GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/bfi.c Lines: 84 95 88.4 %
Date: 2019-11-18 18:00:01 Branches: 34 43 79.1 %

Line Branch Exec Source
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/*
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 * Brute Force & Ignorance (BFI) video decoder
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 * Copyright (c) 2008 Sisir Koppaka
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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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 * @brief Brute Force & Ignorance (.bfi) video decoder
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 * @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
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 * @see http://wiki.multimedia.cx/index.php?title=BFI
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 */
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#include "libavutil/common.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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typedef struct BFIContext {
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    AVCodecContext *avctx;
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    uint8_t *dst;
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    uint32_t pal[256];
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} BFIContext;
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2
static av_cold int bfi_decode_init(AVCodecContext *avctx)
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{
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2
    BFIContext *bfi = avctx->priv_data;
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2
    avctx->pix_fmt  = AV_PIX_FMT_PAL8;
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2
    bfi->dst        = av_mallocz(avctx->width * avctx->height);
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2
    if (!bfi->dst)
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        return AVERROR(ENOMEM);
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2
    return 0;
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}
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static int bfi_decode_frame(AVCodecContext *avctx, void *data,
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                            int *got_frame, AVPacket *avpkt)
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{
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    AVFrame *frame = data;
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    GetByteContext g;
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    int buf_size    = avpkt->size;
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    BFIContext *bfi = avctx->priv_data;
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    uint8_t *dst    = bfi->dst;
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    uint8_t *src, *dst_offset, colour1, colour2;
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    uint8_t *frame_end = bfi->dst + avctx->width * avctx->height;
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    uint32_t *pal;
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    int i, j, ret, height = avctx->height;
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    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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        return ret;
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    bytestream2_init(&g, avpkt->data, buf_size);
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    /* Set frame parameters and palette, if necessary */
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    if (!avctx->frame_number) {
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1
        frame->pict_type = AV_PICTURE_TYPE_I;
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1
        frame->key_frame = 1;
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        /* Setting the palette */
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1
        if (avctx->extradata_size > 768) {
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            av_log(avctx, AV_LOG_ERROR, "Palette is too large.\n");
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            return AVERROR_INVALIDDATA;
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        }
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1
        pal = (uint32_t *)frame->data[1];
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257
        for (i = 0; i < avctx->extradata_size / 3; i++) {
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256
            int shift = 16;
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256
            *pal = 0xFFU << 24;
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1024
            for (j = 0; j < 3; j++, shift -= 8)
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768
                *pal += ((avctx->extradata[i * 3 + j] << 2) |
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768
                         (avctx->extradata[i * 3 + j] >> 4)) << shift;
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256
            pal++;
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        }
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1
        memcpy(bfi->pal, frame->data[1], sizeof(bfi->pal));
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1
        frame->palette_has_changed = 1;
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    } else {
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        frame->pict_type = AV_PICTURE_TYPE_P;
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        frame->key_frame = 0;
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        frame->palette_has_changed = 0;
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        memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal));
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    }
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    bytestream2_skip(&g, 4); // Unpacked size, not required.
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    while (dst != frame_end) {
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        static const uint8_t lentab[4] = { 0, 2, 0, 1 };
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319585
        unsigned int byte   = bytestream2_get_byte(&g), av_uninit(offset);
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319585
        unsigned int code   = byte >> 6;
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319585
        unsigned int length = byte & ~0xC0;
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319585
        if (!bytestream2_get_bytes_left(&g)) {
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            av_log(avctx, AV_LOG_ERROR,
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                   "Input resolution larger than actual frame.\n");
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            return AVERROR_INVALIDDATA;
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        }
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        /* Get length and offset (if required) */
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319585
        if (length == 0) {
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46045
            if (code == 1) {
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44996
                length = bytestream2_get_byte(&g);
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44996
                offset = bytestream2_get_le16(&g);
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            } else {
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1049
                length = bytestream2_get_le16(&g);
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1049
                if (code == 2 && length == 0)
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                    break;
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            }
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        } else {
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273540
            if (code == 1)
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7005
                offset = bytestream2_get_byte(&g);
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        }
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        /* Do boundary check */
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319585
        if (dst + (length << lentab[code]) > frame_end)
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            break;
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319585
        switch (code) {
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124968
        case 0:                // normal chain
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124968
            if (length >= bytestream2_get_bytes_left(&g)) {
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                av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n");
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                return AVERROR_INVALIDDATA;
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            }
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124968
            bytestream2_get_buffer(&g, dst, length);
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124968
            dst += length;
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124968
            break;
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52001
        case 1:                // back chain
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52001
            dst_offset = dst - offset;
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52001
            length    *= 4;     // Convert dwords to bytes.
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52001
            if (dst_offset < bfi->dst)
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                break;
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871277
            while (length--)
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819276
                *dst++ = *dst_offset++;
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52001
            break;
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        case 2:                // skip chain
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133856
            dst += length;
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133856
            break;
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        case 3:                // fill chain
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8760
            colour1 = bytestream2_get_byte(&g);
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8760
            colour2 = bytestream2_get_byte(&g);
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44349
            while (length--) {
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35589
                *dst++ = colour1;
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35589
                *dst++ = colour2;
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            }
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8760
            break;
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        }
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319642
    }
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    src = bfi->dst;
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    dst = frame->data[0];
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8037
    while (height--) {
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7980
        memcpy(dst, src, avctx->width);
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7980
        src += avctx->width;
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7980
        dst += frame->linesize[0];
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    }
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    *got_frame = 1;
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    return buf_size;
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}
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static av_cold int bfi_decode_close(AVCodecContext *avctx)
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{
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2
    BFIContext *bfi = avctx->priv_data;
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2
    av_freep(&bfi->dst);
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2
    return 0;
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}
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AVCodec ff_bfi_decoder = {
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    .name           = "bfi",
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    .long_name      = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_BFI,
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    .priv_data_size = sizeof(BFIContext),
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    .init           = bfi_decode_init,
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    .close          = bfi_decode_close,
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    .decode         = bfi_decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1,
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    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
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};