dxtory: Replace AV_WN16A(AV_RN16A()) combination by AV_COPY16
[libav.git] / libavcodec / dxtory.c
1 /*
2 * Dxtory decoder
3 *
4 * Copyright (c) 2011 Konstantin Shishkov
5 *
6 * This file is part of Libav.
7 *
8 * Libav 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 * Libav 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 Libav; 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 "libavutil/common.h"
25 #include "libavutil/intreadwrite.h"
26
27 static av_cold int decode_init(AVCodecContext *avctx)
28 {
29 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
30 avctx->coded_frame = avcodec_alloc_frame();
31 if (!avctx->coded_frame)
32 return AVERROR(ENOMEM);
33
34 return 0;
35 }
36
37 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
38 AVPacket *avpkt)
39 {
40 int h, w;
41 AVFrame *pic = avctx->coded_frame;
42 const uint8_t *src = avpkt->data;
43 uint8_t *Y1, *Y2, *U, *V;
44 int ret;
45
46 if (pic->data[0])
47 avctx->release_buffer(avctx, pic);
48
49 if (avpkt->size < avctx->width * avctx->height * 3 / 2 + 16) {
50 av_log(avctx, AV_LOG_ERROR, "packet too small\n");
51 return AVERROR_INVALIDDATA;
52 }
53
54 pic->reference = 0;
55 if ((ret = avctx->get_buffer(avctx, pic)) < 0)
56 return ret;
57
58 pic->pict_type = AV_PICTURE_TYPE_I;
59 pic->key_frame = 1;
60
61 if (AV_RL32(src) != 0x01000002) {
62 av_log_ask_for_sample(avctx, "Unknown frame header %X\n", AV_RL32(src));
63 return AVERROR_PATCHWELCOME;
64 }
65 src += 16;
66
67 Y1 = pic->data[0];
68 Y2 = pic->data[0] + pic->linesize[0];
69 U = pic->data[1];
70 V = pic->data[2];
71 for (h = 0; h < avctx->height; h += 2) {
72 for (w = 0; w < avctx->width; w += 2) {
73 AV_COPY16(Y1 + w, src);
74 AV_COPY16(Y2 + w, src + 2);
75 U[w >> 1] = src[4] + 0x80;
76 V[w >> 1] = src[5] + 0x80;
77 src += 6;
78 }
79 Y1 += pic->linesize[0] << 1;
80 Y2 += pic->linesize[0] << 1;
81 U += pic->linesize[1];
82 V += pic->linesize[2];
83 }
84
85 *data_size = sizeof(AVFrame);
86 *(AVFrame*)data = *pic;
87
88 return avpkt->size;
89 }
90
91 static av_cold int decode_close(AVCodecContext *avctx)
92 {
93 AVFrame *pic = avctx->coded_frame;
94 if (pic->data[0])
95 avctx->release_buffer(avctx, pic);
96 av_freep(&avctx->coded_frame);
97
98 return 0;
99 }
100
101 AVCodec ff_dxtory_decoder = {
102 .name = "dxtory",
103 .long_name = NULL_IF_CONFIG_SMALL("Dxtory"),
104 .type = AVMEDIA_TYPE_VIDEO,
105 .id = AV_CODEC_ID_DXTORY,
106 .init = decode_init,
107 .close = decode_close,
108 .decode = decode_frame,
109 .capabilities = CODEC_CAP_DR1,
110 };