LCOV - code coverage report
Current view: top level - libavcodec - flashsv2enc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 328 409 80.2 %
Date: 2017-12-17 11:58:42 Functions: 32 36 88.9 %

          Line data    Source code
       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           4 : static av_cold void cleanup(FlashSV2Context * s)
     128             : {
     129           4 :     av_freep(&s->encbuffer);
     130           4 :     av_freep(&s->keybuffer);
     131           4 :     av_freep(&s->databuffer);
     132           4 :     av_freep(&s->blockbuffer);
     133           4 :     av_freep(&s->current_frame);
     134           4 :     av_freep(&s->key_frame);
     135             : 
     136           4 :     av_freep(&s->frame_blocks);
     137           4 :     av_freep(&s->key_blocks);
     138           4 : }
     139             : 
     140          16 : static void init_blocks(FlashSV2Context * s, Block * blocks,
     141             :                         uint8_t * encbuf, uint8_t * databuf)
     142             : {
     143             :     int row, col;
     144             :     Block *b;
     145         254 :     for (col = 0; col < s->cols; col++) {
     146        5108 :         for (row = 0; row < s->rows; row++) {
     147        4870 :             b = blocks + (col + row * s->cols);
     148        9740 :             b->width = (col < s->cols - 1) ?
     149        4662 :                 s->block_width :
     150         208 :                 s->image_width - col * s->block_width;
     151             : 
     152        9740 :             b->height = (row < s->rows - 1) ?
     153        4632 :                 s->block_height :
     154         238 :                 s->image_height - row * s->block_height;
     155             : 
     156        4870 :             b->row   = row;
     157        4870 :             b->col   = col;
     158        4870 :             b->enc   = encbuf;
     159        4870 :             b->data  = databuf;
     160        4870 :             encbuf  += b->width * b->height * 3;
     161        4870 :             databuf += !databuf ? 0 : b->width * b->height * 6;
     162             :         }
     163             :     }
     164          16 : }
     165             : 
     166          24 : 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          24 : }
     176             : 
     177           4 : static av_cold int flashsv2_encode_init(AVCodecContext * avctx)
     178             : {
     179           4 :     FlashSV2Context *s = avctx->priv_data;
     180             : 
     181           4 :     s->avctx = avctx;
     182             : 
     183           4 :     s->comp = avctx->compression_level;
     184           4 :     if (s->comp == -1)
     185           0 :         s->comp = 9;
     186           4 :     if (s->comp < 0 || s->comp > 9) {
     187           0 :         av_log(avctx, AV_LOG_ERROR,
     188             :                "Compression level should be 0-9, not %d\n", s->comp);
     189           0 :         return -1;
     190             :     }
     191             : 
     192             : 
     193           4 :     if ((avctx->width > 4095) || (avctx->height > 4095)) {
     194           0 :         av_log(avctx, AV_LOG_ERROR,
     195             :                "Input dimensions too large, input must be max 4095x4095 !\n");
     196           0 :         return -1;
     197             :     }
     198           4 :     if ((avctx->width < 16) || (avctx->height < 16)) {
     199           0 :         av_log(avctx, AV_LOG_ERROR,
     200             :                "Input dimensions too small, input must be at least 16x16 !\n");
     201           0 :         return -1;
     202             :     }
     203             : 
     204           4 :     if (av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0)
     205           0 :         return -1;
     206             : 
     207             : 
     208           4 :     s->last_key_frame = 0;
     209             : 
     210           4 :     s->image_width  = avctx->width;
     211           4 :     s->image_height = avctx->height;
     212             : 
     213           4 :     s->block_width  = (s->image_width /  12) & ~15;
     214           4 :     s->block_height = (s->image_height / 12) & ~15;
     215             : 
     216           4 :     if(!s->block_width)
     217           1 :         s->block_width = 1;
     218           4 :     if(!s->block_height)
     219           1 :         s->block_height = 1;
     220             : 
     221           4 :     s->rows = (s->image_height + s->block_height - 1) / s->block_height;
     222           4 :     s->cols = (s->image_width +  s->block_width -  1) / s->block_width;
     223             : 
     224           4 :     s->frame_size  = s->image_width * s->image_height * 3;
     225           4 :     s->blocks_size = s->rows * s->cols * sizeof(Block);
     226             : 
     227           4 :     s->encbuffer     = av_mallocz(s->frame_size);
     228           4 :     s->keybuffer     = av_mallocz(s->frame_size);
     229           4 :     s->databuffer    = av_mallocz(s->frame_size * 6);
     230           4 :     s->current_frame = av_mallocz(s->frame_size);
     231           4 :     s->key_frame     = av_mallocz(s->frame_size);
     232           4 :     s->frame_blocks  = av_mallocz(s->blocks_size);
     233           4 :     s->key_blocks    = av_mallocz(s->blocks_size);
     234             : 
     235           4 :     s->blockbuffer      = NULL;
     236           4 :     s->blockbuffer_size = 0;
     237             : 
     238           4 :     init_blocks(s, s->frame_blocks, s->encbuffer, s->databuffer);
     239           4 :     init_blocks(s, s->key_blocks,   s->keybuffer, 0);
     240           4 :     reset_stats(s);
     241             : #ifndef FLASHSV2_DUMB
     242             :     s->total_bits = 1;
     243             : #endif
     244             : 
     245           4 :     s->use_custom_palette =  0;
     246           4 :     s->palette_type       = -1;        // so that the palette will be generated in reconfigure_at_keyframe
     247             : 
     248           4 :     if (!s->encbuffer || !s->keybuffer || !s->databuffer
     249           4 :         || !s->current_frame || !s->key_frame || !s->key_blocks
     250           4 :         || !s->frame_blocks) {
     251           0 :         av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
     252           0 :         cleanup(s);
     253           0 :         return -1;
     254             :     }
     255             : 
     256           4 :     return 0;
     257             : }
     258             : 
     259          20 : static int new_key_frame(FlashSV2Context * s)
     260             : {
     261             :     int i;
     262          20 :     memcpy(s->key_blocks, s->frame_blocks, s->blocks_size);
     263          20 :     memcpy(s->key_frame, s->current_frame, s->frame_size);
     264             : 
     265         475 :     for (i = 0; i < s->rows * s->cols; i++) {
     266         455 :         s->key_blocks[i].enc += (s->keybuffer - s->encbuffer);
     267         455 :         s->key_blocks[i].sl_begin = 0;
     268         455 :         s->key_blocks[i].sl_end   = 0;
     269         455 :         s->key_blocks[i].data     = 0;
     270             :     }
     271          20 :     memcpy(s->keybuffer, s->encbuffer, s->frame_size);
     272             : 
     273          20 :     return 0;
     274             : }
     275             : 
     276           0 : static int write_palette(FlashSV2Context * s, uint8_t * buf, int buf_size)
     277             : {
     278             :     //this isn't implemented yet!  Default palette only!
     279           0 :     return -1;
     280             : }
     281             : 
     282         200 : static int write_header(FlashSV2Context * s, uint8_t * buf, int buf_size)
     283             : {
     284             :     PutBitContext pb;
     285             :     int buf_pos, len;
     286             : 
     287         200 :     if (buf_size < 5)
     288           0 :         return -1;
     289             : 
     290         200 :     init_put_bits(&pb, buf, buf_size);
     291             : 
     292         200 :     put_bits(&pb, 4, (s->block_width  >> 4) - 1);
     293         200 :     put_bits(&pb, 12, s->image_width);
     294         200 :     put_bits(&pb, 4, (s->block_height >> 4) - 1);
     295         200 :     put_bits(&pb, 12, s->image_height);
     296             : 
     297         200 :     flush_put_bits(&pb);
     298         200 :     buf_pos = 4;
     299             : 
     300         200 :     buf[buf_pos++] = s->flags;
     301             : 
     302         200 :     if (s->flags & HAS_PALLET_INFO) {
     303           0 :         len = write_palette(s, buf + buf_pos, buf_size - buf_pos);
     304           0 :         if (len < 0)
     305           0 :             return -1;
     306           0 :         buf_pos += len;
     307             :     }
     308             : 
     309         200 :     return buf_pos;
     310             : }
     311             : 
     312        4550 : static int write_block(Block * b, uint8_t * buf, int buf_size)
     313             : {
     314        4550 :     int buf_pos = 0;
     315        4550 :     unsigned block_size = b->data_size;
     316             : 
     317        4550 :     if (b->flags & HAS_DIFF_BLOCKS)
     318           0 :         block_size += 2;
     319        4550 :     if (b->flags & ZLIB_PRIME_COMPRESS_CURRENT)
     320           0 :         block_size += 2;
     321        4550 :     if (block_size > 0)
     322        4550 :         block_size += 1;
     323        4550 :     if (buf_size < block_size + 2)
     324           0 :         return -1;
     325             : 
     326        4550 :     buf[buf_pos++] = block_size >> 8;
     327        4550 :     buf[buf_pos++] = block_size;
     328             : 
     329        4550 :     if (block_size == 0)
     330           0 :         return buf_pos;
     331             : 
     332        4550 :     buf[buf_pos++] = b->flags;
     333             : 
     334        4550 :     if (b->flags & HAS_DIFF_BLOCKS) {
     335           0 :         buf[buf_pos++] = (b->start);
     336           0 :         buf[buf_pos++] = (b->len);
     337             :     }
     338             : 
     339        4550 :     if (b->flags & ZLIB_PRIME_COMPRESS_CURRENT) {
     340             :         //This feature of the format is poorly understood, and as of now, unused.
     341           0 :         buf[buf_pos++] = (b->col);
     342           0 :         buf[buf_pos++] = (b->row);
     343             :     }
     344             : 
     345        4550 :     memcpy(buf + buf_pos, b->data, b->data_size);
     346             : 
     347        4550 :     buf_pos += b->data_size;
     348             : 
     349        4550 :     return buf_pos;
     350             : }
     351             : 
     352        4550 : static int encode_zlib(Block * b, uint8_t * buf, unsigned long *buf_size, int comp)
     353             : {
     354        4550 :     int res = compress2(buf, buf_size, b->sl_begin, b->sl_end - b->sl_begin, comp);
     355        4550 :     return res == Z_OK ? 0 : -1;
     356             : }
     357             : 
     358        4095 : 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        4095 :     s.zalloc = NULL;
     364        4095 :     s.zfree  = NULL;
     365        4095 :     s.opaque = NULL;
     366        4095 :     res = deflateInit(&s, comp);
     367        4095 :     if (res < 0)
     368           0 :         return -1;
     369             : 
     370        4095 :     s.next_in  = prime->enc;
     371        4095 :     s.avail_in = prime->enc_size;
     372       12285 :     while (s.avail_in > 0) {
     373        4095 :         s.next_out  = buf;
     374        4095 :         s.avail_out = *buf_size;
     375        4095 :         res = deflate(&s, Z_SYNC_FLUSH);
     376        4095 :         if (res < 0)
     377           0 :             return -1;
     378             :     }
     379             : 
     380        4095 :     s.next_in   = b->sl_begin;
     381        4095 :     s.avail_in  = b->sl_end - b->sl_begin;
     382        4095 :     s.next_out  = buf;
     383        4095 :     s.avail_out = *buf_size;
     384        4095 :     res = deflate(&s, Z_FINISH);
     385        4095 :     deflateEnd(&s);
     386        4095 :     *buf_size -= s.avail_out;
     387        4095 :     if (res != Z_STREAM_END)
     388           0 :         return -1;
     389        4095 :     return 0;
     390             : }
     391             : 
     392           0 : static int encode_bgr(Block * b, const uint8_t * src, int stride)
     393             : {
     394             :     int i;
     395           0 :     uint8_t *ptr = b->enc;
     396           0 :     for (i = 0; i < b->start; i++)
     397           0 :         memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3);
     398           0 :     b->sl_begin = ptr + i * b->width * 3;
     399           0 :     for (; i < b->start + b->len; i++)
     400           0 :         memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3);
     401           0 :     b->sl_end = ptr + i * b->width * 3;
     402           0 :     for (; i < b->height; i++)
     403           0 :         memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3);
     404           0 :     b->enc_size = ptr + i * b->width * 3 - b->enc;
     405           0 :     return b->enc_size;
     406             : }
     407             : 
     408    15264200 : static inline unsigned pixel_color15(const uint8_t * src)
     409             : {
     410    15264200 :     return (src[0] >> 3) | ((src[1] & 0xf8) << 2) | ((src[2] & 0xf8) << 7);
     411             : }
     412             : 
     413    47305616 : static inline unsigned int chroma_diff(unsigned int c1, unsigned int c2)
     414             : {
     415             : #define ABSDIFF(a,b) (abs((int)(a)-(int)(b)))
     416             : 
     417    47305616 :     unsigned int t1 = (c1 & 0x000000ff) + ((c1 & 0x0000ff00) >> 8) + ((c1 & 0x00ff0000) >> 16);
     418    47305616 :     unsigned int t2 = (c2 & 0x000000ff) + ((c2 & 0x0000ff00) >> 8) + ((c2 & 0x00ff0000) >> 16);
     419             : 
     420    94611232 :     return ABSDIFF(t1, t2) + ABSDIFF(c1 & 0x000000ff, c2 & 0x000000ff) +
     421    94611232 :         ABSDIFF((c1 & 0x0000ff00) >> 8 , (c2 & 0x0000ff00) >> 8) +
     422    47305616 :         ABSDIFF((c1 & 0x00ff0000) >> 16, (c2 & 0x00ff0000) >> 16);
     423             : }
     424             : 
     425    15264200 : static inline int pixel_color7_fast(Palette * palette, unsigned c15)
     426             : {
     427    15264200 :     return palette->index[c15];
     428             : }
     429             : 
     430      131072 : static int pixel_color7_slow(Palette * palette, unsigned color)
     431             : {
     432      131072 :     int i, min = 0x7fffffff;
     433      131072 :     int minc = -1;
     434    16908288 :     for (i = 0; i < 128; i++) {
     435    16777216 :         int c1 = palette->colors[i];
     436    16777216 :         int diff = chroma_diff(c1, color);
     437    16777216 :         if (diff < min) {
     438      813324 :             min = diff;
     439      813324 :             minc = i;
     440             :         }
     441             :     }
     442      131072 :     return minc;
     443             : }
     444             : 
     445    15264200 : static inline unsigned pixel_bgr(const uint8_t * src)
     446             : {
     447    15264200 :     return (src[0]) | (src[1] << 8) | (src[2] << 16);
     448             : }
     449             : 
     450    15264200 : static int write_pixel_15_7(Palette * palette, uint8_t * dest, const uint8_t * src,
     451             :                             int dist)
     452             : {
     453    15264200 :     unsigned c15 = pixel_color15(src);
     454    15264200 :     unsigned color = pixel_bgr(src);
     455    15264200 :     int d15 = chroma_diff(color, color & 0x00f8f8f8);
     456    15264200 :     int c7 = pixel_color7_fast(palette, c15);
     457    15264200 :     int d7 = chroma_diff(color, palette->colors[c7]);
     458    15264200 :     if (dist + d15 >= d7) {
     459     3161177 :         dest[0] = c7;
     460     3161177 :         return 1;
     461             :     } else {
     462    12103023 :         dest[0] = 0x80 | (c15 >> 8);
     463    12103023 :         dest[1] = c15 & 0xff;
     464    12103023 :         return 2;
     465             :     }
     466             : }
     467             : 
     468           4 : static int update_palette_index(Palette * palette)
     469             : {
     470             :     int r, g, b;
     471             :     unsigned int bgr, c15, index;
     472         132 :     for (r = 4; r < 256; r += 8) {
     473        4224 :         for (g = 4; g < 256; g += 8) {
     474      135168 :             for (b = 4; b < 256; b += 8) {
     475      131072 :                 bgr = b | (g << 8) | (r << 16);
     476      131072 :                 c15 = (b >> 3) | ((g & 0xf8) << 2) | ((r & 0xf8) << 7);
     477      131072 :                 index = pixel_color7_slow(palette, bgr);
     478             : 
     479      131072 :                 palette->index[c15] = index;
     480             :             }
     481             :         }
     482             :     }
     483           4 :     return 0;
     484             : }
     485             : 
     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
     509             : };
     510             : 
     511           4 : static int generate_default_palette(Palette * palette)
     512             : {
     513           4 :     memcpy(palette->colors, default_screen_video_v2_palette,
     514             :            sizeof(default_screen_video_v2_palette));
     515             : 
     516           4 :     return update_palette_index(palette);
     517             : }
     518             : 
     519           0 : static int generate_optimum_palette(Palette * palette, const uint8_t * image,
     520             :                                    int width, int height, int stride)
     521             : {
     522             :     //this isn't implemented yet!  Default palette only!
     523           0 :     return -1;
     524             : }
     525             : 
     526      260900 : static inline int encode_15_7_sl(Palette * palette, uint8_t * dest,
     527             :                                  const uint8_t * src, int width, int dist)
     528             : {
     529      260900 :     int len = 0, x;
     530    15525100 :     for (x = 0; x < width; x++) {
     531    15264200 :         len += write_pixel_15_7(palette, dest + len, src + 3 * x, dist);
     532             :     }
     533      260900 :     return len;
     534             : }
     535             : 
     536        4550 : static int encode_15_7(Palette * palette, Block * b, const uint8_t * src,
     537             :                        int stride, int dist)
     538             : {
     539             :     int i;
     540        4550 :     uint8_t *ptr = b->enc;
     541        4550 :     for (i = 0; i < b->start; i++)
     542           0 :         ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist);
     543        4550 :     b->sl_begin = ptr;
     544      265450 :     for (; i < b->start + b->len; i++)
     545      260900 :         ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist);
     546        4550 :     b->sl_end = ptr;
     547        4550 :     for (; i < b->height; i++)
     548           0 :         ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist);
     549        4550 :     b->enc_size = ptr - b->enc;
     550        4550 :     return b->enc_size;
     551             : }
     552             : 
     553        4550 : 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)
     556             : {
     557        4550 :     unsigned buf_size = b->width * b->height * 6;
     558        4550 :     uint8_t *buf = s->blockbuffer;
     559             :     int res;
     560             : 
     561        4550 :     if (b->flags & COLORSPACE_15_7) {
     562        4550 :         encode_15_7(palette, b, src, stride, dist);
     563             :     } else {
     564           0 :         encode_bgr(b, src, stride);
     565             :     }
     566             : 
     567        4550 :     if (b->len > 0) {
     568        4550 :         b->data_size = buf_size;
     569        4550 :         res = encode_zlib(b, b->data, &b->data_size, comp);
     570        4550 :         if (res)
     571           0 :             return res;
     572             : 
     573        4550 :         if (!keyframe) {
     574        4095 :             res = encode_zlibprime(b, prev, buf, &buf_size, comp);
     575        4095 :             if (res)
     576           0 :                 return res;
     577             : 
     578        4095 :             if (buf_size < b->data_size) {
     579        4095 :                 b->data_size = buf_size;
     580        4095 :                 memcpy(b->data, buf, buf_size);
     581        4095 :                 b->flags |= ZLIB_PRIME_COMPRESS_PREVIOUS;
     582             :             }
     583             :         }
     584             :     } else {
     585           0 :         b->data_size = 0;
     586             :     }
     587        4550 :     return 0;
     588             : }
     589             : 
     590      260900 : static int compare_sl(FlashSV2Context * s, Block * b, const uint8_t * src,
     591             :                       uint8_t * frame, uint8_t * key, int y, int keyframe)
     592             : {
     593      260900 :     if (memcmp(src, frame, b->width * 3) != 0) {
     594      260900 :         b->dirty = 1;
     595      260900 :         memcpy(frame, src, b->width * 3);
     596             : #ifndef FLASHSV2_DUMB
     597             :         s->diff_lines++;
     598             : #endif
     599             :     }
     600      260900 :     if (memcmp(src, key, b->width * 3) != 0) {
     601      260900 :         if (b->len == 0)
     602        4550 :             b->start = y;
     603      260900 :         b->len = y + 1 - b->start;
     604             :     }
     605      260900 :     return 0;
     606             : }
     607             : 
     608         200 : static int mark_all_blocks(FlashSV2Context * s, const uint8_t * src, int stride,
     609             :                            int keyframe)
     610             : {
     611             :     int sl, rsl, col, pos, possl;
     612             :     Block *b;
     613       45100 :     for (sl = s->image_height - 1; sl >= 0; sl--) {
     614      305800 :         for (col = 0; col < s->cols; col++) {
     615      260900 :             rsl = s->image_height - sl - 1;
     616      260900 :             b = s->frame_blocks + col + rsl / s->block_height * s->cols;
     617      260900 :             possl = stride * sl + col * s->block_width * 3;
     618      260900 :             pos = s->image_width * rsl * 3 + col * s->block_width * 3;
     619      521800 :             compare_sl(s, b, src + possl, s->current_frame + pos,
     620      521800 :                        s->key_frame + pos, rsl % s->block_height, keyframe);
     621             :         }
     622             :     }
     623             : #ifndef FLASHSV2_DUMB
     624             :     s->tot_lines += s->image_height * s->cols;
     625             : #endif
     626         200 :     return 0;
     627             : }
     628             : 
     629         200 : static int encode_all_blocks(FlashSV2Context * s, int keyframe)
     630             : {
     631             :     int row, col, res;
     632             :     uint8_t *data;
     633             :     Block *b, *prev;
     634        1000 :     for (row = 0; row < s->rows; row++) {
     635        5350 :         for (col = 0; col < s->cols; col++) {
     636        4550 :             b = s->frame_blocks + (row * s->cols + col);
     637        4550 :             prev = s->key_blocks + (row * s->cols + col);
     638        4550 :             b->flags = s->use15_7 ? COLORSPACE_15_7 : 0;
     639        4550 :             if (keyframe) {
     640         455 :                 b->start = 0;
     641         455 :                 b->len = b->height;
     642        4095 :             } else if (!b->dirty) {
     643           0 :                 b->start = 0;
     644           0 :                 b->len = 0;
     645           0 :                 b->data_size = 0;
     646           0 :                 continue;
     647        4095 :             } else if (b->start != 0 || b->len != b->height) {
     648           0 :                 b->flags |= HAS_DIFF_BLOCKS;
     649             :             }
     650        4550 :             data = s->current_frame + s->image_width * 3 * s->block_height * row + s->block_width * col * 3;
     651        4550 :             res = encode_block(s, &s->palette, b, prev, data, s->image_width * 3, s->comp, s->dist, keyframe);
     652             : #ifndef FLASHSV2_DUMB
     653             :             if (b->dirty)
     654             :                 s->diff_blocks++;
     655             :             s->comp_size += b->data_size;
     656             :             s->uncomp_size += b->enc_size;
     657             : #endif
     658        4550 :             if (res)
     659           0 :                 return res;
     660             :         }
     661             :     }
     662             : #ifndef FLASHSV2_DUMB
     663             :     s->raw_size += s->image_width * s->image_height * 3;
     664             :     s->tot_blocks += s->rows * s->cols;
     665             : #endif
     666         200 :     return 0;
     667             : }
     668             : 
     669         200 : static int write_all_blocks(FlashSV2Context * s, uint8_t * buf,
     670             :                             int buf_size)
     671             : {
     672         200 :     int row, col, buf_pos = 0, len;
     673             :     Block *b;
     674        1000 :     for (row = 0; row < s->rows; row++) {
     675        5350 :         for (col = 0; col < s->cols; col++) {
     676        4550 :             b = s->frame_blocks + row * s->cols + col;
     677        4550 :             len = write_block(b, buf + buf_pos, buf_size - buf_pos);
     678        4550 :             b->start = b->len = b->dirty = 0;
     679        4550 :             if (len < 0)
     680           0 :                 return len;
     681        4550 :             buf_pos += len;
     682             :         }
     683             :     }
     684         200 :     return buf_pos;
     685             : }
     686             : 
     687         200 : static int write_bitstream(FlashSV2Context * s, const uint8_t * src, int stride,
     688             :                            uint8_t * buf, int buf_size, int keyframe)
     689             : {
     690             :     int buf_pos, res;
     691             : 
     692         200 :     res = mark_all_blocks(s, src, stride, keyframe);
     693         200 :     if (res)
     694           0 :         return res;
     695         200 :     res = encode_all_blocks(s, keyframe);
     696         200 :     if (res)
     697           0 :         return res;
     698             : 
     699         200 :     res = write_header(s, buf, buf_size);
     700         200 :     if (res < 0) {
     701           0 :         return res;
     702             :     } else {
     703         200 :         buf_pos = res;
     704             :     }
     705         200 :     res = write_all_blocks(s, buf + buf_pos, buf_size - buf_pos);
     706         200 :     if (res < 0)
     707           0 :         return res;
     708         200 :     buf_pos += res;
     709             : #ifndef FLASHSV2_DUMB
     710             :     s->total_bits += ((double) buf_pos) * 8.0;
     711             : #endif
     712             : 
     713         200 :     return buf_pos;
     714             : }
     715             : 
     716           0 : static void recommend_keyframe(FlashSV2Context * s, int *keyframe)
     717             : {
     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;
     726             : 
     727             :         if ((block_ratio >= 0.5 && line_ratio / block_ratio <= 0.5) || line_ratio >= 0.95) {
     728             :             *keyframe = 1;
     729             :             return;
     730             :         }
     731             :     }
     732             : #else
     733           0 :     return;
     734             : #endif
     735             : }
     736             : 
     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;
     741             : #endif
     742          20 : static int optimum_block_width(FlashSV2Context * s)
     743             : {
     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);
     749             : #else
     750          20 :     return 64;
     751             : #endif
     752             : }
     753             : 
     754          20 : static int optimum_block_height(FlashSV2Context * s)
     755             : {
     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);
     761             : #else
     762          20 :     return 64;
     763             : #endif
     764             : }
     765             : 
     766          20 : static int optimum_use15_7(FlashSV2Context * s)
     767             : {
     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) {
     772             :         return 1;
     773             :     } else {
     774             :         return 0;
     775             :     }
     776             : #else
     777          20 :     return s->avctx->global_quality == 0;
     778             : #endif
     779             : }
     780             : 
     781         200 : static int optimum_dist(FlashSV2Context * s)
     782             : {
     783             : #ifndef FLASHSV2_DUMB
     784             :     double ideal =
     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);
     789             :     return dist;
     790             : #else
     791         200 :     return 15;
     792             : #endif
     793             : }
     794             : 
     795             : 
     796          20 : static int reconfigure_at_keyframe(FlashSV2Context * s, const uint8_t * image,
     797             :                                    int stride)
     798             : {
     799          20 :     int update_palette = 0;
     800             :     int res;
     801          20 :     int block_width  = optimum_block_width (s);
     802          20 :     int block_height = optimum_block_height(s);
     803             : 
     804          20 :     s->rows = (s->image_height + block_height - 1) / block_height;
     805          20 :     s->cols = (s->image_width  + block_width  - 1) / block_width;
     806             : 
     807          20 :     if (block_width != s->block_width || block_height != s->block_height) {
     808           4 :         s->block_width  = block_width;
     809           4 :         s->block_height = block_height;
     810           4 :         if (s->rows * s->cols > s->blocks_size / sizeof(Block)) {
     811           0 :             s->frame_blocks = av_realloc_array(s->frame_blocks, s->rows, s->cols * sizeof(Block));
     812           0 :             s->key_blocks = av_realloc_array(s->key_blocks, s->cols, s->rows * sizeof(Block));
     813           0 :             if (!s->frame_blocks || !s->key_blocks) {
     814           0 :                 av_log(s->avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
     815           0 :                 return -1;
     816             :             }
     817           0 :             s->blocks_size = s->rows * s->cols * sizeof(Block);
     818             :         }
     819           4 :         init_blocks(s, s->frame_blocks, s->encbuffer, s->databuffer);
     820           4 :         init_blocks(s, s->key_blocks, s->keybuffer, 0);
     821             : 
     822           4 :         av_fast_malloc(&s->blockbuffer, &s->blockbuffer_size, block_width * block_height * 6);
     823           4 :         if (!s->blockbuffer) {
     824           0 :             av_log(s->avctx, AV_LOG_ERROR, "Could not allocate block buffer.\n");
     825           0 :             return AVERROR(ENOMEM);
     826             :         }
     827             :     }
     828             : 
     829          20 :     s->use15_7 = optimum_use15_7(s);
     830          20 :     if (s->use15_7) {
     831          20 :         if ((s->use_custom_palette && s->palette_type != 1) || update_palette) {
     832           0 :             res = generate_optimum_palette(&s->palette, image, s->image_width, s->image_height, stride);
     833           0 :             if (res)
     834           0 :                 return res;
     835           0 :             s->palette_type = 1;
     836           0 :             av_log(s->avctx, AV_LOG_DEBUG, "Generated optimum palette\n");
     837          20 :         } else if (!s->use_custom_palette && s->palette_type != 0) {
     838           4 :             res = generate_default_palette(&s->palette);
     839           4 :             if (res)
     840           0 :                 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         200 :     if ((res = ff_alloc_packet2(avctx, pkt, s->frame_size + AV_INPUT_BUFFER_MIN_SIZE, 0)) < 0)
     860           0 :         return res;
     861             : 
     862             :     /* First frame needs to be a keyframe */
     863         200 :     if (avctx->frame_number == 0)
     864           4 :         keyframe = 1;
     865             : 
     866             :     /* Check the placement of keyframes */
     867         200 :     if (avctx->gop_size > 0) {
     868         200 :         if (avctx->frame_number >= s->last_key_frame + avctx->gop_size)
     869          16 :             keyframe = 1;
     870             :     }
     871             : 
     872         200 :     if (!keyframe
     873         180 :         && avctx->frame_number > s->last_key_frame + avctx->keyint_min) {
     874           0 :         recommend_keyframe(s, &keyframe);
     875           0 :         if (keyframe)
     876           0 :             av_log(avctx, AV_LOG_DEBUG, "Recommending key frame at frame %d\n", avctx->frame_number);
     877             :     }
     878             : 
     879         200 :     if (keyframe) {
     880          20 :         res = reconfigure_at_keyframe(s, p->data[0], p->linesize[0]);
     881          20 :         if (res)
     882           0 :             return res;
     883             :     }
     884             : 
     885         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         200 :     if (keyframe) {
     891          20 :         new_key_frame(s);
     892          20 :         s->last_key_frame = avctx->frame_number;
     893          20 :         pkt->flags |= AV_PKT_FLAG_KEY;
     894          20 :         av_log(avctx, AV_LOG_DEBUG, "Inserting key frame at frame %d\n", avctx->frame_number);
     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             : AVCodec ff_flashsv2_encoder = {
     913             :     .name           = "flashsv2",
     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 },
     922             : };

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