a3adde9356dbedd908376bf90ed8dc944684e152
[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 "internal.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 {
50 static int done = 0;
51
52 if (!done) {
53 done = 1;
54
55 INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
56 &ff_asv_ccp_tab[0][1], 2, 1,
57 &ff_asv_ccp_tab[0][0], 2, 1, 64);
58 INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
59 &ff_asv_dc_ccp_tab[0][1], 2, 1,
60 &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
61 INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
62 &ff_asv_ac_ccp_tab[0][1], 2, 1,
63 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
64 INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
65 &ff_asv_level_tab[0][1], 2, 1,
66 &ff_asv_level_tab[0][0], 2, 1, 64);
67 INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
68 &ff_asv2_level_tab[0][1], 2, 1,
69 &ff_asv2_level_tab[0][0], 2, 1, 1024);
70 }
71 }
72
73 //FIXME write a reversed bitstream reader to avoid the double reverse
74 static inline int asv2_get_bits(GetBitContext *gb, int n)
75 {
76 return ff_reverse[get_bits(gb, n) << (8-n)];
77 }
78
79 static inline int asv1_get_level(GetBitContext *gb)
80 {
81 int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
82
83 if (code == 3)
84 return get_sbits(gb, 8);
85 else
86 return code - 3;
87 }
88
89 static inline int asv2_get_level(GetBitContext *gb)
90 {
91 int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
92
93 if (code == 31)
94 return (int8_t)asv2_get_bits(gb, 8);
95 else
96 return code - 31;
97 }
98
99 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
100 {
101 int i;
102
103 block[0] = 8 * get_bits(&a->gb, 8);
104
105 for (i = 0; i < 11; i++) {
106 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
107
108 if (ccp) {
109 if (ccp == 16)
110 break;
111 if (ccp < 0 || i >= 10) {
112 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
113 return AVERROR_INVALIDDATA;
114 }
115
116 if (ccp & 8)
117 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
118 if (ccp & 4)
119 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
120 if (ccp & 2)
121 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
122 if (ccp & 1)
123 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
124 }
125 }
126
127 return 0;
128 }
129
130 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
131 {
132 int i, count, ccp;
133
134 count = asv2_get_bits(&a->gb, 4);
135
136 block[0] = 8 * asv2_get_bits(&a->gb, 8);
137
138 ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
139 if (ccp) {
140 if (ccp & 4)
141 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
142 if (ccp & 2)
143 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
144 if (ccp & 1)
145 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
146 }
147
148 for (i = 1; i < count + 1; i++) {
149 const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
150
151 if (ccp) {
152 if (ccp & 8)
153 block[a->scantable.permutated[4*i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 0]) >> 4;
154 if (ccp & 4)
155 block[a->scantable.permutated[4*i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 1]) >> 4;
156 if (ccp & 2)
157 block[a->scantable.permutated[4*i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 2]) >> 4;
158 if (ccp & 1)
159 block[a->scantable.permutated[4*i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 3]) >> 4;
160 }
161 }
162
163 return 0;
164 }
165
166 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
167 {
168 int i;
169
170 a->dsp.clear_blocks(block[0]);
171
172 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
173 for (i = 0; i < 6; i++) {
174 if (asv1_decode_block(a, block[i]) < 0)
175 return -1;
176 }
177 } else {
178 for (i = 0; i < 6; i++) {
179 if (asv2_decode_block(a, block[i]) < 0)
180 return -1;
181 }
182 }
183 return 0;
184 }
185
186 static inline void idct_put(ASV1Context *a, int mb_x, int mb_y)
187 {
188 int16_t (*block)[64] = a->block;
189 int linesize = a->picture.linesize[0];
190
191 uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
192 uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
193 uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
194
195 a->dsp.idct_put(dest_y , linesize, block[0]);
196 a->dsp.idct_put(dest_y + 8, linesize, block[1]);
197 a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
198 a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
199
200 if (!(a->avctx->flags&CODEC_FLAG_GRAY)) {
201 a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
202 a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
203 }
204 }
205
206 static int decode_frame(AVCodecContext *avctx,
207 void *data, int *got_frame,
208 AVPacket *avpkt)
209 {
210 ASV1Context * const a = avctx->priv_data;
211 const uint8_t *buf = avpkt->data;
212 int buf_size = avpkt->size;
213 AVFrame *picture = data;
214 AVFrame * const p = &a->picture;
215 int mb_x, mb_y, ret;
216
217 if (p->data[0])
218 avctx->release_buffer(avctx, p);
219
220 p->reference = 0;
221 if ((ret = ff_get_buffer(avctx, p)) < 0) {
222 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
223 return ret;
224 }
225 p->pict_type = AV_PICTURE_TYPE_I;
226 p->key_frame = 1;
227
228 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
229 buf_size);
230 if (!a->bitstream_buffer)
231 return AVERROR(ENOMEM);
232
233 if (avctx->codec_id == AV_CODEC_ID_ASV1)
234 a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
235 else {
236 int i;
237 for (i = 0; i < buf_size; i++)
238 a->bitstream_buffer[i] = ff_reverse[buf[i]];
239 }
240
241 init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
242
243 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
244 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
245 if ((ret = decode_mb(a, a->block)) < 0)
246 return ret;
247
248 idct_put(a, mb_x, mb_y);
249 }
250 }
251
252 if (a->mb_width2 != a->mb_width) {
253 mb_x = a->mb_width2;
254 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
255 if ((ret = decode_mb(a, a->block)) < 0)
256 return ret;
257
258 idct_put(a, mb_x, mb_y);
259 }
260 }
261
262 if (a->mb_height2 != a->mb_height) {
263 mb_y = a->mb_height2;
264 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
265 if ((ret = decode_mb(a, a->block)) < 0)
266 return ret;
267
268 idct_put(a, mb_x, mb_y);
269 }
270 }
271
272 *picture = a->picture;
273 *got_frame = 1;
274
275 emms_c();
276
277 return (get_bits_count(&a->gb) + 31) / 32 * 4;
278 }
279
280 static av_cold int decode_init(AVCodecContext *avctx)
281 {
282 ASV1Context * const a = avctx->priv_data;
283 AVFrame *p = &a->picture;
284 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
285 int i;
286
287 ff_asv_common_init(avctx);
288 init_vlcs(a);
289 ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_asv_scantab);
290 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
291
292 a->inv_qscale = avctx->extradata[0];
293 if (a->inv_qscale == 0) {
294 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
295 if (avctx->codec_id == AV_CODEC_ID_ASV1)
296 a->inv_qscale = 6;
297 else
298 a->inv_qscale = 10;
299 }
300
301 for (i = 0; i < 64; i++) {
302 int index = ff_asv_scantab[i];
303
304 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
305 }
306
307 p->qstride = a->mb_width;
308 p->qscale_table = av_malloc(p->qstride * a->mb_height);
309 p->quality = (32 * scale + a->inv_qscale / 2) / a->inv_qscale;
310 memset(p->qscale_table, p->quality, p->qstride * a->mb_height);
311
312 return 0;
313 }
314
315 static av_cold int decode_end(AVCodecContext *avctx)
316 {
317 ASV1Context * const a = avctx->priv_data;
318
319 av_freep(&a->bitstream_buffer);
320 av_freep(&a->picture.qscale_table);
321 a->bitstream_buffer_size = 0;
322
323 if (a->picture.data[0])
324 avctx->release_buffer(avctx, &a->picture);
325
326 return 0;
327 }
328
329 AVCodec ff_asv1_decoder = {
330 .name = "asv1",
331 .type = AVMEDIA_TYPE_VIDEO,
332 .id = AV_CODEC_ID_ASV1,
333 .priv_data_size = sizeof(ASV1Context),
334 .init = decode_init,
335 .close = decode_end,
336 .decode = decode_frame,
337 .capabilities = CODEC_CAP_DR1,
338 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
339 };
340
341 AVCodec ff_asv2_decoder = {
342 .name = "asv2",
343 .type = AVMEDIA_TYPE_VIDEO,
344 .id = AV_CODEC_ID_ASV2,
345 .priv_data_size = sizeof(ASV1Context),
346 .init = decode_init,
347 .close = decode_end,
348 .decode = decode_frame,
349 .capabilities = CODEC_CAP_DR1,
350 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
351 };
352