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  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 "internal.h"
  23. #include "libavutil/bswap.h"
  24. #include "libavutil/internal.h"
  25. #include "libavutil/mem.h"
  26.  
  27. static av_cold int decode_init(AVCodecContext *avctx)
  28. {
  29.     if (avctx->width & 1) {
  30.         av_log(avctx, AV_LOG_ERROR, "v210x needs even width\n");
  31.         return AVERROR(EINVAL);
  32.     }
  33.     avctx->pix_fmt             = AV_PIX_FMT_YUV422P16;
  34.     avctx->bits_per_raw_sample = 10;
  35.  
  36.     return 0;
  37. }
  38.  
  39. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
  40.                         AVPacket *avpkt)
  41. {
  42.     const uint32_t *src = (const uint32_t *)avpkt->data;
  43.     AVFrame *pic        = data;
  44.     int width           = avctx->width;
  45.     int y               = 0;
  46.     uint16_t *ydst, *udst, *vdst, *yend;
  47.     int ret;
  48.  
  49.     if (avpkt->size < avctx->width * avctx->height * 8 / 3) {
  50.         av_log(avctx, AV_LOG_ERROR, "Packet too small\n");
  51.         return AVERROR_INVALIDDATA;
  52.     }
  53.  
  54.     if (avpkt->size > avctx->width * avctx->height * 8 / 3) {
  55.         avpriv_request_sample(avctx, "(Probably) padded data");
  56.     }
  57.  
  58.     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
  59.         return ret;
  60.  
  61.     ydst = (uint16_t *)pic->data[0];
  62.     udst = (uint16_t *)pic->data[1];
  63.     vdst = (uint16_t *)pic->data[2];
  64.     yend = ydst + width;
  65.     pic->pict_type = AV_PICTURE_TYPE_I;
  66.     pic->key_frame = 1;
  67.  
  68.     for (;;) {
  69.         uint32_t v = av_be2ne32(*src++);
  70.         *udst++ = (v >> 16) & 0xFFC0;
  71.         *ydst++ = (v >> 6 ) & 0xFFC0;
  72.         *vdst++ = (v << 4 ) & 0xFFC0;
  73.  
  74.         v       = av_be2ne32(*src++);
  75.         *ydst++ = (v >> 16) & 0xFFC0;
  76.  
  77.         if (ydst >= yend) {
  78.             ydst += pic->linesize[0] / 2 - width;
  79.             udst += pic->linesize[1] / 2 - width / 2;
  80.             vdst += pic->linesize[2] / 2 - width / 2;
  81.             yend = ydst + width;
  82.             if (++y >= avctx->height)
  83.                 break;
  84.         }
  85.  
  86.         *udst++ = (v >> 6 ) & 0xFFC0;
  87.         *ydst++ = (v << 4 ) & 0xFFC0;
  88.  
  89.         v = av_be2ne32(*src++);
  90.         *vdst++ = (v >> 16) & 0xFFC0;
  91.         *ydst++ = (v >> 6 ) & 0xFFC0;
  92.  
  93.         if (ydst >= yend) {
  94.             ydst += pic->linesize[0] / 2 - width;
  95.             udst += pic->linesize[1] / 2 - width / 2;
  96.             vdst += pic->linesize[2] / 2 - width / 2;
  97.             yend  = ydst + width;
  98.             if (++y >= avctx->height)
  99.                 break;
  100.         }
  101.  
  102.         *udst++ = (v << 4 ) & 0xFFC0;
  103.  
  104.         v = av_be2ne32(*src++);
  105.         *ydst++ = (v >> 16) & 0xFFC0;
  106.         *vdst++ = (v >> 6 ) & 0xFFC0;
  107.         *ydst++ = (v << 4 ) & 0xFFC0;
  108.         if (ydst >= yend) {
  109.             ydst += pic->linesize[0] / 2 - width;
  110.             udst += pic->linesize[1] / 2 - width / 2;
  111.             vdst += pic->linesize[2] / 2 - width / 2;
  112.             yend  = ydst + width;
  113.             if (++y >= avctx->height)
  114.                 break;
  115.         }
  116.     }
  117.  
  118.     *got_frame = 1;
  119.  
  120.     return avpkt->size;
  121. }
  122.  
  123. AVCodec ff_v210x_decoder = {
  124.     .name           = "v210x",
  125.     .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
  126.     .type           = AVMEDIA_TYPE_VIDEO,
  127.     .id             = AV_CODEC_ID_V210X,
  128.     .init           = decode_init,
  129.     .decode         = decode_frame,
  130.     .capabilities   = CODEC_CAP_DR1,
  131. };
  132.