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  1. /*
  2.  * y41p encoder
  3.  *
  4.  * Copyright (c) 2012 Paul B Mahol
  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 y41p_encode_init(AVCodecContext *avctx)
  27. {
  28.     if (avctx->width & 7) {
  29.         av_log(avctx, AV_LOG_ERROR, "y41p requires width to be divisible by 8.\n");
  30.         return AVERROR_INVALIDDATA;
  31.     }
  32.  
  33.     avctx->coded_frame = avcodec_alloc_frame();
  34.     avctx->bits_per_coded_sample = 12;
  35.  
  36.     if (!avctx->coded_frame) {
  37.         av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
  38.         return AVERROR(ENOMEM);
  39.     }
  40.  
  41.     return 0;
  42. }
  43.  
  44. static int y41p_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  45.                              const AVFrame *pic, int *got_packet)
  46. {
  47.     uint8_t *dst;
  48.     uint8_t *y, *u, *v;
  49.     int i, j, ret;
  50.  
  51.     if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width * avctx->height * 1.5)) < 0)
  52.         return ret;
  53.  
  54.     avctx->coded_frame->key_frame = 1;
  55.     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
  56.     dst = pkt->data;
  57.  
  58.     for (i = avctx->height - 1; i >= 0; i--) {
  59.         y = &pic->data[0][i * pic->linesize[0]];
  60.         u = &pic->data[1][i * pic->linesize[1]];
  61.         v = &pic->data[2][i * pic->linesize[2]];
  62.         for (j = 0; j < avctx->width; j += 8) {
  63.             *(dst++) = *(u++);
  64.             *(dst++) = *(y++);
  65.             *(dst++) = *(v++);
  66.             *(dst++) = *(y++);
  67.  
  68.             *(dst++) = *(u++);
  69.             *(dst++) = *(y++);
  70.             *(dst++) = *(v++);
  71.             *(dst++) = *(y++);
  72.  
  73.             *(dst++) = *(y++);
  74.             *(dst++) = *(y++);
  75.             *(dst++) = *(y++);
  76.             *(dst++) = *(y++);
  77.         }
  78.     }
  79.  
  80.     pkt->flags |= AV_PKT_FLAG_KEY;
  81.     *got_packet = 1;
  82.     return 0;
  83. }
  84.  
  85. static av_cold int y41p_encode_close(AVCodecContext *avctx)
  86. {
  87.     av_freep(&avctx->coded_frame);
  88.  
  89.     return 0;
  90. }
  91.  
  92. AVCodec ff_y41p_encoder = {
  93.     .name         = "y41p",
  94.     .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"),
  95.     .type         = AVMEDIA_TYPE_VIDEO,
  96.     .id           = AV_CODEC_ID_Y41P,
  97.     .init         = y41p_encode_init,
  98.     .encode2      = y41p_encode_frame,
  99.     .close        = y41p_encode_close,
  100.     .pix_fmts     = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
  101.                                                  AV_PIX_FMT_NONE },
  102. };
  103.