/* * Cirrus Logic AccuPak (CLJR) decoder * Copyright (c) 2003 Alex Beregszaszi * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Cirrus Logic AccuPak decoder. */ #include "avcodec.h"#include "codec_internal.h"#include "decode.h"#include "get_bits.h" static int decode_frame(AVCodecContext *avctx, AVFrame *p,                        int *got_frame, AVPacket *avpkt){    const uint8_t *buf = avpkt->data;    int buf_size       = avpkt->size;    GetBitContext gb;    int x, y, ret;     if (avctx->height <= 0 || avctx->width <= 0) {        av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");        return AVERROR_INVALIDDATA;    }     if (buf_size / avctx->height < avctx->width) {        av_log(avctx, AV_LOG_ERROR,               "Resolution larger than buffer size. Invalid header?\n");        return AVERROR_INVALIDDATA;    }     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)        return ret;     init_get_bits(&gb, buf, buf_size * 8);     for (y = 0; y < avctx->height; y++) {        uint8_t *luma = &p->data[0][y * p->linesize[0]];        uint8_t *cb   = &p->data[1][y * p->linesize[1]];        uint8_t *cr   = &p->data[2][y * p->linesize[2]];        for (x = 0; x < avctx->width; x += 4) {            luma[3] = (get_bits(&gb, 5)*33) >> 2;            luma[2] = (get_bits(&gb, 5)*33) >> 2;            luma[1] = (get_bits(&gb, 5)*33) >> 2;            luma[0] = (get_bits(&gb, 5)*33) >> 2;            luma += 4;            *(cb++) = get_bits(&gb, 6) << 2;            *(cr++) = get_bits(&gb, 6) << 2;        }    }     *got_frame = 1;     return buf_size;} static av_cold int decode_init(AVCodecContext *avctx){    avctx->pix_fmt = AV_PIX_FMT_YUV411P;    return 0;} const FFCodec ff_cljr_decoder = {    .p.name         = "cljr",    CODEC_LONG_NAME("Cirrus Logic AccuPak"),    .p.type         = AVMEDIA_TYPE_VIDEO,    .p.id           = AV_CODEC_ID_CLJR,    .init           = decode_init,    FF_CODEC_DECODE_CB(decode_frame),    .p.capabilities = AV_CODEC_CAP_DR1,};