libavcodec/r210dec.c

   1 /*
   2  * R210 decoder
   3  *
   4  * Copyright (c) 2009 Reimar Doeffinger <Reimar.Doeffinger@gmx.de>
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * Libav is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "avcodec.h"
  24 #include "internal.h"
  25 #include "libavutil/bswap.h"
  26 #include "libavutil/common.h"
  27
  28 static av_cold int decode_init(AVCodecContext *avctx)
  29 {
  30     avctx->pix_fmt             = AV_PIX_FMT_RGB48;
  31     avctx->bits_per_raw_sample = 10;
  32
  33     avctx->coded_frame         = avcodec_alloc_frame();
  34
  35     return 0;
  36 }
  37
  38 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
  39                         AVPacket *avpkt)
  40 {
  41     int h, w, ret;
  42     AVFrame *pic = avctx->coded_frame;
  43     const uint32_t *src = (const uint32_t *)avpkt->data;
  44     int aligned_width = FFALIGN(avctx->width, 64);
  45     uint8_t *dst_line;
  46
  47     if (pic->data[0])
  48         avctx->release_buffer(avctx, pic);
  49
  50     if (avpkt->size < 4 * aligned_width * avctx->height) {
  51         av_log(avctx, AV_LOG_ERROR, "packet too small\n");
  52         return AVERROR_INVALIDDATA;
  53     }
  54
  55     pic->reference = 0;
  56     if ((ret = ff_get_buffer(avctx, pic)) < 0)
  57         return ret;
  58
  59     pic->pict_type = AV_PICTURE_TYPE_I;
  60     pic->key_frame = 1;
  61     dst_line = pic->data[0];
  62
  63     for (h = 0; h < avctx->height; h++) {
  64         uint16_t *dst = (uint16_t *)dst_line;
  65         for (w = 0; w < avctx->width; w++) {
  66             uint32_t pixel = av_be2ne32(*src++);
  67             uint16_t r, g, b;
  68             if (avctx->codec_id==AV_CODEC_ID_R210) {
  69                 b =  pixel <<  6;
  70                 g = (pixel >>  4) & 0xffc0;
  71                 r = (pixel >> 14) & 0xffc0;
  72             } else {
  73                 b =  pixel <<  4;
  74                 g = (pixel >>  6) & 0xffc0;
  75                 r = (pixel >> 16) & 0xffc0;
  76             }
  77             *dst++ = r | (r >> 10);
  78             *dst++ = g | (g >> 10);
  79             *dst++ = b | (b >> 10);
  80         }
  81         src += aligned_width - avctx->width;
  82         dst_line += pic->linesize[0];
  83     }
  84
  85     *got_frame      = 1;
  86     *(AVFrame*)data = *avctx->coded_frame;
  87
  88     return avpkt->size;
  89 }
  90
  91 static av_cold int decode_close(AVCodecContext *avctx)
  92 {
  93     AVFrame *pic = avctx->coded_frame;
  94     if (pic->data[0])
  95         avctx->release_buffer(avctx, pic);
  96     av_freep(&avctx->coded_frame);
  97
  98     return 0;
  99 }
 100
 101 #if CONFIG_R210_DECODER
 102 AVCodec ff_r210_decoder = {
 103     .name           = "r210",
 104     .type           = AVMEDIA_TYPE_VIDEO,
 105     .id             = AV_CODEC_ID_R210,
 106     .init           = decode_init,
 107     .close          = decode_close,
 108     .decode         = decode_frame,
 109     .capabilities   = CODEC_CAP_DR1,
 110     .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed RGB 10-bit"),
 111 };
 112 #endif
 113 #if CONFIG_R10K_DECODER
 114 AVCodec ff_r10k_decoder = {
 115     .name           = "r10k",
 116     .type           = AVMEDIA_TYPE_VIDEO,
 117     .id             = AV_CODEC_ID_R10K,
 118     .init           = decode_init,
 119     .close          = decode_close,
 120     .decode         = decode_frame,
 121     .capabilities   = CODEC_CAP_DR1,
 122     .long_name      = NULL_IF_CONFIG_SMALL("AJA Kona 10-bit RGB Codec"),
 123 };
 124 #endif