| /* |
| * 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; |
| 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 4095x4095 !\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); |
| |
| 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) |
| { |
| #define ABSDIFF(a,b) (abs((int)(a)-(int)(b))) |
| |
| unsigned int t1 = (c1 & 0x000000ff) + ((c1 & 0x0000ff00) >> 8) + ((c1 & 0x00ff0000) >> 16); |
| unsigned int t2 = (c2 & 0x000000ff) + ((c2 & 0x0000ff00) >> 8) + ((c2 & 0x00ff0000) >> 16); |
| |
| return ABSDIFF(t1, t2) + ABSDIFF(c1 & 0x000000ff, c2 & 0x000000ff) + |
| ABSDIFF((c1 & 0x0000ff00) >> 8 , (c2 & 0x0000ff00) >> 8) + |
| ABSDIFF((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 |
| } |
| |
| #ifndef FLASHSV2_DUMB |
| static const double block_size_fraction = 1.0 / 300; |
| static const double use15_7_threshold = 8192; |
| static const double color15_7_factor = 100; |
| #endif |
| 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 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 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_array(s->frame_blocks, s->rows, s->cols * sizeof(Block)); |
| s->key_blocks = av_realloc_array(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 *p, int *got_packet) |
| { |
| FlashSV2Context *const s = avctx->priv_data; |
| int res; |
| int keyframe = 0; |
| |
| if ((res = ff_alloc_packet2(avctx, pkt, s->frame_size + AV_INPUT_BUFFER_MIN_SIZE, 0)) < 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); |
| 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); |
| } |
| |
| 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", |
| .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video Version 2"), |
| .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 }, |
| }; |
