Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * libquicktime yuv4 decoder
  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_decode_init(AVCodecContext *avctx)
  27. {
  28.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  29.  
  30.     return 0;
  31. }
  32.  
  33. static int yuv4_decode_frame(AVCodecContext *avctx, void *data,
  34.                              int *got_frame, AVPacket *avpkt)
  35. {
  36.     AVFrame *pic = data;
  37.     const uint8_t *src = avpkt->data;
  38.     uint8_t *y, *u, *v;
  39.     int i, j, ret;
  40.  
  41.     if (avpkt->size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) {
  42.         av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
  43.         return AVERROR(EINVAL);
  44.     }
  45.  
  46.     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
  47.         return ret;
  48.  
  49.     pic->key_frame = 1;
  50.     pic->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.             u[j] = *src++ ^ 0x80;
  59.             v[j] = *src++ ^ 0x80;
  60.             y[                   2 * j    ] = *src++;
  61.             y[                   2 * j + 1] = *src++;
  62.             y[pic->linesize[0] + 2 * j    ] = *src++;
  63.             y[pic->linesize[0] + 2 * j + 1] = *src++;
  64.         }
  65.  
  66.         y += 2 * pic->linesize[0];
  67.         u +=     pic->linesize[1];
  68.         v +=     pic->linesize[2];
  69.     }
  70.  
  71.     *got_frame = 1;
  72.  
  73.     return avpkt->size;
  74. }
  75.  
  76. AVCodec ff_yuv4_decoder = {
  77.     .name         = "yuv4",
  78.     .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),
  79.     .type         = AVMEDIA_TYPE_VIDEO,
  80.     .id           = AV_CODEC_ID_YUV4,
  81.     .init         = yuv4_decode_init,
  82.     .decode       = yuv4_decode_frame,
  83.     .capabilities = CODEC_CAP_DR1,
  84. };
  85.