2 * Sony PlayStation MDEC (Motion DECoder)
3 * Copyright (c) 2003 Michael Niedermayer
5 * based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl>
7 * This file is part of FFmpeg.
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.
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.
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
26 * Sony PlayStation MDEC (Motion DECoder)
27 * This is very similar to intra-only MPEG-1.
32 #include "mpegvideo.h"
35 typedef struct MDECContext
{
36 AVCodecContext
*avctx
;
47 DECLARE_ALIGNED_16(DCTELEM
, block
[6][64]);
48 DECLARE_ALIGNED_8(uint16_t, intra_matrix
[64]);
49 DECLARE_ALIGNED_8(int, q_intra_matrix
[64]);
50 uint8_t *bitstream_buffer
;
51 unsigned int bitstream_buffer_size
;
52 int block_last_index
[6];
55 //very similar to MPEG-1
56 static inline int mdec_decode_block_intra(MDECContext
*a
, DCTELEM
*block
, int n
)
58 int level
, diff
, i
, j
, run
;
60 RLTable
*rl
= &ff_rl_mpeg1
;
61 uint8_t * const scantable
= a
->scantable
.permutated
;
62 const uint16_t *quant_matrix
= ff_mpeg1_default_intra_matrix
;
63 const int qscale
= a
->qscale
;
67 block
[0]= 2*get_sbits(&a
->gb
, 10) + 1024;
69 component
= (n
<= 3 ? 0 : n
- 4 + 1);
70 diff
= decode_dc(&a
->gb
, component
);
73 a
->last_dc
[component
]+= diff
;
74 block
[0] = a
->last_dc
[component
]<<3;
79 OPEN_READER(re
, &a
->gb
);
80 /* now quantify & encode AC coefficients */
82 UPDATE_CACHE(re
, &a
->gb
);
83 GET_RL_VLC(level
, run
, re
, &a
->gb
, rl
->rl_vlc
[0], TEX_VLC_BITS
, 2, 0);
87 } else if(level
!= 0) {
90 level
= (level
*qscale
*quant_matrix
[j
])>>3;
91 level
= (level
^ SHOW_SBITS(re
, &a
->gb
, 1)) - SHOW_SBITS(re
, &a
->gb
, 1);
92 LAST_SKIP_BITS(re
, &a
->gb
, 1);
95 run
= SHOW_UBITS(re
, &a
->gb
, 6)+1; LAST_SKIP_BITS(re
, &a
->gb
, 6);
96 UPDATE_CACHE(re
, &a
->gb
);
97 level
= SHOW_SBITS(re
, &a
->gb
, 10); SKIP_BITS(re
, &a
->gb
, 10);
102 level
= (level
*qscale
*quant_matrix
[j
])>>3;
106 level
= (level
*qscale
*quant_matrix
[j
])>>3;
111 av_log(a
->avctx
, AV_LOG_ERROR
, "ac-tex damaged at %d %d\n", a
->mb_x
, a
->mb_y
);
117 CLOSE_READER(re
, &a
->gb
);
119 a
->block_last_index
[n
] = i
;
123 static inline int decode_mb(MDECContext
*a
, DCTELEM block
[6][64]){
125 const int block_index
[6]= {5,4,0,1,2,3};
127 a
->dsp
.clear_blocks(block
[0]);
130 if( mdec_decode_block_intra(a
, block
[ block_index
[i
] ], block_index
[i
]) < 0)
136 static inline void idct_put(MDECContext
*a
, int mb_x
, int mb_y
){
137 DCTELEM (*block
)[64]= a
->block
;
138 int linesize
= a
->picture
.linesize
[0];
140 uint8_t *dest_y
= a
->picture
.data
[0] + (mb_y
* 16* linesize
) + mb_x
* 16;
141 uint8_t *dest_cb
= a
->picture
.data
[1] + (mb_y
* 8 * a
->picture
.linesize
[1]) + mb_x
* 8;
142 uint8_t *dest_cr
= a
->picture
.data
[2] + (mb_y
* 8 * a
->picture
.linesize
[2]) + mb_x
* 8;
144 a
->dsp
.idct_put(dest_y
, linesize
, block
[0]);
145 a
->dsp
.idct_put(dest_y
+ 8, linesize
, block
[1]);
146 a
->dsp
.idct_put(dest_y
+ 8*linesize
, linesize
, block
[2]);
147 a
->dsp
.idct_put(dest_y
+ 8*linesize
+ 8, linesize
, block
[3]);
149 if(!(a
->avctx
->flags
&CODEC_FLAG_GRAY
)){
150 a
->dsp
.idct_put(dest_cb
, a
->picture
.linesize
[1], block
[4]);
151 a
->dsp
.idct_put(dest_cr
, a
->picture
.linesize
[2], block
[5]);
155 static int decode_frame(AVCodecContext
*avctx
,
156 void *data
, int *data_size
,
157 const uint8_t *buf
, int buf_size
)
159 MDECContext
* const a
= avctx
->priv_data
;
160 AVFrame
*picture
= data
;
161 AVFrame
* const p
= &a
->picture
;
165 avctx
->release_buffer(avctx
, p
);
168 if(avctx
->get_buffer(avctx
, p
) < 0){
169 av_log(avctx
, AV_LOG_ERROR
, "get_buffer() failed\n");
172 p
->pict_type
= FF_I_TYPE
;
175 a
->bitstream_buffer
= av_fast_realloc(a
->bitstream_buffer
, &a
->bitstream_buffer_size
, buf_size
+ FF_INPUT_BUFFER_PADDING_SIZE
);
176 for(i
=0; i
<buf_size
; i
+=2){
177 a
->bitstream_buffer
[i
] = buf
[i
+1];
178 a
->bitstream_buffer
[i
+1]= buf
[i
];
180 init_get_bits(&a
->gb
, a
->bitstream_buffer
, buf_size
*8);
182 /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
183 skip_bits(&a
->gb
, 32);
185 a
->qscale
= get_bits(&a
->gb
, 16);
186 a
->version
= get_bits(&a
->gb
, 16);
192 for(a
->mb_x
=0; a
->mb_x
<a
->mb_width
; a
->mb_x
++){
193 for(a
->mb_y
=0; a
->mb_y
<a
->mb_height
; a
->mb_y
++){
194 if( decode_mb(a
, a
->block
) <0)
197 idct_put(a
, a
->mb_x
, a
->mb_y
);
201 p
->quality
= a
->qscale
* FF_QP2LAMBDA
;
202 memset(p
->qscale_table
, a
->qscale
, p
->qstride
*a
->mb_height
);
204 *picture
= a
->picture
;
205 *data_size
= sizeof(AVPicture
);
207 return (get_bits_count(&a
->gb
)+31)/32*4;
210 static av_cold
void mdec_common_init(AVCodecContext
*avctx
){
211 MDECContext
* const a
= avctx
->priv_data
;
213 dsputil_init(&a
->dsp
, avctx
);
215 a
->mb_width
= (avctx
->coded_width
+ 15) / 16;
216 a
->mb_height
= (avctx
->coded_height
+ 15) / 16;
218 avctx
->coded_frame
= &a
->picture
;
222 static av_cold
int decode_init(AVCodecContext
*avctx
){
223 MDECContext
* const a
= avctx
->priv_data
;
224 AVFrame
*p
= &a
->picture
;
226 mdec_common_init(avctx
);
227 ff_mpeg12_init_vlcs();
228 ff_init_scantable(a
->dsp
.idct_permutation
, &a
->scantable
, ff_zigzag_direct
);
230 p
->qstride
= a
->mb_width
;
231 p
->qscale_table
= av_mallocz( p
->qstride
* a
->mb_height
);
232 avctx
->pix_fmt
= PIX_FMT_YUV420P
;
237 static av_cold
int decode_end(AVCodecContext
*avctx
){
238 MDECContext
* const a
= avctx
->priv_data
;
240 av_freep(&a
->bitstream_buffer
);
241 av_freep(&a
->picture
.qscale_table
);
242 a
->bitstream_buffer_size
=0;
247 AVCodec mdec_decoder
= {
257 .long_name
= NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"),