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FFmpeg/libavcodec/h264_ps.c

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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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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" //FIXME FIXME FIXME (just for zigzag_scan)

  35. #include "golomb.h"

  36. 

  37. #define MAX_LOG2_MAX_FRAME_NUM    (12 + 4)

  38. #define MIN_LOG2_MAX_FRAME_NUM    4

  39. 

  40. static const AVRational pixel_aspect[17] = {

  41.     {   0,  1 },

  42.     {   1,  1 },

  43.     {  12, 11 },

  44.     {  10, 11 },

  45.     {  16, 11 },

  46.     {  40, 33 },

  47.     {  24, 11 },

  48.     {  20, 11 },

  49.     {  32, 11 },

  50.     {  80, 33 },

  51.     {  18, 11 },

  52.     {  15, 11 },

  53.     {  64, 33 },

  54.     { 160, 99 },

  55.     {   4,  3 },

  56.     {   3,  2 },

  57.     {   2,  1 },

  58. };

  59. 

  60. #define QP(qP, depth) ((qP) + 6 * ((depth) - 8))

  61. 

  62. #define CHROMA_QP_TABLE_END(d)                                          \

  63.     QP(0,  d), QP(1,  d), QP(2,  d), QP(3,  d), QP(4,  d), QP(5,  d),   \

  64.     QP(6,  d), QP(7,  d), QP(8,  d), QP(9,  d), QP(10, d), QP(11, d),   \

  65.     QP(12, d), QP(13, d), QP(14, d), QP(15, d), QP(16, d), QP(17, d),   \

  66.     QP(18, d), QP(19, d), QP(20, d), QP(21, d), QP(22, d), QP(23, d),   \

  67.     QP(24, d), QP(25, d), QP(26, d), QP(27, d), QP(28, d), QP(29, d),   \

  68.     QP(29, d), QP(30, d), QP(31, d), QP(32, d), QP(32, d), QP(33, d),   \

  69.     QP(34, d), QP(34, d), QP(35, d), QP(35, d), QP(36, d), QP(36, d),   \

  70.     QP(37, d), QP(37, d), QP(37, d), QP(38, d), QP(38, d), QP(38, d),   \

  71.     QP(39, d), QP(39, d), QP(39, d), QP(39, d)

  72. 

  73. const uint8_t ff_h264_chroma_qp[3][QP_MAX_NUM + 1] = {

  74.     { CHROMA_QP_TABLE_END(8) },

  75.     { 0, 1, 2, 3, 4, 5,

  76.       CHROMA_QP_TABLE_END(9) },

  77.     { 0, 1, 2, 3, 4, 5,

  78.       6, 7, 8, 9, 10, 11,

  79.       CHROMA_QP_TABLE_END(10) },

  80. };

  81. 

  82. static const uint8_t default_scaling4[2][16] = {

  83.     {  6, 13, 20, 28, 13, 20, 28, 32,

  84.       20, 28, 32, 37, 28, 32, 37, 42 },

  85.     { 10, 14, 20, 24, 14, 20, 24, 27,

  86.       20, 24, 27, 30, 24, 27, 30, 34 }

  87. };

  88. 

  89. static const uint8_t default_scaling8[2][64] = {

  90.     {  6, 10, 13, 16, 18, 23, 25, 27,

  91.       10, 11, 16, 18, 23, 25, 27, 29,

  92.       13, 16, 18, 23, 25, 27, 29, 31,

  93.       16, 18, 23, 25, 27, 29, 31, 33,

  94.       18, 23, 25, 27, 29, 31, 33, 36,

  95.       23, 25, 27, 29, 31, 33, 36, 38,

  96.       25, 27, 29, 31, 33, 36, 38, 40,

  97.       27, 29, 31, 33, 36, 38, 40, 42 },

  98.     {  9, 13, 15, 17, 19, 21, 22, 24,

  99.       13, 13, 17, 19, 21, 22, 24, 25,

  100.       15, 17, 19, 21, 22, 24, 25, 27,

  101.       17, 19, 21, 22, 24, 25, 27, 28,

  102.       19, 21, 22, 24, 25, 27, 28, 30,

  103.       21, 22, 24, 25, 27, 28, 30, 32,

  104.       22, 24, 25, 27, 28, 30, 32, 33,

  105.       24, 25, 27, 28, 30, 32, 33, 35 }

  106. };

  107. 

  108. static inline int decode_hrd_parameters(H264Context *h, SPS *sps)

  109. {

  110.     int cpb_count, i;

  111.     cpb_count = get_ue_golomb_31(&h->gb) + 1;

  112. 

  113.     if (cpb_count > 32U) {

  114.         av_log(h->avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);

  115.         return AVERROR_INVALIDDATA;

  116.     }

  117. 

  118.     get_bits(&h->gb, 4); /* bit_rate_scale */

  119.     get_bits(&h->gb, 4); /* cpb_size_scale */

  120.     for (i = 0; i < cpb_count; i++) {

  121.         get_ue_golomb_long(&h->gb); /* bit_rate_value_minus1 */

  122.         get_ue_golomb_long(&h->gb); /* cpb_size_value_minus1 */

  123.         get_bits1(&h->gb);          /* cbr_flag */

  124.     }

  125.     sps->initial_cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;

  126.     sps->cpb_removal_delay_length         = get_bits(&h->gb, 5) + 1;

  127.     sps->dpb_output_delay_length          = get_bits(&h->gb, 5) + 1;

  128.     sps->time_offset_length               = get_bits(&h->gb, 5);

  129.     sps->cpb_cnt                          = cpb_count;

  130.     return 0;

  131. }

  132. 

  133. static inline int decode_vui_parameters(H264Context *h, SPS *sps)

  134. {

  135.     int aspect_ratio_info_present_flag;

  136.     unsigned int aspect_ratio_idc;

  137. 

  138.     aspect_ratio_info_present_flag = get_bits1(&h->gb);

  139. 

  140.     if (aspect_ratio_info_present_flag) {

  141.         aspect_ratio_idc = get_bits(&h->gb, 8);

  142.         if (aspect_ratio_idc == EXTENDED_SAR) {

  143.             sps->sar.num = get_bits(&h->gb, 16);

  144.             sps->sar.den = get_bits(&h->gb, 16);

  145.         } else if (aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)) {

  146.             sps->sar = pixel_aspect[aspect_ratio_idc];

  147.         } else {

  148.             av_log(h->avctx, AV_LOG_ERROR, "illegal aspect ratio\n");

  149.             return AVERROR_INVALIDDATA;

  150.         }

  151.     } else {

  152.         sps->sar.num =

  153.         sps->sar.den = 0;

  154.     }

  155. 

  156.     if (get_bits1(&h->gb))      /* overscan_info_present_flag */

  157.         get_bits1(&h->gb);      /* overscan_appropriate_flag */

  158. 

  159.     sps->video_signal_type_present_flag = get_bits1(&h->gb);

  160.     if (sps->video_signal_type_present_flag) {

  161.         get_bits(&h->gb, 3);                 /* video_format */

  162.         sps->full_range = get_bits1(&h->gb); /* video_full_range_flag */

  163. 

  164.         sps->colour_description_present_flag = get_bits1(&h->gb);

  165.         if (sps->colour_description_present_flag) {

  166.             sps->color_primaries = get_bits(&h->gb, 8); /* colour_primaries */

  167.             sps->color_trc       = get_bits(&h->gb, 8); /* transfer_characteristics */

  168.             sps->colorspace      = get_bits(&h->gb, 8); /* matrix_coefficients */

  169.             if (sps->color_primaries >= AVCOL_PRI_NB)

  170.                 sps->color_primaries = AVCOL_PRI_UNSPECIFIED;

  171.             if (sps->color_trc >= AVCOL_TRC_NB)

  172.                 sps->color_trc = AVCOL_TRC_UNSPECIFIED;

  173.             if (sps->colorspace >= AVCOL_SPC_NB)

  174.                 sps->colorspace = AVCOL_SPC_UNSPECIFIED;

  175.         }

  176.     }

  177. 

  178.     /* chroma_location_info_present_flag */

  179.     if (get_bits1(&h->gb)) {

  180.         /* chroma_sample_location_type_top_field */

  181.         h->avctx->chroma_sample_location = get_ue_golomb(&h->gb) + 1;

  182.         get_ue_golomb(&h->gb);  /* chroma_sample_location_type_bottom_field */

  183.     }

  184. 

  185.     sps->timing_info_present_flag = get_bits1(&h->gb);

  186.     if (sps->timing_info_present_flag) {

  187.         sps->num_units_in_tick = get_bits_long(&h->gb, 32);

  188.         sps->time_scale        = get_bits_long(&h->gb, 32);

  189.         if (!sps->num_units_in_tick || !sps->time_scale) {

  190.             av_log(h->avctx, AV_LOG_ERROR,

  191.                    "time_scale/num_units_in_tick invalid or unsupported (%"PRIu32"/%"PRIu32")\n",

  192.                    sps->time_scale, sps->num_units_in_tick);

  193.             return AVERROR_INVALIDDATA;

  194.         }

  195.         sps->fixed_frame_rate_flag = get_bits1(&h->gb);

  196.     }

  197. 

  198.     sps->nal_hrd_parameters_present_flag = get_bits1(&h->gb);

  199.     if (sps->nal_hrd_parameters_present_flag)

  200.         if (decode_hrd_parameters(h, sps) < 0)

  201.             return AVERROR_INVALIDDATA;

  202.     sps->vcl_hrd_parameters_present_flag = get_bits1(&h->gb);

  203.     if (sps->vcl_hrd_parameters_present_flag)

  204.         if (decode_hrd_parameters(h, sps) < 0)

  205.             return AVERROR_INVALIDDATA;

  206.     if (sps->nal_hrd_parameters_present_flag ||

  207.         sps->vcl_hrd_parameters_present_flag)

  208.         get_bits1(&h->gb);     /* low_delay_hrd_flag */

  209.     sps->pic_struct_present_flag = get_bits1(&h->gb);

  210. 

  211.     sps->bitstream_restriction_flag = get_bits1(&h->gb);

  212.     if (sps->bitstream_restriction_flag) {

  213.         get_bits1(&h->gb);     /* motion_vectors_over_pic_boundaries_flag */

  214.         get_ue_golomb(&h->gb); /* max_bytes_per_pic_denom */

  215.         get_ue_golomb(&h->gb); /* max_bits_per_mb_denom */

  216.         get_ue_golomb(&h->gb); /* log2_max_mv_length_horizontal */

  217.         get_ue_golomb(&h->gb); /* log2_max_mv_length_vertical */

  218.         sps->num_reorder_frames = get_ue_golomb(&h->gb);

  219.         get_ue_golomb(&h->gb); /*max_dec_frame_buffering*/

  220. 

  221.         if (get_bits_left(&h->gb) < 0) {

  222.             sps->num_reorder_frames         = 0;

  223.             sps->bitstream_restriction_flag = 0;

  224.         }

  225. 

  226.         if (sps->num_reorder_frames > 16U

  227.             /* max_dec_frame_buffering || max_dec_frame_buffering > 16 */) {

  228.             av_log(h->avctx, AV_LOG_ERROR,

  229.                    "Clipping illegal num_reorder_frames %d\n",

  230.                    sps->num_reorder_frames);

  231.             sps->num_reorder_frames = 16;

  232.             return AVERROR_INVALIDDATA;

  233.         }

  234.     }

  235.     if (get_bits_left(&h->gb) < 0) {

  236.         av_log(h->avctx, AV_LOG_ERROR,

  237.                "Overread VUI by %d bits\n", -get_bits_left(&h->gb));

  238.         return AVERROR_INVALIDDATA;

  239.     }

  240. 

  241.     return 0;

  242. }

  243. 

  244. static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,

  245.                                 const uint8_t *jvt_list,

  246.                                 const uint8_t *fallback_list)

  247. {

  248.     int i, last = 8, next = 8;

  249.     const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;

  250.     if (!get_bits1(&h->gb)) /* matrix not written, we use the predicted one */

  251.         memcpy(factors, fallback_list, size * sizeof(uint8_t));

  252.     else

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

  254.             if (next)

  255.                 next = (last + get_se_golomb(&h->gb)) & 0xff;

  256.             if (!i && !next) { /* matrix not written, we use the preset one */

  257.                 memcpy(factors, jvt_list, size * sizeof(uint8_t));

  258.                 break;

  259.             }

  260.             last = factors[scan[i]] = next ? next : last;

  261.         }

  262. }

  263. 

  264. static void decode_scaling_matrices(H264Context *h, SPS *sps,

  265.                                     PPS *pps, int is_sps,

  266.                                     uint8_t(*scaling_matrix4)[16],

  267.                                     uint8_t(*scaling_matrix8)[64])

  268. {

  269.     int fallback_sps = !is_sps && sps->scaling_matrix_present;

  270.     const uint8_t *fallback[4] = {

  271.         fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],

  272.         fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],

  273.         fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],

  274.         fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]

  275.     };

  276.     if (get_bits1(&h->gb)) {

  277.         sps->scaling_matrix_present |= is_sps;

  278.         decode_scaling_list(h, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]);        // Intra, Y

  279.         decode_scaling_list(h, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr

  280.         decode_scaling_list(h, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb

  281.         decode_scaling_list(h, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]);        // Inter, Y

  282.         decode_scaling_list(h, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr

  283.         decode_scaling_list(h, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb

  284.         if (is_sps || pps->transform_8x8_mode) {

  285.             decode_scaling_list(h, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y

  286.             if (sps->chroma_format_idc == 3) {

  287.                 decode_scaling_list(h, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr

  288.                 decode_scaling_list(h, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb

  289.             }

  290.             decode_scaling_list(h, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y

  291.             if (sps->chroma_format_idc == 3) {

  292.                 decode_scaling_list(h, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr

  293.                 decode_scaling_list(h, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb

  294.             }

  295.         }

  296.     }

  297. }

  298. 

  299. int ff_h264_decode_seq_parameter_set(H264Context *h)

  300. {

  301.     int profile_idc, level_idc, constraint_set_flags = 0;

  302.     unsigned int sps_id;

  303.     int i, log2_max_frame_num_minus4;

  304.     SPS *sps;

  305. 

  306.     profile_idc           = get_bits(&h->gb, 8);

  307.     constraint_set_flags |= get_bits1(&h->gb) << 0;   // constraint_set0_flag

  308.     constraint_set_flags |= get_bits1(&h->gb) << 1;   // constraint_set1_flag

  309.     constraint_set_flags |= get_bits1(&h->gb) << 2;   // constraint_set2_flag

  310.     constraint_set_flags |= get_bits1(&h->gb) << 3;   // constraint_set3_flag

  311.     constraint_set_flags |= get_bits1(&h->gb) << 4;   // constraint_set4_flag

  312.     constraint_set_flags |= get_bits1(&h->gb) << 5;   // constraint_set5_flag

  313.     skip_bits(&h->gb, 2);                             // reserved_zero_2bits

  314.     level_idc = get_bits(&h->gb, 8);

  315.     sps_id    = get_ue_golomb_31(&h->gb);

  316. 

  317.     if (sps_id >= MAX_SPS_COUNT) {

  318.         av_log(h->avctx, AV_LOG_ERROR, "sps_id %u out of range\n", sps_id);

  319.         return AVERROR_INVALIDDATA;

  320.     }

  321.     sps = av_mallocz(sizeof(SPS));

  322.     if (!sps)

  323.         return AVERROR(ENOMEM);

  324. 

  325.     sps->sps_id               = sps_id;

  326.     sps->time_offset_length   = 24;

  327.     sps->profile_idc          = profile_idc;

  328.     sps->constraint_set_flags = constraint_set_flags;

  329.     sps->level_idc            = level_idc;

  330. 

  331.     memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));

  332.     memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));

  333.     sps->scaling_matrix_present = 0;

  334. 

  335.     if (sps->profile_idc == 100 ||  // High profile

  336.         sps->profile_idc == 110 ||  // High10 profile

  337.         sps->profile_idc == 122 ||  // High422 profile

  338.         sps->profile_idc == 244 ||  // High444 Predictive profile

  339.         sps->profile_idc ==  44 ||  // Cavlc444 profile

  340.         sps->profile_idc ==  83 ||  // Scalable Constrained High profile (SVC)

  341.         sps->profile_idc ==  86 ||  // Scalable High Intra profile (SVC)

  342.         sps->profile_idc == 118 ||  // Stereo High profile (MVC)

  343.         sps->profile_idc == 128 ||  // Multiview High profile (MVC)

  344.         sps->profile_idc == 138 ||  // Multiview Depth High profile (MVCD)

  345.         sps->profile_idc == 144) {  // old High444 profile

  346.         sps->chroma_format_idc = get_ue_golomb_31(&h->gb);

  347.         if (sps->chroma_format_idc > 3) {

  348.             avpriv_request_sample(h->avctx, "chroma_format_idc %u",

  349.                                   sps->chroma_format_idc);

  350.             goto fail;

  351.         } else if (sps->chroma_format_idc == 3) {

  352.             sps->residual_color_transform_flag = get_bits1(&h->gb);

  353.         }

  354.         sps->bit_depth_luma   = get_ue_golomb(&h->gb) + 8;

  355.         sps->bit_depth_chroma = get_ue_golomb(&h->gb) + 8;

  356.         if (sps->bit_depth_chroma != sps->bit_depth_luma) {

  357.             avpriv_request_sample(h->avctx,

  358.                                   "Different chroma and luma bit depth");

  359.             goto fail;

  360.         }

  361.         sps->transform_bypass = get_bits1(&h->gb);

  362.         decode_scaling_matrices(h, sps, NULL, 1,

  363.                                 sps->scaling_matrix4, sps->scaling_matrix8);

  364.     } else {

  365.         sps->chroma_format_idc = 1;

  366.         sps->bit_depth_luma    = 8;

  367.         sps->bit_depth_chroma  = 8;

  368.     }

  369. 

  370.     log2_max_frame_num_minus4 = get_ue_golomb(&h->gb);

  371.     if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||

  372.         log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {

  373.         av_log(h->avctx, AV_LOG_ERROR,

  374.                "log2_max_frame_num_minus4 out of range (0-12): %d\n",

  375.                log2_max_frame_num_minus4);

  376.         goto fail;

  377.     }

  378.     sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;

  379. 

  380.     sps->poc_type = get_ue_golomb_31(&h->gb);

  381. 

  382.     if (sps->poc_type == 0) { // FIXME #define

  383.         sps->log2_max_poc_lsb = get_ue_golomb(&h->gb) + 4;

  384.     } else if (sps->poc_type == 1) { // FIXME #define

  385.         sps->delta_pic_order_always_zero_flag = get_bits1(&h->gb);

  386.         sps->offset_for_non_ref_pic           = get_se_golomb(&h->gb);

  387.         sps->offset_for_top_to_bottom_field   = get_se_golomb(&h->gb);

  388.         sps->poc_cycle_length                 = get_ue_golomb(&h->gb);

  389. 

  390.         if ((unsigned)sps->poc_cycle_length >=

  391.             FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {

  392.             av_log(h->avctx, AV_LOG_ERROR,

  393.                    "poc_cycle_length overflow %d\n", sps->poc_cycle_length);

  394.             goto fail;

  395.         }

  396. 

  397.         for (i = 0; i < sps->poc_cycle_length; i++)

  398.             sps->offset_for_ref_frame[i] = get_se_golomb(&h->gb);

  399.     } else if (sps->poc_type != 2) {

  400.         av_log(h->avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);

  401.         goto fail;

  402.     }

  403. 

  404.     sps->ref_frame_count = get_ue_golomb_31(&h->gb);

  405.     if (sps->ref_frame_count > H264_MAX_PICTURE_COUNT - 2 ||

  406.         sps->ref_frame_count >= 32U) {

  407.         av_log(h->avctx, AV_LOG_ERROR,

  408.                "too many reference frames %d\n", sps->ref_frame_count);

  409.         goto fail;

  410.     }

  411.     sps->gaps_in_frame_num_allowed_flag = get_bits1(&h->gb);

  412.     sps->mb_width                       = get_ue_golomb(&h->gb) + 1;

  413.     sps->mb_height                      = get_ue_golomb(&h->gb) + 1;

  414.     if ((unsigned)sps->mb_width  >= INT_MAX / 16 ||

  415.         (unsigned)sps->mb_height >= INT_MAX / 16 ||

  416.         av_image_check_size(16 * sps->mb_width,

  417.                             16 * sps->mb_height, 0, h->avctx)) {

  418.         av_log(h->avctx, AV_LOG_ERROR, "mb_width/height overflow\n");

  419.         goto fail;

  420.     }

  421. 

  422.     sps->frame_mbs_only_flag = get_bits1(&h->gb);

  423.     if (!sps->frame_mbs_only_flag)

  424.         sps->mb_aff = get_bits1(&h->gb);

  425.     else

  426.         sps->mb_aff = 0;

  427. 

  428.     sps->direct_8x8_inference_flag = get_bits1(&h->gb);

  429.     if (!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag) {

  430.         av_log(h->avctx, AV_LOG_ERROR,

  431.                "This stream was generated by a broken encoder, invalid 8x8 inference\n");

  432.         goto fail;

  433.     }

  434. 

  435. #ifndef ALLOW_INTERLACE

  436.     if (sps->mb_aff)

  437.         av_log(h->avctx, AV_LOG_ERROR,

  438.                "MBAFF support not included; enable it at compile-time.\n");

  439. #endif

  440.     sps->crop = get_bits1(&h->gb);

  441.     if (sps->crop) {

  442.         int crop_left   = get_ue_golomb(&h->gb);

  443.         int crop_right  = get_ue_golomb(&h->gb);

  444.         int crop_top    = get_ue_golomb(&h->gb);

  445.         int crop_bottom = get_ue_golomb(&h->gb);

  446. 

  447.         if (h->avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) {

  448.             av_log(h->avctx, AV_LOG_DEBUG, "discarding sps cropping, original "

  449.                                            "values are l:%d r:%d t:%d b:%d\n",

  450.                    crop_left, crop_right, crop_top, crop_bottom);

  451. 

  452.             sps->crop_left   =

  453.             sps->crop_right  =

  454.             sps->crop_top    =

  455.             sps->crop_bottom = 0;

  456.         } else {

  457.             int vsub   = (sps->chroma_format_idc == 1) ? 1 : 0;

  458.             int hsub   = (sps->chroma_format_idc == 1 ||

  459.                           sps->chroma_format_idc == 2) ? 1 : 0;

  460.             int step_x = 1 << hsub;

  461.             int step_y = (2 - sps->frame_mbs_only_flag) << vsub;

  462. 

  463.             if (crop_left & (0x1F >> (sps->bit_depth_luma > 8)) &&

  464.                 !(h->avctx->flags & CODEC_FLAG_UNALIGNED)) {

  465.                 crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));

  466.                 av_log(h->avctx, AV_LOG_WARNING,

  467.                        "Reducing left cropping to %d "

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

  469.                        crop_left);

  470.             }

  471. 

  472.             sps->crop_left   = crop_left   * step_x;

  473.             sps->crop_right  = crop_right  * step_x;

  474.             sps->crop_top    = crop_top    * step_y;

  475.             sps->crop_bottom = crop_bottom * step_y;

  476.         }

  477.     } else {

  478.         sps->crop_left   =

  479.         sps->crop_right  =

  480.         sps->crop_top    =

  481.         sps->crop_bottom =

  482.         sps->crop        = 0;

  483.     }

  484. 

  485.     sps->vui_parameters_present_flag = get_bits1(&h->gb);

  486.     if (sps->vui_parameters_present_flag) {

  487.         int ret = decode_vui_parameters(h, sps);

  488.         if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)

  489.             goto fail;

  490.     }

  491. 

  492.     if (!sps->sar.den)

  493.         sps->sar.den = 1;

  494. 

  495.     if (h->avctx->debug & FF_DEBUG_PICT_INFO) {

  496.         static const char csp[4][5] = { "Gray", "420", "422", "444" };

  497.         av_log(h->avctx, AV_LOG_DEBUG,

  498.                "sps:%u profile:%d/%d poc:%d ref:%d %dx%d %s %s crop:%u/%u/%u/%u %s %s %"PRId32"/%"PRId32"\n",

  499.                sps_id, sps->profile_idc, sps->level_idc,

  500.                sps->poc_type,

  501.                sps->ref_frame_count,

  502.                sps->mb_width, sps->mb_height,

  503.                sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),

  504.                sps->direct_8x8_inference_flag ? "8B8" : "",

  505.                sps->crop_left, sps->crop_right,

  506.                sps->crop_top, sps->crop_bottom,

  507.                sps->vui_parameters_present_flag ? "VUI" : "",

  508.                csp[sps->chroma_format_idc],

  509.                sps->timing_info_present_flag ? sps->num_units_in_tick : 0,

  510.                sps->timing_info_present_flag ? sps->time_scale : 0);

  511.     }

  512.     sps->new = 1;

  513. 

  514.     av_free(h->sps_buffers[sps_id]);

  515.     h->sps_buffers[sps_id] = sps;

  516.     h->sps                 = *sps;

  517. 

  518.     return 0;

  519. 

  520. fail:

  521.     av_free(sps);

  522.     return -1;

  523. }

  524. 

  525. static void build_qp_table(PPS *pps, int t, int index, const int depth)

  526. {

  527.     int i;

  528.     const int max_qp = 51 + 6 * (depth - 8);

  529.     for (i = 0; i < max_qp + 1; i++)

  530.         pps->chroma_qp_table[t][i] =

  531.             ff_h264_chroma_qp[depth - 8][av_clip(i + index, 0, max_qp)];

  532. }

  533. 

  534. int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)

  535. {

  536.     unsigned int pps_id = get_ue_golomb(&h->gb);

  537.     PPS *pps;

  538.     const int qp_bd_offset = 6 * (h->sps.bit_depth_luma - 8);

  539.     int bits_left;

  540. 

  541.     if (pps_id >= MAX_PPS_COUNT) {

  542.         av_log(h->avctx, AV_LOG_ERROR, "pps_id %u out of range\n", pps_id);

  543.         return AVERROR_INVALIDDATA;

  544.     } else if (h->sps.bit_depth_luma > 10) {

  545.         av_log(h->avctx, AV_LOG_ERROR,

  546.                "Unimplemented luma bit depth=%d (max=10)\n",

  547.                h->sps.bit_depth_luma);

  548.         return AVERROR_PATCHWELCOME;

  549.     }

  550. 

  551.     pps = av_mallocz(sizeof(PPS));

  552.     if (!pps)

  553.         return AVERROR(ENOMEM);

  554.     pps->sps_id = get_ue_golomb_31(&h->gb);

  555.     if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||

  556.         h->sps_buffers[pps->sps_id] == NULL) {

  557.         av_log(h->avctx, AV_LOG_ERROR, "sps_id %u out of range\n", pps->sps_id);

  558.         goto fail;

  559.     }

  560. 

  561.     pps->cabac             = get_bits1(&h->gb);

  562.     pps->pic_order_present = get_bits1(&h->gb);

  563.     pps->slice_group_count = get_ue_golomb(&h->gb) + 1;

  564.     if (pps->slice_group_count > 1) {

  565.         pps->mb_slice_group_map_type = get_ue_golomb(&h->gb);

  566.         av_log(h->avctx, AV_LOG_ERROR, "FMO not supported\n");

  567.         switch (pps->mb_slice_group_map_type) {

  568.         case 0:

  569. #if 0

  570.     |       for (i = 0; i <= num_slice_groups_minus1; i++)  |   |      |

  571.     |           run_length[i]                               |1  |ue(v) |

  572. #endif

  573.             break;

  574.         case 2:

  575. #if 0

  576.     |       for (i = 0; i < num_slice_groups_minus1; i++) { |   |      |

  577.     |           top_left_mb[i]                              |1  |ue(v) |

  578.     |           bottom_right_mb[i]                          |1  |ue(v) |

  579.     |       }                                               |   |      |

  580. #endif

  581.             break;

  582.         case 3:

  583.         case 4:

  584.         case 5:

  585. #if 0

  586.     |       slice_group_change_direction_flag               |1  |u(1)  |

  587.     |       slice_group_change_rate_minus1                  |1  |ue(v) |

  588. #endif

  589.             break;

  590.         case 6:

  591. #if 0

  592.     |       slice_group_id_cnt_minus1                       |1  |ue(v) |

  593.     |       for (i = 0; i <= slice_group_id_cnt_minus1; i++)|   |      |

  594.     |           slice_group_id[i]                           |1  |u(v)  |

  595. #endif

  596.             break;

  597.         }

  598.     }

  599.     pps->ref_count[0] = get_ue_golomb(&h->gb) + 1;

  600.     pps->ref_count[1] = get_ue_golomb(&h->gb) + 1;

  601.     if (pps->ref_count[0] - 1 > 32 - 1 || pps->ref_count[1] - 1 > 32 - 1) {

  602.         av_log(h->avctx, AV_LOG_ERROR, "reference overflow (pps)\n");

  603.         goto fail;

  604.     }

  605. 

  606.     pps->weighted_pred                        = get_bits1(&h->gb);

  607.     pps->weighted_bipred_idc                  = get_bits(&h->gb, 2);

  608.     pps->init_qp                              = get_se_golomb(&h->gb) + 26 + qp_bd_offset;

  609.     pps->init_qs                              = get_se_golomb(&h->gb) + 26 + qp_bd_offset;

  610.     pps->chroma_qp_index_offset[0]            = get_se_golomb(&h->gb);

  611.     pps->deblocking_filter_parameters_present = get_bits1(&h->gb);

  612.     pps->constrained_intra_pred               = get_bits1(&h->gb);

  613.     pps->redundant_pic_cnt_present            = get_bits1(&h->gb);

  614. 

  615.     pps->transform_8x8_mode = 0;

  616.     // contents of sps/pps can change even if id doesn't, so reinit

  617.     h->dequant_coeff_pps = -1;

  618.     memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4,

  619.            sizeof(pps->scaling_matrix4));

  620.     memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8,

  621.            sizeof(pps->scaling_matrix8));

  622. 

  623.     bits_left = bit_length - get_bits_count(&h->gb);

  624.     if (bits_left && (bits_left > 8 ||

  625.                       show_bits(&h->gb, bits_left) != 1 << (bits_left - 1))) {

  626.         pps->transform_8x8_mode = get_bits1(&h->gb);

  627.         decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0,

  628.                                 pps->scaling_matrix4, pps->scaling_matrix8);

  629.         // second_chroma_qp_index_offset

  630.         pps->chroma_qp_index_offset[1] = get_se_golomb(&h->gb);

  631.     } else {

  632.         pps->chroma_qp_index_offset[1] = pps->chroma_qp_index_offset[0];

  633.     }

  634. 

  635.     build_qp_table(pps, 0, pps->chroma_qp_index_offset[0],

  636.                    h->sps.bit_depth_luma);

  637.     build_qp_table(pps, 1, pps->chroma_qp_index_offset[1],

  638.                    h->sps.bit_depth_luma);

  639.     if (pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])

  640.         pps->chroma_qp_diff = 1;

  641. 

  642.     if (h->avctx->debug & FF_DEBUG_PICT_INFO) {

  643.         av_log(h->avctx, AV_LOG_DEBUG,

  644.                "pps:%u sps:%u %s slice_groups:%d ref:%u/%u %s qp:%d/%d/%d/%d %s %s %s %s\n",

  645.                pps_id, pps->sps_id,

  646.                pps->cabac ? "CABAC" : "CAVLC",

  647.                pps->slice_group_count,

  648.                pps->ref_count[0], pps->ref_count[1],

  649.                pps->weighted_pred ? "weighted" : "",

  650.                pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],

  651.                pps->deblocking_filter_parameters_present ? "LPAR" : "",

  652.                pps->constrained_intra_pred ? "CONSTR" : "",

  653.                pps->redundant_pic_cnt_present ? "REDU" : "",

  654.                pps->transform_8x8_mode ? "8x8DCT" : "");

  655.     }

  656. 

  657.     av_free(h->pps_buffers[pps_id]);

  658.     h->pps_buffers[pps_id] = pps;

  659.     return 0;

  660. 

  661. fail:

  662.     av_free(pps);

  663.     return -1;

  664. }