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 FFmpeg.
   8  *
   9  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 "libavutil/bswap.h"
  26
  27 static av_cold int decode_init(AVCodecContext *avctx)
  28 {
  29     if (avctx->width & 1) {
  30         av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
  31         return -1;
  32     }
  33     avctx->pix_fmt             = PIX_FMT_YUV422P16;
  34     avctx->bits_per_raw_sample = 10;
  35
  36     avctx->coded_frame         = avcodec_alloc_frame();
  37
  38     return 0;
  39 }
  40
  41 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
  42                         AVPacket *avpkt)
  43 {
  44     int h, w;
  45     AVFrame *pic = avctx->coded_frame;
  46     const uint8_t *psrc = avpkt->data;
  47     uint16_t *y, *u, *v;
  48     int aligned_width = ((avctx->width + 47) / 48) * 48;
  49     int stride = aligned_width * 8 / 3;
  50
  51     if (pic->data[0])
  52         avctx->release_buffer(avctx, pic);
  53
  54     if (avpkt->size < stride * avctx->height) {
  55         av_log(avctx, AV_LOG_ERROR, "packet too small\n");
  56         return -1;
  57     }
  58
  59     pic->reference = 0;
  60     if (avctx->get_buffer(avctx, pic) < 0)
  61         return -1;
  62
  63     y = (uint16_t*)pic->data[0];
  64     u = (uint16_t*)pic->data[1];
  65     v = (uint16_t*)pic->data[2];
  66     pic->pict_type = FF_I_TYPE;
  67     pic->key_frame = 1;
  68
  69 #define READ_PIXELS(a, b, c)         \
  70     do {                             \
  71         val  = le2me_32(*src++);     \
  72         *a++ =  val <<  6;           \
  73         *b++ = (val >>  4) & 0xFFC0; \
  74         *c++ = (val >> 14) & 0xFFC0; \
  75     } while (0)
  76
  77     for (h = 0; h < avctx->height; h++) {
  78         const uint32_t *src = (const uint32_t*)psrc;
  79         uint32_t val;
  80         for (w = 0; w < avctx->width - 5; w += 6) {
  81             READ_PIXELS(u, y, v);
  82             READ_PIXELS(y, u, y);
  83             READ_PIXELS(v, y, u);
  84             READ_PIXELS(y, v, y);
  85         }
  86         if (w < avctx->width - 1) {
  87             READ_PIXELS(u, y, v);
  88
  89             val  = le2me_32(*src++);
  90             *y++ =  val <<  6;
  91         }
  92         if (w < avctx->width - 3) {
  93             *u++ = (val >>  4) & 0xFFC0;
  94             *y++ = (val >> 14) & 0xFFC0;
  95
  96             val  = le2me_32(*src++);
  97             *v++ =  val <<  6;
  98             *y++ = (val >>  4) & 0xFFC0;
  99         }
 100
 101         psrc += stride;
 102         y += pic->linesize[0] / 2 - avctx->width;
 103         u += pic->linesize[1] / 2 - avctx->width / 2;
 104         v += pic->linesize[2] / 2 - avctx->width / 2;
 105     }
 106
 107     *data_size = sizeof(AVFrame);
 108     *(AVFrame*)data = *avctx->coded_frame;
 109
 110     return avpkt->size;
 111 }
 112
 113 static av_cold int decode_close(AVCodecContext *avctx)
 114 {
 115     AVFrame *pic = avctx->coded_frame;
 116     if (pic->data[0])
 117         avctx->release_buffer(avctx, pic);
 118     av_freep(&avctx->coded_frame);
 119
 120     return 0;
 121 }
 122
 123 AVCodec v210_decoder = {
 124     "v210",
 125     CODEC_TYPE_VIDEO,
 126     CODEC_ID_V210,
 127     0,
 128     decode_init,
 129     NULL,
 130     decode_close,
 131     decode_frame,
 132     CODEC_CAP_DR1,
 133     .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
 134 };