LCOV - code coverage report
Current view: top level - src/libavcodec - avs.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 80 91 87.9 %
Date: 2017-07-24 01:16:58 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * AVS video decoder.
       3             :  * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
       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 "avcodec.h"
      23             : #include "get_bits.h"
      24             : #include "internal.h"
      25             : 
      26             : typedef struct AvsContext {
      27             :     AVFrame *frame;
      28             : } AvsContext;
      29             : 
      30             : typedef enum {
      31             :     AVS_VIDEO     = 0x01,
      32             :     AVS_AUDIO     = 0x02,
      33             :     AVS_PALETTE   = 0x03,
      34             :     AVS_GAME_DATA = 0x04,
      35             : } AvsBlockType;
      36             : 
      37             : typedef enum {
      38             :     AVS_I_FRAME     = 0x00,
      39             :     AVS_P_FRAME_3X3 = 0x01,
      40             :     AVS_P_FRAME_2X2 = 0x02,
      41             :     AVS_P_FRAME_2X3 = 0x03,
      42             : } AvsVideoSubType;
      43             : 
      44             : 
      45             : static int
      46          56 : avs_decode_frame(AVCodecContext * avctx,
      47             :                  void *data, int *got_frame, AVPacket *avpkt)
      48             : {
      49          56 :     const uint8_t *buf = avpkt->data;
      50          56 :     const uint8_t *buf_end = avpkt->data + avpkt->size;
      51          56 :     int buf_size = avpkt->size;
      52          56 :     AvsContext *const avs = avctx->priv_data;
      53          56 :     AVFrame *picture = data;
      54          56 :     AVFrame *const p =  avs->frame;
      55             :     const uint8_t *table, *vect;
      56             :     uint8_t *out;
      57          56 :     int i, j, x, y, stride, ret, vect_w = 3, vect_h = 3;
      58             :     AvsVideoSubType sub_type;
      59             :     AvsBlockType type;
      60          56 :     GetBitContext change_map = {0}; //init to silence warning
      61             : 
      62          56 :     if ((ret = ff_reget_buffer(avctx, p)) < 0)
      63           0 :         return ret;
      64          56 :     p->pict_type = AV_PICTURE_TYPE_P;
      65          56 :     p->key_frame = 0;
      66             : 
      67          56 :     out    = p->data[0];
      68          56 :     stride = p->linesize[0];
      69             : 
      70          56 :     if (buf_end - buf < 4)
      71           0 :         return AVERROR_INVALIDDATA;
      72          56 :     sub_type = buf[0];
      73          56 :     type = buf[1];
      74          56 :     buf += 4;
      75             : 
      76          56 :     if (type == AVS_PALETTE) {
      77             :         int first, last;
      78           1 :         uint32_t *pal = (uint32_t *) p->data[1];
      79             : 
      80           1 :         first = AV_RL16(buf);
      81           1 :         last = first + AV_RL16(buf + 2);
      82           1 :         if (first >= 256 || last > 256 || buf_end - buf < 4 + 4 + 3 * (last - first))
      83           0 :             return AVERROR_INVALIDDATA;
      84           1 :         buf += 4;
      85         120 :         for (i=first; i<last; i++, buf+=3) {
      86         119 :             pal[i] = (buf[0] << 18) | (buf[1] << 10) | (buf[2] << 2);
      87         119 :             pal[i] |= 0xFFU << 24 | (pal[i] >> 6) & 0x30303;
      88             :         }
      89             : 
      90           1 :         sub_type = buf[0];
      91           1 :         type = buf[1];
      92           1 :         buf += 4;
      93             :     }
      94             : 
      95          56 :     if (type != AVS_VIDEO)
      96           0 :         return AVERROR_INVALIDDATA;
      97             : 
      98          56 :     switch (sub_type) {
      99           5 :     case AVS_I_FRAME:
     100           5 :         p->pict_type = AV_PICTURE_TYPE_I;
     101           5 :         p->key_frame = 1;
     102          14 :     case AVS_P_FRAME_3X3:
     103          14 :         vect_w = 3;
     104          14 :         vect_h = 3;
     105          14 :         break;
     106             : 
     107           5 :     case AVS_P_FRAME_2X2:
     108           5 :         vect_w = 2;
     109           5 :         vect_h = 2;
     110           5 :         break;
     111             : 
     112          37 :     case AVS_P_FRAME_2X3:
     113          37 :         vect_w = 2;
     114          37 :         vect_h = 3;
     115          37 :         break;
     116             : 
     117           0 :     default:
     118           0 :       return AVERROR_INVALIDDATA;
     119             :     }
     120             : 
     121          56 :     if (buf_end - buf < 256 * vect_w * vect_h)
     122           0 :         return AVERROR_INVALIDDATA;
     123          56 :     table = buf + (256 * vect_w * vect_h);
     124          56 :     if (sub_type != AVS_I_FRAME) {
     125          51 :         int map_size = ((318 / vect_w + 7) / 8) * (198 / vect_h);
     126          51 :         if (buf_end - table < map_size)
     127           0 :             return AVERROR_INVALIDDATA;
     128          51 :         init_get_bits(&change_map, table, map_size * 8);
     129          51 :         table += map_size;
     130             :     }
     131             : 
     132        3917 :     for (y=0; y<198; y+=vect_h) {
     133      568788 :         for (x=0; x<318; x+=vect_w) {
     134      564927 :             if (sub_type == AVS_I_FRAME || get_bits1(&change_map)) {
     135      271490 :                 if (buf_end - table < 1)
     136           0 :                     return AVERROR_INVALIDDATA;
     137      271490 :                 vect = &buf[*table++ * (vect_w * vect_h)];
     138      890084 :                 for (j=0; j<vect_w; j++) {
     139      618594 :                     out[(y + 0) * stride + x + j] = vect[(0 * vect_w) + j];
     140      618594 :                     out[(y + 1) * stride + x + j] = vect[(1 * vect_w) + j];
     141      618594 :                     if (vect_h == 3)
     142     1136228 :                         out[(y + 2) * stride + x + j] =
     143     1136228 :                             vect[(2 * vect_w) + j];
     144             :                 }
     145             :             }
     146             :         }
     147        3861 :         if (sub_type != AVS_I_FRAME)
     148        3531 :             align_get_bits(&change_map);
     149             :     }
     150             : 
     151          56 :     if ((ret = av_frame_ref(picture, p)) < 0)
     152           0 :         return ret;
     153          56 :     *got_frame = 1;
     154             : 
     155          56 :     return buf_size;
     156             : }
     157             : 
     158           2 : static av_cold int avs_decode_init(AVCodecContext * avctx)
     159             : {
     160           2 :     AvsContext *s = avctx->priv_data;
     161             : 
     162           2 :     s->frame = av_frame_alloc();
     163           2 :     if (!s->frame)
     164           0 :         return AVERROR(ENOMEM);
     165             : 
     166           2 :     avctx->pix_fmt = AV_PIX_FMT_PAL8;
     167             : 
     168           2 :     return ff_set_dimensions(avctx, 318, 198);
     169             : }
     170             : 
     171           2 : static av_cold int avs_decode_end(AVCodecContext *avctx)
     172             : {
     173           2 :     AvsContext *s = avctx->priv_data;
     174           2 :     av_frame_free(&s->frame);
     175           2 :     return 0;
     176             : }
     177             : 
     178             : 
     179             : AVCodec ff_avs_decoder = {
     180             :     .name           = "avs",
     181             :     .long_name      = NULL_IF_CONFIG_SMALL("AVS (Audio Video Standard) video"),
     182             :     .type           = AVMEDIA_TYPE_VIDEO,
     183             :     .id             = AV_CODEC_ID_AVS,
     184             :     .priv_data_size = sizeof(AvsContext),
     185             :     .init           = avs_decode_init,
     186             :     .decode         = avs_decode_frame,
     187             :     .close          = avs_decode_end,
     188             :     .capabilities   = AV_CODEC_CAP_DR1,
     189             :     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
     190             : };

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