Commit | Line | Data |
---|---|---|
2ba45a60 DM |
1 | /* |
2 | * AVRn decoder | |
3 | * Copyright (c) 2012 Michael Niedermayer | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include "avcodec.h" | |
23 | #include "internal.h" | |
24 | #include "mjpeg.h" | |
25 | #include "mjpegdec.h" | |
26 | #include "libavutil/imgutils.h" | |
27 | ||
28 | typedef struct { | |
29 | MJpegDecodeContext mjpeg_ctx; | |
30 | int is_mjpeg; | |
31 | int interlace; //FIXME use frame.interlaced_frame | |
32 | int tff; | |
33 | } AVRnContext; | |
34 | ||
35 | static av_cold int init(AVCodecContext *avctx) | |
36 | { | |
37 | AVRnContext *a = avctx->priv_data; | |
38 | int ret; | |
39 | ||
40 | // Support "Resolution 1:1" for Avid AVI Codec | |
41 | a->is_mjpeg = avctx->extradata_size < 31 || memcmp(&avctx->extradata[28], "1:1", 3); | |
42 | ||
43 | if(!a->is_mjpeg && avctx->lowres) { | |
44 | av_log(avctx, AV_LOG_ERROR, "lowres is not possible with rawvideo\n"); | |
45 | return AVERROR(EINVAL); | |
46 | } | |
47 | ||
48 | if(a->is_mjpeg) | |
49 | return ff_mjpeg_decode_init(avctx); | |
50 | ||
51 | if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0) | |
52 | return ret; | |
53 | ||
54 | avctx->pix_fmt = AV_PIX_FMT_UYVY422; | |
55 | ||
56 | if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) { | |
57 | int ndx = avctx->extradata[4] + 4; | |
58 | a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4); | |
59 | if(a->interlace) { | |
60 | a->tff = avctx->extradata[ndx + 24] == 1; | |
61 | } | |
62 | } | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static av_cold int end(AVCodecContext *avctx) | |
68 | { | |
69 | AVRnContext *a = avctx->priv_data; | |
70 | ||
71 | if(a->is_mjpeg) | |
72 | ff_mjpeg_decode_end(avctx); | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | static int decode_frame(AVCodecContext *avctx, void *data, | |
78 | int *got_frame, AVPacket *avpkt) | |
79 | { | |
80 | AVRnContext *a = avctx->priv_data; | |
81 | AVFrame *p = data; | |
82 | const uint8_t *buf = avpkt->data; | |
83 | int buf_size = avpkt->size; | |
84 | int y, ret, true_height; | |
85 | ||
86 | if(a->is_mjpeg) | |
87 | return ff_mjpeg_decode_frame(avctx, data, got_frame, avpkt); | |
88 | ||
89 | true_height = buf_size / (2*avctx->width); | |
90 | ||
91 | if(buf_size < 2*avctx->width * avctx->height) { | |
92 | av_log(avctx, AV_LOG_ERROR, "packet too small\n"); | |
93 | return AVERROR_INVALIDDATA; | |
94 | } | |
95 | ||
96 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) | |
97 | return ret; | |
98 | p->pict_type= AV_PICTURE_TYPE_I; | |
99 | p->key_frame= 1; | |
100 | ||
101 | if(a->interlace) { | |
102 | buf += (true_height - avctx->height)*avctx->width; | |
103 | for(y = 0; y < avctx->height-1; y+=2) { | |
104 | memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width); | |
105 | memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width); | |
106 | buf += 2*avctx->width; | |
107 | } | |
108 | } else { | |
109 | buf += (true_height - avctx->height)*avctx->width*2; | |
110 | for(y = 0; y < avctx->height; y++) { | |
111 | memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width); | |
112 | buf += 2*avctx->width; | |
113 | } | |
114 | } | |
115 | ||
116 | *got_frame = 1; | |
117 | return buf_size; | |
118 | } | |
119 | ||
120 | AVCodec ff_avrn_decoder = { | |
121 | .name = "avrn", | |
122 | .long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"), | |
123 | .type = AVMEDIA_TYPE_VIDEO, | |
124 | .id = AV_CODEC_ID_AVRN, | |
125 | .priv_data_size = sizeof(AVRnContext), | |
126 | .init = init, | |
127 | .close = end, | |
128 | .decode = decode_frame, | |
129 | .capabilities = CODEC_CAP_DR1, | |
130 | .max_lowres = 3, | |
131 | }; |