blob: 603a09253b03e728e5ca9043d3ff41396ac2458e
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, ret; |
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 ((ret = asv1_decode_block(a, block[i])) < 0) |
173 | return ret; |
174 | } |
175 | } else { |
176 | for (i = 0; i < 6; i++) { |
177 | if ((ret = asv2_decode_block(a, block[i])) < 0) |
178 | return ret; |
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 & AV_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 = AV_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 = AV_CODEC_CAP_DR1, |
340 | }; |
341 | #endif |
342 |