Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / asvdec.c
1 /*
2 * Copyright (c) 2003 Michael Niedermayer
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "blockdsp.h"
32 #include "idctdsp.h"
33 #include "internal.h"
34 #include "mathops.h"
35 #include "mpeg12data.h"
36
37 #define VLC_BITS 6
38 #define ASV2_LEVEL_VLC_BITS 10
39
40 static VLC ccp_vlc;
41 static VLC level_vlc;
42 static VLC dc_ccp_vlc;
43 static VLC ac_ccp_vlc;
44 static VLC asv2_level_vlc;
45
46 static av_cold void init_vlcs(ASV1Context *a)
47 {
48 static int done = 0;
49
50 if (!done) {
51 done = 1;
52
53 INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
54 &ff_asv_ccp_tab[0][1], 2, 1,
55 &ff_asv_ccp_tab[0][0], 2, 1, 64);
56 INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
57 &ff_asv_dc_ccp_tab[0][1], 2, 1,
58 &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
59 INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
60 &ff_asv_ac_ccp_tab[0][1], 2, 1,
61 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
62 INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
63 &ff_asv_level_tab[0][1], 2, 1,
64 &ff_asv_level_tab[0][0], 2, 1, 64);
65 INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
66 &ff_asv2_level_tab[0][1], 2, 1,
67 &ff_asv2_level_tab[0][0], 2, 1, 1024);
68 }
69 }
70
71 // FIXME write a reversed bitstream reader to avoid the double reverse
72 static inline int asv2_get_bits(GetBitContext *gb, int n)
73 {
74 return ff_reverse[get_bits(gb, n) << (8 - n)];
75 }
76
77 static inline int asv1_get_level(GetBitContext *gb)
78 {
79 int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
80
81 if (code == 3)
82 return get_sbits(gb, 8);
83 else
84 return code - 3;
85 }
86
87 static inline int asv2_get_level(GetBitContext *gb)
88 {
89 int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
90
91 if (code == 31)
92 return (int8_t) asv2_get_bits(gb, 8);
93 else
94 return code - 31;
95 }
96
97 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
98 {
99 int i;
100
101 block[0] = 8 * get_bits(&a->gb, 8);
102
103 for (i = 0; i < 11; i++) {
104 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
105
106 if (ccp) {
107 if (ccp == 16)
108 break;
109 if (ccp < 0 || i >= 10) {
110 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
111 return AVERROR_INVALIDDATA;
112 }
113
114 if (ccp & 8)
115 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
116 if (ccp & 4)
117 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
118 if (ccp & 2)
119 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
120 if (ccp & 1)
121 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
122 }
123 }
124
125 return 0;
126 }
127
128 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
129 {
130 int i, count, ccp;
131
132 count = asv2_get_bits(&a->gb, 4);
133
134 block[0] = 8 * asv2_get_bits(&a->gb, 8);
135
136 ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
137 if (ccp) {
138 if (ccp & 4)
139 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
140 if (ccp & 2)
141 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
142 if (ccp & 1)
143 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
144 }
145
146 for (i = 1; i < count + 1; i++) {
147 const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
148
149 if (ccp) {
150 if (ccp & 8)
151 block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
152 if (ccp & 4)
153 block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
154 if (ccp & 2)
155 block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
156 if (ccp & 1)
157 block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
158 }
159 }
160
161 return 0;
162 }
163
164 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
165 {
166 int i;
167
168 a->bdsp.clear_blocks(block[0]);
169
170 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
171 for (i = 0; i < 6; i++) {
172 if (asv1_decode_block(a, block[i]) < 0)
173 return -1;
174 }
175 } else {
176 for (i = 0; i < 6; i++) {
177 if (asv2_decode_block(a, block[i]) < 0)
178 return -1;
179 }
180 }
181 return 0;
182 }
183
184 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
185 {
186 int16_t(*block)[64] = a->block;
187 int linesize = frame->linesize[0];
188
189 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
190 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
191 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
192
193 a->idsp.idct_put(dest_y, linesize, block[0]);
194 a->idsp.idct_put(dest_y + 8, linesize, block[1]);
195 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
196 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
197
198 if (!(a->avctx->flags & CODEC_FLAG_GRAY)) {
199 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
200 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
201 }
202 }
203
204 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
205 AVPacket *avpkt)
206 {
207 ASV1Context *const a = avctx->priv_data;
208 const uint8_t *buf = avpkt->data;
209 int buf_size = avpkt->size;
210 AVFrame *const p = data;
211 int mb_x, mb_y, ret;
212
213 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
214 return ret;
215 p->pict_type = AV_PICTURE_TYPE_I;
216 p->key_frame = 1;
217
218 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
219 buf_size);
220 if (!a->bitstream_buffer)
221 return AVERROR(ENOMEM);
222
223 if (avctx->codec_id == AV_CODEC_ID_ASV1) {
224 a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
225 (const uint32_t *) buf, buf_size / 4);
226 } else {
227 int i;
228 for (i = 0; i < buf_size; i++)
229 a->bitstream_buffer[i] = ff_reverse[buf[i]];
230 }
231
232 init_get_bits(&a->gb, a->bitstream_buffer, buf_size * 8);
233
234 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
235 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
236 if ((ret = decode_mb(a, a->block)) < 0)
237 return ret;
238
239 idct_put(a, p, mb_x, mb_y);
240 }
241 }
242
243 if (a->mb_width2 != a->mb_width) {
244 mb_x = a->mb_width2;
245 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
246 if ((ret = decode_mb(a, a->block)) < 0)
247 return ret;
248
249 idct_put(a, p, mb_x, mb_y);
250 }
251 }
252
253 if (a->mb_height2 != a->mb_height) {
254 mb_y = a->mb_height2;
255 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
256 if ((ret = decode_mb(a, a->block)) < 0)
257 return ret;
258
259 idct_put(a, p, mb_x, mb_y);
260 }
261 }
262
263 *got_frame = 1;
264
265 emms_c();
266
267 return (get_bits_count(&a->gb) + 31) / 32 * 4;
268 }
269
270 static av_cold int decode_init(AVCodecContext *avctx)
271 {
272 ASV1Context *const a = avctx->priv_data;
273 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
274 int i;
275
276 if (avctx->extradata_size < 1) {
277 av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
278 }
279
280 ff_asv_common_init(avctx);
281 ff_blockdsp_init(&a->bdsp, avctx);
282 ff_idctdsp_init(&a->idsp, avctx);
283 init_vlcs(a);
284 ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);
285 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
286
287 if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
288 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
289 if (avctx->codec_id == AV_CODEC_ID_ASV1)
290 a->inv_qscale = 6;
291 else
292 a->inv_qscale = 10;
293 }
294
295 for (i = 0; i < 64; i++) {
296 int index = ff_asv_scantab[i];
297
298 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
299 a->inv_qscale;
300 }
301
302 return 0;
303 }
304
305 static av_cold int decode_end(AVCodecContext *avctx)
306 {
307 ASV1Context *const a = avctx->priv_data;
308
309 av_freep(&a->bitstream_buffer);
310 a->bitstream_buffer_size = 0;
311
312 return 0;
313 }
314
315 #if CONFIG_ASV1_DECODER
316 AVCodec ff_asv1_decoder = {
317 .name = "asv1",
318 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
319 .type = AVMEDIA_TYPE_VIDEO,
320 .id = AV_CODEC_ID_ASV1,
321 .priv_data_size = sizeof(ASV1Context),
322 .init = decode_init,
323 .close = decode_end,
324 .decode = decode_frame,
325 .capabilities = CODEC_CAP_DR1,
326 };
327 #endif
328
329 #if CONFIG_ASV2_DECODER
330 AVCodec ff_asv2_decoder = {
331 .name = "asv2",
332 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
333 .type = AVMEDIA_TYPE_VIDEO,
334 .id = AV_CODEC_ID_ASV2,
335 .priv_data_size = sizeof(ASV1Context),
336 .init = decode_init,
337 .close = decode_end,
338 .decode = decode_frame,
339 .capabilities = CODEC_CAP_DR1,
340 };
341 #endif