FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/flashsv2enc.c
Date: 2025-10-31 17:51:11
Exec Total Coverage
Lines: 325 407 79.9%
Functions: 33 37 89.2%
Branches: 123 202 60.9%
Line Branch Exec Source
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 "libavutil/mem.h"
51 #include "avcodec.h"
52 #include "codec_internal.h"
53 #include "encode.h"
54 #include "put_bits.h"
55 #include "zlib_wrapper.h"
56
57 #define HAS_IFRAME_IMAGE 0x02
58 #define HAS_PALLET_INFO 0x01
59
60 #define COLORSPACE_BGR 0x00
61 #define COLORSPACE_15_7 0x10
62 #define HAS_DIFF_BLOCKS 0x04
63 #define ZLIB_PRIME_COMPRESS_CURRENT 0x02
64 #define ZLIB_PRIME_COMPRESS_PREVIOUS 0x01
65
66 // Disables experimental "smart" parameter-choosing code, as well as the statistics that it depends on.
67 // At the moment, the "smart" code is a great example of how the parameters *shouldn't* be chosen.
68 #define FLASHSV2_DUMB
69
70 typedef struct Block {
71 uint8_t *enc;
72 uint8_t *sl_begin, *sl_end;
73 int enc_size;
74 uint8_t *data;
75 unsigned long data_size;
76
77 uint8_t start, len;
78 uint8_t dirty;
79 uint8_t col, row, width, height;
80 uint8_t flags;
81 } Block;
82
83 typedef struct Palette {
84 unsigned colors[128];
85 uint8_t index[1 << 15];
86 } Palette;
87
88 typedef struct FlashSV2Context {
89 AVCodecContext *avctx;
90 uint8_t *current_frame;
91 uint8_t *key_frame;
92 uint8_t *encbuffer;
93 uint8_t *keybuffer;
94 uint8_t *databuffer;
95
96 uint8_t *blockbuffer;
97 int blockbuffer_size;
98
99 Block *frame_blocks;
100 Block *key_blocks;
101 int frame_size;
102 int blocks_size;
103
104 int use15_7, dist, comp;
105
106 int rows, cols;
107
108 int64_t last_key_frame;
109
110 int image_width, image_height;
111 int block_width, block_height;
112 uint8_t flags;
113 uint8_t use_custom_palette;
114 uint8_t palette_type; ///< 0=>default, 1=>custom - changed when palette regenerated.
115 Palette palette;
116 FFZStream zstream;
117 #ifndef FLASHSV2_DUMB
118 double tot_blocks; ///< blocks encoded since last keyframe
119 double diff_blocks; ///< blocks that were different since last keyframe
120 double tot_lines; ///< total scanlines in image since last keyframe
121 double diff_lines; ///< scanlines that were different since last keyframe
122 double raw_size; ///< size of raw frames since last keyframe
123 double comp_size; ///< size of compressed data since last keyframe
124 double uncomp_size; ///< size of uncompressed data since last keyframe
125
126 double total_bits; ///< total bits written to stream so far
127 #endif
128 } FlashSV2Context;
129
130 4 static av_cold void cleanup(FlashSV2Context * s)
131 {
132 4 av_freep(&s->encbuffer);
133 4 av_freep(&s->keybuffer);
134 4 av_freep(&s->databuffer);
135 4 av_freep(&s->blockbuffer);
136 4 av_freep(&s->current_frame);
137 4 av_freep(&s->key_frame);
138
139 4 av_freep(&s->frame_blocks);
140 4 av_freep(&s->key_blocks);
141 4 ff_deflate_end(&s->zstream);
142 4 }
143
144 8 static void init_blocks(FlashSV2Context * s, Block * blocks,
145 uint8_t * encbuf, uint8_t * databuf)
146 {
147 int row, col;
148 Block *b;
149 8 memset(blocks, 0, s->cols * s->rows * sizeof(*blocks));
150
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 46 for (col = 0; col < s->cols; col++) {
151
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 220 for (row = 0; row < s->rows; row++) {
152 182 b = blocks + (col + row * s->cols);
153
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 182 b->width = (col < s->cols - 1) ?
154 150 s->block_width :
155 32 s->image_width - col * s->block_width;
156
157
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 182 b->height = (row < s->rows - 1) ?
158 144 s->block_height :
159 38 s->image_height - row * s->block_height;
160
161 182 b->row = row;
162 182 b->col = col;
163 182 b->enc = encbuf;
164 182 b->data = databuf;
165 182 encbuf += b->width * b->height * 3;
166
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 182 databuf = databuf ? databuf + b->width * b->height * 6 : NULL;
167 }
168 }
169 8 }
170
171 24 static void reset_stats(FlashSV2Context * s)
172 {
173 #ifndef FLASHSV2_DUMB
174 s->diff_blocks = 0.1;
175 s->tot_blocks = 1;
176 s->diff_lines = 0.1;
177 s->tot_lines = 1;
178 s->raw_size = s->comp_size = s->uncomp_size = 10;
179 #endif
180 24 }
181
182 4 static int update_block_dimensions(FlashSV2Context *s, int block_width, int block_height)
183 {
184 4 s->block_width = block_width;
185 4 s->block_height = block_height;
186 4 s->rows = (s->image_height + s->block_height - 1) / s->block_height;
187 4 s->cols = (s->image_width + s->block_width - 1) / s->block_width;
188
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 4 if (s->rows * s->cols > s->blocks_size / sizeof(Block)) {
189 4 s->frame_blocks = av_realloc_array(s->frame_blocks, s->rows, s->cols * sizeof(Block));
190 4 s->key_blocks = av_realloc_array(s->key_blocks, s->cols, s->rows * sizeof(Block));
191
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 4 if (!s->frame_blocks || !s->key_blocks) {
192 ✗ av_log(s->avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
193 ✗ return AVERROR(ENOMEM);
194 }
195 4 s->blocks_size = s->rows * s->cols * sizeof(Block);
196 }
197 4 init_blocks(s, s->frame_blocks, s->encbuffer, s->databuffer);
198 4 init_blocks(s, s->key_blocks, s->keybuffer, 0);
199
200 4 av_fast_malloc(&s->blockbuffer, &s->blockbuffer_size, block_width * block_height * 6);
201
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 4 if (!s->blockbuffer) {
202 ✗ av_log(s->avctx, AV_LOG_ERROR, "Could not allocate block buffer.\n");
203 ✗ return AVERROR(ENOMEM);
204 }
205 4 return 0;
206 }
207
208
209 4 static av_cold int flashsv2_encode_init(AVCodecContext * avctx)
210 {
211 4 FlashSV2Context *s = avctx->priv_data;
212 int ret;
213
214 4 s->avctx = avctx;
215
216 4 s->comp = avctx->compression_level;
217
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 4 if (s->comp == -1)
218 ✗ s->comp = 9;
219
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 4 if (s->comp < 0 || s->comp > 9) {
220 ✗ av_log(avctx, AV_LOG_ERROR,
221 "Compression level should be 0-9, not %d\n", s->comp);
222 ✗ return AVERROR(EINVAL);
223 }
224
225
226
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 4 if ((avctx->width > 4095) || (avctx->height > 4095)) {
227 ✗ av_log(avctx, AV_LOG_ERROR,
228 "Input dimensions too large, input must be max 4095x4095 !\n");
229 ✗ return AVERROR(EINVAL);
230 }
231
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 4 if ((avctx->width < 16) || (avctx->height < 16)) {
232 ✗ av_log(avctx, AV_LOG_ERROR,
233 "Input dimensions too small, input must be at least 16x16 !\n");
234 ✗ return AVERROR(EINVAL);
235 }
236
237
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 4 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
238 ✗ return ret;
239
240 4 ret = ff_deflate_init(&s->zstream, s->comp, avctx);
241
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 4 if (ret < 0)
242 ✗ return ret;
243 4 s->last_key_frame = 0;
244
245 4 s->image_width = avctx->width;
246 4 s->image_height = avctx->height;
247
248 4 s->frame_size = s->image_width * s->image_height * 3;
249
250 4 s->encbuffer = av_mallocz(s->frame_size);
251 4 s->keybuffer = av_mallocz(s->frame_size);
252 4 s->databuffer = av_mallocz(s->frame_size * 6);
253 4 s->current_frame = av_mallocz(s->frame_size);
254 4 s->key_frame = av_mallocz(s->frame_size);
255
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 4 if (!s->encbuffer || !s->keybuffer || !s->databuffer
256
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 4 || !s->current_frame || !s->key_frame) {
257 ✗ av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
258 ✗ return AVERROR(ENOMEM);
259 }
260
261 4 reset_stats(s);
262 #ifndef FLASHSV2_DUMB
263 s->total_bits = 1;
264 #endif
265
266 4 s->use_custom_palette = 0;
267 4 s->palette_type = -1; // so that the palette will be generated in reconfigure_at_keyframe
268
269 4 return update_block_dimensions(s, 64, 64);
270 }
271
272 20 static int new_key_frame(FlashSV2Context * s)
273 {
274 int i;
275 20 memcpy(s->key_blocks, s->frame_blocks, s->blocks_size);
276 20 memcpy(s->key_frame, s->current_frame, s->frame_size);
277
278
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 475 for (i = 0; i < s->rows * s->cols; i++) {
279 455 s->key_blocks[i].enc += (s->keybuffer - s->encbuffer);
280 455 s->key_blocks[i].sl_begin = 0;
281 455 s->key_blocks[i].sl_end = 0;
282 455 s->key_blocks[i].data = 0;
283 }
284 20 memcpy(s->keybuffer, s->encbuffer, s->frame_size);
285
286 20 return 0;
287 }
288
289 ✗ static int write_palette(FlashSV2Context * s, uint8_t * buf, int buf_size)
290 {
291 //this isn't implemented yet! Default palette only!
292 ✗ return -1;
293 }
294
295 200 static int write_header(FlashSV2Context * s, uint8_t * buf, int buf_size)
296 {
297 PutBitContext pb;
298 int buf_pos, len;
299
300
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 200 if (buf_size < 5)
301 ✗ return -1;
302
303 200 init_put_bits(&pb, buf, buf_size);
304
305 200 put_bits(&pb, 4, (s->block_width >> 4) - 1);
306 200 put_bits(&pb, 12, s->image_width);
307 200 put_bits(&pb, 4, (s->block_height >> 4) - 1);
308 200 put_bits(&pb, 12, s->image_height);
309
310 200 flush_put_bits(&pb);
311 200 buf_pos = 4;
312
313 200 buf[buf_pos++] = s->flags;
314
315
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 200 if (s->flags & HAS_PALLET_INFO) {
316 ✗ len = write_palette(s, buf + buf_pos, buf_size - buf_pos);
317 ✗ if (len < 0)
318 ✗ return -1;
319 ✗ buf_pos += len;
320 }
321
322 200 return buf_pos;
323 }
324
325 4550 static int write_block(Block * b, uint8_t * buf, int buf_size)
326 {
327 4550 int buf_pos = 0;
328 4550 unsigned block_size = b->data_size;
329
330
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 4550 if (b->flags & HAS_DIFF_BLOCKS)
331 ✗ block_size += 2;
332
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 4550 if (b->flags & ZLIB_PRIME_COMPRESS_CURRENT)
333 ✗ block_size += 2;
334
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 4550 if (block_size > 0)
335 4550 block_size += 1;
336
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 4550 if (buf_size < block_size + 2)
337 ✗ return -1;
338
339 4550 buf[buf_pos++] = block_size >> 8;
340 4550 buf[buf_pos++] = block_size;
341
342
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 4550 if (block_size == 0)
343 ✗ return buf_pos;
344
345 4550 buf[buf_pos++] = b->flags;
346
347
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 4550 if (b->flags & HAS_DIFF_BLOCKS) {
348 ✗ buf[buf_pos++] = (b->start);
349 ✗ buf[buf_pos++] = (b->len);
350 }
351
352
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 4550 if (b->flags & ZLIB_PRIME_COMPRESS_CURRENT) {
353 //This feature of the format is poorly understood, and as of now, unused.
354 ✗ buf[buf_pos++] = (b->col);
355 ✗ buf[buf_pos++] = (b->row);
356 }
357
358 4550 memcpy(buf + buf_pos, b->data, b->data_size);
359
360 4550 buf_pos += b->data_size;
361
362 4550 return buf_pos;
363 }
364
365 4550 static int encode_zlib(Block *b, uint8_t *buf, unsigned long *buf_size,
366 z_stream *zstream)
367 {
368 int res;
369
370
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 4550 if (deflateReset(zstream) != Z_OK)
371 ✗ return AVERROR_EXTERNAL;
372 4550 zstream->next_out = buf;
373 4550 zstream->avail_out = *buf_size;
374 4550 zstream->next_in = b->sl_begin;
375 4550 zstream->avail_in = b->sl_end - b->sl_begin;
376 4550 res = deflate(zstream, Z_FINISH);
377
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 4550 if (res != Z_STREAM_END)
378 ✗ return AVERROR_EXTERNAL;
379 4550 *buf_size -= zstream->avail_out;
380 4550 return 0;
381 }
382
383 4095 static int encode_zlibprime(Block * b, Block * prime, uint8_t * buf,
384 int *buf_size, z_stream *zstream)
385 {
386 int res;
387
388
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 4095 if (deflateReset(zstream) != Z_OK)
389 ✗ return AVERROR_EXTERNAL;
390 4095 zstream->next_in = prime->enc;
391 4095 zstream->avail_in = prime->enc_size;
392
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 8190 while (zstream->avail_in > 0) {
393 4095 zstream->next_out = buf;
394 4095 zstream->avail_out = *buf_size;
395 4095 res = deflate(zstream, Z_SYNC_FLUSH);
396
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 4095 if (res < 0)
397 ✗ return -1;
398 }
399
400 4095 zstream->next_in = b->sl_begin;
401 4095 zstream->avail_in = b->sl_end - b->sl_begin;
402 4095 zstream->next_out = buf;
403 4095 zstream->avail_out = *buf_size;
404 4095 res = deflate(zstream, Z_FINISH);
405 4095 *buf_size -= zstream->avail_out;
406
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 4095 if (res != Z_STREAM_END)
407 ✗ return -1;
408 4095 return 0;
409 }
410
411 ✗ static int encode_bgr(Block * b, const uint8_t * src, int stride)
412 {
413 int i;
414 ✗ uint8_t *ptr = b->enc;
415 ✗ for (i = 0; i < b->start; i++)
416 ✗ memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3);
417 ✗ b->sl_begin = ptr + i * b->width * 3;
418 ✗ for (; i < b->start + b->len; i++)
419 ✗ memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3);
420 ✗ b->sl_end = ptr + i * b->width * 3;
421 ✗ for (; i < b->height; i++)
422 ✗ memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3);
423 ✗ b->enc_size = ptr + i * b->width * 3 - b->enc;
424 ✗ return b->enc_size;
425 }
426
427 15264200 static inline unsigned pixel_color15(const uint8_t * src)
428 {
429 15264200 return (src[0] >> 3) | ((src[1] & 0xf8) << 2) | ((src[2] & 0xf8) << 7);
430 }
431
432 47305616 static inline unsigned int chroma_diff(unsigned int c1, unsigned int c2)
433 {
434 #define ABSDIFF(a,b) (abs((int)(a)-(int)(b)))
435
436 47305616 unsigned int t1 = (c1 & 0x000000ff) + ((c1 & 0x0000ff00) >> 8) + ((c1 & 0x00ff0000) >> 16);
437 47305616 unsigned int t2 = (c2 & 0x000000ff) + ((c2 & 0x0000ff00) >> 8) + ((c2 & 0x00ff0000) >> 16);
438
439 47305616 return ABSDIFF(t1, t2) + ABSDIFF(c1 & 0x000000ff, c2 & 0x000000ff) +
440 94611232 ABSDIFF((c1 & 0x0000ff00) >> 8 , (c2 & 0x0000ff00) >> 8) +
441 47305616 ABSDIFF((c1 & 0x00ff0000) >> 16, (c2 & 0x00ff0000) >> 16);
442 }
443
444 15264200 static inline int pixel_color7_fast(Palette * palette, unsigned c15)
445 {
446 15264200 return palette->index[c15];
447 }
448
449 131072 static int pixel_color7_slow(Palette * palette, unsigned color)
450 {
451 131072 int i, min = 0x7fffffff;
452 131072 int minc = -1;
453
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 16908288 for (i = 0; i < 128; i++) {
454 16777216 int c1 = palette->colors[i];
455 16777216 int diff = chroma_diff(c1, color);
456
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 16777216 if (diff < min) {
457 813324 min = diff;
458 813324 minc = i;
459 }
460 }
461 131072 return minc;
462 }
463
464 15264200 static inline unsigned pixel_bgr(const uint8_t * src)
465 {
466 15264200 return (src[0]) | (src[1] << 8) | (src[2] << 16);
467 }
468
469 15264200 static int write_pixel_15_7(Palette * palette, uint8_t * dest, const uint8_t * src,
470 int dist)
471 {
472 15264200 unsigned c15 = pixel_color15(src);
473 15264200 unsigned color = pixel_bgr(src);
474 15264200 int d15 = chroma_diff(color, color & 0x00f8f8f8);
475 15264200 int c7 = pixel_color7_fast(palette, c15);
476 15264200 int d7 = chroma_diff(color, palette->colors[c7]);
477
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 15264200 if (dist + d15 >= d7) {
478 3161177 dest[0] = c7;
479 3161177 return 1;
480 } else {
481 12103023 dest[0] = 0x80 | (c15 >> 8);
482 12103023 dest[1] = c15 & 0xff;
483 12103023 return 2;
484 }
485 }
486
487 4 static int update_palette_index(Palette * palette)
488 {
489 int r, g, b;
490 unsigned int bgr, c15, index;
491
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 132 for (r = 4; r < 256; r += 8) {
492
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 4224 for (g = 4; g < 256; g += 8) {
493
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 135168 for (b = 4; b < 256; b += 8) {
494 131072 bgr = b | (g << 8) | (r << 16);
495 131072 c15 = (b >> 3) | ((g & 0xf8) << 2) | ((r & 0xf8) << 7);
496 131072 index = pixel_color7_slow(palette, bgr);
497
498 131072 palette->index[c15] = index;
499 }
500 }
501 }
502 4 return 0;
503 }
504
505 static const unsigned int default_screen_video_v2_palette[128] = {
506 0x00000000, 0x00333333, 0x00666666, 0x00999999, 0x00CCCCCC, 0x00FFFFFF,
507 0x00330000, 0x00660000, 0x00990000, 0x00CC0000, 0x00FF0000, 0x00003300,
508 0x00006600, 0x00009900, 0x0000CC00, 0x0000FF00, 0x00000033, 0x00000066,
509 0x00000099, 0x000000CC, 0x000000FF, 0x00333300, 0x00666600, 0x00999900,
510 0x00CCCC00, 0x00FFFF00, 0x00003333, 0x00006666, 0x00009999, 0x0000CCCC,
511 0x0000FFFF, 0x00330033, 0x00660066, 0x00990099, 0x00CC00CC, 0x00FF00FF,
512 0x00FFFF33, 0x00FFFF66, 0x00FFFF99, 0x00FFFFCC, 0x00FF33FF, 0x00FF66FF,
513 0x00FF99FF, 0x00FFCCFF, 0x0033FFFF, 0x0066FFFF, 0x0099FFFF, 0x00CCFFFF,
514 0x00CCCC33, 0x00CCCC66, 0x00CCCC99, 0x00CCCCFF, 0x00CC33CC, 0x00CC66CC,
515 0x00CC99CC, 0x00CCFFCC, 0x0033CCCC, 0x0066CCCC, 0x0099CCCC, 0x00FFCCCC,
516 0x00999933, 0x00999966, 0x009999CC, 0x009999FF, 0x00993399, 0x00996699,
517 0x0099CC99, 0x0099FF99, 0x00339999, 0x00669999, 0x00CC9999, 0x00FF9999,
518 0x00666633, 0x00666699, 0x006666CC, 0x006666FF, 0x00663366, 0x00669966,
519 0x0066CC66, 0x0066FF66, 0x00336666, 0x00996666, 0x00CC6666, 0x00FF6666,
520 0x00333366, 0x00333399, 0x003333CC, 0x003333FF, 0x00336633, 0x00339933,
521 0x0033CC33, 0x0033FF33, 0x00663333, 0x00993333, 0x00CC3333, 0x00FF3333,
522 0x00003366, 0x00336600, 0x00660033, 0x00006633, 0x00330066, 0x00663300,
523 0x00336699, 0x00669933, 0x00993366, 0x00339966, 0x00663399, 0x00996633,
524 0x006699CC, 0x0099CC66, 0x00CC6699, 0x0066CC99, 0x009966CC, 0x00CC9966,
525 0x0099CCFF, 0x00CCFF99, 0x00FF99CC, 0x0099FFCC, 0x00CC99FF, 0x00FFCC99,
526 0x00111111, 0x00222222, 0x00444444, 0x00555555, 0x00AAAAAA, 0x00BBBBBB,
527 0x00DDDDDD, 0x00EEEEEE
528 };
529
530 4 static int generate_default_palette(Palette * palette)
531 {
532 4 memcpy(palette->colors, default_screen_video_v2_palette,
533 sizeof(default_screen_video_v2_palette));
534
535 4 return update_palette_index(palette);
536 }
537
538 ✗ static int generate_optimum_palette(Palette * palette, const uint8_t * image,
539 int width, int height, int stride)
540 {
541 //this isn't implemented yet! Default palette only!
542 ✗ return -1;
543 }
544
545 260900 static inline int encode_15_7_sl(Palette * palette, uint8_t * dest,
546 const uint8_t * src, int width, int dist)
547 {
548 260900 int len = 0, x;
549
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 15525100 for (x = 0; x < width; x++) {
550 15264200 len += write_pixel_15_7(palette, dest + len, src + 3 * x, dist);
551 }
552 260900 return len;
553 }
554
555 4550 static int encode_15_7(Palette * palette, Block * b, const uint8_t * src,
556 int stride, int dist)
557 {
558 int i;
559 4550 uint8_t *ptr = b->enc;
560
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 4550 for (i = 0; i < b->start; i++)
561 ✗ ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist);
562 4550 b->sl_begin = ptr;
563
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 265450 for (; i < b->start + b->len; i++)
564 260900 ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist);
565 4550 b->sl_end = ptr;
566
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 4550 for (; i < b->height; i++)
567 ✗ ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist);
568 4550 b->enc_size = ptr - b->enc;
569 4550 return b->enc_size;
570 }
571
572 4550 static int encode_block(FlashSV2Context *s, Palette * palette, Block * b,
573 Block *prev, const uint8_t *src, int stride,
574 int dist, int keyframe)
575 {
576 4550 unsigned buf_size = b->width * b->height * 6;
577 4550 uint8_t *buf = s->blockbuffer;
578 int res;
579
580
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 4550 if (b->flags & COLORSPACE_15_7) {
581 4550 encode_15_7(palette, b, src, stride, dist);
582 } else {
583 ✗ encode_bgr(b, src, stride);
584 }
585
586
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 4550 if (b->len > 0) {
587 4550 b->data_size = buf_size;
588 4550 res = encode_zlib(b, b->data, &b->data_size, &s->zstream.zstream);
589
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 4550 if (res)
590 ✗ return res;
591
592
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 4550 if (!keyframe) {
593 4095 res = encode_zlibprime(b, prev, buf, &buf_size, &s->zstream.zstream);
594
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 4095 if (res)
595 ✗ return res;
596
597
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 4095 if (buf_size < b->data_size) {
598 4095 b->data_size = buf_size;
599 4095 memcpy(b->data, buf, buf_size);
600 4095 b->flags |= ZLIB_PRIME_COMPRESS_PREVIOUS;
601 }
602 }
603 } else {
604 ✗ b->data_size = 0;
605 }
606 4550 return 0;
607 }
608
609 260900 static int compare_sl(FlashSV2Context * s, Block * b, const uint8_t * src,
610 uint8_t * frame, uint8_t * key, int y, int keyframe)
611 {
612
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 260900 if (memcmp(src, frame, b->width * 3) != 0) {
613 260900 b->dirty = 1;
614 260900 memcpy(frame, src, b->width * 3);
615 #ifndef FLASHSV2_DUMB
616 s->diff_lines++;
617 #endif
618 }
619
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 260900 if (memcmp(src, key, b->width * 3) != 0) {
620
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 260900 if (b->len == 0)
621 4550 b->start = y;
622 260900 b->len = y + 1 - b->start;
623 }
624 260900 return 0;
625 }
626
627 200 static int mark_all_blocks(FlashSV2Context * s, const uint8_t * src, int stride,
628 int keyframe)
629 {
630 int sl, rsl, col, pos, possl;
631 Block *b;
632
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 45100 for (sl = s->image_height - 1; sl >= 0; sl--) {
633
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 305800 for (col = 0; col < s->cols; col++) {
634 260900 rsl = s->image_height - sl - 1;
635 260900 b = s->frame_blocks + col + rsl / s->block_height * s->cols;
636 260900 possl = stride * sl + col * s->block_width * 3;
637 260900 pos = s->image_width * rsl * 3 + col * s->block_width * 3;
638 260900 compare_sl(s, b, src + possl, s->current_frame + pos,
639 260900 s->key_frame + pos, rsl % s->block_height, keyframe);
640 }
641 }
642 #ifndef FLASHSV2_DUMB
643 s->tot_lines += s->image_height * s->cols;
644 #endif
645 200 return 0;
646 }
647
648 200 static int encode_all_blocks(FlashSV2Context * s, int keyframe)
649 {
650 int row, col, res;
651 uint8_t *data;
652 Block *b, *prev;
653
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 1000 for (row = 0; row < s->rows; row++) {
654
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 5350 for (col = 0; col < s->cols; col++) {
655 4550 b = s->frame_blocks + (row * s->cols + col);
656 4550 prev = s->key_blocks + (row * s->cols + col);
657
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 4550 b->flags = s->use15_7 ? COLORSPACE_15_7 : 0;
658
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 4550 if (keyframe) {
659 455 b->start = 0;
660 455 b->len = b->height;
661
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 4095 } else if (!b->dirty) {
662 ✗ b->start = 0;
663 ✗ b->len = 0;
664 ✗ b->data_size = 0;
665 ✗ continue;
666
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 4095 } else if (b->start != 0 || b->len != b->height) {
667 ✗ b->flags |= HAS_DIFF_BLOCKS;
668 }
669 4550 data = s->current_frame + s->image_width * 3 * s->block_height * row + s->block_width * col * 3;
670 4550 res = encode_block(s, &s->palette, b, prev, data,
671 4550 s->image_width * 3, s->dist, keyframe);
672 #ifndef FLASHSV2_DUMB
673 if (b->dirty)
674 s->diff_blocks++;
675 s->comp_size += b->data_size;
676 s->uncomp_size += b->enc_size;
677 #endif
678
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 4550 if (res)
679 ✗ return res;
680 }
681 }
682 #ifndef FLASHSV2_DUMB
683 s->raw_size += s->image_width * s->image_height * 3;
684 s->tot_blocks += s->rows * s->cols;
685 #endif
686 200 return 0;
687 }
688
689 200 static int write_all_blocks(FlashSV2Context * s, uint8_t * buf,
690 int buf_size)
691 {
692 200 int row, col, buf_pos = 0, len;
693 Block *b;
694
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 1000 for (row = 0; row < s->rows; row++) {
695
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 5350 for (col = 0; col < s->cols; col++) {
696 4550 b = s->frame_blocks + row * s->cols + col;
697 4550 len = write_block(b, buf + buf_pos, buf_size - buf_pos);
698 4550 b->start = b->len = b->dirty = 0;
699
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 4550 if (len < 0)
700 ✗ return len;
701 4550 buf_pos += len;
702 }
703 }
704 200 return buf_pos;
705 }
706
707 200 static int write_bitstream(FlashSV2Context * s, const uint8_t * src, int stride,
708 uint8_t * buf, int buf_size, int keyframe)
709 {
710 int buf_pos, res;
711
712 200 res = mark_all_blocks(s, src, stride, keyframe);
713
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 200 if (res)
714 ✗ return res;
715 200 res = encode_all_blocks(s, keyframe);
716
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 200 if (res)
717 ✗ return res;
718
719 200 res = write_header(s, buf, buf_size);
720
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 200 if (res < 0) {
721 ✗ return res;
722 } else {
723 200 buf_pos = res;
724 }
725 200 res = write_all_blocks(s, buf + buf_pos, buf_size - buf_pos);
726
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 200 if (res < 0)
727 ✗ return res;
728 200 buf_pos += res;
729 #ifndef FLASHSV2_DUMB
730 s->total_bits += ((double) buf_pos) * 8.0;
731 #endif
732
733 200 return buf_pos;
734 }
735
736 ✗ static void recommend_keyframe(FlashSV2Context * s, int *keyframe)
737 {
738 #ifndef FLASHSV2_DUMB
739 double block_ratio, line_ratio, enc_ratio, comp_ratio, data_ratio;
740 if (s->avctx->gop_size > 0) {
741 block_ratio = s->diff_blocks / s->tot_blocks;
742 line_ratio = s->diff_lines / s->tot_lines;
743 enc_ratio = s->uncomp_size / s->raw_size;
744 comp_ratio = s->comp_size / s->uncomp_size;
745 data_ratio = s->comp_size / s->raw_size;
746
747 if ((block_ratio >= 0.5 && line_ratio / block_ratio <= 0.5) || line_ratio >= 0.95) {
748 *keyframe = 1;
749 return;
750 }
751 }
752 #else
753 ✗ return;
754 #endif
755 }
756
757 #ifndef FLASHSV2_DUMB
758 static const double block_size_fraction = 1.0 / 300;
759 static const double use15_7_threshold = 8192;
760 static const double color15_7_factor = 100;
761 #endif
762 20 static int optimum_block_width(FlashSV2Context * s)
763 {
764 #ifndef FLASHSV2_DUMB
765 double save = (1-pow(s->diff_lines/s->diff_blocks/s->block_height, 0.5)) * s->comp_size/s->tot_blocks;
766 double width = block_size_fraction * sqrt(0.5 * save * s->rows * s->cols) * s->image_width;
767 int pwidth = ((int) width);
768 return FFCLIP(pwidth & ~15, 256, 16);
769 #else
770 20 return 64;
771 #endif
772 }
773
774 20 static int optimum_block_height(FlashSV2Context * s)
775 {
776 #ifndef FLASHSV2_DUMB
777 double save = (1-pow(s->diff_lines/s->diff_blocks/s->block_height, 0.5)) * s->comp_size/s->tot_blocks;
778 double height = block_size_fraction * sqrt(0.5 * save * s->rows * s->cols) * s->image_height;
779 int pheight = ((int) height);
780 return FFCLIP(pheight & ~15, 256, 16);
781 #else
782 20 return 64;
783 #endif
784 }
785
786 20 static int optimum_use15_7(FlashSV2Context * s)
787 {
788 #ifndef FLASHSV2_DUMB
789 double ideal = ((double)(s->avctx->bit_rate * s->avctx->time_base.den)) /
790 ((double) s->avctx->time_base.num) * s->avctx->frame_num;
791 if (ideal + use15_7_threshold < s->total_bits) {
792 return 1;
793 } else {
794 return 0;
795 }
796 #else
797 20 return s->avctx->global_quality == 0;
798 #endif
799 }
800
801 200 static int optimum_dist(FlashSV2Context * s)
802 {
803 #ifndef FLASHSV2_DUMB
804 double ideal =
805 s->avctx->bit_rate * s->avctx->time_base.den;
806 int dist = pow((s->total_bits / ideal) * color15_7_factor, 3);
807 av_log(s->avctx, AV_LOG_DEBUG, "dist: %d\n", dist);
808 return dist;
809 #else
810 200 return 15;
811 #endif
812 }
813
814
815 20 static int reconfigure_at_keyframe(FlashSV2Context * s, const uint8_t * image,
816 int stride)
817 {
818 20 int update_palette = 0;
819 int res;
820 20 int block_width = optimum_block_width (s);
821 20 int block_height = optimum_block_height(s);
822
823
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 20 if (block_width != s->block_width || block_height != s->block_height) {
824 ✗ res = update_block_dimensions(s, block_width, block_height);
825 ✗ if (res < 0)
826 ✗ return res;
827 }
828
829 20 s->use15_7 = optimum_use15_7(s);
830
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 20 if (s->use15_7) {
831
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 20 if ((s->use_custom_palette && s->palette_type != 1) || update_palette) {
832 ✗ res = generate_optimum_palette(&s->palette, image, s->image_width, s->image_height, stride);
833 ✗ if (res)
834 ✗ return res;
835 ✗ s->palette_type = 1;
836 ✗ av_log(s->avctx, AV_LOG_DEBUG, "Generated optimum palette\n");
837
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 20 } else if (!s->use_custom_palette && s->palette_type != 0) {
838 4 res = generate_default_palette(&s->palette);
839
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 4 if (res)
840 ✗ return res;
841 4 s->palette_type = 0;
842 4 av_log(s->avctx, AV_LOG_DEBUG, "Generated default palette\n");
843 }
844 }
845
846
847 20 reset_stats(s);
848
849 20 return 0;
850 }
851
852 200 static int flashsv2_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
853 const AVFrame *p, int *got_packet)
854 {
855 200 FlashSV2Context *const s = avctx->priv_data;
856 int res;
857 200 int keyframe = 0;
858
859
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 200 if ((res = ff_alloc_packet(avctx, pkt, s->frame_size + FF_INPUT_BUFFER_MIN_SIZE)) < 0)
860 ✗ return res;
861
862 /* First frame needs to be a keyframe */
863
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 200 if (avctx->frame_num == 0)
864 4 keyframe = 1;
865
866 /* Check the placement of keyframes */
867
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 200 if (avctx->gop_size > 0) {
868
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 200 if (avctx->frame_num >= s->last_key_frame + avctx->gop_size)
869 16 keyframe = 1;
870 }
871
872
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 200 if (!keyframe
873
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 180 && avctx->frame_num > s->last_key_frame + avctx->keyint_min) {
874 ✗ recommend_keyframe(s, &keyframe);
875 ✗ if (keyframe)
876 ✗ av_log(avctx, AV_LOG_DEBUG, "Recommending key frame at frame %"PRId64"\n", avctx->frame_num);
877 }
878
879
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 200 if (keyframe) {
880 20 res = reconfigure_at_keyframe(s, p->data[0], p->linesize[0]);
881
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 20 if (res)
882 ✗ return res;
883 }
884
885
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 200 if (s->use15_7)
886 200 s->dist = optimum_dist(s);
887
888 200 res = write_bitstream(s, p->data[0], p->linesize[0], pkt->data, pkt->size, keyframe);
889
890
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 200 if (keyframe) {
891 20 new_key_frame(s);
892 20 s->last_key_frame = avctx->frame_num;
893 20 pkt->flags |= AV_PKT_FLAG_KEY;
894 20 av_log(avctx, AV_LOG_DEBUG, "Inserting key frame at frame %"PRId64"\n", avctx->frame_num);
895 }
896
897 200 pkt->size = res;
898 200 *got_packet = 1;
899
900 200 return 0;
901 }
902
903 4 static av_cold int flashsv2_encode_end(AVCodecContext * avctx)
904 {
905 4 FlashSV2Context *s = avctx->priv_data;
906
907 4 cleanup(s);
908
909 4 return 0;
910 }
911
912 const FFCodec ff_flashsv2_encoder = {
913 .p.name = "flashsv2",
914 CODEC_LONG_NAME("Flash Screen Video Version 2"),
915 .p.type = AVMEDIA_TYPE_VIDEO,
916 .p.id = AV_CODEC_ID_FLASHSV2,
917 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
918 .priv_data_size = sizeof(FlashSV2Context),
919 .init = flashsv2_encode_init,
920 FF_CODEC_ENCODE_CB(flashsv2_encode_frame),
921 .close = flashsv2_encode_end,
922 CODEC_PIXFMTS(AV_PIX_FMT_BGR24),
923 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
924 };
925