Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavcodec / avuidec.c
1 /*
2 * AVID Meridien decoder
3 *
4 * Copyright (c) 2012 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 #include "libavutil/intreadwrite.h"
26
27 static av_cold int avui_decode_init(AVCodecContext *avctx)
28 {
29 avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
30 return 0;
31 }
32
33 static int avui_decode_frame(AVCodecContext *avctx, void *data,
34 int *got_frame, AVPacket *avpkt)
35 {
36 int ret;
37 AVFrame *pic = data;
38 const uint8_t *src = avpkt->data, *extradata = avctx->extradata;
39 const uint8_t *srca;
40 uint8_t *y, *u, *v, *a;
41 int transparent, interlaced = 1, skip, opaque_length, i, j, k;
42 uint32_t extradata_size = avctx->extradata_size;
43
44 while (extradata_size >= 24) {
45 uint32_t atom_size = AV_RB32(extradata);
46 if (!memcmp(&extradata[4], "APRGAPRG0001", 12)) {
47 interlaced = extradata[19] != 1;
48 break;
49 }
50 if (atom_size && atom_size <= extradata_size) {
51 extradata += atom_size;
52 extradata_size -= atom_size;
53 } else {
54 break;
55 }
56 }
57 if (avctx->height == 486) {
58 skip = 10;
59 } else {
60 skip = 16;
61 }
62 opaque_length = 2 * avctx->width * (avctx->height + skip) + 4 * interlaced;
63 if (avpkt->size < opaque_length) {
64 av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
65 return AVERROR(EINVAL);
66 }
67 transparent = avctx->bits_per_coded_sample == 32 &&
68 avpkt->size >= opaque_length * 2 + 4;
69 srca = src + opaque_length + 5;
70
71 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
72 return ret;
73
74 pic->key_frame = 1;
75 pic->pict_type = AV_PICTURE_TYPE_I;
76
77 if (!interlaced) {
78 src += avctx->width * skip;
79 srca += avctx->width * skip;
80 }
81
82 for (i = 0; i < interlaced + 1; i++) {
83 src += avctx->width * skip;
84 srca += avctx->width * skip;
85 if (interlaced && avctx->height == 486) {
86 y = pic->data[0] + (1 - i) * pic->linesize[0];
87 u = pic->data[1] + (1 - i) * pic->linesize[1];
88 v = pic->data[2] + (1 - i) * pic->linesize[2];
89 a = pic->data[3] + (1 - i) * pic->linesize[3];
90 } else {
91 y = pic->data[0] + i * pic->linesize[0];
92 u = pic->data[1] + i * pic->linesize[1];
93 v = pic->data[2] + i * pic->linesize[2];
94 a = pic->data[3] + i * pic->linesize[3];
95 }
96
97 for (j = 0; j < avctx->height >> interlaced; j++) {
98 for (k = 0; k < avctx->width >> 1; k++) {
99 u[ k ] = *src++;
100 y[2 * k ] = *src++;
101 a[2 * k ] = 0xFF - (transparent ? *srca++ : 0);
102 srca++;
103 v[ k ] = *src++;
104 y[2 * k + 1] = *src++;
105 a[2 * k + 1] = 0xFF - (transparent ? *srca++ : 0);
106 srca++;
107 }
108
109 y += (interlaced + 1) * pic->linesize[0];
110 u += (interlaced + 1) * pic->linesize[1];
111 v += (interlaced + 1) * pic->linesize[2];
112 a += (interlaced + 1) * pic->linesize[3];
113 }
114 src += 4;
115 srca += 4;
116 }
117 *got_frame = 1;
118
119 return avpkt->size;
120 }
121
122 AVCodec ff_avui_decoder = {
123 .name = "avui",
124 .long_name = NULL_IF_CONFIG_SMALL("Avid Meridien Uncompressed"),
125 .type = AVMEDIA_TYPE_VIDEO,
126 .id = AV_CODEC_ID_AVUI,
127 .init = avui_decode_init,
128 .decode = avui_decode_frame,
129 .capabilities = CODEC_CAP_DR1,
130 };