LCOV - code coverage report
Current view: top level - libavcodec - h264_parse.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 241 272 88.6 %
Date: 2017-12-16 01:21:47 Functions: 9 9 100.0 %

          Line data    Source code
       1             : /*
       2             :  * This file is part of FFmpeg.
       3             :  *
       4             :  * FFmpeg is free software; you can redistribute it and/or
       5             :  * modify it under the terms of the GNU Lesser General Public
       6             :  * License as published by the Free Software Foundation; either
       7             :  * version 2.1 of the License, or (at your option) any later version.
       8             :  *
       9             :  * FFmpeg is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12             :  * Lesser General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU Lesser General Public
      15             :  * License along with FFmpeg; if not, write to the Free Software
      16             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      17             :  */
      18             : 
      19             : #include "bytestream.h"
      20             : #include "get_bits.h"
      21             : #include "golomb.h"
      22             : #include "h264.h"
      23             : #include "h264dec.h"
      24             : #include "h264_parse.h"
      25             : #include "h264_ps.h"
      26             : 
      27        2509 : int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
      28             :                               const int *ref_count, int slice_type_nos,
      29             :                               H264PredWeightTable *pwt,
      30             :                               int picture_structure, void *logctx)
      31             : {
      32             :     int list, i, j;
      33             :     int luma_def, chroma_def;
      34             : 
      35        2509 :     pwt->use_weight             = 0;
      36        2509 :     pwt->use_weight_chroma      = 0;
      37             : 
      38        2509 :     pwt->luma_log2_weight_denom = get_ue_golomb(gb);
      39        2509 :     if (pwt->luma_log2_weight_denom > 7U) {
      40           0 :         av_log(logctx, AV_LOG_ERROR, "luma_log2_weight_denom %d is out of range\n", pwt->luma_log2_weight_denom);
      41           0 :         pwt->luma_log2_weight_denom = 0;
      42             :     }
      43        2509 :     luma_def = 1 << pwt->luma_log2_weight_denom;
      44             : 
      45        2509 :     if (sps->chroma_format_idc) {
      46        2509 :         pwt->chroma_log2_weight_denom = get_ue_golomb(gb);
      47        2509 :         if (pwt->chroma_log2_weight_denom > 7U) {
      48           0 :             av_log(logctx, AV_LOG_ERROR, "chroma_log2_weight_denom %d is out of range\n", pwt->chroma_log2_weight_denom);
      49           0 :             pwt->chroma_log2_weight_denom = 0;
      50             :         }
      51        2509 :         chroma_def = 1 << pwt->chroma_log2_weight_denom;
      52             :     }
      53             : 
      54        3101 :     for (list = 0; list < 2; list++) {
      55        2805 :         pwt->luma_weight_flag[list]   = 0;
      56        2805 :         pwt->chroma_weight_flag[list] = 0;
      57       15091 :         for (i = 0; i < ref_count[list]; i++) {
      58             :             int luma_weight_flag, chroma_weight_flag;
      59             : 
      60       12286 :             luma_weight_flag = get_bits1(gb);
      61       12286 :             if (luma_weight_flag) {
      62        5320 :                 pwt->luma_weight[i][list][0] = get_se_golomb(gb);
      63        5320 :                 pwt->luma_weight[i][list][1] = get_se_golomb(gb);
      64       10640 :                 if ((int8_t)pwt->luma_weight[i][list][0] != pwt->luma_weight[i][list][0] ||
      65        5320 :                     (int8_t)pwt->luma_weight[i][list][1] != pwt->luma_weight[i][list][1])
      66             :                     goto out_range_weight;
      67        6880 :                 if (pwt->luma_weight[i][list][0] != luma_def ||
      68        1560 :                     pwt->luma_weight[i][list][1] != 0) {
      69        4795 :                     pwt->use_weight             = 1;
      70        4795 :                     pwt->luma_weight_flag[list] = 1;
      71             :                 }
      72             :             } else {
      73        6966 :                 pwt->luma_weight[i][list][0] = luma_def;
      74        6966 :                 pwt->luma_weight[i][list][1] = 0;
      75             :             }
      76             : 
      77       12286 :             if (sps->chroma_format_idc) {
      78       12286 :                 chroma_weight_flag = get_bits1(gb);
      79       12286 :                 if (chroma_weight_flag) {
      80             :                     int j;
      81        8523 :                     for (j = 0; j < 2; j++) {
      82        5682 :                         pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb);
      83        5682 :                         pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb);
      84       11364 :                         if ((int8_t)pwt->chroma_weight[i][list][j][0] != pwt->chroma_weight[i][list][j][0] ||
      85        5682 :                             (int8_t)pwt->chroma_weight[i][list][j][1] != pwt->chroma_weight[i][list][j][1])
      86             :                             goto out_range_weight;
      87        6261 :                         if (pwt->chroma_weight[i][list][j][0] != chroma_def ||
      88         579 :                             pwt->chroma_weight[i][list][j][1] != 0) {
      89        5673 :                             pwt->use_weight_chroma        = 1;
      90        5673 :                             pwt->chroma_weight_flag[list] = 1;
      91             :                         }
      92             :                     }
      93             :                 } else {
      94             :                     int j;
      95       28335 :                     for (j = 0; j < 2; j++) {
      96       18890 :                         pwt->chroma_weight[i][list][j][0] = chroma_def;
      97       18890 :                         pwt->chroma_weight[i][list][j][1] = 0;
      98             :                     }
      99             :                 }
     100             :             }
     101             : 
     102             :             // for MBAFF
     103       12286 :             if (picture_structure == PICT_FRAME) {
     104       10794 :                 pwt->luma_weight[16 + 2 * i][list][0] = pwt->luma_weight[16 + 2 * i + 1][list][0] = pwt->luma_weight[i][list][0];
     105       10794 :                 pwt->luma_weight[16 + 2 * i][list][1] = pwt->luma_weight[16 + 2 * i + 1][list][1] = pwt->luma_weight[i][list][1];
     106       10794 :                 if (sps->chroma_format_idc) {
     107       32382 :                     for (j = 0; j < 2; j++) {
     108       21588 :                         pwt->chroma_weight[16 + 2 * i][list][j][0] = pwt->chroma_weight[16 + 2 * i + 1][list][j][0] = pwt->chroma_weight[i][list][j][0];
     109       21588 :                         pwt->chroma_weight[16 + 2 * i][list][j][1] = pwt->chroma_weight[16 + 2 * i + 1][list][j][1] = pwt->chroma_weight[i][list][j][1];
     110             :                     }
     111             :                 }
     112             :             }
     113             :         }
     114        2805 :         if (slice_type_nos != AV_PICTURE_TYPE_B)
     115        2213 :             break;
     116             :     }
     117        2509 :     pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma;
     118        2509 :     return 0;
     119           0 : out_range_weight:
     120           0 :     avpriv_request_sample(logctx, "Out of range weight\n");
     121           0 :     return AVERROR_INVALIDDATA;
     122             : }
     123             : 
     124             : /**
     125             :  * Check if the top & left blocks are available if needed and
     126             :  * change the dc mode so it only uses the available blocks.
     127             :  */
     128     2885152 : int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
     129             :                                      int top_samples_available, int left_samples_available)
     130             : {
     131             :     static const int8_t top[12] = {
     132             :         -1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
     133             :     };
     134             :     static const int8_t left[12] = {
     135             :         0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
     136             :     };
     137             :     int i;
     138             : 
     139     2885152 :     if (!(top_samples_available & 0x8000)) {
     140      993335 :         for (i = 0; i < 4; i++) {
     141      794668 :             int status = top[pred_mode_cache[scan8[0] + i]];
     142      794668 :             if (status < 0) {
     143           0 :                 av_log(logctx, AV_LOG_ERROR,
     144             :                        "top block unavailable for requested intra mode %d\n",
     145             :                        status);
     146           0 :                 return AVERROR_INVALIDDATA;
     147      794668 :             } else if (status) {
     148      511353 :                 pred_mode_cache[scan8[0] + i] = status;
     149             :             }
     150             :         }
     151             :     }
     152             : 
     153     2885152 :     if ((left_samples_available & 0x8888) != 0x8888) {
     154             :         static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
     155      315840 :         for (i = 0; i < 4; i++)
     156      252672 :             if (!(left_samples_available & mask[i])) {
     157      252618 :                 int status = left[pred_mode_cache[scan8[0] + 8 * i]];
     158      252618 :                 if (status < 0) {
     159           0 :                     av_log(logctx, AV_LOG_ERROR,
     160             :                            "left block unavailable for requested intra4x4 mode %d\n",
     161             :                            status);
     162           0 :                     return AVERROR_INVALIDDATA;
     163      252618 :                 } else if (status) {
     164       85434 :                     pred_mode_cache[scan8[0] + 8 * i] = status;
     165             :                 }
     166             :             }
     167             :     }
     168             : 
     169     2885152 :     return 0;
     170             : }
     171             : 
     172             : /**
     173             :  * Check if the top & left blocks are available if needed and
     174             :  * change the dc mode so it only uses the available blocks.
     175             :  */
     176     4475326 : int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
     177             :                                   int left_samples_available,
     178             :                                   int mode, int is_chroma)
     179             : {
     180             :     static const int8_t top[4]  = { LEFT_DC_PRED8x8, 1, -1, -1 };
     181             :     static const int8_t left[5] = { TOP_DC_PRED8x8, -1,  2, -1, DC_128_PRED8x8 };
     182             : 
     183     4475326 :     if (mode > 3U) {
     184           3 :         av_log(logctx, AV_LOG_ERROR,
     185             :                "out of range intra chroma pred mode\n");
     186           3 :         return AVERROR_INVALIDDATA;
     187             :     }
     188             : 
     189     4475323 :     if (!(top_samples_available & 0x8000)) {
     190      330413 :         mode = top[mode];
     191      330413 :         if (mode < 0) {
     192           1 :             av_log(logctx, AV_LOG_ERROR,
     193             :                    "top block unavailable for requested intra mode\n");
     194           1 :             return AVERROR_INVALIDDATA;
     195             :         }
     196             :     }
     197             : 
     198     4475322 :     if ((left_samples_available & 0x8080) != 0x8080) {
     199       96315 :         mode = left[mode];
     200       96315 :         if (mode < 0) {
     201           4 :             av_log(logctx, AV_LOG_ERROR,
     202             :                    "left block unavailable for requested intra mode\n");
     203           4 :             return AVERROR_INVALIDDATA;
     204             :         }
     205       96311 :         if (is_chroma && (left_samples_available & 0x8080)) {
     206             :             // mad cow disease mode, aka MBAFF + constrained_intra_pred
     207          54 :             mode = ALZHEIMER_DC_L0T_PRED8x8 +
     208          27 :                    (!(left_samples_available & 0x8000)) +
     209          27 :                    2 * (mode == DC_128_PRED8x8);
     210             :         }
     211             :     }
     212             : 
     213     4475318 :     return mode;
     214             : }
     215             : 
     216       47185 : int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
     217             :                             GetBitContext *gb, const PPS *pps,
     218             :                             int slice_type_nos, int picture_structure, void *logctx)
     219             : {
     220             :     int list_count;
     221             :     int num_ref_idx_active_override_flag;
     222             : 
     223             :     // set defaults, might be overridden a few lines later
     224       47185 :     ref_count[0] = pps->ref_count[0];
     225       47185 :     ref_count[1] = pps->ref_count[1];
     226             : 
     227       47185 :     if (slice_type_nos != AV_PICTURE_TYPE_I) {
     228             :         unsigned max[2];
     229       41421 :         max[0] = max[1] = picture_structure == PICT_FRAME ? 15 : 31;
     230             : 
     231       41421 :         num_ref_idx_active_override_flag = get_bits1(gb);
     232             : 
     233       41421 :         if (num_ref_idx_active_override_flag) {
     234       19366 :             ref_count[0] = get_ue_golomb(gb) + 1;
     235       19366 :             if (slice_type_nos == AV_PICTURE_TYPE_B) {
     236        5558 :                 ref_count[1] = get_ue_golomb(gb) + 1;
     237             :             } else
     238             :                 // full range is spec-ok in this case, even for frames
     239       13808 :                 ref_count[1] = 1;
     240             :         }
     241             : 
     242       41421 :         if (ref_count[0] - 1 > max[0] || ref_count[1] - 1 > max[1]) {
     243          27 :             av_log(logctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n",
     244          18 :                    ref_count[0] - 1, max[0], ref_count[1] - 1, max[1]);
     245           9 :             ref_count[0] = ref_count[1] = 0;
     246           9 :             *plist_count = 0;
     247           9 :             goto fail;
     248             :         }
     249             : 
     250       41412 :         if (slice_type_nos == AV_PICTURE_TYPE_B)
     251       11453 :             list_count = 2;
     252             :         else
     253       29959 :             list_count = 1;
     254             :     } else {
     255        5764 :         list_count   = 0;
     256        5764 :         ref_count[0] = ref_count[1] = 0;
     257             :     }
     258             : 
     259       47176 :     *plist_count = list_count;
     260             : 
     261       47176 :     return 0;
     262           9 : fail:
     263           9 :     *plist_count = 0;
     264           9 :     ref_count[0] = 0;
     265           9 :     ref_count[1] = 0;
     266           9 :     return AVERROR_INVALIDDATA;
     267             : }
     268             : 
     269       50221 : int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
     270             :                      const SPS *sps, H264POCContext *pc,
     271             :                      int picture_structure, int nal_ref_idc)
     272             : {
     273       50221 :     const int max_frame_num = 1 << sps->log2_max_frame_num;
     274             :     int field_poc[2];
     275             : 
     276       50221 :     pc->frame_num_offset = pc->prev_frame_num_offset;
     277       50221 :     if (pc->frame_num < pc->prev_frame_num)
     278         262 :         pc->frame_num_offset += max_frame_num;
     279             : 
     280       50221 :     if (sps->poc_type == 0) {
     281       37515 :         const int max_poc_lsb = 1 << sps->log2_max_poc_lsb;
     282             : 
     283       55256 :         if (pc->poc_lsb < pc->prev_poc_lsb &&
     284       17741 :             pc->prev_poc_lsb - pc->poc_lsb >= max_poc_lsb / 2)
     285         136 :             pc->poc_msb = pc->prev_poc_msb + max_poc_lsb;
     286       54757 :         else if (pc->poc_lsb > pc->prev_poc_lsb &&
     287       17378 :                  pc->prev_poc_lsb - pc->poc_lsb < -max_poc_lsb / 2)
     288         180 :             pc->poc_msb = pc->prev_poc_msb - max_poc_lsb;
     289             :         else
     290       37199 :             pc->poc_msb = pc->prev_poc_msb;
     291       37515 :         field_poc[0] =
     292       37515 :         field_poc[1] = pc->poc_msb + pc->poc_lsb;
     293       37515 :         if (picture_structure == PICT_FRAME)
     294       26487 :             field_poc[1] += pc->delta_poc_bottom;
     295       12706 :     } else if (sps->poc_type == 1) {
     296             :         int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
     297             :         int i;
     298             : 
     299        6507 :         if (sps->poc_cycle_length != 0)
     300        6507 :             abs_frame_num = pc->frame_num_offset + pc->frame_num;
     301             :         else
     302           0 :             abs_frame_num = 0;
     303             : 
     304        6507 :         if (nal_ref_idc == 0 && abs_frame_num > 0)
     305         397 :             abs_frame_num--;
     306             : 
     307        6507 :         expected_delta_per_poc_cycle = 0;
     308       16848 :         for (i = 0; i < sps->poc_cycle_length; i++)
     309             :             // FIXME integrate during sps parse
     310       10341 :             expected_delta_per_poc_cycle += sps->offset_for_ref_frame[i];
     311             : 
     312        6507 :         if (abs_frame_num > 0) {
     313        6420 :             int poc_cycle_cnt          = (abs_frame_num - 1) / sps->poc_cycle_length;
     314        6420 :             int frame_num_in_poc_cycle = (abs_frame_num - 1) % sps->poc_cycle_length;
     315             : 
     316        6420 :             expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
     317       14662 :             for (i = 0; i <= frame_num_in_poc_cycle; i++)
     318        8242 :                 expectedpoc = expectedpoc + sps->offset_for_ref_frame[i];
     319             :         } else
     320          87 :             expectedpoc = 0;
     321             : 
     322        6507 :         if (nal_ref_idc == 0)
     323         397 :             expectedpoc = expectedpoc + sps->offset_for_non_ref_pic;
     324             : 
     325        6507 :         field_poc[0] = expectedpoc + pc->delta_poc[0];
     326        6507 :         field_poc[1] = field_poc[0] + sps->offset_for_top_to_bottom_field;
     327             : 
     328        6507 :         if (picture_structure == PICT_FRAME)
     329        5575 :             field_poc[1] += pc->delta_poc[1];
     330             :     } else {
     331        6199 :         int poc = 2 * (pc->frame_num_offset + pc->frame_num);
     332             : 
     333        6199 :         if (!nal_ref_idc)
     334           0 :             poc--;
     335             : 
     336        6199 :         field_poc[0] = poc;
     337        6199 :         field_poc[1] = poc;
     338             :     }
     339             : 
     340       50221 :     if (picture_structure != PICT_BOTTOM_FIELD)
     341       44246 :         pic_field_poc[0] = field_poc[0];
     342       50221 :     if (picture_structure != PICT_TOP_FIELD)
     343       44236 :         pic_field_poc[1] = field_poc[1];
     344       50221 :     *pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
     345             : 
     346       50221 :     return 0;
     347             : }
     348             : 
     349         411 : static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps,
     350             :                                int is_avc, void *logctx)
     351             : {
     352         411 :     H2645Packet pkt = { 0 };
     353         411 :     int i, ret = 0;
     354             : 
     355         411 :     ret = ff_h2645_packet_split(&pkt, data, size, logctx, is_avc, 2, AV_CODEC_ID_H264, 1);
     356         411 :     if (ret < 0) {
     357           0 :         ret = 0;
     358           0 :         goto fail;
     359             :     }
     360             : 
     361        1026 :     for (i = 0; i < pkt.nb_nals; i++) {
     362         617 :         H2645NAL *nal = &pkt.nals[i];
     363         617 :         switch (nal->type) {
     364         309 :         case H264_NAL_SPS:
     365         309 :             ret = ff_h264_decode_seq_parameter_set(&nal->gb, logctx, ps, 0);
     366         309 :             if (ret < 0)
     367           2 :                 goto fail;
     368         307 :             break;
     369         308 :         case H264_NAL_PPS:
     370         308 :             ret = ff_h264_decode_picture_parameter_set(&nal->gb, logctx, ps,
     371             :                                                        nal->size_bits);
     372         308 :             if (ret < 0)
     373           0 :                 goto fail;
     374         308 :             break;
     375           0 :         default:
     376           0 :             av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n",
     377             :                    nal->type);
     378           0 :             break;
     379             :         }
     380             :     }
     381             : 
     382         409 : fail:
     383         411 :     ff_h2645_packet_uninit(&pkt);
     384         411 :     return ret;
     385             : }
     386             : 
     387             : /* There are (invalid) samples in the wild with mp4-style extradata, where the
     388             :  * parameter sets are stored unescaped (i.e. as RBSP).
     389             :  * This function catches the parameter set decoding failure and tries again
     390             :  * after escaping it */
     391         204 : static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps,
     392             :                                    int err_recognition, void *logctx)
     393             : {
     394             :     int ret;
     395             : 
     396         204 :     ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx);
     397         204 :     if (ret < 0 && !(err_recognition & AV_EF_EXPLODE)) {
     398             :         GetByteContext gbc;
     399             :         PutByteContext pbc;
     400             :         uint8_t *escaped_buf;
     401             :         int escaped_buf_size;
     402             : 
     403           2 :         av_log(logctx, AV_LOG_WARNING,
     404             :                "SPS decoding failure, trying again after escaping the NAL\n");
     405             : 
     406           2 :         if (buf_size / 2 >= (INT16_MAX - AV_INPUT_BUFFER_PADDING_SIZE) / 3)
     407           0 :             return AVERROR(ERANGE);
     408           2 :         escaped_buf_size = buf_size * 3 / 2 + AV_INPUT_BUFFER_PADDING_SIZE;
     409           2 :         escaped_buf = av_mallocz(escaped_buf_size);
     410           2 :         if (!escaped_buf)
     411           0 :             return AVERROR(ENOMEM);
     412             : 
     413           2 :         bytestream2_init(&gbc, buf, buf_size);
     414           2 :         bytestream2_init_writer(&pbc, escaped_buf, escaped_buf_size);
     415             : 
     416          42 :         while (bytestream2_get_bytes_left(&gbc)) {
     417          72 :             if (bytestream2_get_bytes_left(&gbc) >= 3 &&
     418          34 :                 bytestream2_peek_be24(&gbc) <= 3) {
     419           4 :                 bytestream2_put_be24(&pbc, 3);
     420           4 :                 bytestream2_skip(&gbc, 2);
     421             :             } else
     422          34 :                 bytestream2_put_byte(&pbc, bytestream2_get_byte(&gbc));
     423             :         }
     424             : 
     425           2 :         escaped_buf_size = bytestream2_tell_p(&pbc);
     426           2 :         AV_WB16(escaped_buf, escaped_buf_size - 2);
     427             : 
     428           2 :         (void)decode_extradata_ps(escaped_buf, escaped_buf_size, ps, 1, logctx);
     429             :         // lorex.mp4 decodes ok even with extradata decoding failing
     430           2 :         av_freep(&escaped_buf);
     431             :     }
     432             : 
     433         204 :     return 0;
     434             : }
     435             : 
     436         310 : int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps,
     437             :                              int *is_avc, int *nal_length_size,
     438             :                              int err_recognition, void *logctx)
     439             : {
     440             :     int ret;
     441             : 
     442         310 :     if (!data || size <= 0)
     443           0 :         return -1;
     444             : 
     445         310 :     if (data[0] == 1) {
     446             :         int i, cnt, nalsize;
     447         105 :         const uint8_t *p = data;
     448             : 
     449         105 :         *is_avc = 1;
     450             : 
     451         105 :         if (size < 7) {
     452           0 :             av_log(logctx, AV_LOG_ERROR, "avcC %d too short\n", size);
     453           0 :             return AVERROR_INVALIDDATA;
     454             :         }
     455             : 
     456             :         // Decode sps from avcC
     457         105 :         cnt = *(p + 5) & 0x1f; // Number of sps
     458         105 :         p  += 6;
     459         207 :         for (i = 0; i < cnt; i++) {
     460         102 :             nalsize = AV_RB16(p) + 2;
     461         102 :             if (nalsize > size - (p - data))
     462           0 :                 return AVERROR_INVALIDDATA;
     463         102 :             ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
     464         102 :             if (ret < 0) {
     465           0 :                 av_log(logctx, AV_LOG_ERROR,
     466             :                        "Decoding sps %d from avcC failed\n", i);
     467           0 :                 return ret;
     468             :             }
     469         102 :             p += nalsize;
     470             :         }
     471             :         // Decode pps from avcC
     472         105 :         cnt = *(p++); // Number of pps
     473         207 :         for (i = 0; i < cnt; i++) {
     474         102 :             nalsize = AV_RB16(p) + 2;
     475         102 :             if (nalsize > size - (p - data))
     476           0 :                 return AVERROR_INVALIDDATA;
     477         102 :             ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
     478         102 :             if (ret < 0) {
     479           0 :                 av_log(logctx, AV_LOG_ERROR,
     480             :                        "Decoding pps %d from avcC failed\n", i);
     481           0 :                 return ret;
     482             :             }
     483         102 :             p += nalsize;
     484             :         }
     485             :         // Store right nal length size that will be used to parse all other nals
     486         105 :         *nal_length_size = (data[4] & 0x03) + 1;
     487             :     } else {
     488         205 :         *is_avc = 0;
     489         205 :         ret = decode_extradata_ps(data, size, ps, 0, logctx);
     490         205 :         if (ret < 0)
     491           0 :             return ret;
     492             :     }
     493         310 :     return size;
     494             : }
     495             : 
     496             : /**
     497             :  * Compute profile from profile_idc and constraint_set?_flags.
     498             :  *
     499             :  * @param sps SPS
     500             :  *
     501             :  * @return profile as defined by FF_PROFILE_H264_*
     502             :  */
     503       50221 : int ff_h264_get_profile(const SPS *sps)
     504             : {
     505       50221 :     int profile = sps->profile_idc;
     506             : 
     507       50221 :     switch (sps->profile_idc) {
     508       13801 :     case FF_PROFILE_H264_BASELINE:
     509             :         // constraint_set1_flag set to 1
     510       13801 :         profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0;
     511       13801 :         break;
     512        1653 :     case FF_PROFILE_H264_HIGH_10:
     513             :     case FF_PROFILE_H264_HIGH_422:
     514             :     case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
     515             :         // constraint_set3_flag set to 1
     516        1653 :         profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0;
     517        1653 :         break;
     518             :     }
     519             : 
     520       50221 :     return profile;
     521             : }

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