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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.     avctx->coded_frame = avcodec_alloc_frame();
  29.  
  30.     if (!avctx->coded_frame) {
  31.         av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
  32.         return AVERROR(ENOMEM);
  33.     }
  34.  
  35.     return 0;
  36. }
  37.  
  38. static int yuv4_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  39.                              const AVFrame *pic, int *got_packet)
  40. {
  41.     uint8_t *dst;
  42.     uint8_t *y, *u, *v;
  43.     int i, j, ret;
  44.  
  45.     if ((ret = ff_alloc_packet2(avctx, pkt, 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1))) < 0)
  46.         return ret;
  47.     dst = pkt->data;
  48.  
  49.     avctx->coded_frame->key_frame = 1;
  50.     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
  51.  
  52.     y = pic->data[0];
  53.     u = pic->data[1];
  54.     v = pic->data[2];
  55.  
  56.     for (i = 0; i < avctx->height + 1 >> 1; i++) {
  57.         for (j = 0; j < avctx->width + 1 >> 1; j++) {
  58.             *dst++ = u[j] ^ 0x80;
  59.             *dst++ = v[j] ^ 0x80;
  60.             *dst++ = y[                   2 * j    ];
  61.             *dst++ = y[                   2 * j + 1];
  62.             *dst++ = y[pic->linesize[0] + 2 * j    ];
  63.             *dst++ = y[pic->linesize[0] + 2 * j + 1];
  64.         }
  65.         y += 2 * pic->linesize[0];
  66.         u +=     pic->linesize[1];
  67.         v +=     pic->linesize[2];
  68.     }
  69.  
  70.     pkt->flags |= AV_PKT_FLAG_KEY;
  71.     *got_packet = 1;
  72.     return 0;
  73. }
  74.  
  75. static av_cold int yuv4_encode_close(AVCodecContext *avctx)
  76. {
  77.     av_freep(&avctx->coded_frame);
  78.  
  79.     return 0;
  80. }
  81.  
  82. AVCodec ff_yuv4_encoder = {
  83.     .name         = "yuv4",
  84.     .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),
  85.     .type         = AVMEDIA_TYPE_VIDEO,
  86.     .id           = AV_CODEC_ID_YUV4,
  87.     .init         = yuv4_encode_init,
  88.     .encode2      = yuv4_encode_frame,
  89.     .close        = yuv4_encode_close,
  90.     .pix_fmts     = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
  91. };
  92.