ffmpeg/libavcodec/yuv4enc.c

   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 = av_frame_alloc();
  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 };