Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / eamad.c
1 /*
2 * Electronic Arts Madcow Video Decoder
3 * Copyright (c) 2007-2009 Peter Ross
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "bytestream.h"
33 #include "bswapdsp.h"
34 #include "get_bits.h"
35 #include "aandcttab.h"
36 #include "eaidct.h"
37 #include "idctdsp.h"
38 #include "internal.h"
39 #include "mpeg12.h"
40 #include "mpeg12data.h"
41 #include "libavutil/imgutils.h"
42
43 #define EA_PREAMBLE_SIZE 8
44 #define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD i-frame */
45 #define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD p-frame */
46 #define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
47
48 typedef struct MadContext {
49 AVCodecContext *avctx;
50 BlockDSPContext bdsp;
51 BswapDSPContext bbdsp;
52 IDCTDSPContext idsp;
53 AVFrame *last_frame;
54 GetBitContext gb;
55 void *bitstream_buf;
56 unsigned int bitstream_buf_size;
57 DECLARE_ALIGNED(16, int16_t, block)[64];
58 ScanTable scantable;
59 uint16_t quant_matrix[64];
60 int mb_x;
61 int mb_y;
62 } MadContext;
63
64 static av_cold int decode_init(AVCodecContext *avctx)
65 {
66 MadContext *s = avctx->priv_data;
67 s->avctx = avctx;
68 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
69 ff_blockdsp_init(&s->bdsp, avctx);
70 ff_bswapdsp_init(&s->bbdsp);
71 ff_idctdsp_init(&s->idsp, avctx);
72 ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE);
73 ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct);
74 ff_mpeg12_init_vlcs();
75
76 s->last_frame = av_frame_alloc();
77 if (!s->last_frame)
78 return AVERROR(ENOMEM);
79
80 return 0;
81 }
82
83 static inline void comp(unsigned char *dst, int dst_stride,
84 unsigned char *src, int src_stride, int add)
85 {
86 int j, i;
87 for (j=0; j<8; j++)
88 for (i=0; i<8; i++)
89 dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
90 }
91
92 static inline void comp_block(MadContext *t, AVFrame *frame,
93 int mb_x, int mb_y,
94 int j, int mv_x, int mv_y, int add)
95 {
96 if (j < 4) {
97 unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x;
98 if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7)
99 return;
100 comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
101 frame->linesize[0],
102 t->last_frame->data[0] + offset,
103 t->last_frame->linesize[0], add);
104 } else if (!(t->avctx->flags & CODEC_FLAG_GRAY)) {
105 int index = j - 3;
106 unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2);
107 if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7)
108 return;
109 comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
110 frame->linesize[index],
111 t->last_frame->data[index] + offset,
112 t->last_frame->linesize[index], add);
113 }
114 }
115
116 static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
117 int mb_x, int mb_y, int j)
118 {
119 if (j < 4) {
120 ff_ea_idct_put_c(
121 frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
122 frame->linesize[0], block);
123 } else if (!(t->avctx->flags & CODEC_FLAG_GRAY)) {
124 int index = j - 3;
125 ff_ea_idct_put_c(
126 frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
127 frame->linesize[index], block);
128 }
129 }
130
131 static inline int decode_block_intra(MadContext *s, int16_t * block)
132 {
133 int level, i, j, run;
134 RLTable *rl = &ff_rl_mpeg1;
135 const uint8_t *scantable = s->scantable.permutated;
136 int16_t *quant_matrix = s->quant_matrix;
137
138 block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
139
140 /* The RL decoder is derived from mpeg1_decode_block_intra;
141 Escaped level and run values a decoded differently */
142 i = 0;
143 {
144 OPEN_READER(re, &s->gb);
145 /* now quantify & encode AC coefficients */
146 for (;;) {
147 UPDATE_CACHE(re, &s->gb);
148 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
149
150 if (level == 127) {
151 break;
152 } else if (level != 0) {
153 i += run;
154 j = scantable[i];
155 level = (level*quant_matrix[j]) >> 4;
156 level = (level-1)|1;
157 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
158 LAST_SKIP_BITS(re, &s->gb, 1);
159 } else {
160 /* escape */
161 UPDATE_CACHE(re, &s->gb);
162 level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
163
164 UPDATE_CACHE(re, &s->gb);
165 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
166
167 i += run;
168 j = scantable[i];
169 if (level < 0) {
170 level = -level;
171 level = (level*quant_matrix[j]) >> 4;
172 level = (level-1)|1;
173 level = -level;
174 } else {
175 level = (level*quant_matrix[j]) >> 4;
176 level = (level-1)|1;
177 }
178 }
179 if (i > 63) {
180 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
181 return -1;
182 }
183
184 block[j] = level;
185 }
186 CLOSE_READER(re, &s->gb);
187 }
188 return 0;
189 }
190
191 static int decode_motion(GetBitContext *gb)
192 {
193 int value = 0;
194 if (get_bits1(gb)) {
195 if (get_bits1(gb))
196 value = -17;
197 value += get_bits(gb, 4) + 1;
198 }
199 return value;
200 }
201
202 static int decode_mb(MadContext *s, AVFrame *frame, int inter)
203 {
204 int mv_map = 0;
205 int av_uninit(mv_x), av_uninit(mv_y);
206 int j;
207
208 if (inter) {
209 int v = decode210(&s->gb);
210 if (v < 2) {
211 mv_map = v ? get_bits(&s->gb, 6) : 63;
212 mv_x = decode_motion(&s->gb);
213 mv_y = decode_motion(&s->gb);
214 }
215 }
216
217 for (j=0; j<6; j++) {
218 if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
219 int add = 2*decode_motion(&s->gb);
220 if (s->last_frame->data[0])
221 comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
222 } else {
223 s->bdsp.clear_block(s->block);
224 if(decode_block_intra(s, s->block) < 0)
225 return -1;
226 idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
227 }
228 }
229 return 0;
230 }
231
232 static void calc_quant_matrix(MadContext *s, int qscale)
233 {
234 int i;
235
236 s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
237 for (i=1; i<64; i++)
238 s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
239 }
240
241 static int decode_frame(AVCodecContext *avctx,
242 void *data, int *got_frame,
243 AVPacket *avpkt)
244 {
245 const uint8_t *buf = avpkt->data;
246 int buf_size = avpkt->size;
247 MadContext *s = avctx->priv_data;
248 AVFrame *frame = data;
249 GetByteContext gb;
250 int width, height;
251 int chunk_type;
252 int inter, ret;
253
254 bytestream2_init(&gb, buf, buf_size);
255
256 chunk_type = bytestream2_get_le32(&gb);
257 inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
258 bytestream2_skip(&gb, 10);
259
260 av_reduce(&avctx->framerate.den, &avctx->framerate.num,
261 bytestream2_get_le16(&gb), 1000, 1<<30);
262
263 width = bytestream2_get_le16(&gb);
264 height = bytestream2_get_le16(&gb);
265 bytestream2_skip(&gb, 1);
266 calc_quant_matrix(s, bytestream2_get_byte(&gb));
267 bytestream2_skip(&gb, 2);
268
269 if (bytestream2_get_bytes_left(&gb) < 2) {
270 av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
271 return AVERROR_INVALIDDATA;
272 }
273
274 if (width < 16 || height < 16) {
275 av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n");
276 return AVERROR_INVALIDDATA;
277 }
278
279 if (avctx->width != width || avctx->height != height) {
280 av_frame_unref(s->last_frame);
281 if((width * height)/2048*7 > bytestream2_get_bytes_left(&gb))
282 return AVERROR_INVALIDDATA;
283 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
284 return ret;
285 }
286
287 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
288 return ret;
289
290 if (inter && !s->last_frame->data[0]) {
291 av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
292 ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
293 if (ret < 0)
294 return ret;
295 memset(s->last_frame->data[0], 0, s->last_frame->height *
296 s->last_frame->linesize[0]);
297 memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
298 s->last_frame->linesize[1]);
299 memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
300 s->last_frame->linesize[2]);
301 }
302
303 av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
304 bytestream2_get_bytes_left(&gb));
305 if (!s->bitstream_buf)
306 return AVERROR(ENOMEM);
307 s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
308 bytestream2_get_bytes_left(&gb) / 2);
309 memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, FF_INPUT_BUFFER_PADDING_SIZE);
310 init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb)));
311
312 for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
313 for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
314 if(decode_mb(s, frame, inter) < 0)
315 return AVERROR_INVALIDDATA;
316
317 *got_frame = 1;
318
319 if (chunk_type != MADe_TAG) {
320 av_frame_unref(s->last_frame);
321 if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
322 return ret;
323 }
324
325 return buf_size;
326 }
327
328 static av_cold int decode_end(AVCodecContext *avctx)
329 {
330 MadContext *t = avctx->priv_data;
331 av_frame_free(&t->last_frame);
332 av_freep(&t->bitstream_buf);
333 return 0;
334 }
335
336 AVCodec ff_eamad_decoder = {
337 .name = "eamad",
338 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video"),
339 .type = AVMEDIA_TYPE_VIDEO,
340 .id = AV_CODEC_ID_MAD,
341 .priv_data_size = sizeof(MadContext),
342 .init = decode_init,
343 .close = decode_end,
344 .decode = decode_frame,
345 .capabilities = CODEC_CAP_DR1,
346 };