119.     if (sps->separate_colour_plane_flag)

  1120.         u(2, colour_plane_id, 0, 2);

  1121. 

  1122.     u(sps->log2_max_frame_num_minus4 + 4, frame_num,

  1123.       0, MAX_UINT_BITS(sps->log2_max_frame_num_minus4 + 4));

  1124. 

  1125.     if (!sps->frame_mbs_only_flag) {

  1126.         flag(field_pic_flag);

  1127.         if (current->field_pic_flag)

  1128.             flag(bottom_field_flag);

  1129.         else

  1130.             infer(bottom_field_flag, 0);

  1131.     } else {

  1132.         infer(field_pic_flag,    0);

  1133.         infer(bottom_field_flag, 0);

  1134.     }

  1135. 

  1136.     if (idr_pic_flag)

  1137.         ue(idr_pic_id, 0, 65535);

  1138. 

  1139.     if (sps->pic_order_cnt_type == 0) {

  1140.         u(sps->log2_max_pic_order_cnt_lsb_minus4 + 4, pic_order_cnt_lsb,

  1141.           0, MAX_UINT_BITS(sps->log2_max_pic_order_cnt_lsb_minus4 + 4));

  1142.         if (pps->bottom_field_pic_order_in_frame_present_flag &&

  1143.             !current->field_pic_flag)

  1144.             se(delta_pic_order_cnt_bottom, INT32_MIN + 1, INT32_MAX);

  1145. 

  1146.     } else if (sps->pic_order_cnt_type == 1) {

  1147.         if (!sps->delta_pic_order_always_zero_flag) {

  1148.             se(delta_pic_order_cnt[0], INT32_MIN + 1, INT32_MAX);

  1149.             if (pps->bottom_field_pic_order_in_frame_present_flag &&

  1150.                 !current->field_pic_flag)

  1151.                 se(delta_pic_order_cnt[1], INT32_MIN + 1, INT32_MAX);

  1152.             else

  1153.                 infer(delta_pic_order_cnt[1], 0);

  1154.         } else {

  1155.             infer(delta_pic_order_cnt[0], 0);

  1156.             infer(delta_pic_order_cnt[1], 0);

  1157.         }

  1158.     }

  1159. 

  1160.     if (pps->redundant_pic_cnt_present_flag)

  1161.         ue(redundant_pic_cnt, 0, 127);

  1162. 

  1163.     if (slice_type_b)

  1164.         flag(direct_spatial_mv_pred_flag);

  1165. 

  1166.     if (slice_type_p || slice_type_sp || slice_type_b) {

  1167.         flag(num_ref_idx_active_override_flag);

  1168.         if (current->num_ref_idx_active_override_flag) {

  1169.             ue(num_ref_idx_l0_active_minus1, 0, 31);

  1170.             if (slice_type_b)

  1171.                 ue(num_ref_idx_l1_active_minus1, 0, 31);

  1172.         } else {

  1173.             infer(num_ref_idx_l0_active_minus1,

  1174.                   pps->num_ref_idx_l0_default_active_minus1);

  1175.             infer(num_ref_idx_l1_active_minus1,

  1176.                   pps->num_ref_idx_l1_default_active_minus1);

  1177.         }

  1178.     }

  1179. 

  1180.     if (current->nal_unit_header.nal_unit_type == 20 ||

  1181.         current->nal_unit_header.nal_unit_type == 21) {

  1182.         av_log(ctx->log_ctx, AV_LOG_ERROR, "MVC / 3DAVC not supported.\n");

  1183.         return AVERROR_PATCHWELCOME;

  1184.     } else {

  1185.         CHECK(FUNC(ref_pic_list_modification)(ctx, rw, current));

  1186.     }

  1187. 

  1188.     if ((pps->weighted_pred_flag && (slice_type_p || slice_type_sp)) ||

  1189.         (pps->weighted_bipred_idc == 1 && slice_type_b)) {

  1190.         CHECK(FUNC(pred_weight_table)(ctx, rw, current));

  1191.     }

  1192. 

  1193.     if (current->nal_unit_header.nal_ref_idc != 0) {

  1194.         CHECK(FUNC(dec_ref_pic_marking)(ctx, rw, current, idr_pic_flag));

  1195.     }

  1196. 

  1197.     if (pps->entropy_coding_mode_flag &&

  1198.         !slice_type_i && !slice_type_si) {

  1199.         ue(cabac_init_idc, 0, 2);

  1200.     }

  1201. 

  1202.     se(slice_qp_delta, - 51 - 6 * sps->bit_depth_luma_minus8,

  1203.                        + 51 + 6 * sps->bit_depth_luma_minus8);

  1204.     if (slice_type_sp || slice_type_si) {

  1205.         if (slice_type_sp)

  1206.             flag(sp_for_switch_flag);

  1207.         se(slice_qs_delta, -51, +51);

  1208.     }

  1209. 

  1210.     if (pps->deblocking_filter_control_present_flag) {

  1211.         ue(disable_deblocking_filter_idc, 0, 2);

  1212.         if (current->disable_deblocking_filter_idc != 1) {

  1213.             se(slice_alpha_c0_offset_div2, -6, +6);

  1214.             se(slice_beta_offset_div2,     -6, +6);

  1215.         } else {

  1216.             infer(slice_alpha_c0_offset_div2, 0);

  1217.             infer(slice_beta_offset_div2,     0);

  1218.         }

  1219.     } else {

  1220.         infer(disable_deblocking_filter_idc, 0);

  1221.         infer(slice_alpha_c0_offset_div2,    0);

  1222.         infer(slice_beta_offset_div2,        0);

  1223.     }

  1224. 

  1225.     if (pps->num_slice_groups_minus1 > 0 &&

  1226.         pps->slice_group_map_type >= 3 &&

  1227.         pps->slice_group_map_type <= 5) {

  1228.         unsigned int pic_size, max, bits;

  1229. 

  1230.         pic_size = (sps->pic_width_in_mbs_minus1 + 1) *

  1231.                    (sps->pic_height_in_map_units_minus1 + 1);

  1232.         max = (pic_size + pps->slice_group_change_rate_minus1) /

  1233.               (pps->slice_group_change_rate_minus1 + 1);

  1234.         bits = av_log2(2 * max - 1);

  1235. 

  1236.         u(bits, slice_group_change_cycle, 0, max);

  1237.     }

  1238. 

  1239.     if (pps->entropy_coding_mode_flag) {

  1240.         while (byte_alignment(rw))

  1241.             fixed(1, cabac_alignment_one_bit, 1);

  1242.     }

  1243. 

  1244.     return 0;

  1245. }

  1246. 

  1247. static int FUNC(filler)(CodedBitstreamContext *ctx, RWContext *rw,

  1248.                         H264RawFiller *current)

  1249. {

  1250.     int err;

  1251. 

  1252.     HEADER("Filler Data");

  1253. 

  1254.     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,

  1255.                                 1 << H264_NAL_FILLER_DATA));

  1256. 

  1257. #ifdef READ

  1258.     while (show_bits(rw, 8) == 0xff) {

  1259.         fixed(8, ff_byte, 0xff);

  1260.         ++current->filler_size;

  1261.     }

  1262. #else

  1263.     {

  1264.         uint32_t i;

  1265.         for (i = 0; i < current->filler_size; i++)

  1266.             fixed(8, ff_byte, 0xff);

  1267.     }

  1268. #endif

  1269. 

  1270.     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));

  1271. 

  1272.     return 0;

  1273. }