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 AVCodecContext *mjpeg_avctx;
30 int is_mjpeg;
31 int interlace;
32 int tff;
33 } AVRnContext;
34
init(AVCodecContext * avctx)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 AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
50 AVDictionary *thread_opt = NULL;
51 if (!codec) {
52 av_log(avctx, AV_LOG_ERROR, "MJPEG codec not found\n");
53 return AVERROR_DECODER_NOT_FOUND;
54 }
55
56 a->mjpeg_avctx = avcodec_alloc_context3(codec);
57
58 av_dict_set(&thread_opt, "threads", "1", 0); // Is this needed ?
59 a->mjpeg_avctx->refcounted_frames = 1;
60 a->mjpeg_avctx->flags = avctx->flags;
61 a->mjpeg_avctx->idct_algo = avctx->idct_algo;
62 a->mjpeg_avctx->lowres = avctx->lowres;
63 a->mjpeg_avctx->width = avctx->width;
64 a->mjpeg_avctx->height = avctx->height;
65
66 if ((ret = ff_codec_open2_recursive(a->mjpeg_avctx, codec, &thread_opt)) < 0) {
67 av_log(avctx, AV_LOG_ERROR, "MJPEG codec failed to open\n");
68 }
69 av_dict_free(&thread_opt);
70
71 return ret;
72 }
73
74 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
75 return ret;
76
77 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
78
79 if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) {
80 int ndx = avctx->extradata[4] + 4;
81 a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4);
82 if(a->interlace) {
83 a->tff = avctx->extradata[ndx + 24] == 1;
84 }
85 }
86
87 return 0;
88 }
89
end(AVCodecContext * avctx)90 static av_cold int end(AVCodecContext *avctx)
91 {
92 AVRnContext *a = avctx->priv_data;
93
94 avcodec_close(a->mjpeg_avctx);
95 av_freep(&a->mjpeg_avctx);
96
97 return 0;
98 }
99
decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)100 static int decode_frame(AVCodecContext *avctx, void *data,
101 int *got_frame, AVPacket *avpkt)
102 {
103 AVRnContext *a = avctx->priv_data;
104 AVFrame *p = data;
105 const uint8_t *buf = avpkt->data;
106 int buf_size = avpkt->size;
107 int y, ret, true_height;
108
109 if(a->is_mjpeg) {
110 ret = avcodec_decode_video2(a->mjpeg_avctx, data, got_frame, avpkt);
111
112 if (ret >= 0 && *got_frame && avctx->width <= p->width && avctx->height <= p->height) {
113 int shift = p->height - avctx->height;
114 int subsample_h, subsample_v;
115
116 av_pix_fmt_get_chroma_sub_sample(p->format, &subsample_h, &subsample_v);
117
118 p->data[0] += p->linesize[0] * shift;
119 if (p->data[2]) {
120 p->data[1] += p->linesize[1] * (shift>>subsample_v);
121 p->data[2] += p->linesize[2] * (shift>>subsample_v);
122 }
123
124 p->width = avctx->width;
125 p->height = avctx->height;
126 }
127 avctx->pix_fmt = a->mjpeg_avctx->pix_fmt;
128 return ret;
129 }
130
131 true_height = buf_size / (2*avctx->width);
132
133 if(buf_size < 2*avctx->width * avctx->height) {
134 av_log(avctx, AV_LOG_ERROR, "packet too small\n");
135 return AVERROR_INVALIDDATA;
136 }
137
138 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
139 return ret;
140 p->pict_type= AV_PICTURE_TYPE_I;
141 p->key_frame= 1;
142
143 if(a->interlace) {
144 buf += (true_height - avctx->height)*avctx->width;
145 for(y = 0; y < avctx->height-1; y+=2) {
146 memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width);
147 memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width);
148 buf += 2*avctx->width;
149 }
150 } else {
151 buf += (true_height - avctx->height)*avctx->width*2;
152 for(y = 0; y < avctx->height; y++) {
153 memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width);
154 buf += 2*avctx->width;
155 }
156 }
157
158 *got_frame = 1;
159 return buf_size;
160 }
161
162 AVCodec ff_avrn_decoder = {
163 .name = "avrn",
164 .long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"),
165 .type = AVMEDIA_TYPE_VIDEO,
166 .id = AV_CODEC_ID_AVRN,
167 .priv_data_size = sizeof(AVRnContext),
168 .init = init,
169 .close = end,
170 .decode = decode_frame,
171 .max_lowres = 3,
172 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
173 };
174