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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 | }; |