PeerStreamer

/*

 * Cirrus Logic AccuPak (CLJR) codec

 * 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 codec.

 */

#include "avcodec.h"

#include "dsputil.h"

#include "get_bits.h"

/* Disable the encoder. */

#undef CONFIG_CLJR_ENCODER

#define CONFIG_CLJR_ENCODER 0

typedef struct CLJRContext{

    AVCodecContext *avctx;

    AVFrame picture;

    int delta[16];

    int offset[4];

    GetBitContext gb;

} CLJRContext;

static int decode_frame(AVCodecContext *avctx,

                        void *data, int *data_size,

                        AVPacket *avpkt)

{

    const uint8_t *buf = avpkt->data;

    int buf_size = avpkt->size;

    CLJRContext * const a = avctx->priv_data;

    AVFrame *picture = data;

    AVFrame * const p= (AVFrame*)&a->picture;

    int x, y;

    if(p->data[0])

        avctx->release_buffer(avctx, p);

    if(buf_size/avctx->height < avctx->width) {

        av_log(avctx, AV_LOG_ERROR, "Resolution larger than buffer size. Invalid header?\n");

        return -1;

    }

    p->reference= 0;

    if(avctx->get_buffer(avctx, p) < 0){

        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

        return -1;

    }

    p->pict_type= FF_I_TYPE;

    p->key_frame= 1;

    init_get_bits(&a->gb, buf, buf_size);

    for(y=0; y<avctx->height; y++){

        uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];

        uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];

        uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];

        for(x=0; x<avctx->width; x+=4){

                luma[3] = get_bits(&a->gb, 5) << 3;

            luma[2] = get_bits(&a->gb, 5) << 3;

            luma[1] = get_bits(&a->gb, 5) << 3;

            luma[0] = get_bits(&a->gb, 5) << 3;

            luma+= 4;

            *(cb++) = get_bits(&a->gb, 6) << 2;

            *(cr++) = get_bits(&a->gb, 6) << 2;

        }

    }

    *picture= *(AVFrame*)&a->picture;

    *data_size = sizeof(AVPicture);

    emms_c();

    return buf_size;

}

#if CONFIG_CLJR_ENCODER

static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

    CLJRContext * const a = avctx->priv_data;

    AVFrame *pict = data;

    AVFrame * const p= (AVFrame*)&a->picture;

    int size;

    *p = *pict;

    p->pict_type= FF_I_TYPE;

    p->key_frame= 1;

    emms_c();

    align_put_bits(&a->pb);

    while(get_bit_count(&a->pb)&31)

        put_bits(&a->pb, 8, 0);

    size= get_bit_count(&a->pb)/32;

    return size*4;

}

#endif

static av_cold void common_init(AVCodecContext *avctx){

    CLJRContext * const a = avctx->priv_data;

    avctx->coded_frame= (AVFrame*)&a->picture;

    a->avctx= avctx;

}

static av_cold int decode_init(AVCodecContext *avctx){

    common_init(avctx);

    avctx->pix_fmt= PIX_FMT_YUV411P;

    return 0;

}

#if CONFIG_CLJR_ENCODER

static av_cold int encode_init(AVCodecContext *avctx){

    common_init(avctx);

    return 0;

}

#endif

AVCodec ff_cljr_decoder = {

    "cljr",

    AVMEDIA_TYPE_VIDEO,

    CODEC_ID_CLJR,

    sizeof(CLJRContext),

    decode_init,

    NULL,

    NULL,

    decode_frame,

    CODEC_CAP_DR1,

    .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),

};

#if CONFIG_CLJR_ENCODER

AVCodec ff_cljr_encoder = {

    "cljr",

    AVMEDIA_TYPE_VIDEO,

    CODEC_ID_CLJR,

    sizeof(CLJRContext),

    encode_init,

    encode_frame,

    //encode_end,

    .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),

};

#endif