GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/xfacedec.c Lines: 83 88 94.3 %
Date: 2020-08-14 10:39:37 Branches: 36 43 83.7 %

Line Branch Exec Source
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/*
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 * Copyright (c) 1990 James Ashton - Sydney University
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 * Copyright (c) 2012 Stefano Sabatini
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * X-Face decoder, based on libcompface, by James Ashton.
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 */
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#include "libavutil/pixdesc.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#include "xface.h"
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194021
static int pop_integer(BigInt *b, const ProbRange *pranges)
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{
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    uint8_t r;
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    int i;
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    /* extract the last byte into r, and shift right b by 8 bits */
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194021
    ff_big_div(b, 0, &r);
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194021
    i = 0;
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776193
    while (r < pranges->offset || r >= pranges->range + pranges->offset) {
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582172
        pranges++;
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582172
        i++;
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    }
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194021
    ff_big_mul(b, pranges->range);
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194021
    ff_big_add(b, r - pranges->offset);
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194021
    return i;
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}
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97901
static void pop_greys(BigInt *b, char *bitmap, int w, int h)
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{
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97901
    if (w > 3) {
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11033
        w /= 2;
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11033
        h /= 2;
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11033
        pop_greys(b, bitmap,                       w, h);
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11033
        pop_greys(b, bitmap + w,                   w, h);
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11033
        pop_greys(b, bitmap + XFACE_WIDTH * h,     w, h);
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11033
        pop_greys(b, bitmap + XFACE_WIDTH * h + w, w, h);
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    } else {
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86868
        w = pop_integer(b, ff_xface_probranges_2x2);
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86868
        if (w & 1) bitmap[0]               = 1;
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86868
        if (w & 2) bitmap[1]               = 1;
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86868
        if (w & 4) bitmap[XFACE_WIDTH]     = 1;
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86868
        if (w & 8) bitmap[XFACE_WIDTH + 1] = 1;
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    }
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97901
}
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107153
static void decode_block(BigInt *b, char *bitmap, int w, int h, int level)
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{
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107153
    switch (pop_integer(b, &ff_xface_probranges_per_level[level][0])) {
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27048
    case XFACE_COLOR_WHITE:
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27048
        return;
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53769
    case XFACE_COLOR_BLACK:
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53769
        pop_greys(b, bitmap, w, h);
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53769
        return;
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26336
    default:
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26336
        w /= 2;
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26336
        h /= 2;
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26336
        level++;
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26336
        decode_block(b, bitmap,                       w, h, level);
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26336
        decode_block(b, bitmap + w,                   w, h, level);
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26336
        decode_block(b, bitmap + h * XFACE_WIDTH,     w, h, level);
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26336
        decode_block(b, bitmap + w + h * XFACE_WIDTH, w, h, level);
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26336
        return;
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    }
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}
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typedef struct XFaceContext {
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    uint8_t bitmap[XFACE_PIXELS]; ///< image used internally for decoding
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} XFaceContext;
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static av_cold int xface_decode_init(AVCodecContext *avctx)
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{
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    if (avctx->width || avctx->height) {
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        if (avctx->width != XFACE_WIDTH || avctx->height != XFACE_HEIGHT) {
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            av_log(avctx, AV_LOG_ERROR,
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                   "Size value %dx%d not supported, only accepts a size of %dx%d\n",
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                   avctx->width, avctx->height, XFACE_WIDTH, XFACE_HEIGHT);
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            return AVERROR(EINVAL);
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        }
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    }
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    avctx->width   = XFACE_WIDTH;
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    avctx->height  = XFACE_HEIGHT;
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    avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
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    return 0;
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}
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static int xface_decode_frame(AVCodecContext *avctx,
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                              void *data, int *got_frame,
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                              AVPacket *avpkt)
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{
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    XFaceContext *xface = avctx->priv_data;
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    int ret, i, j, k;
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    uint8_t byte;
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    BigInt b = {0};
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    char *buf;
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    int64_t c;
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    AVFrame *frame = data;
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    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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        return ret;
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68153
    for (i = 0, k = 0; i < avpkt->size && avpkt->data[i]; i++) {
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67952
        c = avpkt->data[i];
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        /* ignore invalid digits */
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67952
        if (c < XFACE_FIRST_PRINT || c > XFACE_LAST_PRINT)
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            continue;
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67751
        if (++k > XFACE_MAX_DIGITS) {
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            av_log(avctx, AV_LOG_WARNING,
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                   "Buffer is longer than expected, truncating at byte %d\n", i);
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            break;
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        }
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67751
        ff_big_mul(&b, XFACE_PRINTS);
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67751
        ff_big_add(&b, c - XFACE_FIRST_PRINT);
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    }
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    /* decode image and put it in bitmap */
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    memset(xface->bitmap, 0, XFACE_PIXELS);
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    buf = xface->bitmap;
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    decode_block(&b, buf,                         16, 16, 0);
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    decode_block(&b, buf + 16,                    16, 16, 0);
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    decode_block(&b, buf + 32,                    16, 16, 0);
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    decode_block(&b, buf + XFACE_WIDTH * 16,      16, 16, 0);
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    decode_block(&b, buf + XFACE_WIDTH * 16 + 16, 16, 16, 0);
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    decode_block(&b, buf + XFACE_WIDTH * 16 + 32, 16, 16, 0);
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    decode_block(&b, buf + XFACE_WIDTH * 32     , 16, 16, 0);
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    decode_block(&b, buf + XFACE_WIDTH * 32 + 16, 16, 16, 0);
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    decode_block(&b, buf + XFACE_WIDTH * 32 + 32, 16, 16, 0);
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    ff_xface_generate_face(xface->bitmap, xface->bitmap);
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    /* convert image from 1=black 0=white bitmap to MONOWHITE */
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    buf = frame->data[0];
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463305
    for (i = 0, j = 0, k = 0, byte = 0; i < XFACE_PIXELS; i++) {
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463104
        byte += xface->bitmap[i];
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463104
        if (k == 7) {
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57888
            buf[j++] = byte;
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57888
            byte = k = 0;
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        } else {
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405216
            k++;
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405216
            byte <<= 1;
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        }
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463104
        if (j == XFACE_WIDTH/8) {
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9648
            j = 0;
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9648
            buf += frame->linesize[0];
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        }
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    }
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201
    *got_frame = 1;
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    return avpkt->size;
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}
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AVCodec ff_xface_decoder = {
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    .name           = "xface",
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    .long_name      = NULL_IF_CONFIG_SMALL("X-face image"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_XFACE,
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    .priv_data_size = sizeof(XFaceContext),
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    .init           = xface_decode_init,
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    .decode         = xface_decode_frame,
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    .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE, AV_PIX_FMT_NONE },
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};