/*
  * libquicktime yuv4 encoder
  *
  * Copyright (c) 2011 Carl Eugen Hoyos
  *
  * 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 yuv4_encode_init(AVCodecContext *avctx)
 {

     avctx->coded_frame = av_frame_alloc();

 
     if (!avctx->coded_frame) {
         av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
         return AVERROR(ENOMEM);
     }
 
     return 0;
 }
 

 static int yuv4_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                              const AVFrame *pic, int *got_packet)

 {

     uint8_t *dst;

     uint8_t *y, *u, *v;

     int i, j, ret;

     if ((ret = ff_alloc_packet2(avctx, pkt, 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1))) < 0)

         return ret;
     dst = pkt->data;

 
     avctx->coded_frame->key_frame = 1;

     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;

 
     y = pic->data[0];
     u = pic->data[1];
     v = pic->data[2];
 
     for (i = 0; i < avctx->height + 1 >> 1; i++) {
         for (j = 0; j < avctx->width + 1 >> 1; j++) {
             *dst++ = u[j] ^ 0x80;
             *dst++ = v[j] ^ 0x80;
             *dst++ = y[                   2 * j    ];
             *dst++ = y[                   2 * j + 1];
             *dst++ = y[pic->linesize[0] + 2 * j    ];
             *dst++ = y[pic->linesize[0] + 2 * j + 1];
         }
         y += 2 * pic->linesize[0];
         u +=     pic->linesize[1];
         v +=     pic->linesize[2];
     }
 

     pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;
     return 0;

 }
 
 static av_cold int yuv4_encode_close(AVCodecContext *avctx)
 {
     av_freep(&avctx->coded_frame);
 
     return 0;
 }
 
 AVCodec ff_yuv4_encoder = {
     .name         = "yuv4",

     .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),

     .type         = AVMEDIA_TYPE_VIDEO,

     .id           = AV_CODEC_ID_YUV4,

     .init         = yuv4_encode_init,

     .encode2      = yuv4_encode_frame,

     .close        = yuv4_encode_close,

     .pix_fmts     = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },

 };