/*
  * y41p decoder
  *
  * Copyright (c) 2012 Paul B Mahol
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "avcodec.h"

 #include "internal.h"

 
 static av_cold int y41p_decode_init(AVCodecContext *avctx)
 {

     avctx->pix_fmt             = AV_PIX_FMT_YUV411P;

     avctx->bits_per_raw_sample = 12;
 
     if (avctx->width & 7) {
         av_log(avctx, AV_LOG_WARNING, "y41p requires width to be divisible by 8.\n");
     }
 
     return 0;
 }
 
 static int y41p_decode_frame(AVCodecContext *avctx, void *data,

                              int *got_frame, AVPacket *avpkt)

 {

     AVFrame *pic = data;

     uint8_t *src = avpkt->data;
     uint8_t *y, *u, *v;

     int i, j, ret;

     if (avpkt->size < 3LL * avctx->height * avctx->width / 2) {

         av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
         return AVERROR(EINVAL);
     }
 

     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
         return ret;

 
     pic->key_frame = 1;

     pic->pict_type = AV_PICTURE_TYPE_I;

 
     for (i = avctx->height - 1; i >= 0 ; i--) {
         y = &pic->data[0][i * pic->linesize[0]];
         u = &pic->data[1][i * pic->linesize[1]];
         v = &pic->data[2][i * pic->linesize[2]];
         for (j = 0; j < avctx->width; j += 8) {
             *(u++) = *src++;
             *(y++) = *src++;
             *(v++) = *src++;
             *(y++) = *src++;
 
             *(u++) = *src++;
             *(y++) = *src++;
             *(v++) = *src++;
             *(y++) = *src++;
 
             *(y++) = *src++;
             *(y++) = *src++;
             *(y++) = *src++;
             *(y++) = *src++;
         }
     }
 

     *got_frame = 1;

 
     return avpkt->size;
 }
 
 AVCodec ff_y41p_decoder = {
     .name         = "y41p",

     .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"),

     .type         = AVMEDIA_TYPE_VIDEO,

     .id           = AV_CODEC_ID_Y41P,

     .init         = y41p_decode_init,
     .decode       = y41p_decode_frame,

     .capabilities = AV_CODEC_CAP_DR1,

 };