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ffmpeg / libavcodec / r210dec.c @ 72415b2a

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/*
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 * R210 decoder
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 *
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 * Copyright (c) 2009 Reimar Doeffinger <Reimar.Doeffinger@gmx.de>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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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#include "avcodec.h"
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#include "libavutil/bswap.h"
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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    avctx->pix_fmt             = PIX_FMT_RGB48;
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    avctx->bits_per_raw_sample = 10;
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    avctx->coded_frame         = avcodec_alloc_frame();
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    return 0;
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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                        AVPacket *avpkt)
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{
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    int h, w;
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    AVFrame *pic = avctx->coded_frame;
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    const uint32_t *src = (const uint32_t *)avpkt->data;
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    int aligned_width = FFALIGN(avctx->width, 64);
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    uint8_t *dst_line;
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    if (pic->data[0])
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        avctx->release_buffer(avctx, pic);
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    if (avpkt->size < 4 * aligned_width * avctx->height) {
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        av_log(avctx, AV_LOG_ERROR, "packet too small\n");
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        return -1;
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    }
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    pic->reference = 0;
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    if (avctx->get_buffer(avctx, pic) < 0)
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        return -1;
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    pic->pict_type = FF_I_TYPE;
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    pic->key_frame = 1;
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    dst_line = pic->data[0];
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    for (h = 0; h < avctx->height; h++) {
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        uint16_t *dst = (uint16_t *)dst_line;
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        for (w = 0; w < avctx->width; w++) {
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            uint32_t pixel = be2me_32(*src++);
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            uint16_t r, g, b;
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            b =  pixel <<  6;
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            g = (pixel >>  4) & 0xffc0;
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            r = (pixel >> 14) & 0xffc0;
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            *dst++ = r | (r >> 10);
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            *dst++ = g | (g >> 10);
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            *dst++ = b | (b >> 10);
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        }
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        src += aligned_width - avctx->width;
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        dst_line += pic->linesize[0];
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    }
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    *data_size = sizeof(AVFrame);
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    *(AVFrame*)data = *avctx->coded_frame;
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    return avpkt->size;
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}
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static av_cold int decode_close(AVCodecContext *avctx)
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{
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    AVFrame *pic = avctx->coded_frame;
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    if (pic->data[0])
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        avctx->release_buffer(avctx, pic);
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    av_freep(&avctx->coded_frame);
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    return 0;
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}
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AVCodec r210_decoder = {
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    "r210",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_R210,
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    0,
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    decode_init,
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    NULL,
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    decode_close,
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    decode_frame,
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    CODEC_CAP_DR1,
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    .long_name = NULL_IF_CONFIG_SMALL("Uncompressed RGB 10-bit"),
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};