GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/8bps.c Lines: 54 77 70.1 %
Date: 2021-04-18 10:33:33 Branches: 22 32 68.8 %

Line Branch Exec Source
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/*
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 * Quicktime Planar RGB (8BPS) Video Decoder
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 * Copyright (C) 2003 Roberto Togni
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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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 * QT 8BPS Video Decoder by Roberto Togni
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 * For more information about the 8BPS format, visit:
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 *   http://www.pcisys.net/~melanson/codecs/
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 *
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 * Supports: PAL8 (RGB 8bpp, paletted)
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 *         : BGR24 (RGB 24bpp) (can also output it as RGB32)
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 *         : RGB32 (RGB 32bpp, 4th plane is alpha)
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "decode.h"
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#include "internal.h"
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static const enum AVPixelFormat pixfmt_rgb24[] = {
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    AV_PIX_FMT_BGR24, AV_PIX_FMT_0RGB32, AV_PIX_FMT_NONE };
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typedef struct EightBpsContext {
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    AVCodecContext *avctx;
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    unsigned char planes;
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    unsigned char planemap[4];
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    uint32_t pal[256];
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} EightBpsContext;
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static int 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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    const uint8_t *buf = avpkt->data;
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    int buf_size       = avpkt->size;
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    EightBpsContext * const c = avctx->priv_data;
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    const unsigned char *encoded = buf;
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    unsigned char *pixptr, *pixptr_end;
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    unsigned int height = avctx->height; // Real image height
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    unsigned int dlen, p, row;
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    const unsigned char *lp, *dp, *ep;
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    unsigned char count;
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    unsigned int px_inc;
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    unsigned int planes     = c->planes;
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    unsigned char *planemap = c->planemap;
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    int ret;
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    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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        return ret;
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    ep = encoded + buf_size;
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    /* Set data pointer after line lengths */
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    dp = encoded + planes * (height << 1);
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    px_inc = planes + (avctx->pix_fmt == AV_PIX_FMT_0RGB32);
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    for (p = 0; p < planes; p++) {
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        /* Lines length pointer for this plane */
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        lp = encoded + p * (height << 1);
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        /* Decode a plane */
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        for (row = 0; row < height; row++) {
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            pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
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            pixptr_end = pixptr + frame->linesize[0];
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            if (ep - lp < row * 2 + 2)
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                return AVERROR_INVALIDDATA;
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            dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
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            /* Decode a row of this plane */
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            while (dlen > 0) {
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                if (ep - dp <= 1)
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                    return AVERROR_INVALIDDATA;
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                if ((count = *dp++) <= 127) {
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                    count++;
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                    dlen -= count + 1;
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                    if (pixptr_end - pixptr < count * px_inc)
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                        break;
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                    if (ep - dp < count)
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                        return AVERROR_INVALIDDATA;
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                    while (count--) {
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                        *pixptr = *dp++;
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                        pixptr += px_inc;
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                    }
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                } else {
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                    count = 257 - count;
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                    if (pixptr_end - pixptr < count * px_inc)
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                        break;
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                    while (count--) {
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                        *pixptr = *dp;
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                        pixptr += px_inc;
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                    }
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                    dp++;
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                    dlen -= 2;
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                }
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            }
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        }
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    }
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    if (avctx->bits_per_coded_sample <= 8) {
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        frame->palette_has_changed = ff_copy_palette(c->pal, avpkt, avctx);
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        memcpy (frame->data[1], c->pal, AVPALETTE_SIZE);
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    }
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    *got_frame = 1;
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    /* always report that the buffer was completely consumed */
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    return buf_size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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    EightBpsContext * const c = avctx->priv_data;
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    c->avctx       = avctx;
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    switch (avctx->bits_per_coded_sample) {
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    case 8:
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        avctx->pix_fmt = AV_PIX_FMT_PAL8;
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        c->planes      = 1;
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        c->planemap[0] = 0; // 1st plane is palette indexes
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        break;
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    case 24:
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        avctx->pix_fmt = ff_get_format(avctx, pixfmt_rgb24);
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        c->planes      = 3;
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        c->planemap[0] = 2; // 1st plane is red
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        c->planemap[1] = 1; // 2nd plane is green
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        c->planemap[2] = 0; // 3rd plane is blue
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        break;
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    case 32:
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        avctx->pix_fmt = AV_PIX_FMT_RGB32;
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        c->planes      = 4;
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        /* handle planemap setup later for decoding rgb24 data as rbg32 */
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        break;
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    default:
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        av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
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               avctx->bits_per_coded_sample);
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        return AVERROR_INVALIDDATA;
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    }
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    if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
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        c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red
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        c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green
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        c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue
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        c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha
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    }
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    return 0;
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}
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AVCodec ff_eightbps_decoder = {
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    .name           = "8bps",
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    .long_name      = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_8BPS,
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    .priv_data_size = sizeof(EightBpsContext),
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    .init           = decode_init,
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    .decode         = decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1,
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};