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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 "mathops.h"

  33. #include "avcodec.h"

  34. #include "h264.h"

  35. #include "h264data.h"

  36. #include "golomb.h"

  37. 

  38. #define MAX_LOG2_MAX_FRAME_NUM    (12 + 4)

  39. #define MIN_LOG2_MAX_FRAME_NUM    4

  40. 

  41. static const AVRational pixel_aspect[17] = {

  42.     {   0,  1 },

  43.     {   1,  1 },

  44.     {  12, 11 },

  45.     {  10, 11 },

  46.     {  16, 11 },

  47.     {  40, 33 },

  48.     {  24, 11 },

  49.     {  20, 11 },

  50.     {  32, 11 },

  51.     {  80, 33 },

  52.     {  18, 11 },

  53.     {  15, 11 },

  54.     {  64, 33 },

  55.     { 160, 99 },

  56.     {   4,  3 },

  57.     {   3,  2 },

  58.     {   2,  1 },

  59. };

  60. 

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

  62.     {  6, 13, 20, 28, 13, 20, 28, 32,

  63.       20, 28, 32, 37, 28, 32, 37, 42 },

  64.     { 10, 14, 20, 24, 14, 20, 24, 27,

  65.       20, 24, 27, 30, 24, 27, 30, 34 }

  66. };

  67. 

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

  69.     {  6, 10, 13, 16, 18, 23, 25, 27,

  70.       10, 11, 16, 18, 23, 25, 27, 29,

  71.       13, 16, 18, 23, 25, 27, 29, 31,

  72.       16, 18, 23, 25, 27, 29, 31, 33,

  73.       18, 23, 25, 27, 29, 31, 33, 36,

  74.       23, 25, 27, 29, 31, 33, 36, 38,

  75.       25, 27, 29, 31, 33, 36, 38, 40,

  76.       27, 29, 31, 33, 36, 38, 40, 42 },

  77.     {  9, 13, 15, 17, 19, 21, 22, 24,

  78.       13, 13, 17, 19, 21, 22, 24, 25,

  79.       15, 17, 19, 21, 22, 24, 25, 27,

  80.       17, 19, 21, 22, 24, 25, 27, 28,

  81.       19, 21, 22, 24, 25, 27, 28, 30,

  82.       21, 22, 24, 25, 27, 28, 30, 32,

  83.       22, 24, 25, 27, 28, 30, 32, 33,

  84.       24, 25, 27, 28, 30, 32, 33, 35 }

  85. };

  86. 

  87. /* maximum number of MBs in the DPB for a given level */

  88. static const int level_max_dpb_mbs[][2] = {

  89.     { 10, 396       },

  90.     { 11, 900       },

  91.     { 12, 2376      },

  92.     { 13, 2376      },

  93.     { 20, 2376      },

  94.     { 21, 4752      },

  95.     { 22, 8100      },

  96.     { 30, 8100      },

  97.     { 31, 18000     },

  98.     { 32, 20480     },

  99.     { 40, 32768     },

  100.     { 41, 32768     },

  101.     { 42, 34816     },

  102.     { 50, 110400    },

  103.     { 51, 184320    },

  104.     { 52, 184320    },

  105. };

  106. 

  107. static void remove_pps(H264ParamSets *s, int id)

  108. {

  109.     if (s->pps_list[id] && s->pps == (const PPS*)s->pps_list[id]->data)

  110.         s->pps = NULL;

  111.     av_buffer_unref(&s->pps_list[id]);

  112. }

  113. 

  114. static void remove_sps(H264ParamSets *s, int id)

  115. {

  116.     int i;

  117.     if (s->sps_list[id]) {

  118.         if (s->sps == (SPS*)s->sps_list[id]->data)

  119.             s->sps = NULL;

  120. 

  121.         /* drop all PPS that depend on this SPS */

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

  123.             if (s->pps_list[i] && ((PPS*)s->pps_list[i]->data)->sps_id == id)

  124.                 remove_pps(s, i);

  125.     }

  126.     av_buffer_unref(&s->sps_list[id]);

  127. }

  128. 

  129. static inline int decode_hrd_parameters(GetBitContext *gb, AVCodecContext *avctx,

  130.                                         SPS *sps)

  131. {

  132.     int cpb_count, i;

  133.     cpb_count = get_ue_golomb_31(gb) + 1;

  134. 

  135.     if (cpb_count > 32U) {

  136.         av_log(avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);

  137.         return AVERROR_INVALIDDATA;

  138.     }

  139. 

  140.     get_bits(gb, 4); /* bit_rate_scale */

  141.     get_bits(gb, 4); /* cpb_size_scale */

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

  143.         get_ue_golomb_long(gb); /* bit_rate_value_minus1 */

  144.         get_ue_golomb_long(gb); /* cpb_size_value_minus1 */

  145.         get_bits1(gb);          /* cbr_flag */

  146.     }

  147.     sps->initial_cpb_removal_delay_length = get_bits(gb, 5) + 1;

  148.     sps->cpb_removal_delay_length         = get_bits(gb, 5) + 1;

  149.     sps->dpb_output_delay_length          = get_bits(gb, 5) + 1;

  150.     sps->time_offset_length               = get_bits(gb, 5);

  151.     sps->cpb_cnt                          = cpb_count;

  152.     return 0;

  153. }

  154. 

  155. static inline int decode_vui_parameters(GetBitContext *gb, AVCodecContext *avctx,

  156.                                         SPS *sps)

  157. {

  158.     int aspect_ratio_info_present_flag;

  159.     unsigned int aspect_ratio_idc;

  160. 

  161.     aspect_ratio_info_present_flag = get_bits1(gb);

  162. 

  163.     if (aspect_ratio_info_present_flag) {

  164.         aspect_ratio_idc = get_bits(gb, 8);

  165.         if (aspect_ratio_idc == EXTENDED_SAR) {

  166.             sps->sar.num = get_bits(gb, 16);

  167.             sps->sar.den = get_bits(gb, 16);

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

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

  170.         } else {

  171.             av_log(avctx, AV_LOG_ERROR, "illegal aspect ratio\n");

  172.             return AVERROR_INVALIDDATA;

  173.         }

  174.     } else {

  175.         sps->sar.num =

  176.         sps->sar.den = 0;

  177.     }

  178. 

  179.     if (get_bits1(gb))      /* overscan_info_present_flag */

  180.         get_bits1(gb);      /* overscan_appropriate_flag */

  181. 

  182.     sps->video_signal_type_present_flag = get_bits1(gb);

  183.     if (sps->video_signal_type_present_flag) {

  184.         get_bits(gb, 3);                 /* video_format */

  185.         sps->full_range = get_bits1(gb); /* video_full_range_flag */

  186. 

  187.         sps->colour_description_present_flag = get_bits1(gb);

  188.         if (sps->colour_description_present_flag) {

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

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

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

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

  193.                 sps->color_primaries = AVCOL_PRI_UNSPECIFIED;

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

  195.                 sps->color_trc = AVCOL_TRC_UNSPECIFIED;

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

  197.                 sps->colorspace = AVCOL_SPC_UNSPECIFIED;

  198.         }

  199.     }

  200. 

  201.     /* chroma_location_info_present_flag */

  202.     if (get_bits1(gb)) {

  203.         /* chroma_sample_location_type_top_field */

  204.         avctx->chroma_sample_location = get_ue_golomb(gb) + 1;

  205.         get_ue_golomb(gb);  /* chroma_sample_location_type_bottom_field */

  206.     }

  207. 

  208.     sps->timing_info_present_flag = get_bits1(gb);

  209.     if (sps->timing_info_present_flag) {

  210.         sps->num_units_in_tick = get_bits_long(gb, 32);

  211.         sps->time_scale        = get_bits_long(gb, 32);

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

  213.             av_log(avctx, AV_LOG_ERROR,

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

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

  216.             return AVERROR_INVALIDDATA;

  217.         }

  218.         sps->fixed_frame_rate_flag = get_bits1(gb);

  219.     }

  220. 

  221.     sps->nal_hrd_parameters_present_flag = get_bits1(gb);

  222.     if (sps->nal_hrd_parameters_present_flag)

  223.         if (decode_hrd_parameters(gb, avctx, sps) < 0)

  224.             return AVERROR_INVALIDDATA;

  225.     sps->vcl_hrd_parameters_present_flag = get_bits1(gb);

  226.     if (sps->vcl_hrd_parameters_present_flag)

  227.         if (decode_hrd_parameters(gb, avctx, sps) < 0)

  228.             return AVERROR_INVALIDDATA;

  229.     if (sps->nal_hrd_parameters_present_flag ||

  230.         sps->vcl_hrd_parameters_present_flag)

  231.         get_bits1(gb);     /* low_delay_hrd_flag */

  232.     sps->pic_struct_present_flag = get_bits1(gb);

  233. 

  234.     sps->bitstream_restriction_flag = get_bits1(gb);

  235.     if (sps->bitstream_restriction_flag) {

  236.         get_bits1(gb);     /* motion_vectors_over_pic_boundaries_flag */

  237.         get_ue_golomb(gb); /* max_bytes_per_pic_denom */

  238.         get_ue_golomb(gb); /* max_bits_per_mb_denom */

  239.         get_ue_golomb(gb); /* log2_max_mv_length_horizontal */

  240.         get_ue_golomb(gb); /* log2_max_mv_length_vertical */

  241.         sps->num_reorder_frames = get_ue_golomb(gb);

  242.         get_ue_golomb(gb); /*max_dec_frame_buffering*/

  243. 

  244.         if (get_bits_left(gb) < 0) {

  245.             sps->num_reorder_frames         = 0;

  246.             sps->bitstream_restriction_flag = 0;

  247.         }

  248. 

  249.         if (sps->num_reorder_frames > 16U

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

  251.             av_log(avctx, AV_LOG_ERROR,

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

  253.                    sps->num_reorder_frames);

  254.             sps->num_reorder_frames = 16;

  255.             return AVERROR_INVALIDDATA;

  256.         }

  257.     }

  258.     if (get_bits_left(gb) < 0) {

  259.         av_log(avctx, AV_LOG_ERROR,

  260.                "Overread VUI by %d bits\n", -get_bits_left(gb));

  261.         return AVERROR_INVALIDDATA;

  262.     }

  263. 

  264.     return 0;

  265. }

  266. 

  267. static void decode_scaling_list(GetBitContext *gb, uint8_t *factors, int size,

  268.                                 const uint8_t *jvt_list,

  269.                                 const uint8_t *fallback_list)

  270. {

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

  272.     const uint8_t *scan = size == 16 ? ff_zigzag_scan : ff_zigzag_direct;

  273.     if (!get_bits1(gb)) /* matrix not written, we use the predicted one */

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

  275.     else

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

  277.             if (next)

  278.                 next = (last + get_se_golomb(gb)) & 0xff;

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

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

  281.                 break;

  282.             }

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

  284.         }

  285. }

  286. 

  287. static void decode_scaling_matrices(GetBitContext *gb, SPS *sps,

  288.                                     PPS *pps, int is_sps,

  289.                                     uint8_t(*scaling_matrix4)[16],

  290.                                     uint8_t(*scaling_matrix8)[64])

  291. {

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

  293.     const uint8_t *fallback[4] = {

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

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

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

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

  298.     };

  299.     if (get_bits1(gb)) {

  300.         sps->scaling_matrix_present |= is_sps;

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

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

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

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

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

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

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

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

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

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

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

  312.             }

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

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

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

  316.                 decode_scaling_list(gb, 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(GetBitContext *gb, AVCodecContext *avctx,

  323.                                      H264ParamSets *ps)

  324. {

  325.     AVBufferRef *sps_buf;

  326.     int profile_idc, level_idc, constraint_set_flags = 0;

  327.     unsigned int sps_id;

  328.     int i, log2_max_frame_num_minus4;

  329.     SPS *sps;

  330. 

  331.     profile_idc           = get_bits(gb, 8);

  332.     constraint_set_flags |= get_bits1(gb) << 0;   // constraint_set0_flag

  333.     constraint_set_flags |= get_bits1(gb) << 1;   // constraint_set1_flag

  334.     constraint_set_flags |= get_bits1(gb) << 2;   // constraint_set2_flag

  335.     constraint_set_flags |= get_bits1(gb) << 3;   // constraint_set3_flag

  336.     constraint_set_flags |= get_bits1(gb) << 4;   // constraint_set4_flag

  337.     constraint_set_flags |= get_bits1(gb) << 5;   // constraint_set5_flag

  338.     skip_bits(gb, 2);                             // reserved_zero_2bits

  339.     level_idc = get_bits(gb, 8);

  340.     sps_id    = get_ue_golomb_31(gb);

  341. 

  342.     if (sps_id >= MAX_SPS_COUNT) {

  343.         av_log(avctx, AV_LOG_ERROR, "sps_id %u out of range\n", sps_id);

  344.         return AVERROR_INVALIDDATA;

  345.     }

  346. 

  347.     sps_buf = av_buffer_allocz(sizeof(*sps));

  348.     if (!sps_buf)

  349.         return AVERROR(ENOMEM);

  350.     sps = (SPS*)sps_buf->data;

  351. 

  352.     sps->sps_id               = sps_id;

  353.     sps->time_offset_length   = 24;

  354.     sps->profile_idc          = profile_idc;

  355.     sps->constraint_set_flags = constraint_set_flags;

  356.     sps->level_idc            = level_idc;

  357. 

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

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

  360.     sps->scaling_matrix_present = 0;

  361. 

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

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

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

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

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

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

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

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

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

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

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

  373.         sps->chroma_format_idc = get_ue_golomb_31(gb);

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

  375.             avpriv_request_sample(avctx, "chroma_format_idc %u",

  376.                                   sps->chroma_format_idc);

  377.             goto fail;

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

  379.             sps->residual_color_transform_flag = get_bits1(gb);

  380.         }

  381.         sps->bit_depth_luma   = get_ue_golomb(gb) + 8;

  382.         sps->bit_depth_chroma = get_ue_golomb(gb) + 8;

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

  384.             avpriv_request_sample(avctx,

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

  386.             goto fail;

  387.         }

  388.         sps->transform_bypass = get_bits1(gb);

  389.         decode_scaling_matrices(gb, sps, NULL, 1,

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

  391.     } else {

  392.         sps->chroma_format_idc = 1;

  393.         sps->bit_depth_luma    = 8;

  394.         sps->bit_depth_chroma  = 8;

  395.     }

  396. 

  397.     log2_max_frame_num_minus4 = get_ue_golomb(gb);

  398.     if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||

  399.         log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {

  400.         av_log(avctx, AV_LOG_ERROR,

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

  402.                log2_max_frame_num_minus4);

  403.         goto fail;

  404.     }

  405.     sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;

  406. 

  407.     sps->poc_type = get_ue_golomb_31(gb);

  408. 

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

  410.         sps->log2_max_poc_lsb = get_ue_golomb(gb) + 4;

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

  412.         sps->delta_pic_order_always_zero_flag = get_bits1(gb);

  413.         sps->offset_for_non_ref_pic           = get_se_golomb(gb);

  414.         sps->offset_for_top_to_bottom_field   = get_se_golomb(gb);

  415.         sps->poc_cycle_length                 = get_ue_golomb(gb);

  416. 

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

  418.             FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {

  419.             av_log(avctx, AV_LOG_ERROR,

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

  421.             goto fail;

  422.         }

  423. 

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

  425.             sps->offset_for_ref_frame[i] = get_se_golomb(gb);

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

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

  428.         goto fail;

  429.     }

  430. 

  431.     sps->ref_frame_count = get_ue_golomb_31(gb);

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

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

  434.         av_log(avctx, AV_LOG_ERROR,

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

  436.         goto fail;

  437.     }

  438.     sps->gaps_in_frame_num_allowed_flag = get_bits1(gb);

  439.     sps->mb_width                       = get_ue_golomb(gb) + 1;

  440.     sps->mb_height                      = get_ue_golomb(gb) + 1;

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

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

  443.         av_image_check_size(16 * sps->mb_width,

  444.                             16 * sps->mb_height, 0, avctx)) {

  445.         av_log(avctx, AV_LOG_ERROR, "mb_width/height overflow\n");

  446.         goto fail;

  447.     }

  448. 

  449.     sps->frame_mbs_only_flag = get_bits1(gb);

  450.     if (!sps->frame_mbs_only_flag)

  451.         sps->mb_aff = get_bits1(gb);

  452.     else

  453.         sps->mb_aff = 0;

  454. 

  455.     sps->direct_8x8_inference_flag = get_bits1(gb);

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

  457.         av_log(avctx, AV_LOG_ERROR,

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

  459.         goto fail;

  460.     }

  461. 

  462. #ifndef ALLOW_INTERLACE

  463.     if (sps->mb_aff)

  464.         av_log(avctx, AV_LOG_ERROR,

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

  466. #endif

  467.     sps->crop = get_bits1(gb);

  468.     if (sps->crop) {

  469.         unsigned int crop_left   = get_ue_golomb(gb);

  470.         unsigned int crop_right  = get_ue_golomb(gb);

  471.         unsigned int crop_top    = get_ue_golomb(gb);

  472.         unsigned int crop_bottom = get_ue_golomb(gb);

  473. 

  474.         if (avctx->flags2 & AV_CODEC_FLAG2_IGNORE_CROP) {

  475.             av_log(avctx, AV_LOG_DEBUG, "discarding sps cropping, original "

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

  477.                    crop_left, crop_right, crop_top, crop_bottom);

  478. 

  479.             sps->crop_left   =

  480.             sps->crop_right  =

  481.             sps->crop_top    =

  482.             sps->crop_bottom = 0;

  483.         } else {

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

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

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

  487.             int step_x = 1 << hsub;

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

  489. 

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

  491.                 !(avctx->flags & AV_CODEC_FLAG_UNALIGNED)) {

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

  493.                 av_log(avctx, AV_LOG_WARNING,

  494.                        "Reducing left cropping to %d "

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

  496.                        crop_left);

  497.             }

  498. 

  499.             if (INT_MAX / step_x             <= crop_left               ||

  500.                 INT_MAX / step_x - crop_left <= crop_right              ||

  501.                 16 * sps->mb_width <= step_x * (crop_left + crop_right) ||

  502.                 INT_MAX / step_y             <= crop_top                ||

  503.                 INT_MAX / step_y - crop_top  <= crop_bottom             ||

  504.                 16 * sps->mb_height <= step_y * (crop_top + crop_bottom)) {

  505.                 av_log(avctx, AV_LOG_WARNING, "Invalid crop parameters\n");

  506.                 if (avctx->err_recognition & AV_EF_EXPLODE)

  507.                     goto fail;

  508.                 crop_left = crop_right = crop_top = crop_bottom = 0;

  509.             }

  510. 

  511.             sps->crop_left   = crop_left   * step_x;

  512.             sps->crop_right  = crop_right  * step_x;

  513.             sps->crop_top    = crop_top    * step_y;

  514.             sps->crop_bottom = crop_bottom * step_y;

  515.         }

  516.     } else {

  517.         sps->crop_left   =

  518.         sps->crop_right  =

  519.         sps->crop_top    =

  520.         sps->crop_bottom =

  521.         sps->crop        = 0;

  522.     }

  523. 

  524.     sps->vui_parameters_present_flag = get_bits1(gb);

  525.     if (sps->vui_parameters_present_flag) {

  526.         int ret = decode_vui_parameters(gb, avctx, sps);

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

  528.             goto fail;

  529.     }

  530. 

  531.     /* if the maximum delay is not stored in the SPS, derive it based on the

  532.      * level */

  533.     if (!sps->bitstream_restriction_flag) {

  534.         sps->num_reorder_frames = MAX_DELAYED_PIC_COUNT - 1;

  535.         for (i = 0; i < FF_ARRAY_ELEMS(level_max_dpb_mbs); i++) {

  536.             if (level_max_dpb_mbs[i][0] == sps->level_idc) {

  537.                 sps->num_reorder_frames = FFMIN(level_max_dpb_mbs[i][1] / (sps->mb_width * sps->mb_height),

  538.                                                 sps->num_reorder_frames);

  539.                 break;

  540.             }

  541.         }

  542.     }

  543. 

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

  545.         sps->sar.den = 1;

  546. 

  547.     if (avctx->debug & FF_DEBUG_PICT_INFO) {

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

  549.         av_log(avctx, AV_LOG_DEBUG,

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

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

  552.                sps->poc_type,

  553.                sps->ref_frame_count,

  554.                sps->mb_width, sps->mb_height,

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

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

  557.                sps->crop_left, sps->crop_right,

  558.                sps->crop_top, sps->crop_bottom,

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

  560.                csp[sps->chroma_format_idc],

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

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

  563.     }

  564. 

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

  566.      * original one.

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

  568.     if (ps->sps_list[sps_id] &&

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

  570.         av_buffer_unref(&sps_buf);

  571.     } else {

  572.         remove_sps(ps, sps_id);

  573.         ps->sps_list[sps_id] = sps_buf;

  574.     }

  575. 

  576.     return 0;

  577. 

  578. fail:

  579.     av_buffer_unref(&sps_buf);

  580.     return AVERROR_INVALIDDATA;

  581. }

  582. 

  583. static void init_dequant8_coeff_table(PPS *pps, const SPS *sps)

  584. {

  585.     int i, j, q, x;

  586.     const int max_qp = 51 + 6 * (sps->bit_depth_luma - 8);

  587. 

  588.     for (i = 0; i < 6; i++) {

  589.         pps->dequant8_coeff[i] = pps->dequant8_buffer[i];

  590.         for (j = 0; j < i; j++)

  591.             if (!memcmp(pps->scaling_matrix8[j], pps->scaling_matrix8[i],

  592.                         64 * sizeof(uint8_t))) {

  593.                 pps->dequant8_coeff[i] = pps->dequant8_buffer[j];

  594.                 break;

  595.             }

  596.         if (j < i)

  597.             continue;

  598. 

  599.         for (q = 0; q < max_qp + 1; q++) {

  600.             int shift = ff_h264_quant_div6[q];

  601.             int idx   = ff_h264_quant_rem6[q];

  602.             for (x = 0; x < 64; x++)

  603.                 pps->dequant8_coeff[i][q][(x >> 3) | ((x & 7) << 3)] =

  604.                     ((uint32_t)ff_h264_dequant8_coeff_init[idx][ff_h264_dequant8_coeff_init_scan[((x >> 1) & 12) | (x & 3)]] *

  605.                      pps->scaling_matrix8[i][x]) << shift;

  606.         }

  607.     }

  608. }

  609. 

  610. static void init_dequant4_coeff_table(PPS *pps, const SPS *sps)

  611. {

  612.     int i, j, q, x;

  613.     const int max_qp = 51 + 6 * (sps->bit_depth_luma - 8);

  614.     for (i = 0; i < 6; i++) {

  615.         pps->dequant4_coeff[i] = pps->dequant4_buffer[i];

  616.         for (j = 0; j < i; j++)

  617.             if (!memcmp(pps->scaling_matrix4[j], pps->scaling_matrix4[i],

  618.                         16 * sizeof(uint8_t))) {

  619.                 pps->dequant4_coeff[i] = pps->dequant4_buffer[j];

  620.                 break;

  621.             }

  622.         if (j < i)

  623.             continue;

  624. 

  625.         for (q = 0; q < max_qp + 1; q++) {

  626.             int shift = ff_h264_quant_div6[q] + 2;

  627.             int idx   = ff_h264_quant_rem6[q];

  628.             for (x = 0; x < 16; x++)

  629.                 pps->dequant4_coeff[i][q][(x >> 2) | ((x << 2) & 0xF)] =

  630.                     ((uint32_t)ff_h264_dequant4_coeff_init[idx][(x & 1) + ((x >> 2) & 1)] *

  631.                      pps->scaling_matrix4[i][x]) << shift;

  632.         }

  633.     }

  634. }

  635. 

  636. static void init_dequant_tables(PPS *pps, const SPS *sps)

  637. {

  638.     int i, x;

  639.     init_dequant4_coeff_table(pps, sps);

  640.     if (pps->transform_8x8_mode)

  641.         init_dequant8_coeff_table(pps, sps);

  642.     if (sps->transform_bypass) {

  643.         for (i = 0; i < 6; i++)

  644.             for (x = 0; x < 16; x++)

  645.                 pps->dequant4_coeff[i][0][x] = 1 << 6;

  646.         if (pps->transform_8x8_mode)

  647.             for (i = 0; i < 6; i++)

  648.                 for (x = 0; x < 64; x++)

  649.                     pps->dequant8_coeff[i][0][x] = 1 << 6;

  650.     }

  651. }

  652. 

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

  654. {

  655.     int i;

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

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

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

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

  660. }

  661. 

  662. int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx,

  663.                                          H264ParamSets *ps, int bit_length)

  664. {

  665.     AVBufferRef *pps_buf;

  666.     SPS *sps;

  667.     unsigned int pps_id = get_ue_golomb(gb);

  668.     PPS *pps;

  669.     int qp_bd_offset;

  670.     int bits_left;

  671.     int ret;

  672. 

  673.     if (pps_id >= MAX_PPS_COUNT) {

  674.         av_log(avctx, AV_LOG_ERROR, "pps_id %u out of range\n", pps_id);

  675.         return AVERROR_INVALIDDATA;

  676.     }

  677. 

  678.     pps_buf = av_buffer_allocz(sizeof(*pps));

  679.     if (!pps_buf)

  680.         return AVERROR(ENOMEM);

  681.     pps = (PPS*)pps_buf->data;

  682. 

  683.     pps->sps_id = get_ue_golomb_31(gb);

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

  685.         !ps->sps_list[pps->sps_id]) {

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

  687.         ret = AVERROR_INVALIDDATA;

  688.         goto fail;

  689.     }

  690.     sps = (SPS*)ps->sps_list[pps->sps_id]->data;

  691. 

  692.     if (sps->bit_depth_luma > 10) {

  693.         av_log(avctx, AV_LOG_ERROR,

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

  695.                sps->bit_depth_luma);

  696.         ret = AVERROR_PATCHWELCOME;

  697.         goto fail;

  698.     }

  699. 

  700.     pps->cabac             = get_bits1(gb);

  701.     pps->pic_order_present = get_bits1(gb);

  702.     pps->slice_group_count = get_ue_golomb(gb) + 1;

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

  704.         pps->mb_slice_group_map_type = get_ue_golomb(gb);

  705.         av_log(avctx, AV_LOG_ERROR, "FMO not supported\n");

  706.         switch (pps->mb_slice_group_map_type) {

  707.         case 0:

  708. #if 0

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

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

  711. #endif

  712.             break;

  713.         case 2:

  714. #if 0

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

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

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

  718.     |       }                                               |   |      |

  719. #endif

  720.             break;

  721.         case 3:

  722.         case 4:

  723.         case 5:

  724. #if 0

  725.     |       slice_group_change_direction_flag               |1  |u(1)  |

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

  727. #endif

  728.             break;

  729.         case 6:

  730. #if 0

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

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

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

  734. #endif

  735.             break;

  736.         }

  737.     }

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

  739.     pps->ref_count[1] = get_ue_golomb(gb) + 1;

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

  741.         av_log(avctx, AV_LOG_ERROR, "reference overflow (pps)\n");

  742.         ret = AVERROR_INVALIDDATA;

  743.         goto fail;

  744.     }

  745. 

  746.     qp_bd_offset = 6 * (sps->bit_depth_luma - 8);

  747. 

  748.     pps->weighted_pred                        = get_bits1(gb);

  749.     pps->weighted_bipred_idc                  = get_bits(gb, 2);

  750.     pps->init_qp                              = get_se_golomb(gb) + 26 + qp_bd_offset;

  751.     pps->init_qs                              = get_se_golomb(gb) + 26 + qp_bd_offset;

  752.     pps->chroma_qp_index_offset[0]            = get_se_golomb(gb);

  753.     pps->deblocking_filter_parameters_present = get_bits1(gb);

  754.     pps->constrained_intra_pred               = get_bits1(gb);

  755.     pps->redundant_pic_cnt_present            = get_bits1(gb);

  756. 

  757.     pps->transform_8x8_mode = 0;

  758.     memcpy(pps->scaling_matrix4, sps->scaling_matrix4,

  759.            sizeof(pps->scaling_matrix4));

  760.     memcpy(pps->scaling_matrix8, sps->scaling_matrix8,

  761.            sizeof(pps->scaling_matrix8));

  762. 

  763.     bits_left = bit_length - get_bits_count(gb);

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

  765.                       show_bits(gb, bits_left) != 1 << (bits_left - 1))) {

  766.         pps->transform_8x8_mode = get_bits1(gb);

  767.         decode_scaling_matrices(gb, sps, pps, 0,

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

  769.         // second_chroma_qp_index_offset

  770.         pps->chroma_qp_index_offset[1] = get_se_golomb(gb);

  771.     } else {

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

  773.     }

  774. 

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

  776.                    sps->bit_depth_luma);

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

  778.                    sps->bit_depth_luma);

  779. 

  780.     init_dequant_tables(pps, sps);

  781. 

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

  783.         pps->chroma_qp_diff = 1;

  784. 

  785.     if (avctx->debug & FF_DEBUG_PICT_INFO) {

  786.         av_log(avctx, AV_LOG_DEBUG,

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

  788.                pps_id, pps->sps_id,

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

  790.                pps->slice_group_count,

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

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

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

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

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

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

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

  798.     }

  799. 

  800.     remove_pps(ps, pps_id);

  801.     ps->pps_list[pps_id] = pps_buf;

  802. 

  803.     return 0;

  804. 

  805. fail:

  806.     av_buffer_unref(&pps_buf);

  807.     return ret;

  808. }