1/*
2 * libquicktime yuv4 encoder
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
26static av_cold int yuv4_encode_init(AVCodecContext *avctx)
27{
28    avctx->coded_frame = av_frame_alloc();
29
30    if (!avctx->coded_frame) {
31        av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
32        return AVERROR(ENOMEM);
33    }
34
35    return 0;
36}
37
38static int yuv4_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
39                             const AVFrame *pic, int *got_packet)
40{
41    uint8_t *dst;
42    uint8_t *y, *u, *v;
43    int i, j, ret;
44
45    if ((ret = ff_alloc_packet2(avctx, pkt, 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1))) < 0)
46        return ret;
47    dst = pkt->data;
48
49    avctx->coded_frame->key_frame = 1;
50    avctx->coded_frame->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            *dst++ = u[j] ^ 0x80;
59            *dst++ = v[j] ^ 0x80;
60            *dst++ = y[                   2 * j    ];
61            *dst++ = y[                   2 * j + 1];
62            *dst++ = y[pic->linesize[0] + 2 * j    ];
63            *dst++ = y[pic->linesize[0] + 2 * j + 1];
64        }
65        y += 2 * pic->linesize[0];
66        u +=     pic->linesize[1];
67        v +=     pic->linesize[2];
68    }
69
70    pkt->flags |= AV_PKT_FLAG_KEY;
71    *got_packet = 1;
72    return 0;
73}
74
75static av_cold int yuv4_encode_close(AVCodecContext *avctx)
76{
77    av_freep(&avctx->coded_frame);
78
79    return 0;
80}
81
82AVCodec ff_yuv4_encoder = {
83    .name         = "yuv4",
84    .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),
85    .type         = AVMEDIA_TYPE_VIDEO,
86    .id           = AV_CODEC_ID_YUV4,
87    .init         = yuv4_encode_init,
88    .encode2      = yuv4_encode_frame,
89    .close        = yuv4_encode_close,
90    .pix_fmts     = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
91};
92