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.
45081 Commits
32 Branches
296MB
Tree: 31a53ab34e
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '31a53ab34e'
${ noResults }
FFmpeg/libavcodec/h264_ps.c

781 lines
29KB
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. 

  32. #include "golomb_legacy.h"

  33. #include "internal.h"

  34. #include "mathops.h"

  35. #include "avcodec.h"

  36. #include "h264data.h"

  37. #include "h264_ps.h"

  38. 

  39. #define MAX_LOG2_MAX_FRAME_NUM    (12 + 4)

  40. #define MIN_LOG2_MAX_FRAME_NUM    4

  41. 

  42. #define EXTENDED_SAR       255

  43. 

  44. static const AVRational pixel_aspect[17] = {

  45.     {   0,  1 },

  46.     {   1,  1 },

  47.     {  12, 11 },

  48.     {  10, 11 },

  49.     {  16, 11 },

  50.     {  40, 33 },

  51.     {  24, 11 },

  52.     {  20, 11 },

  53.     {  32, 11 },

  54.     {  80, 33 },

  55.     {  18, 11 },

  56.     {  15, 11 },

  57.     {  64, 33 },

  58.     { 160, 99 },

  59.     {   4,  3 },

  60.     {   3,  2 },

  61.     {   2,  1 },

  62. };

  63. 

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

  65.     {  6, 13, 20, 28, 13, 20, 28, 32,

  66.       20, 28, 32, 37, 28, 32, 37, 42 },

  67.     { 10, 14, 20, 24, 14, 20, 24, 27,

  68.       20, 24, 27, 30, 24, 27, 30, 34 }

  69. };

  70. 

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

  72.     {  6, 10, 13, 16, 18, 23, 25, 27,

  73.       10, 11, 16, 18, 23, 25, 27, 29,

  74.       13, 16, 18, 23, 25, 27, 29, 31,

  75.       16, 18, 23, 25, 27, 29, 31, 33,

  76.       18, 23, 25, 27, 29, 31, 33, 36,

  77.       23, 25, 27, 29, 31, 33, 36, 38,

  78.       25, 27, 29, 31, 33, 36, 38, 40,

  79.       27, 29, 31, 33, 36, 38, 40, 42 },

  80.     {  9, 13, 15, 17, 19, 21, 22, 24,

  81.       13, 13, 17, 19, 21, 22, 24, 25,

  82.       15, 17, 19, 21, 22, 24, 25, 27,

  83.       17, 19, 21, 22, 24, 25, 27, 28,

  84.       19, 21, 22, 24, 25, 27, 28, 30,

  85.       21, 22, 24, 25, 27, 28, 30, 32,

  86.       22, 24, 25, 27, 28, 30, 32, 33,

  87.       24, 25, 27, 28, 30, 32, 33, 35 }

  88. };

  89. 

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

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

  92.     { 10, 396       },

  93.     { 11, 900       },

  94.     { 12, 2376      },

  95.     { 13, 2376      },

  96.     { 20, 2376      },

  97.     { 21, 4752      },

  98.     { 22, 8100      },

  99.     { 30, 8100      },

  100.     { 31, 18000     },

  101.     { 32, 20480     },

  102.     { 40, 32768     },

  103.     { 41, 32768     },

  104.     { 42, 34816     },

  105.     { 50, 110400    },

  106.     { 51, 184320    },

  107.     { 52, 184320    },

  108. };

  109. 

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

  111. {

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

  113.         s->pps = NULL;

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

  115. }

  116. 

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

  118. {

  119.     int i;

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

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

  122.             s->sps = NULL;

  123. 

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

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

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

  127.                 remove_pps(s, i);

  128.     }

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

  130. }

  131. 

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

  133.                                         SPS *sps)

  134. {

  135.     int cpb_count, i;

  136.     cpb_count = get_ue_golomb_31(gb) + 1;

  137. 

  138.     if (cpb_count > 32U) {

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

  140.         return AVERROR_INVALIDDATA;

  141.     }

  142. 

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

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

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

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

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

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

  149.     }

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

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

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

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

  154.     sps->cpb_cnt                          = cpb_count;

  155.     return 0;

  156. }

  157. 

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

  159.                                         SPS *sps)

  160. {

  161.     int aspect_ratio_info_present_flag;

  162.     unsigned int aspect_ratio_idc;

  163. 

  164.     aspect_ratio_info_present_flag = get_bits1(gb);

  165. 

  166.     if (aspect_ratio_info_present_flag) {

  167.         aspect_ratio_idc = get_bits(gb, 8);

  168.         if (aspect_ratio_idc == EXTENDED_SAR) {

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

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

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

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

  173.         } else {

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

  175.             return AVERROR_INVALIDDATA;

  176.         }

  177.     } else {

  178.         sps->sar.num =

  179.         sps->sar.den = 0;

  180.     }

  181. 

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

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

  184. 

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

  186.     if (sps->video_signal_type_present_flag) {

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

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

  189. 

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

  191.         if (sps->colour_description_present_flag) {

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

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

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

  195. 

  196.             // Set invalid values to "unspecified"

  197.             if (!av_color_primaries_name(sps->color_primaries))

  198.                 sps->color_primaries = AVCOL_PRI_UNSPECIFIED;

  199.             if (!av_color_transfer_name(sps->color_trc))

  200.                 sps->color_trc = AVCOL_TRC_UNSPECIFIED;

  201.             if (!av_color_space_name(sps->colorspace))

  202.                 sps->colorspace = AVCOL_SPC_UNSPECIFIED;

  203.         }

  204.     }

  205. 

  206.     /* chroma_location_info_present_flag */

  207.     if (get_bits1(gb)) {

  208.         /* chroma_sample_location_type_top_field */

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

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

  211.     }

  212. 

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

  214.     if (sps->timing_info_present_flag) {

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

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

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

  218.             av_log(avctx, AV_LOG_ERROR,

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

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

  221.             return AVERROR_INVALIDDATA;

  222.         }

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

  224.     }

  225. 

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

  227.     if (sps->nal_hrd_parameters_present_flag)

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

  229.             return AVERROR_INVALIDDATA;

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

  231.     if (sps->vcl_hrd_parameters_present_flag)

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

  233.             return AVERROR_INVALIDDATA;

  234.     if (sps->nal_hrd_parameters_present_flag ||

  235.         sps->vcl_hrd_parameters_present_flag)

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

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

  238. 

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

  240.     if (sps->bitstream_restriction_flag) {

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

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

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

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

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

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

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

  248. 

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

  250.             sps->num_reorder_frames         = 0;

  251.             sps->bitstream_restriction_flag = 0;

  252.         }

  253. 

  254.         if (sps->num_reorder_frames > 16U

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

  256.             av_log(avctx, AV_LOG_ERROR,

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

  258.                    sps->num_reorder_frames);

  259.             sps->num_reorder_frames = 16;

  260.             return AVERROR_INVALIDDATA;

  261.         }

  262.     }

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

  264.         av_log(avctx, AV_LOG_ERROR,

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

  266.         return AVERROR_INVALIDDATA;

  267.     }

  268. 

  269.     return 0;

  270. }

  271. 

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

  273.                                 const uint8_t *jvt_list,

  274.                                 const uint8_t *fallback_list)

  275. {

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

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

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

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

  280.     else

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

  282.             if (next)

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

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

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

  286.                 break;

  287.             }

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

  289.         }

  290. }

  291. 

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

  293.                                     PPS *pps, int is_sps,

  294.                                     uint8_t(*scaling_matrix4)[16],

  295.                                     uint8_t(*scaling_matrix8)[64])

  296. {

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

  298.     const uint8_t *fallback[4] = {

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

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

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

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

  303.     };

  304.     if (get_bits1(gb)) {

  305.         sps->scaling_matrix_present |= is_sps;

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

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

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

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

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

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

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

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

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

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

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

  317.             }

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

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

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

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

  322.             }

  323.         }

  324.     }

  325. }

  326. 

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

  328.                                      H264ParamSets *ps)

  329. {

  330.     AVBufferRef *sps_buf;

  331.     int profile_idc, level_idc, constraint_set_flags = 0;

  332.     unsigned int sps_id;

  333.     int i, log2_max_frame_num_minus4;

  334.     SPS *sps;

  335. 

  336.     profile_idc           = get_bits(gb, 8);

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

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

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

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

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

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

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

  344.     level_idc = get_bits(gb, 8);

  345.     sps_id    = get_ue_golomb_31(gb);

  346. 

  347.     if (sps_id >= MAX_SPS_COUNT) {

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

  349.         return AVERROR_INVALIDDATA;

  350.     }

  351. 

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

  353.     if (!sps_buf)

  354.         return AVERROR(ENOMEM);

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

  356. 

  357.     sps->sps_id               = sps_id;

  358.     sps->time_offset_length   = 24;

  359.     sps->profile_idc          = profile_idc;

  360.     sps->constraint_set_flags = constraint_set_flags;

  361.     sps->level_idc            = level_idc;

  362. 

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

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

  365.     sps->scaling_matrix_present = 0;

  366. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  381.                                   sps->chroma_format_idc);

  382.             goto fail;

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

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

  385.         }

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

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

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

  389.             avpriv_request_sample(avctx,

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

  391.             goto fail;

  392.         }

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

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

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

  396.     } else {

  397.         sps->chroma_format_idc = 1;

  398.         sps->bit_depth_luma    = 8;

  399.         sps->bit_depth_chroma  = 8;

  400.     }

  401. 

  402.     log2_max_frame_num_minus4 = get_ue_golomb(gb);

  403.     if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||

  404.         log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {

  405.         av_log(avctx, AV_LOG_ERROR,

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

  407.                log2_max_frame_num_minus4);

  408.         goto fail;

  409.     }

  410.     sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;

  411. 

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

  413. 

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

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

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

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

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

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

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

  421. 

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

  423.             FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {

  424.             av_log(avctx, AV_LOG_ERROR,

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

  426.             goto fail;

  427.         }

  428. 

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

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

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

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

  433.         goto fail;

  434.     }

  435. 

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

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

  438.         av_log(avctx, AV_LOG_ERROR,

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

  440.         goto fail;

  441.     }

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

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

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

  445. 

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

  447. 

  448.     if (sps->mb_height >= INT_MAX / 2) {

  449.         av_log(avctx, AV_LOG_ERROR, "height overflow\n");

  450.         goto fail;

  451.     }

  452.     sps->mb_height *= 2 - sps->frame_mbs_only_flag;

  453. 

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

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

  456.         av_image_check_size(16 * sps->mb_width,

  457.                             16 * sps->mb_height, 0, avctx)) {

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

  459.         goto fail;

  460.     }

  461. 

  462.     if (!sps->frame_mbs_only_flag)

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

  464.     else

  465.         sps->mb_aff = 0;

  466. 

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

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

  469.         av_log(avctx, AV_LOG_ERROR,

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

  471.         goto fail;

  472.     }

  473. 

  474. #ifndef ALLOW_INTERLACE

  475.     if (sps->mb_aff)

  476.         av_log(avctx, AV_LOG_ERROR,

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

  478. #endif

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

  480.     if (sps->crop) {

  481.         unsigned int crop_left   = get_ue_golomb(gb);

  482.         unsigned int crop_right  = get_ue_golomb(gb);

  483.         unsigned int crop_top    = get_ue_golomb(gb);

  484.         unsigned int crop_bottom = get_ue_golomb(gb);

  485. 

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

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

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

  489.                    crop_left, crop_right, crop_top, crop_bottom);

  490. 

  491.             sps->crop_left   =

  492.             sps->crop_right  =

  493.             sps->crop_top    =

  494.             sps->crop_bottom = 0;

  495.         } else {

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

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

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

  499.             int step_x = 1 << hsub;

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

  501. 

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

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

  504.                 16 * sps->mb_width <= step_x * (crop_left + crop_right) ||

  505.                 INT_MAX / step_y             <= crop_top                ||

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

  507.                 16 * sps->mb_height <= step_y * (crop_top + crop_bottom)) {

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

  509.                 if (avctx->err_recognition & AV_EF_EXPLODE)

  510.                     goto fail;

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

  512.             }

  513. 

  514.             sps->crop_left   = crop_left   * step_x;

  515.             sps->crop_right  = crop_right  * step_x;

  516.             sps->crop_top    = crop_top    * step_y;

  517.             sps->crop_bottom = crop_bottom * step_y;

  518.         }

  519.     } else {

  520.         sps->crop_left   =

  521.         sps->crop_right  =

  522.         sps->crop_top    =

  523.         sps->crop_bottom =

  524.         sps->crop        = 0;

  525.     }

  526. 

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

  528.     if (sps->vui_parameters_present_flag) {

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

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

  531.             goto fail;

  532.     }

  533. 

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

  535.      * level */

  536.     if (!sps->bitstream_restriction_flag &&

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

  538.         sps->num_reorder_frames = MAX_DELAYED_PIC_COUNT - 1;

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

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

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

  542.                                                 sps->num_reorder_frames);

  543.                 break;

  544.             }

  545.         }

  546.     }

  547. 

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

  549.         sps->sar.den = 1;

  550. 

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

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

  553.         av_log(avctx, AV_LOG_DEBUG,

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

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

  556.                sps->poc_type,

  557.                sps->ref_frame_count,

  558.                sps->mb_width, sps->mb_height,

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

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

  561.                sps->crop_left, sps->crop_right,

  562.                sps->crop_top, sps->crop_bottom,

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

  564.                csp[sps->chroma_format_idc],

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

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

  567.     }

  568. 

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

  570.      * original one.

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

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

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

  574.         av_buffer_unref(&sps_buf);

  575.     } else {

  576.         remove_sps(ps, sps_id);

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

  578.     }

  579. 

  580.     return 0;

  581. 

  582. fail:

  583.     av_buffer_unref(&sps_buf);

  584.     return AVERROR_INVALIDDATA;

  585. }

  586. 

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

  588. {

  589.     int i, j, q, x;

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

  591. 

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

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

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

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

  596.                         64 * sizeof(uint8_t))) {

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

  598.                 break;

  599.             }

  600.         if (j < i)

  601.             continue;

  602. 

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

  604.             int shift = ff_h264_quant_div6[q];

  605.             int idx   = ff_h264_quant_rem6[q];

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

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

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

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

  610.         }

  611.     }

  612. }

  613. 

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

  615. {

  616.     int i, j, q, x;

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

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

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

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

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

  622.                         16 * sizeof(uint8_t))) {

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

  624.                 break;

  625.             }

  626.         if (j < i)

  627.             continue;

  628. 

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

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

  631.             int idx   = ff_h264_quant_rem6[q];

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

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

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

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

  636.         }

  637.     }

  638. }

  639. 

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

  641. {

  642.     int i, x;

  643.     init_dequant4_coeff_table(pps, sps);

  644.     if (pps->transform_8x8_mode)

  645.         init_dequant8_coeff_table(pps, sps);

  646.     if (sps->transform_bypass) {

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

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

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

  650.         if (pps->transform_8x8_mode)

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

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

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

  654.     }

  655. }

  656. 

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

  658. {

  659.     int i;

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

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

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

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

  664. }

  665. 

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

  667.                                          H264ParamSets *ps, int bit_length)

  668. {

  669.     AVBufferRef *pps_buf;

  670.     SPS *sps;

  671.     unsigned int pps_id = get_ue_golomb(gb);

  672.     PPS *pps;

  673.     int qp_bd_offset;

  674.     int bits_left;

  675.     int ret;

  676. 

  677.     if (pps_id >= MAX_PPS_COUNT) {

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

  679.         return AVERROR_INVALIDDATA;

  680.     }

  681. 

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

  683.     if (!pps_buf)

  684.         return AVERROR(ENOMEM);

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

  686. 

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

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

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

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

  691.         ret = AVERROR_INVALIDDATA;

  692.         goto fail;

  693.     }

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

  695. 

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

  697.         avpriv_report_missing_feature(avctx, "Luma bit depth=%d (max=10)",

  698.                                       sps->bit_depth_luma);

  699.         ret = AVERROR_PATCHWELCOME;

  700.         goto fail;

  701.     }

  702. 

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

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

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

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

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

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

  709.     }

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

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

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

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

  714.         ret = AVERROR_INVALIDDATA;

  715.         goto fail;

  716.     }

  717. 

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

  719. 

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

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

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

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

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

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

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

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

  728. 

  729.     pps->transform_8x8_mode = 0;

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

  731.            sizeof(pps->scaling_matrix4));

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

  733.            sizeof(pps->scaling_matrix8));

  734. 

  735.     bits_left = bit_length - get_bits_count(gb);

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

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

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

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

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

  741.         // second_chroma_qp_index_offset

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

  743.     } else {

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

  745.     }

  746. 

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

  748.                    sps->bit_depth_luma);

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

  750.                    sps->bit_depth_luma);

  751. 

  752.     init_dequant_tables(pps, sps);

  753. 

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

  755.         pps->chroma_qp_diff = 1;

  756. 

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

  758.         av_log(avctx, AV_LOG_DEBUG,

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

  760.                pps_id, pps->sps_id,

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

  762.                pps->slice_group_count,

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

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

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

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

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

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

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

  770.     }

  771. 

  772.     remove_pps(ps, pps_id);

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

  774. 

  775.     return 0;

  776. 

  777. fail:

  778.     av_buffer_unref(&pps_buf);

  779.     return ret;

  780. }