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ffmpeg / libavcodec / cljr.c @ 2912e87a

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/*
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 * Cirrus Logic AccuPak (CLJR) codec
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 * Copyright (c) 2003 Alex Beregszaszi
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 *
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 * This file is part of Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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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 * Cirrus Logic AccuPak codec.
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 */
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#include "avcodec.h"
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#include "dsputil.h"
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#include "get_bits.h"
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/* Disable the encoder. */
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#undef CONFIG_CLJR_ENCODER
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#define CONFIG_CLJR_ENCODER 0
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typedef struct CLJRContext{
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    AVCodecContext *avctx;
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    AVFrame picture;
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    int delta[16];
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    int offset[4];
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    GetBitContext gb;
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} CLJRContext;
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static int decode_frame(AVCodecContext *avctx,
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                        void *data, int *data_size,
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                        AVPacket *avpkt)
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{
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    const uint8_t *buf = avpkt->data;
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    int buf_size = avpkt->size;
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    CLJRContext * const a = avctx->priv_data;
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    AVFrame *picture = data;
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    AVFrame * const p= (AVFrame*)&a->picture;
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    int x, y;
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    if(p->data[0])
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        avctx->release_buffer(avctx, p);
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    if(buf_size/avctx->height < avctx->width) {
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        av_log(avctx, AV_LOG_ERROR, "Resolution larger than buffer size. Invalid header?\n");
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        return -1;
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    }
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    p->reference= 0;
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    if(avctx->get_buffer(avctx, p) < 0){
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        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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        return -1;
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    }
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    p->pict_type= FF_I_TYPE;
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    p->key_frame= 1;
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    init_get_bits(&a->gb, buf, buf_size);
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    for(y=0; y<avctx->height; y++){
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        uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
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        uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
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        uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
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        for(x=0; x<avctx->width; x+=4){
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                luma[3] = get_bits(&a->gb, 5) << 3;
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            luma[2] = get_bits(&a->gb, 5) << 3;
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            luma[1] = get_bits(&a->gb, 5) << 3;
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            luma[0] = get_bits(&a->gb, 5) << 3;
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            luma+= 4;
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            *(cb++) = get_bits(&a->gb, 6) << 2;
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            *(cr++) = get_bits(&a->gb, 6) << 2;
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        }
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    }
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    *picture= *(AVFrame*)&a->picture;
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    *data_size = sizeof(AVPicture);
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    emms_c();
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    return buf_size;
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}
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#if CONFIG_CLJR_ENCODER
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static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
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    CLJRContext * const a = avctx->priv_data;
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    AVFrame *pict = data;
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    AVFrame * const p= (AVFrame*)&a->picture;
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    int size;
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    *p = *pict;
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    p->pict_type= FF_I_TYPE;
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    p->key_frame= 1;
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    emms_c();
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    align_put_bits(&a->pb);
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    while(get_bit_count(&a->pb)&31)
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        put_bits(&a->pb, 8, 0);
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    size= get_bit_count(&a->pb)/32;
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    return size*4;
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}
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#endif
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static av_cold void common_init(AVCodecContext *avctx){
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    CLJRContext * const a = avctx->priv_data;
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    avctx->coded_frame= (AVFrame*)&a->picture;
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    a->avctx= avctx;
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}
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static av_cold int decode_init(AVCodecContext *avctx){
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    common_init(avctx);
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    avctx->pix_fmt= PIX_FMT_YUV411P;
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    return 0;
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}
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#if CONFIG_CLJR_ENCODER
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static av_cold int encode_init(AVCodecContext *avctx){
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    common_init(avctx);
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    return 0;
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}
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#endif
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AVCodec ff_cljr_decoder = {
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    "cljr",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_CLJR,
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    sizeof(CLJRContext),
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    decode_init,
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    NULL,
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    NULL,
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    decode_frame,
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    CODEC_CAP_DR1,
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    .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
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};
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#if CONFIG_CLJR_ENCODER
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AVCodec ff_cljr_encoder = {
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    "cljr",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_CLJR,
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    sizeof(CLJRContext),
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    encode_init,
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    encode_frame,
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    //encode_end,
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    .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
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};
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#endif