ffmpeg/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 "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 };