a546d240200bad87fad5bb31afc2609557d3129e
[libav.git] / libavcodec / asvdec.c
1 /*
2 * Copyright (c) 2003 Michael Niedermayer
3 *
4 * This file is part of Libav.
5 *
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * ASUS V1/V2 decoder.
24 */
25
26 #include "libavutil/attributes.h"
27 #include "libavutil/mem.h"
28
29 #include "asv.h"
30 #include "avcodec.h"
31 #include "put_bits.h"
32 #include "dsputil.h"
33 #include "mathops.h"
34 #include "mpeg12data.h"
35
36 //#undef NDEBUG
37 //#include <assert.h>
38
39 #define VLC_BITS 6
40 #define ASV2_LEVEL_VLC_BITS 10
41
42 static VLC ccp_vlc;
43 static VLC level_vlc;
44 static VLC dc_ccp_vlc;
45 static VLC ac_ccp_vlc;
46 static VLC asv2_level_vlc;
47
48 static av_cold void init_vlcs(ASV1Context *a){
49 static int done = 0;
50
51 if (!done) {
52 done = 1;
53
54 INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
55 &ff_asv_ccp_tab[0][1], 2, 1,
56 &ff_asv_ccp_tab[0][0], 2, 1, 64);
57 INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
58 &ff_asv_dc_ccp_tab[0][1], 2, 1,
59 &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
60 INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
61 &ff_asv_ac_ccp_tab[0][1], 2, 1,
62 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
63 INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
64 &ff_asv_level_tab[0][1], 2, 1,
65 &ff_asv_level_tab[0][0], 2, 1, 64);
66 INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
67 &ff_asv2_level_tab[0][1], 2, 1,
68 &ff_asv2_level_tab[0][0], 2, 1, 1024);
69 }
70 }
71
72 //FIXME write a reversed bitstream reader to avoid the double reverse
73 static inline int asv2_get_bits(GetBitContext *gb, int n){
74 return ff_reverse[ get_bits(gb, n) << (8-n) ];
75 }
76
77 static inline int asv1_get_level(GetBitContext *gb){
78 int code= get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
79
80 if(code==3) return get_sbits(gb, 8);
81 else return code - 3;
82 }
83
84 static inline int asv2_get_level(GetBitContext *gb){
85 int code= get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
86
87 if(code==31) return (int8_t)asv2_get_bits(gb, 8);
88 else return code - 31;
89 }
90
91 static inline int asv1_decode_block(ASV1Context *a, DCTELEM block[64]){
92 int i;
93
94 block[0]= 8*get_bits(&a->gb, 8);
95
96 for(i=0; i<11; i++){
97 const int ccp= get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
98
99 if(ccp){
100 if(ccp == 16) break;
101 if(ccp < 0 || i>=10){
102 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
103 return -1;
104 }
105
106 if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
107 if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
108 if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
109 if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
110 }
111 }
112
113 return 0;
114 }
115
116 static inline int asv2_decode_block(ASV1Context *a, DCTELEM block[64]){
117 int i, count, ccp;
118
119 count= asv2_get_bits(&a->gb, 4);
120
121 block[0]= 8*asv2_get_bits(&a->gb, 8);
122
123 ccp= get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
124 if(ccp){
125 if(ccp&4) block[a->scantable.permutated[1]]= (asv2_get_level(&a->gb) * a->intra_matrix[1])>>4;
126 if(ccp&2) block[a->scantable.permutated[2]]= (asv2_get_level(&a->gb) * a->intra_matrix[2])>>4;
127 if(ccp&1) block[a->scantable.permutated[3]]= (asv2_get_level(&a->gb) * a->intra_matrix[3])>>4;
128 }
129
130 for(i=1; i<count+1; i++){
131 const int ccp= get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
132
133 if(ccp){
134 if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
135 if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
136 if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
137 if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
138 }
139 }
140
141 return 0;
142 }
143
144 static inline int decode_mb(ASV1Context *a, DCTELEM block[6][64]){
145 int i;
146
147 a->dsp.clear_blocks(block[0]);
148
149 if(a->avctx->codec_id == AV_CODEC_ID_ASV1){
150 for(i=0; i<6; i++){
151 if( asv1_decode_block(a, block[i]) < 0)
152 return -1;
153 }
154 }else{
155 for(i=0; i<6; i++){
156 if( asv2_decode_block(a, block[i]) < 0)
157 return -1;
158 }
159 }
160 return 0;
161 }
162
163 static inline void idct_put(ASV1Context *a, int mb_x, int mb_y){
164 DCTELEM (*block)[64]= a->block;
165 int linesize= a->picture.linesize[0];
166
167 uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
168 uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
169 uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
170
171 a->dsp.idct_put(dest_y , linesize, block[0]);
172 a->dsp.idct_put(dest_y + 8, linesize, block[1]);
173 a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
174 a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
175
176 if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
177 a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
178 a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
179 }
180 }
181
182 static int decode_frame(AVCodecContext *avctx,
183 void *data, int *data_size,
184 AVPacket *avpkt)
185 {
186 const uint8_t *buf = avpkt->data;
187 int buf_size = avpkt->size;
188 ASV1Context * const a = avctx->priv_data;
189 AVFrame *picture = data;
190 AVFrame * const p= &a->picture;
191 int mb_x, mb_y;
192
193 if(p->data[0])
194 avctx->release_buffer(avctx, p);
195
196 p->reference= 0;
197 if(avctx->get_buffer(avctx, p) < 0){
198 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
199 return -1;
200 }
201 p->pict_type= AV_PICTURE_TYPE_I;
202 p->key_frame= 1;
203
204 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
205 buf_size);
206 if (!a->bitstream_buffer)
207 return AVERROR(ENOMEM);
208
209 if(avctx->codec_id == AV_CODEC_ID_ASV1)
210 a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
211 else{
212 int i;
213 for(i=0; i<buf_size; i++)
214 a->bitstream_buffer[i]= ff_reverse[ buf[i] ];
215 }
216
217 init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
218
219 for(mb_y=0; mb_y<a->mb_height2; mb_y++){
220 for(mb_x=0; mb_x<a->mb_width2; mb_x++){
221 if( decode_mb(a, a->block) <0)
222 return -1;
223
224 idct_put(a, mb_x, mb_y);
225 }
226 }
227
228 if(a->mb_width2 != a->mb_width){
229 mb_x= a->mb_width2;
230 for(mb_y=0; mb_y<a->mb_height2; mb_y++){
231 if( decode_mb(a, a->block) <0)
232 return -1;
233
234 idct_put(a, mb_x, mb_y);
235 }
236 }
237
238 if(a->mb_height2 != a->mb_height){
239 mb_y= a->mb_height2;
240 for(mb_x=0; mb_x<a->mb_width; mb_x++){
241 if( decode_mb(a, a->block) <0)
242 return -1;
243
244 idct_put(a, mb_x, mb_y);
245 }
246 }
247
248 *picture = a->picture;
249 *data_size = sizeof(AVPicture);
250
251 emms_c();
252
253 return (get_bits_count(&a->gb)+31)/32*4;
254 }
255
256 static av_cold int decode_init(AVCodecContext *avctx){
257 ASV1Context * const a = avctx->priv_data;
258 AVFrame *p= &a->picture;
259 int i;
260 const int scale= avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
261
262 ff_asv_common_init(avctx);
263 init_vlcs(a);
264 ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_asv_scantab);
265 avctx->pix_fmt= AV_PIX_FMT_YUV420P;
266
267 a->inv_qscale= avctx->extradata[0];
268 if(a->inv_qscale == 0){
269 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
270 if(avctx->codec_id == AV_CODEC_ID_ASV1)
271 a->inv_qscale= 6;
272 else
273 a->inv_qscale= 10;
274 }
275
276 for(i=0; i<64; i++){
277 int index = ff_asv_scantab[i];
278
279 a->intra_matrix[i]= 64*scale*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
280 }
281
282 p->qstride= a->mb_width;
283 p->qscale_table= av_malloc( p->qstride * a->mb_height);
284 p->quality= (32*scale + a->inv_qscale/2)/a->inv_qscale;
285 memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
286
287 return 0;
288 }
289
290 static av_cold int decode_end(AVCodecContext *avctx){
291 ASV1Context * const a = avctx->priv_data;
292
293 av_freep(&a->bitstream_buffer);
294 av_freep(&a->picture.qscale_table);
295 a->bitstream_buffer_size=0;
296
297 if(a->picture.data[0])
298 avctx->release_buffer(avctx, &a->picture);
299
300 return 0;
301 }
302
303 AVCodec ff_asv1_decoder = {
304 .name = "asv1",
305 .type = AVMEDIA_TYPE_VIDEO,
306 .id = AV_CODEC_ID_ASV1,
307 .priv_data_size = sizeof(ASV1Context),
308 .init = decode_init,
309 .close = decode_end,
310 .decode = decode_frame,
311 .capabilities = CODEC_CAP_DR1,
312 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
313 };
314
315 AVCodec ff_asv2_decoder = {
316 .name = "asv2",
317 .type = AVMEDIA_TYPE_VIDEO,
318 .id = AV_CODEC_ID_ASV2,
319 .priv_data_size = sizeof(ASV1Context),
320 .init = decode_init,
321 .close = decode_end,
322 .decode = decode_frame,
323 .capabilities = CODEC_CAP_DR1,
324 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
325 };
326