a07d6e564bf5f3530c9d003434443bdfb17e5cba
[libav.git] / libavcodec / mdec.c
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 Libav.
8 *
9 * Libav 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 * Libav 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 Libav; 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 "dsputil.h"
32 #include "mpegvideo.h"
33 #include "mpeg12.h"
34 #include "thread.h"
35
36 typedef struct MDECContext{
37 AVCodecContext *avctx;
38 DSPContext dsp;
39 AVFrame picture;
40 GetBitContext gb;
41 ScanTable scantable;
42 int version;
43 int qscale;
44 int last_dc[3];
45 int mb_width;
46 int mb_height;
47 int mb_x, mb_y;
48 DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
49 uint8_t *bitstream_buffer;
50 unsigned int bitstream_buffer_size;
51 int block_last_index[6];
52 } MDECContext;
53
54 //very similar to MPEG-1
55 static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n)
56 {
57 int level, diff, i, j, run;
58 int component;
59 RLTable *rl = &ff_rl_mpeg1;
60 uint8_t * const scantable= a->scantable.permutated;
61 const uint16_t *quant_matrix= ff_mpeg1_default_intra_matrix;
62 const int qscale= a->qscale;
63
64 /* DC coefficient */
65 if(a->version==2){
66 block[0]= 2*get_sbits(&a->gb, 10) + 1024;
67 }else{
68 component = (n <= 3 ? 0 : n - 4 + 1);
69 diff = decode_dc(&a->gb, component);
70 if (diff >= 0xffff)
71 return -1;
72 a->last_dc[component]+= diff;
73 block[0] = a->last_dc[component]<<3;
74 }
75
76 i = 0;
77 {
78 OPEN_READER(re, &a->gb);
79 /* now quantify & encode AC coefficients */
80 for(;;) {
81 UPDATE_CACHE(re, &a->gb);
82 GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
83
84 if(level == 127){
85 break;
86 } else if(level != 0) {
87 i += run;
88 j = scantable[i];
89 level= (level*qscale*quant_matrix[j])>>3;
90 level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1);
91 LAST_SKIP_BITS(re, &a->gb, 1);
92 } else {
93 /* escape */
94 run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
95 UPDATE_CACHE(re, &a->gb);
96 level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
97 i += run;
98 j = scantable[i];
99 if(level<0){
100 level= -level;
101 level= (level*qscale*quant_matrix[j])>>3;
102 level= (level-1)|1;
103 level= -level;
104 }else{
105 level= (level*qscale*quant_matrix[j])>>3;
106 level= (level-1)|1;
107 }
108 }
109 if (i > 63){
110 av_log(a->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
111 return -1;
112 }
113
114 block[j] = level;
115 }
116 CLOSE_READER(re, &a->gb);
117 }
118 a->block_last_index[n] = i;
119 return 0;
120 }
121
122 static inline int decode_mb(MDECContext *a, DCTELEM block[6][64]){
123 int i;
124 const int block_index[6]= {5,4,0,1,2,3};
125
126 a->dsp.clear_blocks(block[0]);
127
128 for(i=0; i<6; i++){
129 if( mdec_decode_block_intra(a, block[ block_index[i] ], block_index[i]) < 0 ||
130 get_bits_left(&a->gb) < 0)
131 return -1;
132 }
133 return 0;
134 }
135
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];
139
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;
143
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]);
148
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]);
152 }
153 }
154
155 static int decode_frame(AVCodecContext *avctx,
156 void *data, int *data_size,
157 AVPacket *avpkt)
158 {
159 const uint8_t *buf = avpkt->data;
160 int buf_size = avpkt->size;
161 MDECContext * const a = avctx->priv_data;
162 AVFrame *picture = data;
163 AVFrame * const p= &a->picture;
164 int i;
165
166 if(p->data[0])
167 ff_thread_release_buffer(avctx, p);
168
169 p->reference= 0;
170 if(ff_thread_get_buffer(avctx, p) < 0){
171 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
172 return -1;
173 }
174 p->pict_type= AV_PICTURE_TYPE_I;
175 p->key_frame= 1;
176
177 av_fast_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
178 if (!a->bitstream_buffer)
179 return AVERROR(ENOMEM);
180 for(i=0; i<buf_size; i+=2){
181 a->bitstream_buffer[i] = buf[i+1];
182 a->bitstream_buffer[i+1]= buf[i ];
183 }
184 init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
185
186 /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
187 skip_bits(&a->gb, 32);
188
189 a->qscale= get_bits(&a->gb, 16);
190 a->version= get_bits(&a->gb, 16);
191
192 a->last_dc[0]=
193 a->last_dc[1]=
194 a->last_dc[2]= 128;
195
196 for(a->mb_x=0; a->mb_x<a->mb_width; a->mb_x++){
197 for(a->mb_y=0; a->mb_y<a->mb_height; a->mb_y++){
198 if( decode_mb(a, a->block) <0)
199 return -1;
200
201 idct_put(a, a->mb_x, a->mb_y);
202 }
203 }
204
205 p->quality= a->qscale * FF_QP2LAMBDA;
206 memset(p->qscale_table, a->qscale, a->mb_width);
207
208 *picture = a->picture;
209 *data_size = sizeof(AVPicture);
210
211 return (get_bits_count(&a->gb)+31)/32*4;
212 }
213
214 static av_cold void mdec_common_init(AVCodecContext *avctx){
215 MDECContext * const a = avctx->priv_data;
216
217 ff_dsputil_init(&a->dsp, avctx);
218
219 a->mb_width = (avctx->coded_width + 15) / 16;
220 a->mb_height = (avctx->coded_height + 15) / 16;
221
222 avctx->coded_frame= &a->picture;
223 a->avctx= avctx;
224 }
225
226 static av_cold int decode_init(AVCodecContext *avctx){
227 MDECContext * const a = avctx->priv_data;
228 AVFrame *p= &a->picture;
229
230 mdec_common_init(avctx);
231 ff_mpeg12_init_vlcs();
232 ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_zigzag_direct);
233
234 if( avctx->idct_algo == FF_IDCT_AUTO )
235 avctx->idct_algo = FF_IDCT_SIMPLE;
236 p->qstride= 0;
237 p->qscale_table= av_mallocz(a->mb_width);
238 avctx->pix_fmt= AV_PIX_FMT_YUVJ420P;
239
240 return 0;
241 }
242
243 static av_cold int decode_init_thread_copy(AVCodecContext *avctx){
244 MDECContext * const a = avctx->priv_data;
245 AVFrame *p = &a->picture;
246
247 avctx->coded_frame = p;
248 a->avctx= avctx;
249
250 p->qscale_table = av_mallocz( a->mb_width);
251
252 return 0;
253 }
254
255 static av_cold int decode_end(AVCodecContext *avctx){
256 MDECContext * const a = avctx->priv_data;
257
258 if(a->picture.data[0])
259 avctx->release_buffer(avctx, &a->picture);
260 av_freep(&a->bitstream_buffer);
261 av_freep(&a->picture.qscale_table);
262 a->bitstream_buffer_size=0;
263
264 return 0;
265 }
266
267 AVCodec ff_mdec_decoder = {
268 .name = "mdec",
269 .type = AVMEDIA_TYPE_VIDEO,
270 .id = AV_CODEC_ID_MDEC,
271 .priv_data_size = sizeof(MDECContext),
272 .init = decode_init,
273 .close = decode_end,
274 .decode = decode_frame,
275 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
276 .long_name = NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"),
277 .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy)
278 };