Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavcodec / y41pdec.c
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 };