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  1. /*
  2.  * Pinnacle TARGA CineWave YUV16 decoder
  3.  * Copyright (c) 2012 Carl Eugen Hoyos
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "avcodec.h"
  23. #include "internal.h"
  24.  
  25. static av_cold int y216_decode_init(AVCodecContext *avctx)
  26. {
  27.     avctx->pix_fmt             = AV_PIX_FMT_YUV422P16;
  28.     avctx->bits_per_raw_sample = 14;
  29.  
  30.     return 0;
  31. }
  32.  
  33. static int y216_decode_frame(AVCodecContext *avctx, void *data,
  34.                              int *got_frame, AVPacket *avpkt)
  35. {
  36.     AVFrame *pic = data;
  37.     const uint16_t *src = (uint16_t *)avpkt->data;
  38.     uint16_t *y, *u, *v, aligned_width = FFALIGN(avctx->width, 4);
  39.     int i, j, ret;
  40.  
  41.     if (avpkt->size < 4 * avctx->height * aligned_width) {
  42.         av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
  43.         return AVERROR(EINVAL);
  44.     }
  45.  
  46.     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
  47.         return ret;
  48.  
  49.     pic->key_frame = 1;
  50.     pic->pict_type = AV_PICTURE_TYPE_I;
  51.  
  52.     y = (uint16_t *)pic->data[0];
  53.     u = (uint16_t *)pic->data[1];
  54.     v = (uint16_t *)pic->data[2];
  55.  
  56.     for (i = 0; i < avctx->height; i++) {
  57.         for (j = 0; j < avctx->width >> 1; j++) {
  58.             u[    j    ] = src[4 * j    ] << 2 | src[4 * j    ] >> 14;
  59.             y[2 * j    ] = src[4 * j + 1] << 2 | src[4 * j + 1] >> 14;
  60.             v[    j    ] = src[4 * j + 2] << 2 | src[4 * j + 2] >> 14;
  61.             y[2 * j + 1] = src[4 * j + 3] << 2 | src[4 * j + 3] >> 14;
  62.         }
  63.  
  64.         y += pic->linesize[0] >> 1;
  65.         u += pic->linesize[1] >> 1;
  66.         v += pic->linesize[2] >> 1;
  67.         src += aligned_width << 1;
  68.     }
  69.  
  70.     *got_frame = 1;
  71.  
  72.     return avpkt->size;
  73. }
  74.  
  75. AVCodec ff_targa_y216_decoder = {
  76.     .name         = "targa_y216",
  77.     .long_name    = NULL_IF_CONFIG_SMALL("Pinnacle TARGA CineWave YUV16"),
  78.     .type         = AVMEDIA_TYPE_VIDEO,
  79.     .id           = AV_CODEC_ID_TARGA_Y216,
  80.     .init         = y216_decode_init,
  81.     .decode       = y216_decode_frame,
  82.     .capabilities = CODEC_CAP_DR1,
  83. };
  84.