LCOV - code coverage report
Current view: top level - src/libavcodec - bfi.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 79 90 87.8 %
Date: 2017-01-23 11:54:22 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Brute Force & Ignorance (BFI) video decoder
       3             :  * Copyright (c) 2008 Sisir Koppaka
       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             :  * @brief Brute Force & Ignorance (.bfi) video decoder
      25             :  * @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
      26             :  * @see http://wiki.multimedia.cx/index.php?title=BFI
      27             :  */
      28             : 
      29             : #include "libavutil/common.h"
      30             : #include "avcodec.h"
      31             : #include "bytestream.h"
      32             : #include "internal.h"
      33             : 
      34             : typedef struct BFIContext {
      35             :     AVCodecContext *avctx;
      36             :     uint8_t *dst;
      37             :     uint32_t pal[256];
      38             : } BFIContext;
      39             : 
      40           2 : static av_cold int bfi_decode_init(AVCodecContext *avctx)
      41             : {
      42           2 :     BFIContext *bfi = avctx->priv_data;
      43           2 :     avctx->pix_fmt  = AV_PIX_FMT_PAL8;
      44           2 :     bfi->dst        = av_mallocz(avctx->width * avctx->height);
      45           2 :     if (!bfi->dst)
      46           0 :         return AVERROR(ENOMEM);
      47           2 :     return 0;
      48             : }
      49             : 
      50          57 : static int bfi_decode_frame(AVCodecContext *avctx, void *data,
      51             :                             int *got_frame, AVPacket *avpkt)
      52             : {
      53          57 :     AVFrame *frame = data;
      54             :     GetByteContext g;
      55          57 :     int buf_size    = avpkt->size;
      56          57 :     BFIContext *bfi = avctx->priv_data;
      57          57 :     uint8_t *dst    = bfi->dst;
      58             :     uint8_t *src, *dst_offset, colour1, colour2;
      59          57 :     uint8_t *frame_end = bfi->dst + avctx->width * avctx->height;
      60             :     uint32_t *pal;
      61          57 :     int i, j, ret, height = avctx->height;
      62             : 
      63          57 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
      64           0 :         return ret;
      65             : 
      66          57 :     bytestream2_init(&g, avpkt->data, buf_size);
      67             : 
      68             :     /* Set frame parameters and palette, if necessary */
      69          57 :     if (!avctx->frame_number) {
      70           1 :         frame->pict_type = AV_PICTURE_TYPE_I;
      71           1 :         frame->key_frame = 1;
      72             :         /* Setting the palette */
      73           1 :         if (avctx->extradata_size > 768) {
      74           0 :             av_log(NULL, AV_LOG_ERROR, "Palette is too large.\n");
      75           0 :             return AVERROR_INVALIDDATA;
      76             :         }
      77           1 :         pal = (uint32_t *)frame->data[1];
      78         257 :         for (i = 0; i < avctx->extradata_size / 3; i++) {
      79         256 :             int shift = 16;
      80         256 :             *pal = 0xFFU << 24;
      81        1024 :             for (j = 0; j < 3; j++, shift -= 8)
      82        2304 :                 *pal += ((avctx->extradata[i * 3 + j] << 2) |
      83        1536 :                          (avctx->extradata[i * 3 + j] >> 4)) << shift;
      84         256 :             pal++;
      85             :         }
      86           1 :         memcpy(bfi->pal, frame->data[1], sizeof(bfi->pal));
      87           1 :         frame->palette_has_changed = 1;
      88             :     } else {
      89          56 :         frame->pict_type = AV_PICTURE_TYPE_P;
      90          56 :         frame->key_frame = 0;
      91          56 :         frame->palette_has_changed = 0;
      92          56 :         memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal));
      93             :     }
      94             : 
      95          57 :     bytestream2_skip(&g, 4); // Unpacked size, not required.
      96             : 
      97      319699 :     while (dst != frame_end) {
      98             :         static const uint8_t lentab[4] = { 0, 2, 0, 1 };
      99      319585 :         unsigned int byte   = bytestream2_get_byte(&g), av_uninit(offset);
     100      319585 :         unsigned int code   = byte >> 6;
     101      319585 :         unsigned int length = byte & ~0xC0;
     102             : 
     103      319585 :         if (!bytestream2_get_bytes_left(&g)) {
     104           0 :             av_log(avctx, AV_LOG_ERROR,
     105             :                    "Input resolution larger than actual frame.\n");
     106           0 :             return AVERROR_INVALIDDATA;
     107             :         }
     108             : 
     109             :         /* Get length and offset (if required) */
     110      319585 :         if (length == 0) {
     111       46045 :             if (code == 1) {
     112       44996 :                 length = bytestream2_get_byte(&g);
     113       44996 :                 offset = bytestream2_get_le16(&g);
     114             :             } else {
     115        1049 :                 length = bytestream2_get_le16(&g);
     116        1049 :                 if (code == 2 && length == 0)
     117           0 :                     break;
     118             :             }
     119             :         } else {
     120      273540 :             if (code == 1)
     121        7005 :                 offset = bytestream2_get_byte(&g);
     122             :         }
     123             : 
     124             :         /* Do boundary check */
     125      319585 :         if (dst + (length << lentab[code]) > frame_end)
     126           0 :             break;
     127             : 
     128      319585 :         switch (code) {
     129             :         case 0:                // normal chain
     130      124968 :             if (length >= bytestream2_get_bytes_left(&g)) {
     131           0 :                 av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n");
     132           0 :                 return AVERROR_INVALIDDATA;
     133             :             }
     134      124968 :             bytestream2_get_buffer(&g, dst, length);
     135      124968 :             dst += length;
     136      124968 :             break;
     137             :         case 1:                // back chain
     138       52001 :             dst_offset = dst - offset;
     139       52001 :             length    *= 4;     // Convert dwords to bytes.
     140       52001 :             if (dst_offset < bfi->dst)
     141           0 :                 break;
     142      923278 :             while (length--)
     143      819276 :                 *dst++ = *dst_offset++;
     144       52001 :             break;
     145             :         case 2:                // skip chain
     146      133856 :             dst += length;
     147      133856 :             break;
     148             :         case 3:                // fill chain
     149        8760 :             colour1 = bytestream2_get_byte(&g);
     150        8760 :             colour2 = bytestream2_get_byte(&g);
     151       53109 :             while (length--) {
     152       35589 :                 *dst++ = colour1;
     153       35589 :                 *dst++ = colour2;
     154             :             }
     155        8760 :             break;
     156             :         }
     157             :     }
     158             : 
     159          57 :     src = bfi->dst;
     160          57 :     dst = frame->data[0];
     161        8094 :     while (height--) {
     162        7980 :         memcpy(dst, src, avctx->width);
     163        7980 :         src += avctx->width;
     164        7980 :         dst += frame->linesize[0];
     165             :     }
     166          57 :     *got_frame = 1;
     167             : 
     168          57 :     return buf_size;
     169             : }
     170             : 
     171           2 : static av_cold int bfi_decode_close(AVCodecContext *avctx)
     172             : {
     173           2 :     BFIContext *bfi = avctx->priv_data;
     174           2 :     av_freep(&bfi->dst);
     175           2 :     return 0;
     176             : }
     177             : 
     178             : AVCodec ff_bfi_decoder = {
     179             :     .name           = "bfi",
     180             :     .long_name      = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),
     181             :     .type           = AVMEDIA_TYPE_VIDEO,
     182             :     .id             = AV_CODEC_ID_BFI,
     183             :     .priv_data_size = sizeof(BFIContext),
     184             :     .init           = bfi_decode_init,
     185             :     .close          = bfi_decode_close,
     186             :     .decode         = bfi_decode_frame,
     187             :     .capabilities   = AV_CODEC_CAP_DR1,
     188             : };

Generated by: LCOV version 1.12