Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / fic.c
1 /*
2 * Mirillis FIC decoder
3 *
4 * Copyright (c) 2014 Konstantin Shishkov
5 * Copyright (c) 2014 Derek Buitenhuis
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #include "libavutil/common.h"
25 #include "avcodec.h"
26 #include "internal.h"
27 #include "get_bits.h"
28 #include "golomb.h"
29
30 typedef struct FICThreadContext {
31 DECLARE_ALIGNED(16, int16_t, block)[64];
32 uint8_t *src;
33 int slice_h;
34 int src_size;
35 int y_off;
36 } FICThreadContext;
37
38 typedef struct FICContext {
39 AVCodecContext *avctx;
40 AVFrame *frame;
41 AVFrame *final_frame;
42
43 FICThreadContext *slice_data;
44 int slice_data_size;
45
46 const uint8_t *qmat;
47
48 enum AVPictureType cur_frame_type;
49
50 int aligned_width, aligned_height;
51 int num_slices, slice_h;
52
53 uint8_t cursor_buf[4096];
54 } FICContext;
55
56 static const uint8_t fic_qmat_hq[64] = {
57 1, 2, 2, 2, 3, 3, 3, 4,
58 2, 2, 2, 3, 3, 3, 4, 4,
59 2, 2, 3, 3, 3, 4, 4, 4,
60 2, 2, 3, 3, 3, 4, 4, 5,
61 2, 3, 3, 3, 4, 4, 5, 6,
62 3, 3, 3, 4, 4, 5, 6, 7,
63 3, 3, 3, 4, 4, 5, 7, 7,
64 3, 3, 4, 4, 5, 7, 7, 7,
65 };
66
67 static const uint8_t fic_qmat_lq[64] = {
68 1, 5, 6, 7, 8, 9, 9, 11,
69 5, 5, 7, 8, 9, 9, 11, 12,
70 6, 7, 8, 9, 9, 11, 11, 12,
71 7, 7, 8, 9, 9, 11, 12, 13,
72 7, 8, 9, 9, 10, 11, 13, 16,
73 8, 9, 9, 10, 11, 13, 16, 19,
74 8, 9, 9, 11, 12, 15, 18, 23,
75 9, 9, 11, 12, 15, 18, 23, 27
76 };
77
78 static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
79
80 #define FIC_HEADER_SIZE 27
81
82 static av_always_inline void fic_idct(int16_t *blk, int step, int shift, int rnd)
83 {
84 const int t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
85 const int t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
86 const int t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
87 const int t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
88 const int t4 = 5793 * (t2 + t0 + 0x800 >> 12);
89 const int t5 = 5793 * (t3 + t1 + 0x800 >> 12);
90 const int t6 = t2 - t0;
91 const int t7 = t3 - t1;
92 const int t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
93 const int t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
94 const int tA = (blk[0 * step] - blk[4 * step] << 15) + rnd;
95 const int tB = (blk[0 * step] + blk[4 * step] << 15) + rnd;
96 blk[0 * step] = ( t4 + t9 + tB) >> shift;
97 blk[1 * step] = ( t6 + t7 + t8 + tA) >> shift;
98 blk[2 * step] = ( t6 - t7 - t8 + tA) >> shift;
99 blk[3 * step] = ( t5 - t9 + tB) >> shift;
100 blk[4 * step] = ( -t5 - t9 + tB) >> shift;
101 blk[5 * step] = (-(t6 - t7) - t8 + tA) >> shift;
102 blk[6 * step] = (-(t6 + t7) + t8 + tA) >> shift;
103 blk[7 * step] = ( -t4 + t9 + tB) >> shift;
104 }
105
106 static void fic_idct_put(uint8_t *dst, int stride, int16_t *block)
107 {
108 int i, j;
109 int16_t *ptr;
110
111 ptr = block;
112 fic_idct(ptr++, 8, 13, (1 << 12) + (1 << 17));
113 for (i = 1; i < 8; i++) {
114 fic_idct(ptr, 8, 13, 1 << 12);
115 ptr++;
116 }
117
118 ptr = block;
119 for (i = 0; i < 8; i++) {
120 fic_idct(ptr, 1, 20, 0);
121 ptr += 8;
122 }
123
124 ptr = block;
125 for (j = 0; j < 8; j++) {
126 for (i = 0; i < 8; i++)
127 dst[i] = av_clip_uint8(ptr[i]);
128 dst += stride;
129 ptr += 8;
130 }
131 }
132 static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
133 uint8_t *dst, int stride, int16_t *block)
134 {
135 int i, num_coeff;
136
137 /* Is it a skip block? */
138 if (get_bits1(gb)) {
139 /* This is a P-frame. */
140 ctx->frame->key_frame = 0;
141 ctx->frame->pict_type = AV_PICTURE_TYPE_P;
142
143 return 0;
144 }
145
146 memset(block, 0, sizeof(*block) * 64);
147
148 num_coeff = get_bits(gb, 7);
149 if (num_coeff > 64)
150 return AVERROR_INVALIDDATA;
151
152 for (i = 0; i < num_coeff; i++)
153 block[ff_zigzag_direct[i]] = get_se_golomb(gb) *
154 ctx->qmat[ff_zigzag_direct[i]];
155
156 fic_idct_put(dst, stride, block);
157
158 return 0;
159 }
160
161 static int fic_decode_slice(AVCodecContext *avctx, void *tdata)
162 {
163 FICContext *ctx = avctx->priv_data;
164 FICThreadContext *tctx = tdata;
165 GetBitContext gb;
166 uint8_t *src = tctx->src;
167 int slice_h = tctx->slice_h;
168 int src_size = tctx->src_size;
169 int y_off = tctx->y_off;
170 int x, y, p;
171
172 init_get_bits(&gb, src, src_size * 8);
173
174 for (p = 0; p < 3; p++) {
175 int stride = ctx->frame->linesize[p];
176 uint8_t* dst = ctx->frame->data[p] + (y_off >> !!p) * stride;
177
178 for (y = 0; y < (slice_h >> !!p); y += 8) {
179 for (x = 0; x < (ctx->aligned_width >> !!p); x += 8) {
180 int ret;
181
182 if ((ret = fic_decode_block(ctx, &gb, dst + x, stride, tctx->block)) != 0)
183 return ret;
184 }
185
186 dst += 8 * stride;
187 }
188 }
189
190 return 0;
191 }
192
193 static av_always_inline void fic_alpha_blend(uint8_t *dst, uint8_t *src,
194 int size, uint8_t *alpha)
195 {
196 int i;
197
198 for (i = 0; i < size; i++)
199 dst[i] += ((src[i] - dst[i]) * alpha[i]) >> 8;
200 }
201
202 static void fic_draw_cursor(AVCodecContext *avctx, int cur_x, int cur_y)
203 {
204 FICContext *ctx = avctx->priv_data;
205 uint8_t *ptr = ctx->cursor_buf;
206 uint8_t *dstptr[3];
207 uint8_t planes[4][1024];
208 uint8_t chroma[3][256];
209 int i, j, p;
210
211 /* Convert to YUVA444. */
212 for (i = 0; i < 1024; i++) {
213 planes[0][i] = (( 25 * ptr[0] + 129 * ptr[1] + 66 * ptr[2]) / 255) + 16;
214 planes[1][i] = ((-38 * ptr[0] + 112 * ptr[1] + -74 * ptr[2]) / 255) + 128;
215 planes[2][i] = ((-18 * ptr[0] + 112 * ptr[1] + -94 * ptr[2]) / 255) + 128;
216 planes[3][i] = ptr[3];
217
218 ptr += 4;
219 }
220
221 /* Subsample chroma. */
222 for (i = 0; i < 32; i += 2)
223 for (j = 0; j < 32; j += 2)
224 for (p = 0; p < 3; p++)
225 chroma[p][16 * (i / 2) + j / 2] = (planes[p + 1][32 * i + j ] +
226 planes[p + 1][32 * i + j + 1] +
227 planes[p + 1][32 * (i + 1) + j ] +
228 planes[p + 1][32 * (i + 1) + j + 1]) / 4;
229
230 /* Seek to x/y pos of cursor. */
231 for (i = 0; i < 3; i++)
232 dstptr[i] = ctx->final_frame->data[i] +
233 (ctx->final_frame->linesize[i] * (cur_y >> !!i)) +
234 (cur_x >> !!i) + !!i;
235
236 /* Copy. */
237 for (i = 0; i < FFMIN(32, avctx->height - cur_y) - 1; i += 2) {
238 int lsize = FFMIN(32, avctx->width - cur_x);
239 int csize = lsize / 2;
240
241 fic_alpha_blend(dstptr[0],
242 planes[0] + i * 32, lsize, planes[3] + i * 32);
243 fic_alpha_blend(dstptr[0] + ctx->final_frame->linesize[0],
244 planes[0] + (i + 1) * 32, lsize, planes[3] + (i + 1) * 32);
245 fic_alpha_blend(dstptr[1],
246 chroma[0] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
247 fic_alpha_blend(dstptr[2],
248 chroma[1] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
249
250 dstptr[0] += ctx->final_frame->linesize[0] * 2;
251 dstptr[1] += ctx->final_frame->linesize[1];
252 dstptr[2] += ctx->final_frame->linesize[2];
253 }
254 }
255
256 static int fic_decode_frame(AVCodecContext *avctx, void *data,
257 int *got_frame, AVPacket *avpkt)
258 {
259 FICContext *ctx = avctx->priv_data;
260 uint8_t *src = avpkt->data;
261 int ret;
262 int slice, nslices;
263 int msize;
264 int tsize;
265 int cur_x, cur_y;
266 int skip_cursor = 0;
267 uint8_t *sdata;
268
269 if ((ret = ff_reget_buffer(avctx, ctx->frame)) < 0) {
270 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
271 return ret;
272 }
273
274 /* Header + at least one slice (4) */
275 if (avpkt->size < FIC_HEADER_SIZE + 4) {
276 av_log(avctx, AV_LOG_ERROR, "Frame data is too small.\n");
277 return AVERROR_INVALIDDATA;
278 }
279
280 /* Check for header. */
281 if (memcmp(src, fic_header, 7))
282 av_log(avctx, AV_LOG_WARNING, "Invalid FIC Header.\n");
283
284 /* Is it a skip frame? */
285 if (src[17]) {
286 if (!ctx->final_frame) {
287 av_log(avctx, AV_LOG_WARNING, "Initial frame is skipped\n");
288 return AVERROR_INVALIDDATA;
289 }
290 goto skip;
291 }
292
293 nslices = src[13];
294 if (!nslices) {
295 av_log(avctx, AV_LOG_ERROR, "Zero slices found.\n");
296 return AVERROR_INVALIDDATA;
297 }
298
299 /* High or Low Quality Matrix? */
300 ctx->qmat = src[23] ? fic_qmat_hq : fic_qmat_lq;
301
302 /* Skip cursor data. */
303 tsize = AV_RB24(src + 24);
304 if (tsize > avpkt->size - FIC_HEADER_SIZE) {
305 av_log(avctx, AV_LOG_ERROR,
306 "Packet is too small to contain cursor (%d vs %d bytes).\n",
307 tsize, avpkt->size - FIC_HEADER_SIZE);
308 return AVERROR_INVALIDDATA;
309 }
310
311 if (!tsize)
312 skip_cursor = 1;
313
314 if (!skip_cursor && tsize < 32) {
315 av_log(avctx, AV_LOG_WARNING,
316 "Cursor data too small. Skipping cursor.\n");
317 skip_cursor = 1;
318 }
319
320 /* Cursor position. */
321 cur_x = AV_RL16(src + 33);
322 cur_y = AV_RL16(src + 35);
323 if (!skip_cursor && (cur_x > avctx->width || cur_y > avctx->height)) {
324 av_log(avctx, AV_LOG_WARNING,
325 "Invalid cursor position: (%d,%d). Skipping cusor.\n",
326 cur_x, cur_y);
327 skip_cursor = 1;
328 }
329
330 if (!skip_cursor && (AV_RL16(src + 37) != 32 || AV_RL16(src + 39) != 32)) {
331 av_log(avctx, AV_LOG_WARNING,
332 "Invalid cursor size. Skipping cursor.\n");
333 skip_cursor = 1;
334 }
335
336 /* Slice height for all but the last slice. */
337 ctx->slice_h = 16 * (ctx->aligned_height >> 4) / nslices;
338 if (ctx->slice_h % 16)
339 ctx->slice_h = FFALIGN(ctx->slice_h - 16, 16);
340
341 /* First slice offset and remaining data. */
342 sdata = src + tsize + FIC_HEADER_SIZE + 4 * nslices;
343 msize = avpkt->size - nslices * 4 - tsize - FIC_HEADER_SIZE;
344
345 if (msize <= 0) {
346 av_log(avctx, AV_LOG_ERROR, "Not enough frame data to decode.\n");
347 return AVERROR_INVALIDDATA;
348 }
349
350 /*
351 * Set the frametype to I initially. It will be set to P if the frame
352 * has any dependencies (skip blocks). There will be a race condition
353 * inside the slice decode function to set these, but we do not care.
354 * since they will only ever be set to 0/P.
355 */
356 ctx->frame->key_frame = 1;
357 ctx->frame->pict_type = AV_PICTURE_TYPE_I;
358
359 /* Allocate slice data. */
360 av_fast_malloc(&ctx->slice_data, &ctx->slice_data_size,
361 nslices * sizeof(ctx->slice_data[0]));
362 if (!ctx->slice_data_size) {
363 av_log(avctx, AV_LOG_ERROR, "Could not allocate slice data.\n");
364 return AVERROR(ENOMEM);
365 }
366 memset(ctx->slice_data, 0, nslices * sizeof(ctx->slice_data[0]));
367
368 for (slice = 0; slice < nslices; slice++) {
369 unsigned slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
370 unsigned slice_size;
371 int y_off = ctx->slice_h * slice;
372 int slice_h = ctx->slice_h;
373
374 /*
375 * Either read the slice size, or consume all data left.
376 * Also, special case the last slight height.
377 */
378 if (slice == nslices - 1) {
379 slice_size = msize;
380 slice_h = FFALIGN(avctx->height - ctx->slice_h * (nslices - 1), 16);
381 } else {
382 slice_size = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4 + 4);
383 }
384
385 if (slice_size < slice_off || slice_size > msize)
386 continue;
387
388 slice_size -= slice_off;
389
390 ctx->slice_data[slice].src = sdata + slice_off;
391 ctx->slice_data[slice].src_size = slice_size;
392 ctx->slice_data[slice].slice_h = slice_h;
393 ctx->slice_data[slice].y_off = y_off;
394 }
395
396 if ((ret = avctx->execute(avctx, fic_decode_slice, ctx->slice_data,
397 NULL, nslices, sizeof(ctx->slice_data[0]))) < 0)
398 return ret;
399
400 av_frame_free(&ctx->final_frame);
401 ctx->final_frame = av_frame_clone(ctx->frame);
402 if (!ctx->final_frame) {
403 av_log(avctx, AV_LOG_ERROR, "Could not clone frame buffer.\n");
404 return AVERROR(ENOMEM);
405 }
406
407 /* Make sure we use a user-supplied buffer. */
408 if ((ret = ff_reget_buffer(avctx, ctx->final_frame)) < 0) {
409 av_log(avctx, AV_LOG_ERROR, "Could not make frame writable.\n");
410 return ret;
411 }
412
413 /* Draw cursor. */
414 if (!skip_cursor) {
415 memcpy(ctx->cursor_buf, src + 59, 32 * 32 * 4);
416 fic_draw_cursor(avctx, cur_x, cur_y);
417 }
418
419 skip:
420 *got_frame = 1;
421 if ((ret = av_frame_ref(data, ctx->final_frame)) < 0)
422 return ret;
423
424 return avpkt->size;
425 }
426
427 static av_cold int fic_decode_close(AVCodecContext *avctx)
428 {
429 FICContext *ctx = avctx->priv_data;
430
431 av_freep(&ctx->slice_data);
432 av_frame_free(&ctx->final_frame);
433 av_frame_free(&ctx->frame);
434
435 return 0;
436 }
437
438 static av_cold int fic_decode_init(AVCodecContext *avctx)
439 {
440 FICContext *ctx = avctx->priv_data;
441
442 /* Initialize various context values */
443 ctx->avctx = avctx;
444 ctx->aligned_width = FFALIGN(avctx->width, 16);
445 ctx->aligned_height = FFALIGN(avctx->height, 16);
446
447 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
448 avctx->bits_per_raw_sample = 8;
449
450 ctx->frame = av_frame_alloc();
451 if (!ctx->frame)
452 return AVERROR(ENOMEM);
453
454 return 0;
455 }
456
457 AVCodec ff_fic_decoder = {
458 .name = "fic",
459 .long_name = NULL_IF_CONFIG_SMALL("Mirillis FIC"),
460 .type = AVMEDIA_TYPE_VIDEO,
461 .id = AV_CODEC_ID_FIC,
462 .priv_data_size = sizeof(FICContext),
463 .init = fic_decode_init,
464 .decode = fic_decode_frame,
465 .close = fic_decode_close,
466 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
467 };