libavcodec/v210dec.c

   1 /*
   2  * V210 decoder
   3  *
   4  * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
   5  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
   6  *
   7  * This file is part of Libav.
   8  *
   9  * Libav is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * Libav is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with Libav; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include "avcodec.h"
  25 #include "internal.h"
  26 #include "libavutil/bswap.h"
  27 #include "libavutil/internal.h"
  28 #include "libavutil/mem.h"
  29
  30 static av_cold int decode_init(AVCodecContext *avctx)
  31 {
  32     if (avctx->width & 1) {
  33         av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
  34         return AVERROR_INVALIDDATA;
  35     }
  36     avctx->pix_fmt             = AV_PIX_FMT_YUV422P10;
  37     avctx->bits_per_raw_sample = 10;
  38
  39     return 0;
  40 }
  41
  42 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
  43                         AVPacket *avpkt)
  44 {
  45     int h, w, ret;
  46     AVFrame *pic = data;
  47     const uint8_t *psrc = avpkt->data;
  48     uint16_t *y, *u, *v;
  49     int aligned_width = ((avctx->width + 47) / 48) * 48;
  50     int stride = aligned_width * 8 / 3;
  51
  52     if (avpkt->size < stride * avctx->height) {
  53         av_log(avctx, AV_LOG_ERROR, "packet too small\n");
  54         return AVERROR_INVALIDDATA;
  55     }
  56
  57     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
  58         return ret;
  59
  60     y = (uint16_t*)pic->data[0];
  61     u = (uint16_t*)pic->data[1];
  62     v = (uint16_t*)pic->data[2];
  63     pic->pict_type = AV_PICTURE_TYPE_I;
  64     pic->key_frame = 1;
  65
  66 #define READ_PIXELS(a, b, c)         \
  67     do {                             \
  68         val  = av_le2ne32(*src++);   \
  69         *a++ =  val & 0x3FF;         \
  70         *b++ = (val >> 10) & 0x3FF;  \
  71         *c++ = (val >> 20) & 0x3FF;  \
  72     } while (0)
  73
  74     for (h = 0; h < avctx->height; h++) {
  75         const uint32_t *src = (const uint32_t*)psrc;
  76         uint32_t val;
  77         for (w = 0; w < avctx->width - 5; w += 6) {
  78             READ_PIXELS(u, y, v);
  79             READ_PIXELS(y, u, y);
  80             READ_PIXELS(v, y, u);
  81             READ_PIXELS(y, v, y);
  82         }
  83         if (w < avctx->width - 1) {
  84             READ_PIXELS(u, y, v);
  85
  86             val  = av_le2ne32(*src++);
  87             *y++ =  val & 0x3FF;
  88         }
  89         if (w < avctx->width - 3) {
  90             *u++ = (val >> 10) & 0x3FF;
  91             *y++ = (val >> 20) & 0x3FF;
  92
  93             val  = av_le2ne32(*src++);
  94             *v++ =  val & 0x3FF;
  95             *y++ = (val >> 10) & 0x3FF;
  96         }
  97
  98         psrc += stride;
  99         y += pic->linesize[0] / 2 - avctx->width;
 100         u += pic->linesize[1] / 2 - avctx->width / 2;
 101         v += pic->linesize[2] / 2 - avctx->width / 2;
 102     }
 103
 104     *got_frame      = 1;
 105
 106     return avpkt->size;
 107 }
 108
 109 AVCodec ff_v210_decoder = {
 110     .name           = "v210",
 111     .type           = AVMEDIA_TYPE_VIDEO,
 112     .id             = AV_CODEC_ID_V210,
 113     .init           = decode_init,
 114     .decode         = decode_frame,
 115     .capabilities   = CODEC_CAP_DR1,
 116     .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
 117 };