305 lines
9.9 KiB
C
Executable file
305 lines
9.9 KiB
C
Executable file
/*
|
|
* Microsoft Video-1 Encoder
|
|
* Copyright (c) 2009 Konstantin Shishkov
|
|
*
|
|
* 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
|
|
* Microsoft Video-1 encoder
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
#include "bytestream.h"
|
|
#include "libavutil/lfg.h"
|
|
#include "elbg.h"
|
|
#include "libavutil/imgutils.h"
|
|
/**
|
|
* Encoder context
|
|
*/
|
|
typedef struct Msvideo1EncContext {
|
|
AVCodecContext *avctx;
|
|
AVLFG rnd;
|
|
uint8_t *prev;
|
|
|
|
int block[16*3];
|
|
int block2[16*3];
|
|
int codebook[8*3];
|
|
int codebook2[8*3];
|
|
int output[16*3];
|
|
int output2[16*3];
|
|
int avg[3];
|
|
int bestpos;
|
|
int keyint;
|
|
} Msvideo1EncContext;
|
|
|
|
enum MSV1Mode{
|
|
MODE_SKIP = 0,
|
|
MODE_FILL,
|
|
MODE_2COL,
|
|
MODE_8COL,
|
|
};
|
|
|
|
#define SKIP_PREFIX 0x8400
|
|
#define SKIPS_MAX 0x03FF
|
|
#define MKRGB555(in, off) (((in)[off] << 10) | ((in)[(off) + 1] << 5) | ((in)[(off) + 2]))
|
|
|
|
static const int remap[16] = { 0, 1, 4, 5, 2, 3, 6, 7, 8, 9, 12, 13, 10, 11, 14, 15 };
|
|
|
|
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
|
|
const AVFrame *pict, int *got_packet)
|
|
{
|
|
Msvideo1EncContext * const c = avctx->priv_data;
|
|
const AVFrame *p = pict;
|
|
uint16_t *src;
|
|
uint8_t *prevptr;
|
|
uint8_t *dst, *buf;
|
|
int keyframe = 0;
|
|
int no_skips = 1;
|
|
int i, j, k, x, y, ret;
|
|
int skips = 0;
|
|
int quality = 24;
|
|
|
|
if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width*avctx->height*9 + AV_INPUT_BUFFER_MIN_SIZE, 0)) < 0)
|
|
return ret;
|
|
dst= buf= pkt->data;
|
|
|
|
if(!c->prev)
|
|
c->prev = av_malloc(avctx->width * 3 * (avctx->height + 3));
|
|
prevptr = c->prev + avctx->width * 3 * (FFALIGN(avctx->height, 4) - 1);
|
|
src = (uint16_t*)(p->data[0] + p->linesize[0]*(FFALIGN(avctx->height, 4) - 1));
|
|
if(c->keyint >= avctx->keyint_min)
|
|
keyframe = 1;
|
|
|
|
|
|
for(y = 0; y < avctx->height; y += 4){
|
|
for(x = 0; x < avctx->width; x += 4){
|
|
int bestmode = MODE_SKIP;
|
|
int bestscore = INT_MAX;
|
|
int flags = 0;
|
|
int score;
|
|
|
|
for(j = 0; j < 4; j++){
|
|
for(i = 0; i < 4; i++){
|
|
uint16_t val = src[x + i - j*p->linesize[0]/2];
|
|
for(k = 0; k < 3; k++){
|
|
c->block[(i + j*4)*3 + k] =
|
|
c->block2[remap[i + j*4]*3 + k] = (val >> (10-k*5)) & 0x1F;
|
|
}
|
|
}
|
|
}
|
|
if(!keyframe){
|
|
bestscore = 0;
|
|
for(j = 0; j < 4; j++){
|
|
for(i = 0; i < 4*3; i++){
|
|
int t = prevptr[x*3 + i - j*3*avctx->width] - c->block[i + j*4*3];
|
|
bestscore += t*t;
|
|
}
|
|
}
|
|
bestscore /= quality;
|
|
}
|
|
// try to find optimal value to fill whole 4x4 block
|
|
score = 0;
|
|
avpriv_init_elbg(c->block, 3, 16, c->avg, 1, 1, c->output, &c->rnd);
|
|
avpriv_do_elbg (c->block, 3, 16, c->avg, 1, 1, c->output, &c->rnd);
|
|
if(c->avg[0] == 1) // red component = 1 will be written as skip code
|
|
c->avg[0] = 0;
|
|
for(j = 0; j < 4; j++){
|
|
for(i = 0; i < 4; i++){
|
|
for(k = 0; k < 3; k++){
|
|
int t = c->avg[k] - c->block[(i+j*4)*3+k];
|
|
score += t*t;
|
|
}
|
|
}
|
|
}
|
|
score /= quality;
|
|
score += 2;
|
|
if(score < bestscore){
|
|
bestscore = score;
|
|
bestmode = MODE_FILL;
|
|
}
|
|
// search for optimal filling of 2-color block
|
|
score = 0;
|
|
avpriv_init_elbg(c->block, 3, 16, c->codebook, 2, 1, c->output, &c->rnd);
|
|
avpriv_do_elbg (c->block, 3, 16, c->codebook, 2, 1, c->output, &c->rnd);
|
|
// last output value should be always 1, swap codebooks if needed
|
|
if(!c->output[15]){
|
|
for(i = 0; i < 3; i++)
|
|
FFSWAP(uint8_t, c->codebook[i], c->codebook[i+3]);
|
|
for(i = 0; i < 16; i++)
|
|
c->output[i] ^= 1;
|
|
}
|
|
for(j = 0; j < 4; j++){
|
|
for(i = 0; i < 4; i++){
|
|
for(k = 0; k < 3; k++){
|
|
int t = c->codebook[c->output[i+j*4]*3 + k] - c->block[i*3+k+j*4*3];
|
|
score += t*t;
|
|
}
|
|
}
|
|
}
|
|
score /= quality;
|
|
score += 6;
|
|
if(score < bestscore){
|
|
bestscore = score;
|
|
bestmode = MODE_2COL;
|
|
}
|
|
// search for optimal filling of 2-color 2x2 subblocks
|
|
score = 0;
|
|
for(i = 0; i < 4; i++){
|
|
avpriv_init_elbg(c->block2 + i*4*3, 3, 4, c->codebook2 + i*2*3, 2, 1, c->output2 + i*4, &c->rnd);
|
|
avpriv_do_elbg (c->block2 + i*4*3, 3, 4, c->codebook2 + i*2*3, 2, 1, c->output2 + i*4, &c->rnd);
|
|
}
|
|
// last value should be always 1, swap codebooks if needed
|
|
if(!c->output2[15]){
|
|
for(i = 0; i < 3; i++)
|
|
FFSWAP(uint8_t, c->codebook2[i+18], c->codebook2[i+21]);
|
|
for(i = 12; i < 16; i++)
|
|
c->output2[i] ^= 1;
|
|
}
|
|
for(j = 0; j < 4; j++){
|
|
for(i = 0; i < 4; i++){
|
|
for(k = 0; k < 3; k++){
|
|
int t = c->codebook2[(c->output2[remap[i+j*4]] + (i&2) + (j&2)*2)*3+k] - c->block[i*3+k + j*4*3];
|
|
score += t*t;
|
|
}
|
|
}
|
|
}
|
|
score /= quality;
|
|
score += 18;
|
|
if(score < bestscore){
|
|
bestscore = score;
|
|
bestmode = MODE_8COL;
|
|
}
|
|
|
|
if(bestmode == MODE_SKIP){
|
|
skips++;
|
|
no_skips = 0;
|
|
}
|
|
if((bestmode != MODE_SKIP && skips) || skips == SKIPS_MAX){
|
|
bytestream_put_le16(&dst, skips | SKIP_PREFIX);
|
|
skips = 0;
|
|
}
|
|
|
|
switch(bestmode){
|
|
case MODE_FILL:
|
|
bytestream_put_le16(&dst, MKRGB555(c->avg,0) | 0x8000);
|
|
for(j = 0; j < 4; j++)
|
|
for(i = 0; i < 4; i++)
|
|
for(k = 0; k < 3; k++)
|
|
prevptr[x*3 + i*3 + k - j*3*avctx->width] = c->avg[k];
|
|
break;
|
|
case MODE_2COL:
|
|
for(j = 0; j < 4; j++){
|
|
for(i = 0; i < 4; i++){
|
|
flags |= (c->output[i + j*4]^1) << (i + j*4);
|
|
for(k = 0; k < 3; k++)
|
|
prevptr[x*3 + i*3 + k - j*3*avctx->width] = c->codebook[c->output[i + j*4]*3 + k];
|
|
}
|
|
}
|
|
bytestream_put_le16(&dst, flags);
|
|
bytestream_put_le16(&dst, MKRGB555(c->codebook, 0));
|
|
bytestream_put_le16(&dst, MKRGB555(c->codebook, 3));
|
|
break;
|
|
case MODE_8COL:
|
|
for(j = 0; j < 4; j++){
|
|
for(i = 0; i < 4; i++){
|
|
flags |= (c->output2[remap[i + j*4]]^1) << (i + j*4);
|
|
for(k = 0; k < 3; k++)
|
|
prevptr[x*3 + i*3 + k - j*3*avctx->width] = c->codebook2[(c->output2[remap[i+j*4]] + (i&2) + (j&2)*2)*3 + k];
|
|
}
|
|
}
|
|
bytestream_put_le16(&dst, flags);
|
|
bytestream_put_le16(&dst, MKRGB555(c->codebook2, 0) | 0x8000);
|
|
for(i = 3; i < 24; i += 3)
|
|
bytestream_put_le16(&dst, MKRGB555(c->codebook2, i));
|
|
break;
|
|
}
|
|
}
|
|
src -= p->linesize[0] << 1;
|
|
prevptr -= avctx->width * 3 * 4;
|
|
}
|
|
if(skips)
|
|
bytestream_put_le16(&dst, skips | SKIP_PREFIX);
|
|
//EOF
|
|
bytestream_put_byte(&dst, 0);
|
|
bytestream_put_byte(&dst, 0);
|
|
|
|
if(no_skips)
|
|
keyframe = 1;
|
|
if(keyframe)
|
|
c->keyint = 0;
|
|
else
|
|
c->keyint++;
|
|
if (keyframe) pkt->flags |= AV_PKT_FLAG_KEY;
|
|
pkt->size = dst - buf;
|
|
*got_packet = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* init encoder
|
|
*/
|
|
static av_cold int encode_init(AVCodecContext *avctx)
|
|
{
|
|
Msvideo1EncContext * const c = avctx->priv_data;
|
|
|
|
c->avctx = avctx;
|
|
if (av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0) {
|
|
return -1;
|
|
}
|
|
if((avctx->width&3) || (avctx->height&3)){
|
|
av_log(avctx, AV_LOG_ERROR, "width and height must be multiples of 4\n");
|
|
return -1;
|
|
}
|
|
|
|
avctx->bits_per_coded_sample = 16;
|
|
|
|
c->keyint = avctx->keyint_min;
|
|
av_lfg_init(&c->rnd, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Uninit encoder
|
|
*/
|
|
static av_cold int encode_end(AVCodecContext *avctx)
|
|
{
|
|
Msvideo1EncContext * const c = avctx->priv_data;
|
|
|
|
av_freep(&c->prev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_msvideo1_encoder = {
|
|
.name = "msvideo1",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Microsoft Video-1"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_MSVIDEO1,
|
|
.priv_data_size = sizeof(Msvideo1EncContext),
|
|
.init = encode_init,
|
|
.encode2 = encode_frame,
|
|
.close = encode_end,
|
|
.pix_fmts = (const enum AVPixelFormat[]){AV_PIX_FMT_RGB555, AV_PIX_FMT_NONE},
|
|
};
|