blob: 1b177d426215d098de7b2c8f67285ce6cd2740eb
1 | /* |
2 | * y41p decoder |
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_decode_init(AVCodecContext *avctx) |
27 | { |
28 | avctx->pix_fmt = AV_PIX_FMT_YUV411P; |
29 | avctx->bits_per_raw_sample = 12; |
30 | |
31 | if (avctx->width & 7) { |
32 | av_log(avctx, AV_LOG_WARNING, "y41p requires width to be divisible by 8.\n"); |
33 | } |
34 | |
35 | return 0; |
36 | } |
37 | |
38 | static int y41p_decode_frame(AVCodecContext *avctx, void *data, |
39 | int *got_frame, AVPacket *avpkt) |
40 | { |
41 | AVFrame *pic = data; |
42 | uint8_t *src = avpkt->data; |
43 | uint8_t *y, *u, *v; |
44 | int i, j, ret; |
45 | |
46 | if (avpkt->size < 3LL * avctx->height * avctx->width / 2) { |
47 | av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n"); |
48 | return AVERROR(EINVAL); |
49 | } |
50 | |
51 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
52 | return ret; |
53 | |
54 | pic->key_frame = 1; |
55 | pic->pict_type = AV_PICTURE_TYPE_I; |
56 | |
57 | for (i = avctx->height - 1; i >= 0 ; i--) { |
58 | y = &pic->data[0][i * pic->linesize[0]]; |
59 | u = &pic->data[1][i * pic->linesize[1]]; |
60 | v = &pic->data[2][i * pic->linesize[2]]; |
61 | for (j = 0; j < avctx->width; j += 8) { |
62 | *(u++) = *src++; |
63 | *(y++) = *src++; |
64 | *(v++) = *src++; |
65 | *(y++) = *src++; |
66 | |
67 | *(u++) = *src++; |
68 | *(y++) = *src++; |
69 | *(v++) = *src++; |
70 | *(y++) = *src++; |
71 | |
72 | *(y++) = *src++; |
73 | *(y++) = *src++; |
74 | *(y++) = *src++; |
75 | *(y++) = *src++; |
76 | } |
77 | } |
78 | |
79 | *got_frame = 1; |
80 | |
81 | return avpkt->size; |
82 | } |
83 | |
84 | AVCodec ff_y41p_decoder = { |
85 | .name = "y41p", |
86 | .long_name = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"), |
87 | .type = AVMEDIA_TYPE_VIDEO, |
88 | .id = AV_CODEC_ID_Y41P, |
89 | .init = y41p_decode_init, |
90 | .decode = y41p_decode_frame, |
91 | .capabilities = AV_CODEC_CAP_DR1, |
92 | }; |
93 |