LCOV - code coverage report
Current view: top level - libavcodec - intelh263dec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 71 0.0 %
Date: 2017-12-13 18:07:29 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /*
       2             :  * H.263i decoder
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : #include "mpegutils.h"
      22             : #include "mpegvideo.h"
      23             : #include "h263.h"
      24             : #include "mpegvideodata.h"
      25             : 
      26             : /* don't understand why they choose a different header ! */
      27           0 : int ff_intel_h263_decode_picture_header(MpegEncContext *s)
      28             : {
      29             :     int format;
      30             : 
      31           0 :     if (get_bits_left(&s->gb) == 64) { /* special dummy frames */
      32           0 :         return FRAME_SKIPPED;
      33             :     }
      34             : 
      35             :     /* picture header */
      36           0 :     if (get_bits_long(&s->gb, 22) != 0x20) {
      37           0 :         av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
      38           0 :         return -1;
      39             :     }
      40           0 :     s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
      41             : 
      42           0 :     if (check_marker(s->avctx, &s->gb, "after picture_number") != 1) {
      43           0 :         return -1;      /* marker */
      44             :     }
      45           0 :     if (get_bits1(&s->gb) != 0) {
      46           0 :         av_log(s->avctx, AV_LOG_ERROR, "Bad H.263 id\n");
      47           0 :         return -1;      /* H.263 id */
      48             :     }
      49           0 :     skip_bits1(&s->gb);         /* split screen off */
      50           0 :     skip_bits1(&s->gb);         /* camera  off */
      51           0 :     skip_bits1(&s->gb);         /* freeze picture release off */
      52             : 
      53           0 :     format = get_bits(&s->gb, 3);
      54           0 :     if (format == 0 || format == 6) {
      55           0 :         av_log(s->avctx, AV_LOG_ERROR, "Intel H.263 free format not supported\n");
      56           0 :         return -1;
      57             :     }
      58           0 :     s->h263_plus = 0;
      59             : 
      60           0 :     s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
      61             : 
      62           0 :     s->h263_long_vectors = get_bits1(&s->gb);
      63             : 
      64           0 :     if (get_bits1(&s->gb) != 0) {
      65           0 :         av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n");
      66           0 :         return -1;      /* SAC: off */
      67             :     }
      68           0 :     s->obmc= get_bits1(&s->gb);
      69           0 :     s->unrestricted_mv = s->obmc || s->h263_long_vectors;
      70           0 :     s->pb_frame = get_bits1(&s->gb);
      71             : 
      72           0 :     if (format < 6) {
      73           0 :         s->width = ff_h263_format[format][0];
      74           0 :         s->height = ff_h263_format[format][1];
      75           0 :         s->avctx->sample_aspect_ratio.num = 12;
      76           0 :         s->avctx->sample_aspect_ratio.den = 11;
      77             :     } else {
      78           0 :         format = get_bits(&s->gb, 3);
      79           0 :         if(format == 0 || format == 7){
      80           0 :             av_log(s->avctx, AV_LOG_ERROR, "Wrong Intel H.263 format\n");
      81           0 :             return -1;
      82             :         }
      83           0 :         if(get_bits(&s->gb, 2))
      84           0 :             av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
      85           0 :         s->loop_filter = get_bits1(&s->gb) * !s->avctx->lowres;
      86           0 :         if(get_bits1(&s->gb))
      87           0 :             av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
      88           0 :         if(get_bits1(&s->gb))
      89           0 :             s->pb_frame = 2;
      90           0 :         if(get_bits(&s->gb, 5))
      91           0 :             av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
      92           0 :         if(get_bits(&s->gb, 5) != 1)
      93           0 :             av_log(s->avctx, AV_LOG_ERROR, "Invalid marker\n");
      94             :     }
      95           0 :     if(format == 6){
      96           0 :         int ar = get_bits(&s->gb, 4);
      97           0 :         skip_bits(&s->gb, 9); // display width
      98           0 :         check_marker(s->avctx, &s->gb, "in dimensions");
      99           0 :         skip_bits(&s->gb, 9); // display height
     100           0 :         if(ar == 15){
     101           0 :             s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 8); // aspect ratio - width
     102           0 :             s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 8); // aspect ratio - height
     103             :         } else {
     104           0 :             s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[ar];
     105             :         }
     106           0 :         if (s->avctx->sample_aspect_ratio.num == 0)
     107           0 :             av_log(s->avctx, AV_LOG_ERROR, "Invalid aspect ratio.\n");
     108             :     }
     109             : 
     110           0 :     s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
     111           0 :     skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
     112             : 
     113           0 :     if(s->pb_frame){
     114           0 :         skip_bits(&s->gb, 3); //temporal reference for B-frame
     115           0 :         skip_bits(&s->gb, 2); //dbquant
     116             :     }
     117             : 
     118             :     /* PEI */
     119           0 :     if (skip_1stop_8data_bits(&s->gb) < 0)
     120           0 :         return AVERROR_INVALIDDATA;
     121           0 :     s->f_code = 1;
     122             : 
     123           0 :     s->y_dc_scale_table=
     124           0 :     s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
     125             : 
     126           0 :     ff_h263_show_pict_info(s);
     127             : 
     128           0 :     return 0;
     129             : }
     130             : 
     131             : AVCodec ff_h263i_decoder = {
     132             :     .name           = "h263i",
     133             :     .long_name      = NULL_IF_CONFIG_SMALL("Intel H.263"),
     134             :     .type           = AVMEDIA_TYPE_VIDEO,
     135             :     .id             = AV_CODEC_ID_H263I,
     136             :     .priv_data_size = sizeof(MpegEncContext),
     137             :     .init           = ff_h263_decode_init,
     138             :     .close          = ff_h263_decode_end,
     139             :     .decode         = ff_h263_decode_frame,
     140             :     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
     141             :     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
     142             :     .pix_fmts       = (const enum AVPixelFormat[]) {
     143             :         AV_PIX_FMT_YUV420P,
     144             :         AV_PIX_FMT_NONE
     145             :     },
     146             : };

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