1/*
2 * y41p encoder
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_encode_init(AVCodecContext *avctx)
27{
28    if (avctx->width & 7) {
29        av_log(avctx, AV_LOG_ERROR, "y41p requires width to be divisible by 8.\n");
30        return AVERROR_INVALIDDATA;
31    }
32
33    avctx->coded_frame = av_frame_alloc();
34    avctx->bits_per_coded_sample = 12;
35
36    if (!avctx->coded_frame) {
37        av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
38        return AVERROR(ENOMEM);
39    }
40
41    return 0;
42}
43
44static int y41p_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
45                             const AVFrame *pic, int *got_packet)
46{
47    uint8_t *dst;
48    uint8_t *y, *u, *v;
49    int i, j, ret;
50
51    if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width * avctx->height * 1.5)) < 0)
52        return ret;
53
54    avctx->coded_frame->key_frame = 1;
55    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
56    dst = pkt->data;
57
58    for (i = avctx->height - 1; i >= 0; i--) {
59        y = &pic->data[0][i * pic->linesize[0]];
60        u = &pic->data[1][i * pic->linesize[1]];
61        v = &pic->data[2][i * pic->linesize[2]];
62        for (j = 0; j < avctx->width; j += 8) {
63            *(dst++) = *(u++);
64            *(dst++) = *(y++);
65            *(dst++) = *(v++);
66            *(dst++) = *(y++);
67
68            *(dst++) = *(u++);
69            *(dst++) = *(y++);
70            *(dst++) = *(v++);
71            *(dst++) = *(y++);
72
73            *(dst++) = *(y++);
74            *(dst++) = *(y++);
75            *(dst++) = *(y++);
76            *(dst++) = *(y++);
77        }
78    }
79
80    pkt->flags |= AV_PKT_FLAG_KEY;
81    *got_packet = 1;
82    return 0;
83}
84
85static av_cold int y41p_encode_close(AVCodecContext *avctx)
86{
87    av_freep(&avctx->coded_frame);
88
89    return 0;
90}
91
92AVCodec ff_y41p_encoder = {
93    .name         = "y41p",
94    .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"),
95    .type         = AVMEDIA_TYPE_VIDEO,
96    .id           = AV_CODEC_ID_Y41P,
97    .init         = y41p_encode_init,
98    .encode2      = y41p_encode_frame,
99    .close        = y41p_encode_close,
100    .pix_fmts     = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
101                                                 AV_PIX_FMT_NONE },
102};
103