LCOV - code coverage report
Current view: top level - libavcodec - vb.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 124 143 86.7 %
Date: 2017-12-18 06:23:41 Functions: 7 7 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Beam Software VB decoder
       3             :  * Copyright (c) 2007 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             :  * VB Video decoder
      25             :  */
      26             : 
      27             : #include <stdio.h>
      28             : #include <stdlib.h>
      29             : 
      30             : #include "avcodec.h"
      31             : #include "bytestream.h"
      32             : #include "internal.h"
      33             : 
      34             : enum VBFlags {
      35             :     VB_HAS_GMC     = 0x01,
      36             :     VB_HAS_AUDIO   = 0x04,
      37             :     VB_HAS_VIDEO   = 0x08,
      38             :     VB_HAS_PALETTE = 0x10,
      39             :     VB_HAS_LENGTH  = 0x20
      40             : };
      41             : 
      42             : typedef struct VBDecContext {
      43             :     AVCodecContext *avctx;
      44             : 
      45             :     uint8_t *frame, *prev_frame;
      46             :     uint32_t pal[AVPALETTE_COUNT];
      47             :     GetByteContext stream;
      48             : } VBDecContext;
      49             : 
      50             : static const uint16_t vb_patterns[64] = {
      51             :     0x0660, 0xFF00, 0xCCCC, 0xF000, 0x8888, 0x000F, 0x1111, 0xFEC8,
      52             :     0x8CEF, 0x137F, 0xF731, 0xC800, 0x008C, 0x0013, 0x3100, 0xCC00,
      53             :     0x00CC, 0x0033, 0x3300, 0x0FF0, 0x6666, 0x00F0, 0x0F00, 0x2222,
      54             :     0x4444, 0xF600, 0x8CC8, 0x006F, 0x1331, 0x318C, 0xC813, 0x33CC,
      55             :     0x6600, 0x0CC0, 0x0066, 0x0330, 0xF900, 0xC88C, 0x009F, 0x3113,
      56             :     0x6000, 0x0880, 0x0006, 0x0110, 0xCC88, 0xFC00, 0x00CF, 0x88CC,
      57             :     0x003F, 0x1133, 0x3311, 0xF300, 0x6FF6, 0x0603, 0x08C6, 0x8C63,
      58             :     0xC631, 0x6310, 0xC060, 0x0136, 0x136C, 0x36C8, 0x6C80, 0x324C
      59             : };
      60             : 
      61           1 : static void vb_decode_palette(VBDecContext *c, int data_size)
      62             : {
      63             :     int start, size, i;
      64             : 
      65           1 :     start = bytestream2_get_byte(&c->stream);
      66           1 :     size  = (bytestream2_get_byte(&c->stream) - 1) & 0xFF;
      67           1 :     if (start + size > 255) {
      68           0 :         av_log(c->avctx, AV_LOG_ERROR, "Palette change runs beyond entry 256\n");
      69           0 :         return;
      70             :     }
      71           1 :     if (size*3+2 > data_size) {
      72           0 :         av_log(c->avctx, AV_LOG_ERROR, "Palette data runs beyond chunk size\n");
      73           0 :         return;
      74             :     }
      75         237 :     for (i = start; i <= start + size; i++)
      76         236 :         c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&c->stream);
      77             : }
      78             : 
      79       67819 : static inline int check_pixel(uint8_t *buf, uint8_t *start, uint8_t *end)
      80             : {
      81       67819 :     return buf >= start && buf < end;
      82             : }
      83             : 
      84      369468 : static inline int check_line(uint8_t *buf, uint8_t *start, uint8_t *end)
      85             : {
      86      369468 :     return buf >= start && (buf + 4) <= end;
      87             : }
      88             : 
      89          37 : static int vb_decode_framedata(VBDecContext *c, int offset)
      90             : {
      91             :     GetByteContext g;
      92             :     uint8_t *prev, *cur;
      93             :     int blk, blocks, t, blk2;
      94          37 :     int blocktypes = 0;
      95             :     int x, y, a, b;
      96             :     int pattype, pattern;
      97          37 :     const int width = c->avctx->width;
      98          37 :     uint8_t *pstart = c->prev_frame;
      99          37 :     uint8_t *pend   = c->prev_frame + width*c->avctx->height;
     100             : 
     101          37 :     g = c->stream;
     102             : 
     103          37 :     prev = c->prev_frame + offset;
     104          37 :     cur  = c->frame;
     105             : 
     106          37 :     blocks = (c->avctx->width >> 2) * (c->avctx->height >> 2);
     107          37 :     blk2   = 0;
     108      177637 :     for (blk = 0; blk < blocks; blk++) {
     109      177600 :         if (!(blk & 3)) {
     110       44400 :             blocktypes = bytestream2_get_byte(&g);
     111             :         }
     112      177600 :         switch (blocktypes & 0xC0) {
     113       14413 :         case 0x00: //skip
     114       72065 :             for (y = 0; y < 4; y++)
     115       57652 :                 if (check_line(prev + y*width, pstart, pend))
     116       57652 :                     memcpy(cur + y*width, prev + y*width, 4);
     117             :                 else
     118           0 :                     memset(cur + y*width, 0, 4);
     119       14413 :             break;
     120       93230 :         case 0x40:
     121       93230 :             t = bytestream2_get_byte(&g);
     122       93230 :             if (!t) { //raw block
     123       15276 :                 if (bytestream2_get_bytes_left(&g) < 16) {
     124           0 :                     av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
     125           0 :                     return AVERROR_INVALIDDATA;
     126             :                 }
     127       76380 :                 for (y = 0; y < 4; y++)
     128       61104 :                     bytestream2_get_buffer(&g, cur + y * width, 4);
     129             :             } else { // motion compensation
     130       77954 :                 x = ((t & 0xF)^8) - 8;
     131       77954 :                 y = ((t >> 4) ^8) - 8;
     132       77954 :                 t = x + y*width;
     133      389770 :                 for (y = 0; y < 4; y++)
     134      311816 :                     if (check_line(prev + t + y*width, pstart, pend))
     135      311816 :                         memcpy(cur + y*width, prev + t + y*width, 4);
     136             :                     else
     137           0 :                         memset(cur + y*width, 0, 4);
     138             :             }
     139       93230 :             break;
     140       11328 :         case 0x80: // fill
     141       11328 :             t = bytestream2_get_byte(&g);
     142       56640 :             for (y = 0; y < 4; y++)
     143       45312 :                 memset(cur + y*width, t, 4);
     144       11328 :             break;
     145       58629 :         case 0xC0: // pattern fill
     146       58629 :             t       = bytestream2_get_byte(&g);
     147       58629 :             pattype = t >> 6;
     148       58629 :             pattern = vb_patterns[t & 0x3F];
     149       58629 :             switch (pattype) {
     150       51372 :             case 0:
     151       51372 :                 a = bytestream2_get_byte(&g);
     152       51372 :                 b = bytestream2_get_byte(&g);
     153      256860 :                 for (y = 0; y < 4; y++)
     154     1027440 :                     for (x = 0; x < 4; x++, pattern >>= 1)
     155      821952 :                         cur[x + y*width] = (pattern & 1) ? b : a;
     156       51372 :                 break;
     157        4746 :             case 1:
     158        4746 :                 pattern = ~pattern;
     159        7257 :             case 2:
     160        7257 :                 a = bytestream2_get_byte(&g);
     161       36285 :                 for (y = 0; y < 4; y++)
     162      145140 :                     for (x = 0; x < 4; x++, pattern >>= 1)
     163      116112 :                         if (pattern & 1 && check_pixel(prev + x + y*width, pstart, pend))
     164       67819 :                             cur[x + y*width] = prev[x + y*width];
     165             :                         else
     166       48293 :                             cur[x + y*width] = a;
     167        7257 :                 break;
     168           0 :             case 3:
     169           0 :                 av_log(c->avctx, AV_LOG_ERROR, "Invalid opcode seen @%d\n", blk);
     170           0 :                 return AVERROR_INVALIDDATA;
     171             :             }
     172       58629 :             break;
     173             :         }
     174      177600 :         blocktypes <<= 2;
     175      177600 :         cur  += 4;
     176      177600 :         prev += 4;
     177      177600 :         blk2++;
     178      177600 :         if (blk2 == (width >> 2)) {
     179        2220 :             blk2  = 0;
     180        2220 :             cur  += width * 3;
     181        2220 :             prev += width * 3;
     182             :         }
     183             :     }
     184          37 :     return 0;
     185             : }
     186             : 
     187          37 : static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     188             :                         AVPacket *avpkt)
     189             : {
     190          37 :     VBDecContext * const c = avctx->priv_data;
     191          37 :     AVFrame *frame         = data;
     192             :     uint8_t *outptr, *srcptr;
     193             :     int i, j, ret;
     194             :     int flags;
     195             :     uint32_t size;
     196          37 :     int offset = 0;
     197             : 
     198          37 :     bytestream2_init(&c->stream, avpkt->data, avpkt->size);
     199             : 
     200          37 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
     201           0 :         return ret;
     202             : 
     203          37 :     flags = bytestream2_get_le16(&c->stream);
     204             : 
     205          37 :     if (flags & VB_HAS_GMC) {
     206           8 :         i = (int16_t)bytestream2_get_le16(&c->stream);
     207           8 :         j = (int16_t)bytestream2_get_le16(&c->stream);
     208           8 :         if (FFABS(j) > avctx->height) {
     209           0 :             av_log(avctx, AV_LOG_ERROR, "GMV out of range\n");
     210           0 :             return AVERROR_INVALIDDATA;
     211             :         }
     212           8 :         offset = i + j * avctx->width;
     213             :     }
     214          37 :     if (flags & VB_HAS_VIDEO) {
     215          37 :         size = bytestream2_get_le32(&c->stream);
     216          37 :         if(size > bytestream2_get_bytes_left(&c->stream)+4 || size<4){
     217           0 :             av_log(avctx, AV_LOG_ERROR, "Frame size invalid\n");
     218           0 :             return -1;
     219             :         }
     220          37 :         vb_decode_framedata(c, offset);
     221          37 :         bytestream2_skip(&c->stream, size - 4);
     222             :     }
     223          37 :     if (flags & VB_HAS_PALETTE) {
     224           1 :         size = bytestream2_get_le32(&c->stream);
     225           1 :         vb_decode_palette(c, size);
     226             :     }
     227             : 
     228          37 :     memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
     229          37 :     frame->palette_has_changed = flags & VB_HAS_PALETTE;
     230             : 
     231          37 :     outptr = frame->data[0];
     232          37 :     srcptr = c->frame;
     233             : 
     234        8917 :     for (i = 0; i < avctx->height; i++) {
     235        8880 :         memcpy(outptr, srcptr, avctx->width);
     236        8880 :         srcptr += avctx->width;
     237        8880 :         outptr += frame->linesize[0];
     238             :     }
     239             : 
     240          37 :     FFSWAP(uint8_t*, c->frame, c->prev_frame);
     241             : 
     242          37 :     *got_frame = 1;
     243             : 
     244             :     /* always report that the buffer was completely consumed */
     245          37 :     return avpkt->size;
     246             : }
     247             : 
     248           3 : static av_cold int decode_init(AVCodecContext *avctx)
     249             : {
     250           3 :     VBDecContext * const c = avctx->priv_data;
     251             : 
     252           3 :     c->avctx       = avctx;
     253           3 :     avctx->pix_fmt = AV_PIX_FMT_PAL8;
     254             : 
     255           3 :     c->frame      = av_mallocz(avctx->width * avctx->height);
     256           3 :     c->prev_frame = av_mallocz(avctx->width * avctx->height);
     257             : 
     258           3 :     if (!c->frame || !c->prev_frame) {
     259           0 :         av_freep(&c->frame);
     260           0 :         av_freep(&c->prev_frame);
     261           0 :         return AVERROR(ENOMEM);
     262             :     }
     263             : 
     264           3 :     return 0;
     265             : }
     266             : 
     267           3 : static av_cold int decode_end(AVCodecContext *avctx)
     268             : {
     269           3 :     VBDecContext *c = avctx->priv_data;
     270             : 
     271           3 :     av_freep(&c->frame);
     272           3 :     av_freep(&c->prev_frame);
     273             : 
     274           3 :     return 0;
     275             : }
     276             : 
     277             : AVCodec ff_vb_decoder = {
     278             :     .name           = "vb",
     279             :     .long_name      = NULL_IF_CONFIG_SMALL("Beam Software VB"),
     280             :     .type           = AVMEDIA_TYPE_VIDEO,
     281             :     .id             = AV_CODEC_ID_VB,
     282             :     .priv_data_size = sizeof(VBDecContext),
     283             :     .init           = decode_init,
     284             :     .close          = decode_end,
     285             :     .decode         = decode_frame,
     286             :     .capabilities   = AV_CODEC_CAP_DR1,
     287             : };

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