LCOV - code coverage report
Current view: top level - libavcodec - flvdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 37 67 55.2 %
Date: 2017-12-16 13:57:32 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * FLV decoding.
       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 "libavutil/imgutils.h"
      22             : 
      23             : #include "flv.h"
      24             : #include "h263.h"
      25             : #include "mpegvideo.h"
      26             : #include "mpegvideodata.h"
      27             : 
      28         414 : int ff_flv_decode_picture_header(MpegEncContext *s)
      29             : {
      30             :     int format, width, height;
      31             : 
      32             :     /* picture header */
      33         414 :     if (get_bits_long(&s->gb, 17) != 1) {
      34           0 :         av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
      35           0 :         return AVERROR_INVALIDDATA;
      36             :     }
      37         414 :     format = get_bits(&s->gb, 5);
      38         414 :     if (format != 0 && format != 1) {
      39           0 :         av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
      40           0 :         return AVERROR_INVALIDDATA;
      41             :     }
      42         414 :     s->h263_flv       = format + 1;
      43         414 :     s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
      44         414 :     format            = get_bits(&s->gb, 3);
      45         414 :     switch (format) {
      46          51 :     case 0:
      47          51 :         width  = get_bits(&s->gb, 8);
      48          51 :         height = get_bits(&s->gb, 8);
      49          51 :         break;
      50           0 :     case 1:
      51           0 :         width  = get_bits(&s->gb, 16);
      52           0 :         height = get_bits(&s->gb, 16);
      53           0 :         break;
      54         362 :     case 2:
      55         362 :         width  = 352;
      56         362 :         height = 288;
      57         362 :         break;
      58           0 :     case 3:
      59           0 :         width  = 176;
      60           0 :         height = 144;
      61           0 :         break;
      62           0 :     case 4:
      63           0 :         width  = 128;
      64           0 :         height = 96;
      65           0 :         break;
      66           1 :     case 5:
      67           1 :         width  = 320;
      68           1 :         height = 240;
      69           1 :         break;
      70           0 :     case 6:
      71           0 :         width  = 160;
      72           0 :         height = 120;
      73           0 :         break;
      74           0 :     default:
      75           0 :         width = height = 0;
      76           0 :         break;
      77             :     }
      78         414 :     if (av_image_check_size(width, height, 0, s->avctx))
      79           0 :         return AVERROR(EINVAL);
      80         414 :     s->width  = width;
      81         414 :     s->height = height;
      82             : 
      83         414 :     s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2);
      84         414 :     s->droppable = s->pict_type > AV_PICTURE_TYPE_P;
      85         414 :     if (s->droppable)
      86           0 :         s->pict_type = AV_PICTURE_TYPE_P;
      87             : 
      88         414 :     skip_bits1(&s->gb); /* deblocking flag */
      89         414 :     s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
      90             : 
      91         414 :     s->h263_plus = 0;
      92             : 
      93         414 :     s->unrestricted_mv   = 1;
      94         414 :     s->h263_long_vectors = 0;
      95             : 
      96             :     /* PEI */
      97         414 :     if (skip_1stop_8data_bits(&s->gb) < 0)
      98           0 :         return AVERROR_INVALIDDATA;
      99             : 
     100         414 :     s->f_code = 1;
     101             : 
     102         414 :     if (s->ehc_mode)
     103           0 :         s->avctx->sample_aspect_ratio= (AVRational){1,2};
     104             : 
     105         414 :     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
     106           0 :         av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
     107           0 :                s->droppable ? 'D' : av_get_picture_type_char(s->pict_type),
     108           0 :                s->h263_flv - 1, s->qscale, s->picture_number);
     109             :     }
     110             : 
     111         414 :     s->y_dc_scale_table = s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
     112             : 
     113         414 :     return 0;
     114             : }
     115             : 
     116             : AVCodec ff_flv_decoder = {
     117             :     .name           = "flv",
     118             :     .long_name      = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
     119             :     .type           = AVMEDIA_TYPE_VIDEO,
     120             :     .id             = AV_CODEC_ID_FLV1,
     121             :     .priv_data_size = sizeof(MpegEncContext),
     122             :     .init           = ff_h263_decode_init,
     123             :     .close          = ff_h263_decode_end,
     124             :     .decode         = ff_h263_decode_frame,
     125             :     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
     126             :     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
     127             :     .max_lowres     = 3,
     128             :     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
     129             :                                                      AV_PIX_FMT_NONE },
     130             : };

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