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 "codec_internal.h"
  25 #include "encode.h"
  26 #include "internal.h"
  27
  28 static av_cold int y41p_encode_init(AVCodecContext *avctx)
  29 {
  30     if (avctx->width & 7) {
  31         av_log(avctx, AV_LOG_ERROR, "y41p requires width to be divisible by 8.\n");
  32         return AVERROR_INVALIDDATA;
  33     }
  34
  35     avctx->bits_per_coded_sample = 12;
  36     avctx->bit_rate = ff_guess_coded_bitrate(avctx);
  37
  38     return 0;
  39 }
  40
  41 static int y41p_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  42                              const AVFrame *pic, int *got_packet)
  43 {
  44     uint8_t *dst;
  45     const uint8_t *y, *u, *v;
  46     int i, j, ret;
  47
  48     ret = ff_get_encode_buffer(avctx, pkt, avctx->width * avctx->height * 1.5, 0);
  49     if (ret < 0)
  50         return ret;
  51
  52     dst = pkt->data;
  53
  54     for (i = avctx->height - 1; i >= 0; i--) {
  55         y = &pic->data[0][i * pic->linesize[0]];
  56         u = &pic->data[1][i * pic->linesize[1]];
  57         v = &pic->data[2][i * pic->linesize[2]];
  58         for (j = 0; j < avctx->width; j += 8) {
  59             *(dst++) = *(u++);
  60             *(dst++) = *(y++);
  61             *(dst++) = *(v++);
  62             *(dst++) = *(y++);
  63
  64             *(dst++) = *(u++);
  65             *(dst++) = *(y++);
  66             *(dst++) = *(v++);
  67             *(dst++) = *(y++);
  68
  69             *(dst++) = *(y++);
  70             *(dst++) = *(y++);
  71             *(dst++) = *(y++);
  72             *(dst++) = *(y++);
  73         }
  74     }
  75
  76     *got_packet = 1;
  77     return 0;
  78 }
  79
  80 const FFCodec ff_y41p_encoder = {
  81     .p.name       = "y41p",
  82     CODEC_LONG_NAME("Uncompressed YUV 4:1:1 12-bit"),
  83     .p.type       = AVMEDIA_TYPE_VIDEO,
  84     .p.id         = AV_CODEC_ID_Y41P,
  85     .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
  86     .init         = y41p_encode_init,
  87     FF_CODEC_ENCODE_CB(y41p_encode_frame),
  88     .p.pix_fmts   = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
  89                                                  AV_PIX_FMT_NONE },
  90 };