PeerStreamer

/*

 * R210 decoder

 *

 * Copyright (c) 2009 Reimar Doeffinger <Reimar.Doeffinger@gmx.de>

 *

 * This file is part of Libav.

 *

 * Libav 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.

 *

 * Libav 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 Libav; 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)

{

    avctx->pix_fmt             = PIX_FMT_RGB48;

    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 h, w;

    AVFrame *pic = avctx->coded_frame;

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

    int aligned_width = FFALIGN(avctx->width, 64);

    uint8_t *dst_line;

    if (pic->data[0])

        avctx->release_buffer(avctx, pic);

    if (avpkt->size < 4 * aligned_width * avctx->height) {

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

        return -1;

    }

    pic->reference = 0;

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

        return -1;

    pic->pict_type = FF_I_TYPE;

    pic->key_frame = 1;

    dst_line = pic->data[0];

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

        uint16_t *dst = (uint16_t *)dst_line;

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

            uint32_t pixel = av_be2ne32(*src++);

            uint16_t r, g, b;

            if (avctx->codec_id==CODEC_ID_R210) {

                b =  pixel <<  6;

                g = (pixel >>  4) & 0xffc0;

                r = (pixel >> 14) & 0xffc0;

            } else {

                b =  pixel <<  4;

                g = (pixel >>  6) & 0xffc0;

                r = (pixel >> 16) & 0xffc0;

            }

            *dst++ = r | (r >> 10);

            *dst++ = g | (g >> 10);

            *dst++ = b | (b >> 10);

        }

        src += aligned_width - avctx->width;

        dst_line += pic->linesize[0];

    }

    *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;

}

#if CONFIG_R210_DECODER

AVCodec ff_r210_decoder = {

    "r210",

    AVMEDIA_TYPE_VIDEO,

    CODEC_ID_R210,

    0,

    decode_init,

    NULL,

    decode_close,

    decode_frame,

    CODEC_CAP_DR1,

    .long_name = NULL_IF_CONFIG_SMALL("Uncompressed RGB 10-bit"),

};

#endif

#if CONFIG_R10K_DECODER

AVCodec ff_r10k_decoder = {

    "r10k",

    AVMEDIA_TYPE_VIDEO,

    CODEC_ID_R10K,

    0,

    decode_init,

    NULL,

    decode_close,

    decode_frame,

    CODEC_CAP_DR1,

    .long_name = NULL_IF_CONFIG_SMALL("AJA Kona 10-bit RGB Codec"),

};

#endif