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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 "libavutil/imgutils.h"

  29. #include "internal.h"

  30. #include "avcodec.h"

  31. #include "h264.h"

  32. #include "h264data.h" //FIXME FIXME FIXME (just for zigzag_scan)

  33. #include "golomb.h"

  34. 

  35. #define MAX_LOG2_MAX_FRAME_NUM    (12 + 4)

  36. #define MIN_LOG2_MAX_FRAME_NUM    4

  37. 

  38. static const AVRational pixel_aspect[17] = {

  39.     {   0,  1 },

  40.     {   1,  1 },

  41.     {  12, 11 },

  42.     {  10, 11 },

  43.     {  16, 11 },

  44.     {  40, 33 },

  45.     {  24, 11 },

  46.     {  20, 11 },

  47.     {  32, 11 },

  48.     {  80, 33 },

  49.     {  18, 11 },

  50.     {  15, 11 },

  51.     {  64, 33 },

  52.     { 160, 99 },

  53.     {   4,  3 },

  54.     {   3,  2 },

  55.     {   2,  1 },

  56. };

  57. 

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

  59. 

  60. #define CHROMA_QP_TABLE_END(d)                                          \

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

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

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

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

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

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

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

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

  69.     QP(39, d), QP(39, d), QP(39, d), QP(39, d)

  70. 

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

  72.     { CHROMA_QP_TABLE_END(8) },

  73.     { 0, 1, 2, 3, 4, 5,

  74.       CHROMA_QP_TABLE_END(9) },

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

  76.       6, 7, 8, 9, 10, 11,

  77.       CHROMA_QP_TABLE_END(10) },

  78. };

  79. 

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

  81.     {  6, 13, 20, 28, 13, 20, 28, 32,

  82.       20, 28, 32, 37, 28, 32, 37, 42 },

  83.     { 10, 14, 20, 24, 14, 20, 24, 27,

  84.       20, 24, 27, 30, 24, 27, 30, 34 }

  85. };

  86. 

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

  88.     {  6, 10, 13, 16, 18, 23, 25, 27,

  89.       10, 11, 16, 18, 23, 25, 27, 29,

  90.       13, 16, 18, 23, 25, 27, 29, 31,

  91.       16, 18, 23, 25, 27, 29, 31, 33,

  92.       18, 23, 25, 27, 29, 31, 33, 36,

  93.       23, 25, 27, 29, 31, 33, 36, 38,

  94.       25, 27, 29, 31, 33, 36, 38, 40,

  95.       27, 29, 31, 33, 36, 38, 40, 42 },

  96.     {  9, 13, 15, 17, 19, 21, 22, 24,

  97.       13, 13, 17, 19, 21, 22, 24, 25,

  98.       15, 17, 19, 21, 22, 24, 25, 27,

  99.       17, 19, 21, 22, 24, 25, 27, 28,

  100.       19, 21, 22, 24, 25, 27, 28, 30,

  101.       21, 22, 24, 25, 27, 28, 30, 32,

  102.       22, 24, 25, 27, 28, 30, 32, 33,

  103.       24, 25, 27, 28, 30, 32, 33, 35 }

  104. };

  105. 

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

  107. {

  108.     int cpb_count, i;

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

  110. 

  111.     if (cpb_count > 32U) {

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

  113.         return AVERROR_INVALIDDATA;

  114.     }

  115. 

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

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

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

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

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

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

  122.     }

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

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

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

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

  127.     sps->cpb_cnt                          = cpb_count;

  128.     return 0;

  129. }

  130. 

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

  132. {

  133.     int aspect_ratio_info_present_flag;

  134.     unsigned int aspect_ratio_idc;

  135. 

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

  137. 

  138.     if (aspect_ratio_info_present_flag) {

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

  140.         if (aspect_ratio_idc == EXTENDED_SAR) {

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

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

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

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

  145.         } else {

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

  147.             return AVERROR_INVALIDDATA;

  148.         }

  149.     } else {

  150.         sps->sar.num =

  151.         sps->sar.den = 0;

  152.     }

  153. 

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

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

  156. 

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

  158.     if (sps->video_signal_type_present_flag) {

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

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

  161. 

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

  163.         if (sps->colour_description_present_flag) {

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

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

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

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

  168.                 sps->color_primaries = AVCOL_PRI_UNSPECIFIED;

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

  170.                 sps->color_trc = AVCOL_TRC_UNSPECIFIED;

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

  172.                 sps->colorspace = AVCOL_SPC_UNSPECIFIED;

  173.         }

  174.     }

  175. 

  176.     /* chroma_location_info_present_flag */

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

  178.         /* chroma_sample_location_type_top_field */

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

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

  181.     }

  182. 

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

  184.     if (sps->timing_info_present_flag) {

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

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

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

  188.             av_log(h->avctx, AV_LOG_ERROR,

  189.                    "time_scale/num_units_in_tick invalid or unsupported (%d/%d)\n",

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

  191.             return AVERROR_INVALIDDATA;

  192.         }

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

  194.     }

  195. 

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

  197.     if (sps->nal_hrd_parameters_present_flag)

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

  199.             return AVERROR_INVALIDDATA;

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

  201.     if (sps->vcl_hrd_parameters_present_flag)

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

  203.             return AVERROR_INVALIDDATA;

  204.     if (sps->nal_hrd_parameters_present_flag ||

  205.         sps->vcl_hrd_parameters_present_flag)

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

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

  208. 

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

  210.     if (sps->bitstream_restriction_flag) {

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

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

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

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

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

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

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

  218. 

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

  220.             sps->num_reorder_frames         = 0;

  221.             sps->bitstream_restriction_flag = 0;

  222.         }

  223. 

  224.         if (sps->num_reorder_frames > 16U

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

  226.             av_log(h->avctx, AV_LOG_ERROR,

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

  228.                    sps->num_reorder_frames);

  229.             sps->num_reorder_frames = 16;

  230.             return AVERROR_INVALIDDATA;

  231.         }

  232.     }

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

  234.         av_log(h->avctx, AV_LOG_ERROR,

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

  236.         return AVERROR_INVALIDDATA;

  237.     }

  238. 

  239.     return 0;

  240. }

  241. 

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

  243.                                 const uint8_t *jvt_list,

  244.                                 const uint8_t *fallback_list)

  245. {

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

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

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

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

  250.     else

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

  252.             if (next)

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

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

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

  256.                 break;

  257.             }

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

  259.         }

  260. }

  261. 

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

  263.                                     PPS *pps, int is_sps,

  264.                                     uint8_t(*scaling_matrix4)[16],

  265.                                     uint8_t(*scaling_matrix8)[64])

  266. {

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

  268.     const uint8_t *fallback[4] = {

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

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

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

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

  273.     };

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

  275.         sps->scaling_matrix_present |= is_sps;

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

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

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

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

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

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

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

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

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

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

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

  287.             }

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

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

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

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

  292.             }

  293.         }

  294.     }

  295. }

  296. 

  297. int ff_h264_decode_seq_parameter_set(H264Context *h)

  298. {

  299.     int profile_idc, level_idc, constraint_set_flags = 0;

  300.     unsigned int sps_id;

  301.     int i, log2_max_frame_num_minus4;

  302.     SPS *sps;

  303. 

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

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

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

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

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

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

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

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

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

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

  314. 

  315.     if (sps_id >= MAX_SPS_COUNT) {

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

  317.         return AVERROR_INVALIDDATA;

  318.     }

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

  320.     if (!sps)

  321.         return AVERROR(ENOMEM);

  322. 

  323.     sps->sps_id               = sps_id;

  324.     sps->time_offset_length   = 24;

  325.     sps->profile_idc          = profile_idc;

  326.     sps->constraint_set_flags = constraint_set_flags;

  327.     sps->level_idc            = level_idc;

  328. 

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

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

  331.     sps->scaling_matrix_present = 0;

  332. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  347.                                   sps->chroma_format_idc);

  348.             goto fail;

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

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

  351.         }

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

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

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

  355.             avpriv_request_sample(h->avctx,

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

  357.             goto fail;

  358.         }

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

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

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

  362.     } else {

  363.         sps->chroma_format_idc = 1;

  364.         sps->bit_depth_luma    = 8;

  365.         sps->bit_depth_chroma  = 8;

  366.     }

  367. 

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

  369.     if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||

  370.         log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {

  371.         av_log(h->avctx, AV_LOG_ERROR,

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

  373.                log2_max_frame_num_minus4);

  374.         goto fail;

  375.     }

  376.     sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;

  377. 

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

  379. 

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

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

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

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

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

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

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

  387. 

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

  389.             FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {

  390.             av_log(h->avctx, AV_LOG_ERROR,

  391.                    "poc_cycle_length overflow %u\n", sps->poc_cycle_length);

  392.             goto fail;

  393.         }

  394. 

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

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

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

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

  399.         goto fail;

  400.     }

  401. 

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

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

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

  405.         av_log(h->avctx, AV_LOG_ERROR,

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

  407.         goto fail;

  408.     }

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

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

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

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

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

  414.         av_image_check_size(16 * sps->mb_width,

  415.                             16 * sps->mb_height, 0, h->avctx)) {

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

  417.         goto fail;

  418.     }

  419. 

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

  421.     if (!sps->frame_mbs_only_flag)

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

  423.     else

  424.         sps->mb_aff = 0;

  425. 

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

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

  428.         av_log(h->avctx, AV_LOG_ERROR,

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

  430.         goto fail;

  431.     }

  432. 

  433. #ifndef ALLOW_INTERLACE

  434.     if (sps->mb_aff)

  435.         av_log(h->avctx, AV_LOG_ERROR,

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

  437. #endif

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

  439.     if (sps->crop) {

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

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

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

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

  444. 

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

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

  447.                                            "values are l:%u r:%u t:%u b:%u\n",

  448.                    crop_left, crop_right, crop_top, crop_bottom);

  449. 

  450.             sps->crop_left   =

  451.             sps->crop_right  =

  452.             sps->crop_top    =

  453.             sps->crop_bottom = 0;

  454.         } else {

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

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

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

  458.             int step_x = 1 << hsub;

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

  460. 

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

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

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

  464.                 av_log(h->avctx, AV_LOG_WARNING,

  465.                        "Reducing left cropping to %d "

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

  467.                        crop_left);

  468.             }

  469. 

  470.             sps->crop_left   = crop_left   * step_x;

  471.             sps->crop_right  = crop_right  * step_x;

  472.             sps->crop_top    = crop_top    * step_y;

  473.             sps->crop_bottom = crop_bottom * step_y;

  474.         }

  475.     } else {

  476.         sps->crop_left   =

  477.         sps->crop_right  =

  478.         sps->crop_top    =

  479.         sps->crop_bottom =

  480.         sps->crop        = 0;

  481.     }

  482. 

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

  484.     if (sps->vui_parameters_present_flag) {

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

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

  487.             goto fail;

  488.     }

  489. 

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

  491.         sps->sar.den = 1;

  492. 

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

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

  495.         av_log(h->avctx, AV_LOG_DEBUG,

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

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

  498.                sps->poc_type,

  499.                sps->ref_frame_count,

  500.                sps->mb_width, sps->mb_height,

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

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

  503.                sps->crop_left, sps->crop_right,

  504.                sps->crop_top, sps->crop_bottom,

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

  506.                csp[sps->chroma_format_idc],

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

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

  509.     }

  510.     sps->new = 1;

  511. 

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

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

  514.     h->sps                 = *sps;

  515. 

  516.     return 0;

  517. 

  518. fail:

  519.     av_free(sps);

  520.     return -1;

  521. }

  522. 

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

  524. {

  525.     int i;

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

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

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

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

  530. }

  531. 

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

  533. {

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

  535.     PPS *pps;

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

  537.     int bits_left;

  538. 

  539.     if (pps_id >= MAX_PPS_COUNT) {

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

  541.         return AVERROR_INVALIDDATA;

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

  543.         av_log(h->avctx, AV_LOG_ERROR,

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

  545.                h->sps.bit_depth_luma);

  546.         return AVERROR_PATCHWELCOME;

  547.     }

  548. 

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

  550.     if (!pps)

  551.         return AVERROR(ENOMEM);

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

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

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

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

  556.         goto fail;

  557.     }

  558. 

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

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

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

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

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

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

  565.         switch (pps->mb_slice_group_map_type) {

  566.         case 0:

  567. #if 0

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

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

  570. #endif

  571.             break;

  572.         case 2:

  573. #if 0

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

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

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

  577.     |       }                                               |   |      |

  578. #endif

  579.             break;

  580.         case 3:

  581.         case 4:

  582.         case 5:

  583. #if 0

  584.     |       slice_group_change_direction_flag               |1  |u(1)  |

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

  586. #endif

  587.             break;

  588.         case 6:

  589. #if 0

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

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

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

  593. #endif

  594.             break;

  595.         }

  596.     }

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

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

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

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

  601.         goto fail;

  602.     }

  603. 

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

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

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

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

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

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

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

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

  612. 

  613.     pps->transform_8x8_mode = 0;

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

  615.     h->dequant_coeff_pps = -1;

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

  617.            sizeof(pps->scaling_matrix4));

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

  619.            sizeof(pps->scaling_matrix8));

  620. 

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

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

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

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

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

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

  627.         // second_chroma_qp_index_offset

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

  629.     } else {

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

  631.     }

  632. 

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

  634.                    h->sps.bit_depth_luma);

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

  636.                    h->sps.bit_depth_luma);

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

  638.         pps->chroma_qp_diff = 1;

  639. 

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

  641.         av_log(h->avctx, AV_LOG_DEBUG,

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

  643.                pps_id, pps->sps_id,

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

  645.                pps->slice_group_count,

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

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

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

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

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

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

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

  653.     }

  654. 

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

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

  657.     return 0;

  658. 

  659. fail:

  660.     av_free(pps);

  661.     return -1;

  662. }