1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*
* SMV JPEG decoder
* Copyright (c) 2013 Ash Hughes
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* SMV JPEG decoder.
*/
// #define DEBUG
#include "avcodec.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "mjpegdec.h"
#include "internal.h"
typedef struct SMVJpegDecodeContext {
MJpegDecodeContext jpg;
AVFrame *picture[2]; /* pictures array */
AVCodecContext* avctx;
int frames_per_jpeg;
int mjpeg_data_size;
} SMVJpegDecodeContext;
static inline void smv_img_pnt_plane(uint8_t **dst, uint8_t *src,
int src_linesize, int height, int nlines)
{
if (!dst || !src)
return;
src += (nlines) * src_linesize * height;
*dst = src;
}
static inline void smv_img_pnt(uint8_t *dst_data[4], uint8_t *src_data[4],
const int src_linesizes[4],
enum AVPixelFormat pix_fmt, int width, int height,
int nlines)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
int i, planes_nb = 0;
if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
return;
for (i = 0; i < desc->nb_components; i++)
planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
for (i = 0; i < planes_nb; i++) {
int h = height;
if (i == 1 || i == 2) {
h = AV_CEIL_RSHIFT(height, desc->log2_chroma_h);
}
smv_img_pnt_plane(&dst_data[i], src_data[i],
src_linesizes[i], h, nlines);
}
if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
desc->flags & FF_PSEUDOPAL)
dst_data[1] = src_data[1];
}
static av_cold int smvjpeg_decode_end(AVCodecContext *avctx)
{
SMVJpegDecodeContext *s = avctx->priv_data;
MJpegDecodeContext *jpg = &s->jpg;
int ret;
jpg->picture_ptr = NULL;
av_frame_free(&s->picture[0]);
av_frame_free(&s->picture[1]);
avcodec_free_context(&s->avctx);
return ret;
}
static av_cold int smvjpeg_decode_init(AVCodecContext *avctx)
{
SMVJpegDecodeContext *s = avctx->priv_data;
AVCodec *codec;
AVDictionary *thread_opt = NULL;
int ret = 0, r;
s->frames_per_jpeg = 0;
s->picture[0] = av_frame_alloc();
if (!s->picture[0])
return AVERROR(ENOMEM);
s->picture[1] = av_frame_alloc();
if (!s->picture[1]) {
av_frame_free(&s->picture[0]);
return AVERROR(ENOMEM);
}
s->jpg.picture_ptr = s->picture[0];
if (avctx->extradata_size >= 4)
s->frames_per_jpeg = AV_RL32(avctx->extradata);
if (s->frames_per_jpeg <= 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid number of frames per jpeg.\n");
ret = AVERROR_INVALIDDATA;
}
codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
if (!codec) {
av_log(avctx, AV_LOG_ERROR, "MJPEG codec not found\n");
smvjpeg_decode_end(avctx);
return AVERROR_DECODER_NOT_FOUND;
}
s->avctx = avcodec_alloc_context3(codec);
av_dict_set(&thread_opt, "threads", "1", 0);
s->avctx->refcounted_frames = 1;
s->avctx->flags = avctx->flags;
s->avctx->idct_algo = avctx->idct_algo;
if ((r = ff_codec_open2_recursive(s->avctx, codec, &thread_opt)) < 0) {
av_log(avctx, AV_LOG_ERROR, "MJPEG codec failed to open\n");
ret = r;
}
av_dict_free(&thread_opt);
if (ret < 0)
smvjpeg_decode_end(avctx);
return ret;
}
static int smvjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
AVPacket *avpkt)
{
const AVPixFmtDescriptor *desc;
SMVJpegDecodeContext *s = avctx->priv_data;
AVFrame* mjpeg_data = s->picture[0];
int i, cur_frame = 0, ret = 0;
cur_frame = avpkt->pts % s->frames_per_jpeg;
/* cur_frame is later used to calculate the buffer offset, so it mustn't be negative */
if (cur_frame < 0)
cur_frame += s->frames_per_jpeg;
/* Are we at the start of a block? */
if (!cur_frame) {
av_frame_unref(mjpeg_data);
ret = avcodec_decode_video2(s->avctx, mjpeg_data, &s->mjpeg_data_size, avpkt);
if (ret < 0) {
s->mjpeg_data_size = 0;
return ret;
}
} else if (!s->mjpeg_data_size)
return AVERROR(EINVAL);
desc = av_pix_fmt_desc_get(s->avctx->pix_fmt);
av_assert0(desc);
if (mjpeg_data->height % (s->frames_per_jpeg << desc->log2_chroma_h)) {
av_log(avctx, AV_LOG_ERROR, "Invalid height\n");
return AVERROR_INVALIDDATA;
}
/*use the last lot... */
*data_size = s->mjpeg_data_size;
avctx->pix_fmt = s->avctx->pix_fmt;
/* We shouldn't get here if frames_per_jpeg <= 0 because this was rejected
in init */
ret = ff_set_dimensions(avctx, mjpeg_data->width, mjpeg_data->height / s->frames_per_jpeg);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Failed to set dimensions\n");
return ret;
}
if (*data_size) {
s->picture[1]->extended_data = NULL;
s->picture[1]->width = avctx->width;
s->picture[1]->height = avctx->height;
s->picture[1]->format = avctx->pix_fmt;
smv_img_pnt(s->picture[1]->data, mjpeg_data->data, mjpeg_data->linesize,
avctx->pix_fmt, avctx->width, avctx->height, cur_frame);
for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
s->picture[1]->linesize[i] = mjpeg_data->linesize[i];
ret = av_frame_ref(data, s->picture[1]);
if (ret < 0)
return ret;
}
return avpkt->size;
}
static const AVClass smvjpegdec_class = {
.class_name = "SMVJPEG decoder",
.item_name = av_default_item_name,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_smvjpeg_decoder = {
.name = "smvjpeg",
.long_name = NULL_IF_CONFIG_SMALL("SMV JPEG"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_SMVJPEG,
.priv_data_size = sizeof(SMVJpegDecodeContext),
.init = smvjpeg_decode_init,
.close = smvjpeg_decode_end,
.decode = smvjpeg_decode_frame,
.priv_class = &smvjpegdec_class,
};
|
