GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/sgirledec.c Lines: 39 45 86.7 %
Date: 2020-08-11 16:46:18 Branches: 21 34 61.8 %

Line Branch Exec Source
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/*
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 * Silicon Graphics RLE 8-bit video decoder
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 * Copyright (c) 2012 Peter Ross
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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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 * Silicon Graphics RLE 8-bit video decoder
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 * @note Data is packed in rbg323 with rle, contained in mv or mov.
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 * The algorithm and pixfmt are subtly different from SGI images.
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 */
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#include "libavutil/common.h"
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#include "avcodec.h"
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#include "internal.h"
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static av_cold int sgirle_decode_init(AVCodecContext *avctx)
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{
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    avctx->pix_fmt = AV_PIX_FMT_BGR8;
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    return 0;
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}
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/**
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 * Convert SGI RBG323 pixel into AV_PIX_FMT_BGR8
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 * SGI RGB data is packed as 8bpp, (msb)3R 2B 3G(lsb)
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 */
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#define RBG323_TO_BGR8(x) ((((x) << 3) & 0xC0) |                                \
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                           (((x) << 3) & 0x38) |                                \
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                           (((x) >> 5) & 7))
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static av_always_inline
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void rbg323_to_bgr8(uint8_t *dst, const uint8_t *src, int size)
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{
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    int i;
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    for (i = 0; i < size; i++)
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        dst[i] = RBG323_TO_BGR8(src[i]);
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}
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/**
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 * @param[out] dst Destination buffer
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 * @param[in] src  Source buffer
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 * @param src_size Source buffer size (bytes)
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 * @param width    Width of destination buffer (pixels)
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 * @param height   Height of destination buffer (pixels)
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 * @param linesize Line size of destination buffer (bytes)
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 *
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 * @return <0 on error
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 */
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static int decode_sgirle8(AVCodecContext *avctx, uint8_t *dst,
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                          const uint8_t *src, int src_size,
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                          int width, int height, ptrdiff_t linesize)
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{
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    const uint8_t *src_end = src + src_size;
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    int x = 0, y = 0;
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#define INC_XY(n)                                                             \
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    x += n;                                                                   \
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    if (x >= width) {                                                         \
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        y++;                                                                  \
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        if (y >= height)                                                      \
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            return 0;                                                         \
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        x = 0;                                                                \
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    }
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    while (src_end - src >= 2) {
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        uint8_t v = *src++;
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        if (v > 0 && v < 0xC0) {
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            do {
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                int length = FFMIN(v, width - x);
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                if (length <= 0)
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                    break;
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                memset(dst + y * linesize + x, RBG323_TO_BGR8(*src), length);
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                INC_XY(length);
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                v -= length;
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            } while (v > 0);
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            src++;
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        } else if (v >= 0xC1) {
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            v -= 0xC0;
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            do {
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                int length = FFMIN3(v, width - x, src_end - src);
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                if (src_end - src < length || length <= 0)
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                    break;
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                rbg323_to_bgr8(dst + y * linesize + x, src, length);
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                INC_XY(length);
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                src += length;
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                v   -= length;
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            } while (v > 0);
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        } else {
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            avpriv_request_sample(avctx, "opcode %d", v);
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            return AVERROR_PATCHWELCOME;
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        }
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    }
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    return 0;
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}
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static int sgirle_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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    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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    ret = decode_sgirle8(avctx, frame->data[0], avpkt->data, avpkt->size,
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                         avctx->width, avctx->height, frame->linesize[0]);
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    if (ret < 0)
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        return ret;
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    frame->pict_type = AV_PICTURE_TYPE_I;
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    frame->key_frame = 1;
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    *got_frame = 1;
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    return avpkt->size;
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}
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AVCodec ff_sgirle_decoder = {
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    .name           = "sgirle",
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    .long_name      = NULL_IF_CONFIG_SMALL("Silicon Graphics RLE 8-bit video"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_SGIRLE,
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    .init           = sgirle_decode_init,
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    .decode         = sgirle_decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1,
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};