LCOV - code coverage report
Current view: top level - src/libavcodec - aliaspixdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 40 52 76.9 %
Date: 2017-01-24 04:42:20 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Alias PIX image decoder
       3             :  * Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
       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             : #include "libavutil/intreadwrite.h"
      23             : 
      24             : #include "avcodec.h"
      25             : #include "bytestream.h"
      26             : #include "internal.h"
      27             : 
      28             : #define ALIAS_HEADER_SIZE 10
      29             : 
      30           4 : static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
      31             :                         AVPacket *avpkt)
      32             : {
      33           4 :     AVFrame *f = data;
      34             :     GetByteContext gb;
      35             :     int width, height, ret, bits_pixel, pixel;
      36             :     uint8_t *out_buf;
      37             :     uint8_t count;
      38             :     int x, y;
      39             : 
      40           4 :     bytestream2_init(&gb, avpkt->data, avpkt->size);
      41             : 
      42           4 :     if (bytestream2_get_bytes_left(&gb) < ALIAS_HEADER_SIZE) {
      43           0 :         av_log(avctx, AV_LOG_ERROR, "Header too small %d.\n", avpkt->size);
      44           0 :         return AVERROR_INVALIDDATA;
      45             :     }
      46             : 
      47           4 :     width  = bytestream2_get_be16u(&gb);
      48           4 :     height = bytestream2_get_be16u(&gb);
      49           4 :     bytestream2_skipu(&gb, 4); // obsolete X, Y offset
      50           4 :     bits_pixel = bytestream2_get_be16u(&gb);
      51             : 
      52           4 :     if (bits_pixel == 24)
      53           2 :         avctx->pix_fmt = AV_PIX_FMT_BGR24;
      54           2 :     else if (bits_pixel == 8)
      55           2 :         avctx->pix_fmt = AV_PIX_FMT_GRAY8;
      56             :     else {
      57           0 :         av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n");
      58           0 :         return AVERROR_INVALIDDATA;
      59             :     }
      60             : 
      61           4 :     ret = ff_set_dimensions(avctx, width, height);
      62           4 :     if (ret < 0)
      63           0 :         return ret;
      64             : 
      65           4 :     ret = ff_get_buffer(avctx, f, 0);
      66           4 :     if (ret < 0)
      67           0 :         return ret;
      68             : 
      69           4 :     f->pict_type = AV_PICTURE_TYPE_I;
      70           4 :     f->key_frame = 1;
      71             : 
      72           4 :     x = 0;
      73           4 :     y = 1;
      74           4 :     out_buf = f->data[0];
      75       60406 :     while (bytestream2_get_bytes_left(&gb) > 0) {
      76             :         int i;
      77             : 
      78             :         /* set buffer at the right position at every new line */
      79       60398 :         if (x == avctx->width) {
      80         316 :             x = 0;
      81         316 :             out_buf = f->data[0] + f->linesize[0] * y++;
      82         316 :             if (y > avctx->height) {
      83           0 :                 av_log(avctx, AV_LOG_ERROR,
      84             :                        "Ended frame decoding with %d bytes left.\n",
      85             :                        bytestream2_get_bytes_left(&gb));
      86           0 :                 return AVERROR_INVALIDDATA;
      87             :             }
      88             :         }
      89             : 
      90             :         /* read packet and copy data */
      91       60398 :         count = bytestream2_get_byteu(&gb);
      92       60398 :         if (!count || x + count > avctx->width) {
      93           0 :             av_log(avctx, AV_LOG_ERROR, "Invalid run length %d.\n", count);
      94           0 :             return AVERROR_INVALIDDATA;
      95             :         }
      96             : 
      97       60398 :         if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
      98       31540 :             pixel = bytestream2_get_be24(&gb);
      99       63298 :             for (i = 0; i < count; i++) {
     100       31758 :                 AV_WB24(out_buf, pixel);
     101       31758 :                 out_buf += 3;
     102             :             }
     103             :         } else { // AV_PIX_FMT_GRAY8
     104       28858 :             pixel = bytestream2_get_byte(&gb);
     105       61096 :             for (i = 0; i < count; i++)
     106       32238 :                 *out_buf++ = pixel;
     107             :         }
     108             : 
     109       60398 :         x += i;
     110             :     }
     111             : 
     112           4 :     if (x != width || y != height) {
     113           0 :         av_log(avctx, AV_LOG_ERROR, "Picture stopped at %d,%d.\n", x, y);
     114           0 :         return AVERROR_INVALIDDATA;
     115             :     }
     116             : 
     117           4 :     *got_frame = 1;
     118           4 :     return avpkt->size;
     119             : }
     120             : 
     121             : AVCodec ff_alias_pix_decoder = {
     122             :     .name         = "alias_pix",
     123             :     .long_name    = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
     124             :     .type         = AVMEDIA_TYPE_VIDEO,
     125             :     .id           = AV_CODEC_ID_ALIAS_PIX,
     126             :     .decode       = decode_frame,
     127             :     .capabilities = AV_CODEC_CAP_DR1,
     128             : };

Generated by: LCOV version 1.12