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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 < 1.5 * avctx->height * avctx->width) { | |
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 = CODEC_CAP_DR1, | |
92 | }; |