2 * Flash Screen Video Version 2 encoder
3 * Copyright (C) 2009 Joshua Warner
5 * This file is part of FFmpeg.
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.
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.
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
24 * Flash Screen Video Version 2 encoder
25 * @author Joshua Warner
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.
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.
49 #include "libavutil/imgutils.h"
53 #include "bytestream.h"
55 #define HAS_IFRAME_IMAGE 0x02
56 #define HAS_PALLET_INFO 0x01
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
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.
68 typedef struct Block {
70 uint8_t *sl_begin, *sl_end;
73 unsigned long data_size;
77 uint8_t col, row, width, height;
81 typedef struct Palette {
83 uint8_t index[1 << 15];
86 typedef struct FlashSV2Context {
87 AVCodecContext *avctx;
88 uint8_t *current_frame;
102 int use15_7, dist, comp;
108 int image_width, image_height;
109 int block_width, block_height;
111 uint8_t use_custom_palette;
112 uint8_t palette_type; ///< 0=>default, 1=>custom - changed when palette regenerated.
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
123 double total_bits; ///< total bits written to stream so far
127 static av_cold void cleanup(FlashSV2Context * s)
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);
136 av_freep(&s->frame_blocks);
137 av_freep(&s->key_blocks);
140 static void init_blocks(FlashSV2Context * s, Block * blocks,
141 uint8_t * encbuf, uint8_t * databuf)
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) ?
150 s->image_width - col * s->block_width;
152 b->height = (row < s->rows - 1) ?
154 s->image_height - row * s->block_height;
160 encbuf += b->width * b->height * 3;
161 databuf += !databuf ? 0 : b->width * b->height * 6;
166 static void reset_stats(FlashSV2Context * s)
168 #ifndef FLASHSV2_DUMB
169 s->diff_blocks = 0.1;
173 s->raw_size = s->comp_size = s->uncomp_size = 10;
177 static av_cold int flashsv2_encode_init(AVCodecContext * avctx)
179 FlashSV2Context *s = avctx->priv_data;
183 s->comp = avctx->compression_level;
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);
193 if ((avctx->width > 4095) || (avctx->height > 4095)) {
194 av_log(avctx, AV_LOG_ERROR,
195 "Input dimensions too large, input must be max 4095x4095 !\n");
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");
204 if (av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0)
208 s->last_key_frame = 0;
210 s->image_width = avctx->width;
211 s->image_height = avctx->height;
213 s->block_width = (s->image_width / 12) & ~15;
214 s->block_height = (s->image_height / 12) & ~15;
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;
224 s->frame_size = s->image_width * s->image_height * 3;
225 s->blocks_size = s->rows * s->cols * sizeof(Block);
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);
235 s->blockbuffer = NULL;
236 s->blockbuffer_size = 0;
238 init_blocks(s, s->frame_blocks, s->encbuffer, s->databuffer);
239 init_blocks(s, s->key_blocks, s->keybuffer, 0);
241 #ifndef FLASHSV2_DUMB
245 s->use_custom_palette = 0;
246 s->palette_type = -1; // so that the palette will be generated in reconfigure_at_keyframe
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");
259 static int new_key_frame(FlashSV2Context * s)
262 memcpy(s->key_blocks, s->frame_blocks, s->blocks_size);
263 memcpy(s->key_frame, s->current_frame, s->frame_size);
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;
271 memcpy(s->keybuffer, s->encbuffer, s->frame_size);
276 static int write_palette(FlashSV2Context * s, uint8_t * buf, int buf_size)
278 //this isn't implemented yet! Default palette only!
282 static int write_header(FlashSV2Context * s, uint8_t * buf, int buf_size)
290 init_put_bits(&pb, buf, buf_size);
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);
300 buf[buf_pos++] = s->flags;
302 if (s->flags & HAS_PALLET_INFO) {
303 len = write_palette(s, buf + buf_pos, buf_size - buf_pos);
312 static int write_block(Block * b, uint8_t * buf, int buf_size)
315 unsigned block_size = b->data_size;
317 if (b->flags & HAS_DIFF_BLOCKS)
319 if (b->flags & ZLIB_PRIME_COMPRESS_CURRENT)
323 if (buf_size < block_size + 2)
326 buf[buf_pos++] = block_size >> 8;
327 buf[buf_pos++] = block_size;
332 buf[buf_pos++] = b->flags;
334 if (b->flags & HAS_DIFF_BLOCKS) {
335 buf[buf_pos++] = (b->start);
336 buf[buf_pos++] = (b->len);
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);
345 memcpy(buf + buf_pos, b->data, b->data_size);
347 buf_pos += b->data_size;
352 static int encode_zlib(Block * b, uint8_t * buf, unsigned long *buf_size, int comp)
354 int res = compress2(buf, buf_size, b->sl_begin, b->sl_end - b->sl_begin, comp);
355 return res == Z_OK ? 0 : -1;
358 static int encode_zlibprime(Block * b, Block * prime, uint8_t * buf,
359 int *buf_size, int comp)
366 res = deflateInit(&s, comp);
370 s.next_in = prime->enc;
371 s.avail_in = prime->enc_size;
372 while (s.avail_in > 0) {
374 s.avail_out = *buf_size;
375 res = deflate(&s, Z_SYNC_FLUSH);
380 s.next_in = b->sl_begin;
381 s.avail_in = b->sl_end - b->sl_begin;
383 s.avail_out = *buf_size;
384 res = deflate(&s, Z_FINISH);
386 *buf_size -= s.avail_out;
387 if (res != Z_STREAM_END)
392 static int encode_bgr(Block * b, const uint8_t * src, int stride)
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;
408 static inline unsigned pixel_color15(const uint8_t * src)
410 return (src[0] >> 3) | ((src[1] & 0xf8) << 2) | ((src[2] & 0xf8) << 7);
413 static inline unsigned int chroma_diff(unsigned int c1, unsigned int c2)
415 #define ABSDIFF(a,b) (abs((int)(a)-(int)(b)))
417 unsigned int t1 = (c1 & 0x000000ff) + ((c1 & 0x0000ff00) >> 8) + ((c1 & 0x00ff0000) >> 16);
418 unsigned int t2 = (c2 & 0x000000ff) + ((c2 & 0x0000ff00) >> 8) + ((c2 & 0x00ff0000) >> 16);
420 return ABSDIFF(t1, t2) + ABSDIFF(c1 & 0x000000ff, c2 & 0x000000ff) +
421 ABSDIFF((c1 & 0x0000ff00) >> 8 , (c2 & 0x0000ff00) >> 8) +
422 ABSDIFF((c1 & 0x00ff0000) >> 16, (c2 & 0x00ff0000) >> 16);
425 static inline int pixel_color7_fast(Palette * palette, unsigned c15)
427 return palette->index[c15];
430 static int pixel_color7_slow(Palette * palette, unsigned color)
432 int i, min = 0x7fffffff;
434 for (i = 0; i < 128; i++) {
435 int c1 = palette->colors[i];
436 int diff = chroma_diff(c1, color);
445 static inline unsigned pixel_bgr(const uint8_t * src)
447 return (src[0]) | (src[1] << 8) | (src[2] << 16);
450 static int write_pixel_15_7(Palette * palette, uint8_t * dest, const uint8_t * src,
453 unsigned c15 = pixel_color15(src);
454 unsigned color = pixel_bgr(src);
455 int d15 = chroma_diff(color, color & 0x00f8f8f8);
456 int c7 = pixel_color7_fast(palette, c15);
457 int d7 = chroma_diff(color, palette->colors[c7]);
458 if (dist + d15 >= d7) {
462 dest[0] = 0x80 | (c15 >> 8);
463 dest[1] = c15 & 0xff;
468 static int update_palette_index(Palette * palette)
471 unsigned int bgr, c15, index;
472 for (r = 4; r < 256; r += 8) {
473 for (g = 4; g < 256; g += 8) {
474 for (b = 4; b < 256; b += 8) {
475 bgr = b | (g << 8) | (r << 16);
476 c15 = (b >> 3) | ((g & 0xf8) << 2) | ((r & 0xf8) << 7);
477 index = pixel_color7_slow(palette, bgr);
479 palette->index[c15] = index;
486 static const unsigned int default_screen_video_v2_palette[128] = {
487 0x00000000, 0x00333333, 0x00666666, 0x00999999, 0x00CCCCCC, 0x00FFFFFF,
488 0x00330000, 0x00660000, 0x00990000, 0x00CC0000, 0x00FF0000, 0x00003300,
489 0x00006600, 0x00009900, 0x0000CC00, 0x0000FF00, 0x00000033, 0x00000066,
490 0x00000099, 0x000000CC, 0x000000FF, 0x00333300, 0x00666600, 0x00999900,
491 0x00CCCC00, 0x00FFFF00, 0x00003333, 0x00006666, 0x00009999, 0x0000CCCC,
492 0x0000FFFF, 0x00330033, 0x00660066, 0x00990099, 0x00CC00CC, 0x00FF00FF,
493 0x00FFFF33, 0x00FFFF66, 0x00FFFF99, 0x00FFFFCC, 0x00FF33FF, 0x00FF66FF,
494 0x00FF99FF, 0x00FFCCFF, 0x0033FFFF, 0x0066FFFF, 0x0099FFFF, 0x00CCFFFF,
495 0x00CCCC33, 0x00CCCC66, 0x00CCCC99, 0x00CCCCFF, 0x00CC33CC, 0x00CC66CC,
496 0x00CC99CC, 0x00CCFFCC, 0x0033CCCC, 0x0066CCCC, 0x0099CCCC, 0x00FFCCCC,
497 0x00999933, 0x00999966, 0x009999CC, 0x009999FF, 0x00993399, 0x00996699,
498 0x0099CC99, 0x0099FF99, 0x00339999, 0x00669999, 0x00CC9999, 0x00FF9999,
499 0x00666633, 0x00666699, 0x006666CC, 0x006666FF, 0x00663366, 0x00669966,
500 0x0066CC66, 0x0066FF66, 0x00336666, 0x00996666, 0x00CC6666, 0x00FF6666,
501 0x00333366, 0x00333399, 0x003333CC, 0x003333FF, 0x00336633, 0x00339933,
502 0x0033CC33, 0x0033FF33, 0x00663333, 0x00993333, 0x00CC3333, 0x00FF3333,
503 0x00003366, 0x00336600, 0x00660033, 0x00006633, 0x00330066, 0x00663300,
504 0x00336699, 0x00669933, 0x00993366, 0x00339966, 0x00663399, 0x00996633,
505 0x006699CC, 0x0099CC66, 0x00CC6699, 0x0066CC99, 0x009966CC, 0x00CC9966,
506 0x0099CCFF, 0x00CCFF99, 0x00FF99CC, 0x0099FFCC, 0x00CC99FF, 0x00FFCC99,
507 0x00111111, 0x00222222, 0x00444444, 0x00555555, 0x00AAAAAA, 0x00BBBBBB,
508 0x00DDDDDD, 0x00EEEEEE
511 static int generate_default_palette(Palette * palette)
513 memcpy(palette->colors, default_screen_video_v2_palette,
514 sizeof(default_screen_video_v2_palette));
516 return update_palette_index(palette);
519 static int generate_optimum_palette(Palette * palette, const uint8_t * image,
520 int width, int height, int stride)
522 //this isn't implemented yet! Default palette only!
526 static inline int encode_15_7_sl(Palette * palette, uint8_t * dest,
527 const uint8_t * src, int width, int dist)
530 for (x = 0; x < width; x++) {
531 len += write_pixel_15_7(palette, dest + len, src + 3 * x, dist);
536 static int encode_15_7(Palette * palette, Block * b, const uint8_t * src,
537 int stride, int dist)
540 uint8_t *ptr = b->enc;
541 for (i = 0; i < b->start; i++)
542 ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist);
544 for (; i < b->start + b->len; i++)
545 ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist);
547 for (; i < b->height; i++)
548 ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist);
549 b->enc_size = ptr - b->enc;
553 static int encode_block(FlashSV2Context *s, Palette * palette, Block * b,
554 Block * prev, const uint8_t * src, int stride, int comp,
555 int dist, int keyframe)
557 unsigned buf_size = b->width * b->height * 6;
558 uint8_t *buf = s->blockbuffer;
561 if (b->flags & COLORSPACE_15_7) {
562 encode_15_7(palette, b, src, stride, dist);
564 encode_bgr(b, src, stride);
568 b->data_size = buf_size;
569 res = encode_zlib(b, b->data, &b->data_size, comp);
574 res = encode_zlibprime(b, prev, buf, &buf_size, comp);
578 if (buf_size < b->data_size) {
579 b->data_size = buf_size;
580 memcpy(b->data, buf, buf_size);
581 b->flags |= ZLIB_PRIME_COMPRESS_PREVIOUS;
590 static int compare_sl(FlashSV2Context * s, Block * b, const uint8_t * src,
591 uint8_t * frame, uint8_t * key, int y, int keyframe)
593 if (memcmp(src, frame, b->width * 3) != 0) {
595 memcpy(frame, src, b->width * 3);
596 #ifndef FLASHSV2_DUMB
600 if (memcmp(src, key, b->width * 3) != 0) {
603 b->len = y + 1 - b->start;
608 static int mark_all_blocks(FlashSV2Context * s, const uint8_t * src, int stride,
611 int sl, rsl, col, pos, possl;
613 for (sl = s->image_height - 1; sl >= 0; sl--) {
614 for (col = 0; col < s->cols; col++) {
615 rsl = s->image_height - sl - 1;
616 b = s->frame_blocks + col + rsl / s->block_height * s->cols;
617 possl = stride * sl + col * s->block_width * 3;
618 pos = s->image_width * rsl * 3 + col * s->block_width * 3;
619 compare_sl(s, b, src + possl, s->current_frame + pos,
620 s->key_frame + pos, rsl % s->block_height, keyframe);
623 #ifndef FLASHSV2_DUMB
624 s->tot_lines += s->image_height * s->cols;
629 static int encode_all_blocks(FlashSV2Context * s, int keyframe)
634 for (row = 0; row < s->rows; row++) {
635 for (col = 0; col < s->cols; col++) {
636 b = s->frame_blocks + (row * s->cols + col);
637 prev = s->key_blocks + (row * s->cols + col);
638 b->flags = s->use15_7 ? COLORSPACE_15_7 : 0;
642 } else if (!b->dirty) {
647 } else if (b->start != 0 || b->len != b->height) {
648 b->flags |= HAS_DIFF_BLOCKS;
650 data = s->current_frame + s->image_width * 3 * s->block_height * row + s->block_width * col * 3;
651 res = encode_block(s, &s->palette, b, prev, data, s->image_width * 3, s->comp, s->dist, keyframe);
652 #ifndef FLASHSV2_DUMB
655 s->comp_size += b->data_size;
656 s->uncomp_size += b->enc_size;
662 #ifndef FLASHSV2_DUMB
663 s->raw_size += s->image_width * s->image_height * 3;
664 s->tot_blocks += s->rows * s->cols;
669 static int write_all_blocks(FlashSV2Context * s, uint8_t * buf,
672 int row, col, buf_pos = 0, len;
674 for (row = 0; row < s->rows; row++) {
675 for (col = 0; col < s->cols; col++) {
676 b = s->frame_blocks + row * s->cols + col;
677 len = write_block(b, buf + buf_pos, buf_size - buf_pos);
678 b->start = b->len = b->dirty = 0;
687 static int write_bitstream(FlashSV2Context * s, const uint8_t * src, int stride,
688 uint8_t * buf, int buf_size, int keyframe)
692 res = mark_all_blocks(s, src, stride, keyframe);
695 res = encode_all_blocks(s, keyframe);
699 res = write_header(s, buf, buf_size);
705 res = write_all_blocks(s, buf + buf_pos, buf_size - buf_pos);
709 #ifndef FLASHSV2_DUMB
710 s->total_bits += ((double) buf_pos) * 8.0;
716 static void recommend_keyframe(FlashSV2Context * s, int *keyframe)
718 #ifndef FLASHSV2_DUMB
719 double block_ratio, line_ratio, enc_ratio, comp_ratio, data_ratio;
720 if (s->avctx->gop_size > 0) {
721 block_ratio = s->diff_blocks / s->tot_blocks;
722 line_ratio = s->diff_lines / s->tot_lines;
723 enc_ratio = s->uncomp_size / s->raw_size;
724 comp_ratio = s->comp_size / s->uncomp_size;
725 data_ratio = s->comp_size / s->raw_size;
727 if ((block_ratio >= 0.5 && line_ratio / block_ratio <= 0.5) || line_ratio >= 0.95) {
737 #ifndef FLASHSV2_DUMB
738 static const double block_size_fraction = 1.0 / 300;
739 static const double use15_7_threshold = 8192;
740 static const double color15_7_factor = 100;
742 static int optimum_block_width(FlashSV2Context * s)
744 #ifndef FLASHSV2_DUMB
745 double save = (1-pow(s->diff_lines/s->diff_blocks/s->block_height, 0.5)) * s->comp_size/s->tot_blocks;
746 double width = block_size_fraction * sqrt(0.5 * save * s->rows * s->cols) * s->image_width;
747 int pwidth = ((int) width);
748 return FFCLIP(pwidth & ~15, 256, 16);
754 static int optimum_block_height(FlashSV2Context * s)
756 #ifndef FLASHSV2_DUMB
757 double save = (1-pow(s->diff_lines/s->diff_blocks/s->block_height, 0.5)) * s->comp_size/s->tot_blocks;
758 double height = block_size_fraction * sqrt(0.5 * save * s->rows * s->cols) * s->image_height;
759 int pheight = ((int) height);
760 return FFCLIP(pheight & ~15, 256, 16);
766 static int optimum_use15_7(FlashSV2Context * s)
768 #ifndef FLASHSV2_DUMB
769 double ideal = ((double)(s->avctx->bit_rate * s->avctx->time_base.den * s->avctx->ticks_per_frame)) /
770 ((double) s->avctx->time_base.num) * s->avctx->frame_number;
771 if (ideal + use15_7_threshold < s->total_bits) {
777 return s->avctx->global_quality == 0;
781 static int optimum_dist(FlashSV2Context * s)
783 #ifndef FLASHSV2_DUMB
785 s->avctx->bit_rate * s->avctx->time_base.den *
786 s->avctx->ticks_per_frame;
787 int dist = pow((s->total_bits / ideal) * color15_7_factor, 3);
788 av_log(s->avctx, AV_LOG_DEBUG, "dist: %d\n", dist);
796 static int reconfigure_at_keyframe(FlashSV2Context * s, const uint8_t * image,
799 int update_palette = 0;
801 int block_width = optimum_block_width (s);
802 int block_height = optimum_block_height(s);
804 s->rows = (s->image_height + block_height - 1) / block_height;
805 s->cols = (s->image_width + block_width - 1) / block_width;
807 if (block_width != s->block_width || block_height != s->block_height) {
808 s->block_width = block_width;
809 s->block_height = block_height;
810 if (s->rows * s->cols > s->blocks_size / sizeof(Block)) {
811 s->frame_blocks = av_realloc_array(s->frame_blocks, s->rows, s->cols * sizeof(Block));
812 s->key_blocks = av_realloc_array(s->key_blocks, s->cols, s->rows * sizeof(Block));
813 if (!s->frame_blocks || !s->key_blocks) {
814 av_log(s->avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
817 s->blocks_size = s->rows * s->cols * sizeof(Block);
819 init_blocks(s, s->frame_blocks, s->encbuffer, s->databuffer);
820 init_blocks(s, s->key_blocks, s->keybuffer, 0);
822 av_fast_malloc(&s->blockbuffer, &s->blockbuffer_size, block_width * block_height * 6);
823 if (!s->blockbuffer) {
824 av_log(s->avctx, AV_LOG_ERROR, "Could not allocate block buffer.\n");
825 return AVERROR(ENOMEM);
829 s->use15_7 = optimum_use15_7(s);
831 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);
836 av_log(s->avctx, AV_LOG_DEBUG, "Generated optimum palette\n");
837 } else if (!s->use_custom_palette && s->palette_type != 0) {
838 res = generate_default_palette(&s->palette);
842 av_log(s->avctx, AV_LOG_DEBUG, "Generated default palette\n");
852 static int flashsv2_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
853 const AVFrame *p, int *got_packet)
855 FlashSV2Context *const s = avctx->priv_data;
859 if ((res = ff_alloc_packet2(avctx, pkt, s->frame_size + AV_INPUT_BUFFER_MIN_SIZE, 0)) < 0)
862 /* First frame needs to be a keyframe */
863 if (avctx->frame_number == 0)
866 /* Check the placement of keyframes */
867 if (avctx->gop_size > 0) {
868 if (avctx->frame_number >= s->last_key_frame + avctx->gop_size)
873 && avctx->frame_number > s->last_key_frame + avctx->keyint_min) {
874 recommend_keyframe(s, &keyframe);
876 av_log(avctx, AV_LOG_DEBUG, "Recommending key frame at frame %d\n", avctx->frame_number);
880 res = reconfigure_at_keyframe(s, p->data[0], p->linesize[0]);
886 s->dist = optimum_dist(s);
888 res = write_bitstream(s, p->data[0], p->linesize[0], pkt->data, pkt->size, keyframe);
892 s->last_key_frame = avctx->frame_number;
893 pkt->flags |= AV_PKT_FLAG_KEY;
894 av_log(avctx, AV_LOG_DEBUG, "Inserting key frame at frame %d\n", avctx->frame_number);
903 static av_cold int flashsv2_encode_end(AVCodecContext * avctx)
905 FlashSV2Context *s = avctx->priv_data;
912 AVCodec ff_flashsv2_encoder = {
914 .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video Version 2"),
915 .type = AVMEDIA_TYPE_VIDEO,
916 .id = AV_CODEC_ID_FLASHSV2,
917 .priv_data_size = sizeof(FlashSV2Context),
918 .init = flashsv2_encode_init,
919 .encode2 = flashsv2_encode_frame,
920 .close = flashsv2_encode_end,
921 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },