cosmetics: Align codec declarations
[libav.git] / libavcodec / eamad.c
1 /*
2 * Electronic Arts Madcow Video Decoder
3 * Copyright (c) 2007-2009 Peter Ross
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Electronic Arts Madcow Video Decoder
25 * @author Peter Ross <pross@xvid.org>
26 *
27 * @see technical details at
28 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_MAD
29 */
30
31 #include "avcodec.h"
32 #include "get_bits.h"
33 #include "dsputil.h"
34 #include "aandcttab.h"
35 #include "mpeg12.h"
36 #include "mpeg12data.h"
37 #include "libavutil/imgutils.h"
38
39 #define EA_PREAMBLE_SIZE 8
40 #define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD i-frame */
41 #define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD p-frame */
42 #define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
43
44 typedef struct MadContext {
45 MpegEncContext s;
46 AVFrame frame;
47 AVFrame last_frame;
48 void *bitstream_buf;
49 unsigned int bitstream_buf_size;
50 DECLARE_ALIGNED(16, DCTELEM, block)[64];
51 } MadContext;
52
53 static void bswap16_buf(uint16_t *dst, const uint16_t *src, int count)
54 {
55 int i;
56 for (i=0; i<count; i++)
57 dst[i] = av_bswap16(src[i]);
58 }
59
60 static av_cold int decode_init(AVCodecContext *avctx)
61 {
62 MadContext *t = avctx->priv_data;
63 MpegEncContext *s = &t->s;
64 s->avctx = avctx;
65 avctx->pix_fmt = PIX_FMT_YUV420P;
66 if (avctx->idct_algo == FF_IDCT_AUTO)
67 avctx->idct_algo = FF_IDCT_EA;
68 ff_dsputil_init(&s->dsp, avctx);
69 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
70 ff_mpeg12_init_vlcs();
71 return 0;
72 }
73
74 static inline void comp(unsigned char *dst, int dst_stride,
75 unsigned char *src, int src_stride, int add)
76 {
77 int j, i;
78 for (j=0; j<8; j++)
79 for (i=0; i<8; i++)
80 dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
81 }
82
83 static inline void comp_block(MadContext *t, int mb_x, int mb_y,
84 int j, int mv_x, int mv_y, int add)
85 {
86 MpegEncContext *s = &t->s;
87 if (j < 4) {
88 comp(t->frame.data[0] + (mb_y*16 + ((j&2)<<2))*t->frame.linesize[0] + mb_x*16 + ((j&1)<<3),
89 t->frame.linesize[0],
90 t->last_frame.data[0] + (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame.linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x,
91 t->last_frame.linesize[0], add);
92 } else if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
93 int index = j - 3;
94 comp(t->frame.data[index] + (mb_y*8)*t->frame.linesize[index] + mb_x * 8,
95 t->frame.linesize[index],
96 t->last_frame.data[index] + (mb_y * 8 + (mv_y/2))*t->last_frame.linesize[index] + mb_x * 8 + (mv_x/2),
97 t->last_frame.linesize[index], add);
98 }
99 }
100
101 static inline void idct_put(MadContext *t, DCTELEM *block, int mb_x, int mb_y, int j)
102 {
103 MpegEncContext *s = &t->s;
104 if (j < 4) {
105 s->dsp.idct_put(
106 t->frame.data[0] + (mb_y*16 + ((j&2)<<2))*t->frame.linesize[0] + mb_x*16 + ((j&1)<<3),
107 t->frame.linesize[0], block);
108 } else if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
109 int index = j - 3;
110 s->dsp.idct_put(
111 t->frame.data[index] + (mb_y*8)*t->frame.linesize[index] + mb_x*8,
112 t->frame.linesize[index], block);
113 }
114 }
115
116 static inline void decode_block_intra(MadContext * t, DCTELEM * block)
117 {
118 MpegEncContext *s = &t->s;
119 int level, i, j, run;
120 RLTable *rl = &ff_rl_mpeg1;
121 const uint8_t *scantable = s->intra_scantable.permutated;
122 int16_t *quant_matrix = s->intra_matrix;
123
124 block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
125
126 /* The RL decoder is derived from mpeg1_decode_block_intra;
127 Escaped level and run values a decoded differently */
128 i = 0;
129 {
130 OPEN_READER(re, &s->gb);
131 /* now quantify & encode AC coefficients */
132 for (;;) {
133 UPDATE_CACHE(re, &s->gb);
134 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
135
136 if (level == 127) {
137 break;
138 } else if (level != 0) {
139 i += run;
140 j = scantable[i];
141 level = (level*quant_matrix[j]) >> 4;
142 level = (level-1)|1;
143 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
144 LAST_SKIP_BITS(re, &s->gb, 1);
145 } else {
146 /* escape */
147 UPDATE_CACHE(re, &s->gb);
148 level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
149
150 UPDATE_CACHE(re, &s->gb);
151 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
152
153 i += run;
154 j = scantable[i];
155 if (level < 0) {
156 level = -level;
157 level = (level*quant_matrix[j]) >> 4;
158 level = (level-1)|1;
159 level = -level;
160 } else {
161 level = (level*quant_matrix[j]) >> 4;
162 level = (level-1)|1;
163 }
164 }
165 if (i > 63) {
166 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
167 return;
168 }
169
170 block[j] = level;
171 }
172 CLOSE_READER(re, &s->gb);
173 }
174 }
175
176 static int decode_motion(GetBitContext *gb)
177 {
178 int value = 0;
179 if (get_bits1(gb)) {
180 if (get_bits1(gb))
181 value = -17;
182 value += get_bits(gb, 4) + 1;
183 }
184 return value;
185 }
186
187 static void decode_mb(MadContext *t, int inter)
188 {
189 MpegEncContext *s = &t->s;
190 int mv_map = 0;
191 int mv_x, mv_y;
192 int j;
193
194 if (inter) {
195 int v = decode210(&s->gb);
196 if (v < 2) {
197 mv_map = v ? get_bits(&s->gb, 6) : 63;
198 mv_x = decode_motion(&s->gb);
199 mv_y = decode_motion(&s->gb);
200 } else {
201 mv_map = 0;
202 }
203 }
204
205 for (j=0; j<6; j++) {
206 if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
207 int add = 2*decode_motion(&s->gb);
208 comp_block(t, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
209 } else {
210 s->dsp.clear_block(t->block);
211 decode_block_intra(t, t->block);
212 idct_put(t, t->block, s->mb_x, s->mb_y, j);
213 }
214 }
215 }
216
217 static void calc_intra_matrix(MadContext *t, int qscale)
218 {
219 MpegEncContext *s = &t->s;
220 int i;
221
222 if (s->avctx->idct_algo == FF_IDCT_EA) {
223 s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
224 for (i=1; i<64; i++)
225 s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
226 } else {
227 s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
228 for (i=1; i<64; i++)
229 s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale) << 1;
230 }
231 }
232
233 static int decode_frame(AVCodecContext *avctx,
234 void *data, int *data_size,
235 AVPacket *avpkt)
236 {
237 const uint8_t *buf = avpkt->data;
238 int buf_size = avpkt->size;
239 const uint8_t *buf_end = buf+buf_size;
240 MadContext *t = avctx->priv_data;
241 MpegEncContext *s = &t->s;
242 int chunk_type;
243 int inter;
244
245 if (buf_size < 17) {
246 av_log(avctx, AV_LOG_ERROR, "Input buffer too small\n");
247 *data_size = 0;
248 return -1;
249 }
250
251 chunk_type = AV_RL32(&buf[0]);
252 inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
253 buf += 8;
254
255 av_reduce(&avctx->time_base.num, &avctx->time_base.den,
256 AV_RL16(&buf[6]), 1000, 1<<30);
257
258 s->width = AV_RL16(&buf[8]);
259 s->height = AV_RL16(&buf[10]);
260 calc_intra_matrix(t, buf[13]);
261 buf += 16;
262
263 if (avctx->width != s->width || avctx->height != s->height) {
264 if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
265 return -1;
266 avcodec_set_dimensions(avctx, s->width, s->height);
267 if (t->frame.data[0])
268 avctx->release_buffer(avctx, &t->frame);
269 }
270
271 t->frame.reference = 1;
272 if (!t->frame.data[0]) {
273 if (avctx->get_buffer(avctx, &t->frame) < 0) {
274 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
275 return -1;
276 }
277 }
278
279 av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
280 if (!t->bitstream_buf)
281 return AVERROR(ENOMEM);
282 bswap16_buf(t->bitstream_buf, (const uint16_t*)buf, (buf_end-buf)/2);
283 init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
284
285 for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
286 for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
287 decode_mb(t, inter);
288
289 *data_size = sizeof(AVFrame);
290 *(AVFrame*)data = t->frame;
291
292 if (chunk_type != MADe_TAG)
293 FFSWAP(AVFrame, t->frame, t->last_frame);
294
295 return buf_size;
296 }
297
298 static av_cold int decode_end(AVCodecContext *avctx)
299 {
300 MadContext *t = avctx->priv_data;
301 if (t->frame.data[0])
302 avctx->release_buffer(avctx, &t->frame);
303 if (t->last_frame.data[0])
304 avctx->release_buffer(avctx, &t->last_frame);
305 av_free(t->bitstream_buf);
306 return 0;
307 }
308
309 AVCodec ff_eamad_decoder = {
310 .name = "eamad",
311 .type = AVMEDIA_TYPE_VIDEO,
312 .id = CODEC_ID_MAD,
313 .priv_data_size = sizeof(MadContext),
314 .init = decode_init,
315 .close = decode_end,
316 .decode = decode_frame,
317 .capabilities = CODEC_CAP_DR1,
318 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video")
319 };