GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/vcr1.c Lines: 49 54 90.7 %
Date: 2020-09-25 23:16:12 Branches: 18 24 75.0 %

Line Branch Exec Source
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/*
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 * ATI VCR1 codec
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 * Copyright (c) 2003 Michael Niedermayer
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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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 * ATI VCR1 codec
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 */
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#include "avcodec.h"
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#include "internal.h"
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#include "libavutil/avassert.h"
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#include "libavutil/internal.h"
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typedef struct VCR1Context {
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    int delta[16];
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    int offset[4];
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} VCR1Context;
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static av_cold int vcr1_decode_init(AVCodecContext *avctx)
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{
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2
    avctx->pix_fmt = AV_PIX_FMT_YUV410P;
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    if (avctx->width % 8 || avctx->height%4) {
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        avpriv_request_sample(avctx, "odd dimensions (%d x %d) support", avctx->width, avctx->height);
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        return AVERROR_INVALIDDATA;
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    }
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    return 0;
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}
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static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
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                             int *got_frame, AVPacket *avpkt)
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{
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    VCR1Context *const a      = avctx->priv_data;
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128
    AVFrame *const p          = data;
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128
    const uint8_t *bytestream = avpkt->data;
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128
    const uint8_t *bytestream_end = bytestream + avpkt->size;
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    int i, x, y, ret;
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128
    if(avpkt->size < 32 + avctx->height + avctx->width*avctx->height*5/8){
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        av_log(avctx, AV_LOG_ERROR, "Insufficient input data. %d < %d\n", avpkt->size ,  32 + avctx->height + avctx->width*avctx->height*5/8);
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        return AVERROR(EINVAL);
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    }
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    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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        return ret;
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128
    p->pict_type = AV_PICTURE_TYPE_I;
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    p->key_frame = 1;
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2176
    for (i = 0; i < 16; i++) {
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2048
        a->delta[i] = *bytestream++;
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2048
        bytestream++;
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    }
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18560
    for (y = 0; y < avctx->height; y++) {
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        int offset;
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18432
        uint8_t *luma = &p->data[0][y * p->linesize[0]];
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18432
        if ((y & 3) == 0) {
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4608
            uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]];
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4608
            uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]];
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4608
            av_assert0 (bytestream_end - bytestream >= 4 + avctx->width);
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23040
            for (i = 0; i < 4; i++)
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18432
                a->offset[i] = *bytestream++;
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4608
            offset = a->offset[0] - a->delta[bytestream[2] & 0xF];
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207360
            for (x = 0; x < avctx->width; x += 4) {
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202752
                luma[0]     = offset += a->delta[bytestream[2] & 0xF];
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202752
                luma[1]     = offset += a->delta[bytestream[2] >>  4];
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202752
                luma[2]     = offset += a->delta[bytestream[0] & 0xF];
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202752
                luma[3]     = offset += a->delta[bytestream[0] >>  4];
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202752
                luma       += 4;
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                *cb++       = bytestream[3];
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202752
                *cr++       = bytestream[1];
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                bytestream += 4;
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            }
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        } else {
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13824
            av_assert0 (bytestream_end - bytestream >= avctx->width / 2);
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13824
            offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF];
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317952
            for (x = 0; x < avctx->width; x += 8) {
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304128
                luma[0]     = offset += a->delta[bytestream[2] & 0xF];
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304128
                luma[1]     = offset += a->delta[bytestream[2] >>  4];
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304128
                luma[2]     = offset += a->delta[bytestream[3] & 0xF];
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304128
                luma[3]     = offset += a->delta[bytestream[3] >>  4];
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304128
                luma[4]     = offset += a->delta[bytestream[0] & 0xF];
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304128
                luma[5]     = offset += a->delta[bytestream[0] >>  4];
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304128
                luma[6]     = offset += a->delta[bytestream[1] & 0xF];
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304128
                luma[7]     = offset += a->delta[bytestream[1] >>  4];
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304128
                luma       += 8;
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304128
                bytestream += 4;
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            }
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        }
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    }
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    *got_frame = 1;
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    return bytestream - avpkt->data;
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}
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AVCodec ff_vcr1_decoder = {
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    .name           = "vcr1",
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    .long_name      = NULL_IF_CONFIG_SMALL("ATI VCR1"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_VCR1,
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    .priv_data_size = sizeof(VCR1Context),
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    .init           = vcr1_decode_init,
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    .decode         = vcr1_decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1,
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};