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y41penc.c
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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 
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 
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 
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;
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 
86 {
87  av_freep(&avctx->coded_frame);
88 
89  return 0;
90 }
91 
93  .name = "y41p",
94  .type = AVMEDIA_TYPE_VIDEO,
95  .id = AV_CODEC_ID_Y41P,
96  .init = y41p_encode_init,
97  .encode2 = y41p_encode_frame,
98  .close = y41p_encode_close,
99  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
100  AV_PIX_FMT_NONE },
101  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"),
102 };