lowres width/height cleanup 3rd try
[libav.git] / libavcodec / mdec.c
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1/*
2 * PSX MDEC codec
3 * Copyright (c) 2003 Michael Niedermayer
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 * based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl>
20 */
21
22/**
23 * @file mdec.c
24 * PSX MDEC codec.
25 * This is very similar to intra only MPEG1.
26 */
27
28#include "avcodec.h"
29#include "dsputil.h"
30#include "mpegvideo.h"
31
32//#undef NDEBUG
33//#include <assert.h>
34
35typedef struct MDECContext{
36 AVCodecContext *avctx;
37 DSPContext dsp;
38 AVFrame picture;
39 PutBitContext pb;
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 DCTELEM __align8 block[6][64];
49 uint16_t __align8 intra_matrix[64];
50 int __align8 q_intra_matrix[64];
51 uint8_t *bitstream_buffer;
52 int bitstream_buffer_size;
53 int block_last_index[6];
54} MDECContext;
55
56//very similar to mpeg1
57static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n)
58{
59 int level, diff, i, j, run;
60 int component;
61 RLTable *rl = &rl_mpeg1;
62 uint8_t * const scantable= a->scantable.permutated;
63 const uint16_t *quant_matrix= ff_mpeg1_default_intra_matrix;
64 const int qscale= a->qscale;
65
66 /* DC coef */
67 if(a->version==2){
67b04c1a 68 block[0]= 2*get_sbits(&a->gb, 10) + 1024;
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69 }else{
70 component = (n <= 3 ? 0 : n - 4 + 1);
71 diff = decode_dc(&a->gb, component);
72 if (diff >= 0xffff)
73 return -1;
74 a->last_dc[component]+= diff;
75 block[0] = a->last_dc[component]<<3;
76 }
77
78 i = 0;
79 {
80 OPEN_READER(re, &a->gb);
81 /* now quantify & encode AC coefs */
82 for(;;) {
83 UPDATE_CACHE(re, &a->gb);
84 GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
85
86 if(level == 127){
87 break;
88 } else if(level != 0) {
89 i += run;
90 j = scantable[i];
91 level= (level*qscale*quant_matrix[j])>>3;
67b04c1a 92// level= (level-1)|1;
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93 level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1);
94 LAST_SKIP_BITS(re, &a->gb, 1);
95 } else {
96 /* escape */
97 run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
98 UPDATE_CACHE(re, &a->gb);
bf5d0505 99 level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
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100 i += run;
101 j = scantable[i];
67b04c1a 102 if(level<0){
c3bf0288 103 level= -level;
67b04c1a 104 level= (level*qscale*quant_matrix[j])>>3;
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105 level= (level-1)|1;
106 level= -level;
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107 }else{
108 level= (level*qscale*quant_matrix[j])>>3;
109 level= (level-1)|1;
110 }
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111 }
112 if (i > 63){
9b879566 113 av_log(a->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
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114 return -1;
115 }
116
117 block[j] = level;
118 }
119 CLOSE_READER(re, &a->gb);
120 }
121 a->block_last_index[n] = i;
122 return 0;
123}
124
125static inline int decode_mb(MDECContext *a, DCTELEM block[6][64]){
126 int i;
77ee78bc 127 const int block_index[6]= {5,4,0,1,2,3};
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128
129 a->dsp.clear_blocks(block[0]);
130
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131 for(i=0; i<6; i++){
132 if( mdec_decode_block_intra(a, block[ block_index[i] ], block_index[i]) < 0)
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133 return -1;
134 }
135 return 0;
136}
137
138static inline void idct_put(MDECContext *a, int mb_x, int mb_y){
139 DCTELEM (*block)[64]= a->block;
140 int linesize= a->picture.linesize[0];
141
142 uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
143 uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
144 uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
145
146 a->dsp.idct_put(dest_y , linesize, block[0]);
147 a->dsp.idct_put(dest_y + 8, linesize, block[1]);
148 a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
149 a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
150
151 if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
152 a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
153 a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
154 }
155}
156
157static int decode_frame(AVCodecContext *avctx,
158 void *data, int *data_size,
159 uint8_t *buf, int buf_size)
160{
161 MDECContext * const a = avctx->priv_data;
162 AVFrame *picture = data;
163 AVFrame * const p= (AVFrame*)&a->picture;
164 int i;
165
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166 /* special case for last picture */
167 if (buf_size == 0) {
168 return 0;
169 }
170
171 if(p->data[0])
172 avctx->release_buffer(avctx, p);
173
174 p->reference= 0;
175 if(avctx->get_buffer(avctx, p) < 0){
9b879566 176 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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177 return -1;
178 }
179 p->pict_type= I_TYPE;
180 p->key_frame= 1;
181 a->last_dc[0]=
182 a->last_dc[1]=
183 a->last_dc[2]= 0;
184
185 a->bitstream_buffer= av_fast_realloc(a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
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186 for(i=0; i<buf_size; i+=2){
187 a->bitstream_buffer[i] = buf[i+1];
188 a->bitstream_buffer[i+1]= buf[i ];
c3bf0288 189 }
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190 init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
191
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192 /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
193 skip_bits(&a->gb, 32);
194
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195 a->qscale= get_bits(&a->gb, 16);
196 a->version= get_bits(&a->gb, 16);
c3bf0288 197
e986b6e2 198// printf("qscale:%d (0x%X), version:%d (0x%X)\n", a->qscale, a->qscale, a->version, a->version);
c3bf0288 199
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200 for(a->mb_x=0; a->mb_x<a->mb_width; a->mb_x++){
201 for(a->mb_y=0; a->mb_y<a->mb_height; a->mb_y++){
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202 if( decode_mb(a, a->block) <0)
203 return -1;
204
205 idct_put(a, a->mb_x, a->mb_y);
206 }
207 }
208
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209// p->quality= (32 + a->inv_qscale/2)/a->inv_qscale;
210// memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
211
212 *picture= *(AVFrame*)&a->picture;
213 *data_size = sizeof(AVPicture);
214
215 emms_c();
216
217 return (get_bits_count(&a->gb)+31)/32*4;
218}
219
220static void mdec_common_init(AVCodecContext *avctx){
221 MDECContext * const a = avctx->priv_data;
222
223 dsputil_init(&a->dsp, avctx);
224
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225 a->mb_width = (avctx->coded_width + 15) / 16;
226 a->mb_height = (avctx->coded_height + 15) / 16;
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227
228 avctx->coded_frame= (AVFrame*)&a->picture;
229 a->avctx= avctx;
230}
231
232static int decode_init(AVCodecContext *avctx){
233 MDECContext * const a = avctx->priv_data;
234 AVFrame *p= (AVFrame*)&a->picture;
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235
236 mdec_common_init(avctx);
237 init_vlcs();
238 ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_zigzag_direct);
239/*
240 for(i=0; i<64; i++){
241 int index= ff_zigzag_direct[i];
242 a->intra_matrix[i]= 64*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
243 }
244*/
245 p->qstride= a->mb_width;
246 p->qscale_table= av_mallocz( p->qstride * a->mb_height);
247
248 return 0;
249}
250
251static int decode_end(AVCodecContext *avctx){
252 MDECContext * const a = avctx->priv_data;
253
254 av_freep(&a->bitstream_buffer);
255 av_freep(&a->picture.qscale_table);
256 a->bitstream_buffer_size=0;
257
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258 return 0;
259}
260
261AVCodec mdec_decoder = {
262 "mdec",
263 CODEC_TYPE_VIDEO,
264 CODEC_ID_MDEC,
265 sizeof(MDECContext),
266 decode_init,
267 NULL,
268 decode_end,
269 decode_frame,
270 CODEC_CAP_DR1,
271};
272