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1 | /* |
2 | * Flash Screen Video Version 2 encoder | |
3 | * Copyright (C) 2009 Joshua Warner | |
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 Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * Flash Screen Video Version 2 encoder | |
25 | * @author Joshua Warner | |
26 | */ | |
27 | ||
28 | /* Differences from version 1 stream: | |
29 | * NOTE: Currently, the only player that supports version 2 streams is Adobe Flash Player itself. | |
30 | * * Supports sending only a range of scanlines in a block, | |
31 | * indicating a difference from the corresponding block in the last keyframe. | |
32 | * * Supports initializing the zlib dictionary with data from the corresponding | |
33 | * block in the last keyframe, to improve compression. | |
34 | * * Supports a hybrid 15-bit rgb / 7-bit palette color space. | |
35 | */ | |
36 | ||
37 | /* TODO: | |
38 | * Don't keep Block structures for both current frame and keyframe. | |
39 | * Make better heuristics for deciding stream parameters (optimum_* functions). Currently these return constants. | |
40 | * Figure out how to encode palette information in the stream, choose an optimum palette at each keyframe. | |
41 | * Figure out how the zlibPrimeCompressCurrent flag works, implement support. | |
42 | * Find other sample files (that weren't generated here), develop a decoder. | |
43 | */ | |
44 | ||
45 | #include <stdio.h> | |
46 | #include <stdlib.h> | |
47 | #include <zlib.h> | |
48 | ||
49 | #include "libavutil/imgutils.h" | |
50 | #include "avcodec.h" | |
51 | #include "internal.h" | |
52 | #include "put_bits.h" | |
53 | #include "bytestream.h" | |
54 | ||
55 | #define HAS_IFRAME_IMAGE 0x02 | |
56 | #define HAS_PALLET_INFO 0x01 | |
57 | ||
58 | #define COLORSPACE_BGR 0x00 | |
59 | #define COLORSPACE_15_7 0x10 | |
60 | #define HAS_DIFF_BLOCKS 0x04 | |
61 | #define ZLIB_PRIME_COMPRESS_CURRENT 0x02 | |
62 | #define ZLIB_PRIME_COMPRESS_PREVIOUS 0x01 | |
63 | ||
64 | // Disables experimental "smart" parameter-choosing code, as well as the statistics that it depends on. | |
65 | // At the moment, the "smart" code is a great example of how the parameters *shouldn't* be chosen. | |
66 | #define FLASHSV2_DUMB | |
67 | ||
68 | typedef struct Block { | |
69 | uint8_t *enc; | |
70 | uint8_t *sl_begin, *sl_end; | |
71 | int enc_size; | |
72 | uint8_t *data; | |
73 | unsigned long data_size; | |
74 | ||
75 | uint8_t start, len; | |
76 | uint8_t dirty; | |
77 | uint8_t col, row, width, height; | |
78 | uint8_t flags; | |
79 | } Block; | |
80 | ||
81 | typedef struct Palette { | |
82 | unsigned colors[128]; | |
83 | uint8_t index[1 << 15]; | |
84 | } Palette; | |
85 | ||
86 | typedef struct FlashSV2Context { | |
87 | AVCodecContext *avctx; | |
88 | uint8_t *current_frame; | |
89 | uint8_t *key_frame; | |
90 | uint8_t *encbuffer; | |
91 | uint8_t *keybuffer; | |
92 | uint8_t *databuffer; | |
93 | ||
94 | uint8_t *blockbuffer; | |
95 | int blockbuffer_size; | |
96 | ||
97 | Block *frame_blocks; | |
98 | Block *key_blocks; | |
99 | int frame_size; | |
100 | int blocks_size; | |
101 | ||
102 | int use15_7, dist, comp; | |
103 | ||
104 | int rows, cols; | |
105 | ||
106 | int last_key_frame; | |
107 | ||
108 | int image_width, image_height; | |
109 | int block_width, block_height; | |
110 | uint8_t flags; | |
111 | uint8_t use_custom_palette; | |
112 | uint8_t palette_type; ///< 0=>default, 1=>custom - changed when palette regenerated. | |
113 | Palette palette; | |
114 | #ifndef FLASHSV2_DUMB | |
115 | double tot_blocks; ///< blocks encoded since last keyframe | |
116 | double diff_blocks; ///< blocks that were different since last keyframe | |
117 | double tot_lines; ///< total scanlines in image since last keyframe | |
118 | double diff_lines; ///< scanlines that were different since last keyframe | |
119 | double raw_size; ///< size of raw frames since last keyframe | |
120 | double comp_size; ///< size of compressed data since last keyframe | |
121 | double uncomp_size; ///< size of uncompressed data since last keyframe | |
122 | ||
123 | double total_bits; ///< total bits written to stream so far | |
124 | #endif | |
125 | } FlashSV2Context; | |
126 | ||
127 | static av_cold void cleanup(FlashSV2Context * s) | |
128 | { | |
129 | av_freep(&s->encbuffer); | |
130 | av_freep(&s->keybuffer); | |
131 | av_freep(&s->databuffer); | |
132 | av_freep(&s->blockbuffer); | |
133 | av_freep(&s->current_frame); | |
134 | av_freep(&s->key_frame); | |
135 | ||
136 | av_freep(&s->frame_blocks); | |
137 | av_freep(&s->key_blocks); | |
138 | } | |
139 | ||
140 | static void init_blocks(FlashSV2Context * s, Block * blocks, | |
141 | uint8_t * encbuf, uint8_t * databuf) | |
142 | { | |
143 | int row, col; | |
144 | Block *b; | |
145 | for (col = 0; col < s->cols; col++) { | |
146 | for (row = 0; row < s->rows; row++) { | |
147 | b = blocks + (col + row * s->cols); | |
148 | b->width = (col < s->cols - 1) ? | |
149 | s->block_width : | |
150 | s->image_width - col * s->block_width; | |
151 | ||
152 | b->height = (row < s->rows - 1) ? | |
153 | s->block_height : | |
154 | s->image_height - row * s->block_height; | |
155 | ||
156 | b->row = row; | |
157 | b->col = col; | |
158 | b->enc = encbuf; | |
159 | b->data = databuf; | |
160 | encbuf += b->width * b->height * 3; | |
161 | databuf += !databuf ? 0 : b->width * b->height * 6; | |
162 | } | |
163 | } | |
164 | } | |
165 | ||
166 | static void reset_stats(FlashSV2Context * s) | |
167 | { | |
168 | #ifndef FLASHSV2_DUMB | |
169 | s->diff_blocks = 0.1; | |
170 | s->tot_blocks = 1; | |
171 | s->diff_lines = 0.1; | |
172 | s->tot_lines = 1; | |
173 | s->raw_size = s->comp_size = s->uncomp_size = 10; | |
174 | #endif | |
175 | } | |
176 | ||
177 | static av_cold int flashsv2_encode_init(AVCodecContext * avctx) | |
178 | { | |
179 | FlashSV2Context *s = avctx->priv_data; | |
180 | ||
181 | s->avctx = avctx; | |
182 | ||
183 | s->comp = avctx->compression_level; | |
184 | if (s->comp == -1) | |
185 | s->comp = 9; | |
186 | if (s->comp < 0 || s->comp > 9) { | |
187 | av_log(avctx, AV_LOG_ERROR, | |
188 | "Compression level should be 0-9, not %d\n", s->comp); | |
189 | return -1; | |
190 | } | |
191 | ||
192 | ||
193 | if ((avctx->width > 4095) || (avctx->height > 4095)) { | |
194 | av_log(avctx, AV_LOG_ERROR, | |
f6fa7814 | 195 | "Input dimensions too large, input must be max 4095x4095 !\n"); |
2ba45a60 DM |
196 | return -1; |
197 | } | |
198 | if ((avctx->width < 16) || (avctx->height < 16)) { | |
199 | av_log(avctx, AV_LOG_ERROR, | |
200 | "Input dimensions too small, input must be at least 16x16 !\n"); | |
201 | return -1; | |
202 | } | |
203 | ||
204 | if (av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0) | |
205 | return -1; | |
206 | ||
207 | ||
208 | s->last_key_frame = 0; | |
209 | ||
210 | s->image_width = avctx->width; | |
211 | s->image_height = avctx->height; | |
212 | ||
213 | s->block_width = (s->image_width / 12) & ~15; | |
214 | s->block_height = (s->image_height / 12) & ~15; | |
215 | ||
216 | if(!s->block_width) | |
217 | s->block_width = 1; | |
218 | if(!s->block_height) | |
219 | s->block_height = 1; | |
220 | ||
221 | s->rows = (s->image_height + s->block_height - 1) / s->block_height; | |
222 | s->cols = (s->image_width + s->block_width - 1) / s->block_width; | |
223 | ||
224 | s->frame_size = s->image_width * s->image_height * 3; | |
225 | s->blocks_size = s->rows * s->cols * sizeof(Block); | |
226 | ||
227 | s->encbuffer = av_mallocz(s->frame_size); | |
228 | s->keybuffer = av_mallocz(s->frame_size); | |
229 | s->databuffer = av_mallocz(s->frame_size * 6); | |
230 | s->current_frame = av_mallocz(s->frame_size); | |
231 | s->key_frame = av_mallocz(s->frame_size); | |
232 | s->frame_blocks = av_mallocz(s->blocks_size); | |
233 | s->key_blocks = av_mallocz(s->blocks_size); | |
234 | ||
235 | s->blockbuffer = NULL; | |
236 | s->blockbuffer_size = 0; | |
237 | ||
238 | init_blocks(s, s->frame_blocks, s->encbuffer, s->databuffer); | |
239 | init_blocks(s, s->key_blocks, s->keybuffer, 0); | |
240 | reset_stats(s); | |
241 | #ifndef FLASHSV2_DUMB | |
242 | s->total_bits = 1; | |
243 | #endif | |
244 | ||
245 | s->use_custom_palette = 0; | |
246 | s->palette_type = -1; // so that the palette will be generated in reconfigure_at_keyframe | |
247 | ||
248 | if (!s->encbuffer || !s->keybuffer || !s->databuffer | |
249 | || !s->current_frame || !s->key_frame || !s->key_blocks | |
250 | || !s->frame_blocks) { | |
251 | av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n"); | |
252 | cleanup(s); | |
253 | return -1; | |
254 | } | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static int new_key_frame(FlashSV2Context * s) | |
260 | { | |
261 | int i; | |
262 | memcpy(s->key_blocks, s->frame_blocks, s->blocks_size); | |
263 | memcpy(s->key_frame, s->current_frame, s->frame_size); | |
264 | ||
265 | for (i = 0; i < s->rows * s->cols; i++) { | |
266 | s->key_blocks[i].enc += (s->keybuffer - s->encbuffer); | |
267 | s->key_blocks[i].sl_begin = 0; | |
268 | s->key_blocks[i].sl_end = 0; | |
269 | s->key_blocks[i].data = 0; | |
270 | } | |
271 | memcpy(s->keybuffer, s->encbuffer, s->frame_size); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static int write_palette(FlashSV2Context * s, uint8_t * buf, int buf_size) | |
277 | { | |
278 | //this isn't implemented yet! Default palette only! | |
279 | return -1; | |
280 | } | |
281 | ||
282 | static int write_header(FlashSV2Context * s, uint8_t * buf, int buf_size) | |
283 | { | |
284 | PutBitContext pb; | |
285 | int buf_pos, len; | |
286 | ||
287 | if (buf_size < 5) | |
288 | return -1; | |
289 | ||
290 | init_put_bits(&pb, buf, buf_size * 8); | |
291 | ||
292 | put_bits(&pb, 4, (s->block_width >> 4) - 1); | |
293 | put_bits(&pb, 12, s->image_width); | |
294 | put_bits(&pb, 4, (s->block_height >> 4) - 1); | |
295 | put_bits(&pb, 12, s->image_height); | |
296 | ||
297 | flush_put_bits(&pb); | |
298 | buf_pos = 4; | |
299 | ||
300 | buf[buf_pos++] = s->flags; | |
301 | ||
302 | if (s->flags & HAS_PALLET_INFO) { | |
303 | len = write_palette(s, buf + buf_pos, buf_size - buf_pos); | |
304 | if (len < 0) | |
305 | return -1; | |
306 | buf_pos += len; | |
307 | } | |
308 | ||
309 | return buf_pos; | |
310 | } | |
311 | ||
312 | static int write_block(Block * b, uint8_t * buf, int buf_size) | |
313 | { | |
314 | int buf_pos = 0; | |
315 | unsigned block_size = b->data_size; | |
316 | ||
317 | if (b->flags & HAS_DIFF_BLOCKS) | |
318 | block_size += 2; | |
319 | if (b->flags & ZLIB_PRIME_COMPRESS_CURRENT) | |
320 | block_size += 2; | |
321 | if (block_size > 0) | |
322 | block_size += 1; | |
323 | if (buf_size < block_size + 2) | |
324 | return -1; | |
325 | ||
326 | buf[buf_pos++] = block_size >> 8; | |
327 | buf[buf_pos++] = block_size; | |
328 | ||
329 | if (block_size == 0) | |
330 | return buf_pos; | |
331 | ||
332 | buf[buf_pos++] = b->flags; | |
333 | ||
334 | if (b->flags & HAS_DIFF_BLOCKS) { | |
335 | buf[buf_pos++] = (b->start); | |
336 | buf[buf_pos++] = (b->len); | |
337 | } | |
338 | ||
339 | if (b->flags & ZLIB_PRIME_COMPRESS_CURRENT) { | |
340 | //This feature of the format is poorly understood, and as of now, unused. | |
341 | buf[buf_pos++] = (b->col); | |
342 | buf[buf_pos++] = (b->row); | |
343 | } | |
344 | ||
345 | memcpy(buf + buf_pos, b->data, b->data_size); | |
346 | ||
347 | buf_pos += b->data_size; | |
348 | ||
349 | return buf_pos; | |
350 | } | |
351 | ||
352 | static int encode_zlib(Block * b, uint8_t * buf, unsigned long *buf_size, int comp) | |
353 | { | |
354 | int res = compress2(buf, buf_size, b->sl_begin, b->sl_end - b->sl_begin, comp); | |
355 | return res == Z_OK ? 0 : -1; | |
356 | } | |
357 | ||
358 | static int encode_zlibprime(Block * b, Block * prime, uint8_t * buf, | |
359 | int *buf_size, int comp) | |
360 | { | |
361 | z_stream s; | |
362 | int res; | |
363 | s.zalloc = NULL; | |
364 | s.zfree = NULL; | |
365 | s.opaque = NULL; | |
366 | res = deflateInit(&s, comp); | |
367 | if (res < 0) | |
368 | return -1; | |
369 | ||
370 | s.next_in = prime->enc; | |
371 | s.avail_in = prime->enc_size; | |
372 | while (s.avail_in > 0) { | |
373 | s.next_out = buf; | |
374 | s.avail_out = *buf_size; | |
375 | res = deflate(&s, Z_SYNC_FLUSH); | |
376 | if (res < 0) | |
377 | return -1; | |
378 | } | |
379 | ||
380 | s.next_in = b->sl_begin; | |
381 | s.avail_in = b->sl_end - b->sl_begin; | |
382 | s.next_out = buf; | |
383 | s.avail_out = *buf_size; | |
384 | res = deflate(&s, Z_FINISH); | |
385 | deflateEnd(&s); | |
386 | *buf_size -= s.avail_out; | |
387 | if (res != Z_STREAM_END) | |
388 | return -1; | |
389 | return 0; | |
390 | } | |
391 | ||
392 | static int encode_bgr(Block * b, const uint8_t * src, int stride) | |
393 | { | |
394 | int i; | |
395 | uint8_t *ptr = b->enc; | |
396 | for (i = 0; i < b->start; i++) | |
397 | memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3); | |
398 | b->sl_begin = ptr + i * b->width * 3; | |
399 | for (; i < b->start + b->len; i++) | |
400 | memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3); | |
401 | b->sl_end = ptr + i * b->width * 3; | |
402 | for (; i < b->height; i++) | |
403 | memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3); | |
404 | b->enc_size = ptr + i * b->width * 3 - b->enc; | |
405 | return b->enc_size; | |
406 | } | |
407 | ||
408 | static inline unsigned pixel_color15(const uint8_t * src) | |
409 | { | |
410 | return (src[0] >> 3) | ((src[1] & 0xf8) << 2) | ((src[2] & 0xf8) << 7); | |
411 | } | |
412 | ||
413 | static inline unsigned int chroma_diff(unsigned int c1, unsigned int c2) | |
414 | { | |
415 | unsigned int t1 = (c1 & 0x000000ff) + ((c1 & 0x0000ff00) >> 8) + ((c1 & 0x00ff0000) >> 16); | |
416 | unsigned int t2 = (c2 & 0x000000ff) + ((c2 & 0x0000ff00) >> 8) + ((c2 & 0x00ff0000) >> 16); | |
417 | ||
418 | return abs(t1 - t2) + abs((c1 & 0x000000ff) - (c2 & 0x000000ff)) + | |
419 | abs(((c1 & 0x0000ff00) >> 8) - ((c2 & 0x0000ff00) >> 8)) + | |
420 | abs(((c1 & 0x00ff0000) >> 16) - ((c2 & 0x00ff0000) >> 16)); | |
421 | } | |
422 | ||
423 | static inline int pixel_color7_fast(Palette * palette, unsigned c15) | |
424 | { | |
425 | return palette->index[c15]; | |
426 | } | |
427 | ||
428 | static int pixel_color7_slow(Palette * palette, unsigned color) | |
429 | { | |
430 | int i, min = 0x7fffffff; | |
431 | int minc = -1; | |
432 | for (i = 0; i < 128; i++) { | |
433 | int c1 = palette->colors[i]; | |
434 | int diff = chroma_diff(c1, color); | |
435 | if (diff < min) { | |
436 | min = diff; | |
437 | minc = i; | |
438 | } | |
439 | } | |
440 | return minc; | |
441 | } | |
442 | ||
443 | static inline unsigned pixel_bgr(const uint8_t * src) | |
444 | { | |
445 | return (src[0]) | (src[1] << 8) | (src[2] << 16); | |
446 | } | |
447 | ||
448 | static int write_pixel_15_7(Palette * palette, uint8_t * dest, const uint8_t * src, | |
449 | int dist) | |
450 | { | |
451 | unsigned c15 = pixel_color15(src); | |
452 | unsigned color = pixel_bgr(src); | |
453 | int d15 = chroma_diff(color, color & 0x00f8f8f8); | |
454 | int c7 = pixel_color7_fast(palette, c15); | |
455 | int d7 = chroma_diff(color, palette->colors[c7]); | |
456 | if (dist + d15 >= d7) { | |
457 | dest[0] = c7; | |
458 | return 1; | |
459 | } else { | |
460 | dest[0] = 0x80 | (c15 >> 8); | |
461 | dest[1] = c15 & 0xff; | |
462 | return 2; | |
463 | } | |
464 | } | |
465 | ||
466 | static int update_palette_index(Palette * palette) | |
467 | { | |
468 | int r, g, b; | |
469 | unsigned int bgr, c15, index; | |
470 | for (r = 4; r < 256; r += 8) { | |
471 | for (g = 4; g < 256; g += 8) { | |
472 | for (b = 4; b < 256; b += 8) { | |
473 | bgr = b | (g << 8) | (r << 16); | |
474 | c15 = (b >> 3) | ((g & 0xf8) << 2) | ((r & 0xf8) << 7); | |
475 | index = pixel_color7_slow(palette, bgr); | |
476 | ||
477 | palette->index[c15] = index; | |
478 | } | |
479 | } | |
480 | } | |
481 | return 0; | |
482 | } | |
483 | ||
484 | static const unsigned int default_screen_video_v2_palette[128] = { | |
485 | 0x00000000, 0x00333333, 0x00666666, 0x00999999, 0x00CCCCCC, 0x00FFFFFF, | |
486 | 0x00330000, 0x00660000, 0x00990000, 0x00CC0000, 0x00FF0000, 0x00003300, | |
487 | 0x00006600, 0x00009900, 0x0000CC00, 0x0000FF00, 0x00000033, 0x00000066, | |
488 | 0x00000099, 0x000000CC, 0x000000FF, 0x00333300, 0x00666600, 0x00999900, | |
489 | 0x00CCCC00, 0x00FFFF00, 0x00003333, 0x00006666, 0x00009999, 0x0000CCCC, | |
490 | 0x0000FFFF, 0x00330033, 0x00660066, 0x00990099, 0x00CC00CC, 0x00FF00FF, | |
491 | 0x00FFFF33, 0x00FFFF66, 0x00FFFF99, 0x00FFFFCC, 0x00FF33FF, 0x00FF66FF, | |
492 | 0x00FF99FF, 0x00FFCCFF, 0x0033FFFF, 0x0066FFFF, 0x0099FFFF, 0x00CCFFFF, | |
493 | 0x00CCCC33, 0x00CCCC66, 0x00CCCC99, 0x00CCCCFF, 0x00CC33CC, 0x00CC66CC, | |
494 | 0x00CC99CC, 0x00CCFFCC, 0x0033CCCC, 0x0066CCCC, 0x0099CCCC, 0x00FFCCCC, | |
495 | 0x00999933, 0x00999966, 0x009999CC, 0x009999FF, 0x00993399, 0x00996699, | |
496 | 0x0099CC99, 0x0099FF99, 0x00339999, 0x00669999, 0x00CC9999, 0x00FF9999, | |
497 | 0x00666633, 0x00666699, 0x006666CC, 0x006666FF, 0x00663366, 0x00669966, | |
498 | 0x0066CC66, 0x0066FF66, 0x00336666, 0x00996666, 0x00CC6666, 0x00FF6666, | |
499 | 0x00333366, 0x00333399, 0x003333CC, 0x003333FF, 0x00336633, 0x00339933, | |
500 | 0x0033CC33, 0x0033FF33, 0x00663333, 0x00993333, 0x00CC3333, 0x00FF3333, | |
501 | 0x00003366, 0x00336600, 0x00660033, 0x00006633, 0x00330066, 0x00663300, | |
502 | 0x00336699, 0x00669933, 0x00993366, 0x00339966, 0x00663399, 0x00996633, | |
503 | 0x006699CC, 0x0099CC66, 0x00CC6699, 0x0066CC99, 0x009966CC, 0x00CC9966, | |
504 | 0x0099CCFF, 0x00CCFF99, 0x00FF99CC, 0x0099FFCC, 0x00CC99FF, 0x00FFCC99, | |
505 | 0x00111111, 0x00222222, 0x00444444, 0x00555555, 0x00AAAAAA, 0x00BBBBBB, | |
506 | 0x00DDDDDD, 0x00EEEEEE | |
507 | }; | |
508 | ||
509 | static int generate_default_palette(Palette * palette) | |
510 | { | |
511 | memcpy(palette->colors, default_screen_video_v2_palette, | |
512 | sizeof(default_screen_video_v2_palette)); | |
513 | ||
514 | return update_palette_index(palette); | |
515 | } | |
516 | ||
517 | static int generate_optimum_palette(Palette * palette, const uint8_t * image, | |
518 | int width, int height, int stride) | |
519 | { | |
520 | //this isn't implemented yet! Default palette only! | |
521 | return -1; | |
522 | } | |
523 | ||
524 | static inline int encode_15_7_sl(Palette * palette, uint8_t * dest, | |
525 | const uint8_t * src, int width, int dist) | |
526 | { | |
527 | int len = 0, x; | |
528 | for (x = 0; x < width; x++) { | |
529 | len += write_pixel_15_7(palette, dest + len, src + 3 * x, dist); | |
530 | } | |
531 | return len; | |
532 | } | |
533 | ||
534 | static int encode_15_7(Palette * palette, Block * b, const uint8_t * src, | |
535 | int stride, int dist) | |
536 | { | |
537 | int i; | |
538 | uint8_t *ptr = b->enc; | |
539 | for (i = 0; i < b->start; i++) | |
540 | ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist); | |
541 | b->sl_begin = ptr; | |
542 | for (; i < b->start + b->len; i++) | |
543 | ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist); | |
544 | b->sl_end = ptr; | |
545 | for (; i < b->height; i++) | |
546 | ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist); | |
547 | b->enc_size = ptr - b->enc; | |
548 | return b->enc_size; | |
549 | } | |
550 | ||
551 | static int encode_block(FlashSV2Context *s, Palette * palette, Block * b, | |
552 | Block * prev, const uint8_t * src, int stride, int comp, | |
553 | int dist, int keyframe) | |
554 | { | |
555 | unsigned buf_size = b->width * b->height * 6; | |
556 | uint8_t *buf = s->blockbuffer; | |
557 | int res; | |
558 | ||
559 | if (b->flags & COLORSPACE_15_7) { | |
560 | encode_15_7(palette, b, src, stride, dist); | |
561 | } else { | |
562 | encode_bgr(b, src, stride); | |
563 | } | |
564 | ||
565 | if (b->len > 0) { | |
566 | b->data_size = buf_size; | |
567 | res = encode_zlib(b, b->data, &b->data_size, comp); | |
568 | if (res) | |
569 | return res; | |
570 | ||
571 | if (!keyframe) { | |
572 | res = encode_zlibprime(b, prev, buf, &buf_size, comp); | |
573 | if (res) | |
574 | return res; | |
575 | ||
576 | if (buf_size < b->data_size) { | |
577 | b->data_size = buf_size; | |
578 | memcpy(b->data, buf, buf_size); | |
579 | b->flags |= ZLIB_PRIME_COMPRESS_PREVIOUS; | |
580 | } | |
581 | } | |
582 | } else { | |
583 | b->data_size = 0; | |
584 | } | |
585 | return 0; | |
586 | } | |
587 | ||
588 | static int compare_sl(FlashSV2Context * s, Block * b, const uint8_t * src, | |
589 | uint8_t * frame, uint8_t * key, int y, int keyframe) | |
590 | { | |
591 | if (memcmp(src, frame, b->width * 3) != 0) { | |
592 | b->dirty = 1; | |
593 | memcpy(frame, src, b->width * 3); | |
594 | #ifndef FLASHSV2_DUMB | |
595 | s->diff_lines++; | |
596 | #endif | |
597 | } | |
598 | if (memcmp(src, key, b->width * 3) != 0) { | |
599 | if (b->len == 0) | |
600 | b->start = y; | |
601 | b->len = y + 1 - b->start; | |
602 | } | |
603 | return 0; | |
604 | } | |
605 | ||
606 | static int mark_all_blocks(FlashSV2Context * s, const uint8_t * src, int stride, | |
607 | int keyframe) | |
608 | { | |
609 | int sl, rsl, col, pos, possl; | |
610 | Block *b; | |
611 | for (sl = s->image_height - 1; sl >= 0; sl--) { | |
612 | for (col = 0; col < s->cols; col++) { | |
613 | rsl = s->image_height - sl - 1; | |
614 | b = s->frame_blocks + col + rsl / s->block_height * s->cols; | |
615 | possl = stride * sl + col * s->block_width * 3; | |
616 | pos = s->image_width * rsl * 3 + col * s->block_width * 3; | |
617 | compare_sl(s, b, src + possl, s->current_frame + pos, | |
618 | s->key_frame + pos, rsl % s->block_height, keyframe); | |
619 | } | |
620 | } | |
621 | #ifndef FLASHSV2_DUMB | |
622 | s->tot_lines += s->image_height * s->cols; | |
623 | #endif | |
624 | return 0; | |
625 | } | |
626 | ||
627 | static int encode_all_blocks(FlashSV2Context * s, int keyframe) | |
628 | { | |
629 | int row, col, res; | |
630 | uint8_t *data; | |
631 | Block *b, *prev; | |
632 | for (row = 0; row < s->rows; row++) { | |
633 | for (col = 0; col < s->cols; col++) { | |
634 | b = s->frame_blocks + (row * s->cols + col); | |
635 | prev = s->key_blocks + (row * s->cols + col); | |
636 | b->flags = s->use15_7 ? COLORSPACE_15_7 : 0; | |
637 | if (keyframe) { | |
638 | b->start = 0; | |
639 | b->len = b->height; | |
640 | } else if (!b->dirty) { | |
641 | b->start = 0; | |
642 | b->len = 0; | |
643 | b->data_size = 0; | |
644 | continue; | |
645 | } else if (b->start != 0 || b->len != b->height) { | |
646 | b->flags |= HAS_DIFF_BLOCKS; | |
647 | } | |
648 | data = s->current_frame + s->image_width * 3 * s->block_height * row + s->block_width * col * 3; | |
649 | res = encode_block(s, &s->palette, b, prev, data, s->image_width * 3, s->comp, s->dist, keyframe); | |
650 | #ifndef FLASHSV2_DUMB | |
651 | if (b->dirty) | |
652 | s->diff_blocks++; | |
653 | s->comp_size += b->data_size; | |
654 | s->uncomp_size += b->enc_size; | |
655 | #endif | |
656 | if (res) | |
657 | return res; | |
658 | } | |
659 | } | |
660 | #ifndef FLASHSV2_DUMB | |
661 | s->raw_size += s->image_width * s->image_height * 3; | |
662 | s->tot_blocks += s->rows * s->cols; | |
663 | #endif | |
664 | return 0; | |
665 | } | |
666 | ||
667 | static int write_all_blocks(FlashSV2Context * s, uint8_t * buf, | |
668 | int buf_size) | |
669 | { | |
670 | int row, col, buf_pos = 0, len; | |
671 | Block *b; | |
672 | for (row = 0; row < s->rows; row++) { | |
673 | for (col = 0; col < s->cols; col++) { | |
674 | b = s->frame_blocks + row * s->cols + col; | |
675 | len = write_block(b, buf + buf_pos, buf_size - buf_pos); | |
676 | b->start = b->len = b->dirty = 0; | |
677 | if (len < 0) | |
678 | return len; | |
679 | buf_pos += len; | |
680 | } | |
681 | } | |
682 | return buf_pos; | |
683 | } | |
684 | ||
685 | static int write_bitstream(FlashSV2Context * s, const uint8_t * src, int stride, | |
686 | uint8_t * buf, int buf_size, int keyframe) | |
687 | { | |
688 | int buf_pos, res; | |
689 | ||
690 | res = mark_all_blocks(s, src, stride, keyframe); | |
691 | if (res) | |
692 | return res; | |
693 | res = encode_all_blocks(s, keyframe); | |
694 | if (res) | |
695 | return res; | |
696 | ||
697 | res = write_header(s, buf, buf_size); | |
698 | if (res < 0) { | |
699 | return res; | |
700 | } else { | |
701 | buf_pos = res; | |
702 | } | |
703 | res = write_all_blocks(s, buf + buf_pos, buf_size - buf_pos); | |
704 | if (res < 0) | |
705 | return res; | |
706 | buf_pos += res; | |
707 | #ifndef FLASHSV2_DUMB | |
708 | s->total_bits += ((double) buf_pos) * 8.0; | |
709 | #endif | |
710 | ||
711 | return buf_pos; | |
712 | } | |
713 | ||
714 | static void recommend_keyframe(FlashSV2Context * s, int *keyframe) | |
715 | { | |
716 | #ifndef FLASHSV2_DUMB | |
717 | double block_ratio, line_ratio, enc_ratio, comp_ratio, data_ratio; | |
718 | if (s->avctx->gop_size > 0) { | |
719 | block_ratio = s->diff_blocks / s->tot_blocks; | |
720 | line_ratio = s->diff_lines / s->tot_lines; | |
721 | enc_ratio = s->uncomp_size / s->raw_size; | |
722 | comp_ratio = s->comp_size / s->uncomp_size; | |
723 | data_ratio = s->comp_size / s->raw_size; | |
724 | ||
725 | if ((block_ratio >= 0.5 && line_ratio / block_ratio <= 0.5) || line_ratio >= 0.95) { | |
726 | *keyframe = 1; | |
727 | return; | |
728 | } | |
729 | } | |
730 | #else | |
731 | return; | |
732 | #endif | |
733 | } | |
734 | ||
735 | #ifndef FLASHSV2_DUMB | |
736 | static const double block_size_fraction = 1.0 / 300; | |
737 | static const double use15_7_threshold = 8192; | |
738 | static const double color15_7_factor = 100; | |
739 | #endif | |
740 | static int optimum_block_width(FlashSV2Context * s) | |
741 | { | |
742 | #ifndef FLASHSV2_DUMB | |
743 | double save = (1-pow(s->diff_lines/s->diff_blocks/s->block_height, 0.5)) * s->comp_size/s->tot_blocks; | |
744 | double width = block_size_fraction * sqrt(0.5 * save * s->rows * s->cols) * s->image_width; | |
745 | int pwidth = ((int) width); | |
746 | return FFCLIP(pwidth & ~15, 256, 16); | |
747 | #else | |
748 | return 64; | |
749 | #endif | |
750 | } | |
751 | ||
752 | static int optimum_block_height(FlashSV2Context * s) | |
753 | { | |
754 | #ifndef FLASHSV2_DUMB | |
755 | double save = (1-pow(s->diff_lines/s->diff_blocks/s->block_height, 0.5)) * s->comp_size/s->tot_blocks; | |
756 | double height = block_size_fraction * sqrt(0.5 * save * s->rows * s->cols) * s->image_height; | |
757 | int pheight = ((int) height); | |
758 | return FFCLIP(pheight & ~15, 256, 16); | |
759 | #else | |
760 | return 64; | |
761 | #endif | |
762 | } | |
763 | ||
764 | static int optimum_use15_7(FlashSV2Context * s) | |
765 | { | |
766 | #ifndef FLASHSV2_DUMB | |
767 | double ideal = ((double)(s->avctx->bit_rate * s->avctx->time_base.den * s->avctx->ticks_per_frame)) / | |
768 | ((double) s->avctx->time_base.num) * s->avctx->frame_number; | |
769 | if (ideal + use15_7_threshold < s->total_bits) { | |
770 | return 1; | |
771 | } else { | |
772 | return 0; | |
773 | } | |
774 | #else | |
775 | return s->avctx->global_quality == 0; | |
776 | #endif | |
777 | } | |
778 | ||
779 | static int optimum_dist(FlashSV2Context * s) | |
780 | { | |
781 | #ifndef FLASHSV2_DUMB | |
782 | double ideal = | |
783 | s->avctx->bit_rate * s->avctx->time_base.den * | |
784 | s->avctx->ticks_per_frame; | |
785 | int dist = pow((s->total_bits / ideal) * color15_7_factor, 3); | |
786 | av_log(s->avctx, AV_LOG_DEBUG, "dist: %d\n", dist); | |
787 | return dist; | |
788 | #else | |
789 | return 15; | |
790 | #endif | |
791 | } | |
792 | ||
793 | ||
794 | static int reconfigure_at_keyframe(FlashSV2Context * s, const uint8_t * image, | |
795 | int stride) | |
796 | { | |
797 | int update_palette = 0; | |
798 | int res; | |
799 | int block_width = optimum_block_width (s); | |
800 | int block_height = optimum_block_height(s); | |
801 | ||
802 | s->rows = (s->image_height + block_height - 1) / block_height; | |
803 | s->cols = (s->image_width + block_width - 1) / block_width; | |
804 | ||
805 | if (block_width != s->block_width || block_height != s->block_height) { | |
806 | s->block_width = block_width; | |
807 | s->block_height = block_height; | |
808 | if (s->rows * s->cols > s->blocks_size / sizeof(Block)) { | |
809 | s->frame_blocks = av_realloc(s->frame_blocks, s->rows * s->cols * sizeof(Block)); | |
810 | s->key_blocks = av_realloc(s->key_blocks, s->cols * s->rows * sizeof(Block)); | |
811 | if (!s->frame_blocks || !s->key_blocks) { | |
812 | av_log(s->avctx, AV_LOG_ERROR, "Memory allocation failed.\n"); | |
813 | return -1; | |
814 | } | |
815 | s->blocks_size = s->rows * s->cols * sizeof(Block); | |
816 | } | |
817 | init_blocks(s, s->frame_blocks, s->encbuffer, s->databuffer); | |
818 | init_blocks(s, s->key_blocks, s->keybuffer, 0); | |
819 | ||
820 | av_fast_malloc(&s->blockbuffer, &s->blockbuffer_size, block_width * block_height * 6); | |
821 | if (!s->blockbuffer) { | |
822 | av_log(s->avctx, AV_LOG_ERROR, "Could not allocate block buffer.\n"); | |
823 | return AVERROR(ENOMEM); | |
824 | } | |
825 | } | |
826 | ||
827 | s->use15_7 = optimum_use15_7(s); | |
828 | if (s->use15_7) { | |
829 | if ((s->use_custom_palette && s->palette_type != 1) || update_palette) { | |
830 | res = generate_optimum_palette(&s->palette, image, s->image_width, s->image_height, stride); | |
831 | if (res) | |
832 | return res; | |
833 | s->palette_type = 1; | |
834 | av_log(s->avctx, AV_LOG_DEBUG, "Generated optimum palette\n"); | |
835 | } else if (!s->use_custom_palette && s->palette_type != 0) { | |
836 | res = generate_default_palette(&s->palette); | |
837 | if (res) | |
838 | return res; | |
839 | s->palette_type = 0; | |
840 | av_log(s->avctx, AV_LOG_DEBUG, "Generated default palette\n"); | |
841 | } | |
842 | } | |
843 | ||
844 | ||
845 | reset_stats(s); | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | static int flashsv2_encode_frame(AVCodecContext *avctx, AVPacket *pkt, | |
851 | const AVFrame *p, int *got_packet) | |
852 | { | |
853 | FlashSV2Context *const s = avctx->priv_data; | |
854 | int res; | |
855 | int keyframe = 0; | |
856 | ||
857 | if ((res = ff_alloc_packet2(avctx, pkt, s->frame_size + FF_MIN_BUFFER_SIZE)) < 0) | |
858 | return res; | |
859 | ||
860 | /* First frame needs to be a keyframe */ | |
861 | if (avctx->frame_number == 0) | |
862 | keyframe = 1; | |
863 | ||
864 | /* Check the placement of keyframes */ | |
865 | if (avctx->gop_size > 0) { | |
866 | if (avctx->frame_number >= s->last_key_frame + avctx->gop_size) | |
867 | keyframe = 1; | |
868 | } | |
869 | ||
870 | if (!keyframe | |
871 | && avctx->frame_number > s->last_key_frame + avctx->keyint_min) { | |
872 | recommend_keyframe(s, &keyframe); | |
873 | if (keyframe) | |
874 | av_log(avctx, AV_LOG_DEBUG, "Recommending key frame at frame %d\n", avctx->frame_number); | |
875 | } | |
876 | ||
877 | if (keyframe) { | |
878 | res = reconfigure_at_keyframe(s, p->data[0], p->linesize[0]); | |
879 | if (res) | |
880 | return res; | |
881 | } | |
882 | ||
883 | if (s->use15_7) | |
884 | s->dist = optimum_dist(s); | |
885 | ||
886 | res = write_bitstream(s, p->data[0], p->linesize[0], pkt->data, pkt->size, keyframe); | |
887 | ||
888 | if (keyframe) { | |
889 | new_key_frame(s); | |
890 | s->last_key_frame = avctx->frame_number; | |
891 | pkt->flags |= AV_PKT_FLAG_KEY; | |
892 | av_log(avctx, AV_LOG_DEBUG, "Inserting key frame at frame %d\n", avctx->frame_number); | |
893 | } | |
894 | ||
895 | pkt->size = res; | |
896 | *got_packet = 1; | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
901 | static av_cold int flashsv2_encode_end(AVCodecContext * avctx) | |
902 | { | |
903 | FlashSV2Context *s = avctx->priv_data; | |
904 | ||
905 | cleanup(s); | |
906 | ||
907 | return 0; | |
908 | } | |
909 | ||
910 | AVCodec ff_flashsv2_encoder = { | |
911 | .name = "flashsv2", | |
912 | .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video Version 2"), | |
913 | .type = AVMEDIA_TYPE_VIDEO, | |
914 | .id = AV_CODEC_ID_FLASHSV2, | |
915 | .priv_data_size = sizeof(FlashSV2Context), | |
916 | .init = flashsv2_encode_init, | |
917 | .encode2 = flashsv2_encode_frame, | |
918 | .close = flashsv2_encode_end, | |
919 | .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE }, | |
920 | }; |