diff options
Diffstat (limited to 'ffmpeg1/libavcodec/flashsv2enc.c')
| -rw-r--r-- | ffmpeg1/libavcodec/flashsv2enc.c | 931 |
1 files changed, 0 insertions, 931 deletions
diff --git a/ffmpeg1/libavcodec/flashsv2enc.c b/ffmpeg1/libavcodec/flashsv2enc.c deleted file mode 100644 index 1d0d196..0000000 --- a/ffmpeg1/libavcodec/flashsv2enc.c +++ /dev/null @@ -1,931 +0,0 @@ -/* - * Flash Screen Video Version 2 encoder - * Copyright (C) 2009 Joshua Warner - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * Flash Screen Video Version 2 encoder - * @author Joshua Warner - */ - -/* Differences from version 1 stream: - * NOTE: Currently, the only player that supports version 2 streams is Adobe Flash Player itself. - * * Supports sending only a range of scanlines in a block, - * indicating a difference from the corresponding block in the last keyframe. - * * Supports initializing the zlib dictionary with data from the corresponding - * block in the last keyframe, to improve compression. - * * Supports a hybrid 15-bit rgb / 7-bit palette color space. - */ - -/* TODO: - * Don't keep Block structures for both current frame and keyframe. - * Make better heuristics for deciding stream parameters (optimum_* functions). Currently these return constants. - * Figure out how to encode palette information in the stream, choose an optimum palette at each keyframe. - * Figure out how the zlibPrimeCompressCurrent flag works, implement support. - * Find other sample files (that weren't generated here), develop a decoder. - */ - -#include <stdio.h> -#include <stdlib.h> -#include <zlib.h> - -#include "libavutil/imgutils.h" -#include "avcodec.h" -#include "internal.h" -#include "put_bits.h" -#include "bytestream.h" - -#define HAS_IFRAME_IMAGE 0x02 -#define HAS_PALLET_INFO 0x01 - -#define COLORSPACE_BGR 0x00 -#define COLORSPACE_15_7 0x10 -#define HAS_DIFF_BLOCKS 0x04 -#define ZLIB_PRIME_COMPRESS_CURRENT 0x02 -#define ZLIB_PRIME_COMPRESS_PREVIOUS 0x01 - -// Disables experimental "smart" parameter-choosing code, as well as the statistics that it depends on. -// At the moment, the "smart" code is a great example of how the parameters *shouldn't* be chosen. -#define FLASHSV2_DUMB - -typedef struct Block { - uint8_t *enc; - uint8_t *sl_begin, *sl_end; - int enc_size; - uint8_t *data; - unsigned long data_size; - - uint8_t start, len; - uint8_t dirty; - uint8_t col, row, width, height; - uint8_t flags; -} Block; - -typedef struct Palette { - unsigned colors[128]; - uint8_t index[1 << 15]; -} Palette; - -typedef struct FlashSV2Context { - AVCodecContext *avctx; - uint8_t *current_frame; - uint8_t *key_frame; - AVFrame frame; - uint8_t *encbuffer; - uint8_t *keybuffer; - uint8_t *databuffer; - - uint8_t *blockbuffer; - int blockbuffer_size; - - Block *frame_blocks; - Block *key_blocks; - int frame_size; - int blocks_size; - - int use15_7, dist, comp; - - int rows, cols; - - int last_key_frame; - - int image_width, image_height; - int block_width, block_height; - uint8_t flags; - uint8_t use_custom_palette; - uint8_t palette_type; ///< 0=>default, 1=>custom - changed when palette regenerated. - Palette palette; -#ifndef FLASHSV2_DUMB - double tot_blocks; ///< blocks encoded since last keyframe - double diff_blocks; ///< blocks that were different since last keyframe - double tot_lines; ///< total scanlines in image since last keyframe - double diff_lines; ///< scanlines that were different since last keyframe - double raw_size; ///< size of raw frames since last keyframe - double comp_size; ///< size of compressed data since last keyframe - double uncomp_size; ///< size of uncompressed data since last keyframe - - double total_bits; ///< total bits written to stream so far -#endif -} FlashSV2Context; - -static av_cold void cleanup(FlashSV2Context * s) -{ - av_freep(&s->encbuffer); - av_freep(&s->keybuffer); - av_freep(&s->databuffer); - av_freep(&s->blockbuffer); - av_freep(&s->current_frame); - av_freep(&s->key_frame); - - av_freep(&s->frame_blocks); - av_freep(&s->key_blocks); -} - -static void init_blocks(FlashSV2Context * s, Block * blocks, - uint8_t * encbuf, uint8_t * databuf) -{ - int row, col; - Block *b; - for (col = 0; col < s->cols; col++) { - for (row = 0; row < s->rows; row++) { - b = blocks + (col + row * s->cols); - b->width = (col < s->cols - 1) ? - s->block_width : - s->image_width - col * s->block_width; - - b->height = (row < s->rows - 1) ? - s->block_height : - s->image_height - row * s->block_height; - - b->row = row; - b->col = col; - b->enc = encbuf; - b->data = databuf; - encbuf += b->width * b->height * 3; - databuf += !databuf ? 0 : b->width * b->height * 6; - } - } -} - -static void reset_stats(FlashSV2Context * s) -{ -#ifndef FLASHSV2_DUMB - s->diff_blocks = 0.1; - s->tot_blocks = 1; - s->diff_lines = 0.1; - s->tot_lines = 1; - s->raw_size = s->comp_size = s->uncomp_size = 10; -#endif -} - -static av_cold int flashsv2_encode_init(AVCodecContext * avctx) -{ - FlashSV2Context *s = avctx->priv_data; - - s->avctx = avctx; - - s->comp = avctx->compression_level; - if (s->comp == -1) - s->comp = 9; - if (s->comp < 0 || s->comp > 9) { - av_log(avctx, AV_LOG_ERROR, - "Compression level should be 0-9, not %d\n", s->comp); - return -1; - } - - - if ((avctx->width > 4095) || (avctx->height > 4095)) { - av_log(avctx, AV_LOG_ERROR, - "Input dimensions too large, input must be max 4096x4096 !\n"); - return -1; - } - if ((avctx->width < 16) || (avctx->height < 16)) { - av_log(avctx, AV_LOG_ERROR, - "Input dimensions too small, input must be at least 16x16 !\n"); - return -1; - } - - if (av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0) - return -1; - - - s->last_key_frame = 0; - - s->image_width = avctx->width; - s->image_height = avctx->height; - - s->block_width = (s->image_width / 12) & ~15; - s->block_height = (s->image_height / 12) & ~15; - - if(!s->block_width) - s->block_width = 1; - if(!s->block_height) - s->block_height = 1; - - s->rows = (s->image_height + s->block_height - 1) / s->block_height; - s->cols = (s->image_width + s->block_width - 1) / s->block_width; - - s->frame_size = s->image_width * s->image_height * 3; - s->blocks_size = s->rows * s->cols * sizeof(Block); - - s->encbuffer = av_mallocz(s->frame_size); - s->keybuffer = av_mallocz(s->frame_size); - s->databuffer = av_mallocz(s->frame_size * 6); - s->current_frame = av_mallocz(s->frame_size); - s->key_frame = av_mallocz(s->frame_size); - s->frame_blocks = av_mallocz(s->blocks_size); - s->key_blocks = av_mallocz(s->blocks_size); - - s->blockbuffer = NULL; - s->blockbuffer_size = 0; - - init_blocks(s, s->frame_blocks, s->encbuffer, s->databuffer); - init_blocks(s, s->key_blocks, s->keybuffer, 0); - reset_stats(s); -#ifndef FLASHSV2_DUMB - s->total_bits = 1; -#endif - - s->use_custom_palette = 0; - s->palette_type = -1; // so that the palette will be generated in reconfigure_at_keyframe - - if (!s->encbuffer || !s->keybuffer || !s->databuffer - || !s->current_frame || !s->key_frame || !s->key_blocks - || !s->frame_blocks) { - av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n"); - cleanup(s); - return -1; - } - - return 0; -} - -static int new_key_frame(FlashSV2Context * s) -{ - int i; - memcpy(s->key_blocks, s->frame_blocks, s->blocks_size); - memcpy(s->key_frame, s->current_frame, s->frame_size); - - for (i = 0; i < s->rows * s->cols; i++) { - s->key_blocks[i].enc += (s->keybuffer - s->encbuffer); - s->key_blocks[i].sl_begin = 0; - s->key_blocks[i].sl_end = 0; - s->key_blocks[i].data = 0; - } - memcpy(s->keybuffer, s->encbuffer, s->frame_size); - - return 0; -} - -static int write_palette(FlashSV2Context * s, uint8_t * buf, int buf_size) -{ - //this isn't implemented yet! Default palette only! - return -1; -} - -static int write_header(FlashSV2Context * s, uint8_t * buf, int buf_size) -{ - PutBitContext pb; - int buf_pos, len; - - if (buf_size < 5) - return -1; - - init_put_bits(&pb, buf, buf_size * 8); - - put_bits(&pb, 4, (s->block_width >> 4) - 1); - put_bits(&pb, 12, s->image_width); - put_bits(&pb, 4, (s->block_height >> 4) - 1); - put_bits(&pb, 12, s->image_height); - - flush_put_bits(&pb); - buf_pos = 4; - - buf[buf_pos++] = s->flags; - - if (s->flags & HAS_PALLET_INFO) { - len = write_palette(s, buf + buf_pos, buf_size - buf_pos); - if (len < 0) - return -1; - buf_pos += len; - } - - return buf_pos; -} - -static int write_block(Block * b, uint8_t * buf, int buf_size) -{ - int buf_pos = 0; - unsigned block_size = b->data_size; - - if (b->flags & HAS_DIFF_BLOCKS) - block_size += 2; - if (b->flags & ZLIB_PRIME_COMPRESS_CURRENT) - block_size += 2; - if (block_size > 0) - block_size += 1; - if (buf_size < block_size + 2) - return -1; - - buf[buf_pos++] = block_size >> 8; - buf[buf_pos++] = block_size; - - if (block_size == 0) - return buf_pos; - - buf[buf_pos++] = b->flags; - - if (b->flags & HAS_DIFF_BLOCKS) { - buf[buf_pos++] = (b->start); - buf[buf_pos++] = (b->len); - } - - if (b->flags & ZLIB_PRIME_COMPRESS_CURRENT) { - //This feature of the format is poorly understood, and as of now, unused. - buf[buf_pos++] = (b->col); - buf[buf_pos++] = (b->row); - } - - memcpy(buf + buf_pos, b->data, b->data_size); - - buf_pos += b->data_size; - - return buf_pos; -} - -static int encode_zlib(Block * b, uint8_t * buf, unsigned long *buf_size, int comp) -{ - int res = compress2(buf, buf_size, b->sl_begin, b->sl_end - b->sl_begin, comp); - return res == Z_OK ? 0 : -1; -} - -static int encode_zlibprime(Block * b, Block * prime, uint8_t * buf, - int *buf_size, int comp) -{ - z_stream s; - int res; - s.zalloc = NULL; - s.zfree = NULL; - s.opaque = NULL; - res = deflateInit(&s, comp); - if (res < 0) - return -1; - - s.next_in = prime->enc; - s.avail_in = prime->enc_size; - while (s.avail_in > 0) { - s.next_out = buf; - s.avail_out = *buf_size; - res = deflate(&s, Z_SYNC_FLUSH); - if (res < 0) - return -1; - } - - s.next_in = b->sl_begin; - s.avail_in = b->sl_end - b->sl_begin; - s.next_out = buf; - s.avail_out = *buf_size; - res = deflate(&s, Z_FINISH); - deflateEnd(&s); - *buf_size -= s.avail_out; - if (res != Z_STREAM_END) - return -1; - return 0; -} - -static int encode_bgr(Block * b, const uint8_t * src, int stride) -{ - int i; - uint8_t *ptr = b->enc; - for (i = 0; i < b->start; i++) - memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3); - b->sl_begin = ptr + i * b->width * 3; - for (; i < b->start + b->len; i++) - memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3); - b->sl_end = ptr + i * b->width * 3; - for (; i < b->height; i++) - memcpy(ptr + i * b->width * 3, src + i * stride, b->width * 3); - b->enc_size = ptr + i * b->width * 3 - b->enc; - return b->enc_size; -} - -static inline unsigned pixel_color15(const uint8_t * src) -{ - return (src[0] >> 3) | ((src[1] & 0xf8) << 2) | ((src[2] & 0xf8) << 7); -} - -static inline unsigned int chroma_diff(unsigned int c1, unsigned int c2) -{ - unsigned int t1 = (c1 & 0x000000ff) + ((c1 & 0x0000ff00) >> 8) + ((c1 & 0x00ff0000) >> 16); - unsigned int t2 = (c2 & 0x000000ff) + ((c2 & 0x0000ff00) >> 8) + ((c2 & 0x00ff0000) >> 16); - - return abs(t1 - t2) + abs((c1 & 0x000000ff) - (c2 & 0x000000ff)) + - abs(((c1 & 0x0000ff00) >> 8) - ((c2 & 0x0000ff00) >> 8)) + - abs(((c1 & 0x00ff0000) >> 16) - ((c2 & 0x00ff0000) >> 16)); -} - -static inline int pixel_color7_fast(Palette * palette, unsigned c15) -{ - return palette->index[c15]; -} - -static int pixel_color7_slow(Palette * palette, unsigned color) -{ - int i, min = 0x7fffffff; - int minc = -1; - for (i = 0; i < 128; i++) { - int c1 = palette->colors[i]; - int diff = chroma_diff(c1, color); - if (diff < min) { - min = diff; - minc = i; - } - } - return minc; -} - -static inline unsigned pixel_bgr(const uint8_t * src) -{ - return (src[0]) | (src[1] << 8) | (src[2] << 16); -} - -static int write_pixel_15_7(Palette * palette, uint8_t * dest, const uint8_t * src, - int dist) -{ - unsigned c15 = pixel_color15(src); - unsigned color = pixel_bgr(src); - int d15 = chroma_diff(color, color & 0x00f8f8f8); - int c7 = pixel_color7_fast(palette, c15); - int d7 = chroma_diff(color, palette->colors[c7]); - if (dist + d15 >= d7) { - dest[0] = c7; - return 1; - } else { - dest[0] = 0x80 | (c15 >> 8); - dest[1] = c15 & 0xff; - return 2; - } -} - -static int update_palette_index(Palette * palette) -{ - int r, g, b; - unsigned int bgr, c15, index; - for (r = 4; r < 256; r += 8) { - for (g = 4; g < 256; g += 8) { - for (b = 4; b < 256; b += 8) { - bgr = b | (g << 8) | (r << 16); - c15 = (b >> 3) | ((g & 0xf8) << 2) | ((r & 0xf8) << 7); - index = pixel_color7_slow(palette, bgr); - - palette->index[c15] = index; - } - } - } - return 0; -} - -static const unsigned int default_screen_video_v2_palette[128] = { - 0x00000000, 0x00333333, 0x00666666, 0x00999999, 0x00CCCCCC, 0x00FFFFFF, - 0x00330000, 0x00660000, 0x00990000, 0x00CC0000, 0x00FF0000, 0x00003300, - 0x00006600, 0x00009900, 0x0000CC00, 0x0000FF00, 0x00000033, 0x00000066, - 0x00000099, 0x000000CC, 0x000000FF, 0x00333300, 0x00666600, 0x00999900, - 0x00CCCC00, 0x00FFFF00, 0x00003333, 0x00006666, 0x00009999, 0x0000CCCC, - 0x0000FFFF, 0x00330033, 0x00660066, 0x00990099, 0x00CC00CC, 0x00FF00FF, - 0x00FFFF33, 0x00FFFF66, 0x00FFFF99, 0x00FFFFCC, 0x00FF33FF, 0x00FF66FF, - 0x00FF99FF, 0x00FFCCFF, 0x0033FFFF, 0x0066FFFF, 0x0099FFFF, 0x00CCFFFF, - 0x00CCCC33, 0x00CCCC66, 0x00CCCC99, 0x00CCCCFF, 0x00CC33CC, 0x00CC66CC, - 0x00CC99CC, 0x00CCFFCC, 0x0033CCCC, 0x0066CCCC, 0x0099CCCC, 0x00FFCCCC, - 0x00999933, 0x00999966, 0x009999CC, 0x009999FF, 0x00993399, 0x00996699, - 0x0099CC99, 0x0099FF99, 0x00339999, 0x00669999, 0x00CC9999, 0x00FF9999, - 0x00666633, 0x00666699, 0x006666CC, 0x006666FF, 0x00663366, 0x00669966, - 0x0066CC66, 0x0066FF66, 0x00336666, 0x00996666, 0x00CC6666, 0x00FF6666, - 0x00333366, 0x00333399, 0x003333CC, 0x003333FF, 0x00336633, 0x00339933, - 0x0033CC33, 0x0033FF33, 0x00663333, 0x00993333, 0x00CC3333, 0x00FF3333, - 0x00003366, 0x00336600, 0x00660033, 0x00006633, 0x00330066, 0x00663300, - 0x00336699, 0x00669933, 0x00993366, 0x00339966, 0x00663399, 0x00996633, - 0x006699CC, 0x0099CC66, 0x00CC6699, 0x0066CC99, 0x009966CC, 0x00CC9966, - 0x0099CCFF, 0x00CCFF99, 0x00FF99CC, 0x0099FFCC, 0x00CC99FF, 0x00FFCC99, - 0x00111111, 0x00222222, 0x00444444, 0x00555555, 0x00AAAAAA, 0x00BBBBBB, - 0x00DDDDDD, 0x00EEEEEE -}; - -static int generate_default_palette(Palette * palette) -{ - memcpy(palette->colors, default_screen_video_v2_palette, - sizeof(default_screen_video_v2_palette)); - - return update_palette_index(palette); -} - -static int generate_optimum_palette(Palette * palette, const uint8_t * image, - int width, int height, int stride) -{ - //this isn't implemented yet! Default palette only! - return -1; -} - -static inline int encode_15_7_sl(Palette * palette, uint8_t * dest, - const uint8_t * src, int width, int dist) -{ - int len = 0, x; - for (x = 0; x < width; x++) { - len += write_pixel_15_7(palette, dest + len, src + 3 * x, dist); - } - return len; -} - -static int encode_15_7(Palette * palette, Block * b, const uint8_t * src, - int stride, int dist) -{ - int i; - uint8_t *ptr = b->enc; - for (i = 0; i < b->start; i++) - ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist); - b->sl_begin = ptr; - for (; i < b->start + b->len; i++) - ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist); - b->sl_end = ptr; - for (; i < b->height; i++) - ptr += encode_15_7_sl(palette, ptr, src + i * stride, b->width, dist); - b->enc_size = ptr - b->enc; - return b->enc_size; -} - -static int encode_block(FlashSV2Context *s, Palette * palette, Block * b, - Block * prev, const uint8_t * src, int stride, int comp, - int dist, int keyframe) -{ - unsigned buf_size = b->width * b->height * 6; - uint8_t *buf = s->blockbuffer; - int res; - - if (b->flags & COLORSPACE_15_7) { - encode_15_7(palette, b, src, stride, dist); - } else { - encode_bgr(b, src, stride); - } - - if (b->len > 0) { - b->data_size = buf_size; - res = encode_zlib(b, b->data, &b->data_size, comp); - if (res) - return res; - - if (!keyframe) { - res = encode_zlibprime(b, prev, buf, &buf_size, comp); - if (res) - return res; - - if (buf_size < b->data_size) { - b->data_size = buf_size; - memcpy(b->data, buf, buf_size); - b->flags |= ZLIB_PRIME_COMPRESS_PREVIOUS; - } - } - } else { - b->data_size = 0; - } - return 0; -} - -static int compare_sl(FlashSV2Context * s, Block * b, const uint8_t * src, - uint8_t * frame, uint8_t * key, int y, int keyframe) -{ - if (memcmp(src, frame, b->width * 3) != 0) { - b->dirty = 1; - memcpy(frame, src, b->width * 3); -#ifndef FLASHSV2_DUMB - s->diff_lines++; -#endif - } - if (memcmp(src, key, b->width * 3) != 0) { - if (b->len == 0) - b->start = y; - b->len = y + 1 - b->start; - } - return 0; -} - -static int mark_all_blocks(FlashSV2Context * s, const uint8_t * src, int stride, - int keyframe) -{ - int sl, rsl, col, pos, possl; - Block *b; - for (sl = s->image_height - 1; sl >= 0; sl--) { - for (col = 0; col < s->cols; col++) { - rsl = s->image_height - sl - 1; - b = s->frame_blocks + col + rsl / s->block_height * s->cols; - possl = stride * sl + col * s->block_width * 3; - pos = s->image_width * rsl * 3 + col * s->block_width * 3; - compare_sl(s, b, src + possl, s->current_frame + pos, - s->key_frame + pos, rsl % s->block_height, keyframe); - } - } -#ifndef FLASHSV2_DUMB - s->tot_lines += s->image_height * s->cols; -#endif - return 0; -} - -static int encode_all_blocks(FlashSV2Context * s, int keyframe) -{ - int row, col, res; - uint8_t *data; - Block *b, *prev; - for (row = 0; row < s->rows; row++) { - for (col = 0; col < s->cols; col++) { - b = s->frame_blocks + (row * s->cols + col); - prev = s->key_blocks + (row * s->cols + col); - b->flags = s->use15_7 ? COLORSPACE_15_7 : 0; - if (keyframe) { - b->start = 0; - b->len = b->height; - } else if (!b->dirty) { - b->start = 0; - b->len = 0; - b->data_size = 0; - continue; - } else if (b->start != 0 || b->len != b->height) { - b->flags |= HAS_DIFF_BLOCKS; - } - data = s->current_frame + s->image_width * 3 * s->block_height * row + s->block_width * col * 3; - res = encode_block(s, &s->palette, b, prev, data, s->image_width * 3, s->comp, s->dist, keyframe); -#ifndef FLASHSV2_DUMB - if (b->dirty) - s->diff_blocks++; - s->comp_size += b->data_size; - s->uncomp_size += b->enc_size; -#endif - if (res) - return res; - } - } -#ifndef FLASHSV2_DUMB - s->raw_size += s->image_width * s->image_height * 3; - s->tot_blocks += s->rows * s->cols; -#endif - return 0; -} - -static int write_all_blocks(FlashSV2Context * s, uint8_t * buf, - int buf_size) -{ - int row, col, buf_pos = 0, len; - Block *b; - for (row = 0; row < s->rows; row++) { - for (col = 0; col < s->cols; col++) { - b = s->frame_blocks + row * s->cols + col; - len = write_block(b, buf + buf_pos, buf_size - buf_pos); - b->start = b->len = b->dirty = 0; - if (len < 0) - return len; - buf_pos += len; - } - } - return buf_pos; -} - -static int write_bitstream(FlashSV2Context * s, const uint8_t * src, int stride, - uint8_t * buf, int buf_size, int keyframe) -{ - int buf_pos, res; - - res = mark_all_blocks(s, src, stride, keyframe); - if (res) - return res; - res = encode_all_blocks(s, keyframe); - if (res) - return res; - - res = write_header(s, buf, buf_size); - if (res < 0) { - return res; - } else { - buf_pos = res; - } - res = write_all_blocks(s, buf + buf_pos, buf_size - buf_pos); - if (res < 0) - return res; - buf_pos += res; -#ifndef FLASHSV2_DUMB - s->total_bits += ((double) buf_pos) * 8.0; -#endif - - return buf_pos; -} - -static void recommend_keyframe(FlashSV2Context * s, int *keyframe) -{ -#ifndef FLASHSV2_DUMB - double block_ratio, line_ratio, enc_ratio, comp_ratio, data_ratio; - if (s->avctx->gop_size > 0) { - block_ratio = s->diff_blocks / s->tot_blocks; - line_ratio = s->diff_lines / s->tot_lines; - enc_ratio = s->uncomp_size / s->raw_size; - comp_ratio = s->comp_size / s->uncomp_size; - data_ratio = s->comp_size / s->raw_size; - - if ((block_ratio >= 0.5 && line_ratio / block_ratio <= 0.5) || line_ratio >= 0.95) { - *keyframe = 1; - return; - } - } -#else - return; -#endif -} - -static const double block_size_fraction = 1.0 / 300; -static int optimum_block_width(FlashSV2Context * s) -{ -#ifndef FLASHSV2_DUMB - double save = (1-pow(s->diff_lines/s->diff_blocks/s->block_height, 0.5)) * s->comp_size/s->tot_blocks; - double width = block_size_fraction * sqrt(0.5 * save * s->rows * s->cols) * s->image_width; - int pwidth = ((int) width); - return FFCLIP(pwidth & ~15, 256, 16); -#else - return 64; -#endif -} - -static int optimum_block_height(FlashSV2Context * s) -{ -#ifndef FLASHSV2_DUMB - double save = (1-pow(s->diff_lines/s->diff_blocks/s->block_height, 0.5)) * s->comp_size/s->tot_blocks; - double height = block_size_fraction * sqrt(0.5 * save * s->rows * s->cols) * s->image_height; - int pheight = ((int) height); - return FFCLIP(pheight & ~15, 256, 16); -#else - return 64; -#endif -} - -static const double use15_7_threshold = 8192; - -static int optimum_use15_7(FlashSV2Context * s) -{ -#ifndef FLASHSV2_DUMB - double ideal = ((double)(s->avctx->bit_rate * s->avctx->time_base.den * s->avctx->ticks_per_frame)) / - ((double) s->avctx->time_base.num) * s->avctx->frame_number; - if (ideal + use15_7_threshold < s->total_bits) { - return 1; - } else { - return 0; - } -#else - return s->avctx->global_quality == 0; -#endif -} - -static const double color15_7_factor = 100; - -static int optimum_dist(FlashSV2Context * s) -{ -#ifndef FLASHSV2_DUMB - double ideal = - s->avctx->bit_rate * s->avctx->time_base.den * - s->avctx->ticks_per_frame; - int dist = pow((s->total_bits / ideal) * color15_7_factor, 3); - av_log(s->avctx, AV_LOG_DEBUG, "dist: %d\n", dist); - return dist; -#else - return 15; -#endif -} - - -static int reconfigure_at_keyframe(FlashSV2Context * s, const uint8_t * image, - int stride) -{ - int update_palette = 0; - int res; - int block_width = optimum_block_width (s); - int block_height = optimum_block_height(s); - - s->rows = (s->image_height + block_height - 1) / block_height; - s->cols = (s->image_width + block_width - 1) / block_width; - - if (block_width != s->block_width || block_height != s->block_height) { - s->block_width = block_width; - s->block_height = block_height; - if (s->rows * s->cols > s->blocks_size / sizeof(Block)) { - s->frame_blocks = av_realloc(s->frame_blocks, s->rows * s->cols * sizeof(Block)); - s->key_blocks = av_realloc(s->key_blocks, s->cols * s->rows * sizeof(Block)); - if (!s->frame_blocks || !s->key_blocks) { - av_log(s->avctx, AV_LOG_ERROR, "Memory allocation failed.\n"); - return -1; - } - s->blocks_size = s->rows * s->cols * sizeof(Block); - } - init_blocks(s, s->frame_blocks, s->encbuffer, s->databuffer); - init_blocks(s, s->key_blocks, s->keybuffer, 0); - - av_fast_malloc(&s->blockbuffer, &s->blockbuffer_size, block_width * block_height * 6); - if (!s->blockbuffer) { - av_log(s->avctx, AV_LOG_ERROR, "Could not allocate block buffer.\n"); - return AVERROR(ENOMEM); - } - } - - s->use15_7 = optimum_use15_7(s); - if (s->use15_7) { - if ((s->use_custom_palette && s->palette_type != 1) || update_palette) { - res = generate_optimum_palette(&s->palette, image, s->image_width, s->image_height, stride); - if (res) - return res; - s->palette_type = 1; - av_log(s->avctx, AV_LOG_DEBUG, "Generated optimum palette\n"); - } else if (!s->use_custom_palette && s->palette_type != 0) { - res = generate_default_palette(&s->palette); - if (res) - return res; - s->palette_type = 0; - av_log(s->avctx, AV_LOG_DEBUG, "Generated default palette\n"); - } - } - - - reset_stats(s); - - return 0; -} - -static int flashsv2_encode_frame(AVCodecContext *avctx, AVPacket *pkt, - const AVFrame *pict, int *got_packet) -{ - FlashSV2Context *const s = avctx->priv_data; - AVFrame *const p = &s->frame; - int res; - int keyframe = 0; - - *p = *pict; - - if ((res = ff_alloc_packet2(avctx, pkt, s->frame_size + FF_MIN_BUFFER_SIZE)) < 0) - return res; - - /* First frame needs to be a keyframe */ - if (avctx->frame_number == 0) - keyframe = 1; - - /* Check the placement of keyframes */ - if (avctx->gop_size > 0) { - if (avctx->frame_number >= s->last_key_frame + avctx->gop_size) - keyframe = 1; - } - - if (!keyframe - && avctx->frame_number > s->last_key_frame + avctx->keyint_min) { - recommend_keyframe(s, &keyframe); - if (keyframe) - av_log(avctx, AV_LOG_DEBUG, "Recommending key frame at frame %d\n", avctx->frame_number); - } - - if (keyframe) { - res = reconfigure_at_keyframe(s, p->data[0], p->linesize[0]); - if (res) - return res; - } - - if (s->use15_7) - s->dist = optimum_dist(s); - - res = write_bitstream(s, p->data[0], p->linesize[0], pkt->data, pkt->size, keyframe); - - if (keyframe) { - new_key_frame(s); - p->pict_type = AV_PICTURE_TYPE_I; - p->key_frame = 1; - s->last_key_frame = avctx->frame_number; - pkt->flags |= AV_PKT_FLAG_KEY; - av_log(avctx, AV_LOG_DEBUG, "Inserting key frame at frame %d\n", avctx->frame_number); - } else { - p->pict_type = AV_PICTURE_TYPE_P; - p->key_frame = 0; - } - - avctx->coded_frame = p; - - pkt->size = res; - *got_packet = 1; - - return 0; -} - -static av_cold int flashsv2_encode_end(AVCodecContext * avctx) -{ - FlashSV2Context *s = avctx->priv_data; - - cleanup(s); - - return 0; -} - -AVCodec ff_flashsv2_encoder = { - .name = "flashsv2", - .type = AVMEDIA_TYPE_VIDEO, - .id = AV_CODEC_ID_FLASHSV2, - .priv_data_size = sizeof(FlashSV2Context), - .init = flashsv2_encode_init, - .encode2 = flashsv2_encode_frame, - .close = flashsv2_encode_end, - .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE }, - .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video Version 2"), -}; |