GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/aliaspixdec.c Lines: 41 54 75.9 %
Date: 2019-11-18 18:00:01 Branches: 22 32 68.8 %

Line Branch Exec Source
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/*
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 * Alias PIX image decoder
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 * Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
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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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#include "libavutil/intreadwrite.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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#define ALIAS_HEADER_SIZE 10
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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                        AVPacket *avpkt)
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{
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    AVFrame *f = data;
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    GetByteContext gb;
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    int width, height, ret, bits_pixel, pixel;
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    uint8_t *out_buf;
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    uint8_t count;
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    int x, y;
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    bytestream2_init(&gb, avpkt->data, avpkt->size);
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    if (bytestream2_get_bytes_left(&gb) < ALIAS_HEADER_SIZE) {
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        av_log(avctx, AV_LOG_ERROR, "Header too small %d.\n", avpkt->size);
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        return AVERROR_INVALIDDATA;
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    }
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    width  = bytestream2_get_be16u(&gb);
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    height = bytestream2_get_be16u(&gb);
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    bytestream2_skipu(&gb, 4); // obsolete X, Y offset
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    bits_pixel = bytestream2_get_be16u(&gb);
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    if (bits_pixel == 24)
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2
        avctx->pix_fmt = AV_PIX_FMT_BGR24;
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    else if (bits_pixel == 8)
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        avctx->pix_fmt = AV_PIX_FMT_GRAY8;
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    else {
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        av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n");
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        return AVERROR_INVALIDDATA;
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    }
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    ret = ff_set_dimensions(avctx, width, height);
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    if (ret < 0)
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        return ret;
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    if (bytestream2_get_bytes_left(&gb) < width*height / 255)
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        return AVERROR_INVALIDDATA;
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    ret = ff_get_buffer(avctx, f, 0);
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    if (ret < 0)
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        return ret;
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    f->pict_type = AV_PICTURE_TYPE_I;
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    f->key_frame = 1;
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    x = 0;
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    y = 1;
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    out_buf = f->data[0];
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60402
    while (bytestream2_get_bytes_left(&gb) > 0) {
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        int i;
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        /* set buffer at the right position at every new line */
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        if (x == avctx->width) {
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            x = 0;
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            out_buf = f->data[0] + f->linesize[0] * y++;
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            if (y > avctx->height) {
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                av_log(avctx, AV_LOG_ERROR,
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                       "Ended frame decoding with %d bytes left.\n",
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                       bytestream2_get_bytes_left(&gb));
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                return AVERROR_INVALIDDATA;
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            }
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        }
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        /* read packet and copy data */
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        count = bytestream2_get_byteu(&gb);
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        if (!count || x + count > avctx->width) {
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            av_log(avctx, AV_LOG_ERROR, "Invalid run length %d.\n", count);
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            return AVERROR_INVALIDDATA;
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        }
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        if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
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            pixel = bytestream2_get_be24(&gb);
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            for (i = 0; i < count; i++) {
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                AV_WB24(out_buf, pixel);
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                out_buf += 3;
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            }
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        } else { // AV_PIX_FMT_GRAY8
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28858
            pixel = bytestream2_get_byte(&gb);
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            for (i = 0; i < count; i++)
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                *out_buf++ = pixel;
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        }
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        x += i;
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    }
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    if (x != width || y != height) {
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        av_log(avctx, AV_LOG_ERROR, "Picture stopped at %d,%d.\n", x, y);
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        return AVERROR_INVALIDDATA;
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    }
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    *got_frame = 1;
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    return avpkt->size;
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}
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AVCodec ff_alias_pix_decoder = {
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    .name         = "alias_pix",
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    .long_name    = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
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    .type         = AVMEDIA_TYPE_VIDEO,
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    .id           = AV_CODEC_ID_ALIAS_PIX,
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    .decode       = decode_frame,
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    .capabilities = AV_CODEC_CAP_DR1,
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};