LCOV - code coverage report
Current view: top level - libavcodec - xfacedec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 83 88 94.3 %
Date: 2017-12-17 11:58:42 Functions: 5 5 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 1990 James Ashton - Sydney University
       3             :  * Copyright (c) 2012 Stefano Sabatini
       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             :  * X-Face decoder, based on libcompface, by James Ashton.
      25             :  */
      26             : 
      27             : #include "libavutil/pixdesc.h"
      28             : #include "avcodec.h"
      29             : #include "bytestream.h"
      30             : #include "internal.h"
      31             : #include "xface.h"
      32             : 
      33      194021 : static int pop_integer(BigInt *b, const ProbRange *pranges)
      34             : {
      35             :     uint8_t r;
      36             :     int i;
      37             : 
      38             :     /* extract the last byte into r, and shift right b by 8 bits */
      39      194021 :     ff_big_div(b, 0, &r);
      40             : 
      41      194021 :     i = 0;
      42      970214 :     while (r < pranges->offset || r >= pranges->range + pranges->offset) {
      43      582172 :         pranges++;
      44      582172 :         i++;
      45             :     }
      46      194021 :     ff_big_mul(b, pranges->range);
      47      194021 :     ff_big_add(b, r - pranges->offset);
      48      194021 :     return i;
      49             : }
      50             : 
      51       97901 : static void pop_greys(BigInt *b, char *bitmap, int w, int h)
      52             : {
      53       97901 :     if (w > 3) {
      54       11033 :         w /= 2;
      55       11033 :         h /= 2;
      56       11033 :         pop_greys(b, bitmap,                       w, h);
      57       11033 :         pop_greys(b, bitmap + w,                   w, h);
      58       11033 :         pop_greys(b, bitmap + XFACE_WIDTH * h,     w, h);
      59       11033 :         pop_greys(b, bitmap + XFACE_WIDTH * h + w, w, h);
      60             :     } else {
      61       86868 :         w = pop_integer(b, ff_xface_probranges_2x2);
      62       86868 :         if (w & 1) bitmap[0]               = 1;
      63       86868 :         if (w & 2) bitmap[1]               = 1;
      64       86868 :         if (w & 4) bitmap[XFACE_WIDTH]     = 1;
      65       86868 :         if (w & 8) bitmap[XFACE_WIDTH + 1] = 1;
      66             :     }
      67       97901 : }
      68             : 
      69      107153 : static void decode_block(BigInt *b, char *bitmap, int w, int h, int level)
      70             : {
      71      107153 :     switch (pop_integer(b, &ff_xface_probranges_per_level[level][0])) {
      72       27048 :     case XFACE_COLOR_WHITE:
      73       27048 :         return;
      74       53769 :     case XFACE_COLOR_BLACK:
      75       53769 :         pop_greys(b, bitmap, w, h);
      76       53769 :         return;
      77       26336 :     default:
      78       26336 :         w /= 2;
      79       26336 :         h /= 2;
      80       26336 :         level++;
      81       26336 :         decode_block(b, bitmap,                       w, h, level);
      82       26336 :         decode_block(b, bitmap + w,                   w, h, level);
      83       26336 :         decode_block(b, bitmap + h * XFACE_WIDTH,     w, h, level);
      84       26336 :         decode_block(b, bitmap + w + h * XFACE_WIDTH, w, h, level);
      85       26336 :         return;
      86             :     }
      87             : }
      88             : 
      89             : typedef struct XFaceContext {
      90             :     uint8_t bitmap[XFACE_PIXELS]; ///< image used internally for decoding
      91             : } XFaceContext;
      92             : 
      93          10 : static av_cold int xface_decode_init(AVCodecContext *avctx)
      94             : {
      95          10 :     if (avctx->width || avctx->height) {
      96           9 :         if (avctx->width != XFACE_WIDTH || avctx->height != XFACE_HEIGHT) {
      97           0 :             av_log(avctx, AV_LOG_ERROR,
      98             :                    "Size value %dx%d not supported, only accepts a size of %dx%d\n",
      99             :                    avctx->width, avctx->height, XFACE_WIDTH, XFACE_HEIGHT);
     100           0 :             return AVERROR(EINVAL);
     101             :         }
     102             :     }
     103             : 
     104          10 :     avctx->width   = XFACE_WIDTH;
     105          10 :     avctx->height  = XFACE_HEIGHT;
     106          10 :     avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
     107             : 
     108          10 :     return 0;
     109             : }
     110             : 
     111         201 : static int xface_decode_frame(AVCodecContext *avctx,
     112             :                               void *data, int *got_frame,
     113             :                               AVPacket *avpkt)
     114             : {
     115         201 :     XFaceContext *xface = avctx->priv_data;
     116             :     int ret, i, j, k;
     117             :     uint8_t byte;
     118         201 :     BigInt b = {0};
     119             :     char *buf;
     120             :     int64_t c;
     121         201 :     AVFrame *frame = data;
     122             : 
     123         201 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
     124           0 :         return ret;
     125             : 
     126       68153 :     for (i = 0, k = 0; avpkt->data[i] && i < avpkt->size; i++) {
     127       67952 :         c = avpkt->data[i];
     128             : 
     129             :         /* ignore invalid digits */
     130       67952 :         if (c < XFACE_FIRST_PRINT || c > XFACE_LAST_PRINT)
     131         201 :             continue;
     132             : 
     133       67751 :         if (++k > XFACE_MAX_DIGITS) {
     134           0 :             av_log(avctx, AV_LOG_WARNING,
     135             :                    "Buffer is longer than expected, truncating at byte %d\n", i);
     136           0 :             break;
     137             :         }
     138       67751 :         ff_big_mul(&b, XFACE_PRINTS);
     139       67751 :         ff_big_add(&b, c - XFACE_FIRST_PRINT);
     140             :     }
     141             : 
     142             :     /* decode image and put it in bitmap */
     143         201 :     memset(xface->bitmap, 0, XFACE_PIXELS);
     144         201 :     buf = xface->bitmap;
     145         201 :     decode_block(&b, buf,                         16, 16, 0);
     146         201 :     decode_block(&b, buf + 16,                    16, 16, 0);
     147         201 :     decode_block(&b, buf + 32,                    16, 16, 0);
     148         201 :     decode_block(&b, buf + XFACE_WIDTH * 16,      16, 16, 0);
     149         201 :     decode_block(&b, buf + XFACE_WIDTH * 16 + 16, 16, 16, 0);
     150         201 :     decode_block(&b, buf + XFACE_WIDTH * 16 + 32, 16, 16, 0);
     151         201 :     decode_block(&b, buf + XFACE_WIDTH * 32     , 16, 16, 0);
     152         201 :     decode_block(&b, buf + XFACE_WIDTH * 32 + 16, 16, 16, 0);
     153         201 :     decode_block(&b, buf + XFACE_WIDTH * 32 + 32, 16, 16, 0);
     154             : 
     155         201 :     ff_xface_generate_face(xface->bitmap, xface->bitmap);
     156             : 
     157             :     /* convert image from 1=black 0=white bitmap to MONOWHITE */
     158         201 :     buf = frame->data[0];
     159      463305 :     for (i = 0, j = 0, k = 0, byte = 0; i < XFACE_PIXELS; i++) {
     160      463104 :         byte += xface->bitmap[i];
     161      463104 :         if (k == 7) {
     162       57888 :             buf[j++] = byte;
     163       57888 :             byte = k = 0;
     164             :         } else {
     165      405216 :             k++;
     166      405216 :             byte <<= 1;
     167             :         }
     168      463104 :         if (j == XFACE_WIDTH/8) {
     169        9648 :             j = 0;
     170        9648 :             buf += frame->linesize[0];
     171             :         }
     172             :     }
     173             : 
     174         201 :     *got_frame = 1;
     175             : 
     176         201 :     return avpkt->size;
     177             : }
     178             : 
     179             : AVCodec ff_xface_decoder = {
     180             :     .name           = "xface",
     181             :     .long_name      = NULL_IF_CONFIG_SMALL("X-face image"),
     182             :     .type           = AVMEDIA_TYPE_VIDEO,
     183             :     .id             = AV_CODEC_ID_XFACE,
     184             :     .priv_data_size = sizeof(XFaceContext),
     185             :     .init           = xface_decode_init,
     186             :     .decode         = xface_decode_frame,
     187             :     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE, AV_PIX_FMT_NONE },
     188             : };

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