LCOV - code coverage report
Current view: top level - src/libavcodec - aura.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 35 40 87.5 %
Date: 2017-01-24 04:42:20 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Aura 2 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             : /**
      22             :  * @file
      23             :  * Aura 2 decoder
      24             :  */
      25             : 
      26             : #include "avcodec.h"
      27             : #include "internal.h"
      28             : #include "libavutil/internal.h"
      29             : 
      30           2 : static av_cold int aura_decode_init(AVCodecContext *avctx)
      31             : {
      32             :     /* width needs to be divisible by 4 for this codec to work */
      33           2 :     if (avctx->width & 0x3)
      34           0 :         return AVERROR(EINVAL);
      35           2 :     avctx->pix_fmt = AV_PIX_FMT_YUV422P;
      36             : 
      37           2 :     return 0;
      38             : }
      39             : 
      40           2 : static int aura_decode_frame(AVCodecContext *avctx,
      41             :                              void *data, int *got_frame,
      42             :                              AVPacket *pkt)
      43             : {
      44           2 :     AVFrame *frame = data;
      45             :     uint8_t *Y, *U, *V;
      46             :     uint8_t val;
      47             :     int x, y, ret;
      48           2 :     const uint8_t *buf = pkt->data;
      49             : 
      50             :     /* prediction error tables (make it clear that they are signed values) */
      51           2 :     const int8_t *delta_table = (const int8_t*)buf + 16;
      52             : 
      53           2 :     if (pkt->size != 48 + avctx->height * avctx->width) {
      54           0 :         av_log(avctx, AV_LOG_ERROR, "got a buffer with %d bytes when %d were expected\n",
      55           0 :                pkt->size, 48 + avctx->height * avctx->width);
      56           0 :         return AVERROR_INVALIDDATA;
      57             :     }
      58             : 
      59             :     /* pixel data starts 48 bytes in, after 3x16-byte tables */
      60           2 :     buf += 48;
      61             : 
      62           2 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
      63           0 :         return ret;
      64             : 
      65           2 :     Y = frame->data[0];
      66           2 :     U = frame->data[1];
      67           2 :     V = frame->data[2];
      68             : 
      69             :     /* iterate through each line in the height */
      70         362 :     for (y = 0; y < avctx->height; y++) {
      71             :         /* reset predictors */
      72         360 :         val  = *buf++;
      73         360 :         U[0] = val & 0xF0;
      74         360 :         Y[0] = val << 4;
      75         360 :         val  = *buf++;
      76         360 :         V[0] = val & 0xF0;
      77         360 :         Y[1] = Y[0] + delta_table[val & 0xF];
      78         360 :         Y   += 2; U++; V++;
      79             : 
      80             :         /* iterate through the remaining pixel groups (4 pixels/group) */
      81       57600 :         for (x = 1; x < (avctx->width >> 1); x++) {
      82       57240 :             val  = *buf++;
      83       57240 :             U[0] = U[-1] + delta_table[val >> 4];
      84       57240 :             Y[0] = Y[-1] + delta_table[val & 0xF];
      85       57240 :             val  = *buf++;
      86       57240 :             V[0] = V[-1] + delta_table[val >> 4];
      87       57240 :             Y[1] = Y[ 0] + delta_table[val & 0xF];
      88       57240 :             Y   += 2; U++; V++;
      89             :         }
      90         360 :         Y += frame->linesize[0] -  avctx->width;
      91         360 :         U += frame->linesize[1] - (avctx->width >> 1);
      92         360 :         V += frame->linesize[2] - (avctx->width >> 1);
      93             :     }
      94             : 
      95           2 :     *got_frame = 1;
      96             : 
      97           2 :     return pkt->size;
      98             : }
      99             : 
     100             : AVCodec ff_aura2_decoder = {
     101             :     .name           = "aura2",
     102             :     .long_name      = NULL_IF_CONFIG_SMALL("Auravision Aura 2"),
     103             :     .type           = AVMEDIA_TYPE_VIDEO,
     104             :     .id             = AV_CODEC_ID_AURA2,
     105             :     .init           = aura_decode_init,
     106             :     .decode         = aura_decode_frame,
     107             :     .capabilities   = AV_CODEC_CAP_DR1,
     108             : };

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