PeerStreamer

/*

 * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>

 *

 * 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

 */

#include "avcodec.h"

#include "libavutil/bswap.h"

static av_cold int decode_init(AVCodecContext *avctx)

{

    if(avctx->width & 1){

        av_log(avctx, AV_LOG_ERROR, "v210x needs even width\n");

        return -1;

    }

    avctx->pix_fmt = PIX_FMT_YUV422P16;

    avctx->bits_per_raw_sample= 10;

    avctx->coded_frame= avcodec_alloc_frame();

    return 0;

}

static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)

{

    int y=0;

    int width= avctx->width;

    AVFrame *pic= avctx->coded_frame;

    const uint32_t *src= (const uint32_t *)avpkt->data;

    uint16_t *ydst, *udst, *vdst, *yend;

    if(pic->data[0])

        avctx->release_buffer(avctx, pic);

    if(avpkt->size < avctx->width * avctx->height * 8 / 3){

        av_log(avctx, AV_LOG_ERROR, "Packet too small\n");

        return -1;

    }

    if(avpkt->size > avctx->width * avctx->height * 8 / 3){

        av_log_ask_for_sample(avctx, "Probably padded data\n");

    }

    pic->reference= 0;

    if(avctx->get_buffer(avctx, pic) < 0)

        return -1;

    ydst= (uint16_t *)pic->data[0];

    udst= (uint16_t *)pic->data[1];

    vdst= (uint16_t *)pic->data[2];

    yend= ydst + width;

    pic->pict_type= AV_PICTURE_TYPE_I;

    pic->key_frame= 1;

    for(;;){

        uint32_t v= av_be2ne32(*src++);

        *udst++= (v>>16) & 0xFFC0;

        *ydst++= (v>>6 ) & 0xFFC0;

        *vdst++= (v<<4 ) & 0xFFC0;

        v= av_be2ne32(*src++);

        *ydst++= (v>>16) & 0xFFC0;

        if(ydst >= yend){

            ydst+= pic->linesize[0]/2 - width;

            udst+= pic->linesize[1]/2 - width/2;

            vdst+= pic->linesize[2]/2 - width/2;

            yend= ydst + width;

            if(++y >= avctx->height)

                break;

        }

        *udst++= (v>>6 ) & 0xFFC0;

        *ydst++= (v<<4 ) & 0xFFC0;

        v= av_be2ne32(*src++);

        *vdst++= (v>>16) & 0xFFC0;

        *ydst++= (v>>6 ) & 0xFFC0;

        if(ydst >= yend){

            ydst+= pic->linesize[0]/2 - width;

            udst+= pic->linesize[1]/2 - width/2;

            vdst+= pic->linesize[2]/2 - width/2;

            yend= ydst + width;

            if(++y >= avctx->height)

                break;

        }

        *udst++= (v<<4 ) & 0xFFC0;

        v= av_be2ne32(*src++);

        *ydst++= (v>>16) & 0xFFC0;

        *vdst++= (v>>6 ) & 0xFFC0;

        *ydst++= (v<<4 ) & 0xFFC0;

        if(ydst >= yend){

            ydst+= pic->linesize[0]/2 - width;

            udst+= pic->linesize[1]/2 - width/2;

            vdst+= pic->linesize[2]/2 - width/2;

            yend= ydst + width;

            if(++y >= avctx->height)

                break;

        }

    }

    *data_size=sizeof(AVFrame);

    *(AVFrame*)data= *avctx->coded_frame;

    return avpkt->size;

}

static av_cold int decode_close(AVCodecContext *avctx)

{

    AVFrame *pic = avctx->coded_frame;

    if (pic->data[0])

        avctx->release_buffer(avctx, pic);

    av_freep(&avctx->coded_frame);

    return 0;

}

AVCodec ff_v210x_decoder = {

    "v210x",

    AVMEDIA_TYPE_VIDEO,

    CODEC_ID_V210X,

    0,

    decode_init,

    NULL,

    decode_close,

    decode_frame,

    CODEC_CAP_DR1,

    .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),

};