blob: f89f62debe8d189b8869dcb88657c02b32b1aed6
1 | /* |
2 | * libquicktime yuv4 decoder |
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_decode_init(AVCodecContext *avctx) |
27 | { |
28 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
29 | |
30 | return 0; |
31 | } |
32 | |
33 | static int yuv4_decode_frame(AVCodecContext *avctx, void *data, |
34 | int *got_frame, AVPacket *avpkt) |
35 | { |
36 | AVFrame *pic = data; |
37 | const uint8_t *src = avpkt->data; |
38 | uint8_t *y, *u, *v; |
39 | int i, j, ret; |
40 | |
41 | if (avpkt->size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) { |
42 | av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n"); |
43 | return AVERROR(EINVAL); |
44 | } |
45 | |
46 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
47 | return ret; |
48 | |
49 | pic->key_frame = 1; |
50 | pic->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 | u[j] = *src++ ^ 0x80; |
59 | v[j] = *src++ ^ 0x80; |
60 | y[ 2 * j ] = *src++; |
61 | y[ 2 * j + 1] = *src++; |
62 | y[pic->linesize[0] + 2 * j ] = *src++; |
63 | y[pic->linesize[0] + 2 * j + 1] = *src++; |
64 | } |
65 | |
66 | y += 2 * pic->linesize[0]; |
67 | u += pic->linesize[1]; |
68 | v += pic->linesize[2]; |
69 | } |
70 | |
71 | *got_frame = 1; |
72 | |
73 | return avpkt->size; |
74 | } |
75 | |
76 | AVCodec ff_yuv4_decoder = { |
77 | .name = "yuv4", |
78 | .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"), |
79 | .type = AVMEDIA_TYPE_VIDEO, |
80 | .id = AV_CODEC_ID_YUV4, |
81 | .init = yuv4_decode_init, |
82 | .decode = yuv4_decode_frame, |
83 | .capabilities = AV_CODEC_CAP_DR1, |
84 | }; |
85 |