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yuv4enc.c
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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 
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 
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;
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 
76 {
77  av_freep(&avctx->coded_frame);
78 
79  return 0;
80 }
81 
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 };