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  1. /*
  2.  * libquicktime yuv4 encoder
  3.  *
  4.  * Copyright (c) 2011 Carl Eugen Hoyos
  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 yuv4_encode_init(AVCodecContext *avctx)
  27. {
  28.     return 0;
  29. }
  30.  
  31. static int yuv4_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  32.                              const AVFrame *pic, int *got_packet)
  33. {
  34.     uint8_t *dst;
  35.     uint8_t *y, *u, *v;
  36.     int i, j, ret;
  37.  
  38.     if ((ret = ff_alloc_packet2(avctx, pkt, 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1), 0)) < 0)
  39.         return ret;
  40.     dst = pkt->data;
  41.  
  42.     y = pic->data[0];
  43.     u = pic->data[1];
  44.     v = pic->data[2];
  45.  
  46.     for (i = 0; i < avctx->height + 1 >> 1; i++) {
  47.         for (j = 0; j < avctx->width + 1 >> 1; j++) {
  48.             *dst++ = u[j] ^ 0x80;
  49.             *dst++ = v[j] ^ 0x80;
  50.             *dst++ = y[                   2 * j    ];
  51.             *dst++ = y[                   2 * j + 1];
  52.             *dst++ = y[pic->linesize[0] + 2 * j    ];
  53.             *dst++ = y[pic->linesize[0] + 2 * j + 1];
  54.         }
  55.         y += 2 * pic->linesize[0];
  56.         u +=     pic->linesize[1];
  57.         v +=     pic->linesize[2];
  58.     }
  59.  
  60.     pkt->flags |= AV_PKT_FLAG_KEY;
  61.     *got_packet = 1;
  62.     return 0;
  63. }
  64.  
  65. static av_cold int yuv4_encode_close(AVCodecContext *avctx)
  66. {
  67.     return 0;
  68. }
  69.  
  70. AVCodec ff_yuv4_encoder = {
  71.     .name         = "yuv4",
  72.     .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),
  73.     .type         = AVMEDIA_TYPE_VIDEO,
  74.     .id           = AV_CODEC_ID_YUV4,
  75.     .init         = yuv4_encode_init,
  76.     .encode2      = yuv4_encode_frame,
  77.     .close        = yuv4_encode_close,
  78.     .pix_fmts     = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
  79.     .capabilities = AV_CODEC_CAP_INTRA_ONLY,
  80. };
  81.