Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavcodec / avrndec.c
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 };