Commit 053185c2 authored by Benjamin Larsson's avatar Benjamin Larsson

Flash screen video encoder.

Originally committed as revision 7615 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 434f2c18
......@@ -118,7 +118,7 @@ Codecs:
ffv1.c Michael Niedermayer
flac.c Alex Beregszaszi
flacenc.c Justin Ruggles
flashsv.c Benjamin Larsson
flashsv* Benjamin Larsson
flicvideo.c Mike Melanson
g726.c Roman Shaposhnik
gifdec.c Baptiste Coudurier
......
......@@ -245,6 +245,7 @@ OBJS-$(CONFIG_ADPCM_YAMAHA_ENCODER) += adpcm.o
# external dependencies
ifeq ($(CONFIG_ZLIB),yes)
OBJS-$(CONFIG_FLASHSV_DECODER) += flashsv.o
OBJS-$(CONFIG_FLASHSV_ENCODER) += flashsvenc.o
endif
# external codec libraries
......
......@@ -66,7 +66,7 @@ void avcodec_register_all(void)
REGISTER_ENCDEC (FFV1, ffv1);
REGISTER_ENCDEC (FFVHUFF, ffvhuff);
#ifdef CONFIG_ZLIB
REGISTER_DECODER(FLASHSV, flashsv);
REGISTER_ENCDEC (FLASHSV, flashsv);
#endif
REGISTER_DECODER(FLIC, flic);
REGISTER_ENCDEC (FLV, flv);
......
......@@ -37,8 +37,8 @@ extern "C" {
#define AV_STRINGIFY(s) AV_TOSTRING(s)
#define AV_TOSTRING(s) #s
#define LIBAVCODEC_VERSION_INT ((51<<16)+(28<<8)+0)
#define LIBAVCODEC_VERSION 51.28.0
#define LIBAVCODEC_VERSION_INT ((51<<16)+(29<<8)+0)
#define LIBAVCODEC_VERSION 51.29.0
#define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
#define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
......@@ -2189,6 +2189,7 @@ extern AVCodec sonic_encoder;
extern AVCodec sonic_ls_encoder;
extern AVCodec svq1_encoder;
extern AVCodec x264_encoder;
extern AVCodec flashsv_encoder;
extern AVCodec gif_decoder;
extern AVCodec h263_decoder;
......
/*
* Flash Screen Video encoder
* Copyright (C) 2004 Alex Beregszaszi
* Copyright (C) 2006 Benjamin Larsson
*
* 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
*/
/* Encoding development sponsored by http://fh-campuswien.ac.at */
/**
* @file flashsvenc.c
* Flash Screen Video encoder
* @author Alex Beregszaszi
* @author Benjamin Larsson
*/
/* Bitstream description
* The picture is divided into blocks that are zlib-compressed.
*
* The decoder is fed complete frames, the frameheader contains:
* 4bits of block width
* 12bits of frame width
* 4bits of block height
* 12bits of frame height
*
* Directly after the header are the compressed blocks. The blocks
* have their compressed size represented with 16bits in the beginig.
* If the size = 0 then the block is unchanged from the previous frame.
* All blocks are decompressed until the buffer is consumed.
*
* Encoding ideas, a basic encoder would just use a fixed block size.
* Block sizes can be multipels of 16, from 16 to 256. The blocks don't
* have to be quadratic. A brute force search with a set of different
* block sizes should give a better result than to just use a fixed size.
*/
/* TODO:
* Don't reencode the frame in brute force mode if the frame is a dupe. Speed up.
* Make the difference check faster.
*/
#include <stdio.h>
#include <stdlib.h>
#include <zlib.h>
#include "common.h"
#include "avcodec.h"
#include "bitstream.h"
#include "bytestream.h"
typedef struct FlashSVContext {
AVCodecContext *avctx;
uint8_t *previous_frame;
AVFrame frame;
int first_frame;
int image_width, image_height;
int block_width, block_height;
uint8_t* tmpblock;
uint8_t* encbuffer;
int block_size;
z_stream zstream;
} FlashSVContext;
static int copy_region_enc(uint8_t *sptr, uint8_t *dptr,
int dx, int dy, int h, int w, int stride, uint8_t *pfptr) {
int i,j;
uint8_t *nsptr;
uint8_t *npfptr;
int diff = 0;
for (i = dx+h; i > dx; i--) {
nsptr = sptr+(i*stride)+dy*3;
npfptr = pfptr+(i*stride)+dy*3;
for (j=0 ; j<w*3 ; j++) {
diff |=npfptr[j]^nsptr[j];
dptr[j] = nsptr[j];
}
dptr += w*3;
}
if (diff)
return 1;
return 0;
}
static int flashsv_encode_init(AVCodecContext *avctx)
{
FlashSVContext *s = (FlashSVContext *)avctx->priv_data;
s->avctx = avctx;
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 (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
return -1;
}
s->first_frame = 1;
// Needed if zlib unused or init aborted before deflateInit
memset(&(s->zstream), 0, sizeof(z_stream));
/*
s->zstream.zalloc = NULL; //av_malloc;
s->zstream.zfree = NULL; //av_free;
s->zstream.opaque = NULL;
zret = deflateInit(&(s->zstream), 9);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
return -1;
}
*/
s->image_width = avctx->width;
s->image_height = avctx->height;
s->tmpblock = av_mallocz(3*256*256);
s->encbuffer = av_mallocz(s->image_width*s->image_height*3);
if (!s->tmpblock || !s->encbuffer) {
av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
return -1;
}
return 0;
}
static int encode_bitstream(FlashSVContext *s, AVFrame *p, uint8_t *buf, int buf_size,
int block_width, int block_height, uint8_t *previous_frame, int* I_frame) {
PutBitContext pb;
int h_blocks, v_blocks, h_part, v_part, i, j;
int buf_pos, res;
int pred_blocks = 0;
init_put_bits(&pb, buf, buf_size*8);
put_bits(&pb, 4, (block_width/16)-1);
put_bits(&pb, 12, s->image_width);
put_bits(&pb, 4, (block_height/16)-1);
put_bits(&pb, 12, s->image_height);
flush_put_bits(&pb);
buf_pos=4;
h_blocks = s->image_width / block_width;
h_part = s->image_width % block_width;
v_blocks = s->image_height / block_height;
v_part = s->image_height % block_height;
/* loop over all block columns */
for (j = 0; j < v_blocks + (v_part?1:0); j++)
{
int hp = j*block_height; // horiz position in frame
int hs = (j<v_blocks)?block_height:v_part; // size of block
/* loop over all block rows */
for (i = 0; i < h_blocks + (h_part?1:0); i++)
{
int wp = i*block_width; // vert position in frame
int ws = (i<h_blocks)?block_width:h_part; // size of block
int ret=Z_OK;
uint8_t *ptr;
ptr = buf+buf_pos;
//copy the block to the temp buffer before compression (if it differs from the previous frame's block)
res = copy_region_enc(p->data[0], s->tmpblock, s->image_height-(hp+hs+1), wp, hs, ws, p->linesize[0], previous_frame);
if (res || *I_frame) {
unsigned long zsize;
zsize = 3*block_width*block_height;
ret = compress2(ptr+2, &zsize, s->tmpblock, 3*ws*hs, 9);
//ret = deflateReset(&(s->zstream));
if (ret != Z_OK)
av_log(s->avctx, AV_LOG_ERROR, "error while compressing block %dx%d\n", i, j);
/*
s->zstream.next_in = s->tmpblock;
s->zstream.avail_in = 3*ws*hs;
s->zstream.total_in = 0;
s->zstream.next_out = ptr+2;
s->zstream.avail_out = buf_size-buf_pos-2;
s->zstream.total_out = 0;
ret = deflate(&(s->zstream), Z_FINISH);
if ((ret != Z_OK) && (ret != Z_STREAM_END))
av_log(s->avctx, AV_LOG_ERROR, "error while compressing block %dx%d\n", i, j);
size = s->zstream.total_out;
//av_log(avctx, AV_LOG_INFO, "compressed blocks: %d\n", size);
*/
bytestream_put_be16(&ptr,(unsigned int)zsize);
buf_pos += zsize;
//av_log(avctx, AV_LOG_ERROR, "buf_pos = %d\n", buf_pos);
} else {
pred_blocks++;
bytestream_put_be16(&ptr,0);
}
}
}
if (pred_blocks)
*I_frame = 0;
else
*I_frame = 1;
return buf_pos;
}
static int flashsv_encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void *data)
{
FlashSVContext * const s = (FlashSVContext *)avctx->priv_data;
AVFrame *pict = data;
AVFrame * const p = &s->frame;
int res;
int I_frame = 0;
int opt_w, opt_h;
*p = *pict;
if (s->first_frame) {
s->previous_frame = av_mallocz(p->linesize[0]*s->image_height*3);
if (!s->previous_frame) {
av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
return -1;
}
I_frame = 1;
s->first_frame = 0;
}
#if 0
int w, h;
int optim_sizes[16][16];
int smallest_size;
//Try all possible combinations and store the encoded frame sizes
for (w=1 ; w<17 ; w++) {
for (h=1 ; h<17 ; h++) {
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);
//av_log(avctx, AV_LOG_ERROR, "[%d][%d]size = %d\n",w,h,optim_sizes[w-1][h-1]);
}
}
//Search for the smallest framesize and encode the frame with those parameters
smallest_size=optim_sizes[0][0];
opt_w = 0;
opt_h = 0;
for (w=0 ; w<16 ; w++) {
for (h=0 ; h<16 ; h++) {
if (optim_sizes[w][h] < smallest_size) {
smallest_size = optim_sizes[w][h];
opt_w = w;
opt_h = h;
}
}
}
res = encode_bitstream(s, p, buf, buf_size, (opt_w+1)*16, (opt_h+1)*16, s->previous_frame);
av_log(avctx, AV_LOG_ERROR, "[%d][%d]optimal size = %d, res = %d|\n", opt_w, opt_h, smallest_size, res);
if (buf_size < res)
av_log(avctx, AV_LOG_ERROR, "buf_size %d < res %d\n", buf_size, res);
#else
opt_w=1;
opt_h=1;
if (buf_size < s->image_width*s->image_height*3) {
//Conservative upper bound check for compressed data
av_log(avctx, AV_LOG_ERROR, "buf_size %d < %d\n", buf_size, s->image_width*s->image_height*3);
return -1;
}
res = encode_bitstream(s, p, buf, buf_size, opt_w*16, opt_h*16, s->previous_frame, &I_frame);
#endif
//save the current frame
memcpy(s->previous_frame, p->data[0], s->image_height*p->linesize[0]*3);
//mark the frame type so the muxer can mux it correctly
if (I_frame) {
p->pict_type = FF_I_TYPE;
p->key_frame = 1;
} else {
p->pict_type = FF_P_TYPE;
p->key_frame = 0;
}
avctx->coded_frame = p;
return res;
}
static int flashsv_encode_end(AVCodecContext *avctx)
{
FlashSVContext *s = (FlashSVContext *)avctx->priv_data;
deflateEnd(&(s->zstream));
av_free(s->encbuffer);
av_free(s->previous_frame);
av_free(s->tmpblock);
return 0;
}
AVCodec flashsv_encoder = {
"flashsv",
CODEC_TYPE_VIDEO,
CODEC_ID_FLASHSV,
sizeof(FlashSVContext),
flashsv_encode_init,
flashsv_encode_frame,
flashsv_encode_end,
.pix_fmts = (enum PixelFormat[]){PIX_FMT_BGR24, -1},
};
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