falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
43415 Commits
32 Branches
824MB
Tree: 82b7525173
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '82b7525173'
${ noResults }
FFmpeg/libavcodec/h264_ps.c

811 lines
30KB
Raw Blame History 

  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 / MPEG-4 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 "h264data.h"

  35. #include "h264_ps.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. #define EXTENDED_SAR       255

  42. 

  43. static const AVRational pixel_aspect[17] = {

  44.     {   0,  1 },

  45.     {   1,  1 },

  46.     {  12, 11 },

  47.     {  10, 11 },

  48.     {  16, 11 },

  49.     {  40, 33 },

  50.     {  24, 11 },

  51.     {  20, 11 },

  52.     {  32, 11 },

  53.     {  80, 33 },

  54.     {  18, 11 },

  55.     {  15, 11 },

  56.     {  64, 33 },

  57.     { 160, 99 },

  58.     {   4,  3 },

  59.     {   3,  2 },

  60.     {   2,  1 },

  61. };

  62. 

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

  64.     {  6, 13, 20, 28, 13, 20, 28, 32,

  65.       20, 28, 32, 37, 28, 32, 37, 42 },

  66.     { 10, 14, 20, 24, 14, 20, 24, 27,

  67.       20, 24, 27, 30, 24, 27, 30, 34 }

  68. };

  69. 

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

  71.     {  6, 10, 13, 16, 18, 23, 25, 27,

  72.       10, 11, 16, 18, 23, 25, 27, 29,

  73.       13, 16, 18, 23, 25, 27, 29, 31,

  74.       16, 18, 23, 25, 27, 29, 31, 33,

  75.       18, 23, 25, 27, 29, 31, 33, 36,

  76.       23, 25, 27, 29, 31, 33, 36, 38,

  77.       25, 27, 29, 31, 33, 36, 38, 40,

  78.       27, 29, 31, 33, 36, 38, 40, 42 },

  79.     {  9, 13, 15, 17, 19, 21, 22, 24,

  80.       13, 13, 17, 19, 21, 22, 24, 25,

  81.       15, 17, 19, 21, 22, 24, 25, 27,

  82.       17, 19, 21, 22, 24, 25, 27, 28,

  83.       19, 21, 22, 24, 25, 27, 28, 30,

  84.       21, 22, 24, 25, 27, 28, 30, 32,

  85.       22, 24, 25, 27, 28, 30, 32, 33,

  86.       24, 25, 27, 28, 30, 32, 33, 35 }

  87. };

  88. 

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

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

  91.     { 10, 396       },

  92.     { 11, 900       },

  93.     { 12, 2376      },

  94.     { 13, 2376      },

  95.     { 20, 2376      },

  96.     { 21, 4752      },

  97.     { 22, 8100      },

  98.     { 30, 8100      },

  99.     { 31, 18000     },

  100.     { 32, 20480     },

  101.     { 40, 32768     },

  102.     { 41, 32768     },

  103.     { 42, 34816     },

  104.     { 50, 110400    },

  105.     { 51, 184320    },

  106.     { 52, 184320    },

  107. };

  108. 

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

  110. {

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

  112.         s->pps = NULL;

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

  114. }

  115. 

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

  117. {

  118.     int i;

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

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

  121.             s->sps = NULL;

  122. 

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

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

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

  126.                 remove_pps(s, i);

  127.     }

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

  129. }

  130. 

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

  132.                                         SPS *sps)

  133. {

  134.     int cpb_count, i;

  135.     cpb_count = get_ue_golomb_31(gb) + 1;

  136. 

  137.     if (cpb_count > 32U) {

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

  139.         return AVERROR_INVALIDDATA;

  140.     }

  141. 

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

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

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

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

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

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

  148.     }

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

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

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

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

  153.     sps->cpb_cnt                          = cpb_count;

  154.     return 0;

  155. }

  156. 

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

  158.                                         SPS *sps)

  159. {

  160.     int aspect_ratio_info_present_flag;

  161.     unsigned int aspect_ratio_idc;

  162. 

  163.     aspect_ratio_info_present_flag = get_bits1(gb);

  164. 

  165.     if (aspect_ratio_info_present_flag) {

  166.         aspect_ratio_idc = get_bits(gb, 8);

  167.         if (aspect_ratio_idc == EXTENDED_SAR) {

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

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

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

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

  172.         } else {

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

  174.             return AVERROR_INVALIDDATA;

  175.         }

  176.     } else {

  177.         sps->sar.num =

  178.         sps->sar.den = 0;

  179.     }

  180. 

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

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

  183. 

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

  185.     if (sps->video_signal_type_present_flag) {

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

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

  188. 

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

  190.         if (sps->colour_description_present_flag) {

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

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

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

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

  195.                 sps->color_primaries = AVCOL_PRI_UNSPECIFIED;

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

  197.                 sps->color_trc = AVCOL_TRC_UNSPECIFIED;

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

  199.                 sps->colorspace = AVCOL_SPC_UNSPECIFIED;

  200.         }

  201.     }

  202. 

  203.     /* chroma_location_info_present_flag */

  204.     if (get_bits1(gb)) {

  205.         /* chroma_sample_location_type_top_field */

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

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

  208.     }

  209. 

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

  211.     if (sps->timing_info_present_flag) {

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

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

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

  215.             av_log(avctx, AV_LOG_ERROR,

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

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

  218.             return AVERROR_INVALIDDATA;

  219.         }

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

  221.     }

  222. 

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

  224.     if (sps->nal_hrd_parameters_present_flag)

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

  226.             return AVERROR_INVALIDDATA;

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

  228.     if (sps->vcl_hrd_parameters_present_flag)

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

  230.             return AVERROR_INVALIDDATA;

  231.     if (sps->nal_hrd_parameters_present_flag ||

  232.         sps->vcl_hrd_parameters_present_flag)

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

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

  235. 

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

  237.     if (sps->bitstream_restriction_flag) {

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

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

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

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

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

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

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

  245. 

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

  247.             sps->num_reorder_frames         = 0;

  248.             sps->bitstream_restriction_flag = 0;

  249.         }

  250. 

  251.         if (sps->num_reorder_frames > 16U

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

  253.             av_log(avctx, AV_LOG_ERROR,

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

  255.                    sps->num_reorder_frames);

  256.             sps->num_reorder_frames = 16;

  257.             return AVERROR_INVALIDDATA;

  258.         }

  259.     }

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

  261.         av_log(avctx, AV_LOG_ERROR,

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

  263.         return AVERROR_INVALIDDATA;

  264.     }

  265. 

  266.     return 0;

  267. }

  268. 

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

  270.                                 const uint8_t *jvt_list,

  271.                                 const uint8_t *fallback_list)

  272. {

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

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

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

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

  277.     else

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

  279.             if (next)

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

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

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

  283.                 break;

  284.             }

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

  286.         }

  287. }

  288. 

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

  290.                                     PPS *pps, int is_sps,

  291.                                     uint8_t(*scaling_matrix4)[16],

  292.                                     uint8_t(*scaling_matrix8)[64])

  293. {

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

  295.     const uint8_t *fallback[4] = {

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

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

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

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

  300.     };

  301.     if (get_bits1(gb)) {

  302.         sps->scaling_matrix_present |= is_sps;

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

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

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

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

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

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

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

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

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

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

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

  314.             }

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

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

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

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

  319.             }

  320.         }

  321.     }

  322. }

  323. 

  324. int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,

  325.                                      H264ParamSets *ps)

  326. {

  327.     AVBufferRef *sps_buf;

  328.     int profile_idc, level_idc, constraint_set_flags = 0;

  329.     unsigned int sps_id;

  330.     int i, log2_max_frame_num_minus4;

  331.     SPS *sps;

  332. 

  333.     profile_idc           = get_bits(gb, 8);

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

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

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

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

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

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

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

  341.     level_idc = get_bits(gb, 8);

  342.     sps_id    = get_ue_golomb_31(gb);

  343. 

  344.     if (sps_id >= MAX_SPS_COUNT) {

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

  346.         return AVERROR_INVALIDDATA;

  347.     }

  348. 

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

  350.     if (!sps_buf)

  351.         return AVERROR(ENOMEM);

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

  353. 

  354.     sps->sps_id               = sps_id;

  355.     sps->time_offset_length   = 24;

  356.     sps->profile_idc          = profile_idc;

  357.     sps->constraint_set_flags = constraint_set_flags;

  358.     sps->level_idc            = level_idc;

  359. 

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

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

  362.     sps->scaling_matrix_present = 0;

  363. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  378.                                   sps->chroma_format_idc);

  379.             goto fail;

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

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

  382.         }

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

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

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

  386.             avpriv_request_sample(avctx,

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

  388.             goto fail;

  389.         }

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

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

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

  393.     } else {

  394.         sps->chroma_format_idc = 1;

  395.         sps->bit_depth_luma    = 8;

  396.         sps->bit_depth_chroma  = 8;

  397.     }

  398. 

  399.     log2_max_frame_num_minus4 = get_ue_golomb(gb);

  400.     if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||

  401.         log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {

  402.         av_log(avctx, AV_LOG_ERROR,

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

  404.                log2_max_frame_num_minus4);

  405.         goto fail;

  406.     }

  407.     sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;

  408. 

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

  410. 

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

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

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

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

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

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

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

  418. 

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

  420.             FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {

  421.             av_log(avctx, AV_LOG_ERROR,

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

  423.             goto fail;

  424.         }

  425. 

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

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

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

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

  430.         goto fail;

  431.     }

  432. 

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

  434.     if (sps->ref_frame_count > MAX_DELAYED_PIC_COUNT) {

  435.         av_log(avctx, AV_LOG_ERROR,

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

  437.         goto fail;

  438.     }

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

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

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

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

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

  444.         av_image_check_size(16 * sps->mb_width,

  445.                             16 * sps->mb_height, 0, avctx)) {

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

  447.         goto fail;

  448.     }

  449. 

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

  451.     if (!sps->frame_mbs_only_flag)

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

  453.     else

  454.         sps->mb_aff = 0;

  455. 

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

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

  458.         av_log(avctx, AV_LOG_ERROR,

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

  460.         goto fail;

  461.     }

  462. 

  463. #ifndef ALLOW_INTERLACE

  464.     if (sps->mb_aff)

  465.         av_log(avctx, AV_LOG_ERROR,

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

  467. #endif

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

  469.     if (sps->crop) {

  470.         unsigned int crop_left   = get_ue_golomb(gb);

  471.         unsigned int crop_right  = get_ue_golomb(gb);

  472.         unsigned int crop_top    = get_ue_golomb(gb);

  473.         unsigned int crop_bottom = get_ue_golomb(gb);

  474. 

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

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

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

  478.                    crop_left, crop_right, crop_top, crop_bottom);

  479. 

  480.             sps->crop_left   =

  481.             sps->crop_right  =

  482.             sps->crop_top    =

  483.             sps->crop_bottom = 0;

  484.         } else {

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

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

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

  488.             int step_x = 1 << hsub;

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

  490. 

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

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

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

  494.                 av_log(avctx, AV_LOG_WARNING,

  495.                        "Reducing left cropping to %d "

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

  497.                        crop_left);

  498.             }

  499. 

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

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

  502.                 16 * sps->mb_width <= step_x * (crop_left + crop_right) ||

  503.                 INT_MAX / step_y             <= crop_top                ||

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

  505.                 16 * sps->mb_height <= step_y * (crop_top + crop_bottom)) {

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

  507.                 if (avctx->err_recognition & AV_EF_EXPLODE)

  508.                     goto fail;

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

  510.             }

  511. 

  512.             sps->crop_left   = crop_left   * step_x;

  513.             sps->crop_right  = crop_right  * step_x;

  514.             sps->crop_top    = crop_top    * step_y;

  515.             sps->crop_bottom = crop_bottom * step_y;

  516.         }

  517.     } else {

  518.         sps->crop_left   =

  519.         sps->crop_right  =

  520.         sps->crop_top    =

  521.         sps->crop_bottom =

  522.         sps->crop        = 0;

  523.     }

  524. 

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

  526.     if (sps->vui_parameters_present_flag) {

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

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

  529.             goto fail;

  530.     }

  531. 

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

  533.      * level */

  534.     if (!sps->bitstream_restriction_flag &&

  535.         (sps->ref_frame_count || avctx->strict_std_compliance >= FF_COMPLIANCE_STRICT)) {

  536.         sps->num_reorder_frames = MAX_DELAYED_PIC_COUNT - 1;

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

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

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

  540.                                                 sps->num_reorder_frames);

  541.                 break;

  542.             }

  543.         }

  544.     }

  545. 

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

  547.         sps->sar.den = 1;

  548. 

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

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

  551.         av_log(avctx, AV_LOG_DEBUG,

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

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

  554.                sps->poc_type,

  555.                sps->ref_frame_count,

  556.                sps->mb_width, sps->mb_height,

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

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

  559.                sps->crop_left, sps->crop_right,

  560.                sps->crop_top, sps->crop_bottom,

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

  562.                csp[sps->chroma_format_idc],

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

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

  565.     }

  566. 

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

  568.      * original one.

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

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

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

  572.         av_buffer_unref(&sps_buf);

  573.     } else {

  574.         remove_sps(ps, sps_id);

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

  576.     }

  577. 

  578.     return 0;

  579. 

  580. fail:

  581.     av_buffer_unref(&sps_buf);

  582.     return AVERROR_INVALIDDATA;

  583. }

  584. 

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

  586. {

  587.     int i, j, q, x;

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

  589. 

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

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

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

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

  594.                         64 * sizeof(uint8_t))) {

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

  596.                 break;

  597.             }

  598.         if (j < i)

  599.             continue;

  600. 

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

  602.             int shift = ff_h264_quant_div6[q];

  603.             int idx   = ff_h264_quant_rem6[q];

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

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

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

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

  608.         }

  609.     }

  610. }

  611. 

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

  613. {

  614.     int i, j, q, x;

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

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

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

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

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

  620.                         16 * sizeof(uint8_t))) {

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

  622.                 break;

  623.             }

  624.         if (j < i)

  625.             continue;

  626. 

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

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

  629.             int idx   = ff_h264_quant_rem6[q];

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

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

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

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

  634.         }

  635.     }

  636. }

  637. 

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

  639. {

  640.     int i, x;

  641.     init_dequant4_coeff_table(pps, sps);

  642.     if (pps->transform_8x8_mode)

  643.         init_dequant8_coeff_table(pps, sps);

  644.     if (sps->transform_bypass) {

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

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

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

  648.         if (pps->transform_8x8_mode)

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

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

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

  652.     }

  653. }

  654. 

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

  656. {

  657.     int i;

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

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

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

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

  662. }

  663. 

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

  665.                                          H264ParamSets *ps, int bit_length)

  666. {

  667.     AVBufferRef *pps_buf;

  668.     SPS *sps;

  669.     unsigned int pps_id = get_ue_golomb(gb);

  670.     PPS *pps;

  671.     int qp_bd_offset;

  672.     int bits_left;

  673.     int ret;

  674. 

  675.     if (pps_id >= MAX_PPS_COUNT) {

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

  677.         return AVERROR_INVALIDDATA;

  678.     }

  679. 

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

  681.     if (!pps_buf)

  682.         return AVERROR(ENOMEM);

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

  684. 

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

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

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

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

  689.         ret = AVERROR_INVALIDDATA;

  690.         goto fail;

  691.     }

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

  693. 

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

  695.         av_log(avctx, AV_LOG_ERROR,

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

  697.                sps->bit_depth_luma);

  698.         ret = AVERROR_PATCHWELCOME;

  699.         goto fail;

  700.     }

  701. 

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

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

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

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

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

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

  708.         switch (pps->mb_slice_group_map_type) {

  709.         case 0:

  710. #if 0

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

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

  713. #endif

  714.             break;

  715.         case 2:

  716. #if 0

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

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

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

  720.     |       }                                               |   |      |

  721. #endif

  722.             break;

  723.         case 3:

  724.         case 4:

  725.         case 5:

  726. #if 0

  727.     |       slice_group_change_direction_flag               |1  |u(1)  |

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

  729. #endif

  730.             break;

  731.         case 6:

  732. #if 0

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

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

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

  736. #endif

  737.             break;

  738.         }

  739.     }

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

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

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

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

  744.         ret = AVERROR_INVALIDDATA;

  745.         goto fail;

  746.     }

  747. 

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

  749. 

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

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

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

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

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

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

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

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

  758. 

  759.     pps->transform_8x8_mode = 0;

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

  761.            sizeof(pps->scaling_matrix4));

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

  763.            sizeof(pps->scaling_matrix8));

  764. 

  765.     bits_left = bit_length - get_bits_count(gb);

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

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

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

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

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

  771.         // second_chroma_qp_index_offset

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

  773.     } else {

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

  775.     }

  776. 

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

  778.                    sps->bit_depth_luma);

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

  780.                    sps->bit_depth_luma);

  781. 

  782.     init_dequant_tables(pps, sps);

  783. 

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

  785.         pps->chroma_qp_diff = 1;

  786. 

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

  788.         av_log(avctx, AV_LOG_DEBUG,

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

  790.                pps_id, pps->sps_id,

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

  792.                pps->slice_group_count,

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

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

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

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

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

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

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

  800.     }

  801. 

  802.     remove_pps(ps, pps_id);

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

  804. 

  805.     return 0;

  806. 

  807. fail:

  808.     av_buffer_unref(&pps_buf);

  809.     return ret;

  810. }