path: root/libavcodec/avrndec.c (plain)
blob: c37f99661b5dc55a834c2aecf73604ffe87678e1

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
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
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
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	.capabilities = AV_CODEC_CAP_DR1,
172	.max_lowres = 3,
173	.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
174	};
175