LCOV - code coverage report
Current view: top level - libavcodec - xl.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 52 57 91.2 %
Date: 2017-12-18 06:23:41 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Miro VideoXL codec
       3             :  * Copyright (c) 2004 Konstantin Shishkov
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg 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             :  * FFmpeg 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 FFmpeg; 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             :  * Miro VideoXL codec.
      25             :  */
      26             : 
      27             : #include "libavutil/common.h"
      28             : #include "libavutil/intreadwrite.h"
      29             : #include "avcodec.h"
      30             : #include "internal.h"
      31             : 
      32             : static const int xl_table[32] = {
      33             :    0,   1,   2,   3,   4,   5,   6,   7,
      34             :    8,   9,  12,  15,  20,  25,  34,  46,
      35             :   64,  82,  94, 103, 108, 113, 116, 119,
      36             :  120, 121, 122, 123, 124, 125, 126, 127
      37             : };
      38             : 
      39          40 : static int decode_frame(AVCodecContext *avctx,
      40             :                         void *data, int *got_frame,
      41             :                         AVPacket *avpkt)
      42             : {
      43          40 :     const uint8_t *buf = avpkt->data;
      44          40 :     int buf_size       = avpkt->size;
      45          40 :     AVFrame *const p   = data;
      46             :     uint8_t *Y, *U, *V;
      47             :     int i, j, ret;
      48             :     int stride;
      49             :     uint32_t val;
      50          40 :     int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
      51             : 
      52          40 :     if (avctx->width % 4) {
      53           0 :         av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n");
      54           0 :         return AVERROR_INVALIDDATA;
      55             :     }
      56          40 :     if (buf_size < avctx->width * avctx->height) {
      57           0 :         av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
      58           0 :         return AVERROR_INVALIDDATA;
      59             :     }
      60             : 
      61          40 :     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
      62           0 :         return ret;
      63          40 :     p->pict_type = AV_PICTURE_TYPE_I;
      64          40 :     p->key_frame = 1;
      65             : 
      66          40 :     Y = p->data[0];
      67          40 :     U = p->data[1];
      68          40 :     V = p->data[2];
      69             : 
      70          40 :     stride = avctx->width - 4;
      71             : 
      72        5160 :     for (i = 0; i < avctx->height; i++) {
      73             :         /* lines are stored in reversed order */
      74        5120 :         buf += stride;
      75             : 
      76      245760 :         for (j = 0; j < avctx->width; j += 4) {
      77             :             /* value is stored in LE dword with word swapped */
      78      240640 :             val  = AV_RL32(buf);
      79      240640 :             buf -= 4;
      80      240640 :             val  = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
      81             : 
      82      240640 :             if (!j)
      83        5120 :                 y0 = (val & 0x1F) << 2;
      84             :             else
      85      235520 :                 y0 = y3 + xl_table[val & 0x1F];
      86      240640 :             val >>= 5;
      87      240640 :             y1    = y0 + xl_table[val & 0x1F];
      88      240640 :             val >>= 5;
      89      240640 :             y2    = y1 + xl_table[val & 0x1F];
      90      240640 :             val >>= 6; /* align to word */
      91      240640 :             y3    = y2 + xl_table[val & 0x1F];
      92      240640 :             val >>= 5;
      93      240640 :             if (!j)
      94        5120 :                 c0 = (val & 0x1F) << 2;
      95             :             else
      96      235520 :                 c0 += xl_table[val & 0x1F];
      97      240640 :             val >>= 5;
      98      240640 :             if (!j)
      99        5120 :                 c1 = (val & 0x1F) << 2;
     100             :             else
     101      235520 :                 c1 += xl_table[val & 0x1F];
     102             : 
     103      240640 :             Y[j + 0] = y0 << 1;
     104      240640 :             Y[j + 1] = y1 << 1;
     105      240640 :             Y[j + 2] = y2 << 1;
     106      240640 :             Y[j + 3] = y3 << 1;
     107             : 
     108      240640 :             U[j >> 2] = c0 << 1;
     109      240640 :             V[j >> 2] = c1 << 1;
     110             :         }
     111             : 
     112        5120 :         buf += avctx->width + 4;
     113        5120 :         Y   += p->linesize[0];
     114        5120 :         U   += p->linesize[1];
     115        5120 :         V   += p->linesize[2];
     116             :     }
     117             : 
     118          40 :     *got_frame = 1;
     119             : 
     120          40 :     return buf_size;
     121             : }
     122             : 
     123           2 : static av_cold int decode_init(AVCodecContext *avctx)
     124             : {
     125           2 :     avctx->pix_fmt = AV_PIX_FMT_YUV411P;
     126             : 
     127           2 :     return 0;
     128             : }
     129             : 
     130             : AVCodec ff_xl_decoder = {
     131             :     .name         = "xl",
     132             :     .long_name    = NULL_IF_CONFIG_SMALL("Miro VideoXL"),
     133             :     .type         = AVMEDIA_TYPE_VIDEO,
     134             :     .id           = AV_CODEC_ID_VIXL,
     135             :     .init         = decode_init,
     136             :     .decode       = decode_frame,
     137             :     .capabilities = AV_CODEC_CAP_DR1,
     138             : };

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