mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 7615 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
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/*
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* Flash Screen Video encoder |
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* Copyright (C) 2004 Alex Beregszaszi |
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* Copyright (C) 2006 Benjamin Larsson |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/* Encoding development sponsored by http://fh-campuswien.ac.at */ |
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/**
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* @file flashsvenc.c |
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* Flash Screen Video encoder |
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* @author Alex Beregszaszi |
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* @author Benjamin Larsson |
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*/ |
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/* Bitstream description
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* The picture is divided into blocks that are zlib-compressed. |
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* |
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* The decoder is fed complete frames, the frameheader contains: |
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* 4bits of block width |
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* 12bits of frame width |
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* 4bits of block height |
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* 12bits of frame height |
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* |
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* Directly after the header are the compressed blocks. The blocks |
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* have their compressed size represented with 16bits in the beginig. |
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* If the size = 0 then the block is unchanged from the previous frame. |
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* All blocks are decompressed until the buffer is consumed. |
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* |
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* Encoding ideas, a basic encoder would just use a fixed block size. |
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* Block sizes can be multipels of 16, from 16 to 256. The blocks don't |
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* have to be quadratic. A brute force search with a set of different |
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* block sizes should give a better result than to just use a fixed size. |
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*/ |
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/* TODO:
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* Don't reencode the frame in brute force mode if the frame is a dupe. Speed up. |
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* Make the difference check faster. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <zlib.h> |
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#include "common.h" |
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#include "avcodec.h" |
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#include "bitstream.h" |
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#include "bytestream.h" |
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typedef struct FlashSVContext { |
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AVCodecContext *avctx; |
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uint8_t *previous_frame; |
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AVFrame frame; |
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int first_frame; |
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int image_width, image_height; |
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int block_width, block_height; |
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uint8_t* tmpblock; |
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uint8_t* encbuffer; |
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int block_size; |
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z_stream zstream; |
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} FlashSVContext; |
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static int copy_region_enc(uint8_t *sptr, uint8_t *dptr, |
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int dx, int dy, int h, int w, int stride, uint8_t *pfptr) { |
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int i,j; |
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uint8_t *nsptr; |
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uint8_t *npfptr; |
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int diff = 0; |
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for (i = dx+h; i > dx; i--) { |
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nsptr = sptr+(i*stride)+dy*3; |
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npfptr = pfptr+(i*stride)+dy*3; |
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for (j=0 ; j<w*3 ; j++) { |
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diff |=npfptr[j]^nsptr[j]; |
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dptr[j] = nsptr[j]; |
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} |
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dptr += w*3; |
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} |
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if (diff) |
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return 1; |
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return 0; |
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} |
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static int flashsv_encode_init(AVCodecContext *avctx) |
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{ |
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FlashSVContext *s = (FlashSVContext *)avctx->priv_data; |
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s->avctx = avctx; |
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if ((avctx->width > 4095) || (avctx->height > 4095)) { |
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av_log(avctx, AV_LOG_ERROR, "Input dimensions too large, input must be max 4096x4096 !\n"); |
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return -1; |
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} |
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if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) { |
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return -1; |
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} |
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s->first_frame = 1; |
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// Needed if zlib unused or init aborted before deflateInit
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memset(&(s->zstream), 0, sizeof(z_stream)); |
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/*
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s->zstream.zalloc = NULL; //av_malloc;
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s->zstream.zfree = NULL; //av_free;
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s->zstream.opaque = NULL; |
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zret = deflateInit(&(s->zstream), 9); |
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if (zret != Z_OK) { |
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av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); |
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return -1; |
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} |
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*/ |
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s->image_width = avctx->width; |
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s->image_height = avctx->height; |
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s->tmpblock = av_mallocz(3*256*256); |
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s->encbuffer = av_mallocz(s->image_width*s->image_height*3); |
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if (!s->tmpblock || !s->encbuffer) { |
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av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n"); |
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return -1; |
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} |
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return 0; |
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} |
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static int encode_bitstream(FlashSVContext *s, AVFrame *p, uint8_t *buf, int buf_size, |
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int block_width, int block_height, uint8_t *previous_frame, int* I_frame) { |
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PutBitContext pb; |
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int h_blocks, v_blocks, h_part, v_part, i, j; |
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int buf_pos, res; |
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int pred_blocks = 0; |
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init_put_bits(&pb, buf, buf_size*8); |
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put_bits(&pb, 4, (block_width/16)-1); |
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put_bits(&pb, 12, s->image_width); |
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put_bits(&pb, 4, (block_height/16)-1); |
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put_bits(&pb, 12, s->image_height); |
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flush_put_bits(&pb); |
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buf_pos=4; |
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h_blocks = s->image_width / block_width; |
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h_part = s->image_width % block_width; |
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v_blocks = s->image_height / block_height; |
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v_part = s->image_height % block_height; |
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/* loop over all block columns */ |
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for (j = 0; j < v_blocks + (v_part?1:0); j++) |
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{ |
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int hp = j*block_height; // horiz position in frame
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int hs = (j<v_blocks)?block_height:v_part; // size of block
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/* loop over all block rows */ |
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for (i = 0; i < h_blocks + (h_part?1:0); i++) |
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{ |
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int wp = i*block_width; // vert position in frame
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int ws = (i<h_blocks)?block_width:h_part; // size of block
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int ret=Z_OK; |
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uint8_t *ptr; |
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ptr = buf+buf_pos; |
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//copy the block to the temp buffer before compression (if it differs from the previous frame's block)
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res = copy_region_enc(p->data[0], s->tmpblock, s->image_height-(hp+hs+1), wp, hs, ws, p->linesize[0], previous_frame); |
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if (res || *I_frame) { |
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unsigned long zsize; |
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zsize = 3*block_width*block_height; |
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ret = compress2(ptr+2, &zsize, s->tmpblock, 3*ws*hs, 9); |
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//ret = deflateReset(&(s->zstream));
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if (ret != Z_OK) |
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av_log(s->avctx, AV_LOG_ERROR, "error while compressing block %dx%d\n", i, j); |
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/*
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s->zstream.next_in = s->tmpblock; |
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s->zstream.avail_in = 3*ws*hs; |
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s->zstream.total_in = 0; |
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s->zstream.next_out = ptr+2; |
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s->zstream.avail_out = buf_size-buf_pos-2; |
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s->zstream.total_out = 0; |
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ret = deflate(&(s->zstream), Z_FINISH); |
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if ((ret != Z_OK) && (ret != Z_STREAM_END)) |
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av_log(s->avctx, AV_LOG_ERROR, "error while compressing block %dx%d\n", i, j); |
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size = s->zstream.total_out; |
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//av_log(avctx, AV_LOG_INFO, "compressed blocks: %d\n", size);
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*/ |
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bytestream_put_be16(&ptr,(unsigned int)zsize); |
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buf_pos += zsize; |
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//av_log(avctx, AV_LOG_ERROR, "buf_pos = %d\n", buf_pos);
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} else { |
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pred_blocks++; |
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bytestream_put_be16(&ptr,0); |
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} |
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} |
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} |
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if (pred_blocks) |
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*I_frame = 0; |
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else |
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*I_frame = 1; |
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return buf_pos; |
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} |
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static int flashsv_encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void *data) |
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{ |
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FlashSVContext * const s = (FlashSVContext *)avctx->priv_data; |
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AVFrame *pict = data; |
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AVFrame * const p = &s->frame; |
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int res; |
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int I_frame = 0; |
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int opt_w, opt_h; |
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*p = *pict; |
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if (s->first_frame) { |
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s->previous_frame = av_mallocz(p->linesize[0]*s->image_height*3); |
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if (!s->previous_frame) { |
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av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n"); |
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return -1; |
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} |
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I_frame = 1; |
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s->first_frame = 0; |
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} |
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#if 0 |
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int w, h; |
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int optim_sizes[16][16]; |
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int smallest_size; |
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//Try all possible combinations and store the encoded frame sizes
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for (w=1 ; w<17 ; w++) { |
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for (h=1 ; h<17 ; h++) { |
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optim_sizes[w-1][h-1] = encode_bitstream(s, p, s->encbuffer, s->image_width*s->image_height*4, w*16, h*16, s->previous_frame); |
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//av_log(avctx, AV_LOG_ERROR, "[%d][%d]size = %d\n",w,h,optim_sizes[w-1][h-1]);
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} |
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} |
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//Search for the smallest framesize and encode the frame with those parameters
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smallest_size=optim_sizes[0][0]; |
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opt_w = 0; |
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opt_h = 0; |
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for (w=0 ; w<16 ; w++) { |
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for (h=0 ; h<16 ; h++) { |
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if (optim_sizes[w][h] < smallest_size) { |
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smallest_size = optim_sizes[w][h]; |
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opt_w = w; |
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opt_h = h; |
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} |
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} |
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} |
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res = encode_bitstream(s, p, buf, buf_size, (opt_w+1)*16, (opt_h+1)*16, s->previous_frame); |
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av_log(avctx, AV_LOG_ERROR, "[%d][%d]optimal size = %d, res = %d|\n", opt_w, opt_h, smallest_size, res); |
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if (buf_size < res) |
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av_log(avctx, AV_LOG_ERROR, "buf_size %d < res %d\n", buf_size, res); |
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#else |
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opt_w=1; |
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opt_h=1; |
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if (buf_size < s->image_width*s->image_height*3) { |
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//Conservative upper bound check for compressed data
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av_log(avctx, AV_LOG_ERROR, "buf_size %d < %d\n", buf_size, s->image_width*s->image_height*3); |
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return -1; |
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} |
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res = encode_bitstream(s, p, buf, buf_size, opt_w*16, opt_h*16, s->previous_frame, &I_frame); |
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#endif |
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//save the current frame
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memcpy(s->previous_frame, p->data[0], s->image_height*p->linesize[0]*3); |
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//mark the frame type so the muxer can mux it correctly
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if (I_frame) { |
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p->pict_type = FF_I_TYPE; |
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p->key_frame = 1; |
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} else { |
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p->pict_type = FF_P_TYPE; |
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p->key_frame = 0; |
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} |
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avctx->coded_frame = p; |
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return res; |
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} |
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static int flashsv_encode_end(AVCodecContext *avctx) |
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{ |
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FlashSVContext *s = (FlashSVContext *)avctx->priv_data; |
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deflateEnd(&(s->zstream)); |
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av_free(s->encbuffer); |
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av_free(s->previous_frame); |
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av_free(s->tmpblock); |
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return 0; |
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} |
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AVCodec flashsv_encoder = { |
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"flashsv", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_FLASHSV, |
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sizeof(FlashSVContext), |
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flashsv_encode_init, |
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flashsv_encode_frame, |
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flashsv_encode_end, |
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.pix_fmts = (enum PixelFormat[]){PIX_FMT_BGR24, -1}, |
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}; |
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