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
|
/*
* Electronic Arts TQI Video Decoder
* Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Electronic Arts TQI Video Decoder
* @author Peter Ross <pross@xvid.org>
* @see http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
*/
#include "avcodec.h"
#include "blockdsp.h"
#include "bswapdsp.h"
#include "get_bits.h"
#include "aandcttab.h"
#include "eaidct.h"
#include "idctdsp.h"
#include "internal.h"
#include "mpeg12.h"
typedef struct TqiContext {
AVCodecContext *avctx;
GetBitContext gb;
BlockDSPContext bdsp;
BswapDSPContext bsdsp;
IDCTDSPContext idsp;
ScanTable intra_scantable;
void *bitstream_buf;
unsigned int bitstream_buf_size;
int mb_x, mb_y;
uint16_t intra_matrix[64];
int last_dc[3];
DECLARE_ALIGNED(32, int16_t, block)[6][64];
} TqiContext;
static av_cold int tqi_decode_init(AVCodecContext *avctx)
{
TqiContext *t = avctx->priv_data;
ff_blockdsp_init(&t->bdsp, avctx);
ff_bswapdsp_init(&t->bsdsp);
ff_idctdsp_init(&t->idsp, avctx);
ff_init_scantable_permutation(t->idsp.idct_permutation, FF_IDCT_PERM_NONE);
ff_init_scantable(t->idsp.idct_permutation, &t->intra_scantable, ff_zigzag_direct);
avctx->framerate = (AVRational){ 15, 1 };
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
ff_mpeg12_init_vlcs();
return 0;
}
static int tqi_decode_mb(TqiContext *t, int16_t (*block)[64])
{
int n;
t->bdsp.clear_blocks(block[0]);
for (n = 0; n < 6; n++) {
int ret = ff_mpeg1_decode_block_intra(&t->gb,
t->intra_matrix,
t->intra_scantable.permutated,
t->last_dc, block[n], n, 1);
if (ret < 0) {
av_log(t->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
t->mb_x, t->mb_y);
return -1;
}
}
return 0;
}
static inline void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame,
int16_t (*block)[64])
{
TqiContext *t = avctx->priv_data;
ptrdiff_t linesize = frame->linesize[0];
uint8_t *dest_y = frame->data[0] + t->mb_y * 16 * linesize + t->mb_x * 16;
uint8_t *dest_cb = frame->data[1] + t->mb_y * 8 * frame->linesize[1] + t->mb_x * 8;
uint8_t *dest_cr = frame->data[2] + t->mb_y * 8 * frame->linesize[2] + t->mb_x * 8;
ff_ea_idct_put_c(dest_y , linesize, block[0]);
ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
if (!(avctx->flags & AV_CODEC_FLAG_GRAY)) {
ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
}
}
static void tqi_calculate_qtable(TqiContext *t, int quant)
{
const int64_t qscale = (215 - 2*quant)*5;
int i;
t->intra_matrix[0] = (ff_inv_aanscales[0] * ff_mpeg1_default_intra_matrix[0]) >> 11;
for(i=1; i<64; i++)
t->intra_matrix[i] = (ff_inv_aanscales[i] * ff_mpeg1_default_intra_matrix[i] * qscale + 32) >> 14;
}
static int tqi_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
const uint8_t *buf_end = buf+buf_size;
TqiContext *t = avctx->priv_data;
AVFrame *frame = data;
int ret, w, h;
if (buf_size < 12)
return AVERROR_INVALIDDATA;
t->avctx = avctx;
w = AV_RL16(&buf[0]);
h = AV_RL16(&buf[2]);
tqi_calculate_qtable(t, buf[4]);
buf += 8;
ret = ff_set_dimensions(avctx, w, h);
if (ret < 0)
return ret;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
buf_end - buf);
if (!t->bitstream_buf)
return AVERROR(ENOMEM);
t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
(buf_end - buf) / 4);
init_get_bits(&t->gb, t->bitstream_buf, 8 * (buf_end - buf));
t->last_dc[0] =
t->last_dc[1] =
t->last_dc[2] = 0;
for (t->mb_y = 0; t->mb_y < (h + 15) / 16; t->mb_y++) {
for (t->mb_x = 0; t->mb_x < (w + 15) / 16; t->mb_x++) {
if (tqi_decode_mb(t, t->block) < 0)
goto end;
tqi_idct_put(avctx, frame, t->block);
}
}
end:
*got_frame = 1;
return buf_size;
}
static av_cold int tqi_decode_end(AVCodecContext *avctx)
{
TqiContext *t = avctx->priv_data;
av_freep(&t->bitstream_buf);
return 0;
}
AVCodec ff_eatqi_decoder = {
.name = "eatqi",
.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_TQI,
.priv_data_size = sizeof(TqiContext),
.init = tqi_decode_init,
.close = tqi_decode_end,
.decode = tqi_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
};
|
