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     avctx->pix_fmt = PIX_FMT_YUV422P16;
  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 *data_size, AVPacket *avpkt)
  39 {
  40     int y=0;
  41     int width= avctx->width;
  42     AVFrame *pic= avctx->coded_frame;
  43     const uint32_t *src= (const uint32_t *)avpkt->data;
  44     uint16_t *ydst, *udst, *vdst, *yend;
  45
  46     if(pic->data[0])
  47         avctx->release_buffer(avctx, pic);
  48
  49     if(avpkt->size < avctx->width * avctx->height * 8 / 3){
  50         av_log(avctx, AV_LOG_ERROR, "Packet too small\n");
  51         return -1;
  52     }
  53
  54     if(avpkt->size > avctx->width * avctx->height * 8 / 3){
  55         av_log(avctx, AV_LOG_ERROR, "Probably padded data, need sample!\n");
  56     }
  57
  58     pic->reference= 0;
  59     if(avctx->get_buffer(avctx, pic) < 0)
  60         return -1;
  61
  62     ydst= (uint16_t *)pic->data[0];
  63     udst= (uint16_t *)pic->data[1];
  64     vdst= (uint16_t *)pic->data[2];
  65     yend= ydst + width;
  66     pic->pict_type= FF_I_TYPE;
  67     pic->key_frame= 1;
  68
  69     for(;;){
  70         uint32_t v= be2me_32(*src++);
  71         *udst++= (v>>16) & 0xFFC0;
  72         *ydst++= (v>>6 ) & 0xFFC0;
  73         *vdst++= (v<<4 ) & 0xFFC0;
  74
  75         v= be2me_32(*src++);
  76         *ydst++= (v>>16) & 0xFFC0;
  77
  78         if(ydst >= yend){
  79             ydst+= pic->linesize[0]/2 - width;
  80             udst+= pic->linesize[1]/2 - width/2;
  81             vdst+= pic->linesize[2]/2 - width/2;
  82             yend= ydst + width;
  83             if(++y >= avctx->height)
  84                 break;
  85         }
  86
  87         *udst++= (v>>6 ) & 0xFFC0;
  88         *ydst++= (v<<4 ) & 0xFFC0;
  89
  90         v= be2me_32(*src++);
  91         *vdst++= (v>>16) & 0xFFC0;
  92         *ydst++= (v>>6 ) & 0xFFC0;
  93
  94         if(ydst >= yend){
  95             ydst+= pic->linesize[0]/2 - width;
  96             udst+= pic->linesize[1]/2 - width/2;
  97             vdst+= pic->linesize[2]/2 - width/2;
  98             yend= ydst + width;
  99             if(++y >= avctx->height)
 100                 break;
 101         }
 102
 103         *udst++= (v<<4 ) & 0xFFC0;
 104
 105         v= be2me_32(*src++);
 106         *ydst++= (v>>16) & 0xFFC0;
 107         *vdst++= (v>>6 ) & 0xFFC0;
 108         *ydst++= (v<<4 ) & 0xFFC0;
 109         if(ydst >= yend){
 110             ydst+= pic->linesize[0]/2 - width;
 111             udst+= pic->linesize[1]/2 - width/2;
 112             vdst+= pic->linesize[2]/2 - width/2;
 113             yend= ydst + width;
 114             if(++y >= avctx->height)
 115                 break;
 116         }
 117     }
 118
 119     *data_size=sizeof(AVFrame);
 120     *(AVFrame*)data= *avctx->coded_frame;
 121
 122     return avpkt->size;
 123 }
 124
 125 static av_cold int decode_close(AVCodecContext *avctx)
 126 {
 127     AVFrame *pic = avctx->coded_frame;
 128     if (pic->data[0])
 129         avctx->release_buffer(avctx, pic);
 130     av_freep(&avctx->coded_frame);
 131
 132     return 0;
 133 }
 134
 135 AVCodec v210x_decoder = {
 136     "v210x",
 137     CODEC_TYPE_VIDEO,
 138     CODEC_ID_V210X,
 139     0,
 140     decode_init,
 141     NULL,
 142     decode_close,
 143     decode_frame,
 144     CODEC_CAP_DR1,
 145 };