ffmpeg/libavcodec/y41penc.c

   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 = av_frame_alloc();
  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 };