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
26static 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
38static 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
84AVCodec 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};
93