1
by Sérgio Benjamim
FFmpeg 2.7.1 source for ppsspp. |
1 |
/*
|
2 |
* Sony PlayStation MDEC (Motion DECoder)
|
|
3 |
* Copyright (c) 2003 Michael Niedermayer
|
|
4 |
*
|
|
5 |
* based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl>
|
|
6 |
*
|
|
7 |
* This file is part of FFmpeg.
|
|
8 |
*
|
|
9 |
* FFmpeg is free software; you can redistribute it and/or
|
|
10 |
* modify it under the terms of the GNU Lesser General Public
|
|
11 |
* License as published by the Free Software Foundation; either
|
|
12 |
* version 2.1 of the License, or (at your option) any later version.
|
|
13 |
*
|
|
14 |
* FFmpeg is distributed in the hope that it will be useful,
|
|
15 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
16 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
17 |
* Lesser General Public License for more details.
|
|
18 |
*
|
|
19 |
* You should have received a copy of the GNU Lesser General Public
|
|
20 |
* License along with FFmpeg; if not, write to the Free Software
|
|
21 |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
22 |
*/
|
|
23 |
||
24 |
/**
|
|
25 |
* @file
|
|
26 |
* Sony PlayStation MDEC (Motion DECoder)
|
|
27 |
* This is very similar to intra-only MPEG-1.
|
|
28 |
*/
|
|
29 |
||
30 |
#include "avcodec.h" |
|
31 |
#include "blockdsp.h" |
|
32 |
#include "bswapdsp.h" |
|
33 |
#include "idctdsp.h" |
|
34 |
#include "mpegvideo.h" |
|
35 |
#include "mpeg12.h" |
|
36 |
#include "thread.h" |
|
37 |
||
38 |
typedef struct MDECContext { |
|
39 |
AVCodecContext *avctx; |
|
40 |
BlockDSPContext bdsp; |
|
41 |
BswapDSPContext bbdsp; |
|
42 |
IDCTDSPContext idsp; |
|
43 |
ThreadFrame frame; |
|
44 |
GetBitContext gb; |
|
45 |
ScanTable scantable; |
|
46 |
int version; |
|
47 |
int qscale; |
|
48 |
int last_dc[3]; |
|
49 |
int mb_width; |
|
50 |
int mb_height; |
|
51 |
int mb_x, mb_y; |
|
52 |
DECLARE_ALIGNED(16, int16_t, block)[6][64]; |
|
53 |
uint8_t *bitstream_buffer; |
|
54 |
unsigned int bitstream_buffer_size; |
|
55 |
int block_last_index[6]; |
|
56 |
} MDECContext; |
|
57 |
||
58 |
//very similar to MPEG-1
|
|
59 |
static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n) |
|
60 |
{
|
|
61 |
int level, diff, i, j, run; |
|
62 |
int component; |
|
63 |
RLTable *rl = &ff_rl_mpeg1; |
|
64 |
uint8_t * const scantable = a->scantable.permutated; |
|
65 |
const uint16_t *quant_matrix = ff_mpeg1_default_intra_matrix; |
|
66 |
const int qscale = a->qscale; |
|
67 |
||
68 |
/* DC coefficient */
|
|
69 |
if (a->version == 2) { |
|
70 |
block[0] = 2 * get_sbits(&a->gb, 10) + 1024; |
|
71 |
} else { |
|
72 |
component = (n <= 3 ? 0 : n - 4 + 1); |
|
73 |
diff = decode_dc(&a->gb, component); |
|
74 |
if (diff >= 0xffff) |
|
75 |
return AVERROR_INVALIDDATA; |
|
76 |
a->last_dc[component] += diff; |
|
77 |
block[0] = a->last_dc[component] << 3; |
|
78 |
}
|
|
79 |
||
80 |
i = 0; |
|
81 |
{
|
|
82 |
OPEN_READER(re, &a->gb); |
|
83 |
/* now quantify & encode AC coefficients */
|
|
84 |
for (;;) { |
|
85 |
UPDATE_CACHE(re, &a->gb); |
|
86 |
GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); |
|
87 |
||
88 |
if (level == 127) { |
|
89 |
break; |
|
90 |
} else if (level != 0) { |
|
91 |
i += run; |
|
92 |
if (i > 63) { |
|
93 |
av_log(a->avctx, AV_LOG_ERROR, |
|
94 |
"ac-tex damaged at %d %d\n", a->mb_x, a->mb_y); |
|
95 |
return AVERROR_INVALIDDATA; |
|
96 |
}
|
|
97 |
j = scantable[i]; |
|
98 |
level = (level * qscale * quant_matrix[j]) >> 3; |
|
99 |
level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1); |
|
100 |
LAST_SKIP_BITS(re, &a->gb, 1); |
|
101 |
} else { |
|
102 |
/* escape */
|
|
103 |
run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6); |
|
104 |
UPDATE_CACHE(re, &a->gb); |
|
105 |
level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10); |
|
106 |
i += run; |
|
107 |
if (i > 63) { |
|
108 |
av_log(a->avctx, AV_LOG_ERROR, |
|
109 |
"ac-tex damaged at %d %d\n", a->mb_x, a->mb_y); |
|
110 |
return AVERROR_INVALIDDATA; |
|
111 |
}
|
|
112 |
j = scantable[i]; |
|
113 |
if (level < 0) { |
|
114 |
level = -level; |
|
115 |
level = (level * qscale * quant_matrix[j]) >> 3; |
|
116 |
level = (level - 1) | 1; |
|
117 |
level = -level; |
|
118 |
} else { |
|
119 |
level = (level * qscale * quant_matrix[j]) >> 3; |
|
120 |
level = (level - 1) | 1; |
|
121 |
}
|
|
122 |
}
|
|
123 |
||
124 |
block[j] = level; |
|
125 |
}
|
|
126 |
CLOSE_READER(re, &a->gb); |
|
127 |
}
|
|
128 |
a->block_last_index[n] = i; |
|
129 |
return 0; |
|
130 |
}
|
|
131 |
||
132 |
static inline int decode_mb(MDECContext *a, int16_t block[6][64]) |
|
133 |
{
|
|
134 |
int i, ret; |
|
135 |
static const int block_index[6] = { 5, 4, 0, 1, 2, 3 }; |
|
136 |
||
137 |
a->bdsp.clear_blocks(block[0]); |
|
138 |
||
139 |
for (i = 0; i < 6; i++) { |
|
140 |
if ((ret = mdec_decode_block_intra(a, block[block_index[i]], |
|
141 |
block_index[i])) < 0) |
|
142 |
return ret; |
|
143 |
if (get_bits_left(&a->gb) < 0) |
|
144 |
return AVERROR_INVALIDDATA; |
|
145 |
}
|
|
146 |
return 0; |
|
147 |
}
|
|
148 |
||
149 |
static inline void idct_put(MDECContext *a, AVFrame *frame, int mb_x, int mb_y) |
|
150 |
{
|
|
151 |
int16_t (*block)[64] = a->block; |
|
152 |
int linesize = frame->linesize[0]; |
|
153 |
||
154 |
uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16; |
|
155 |
uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; |
|
156 |
uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; |
|
157 |
||
158 |
a->idsp.idct_put(dest_y, linesize, block[0]); |
|
159 |
a->idsp.idct_put(dest_y + 8, linesize, block[1]); |
|
160 |
a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]); |
|
161 |
a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]); |
|
162 |
||
163 |
if (!(a->avctx->flags & CODEC_FLAG_GRAY)) { |
|
164 |
a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]); |
|
165 |
a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]); |
|
166 |
}
|
|
167 |
}
|
|
168 |
||
169 |
static int decode_frame(AVCodecContext *avctx, |
|
170 |
void *data, int *got_frame, |
|
171 |
AVPacket *avpkt) |
|
172 |
{
|
|
173 |
MDECContext * const a = avctx->priv_data; |
|
174 |
const uint8_t *buf = avpkt->data; |
|
175 |
int buf_size = avpkt->size; |
|
176 |
ThreadFrame frame = { .f = data }; |
|
177 |
int ret; |
|
178 |
||
179 |
if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) |
|
180 |
return ret; |
|
181 |
frame.f->pict_type = AV_PICTURE_TYPE_I; |
|
182 |
frame.f->key_frame = 1; |
|
183 |
||
184 |
av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size); |
|
185 |
if (!a->bitstream_buffer) |
|
186 |
return AVERROR(ENOMEM); |
|
187 |
a->bbdsp.bswap16_buf((uint16_t *)a->bitstream_buffer, (uint16_t *)buf, (buf_size + 1) / 2); |
|
188 |
if ((ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size)) < 0) |
|
189 |
return ret; |
|
190 |
||
191 |
/* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
|
|
192 |
skip_bits(&a->gb, 32); |
|
193 |
||
194 |
a->qscale = get_bits(&a->gb, 16); |
|
195 |
a->version = get_bits(&a->gb, 16); |
|
196 |
||
197 |
a->last_dc[0] = a->last_dc[1] = a->last_dc[2] = 128; |
|
198 |
||
199 |
for (a->mb_x = 0; a->mb_x < a->mb_width; a->mb_x++) { |
|
200 |
for (a->mb_y = 0; a->mb_y < a->mb_height; a->mb_y++) { |
|
201 |
if ((ret = decode_mb(a, a->block)) < 0) |
|
202 |
return ret; |
|
203 |
||
204 |
idct_put(a, frame.f, a->mb_x, a->mb_y); |
|
205 |
}
|
|
206 |
}
|
|
207 |
||
208 |
*got_frame = 1; |
|
209 |
||
210 |
return (get_bits_count(&a->gb) + 31) / 32 * 4; |
|
211 |
}
|
|
212 |
||
213 |
static av_cold int decode_init(AVCodecContext *avctx) |
|
214 |
{
|
|
215 |
MDECContext * const a = avctx->priv_data; |
|
216 |
||
217 |
a->mb_width = (avctx->coded_width + 15) / 16; |
|
218 |
a->mb_height = (avctx->coded_height + 15) / 16; |
|
219 |
||
220 |
a->avctx = avctx; |
|
221 |
||
222 |
ff_blockdsp_init(&a->bdsp, avctx); |
|
223 |
ff_bswapdsp_init(&a->bbdsp); |
|
224 |
ff_idctdsp_init(&a->idsp, avctx); |
|
225 |
ff_mpeg12_init_vlcs(); |
|
226 |
ff_init_scantable(a->idsp.idct_permutation, &a->scantable, |
|
227 |
ff_zigzag_direct); |
|
228 |
||
229 |
if (avctx->idct_algo == FF_IDCT_AUTO) |
|
230 |
avctx->idct_algo = FF_IDCT_SIMPLE; |
|
231 |
avctx->pix_fmt = AV_PIX_FMT_YUVJ420P; |
|
232 |
avctx->color_range = AVCOL_RANGE_JPEG; |
|
233 |
||
234 |
return 0; |
|
235 |
}
|
|
236 |
||
237 |
static av_cold int decode_init_thread_copy(AVCodecContext *avctx) |
|
238 |
{
|
|
239 |
MDECContext * const a = avctx->priv_data; |
|
240 |
||
241 |
a->avctx = avctx; |
|
242 |
||
243 |
return 0; |
|
244 |
}
|
|
245 |
||
246 |
static av_cold int decode_end(AVCodecContext *avctx) |
|
247 |
{
|
|
248 |
MDECContext * const a = avctx->priv_data; |
|
249 |
||
250 |
av_freep(&a->bitstream_buffer); |
|
251 |
a->bitstream_buffer_size = 0; |
|
252 |
||
253 |
return 0; |
|
254 |
}
|
|
255 |
||
256 |
AVCodec ff_mdec_decoder = { |
|
257 |
.name = "mdec", |
|
258 |
.long_name = NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"), |
|
259 |
.type = AVMEDIA_TYPE_VIDEO, |
|
260 |
.id = AV_CODEC_ID_MDEC, |
|
261 |
.priv_data_size = sizeof(MDECContext), |
|
262 |
.init = decode_init, |
|
263 |
.close = decode_end, |
|
264 |
.decode = decode_frame, |
|
265 |
.capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, |
|
266 |
.init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy) |
|
267 |
};
|