libavcodec/v210x.c

   1 /*
   2  * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "avcodec.h"
  22 #include "libavutil/bswap.h"
  23
  24 static av_cold int decode_init(AVCodecContext *avctx)
  25 {
  26     if(avctx->width & 1){
  27         av_log(avctx, AV_LOG_ERROR, "v210x needs even width\n");
  28         return -1;
  29     }
  30     if(avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0)
  31         return -1;
  32     avctx->pix_fmt = PIX_FMT_YUV422P16;
  33     avctx->bits_per_raw_sample= 10;
  34
  35     avctx->coded_frame= avcodec_alloc_frame();
  36
  37     return 0;
  38 }
  39
  40 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
  41 {
  42     int y=0;
  43     int width= avctx->width;
  44     AVFrame *pic= avctx->coded_frame;
  45     const uint32_t *src= (const uint32_t *)avpkt->data;
  46     uint16_t *ydst, *udst, *vdst, *yend;
  47
  48     if(pic->data[0])
  49         avctx->release_buffer(avctx, pic);
  50
  51     if(avpkt->size < avctx->width * avctx->height * 8 / 3){
  52         av_log(avctx, AV_LOG_ERROR, "Packet too small\n");
  53         return -1;
  54     }
  55
  56     if(avpkt->size > avctx->width * avctx->height * 8 / 3){
  57         av_log(avctx, AV_LOG_ERROR, "Probably padded data, need sample!\n");
  58     }
  59
  60     pic->reference= 0;
  61     if(avctx->get_buffer(avctx, pic) < 0)
  62         return -1;
  63
  64     ydst= (uint16_t *)pic->data[0];
  65     udst= (uint16_t *)pic->data[1];
  66     vdst= (uint16_t *)pic->data[2];
  67     yend= ydst + width;
  68     pic->pict_type= FF_I_TYPE;
  69     pic->key_frame= 1;
  70
  71     for(;;){
  72         uint32_t v= be2me_32(*src++);
  73         *udst++= (v>>16) & 0xFFC0;
  74         *ydst++= (v>>6 ) & 0xFFC0;
  75         *vdst++= (v<<4 ) & 0xFFC0;
  76
  77         v= be2me_32(*src++);
  78         *ydst++= (v>>16) & 0xFFC0;
  79
  80         if(ydst >= yend){
  81             ydst+= pic->linesize[0]/2 - width;
  82             udst+= pic->linesize[1]/2 - width/2;
  83             vdst+= pic->linesize[2]/2 - width/2;
  84             yend= ydst + width;
  85             if(++y >= avctx->height)
  86                 break;
  87         }
  88
  89         *udst++= (v>>6 ) & 0xFFC0;
  90         *ydst++= (v<<4 ) & 0xFFC0;
  91
  92         v= be2me_32(*src++);
  93         *vdst++= (v>>16) & 0xFFC0;
  94         *ydst++= (v>>6 ) & 0xFFC0;
  95
  96         if(ydst >= yend){
  97             ydst+= pic->linesize[0]/2 - width;
  98             udst+= pic->linesize[1]/2 - width/2;
  99             vdst+= pic->linesize[2]/2 - width/2;
 100             yend= ydst + width;
 101             if(++y >= avctx->height)
 102                 break;
 103         }
 104
 105         *udst++= (v<<4 ) & 0xFFC0;
 106
 107         v= be2me_32(*src++);
 108         *ydst++= (v>>16) & 0xFFC0;
 109         *vdst++= (v>>6 ) & 0xFFC0;
 110         *ydst++= (v<<4 ) & 0xFFC0;
 111         if(ydst >= yend){
 112             ydst+= pic->linesize[0]/2 - width;
 113             udst+= pic->linesize[1]/2 - width/2;
 114             vdst+= pic->linesize[2]/2 - width/2;
 115             yend= ydst + width;
 116             if(++y >= avctx->height)
 117                 break;
 118         }
 119     }
 120
 121     *data_size=sizeof(AVFrame);
 122     *(AVFrame*)data= *avctx->coded_frame;
 123
 124     return avpkt->size;
 125 }
 126
 127 AVCodec v210x_decoder = {
 128     "v210x",
 129     CODEC_TYPE_VIDEO,
 130     CODEC_ID_V210X,
 131     0,
 132     decode_init,
 133     NULL,
 134     NULL,
 135     decode_frame,
 136     CODEC_CAP_DR1,
 137 };