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  1. /*
  2.  * y41p decoder
  3.  *
  4.  * Copyright (c) 2012 Paul B Mahol
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include "avcodec.h"
  24. #include "internal.h"
  25.  
  26. static av_cold int y41p_decode_init(AVCodecContext *avctx)
  27. {
  28.     avctx->pix_fmt             = AV_PIX_FMT_YUV411P;
  29.     avctx->bits_per_raw_sample = 12;
  30.  
  31.     if (avctx->width & 7) {
  32.         av_log(avctx, AV_LOG_WARNING, "y41p requires width to be divisible by 8.\n");
  33.     }
  34.  
  35.     return 0;
  36. }
  37.  
  38. static int y41p_decode_frame(AVCodecContext *avctx, void *data,
  39.                              int *got_frame, AVPacket *avpkt)
  40. {
  41.     AVFrame *pic = data;
  42.     uint8_t *src = avpkt->data;
  43.     uint8_t *y, *u, *v;
  44.     int i, j, ret;
  45.  
  46.     if (avpkt->size < 1.5 * avctx->height * avctx->width) {
  47.         av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
  48.         return AVERROR(EINVAL);
  49.     }
  50.  
  51.     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
  52.         return ret;
  53.  
  54.     pic->key_frame = 1;
  55.     pic->pict_type = AV_PICTURE_TYPE_I;
  56.  
  57.     for (i = avctx->height - 1; i >= 0 ; i--) {
  58.         y = &pic->data[0][i * pic->linesize[0]];
  59.         u = &pic->data[1][i * pic->linesize[1]];
  60.         v = &pic->data[2][i * pic->linesize[2]];
  61.         for (j = 0; j < avctx->width; j += 8) {
  62.             *(u++) = *src++;
  63.             *(y++) = *src++;
  64.             *(v++) = *src++;
  65.             *(y++) = *src++;
  66.  
  67.             *(u++) = *src++;
  68.             *(y++) = *src++;
  69.             *(v++) = *src++;
  70.             *(y++) = *src++;
  71.  
  72.             *(y++) = *src++;
  73.             *(y++) = *src++;
  74.             *(y++) = *src++;
  75.             *(y++) = *src++;
  76.         }
  77.     }
  78.  
  79.     *got_frame = 1;
  80.  
  81.     return avpkt->size;
  82. }
  83.  
  84. AVCodec ff_y41p_decoder = {
  85.     .name         = "y41p",
  86.     .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"),
  87.     .type         = AVMEDIA_TYPE_VIDEO,
  88.     .id           = AV_CODEC_ID_Y41P,
  89.     .init         = y41p_decode_init,
  90.     .decode       = y41p_decode_frame,
  91.     .capabilities = CODEC_CAP_DR1,
  92. };
  93.