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
|
/*
* Sunplus JPEG decoder (SP5X)
* Copyright (c) 2003 Alex Beregszaszi
*
* 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 libavcodec/sp5xdec.c
* Sunplus JPEG decoder (SP5X).
*/
#include "avcodec.h"
#include "mjpeg.h"
#include "mjpegdec.h"
#include "sp5x.h"
static int sp5x_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AVPacket avpkt_recoded;
#if 0
MJpegDecodeContext *s = avctx->priv_data;
#endif
const int qscale = 5;
const uint8_t *buf_ptr, *buf_end;
uint8_t *recoded;
int i = 0, j = 0;
if (!avctx->width || !avctx->height)
return -1;
buf_ptr = buf;
buf_end = buf + buf_size;
#if 1
recoded = av_mallocz(buf_size + 1024);
if (!recoded)
return -1;
/* SOI */
recoded[j++] = 0xFF;
recoded[j++] = 0xD8;
memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
j += sizeof(sp5x_data_dqt);
memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
j += sizeof(sp5x_data_dht);
memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
AV_WB16(recoded+j+5, avctx->coded_height);
AV_WB16(recoded+j+7, avctx->coded_width);
j += sizeof(sp5x_data_sof);
memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
j += sizeof(sp5x_data_sos);
if(avctx->codec_id==CODEC_ID_AMV)
for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
recoded[j++] = buf[i];
else
for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
{
recoded[j++] = buf[i];
if (buf[i] == 0xff)
recoded[j++] = 0;
}
/* EOI */
recoded[j++] = 0xFF;
recoded[j++] = 0xD9;
avctx->flags &= ~CODEC_FLAG_EMU_EDGE;
av_init_packet(&avpkt_recoded);
avpkt_recoded.data = recoded;
avpkt_recoded.size = j;
i = ff_mjpeg_decode_frame(avctx, data, data_size, &avpkt_recoded);
av_free(recoded);
#else
/* SOF */
s->bits = 8;
s->width = avctx->coded_width;
s->height = avctx->coded_height;
s->nb_components = 3;
s->component_id[0] = 0;
s->h_count[0] = 2;
s->v_count[0] = 2;
s->quant_index[0] = 0;
s->component_id[1] = 1;
s->h_count[1] = 1;
s->v_count[1] = 1;
s->quant_index[1] = 1;
s->component_id[2] = 2;
s->h_count[2] = 1;
s->v_count[2] = 1;
s->quant_index[2] = 1;
s->h_max = 2;
s->v_max = 2;
s->qscale_table = av_mallocz((s->width+15)/16);
avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420;
s->interlaced = 0;
s->picture.reference = 0;
if (avctx->get_buffer(avctx, &s->picture) < 0)
{
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
s->picture.pict_type = FF_I_TYPE;
s->picture.key_frame = 1;
for (i = 0; i < 3; i++)
s->linesize[i] = s->picture.linesize[i] << s->interlaced;
/* DQT */
for (i = 0; i < 64; i++)
{
j = s->scantable.permutated[i];
s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i];
}
s->qscale[0] = FFMAX(
s->quant_matrixes[0][s->scantable.permutated[1]],
s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1;
for (i = 0; i < 64; i++)
{
j = s->scantable.permutated[i];
s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i];
}
s->qscale[1] = FFMAX(
s->quant_matrixes[1][s->scantable.permutated[1]],
s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1;
/* DHT */
/* SOS */
s->comp_index[0] = 0;
s->nb_blocks[0] = s->h_count[0] * s->v_count[0];
s->h_scount[0] = s->h_count[0];
s->v_scount[0] = s->v_count[0];
s->dc_index[0] = 0;
s->ac_index[0] = 0;
s->comp_index[1] = 1;
s->nb_blocks[1] = s->h_count[1] * s->v_count[1];
s->h_scount[1] = s->h_count[1];
s->v_scount[1] = s->v_count[1];
s->dc_index[1] = 1;
s->ac_index[1] = 1;
s->comp_index[2] = 2;
s->nb_blocks[2] = s->h_count[2] * s->v_count[2];
s->h_scount[2] = s->h_count[2];
s->v_scount[2] = s->v_count[2];
s->dc_index[2] = 1;
s->ac_index[2] = 1;
for (i = 0; i < 3; i++)
s->last_dc[i] = 1024;
s->mb_width = (s->width * s->h_max * 8 -1) / (s->h_max * 8);
s->mb_height = (s->height * s->v_max * 8 -1) / (s->v_max * 8);
init_get_bits(&s->gb, buf+14, (buf_size-14)*8);
return mjpeg_decode_scan(s);
#endif
return i;
}
AVCodec sp5x_decoder = {
"sp5x",
CODEC_TYPE_VIDEO,
CODEC_ID_SP5X,
sizeof(MJpegDecodeContext),
ff_mjpeg_decode_init,
NULL,
ff_mjpeg_decode_end,
sp5x_decode_frame,
CODEC_CAP_DR1,
NULL,
.long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
};
AVCodec amv_decoder = {
"amv",
CODEC_TYPE_VIDEO,
CODEC_ID_AMV,
sizeof(MJpegDecodeContext),
ff_mjpeg_decode_init,
NULL,
ff_mjpeg_decode_end,
sp5x_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
};
|
