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/*
* Copyright (C) 2003 the ffmpeg project
*
* 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 roqvideodec.c
* Id RoQ Video Decoder by Dr. Tim Ferguson
* For more information about the Id RoQ format, visit:
* http://www.csse.monash.edu.au/~timf/
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "avcodec.h"
#include "bytestream.h"
#include "dsputil.h"
#include "roqvideo.h"
#define avg2(a,b) av_clip_uint8(((int)(a)+(int)(b)+1)>>1)
#define avg4(a,b,c,d) av_clip_uint8(((int)(a)+(int)(b)+(int)(c)+(int)(d)+2)>>2)
#define get_byte(in_buffer) *(in_buffer++)
static void roqvideo_decode_frame(RoqContext *ri)
{
unsigned int chunk_id = 0, chunk_arg = 0;
unsigned long chunk_size = 0;
int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
int vqid, bpos, xpos, ypos, xp, yp, x, y, mx, my;
int frame_stats[2][4] = {{0},{0}};
roq_qcell *qcell;
unsigned char *buf = ri->buf;
unsigned char *buf_end = ri->buf + ri->size;
while (buf < buf_end) {
chunk_id = bytestream_get_le16(&buf);
chunk_size = bytestream_get_le32(&buf);
chunk_arg = bytestream_get_le16(&buf);
if(chunk_id == RoQ_QUAD_VQ)
break;
if(chunk_id == RoQ_QUAD_CODEBOOK) {
if((nv1 = chunk_arg >> 8) == 0)
nv1 = 256;
if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
nv2 = 256;
for(i = 0; i < nv1; i++) {
ri->cells[i].y[0] = get_byte(buf);
ri->cells[i].y[1] = get_byte(buf);
ri->cells[i].y[2] = get_byte(buf);
ri->cells[i].y[3] = get_byte(buf);
ri->cells[i].u = get_byte(buf);
ri->cells[i].v = get_byte(buf);
}
for(i = 0; i < nv2; i++)
for(j = 0; j < 4; j++)
ri->qcells[i].idx[j] = get_byte(buf);
}
}
bpos = xpos = ypos = 0;
while(bpos < chunk_size) {
for (yp = ypos; yp < ypos + 16; yp += 8)
for (xp = xpos; xp < xpos + 16; xp += 8) {
if (vqflg_pos < 0) {
vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
vqflg_pos = 7;
}
vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
frame_stats[0][vqid]++;
vqflg_pos--;
switch(vqid) {
case RoQ_ID_MOT:
break;
case RoQ_ID_FCC:
mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
ff_apply_motion_8x8(ri, xp, yp, mx, my);
break;
case RoQ_ID_SLD:
qcell = ri->qcells + buf[bpos++];
ff_apply_vector_4x4(ri, xp, yp, ri->cells + qcell->idx[0]);
ff_apply_vector_4x4(ri, xp+4, yp, ri->cells + qcell->idx[1]);
ff_apply_vector_4x4(ri, xp, yp+4, ri->cells + qcell->idx[2]);
ff_apply_vector_4x4(ri, xp+4, yp+4, ri->cells + qcell->idx[3]);
break;
case RoQ_ID_CCC:
for (k = 0; k < 4; k++) {
x = xp; y = yp;
if(k & 0x01) x += 4;
if(k & 0x02) y += 4;
if (vqflg_pos < 0) {
vqflg = buf[bpos++];
vqflg |= (buf[bpos++] << 8);
vqflg_pos = 7;
}
vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
frame_stats[1][vqid]++;
vqflg_pos--;
switch(vqid) {
case RoQ_ID_MOT:
break;
case RoQ_ID_FCC:
mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
ff_apply_motion_4x4(ri, x, y, mx, my);
break;
case RoQ_ID_SLD:
qcell = ri->qcells + buf[bpos++];
ff_apply_vector_2x2(ri, x, y, ri->cells + qcell->idx[0]);
ff_apply_vector_2x2(ri, x+2, y, ri->cells + qcell->idx[1]);
ff_apply_vector_2x2(ri, x, y+2, ri->cells + qcell->idx[2]);
ff_apply_vector_2x2(ri, x+2, y+2, ri->cells + qcell->idx[3]);
break;
case RoQ_ID_CCC:
ff_apply_vector_2x2(ri, x, y, ri->cells + buf[bpos]);
ff_apply_vector_2x2(ri, x+2, y, ri->cells + buf[bpos+1]);
ff_apply_vector_2x2(ri, x, y+2, ri->cells + buf[bpos+2]);
ff_apply_vector_2x2(ri, x+2, y+2, ri->cells + buf[bpos+3]);
bpos += 4;
break;
}
}
break;
default:
av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
}
}
xpos += 16;
if (xpos >= ri->avctx->width) {
xpos -= ri->avctx->width;
ypos += 16;
}
if(ypos >= ri->avctx->height)
break;
}
}
static int roq_decode_init(AVCodecContext *avctx)
{
RoqContext *s = avctx->priv_data;
s->avctx = avctx;
s->last_frame = &s->frames[0];
s->current_frame = &s->frames[1];
avctx->pix_fmt = PIX_FMT_YUV420P;
dsputil_init(&s->dsp, avctx);
return 0;
}
static int roq_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
RoqContext *s = avctx->priv_data;
if (avctx->reget_buffer(avctx, s->current_frame)) {
av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
return -1;
}
s->y_stride = s->current_frame->linesize[0];
s->c_stride = s->current_frame->linesize[1];
s->buf = buf;
s->size = buf_size;
roqvideo_decode_frame(s);
*data_size = sizeof(AVFrame);
*(AVFrame*)data = *s->current_frame;
/* shuffle frames */
FFSWAP(AVFrame *, s->current_frame, s->last_frame);
return buf_size;
}
static int roq_decode_end(AVCodecContext *avctx)
{
RoqContext *s = avctx->priv_data;
/* release the last frame */
if (s->last_frame->data[0])
avctx->release_buffer(avctx, s->last_frame);
if (s->current_frame->data[0])
avctx->release_buffer(avctx, s->current_frame);
return 0;
}
AVCodec roq_decoder = {
"roqvideo",
CODEC_TYPE_VIDEO,
CODEC_ID_ROQ,
sizeof(RoqContext),
roq_decode_init,
NULL,
roq_decode_end,
roq_decode_frame,
CODEC_CAP_DR1,
};
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