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ffmpeg/libavcodec/roqvideo.c

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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 roqvideo.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 "common.h"
#include "avcodec.h"
#include "dsputil.h"
typedef struct {
unsigned char y0, y1, y2, y3, u, v;
} roq_cell;
typedef struct {
int idx[4];
} roq_qcell;
static int uiclip[1024], *uiclp; /* clipping table */
#define avg2(a,b) uiclp[(((int)(a)+(int)(b)+1)>>1)]
#define avg4(a,b,c,d) uiclp[(((int)(a)+(int)(b)+(int)(c)+(int)(d)+2)>>2)]
typedef struct RoqContext {
AVCodecContext *avctx;
DSPContext dsp;
AVFrame frames[2];
AVFrame *last_frame;
AVFrame *current_frame;
int first_frame;
int y_stride;
int c_stride;
roq_cell cells[256];
roq_qcell qcells[256];
unsigned char *buf;
int size;
} RoqContext;
#define RoQ_INFO 0x1001
#define RoQ_QUAD_CODEBOOK 0x1002
#define RoQ_QUAD_VQ 0x1011
#define RoQ_SOUND_MONO 0x1020
#define RoQ_SOUND_STEREO 0x1021
#define RoQ_ID_MOT 0x00
#define RoQ_ID_FCC 0x01
#define RoQ_ID_SLD 0x02
#define RoQ_ID_CCC 0x03
#define get_byte(in_buffer) *(in_buffer++)
#define get_word(in_buffer) ((unsigned short)(in_buffer += 2, \
(in_buffer[-1] << 8 | in_buffer[-2])))
#define get_long(in_buffer) ((unsigned long)(in_buffer += 4, \
(in_buffer[-1] << 24 | in_buffer[-2] << 16 | in_buffer[-3] << 8 | in_buffer[-4])))
static void apply_vector_2x2(RoqContext *ri, int x, int y, roq_cell *cell)
{
unsigned char *yptr;
yptr = ri->current_frame->data[0] + (y * ri->y_stride) + x;
*yptr++ = cell->y0;
*yptr++ = cell->y1;
yptr += (ri->y_stride - 2);
*yptr++ = cell->y2;
*yptr++ = cell->y3;
ri->current_frame->data[1][(y/2) * (ri->c_stride) + x/2] = cell->u;
ri->current_frame->data[2][(y/2) * (ri->c_stride) + x/2] = cell->v;
}
static void apply_vector_4x4(RoqContext *ri, int x, int y, roq_cell *cell)
{
unsigned long row_inc, c_row_inc;
register unsigned char y0, y1, u, v;
unsigned char *yptr, *uptr, *vptr;
yptr = ri->current_frame->data[0] + (y * ri->y_stride) + x;
uptr = ri->current_frame->data[1] + (y/2) * (ri->c_stride) + x/2;
vptr = ri->current_frame->data[2] + (y/2) * (ri->c_stride) + x/2;
row_inc = ri->y_stride - 4;
c_row_inc = (ri->c_stride) - 2;
*yptr++ = y0 = cell->y0; *uptr++ = u = cell->u; *vptr++ = v = cell->v;
*yptr++ = y0;
*yptr++ = y1 = cell->y1; *uptr++ = u; *vptr++ = v;
*yptr++ = y1;
yptr += row_inc;
*yptr++ = y0;
*yptr++ = y0;
*yptr++ = y1;
*yptr++ = y1;
yptr += row_inc; uptr += c_row_inc; vptr += c_row_inc;
*yptr++ = y0 = cell->y2; *uptr++ = u; *vptr++ = v;
*yptr++ = y0;
*yptr++ = y1 = cell->y3; *uptr++ = u; *vptr++ = v;
*yptr++ = y1;
yptr += row_inc;
*yptr++ = y0;
*yptr++ = y0;
*yptr++ = y1;
*yptr++ = y1;
}
static void apply_motion_4x4(RoqContext *ri, int x, int y, unsigned char mv,
signed char mean_x, signed char mean_y)
{
int i, hw, mx, my;
unsigned char *pa, *pb;
mx = x + 8 - (mv >> 4) - mean_x;
my = y + 8 - (mv & 0xf) - mean_y;
/* check MV against frame boundaries */
if ((mx < 0) || (mx > ri->avctx->width - 4) ||
(my < 0) || (my > ri->avctx->height - 4)) {
av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
mx, my, ri->avctx->width, ri->avctx->height);
return;
}
pa = ri->current_frame->data[0] + (y * ri->y_stride) + x;
pb = ri->last_frame->data[0] + (my * ri->y_stride) + mx;
for(i = 0; i < 4; i++) {
pa[0] = pb[0];
pa[1] = pb[1];
pa[2] = pb[2];
pa[3] = pb[3];
pa += ri->y_stride;
pb += ri->y_stride;
}
hw = ri->y_stride/2;
pa = ri->current_frame->data[1] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame->data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
for(i = 0; i < 2; i++) {
switch(((my & 0x01) << 1) | (mx & 0x01)) {
case 0:
pa[0] = pb[0];
pa[1] = pb[1];
pa[hw] = pb[hw];
pa[hw+1] = pb[hw+1];
break;
case 1:
pa[0] = avg2(pb[0], pb[1]);
pa[1] = avg2(pb[1], pb[2]);
pa[hw] = avg2(pb[hw], pb[hw+1]);
pa[hw+1] = avg2(pb[hw+1], pb[hw+2]);
break;
case 2:
pa[0] = avg2(pb[0], pb[hw]);
pa[1] = avg2(pb[1], pb[hw+1]);
pa[hw] = avg2(pb[hw], pb[hw*2]);
pa[hw+1] = avg2(pb[hw+1], pb[(hw*2)+1]);
break;
case 3:
pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
pa[hw] = avg4(pb[hw], pb[hw+1], pb[hw*2], pb[(hw*2)+1]);
pa[hw+1] = avg4(pb[hw+1], pb[hw+2], pb[(hw*2)+1], pb[(hw*2)+1]);
break;
}
pa = ri->current_frame->data[2] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame->data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
}
}
static void apply_motion_8x8(RoqContext *ri, int x, int y,
unsigned char mv, signed char mean_x, signed char mean_y)
{
int mx, my, i, j, hw;
unsigned char *pa, *pb;
mx = x + 8 - (mv >> 4) - mean_x;
my = y + 8 - (mv & 0xf) - mean_y;
/* check MV against frame boundaries */
if ((mx < 0) || (mx > ri->avctx->width - 8) ||
(my < 0) || (my > ri->avctx->height - 8)) {
av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
mx, my, ri->avctx->width, ri->avctx->height);
return;
}
pa = ri->current_frame->data[0] + (y * ri->y_stride) + x;
pb = ri->last_frame->data[0] + (my * ri->y_stride) + mx;
for(i = 0; i < 8; i++) {
pa[0] = pb[0];
pa[1] = pb[1];
pa[2] = pb[2];
pa[3] = pb[3];
pa[4] = pb[4];
pa[5] = pb[5];
pa[6] = pb[6];
pa[7] = pb[7];
pa += ri->y_stride;
pb += ri->y_stride;
}
hw = ri->c_stride;
pa = ri->current_frame->data[1] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame->data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
for(j = 0; j < 2; j++) {
for(i = 0; i < 4; i++) {
switch(((my & 0x01) << 1) | (mx & 0x01)) {
case 0:
pa[0] = pb[0];
pa[1] = pb[1];
pa[2] = pb[2];
pa[3] = pb[3];
break;
case 1:
pa[0] = avg2(pb[0], pb[1]);
pa[1] = avg2(pb[1], pb[2]);
pa[2] = avg2(pb[2], pb[3]);
pa[3] = avg2(pb[3], pb[4]);
break;
case 2:
pa[0] = avg2(pb[0], pb[hw]);
pa[1] = avg2(pb[1], pb[hw+1]);
pa[2] = avg2(pb[2], pb[hw+2]);
pa[3] = avg2(pb[3], pb[hw+3]);
break;
case 3:
pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
pa[2] = avg4(pb[2], pb[3], pb[hw+2], pb[hw+3]);
pa[3] = avg4(pb[3], pb[4], pb[hw+3], pb[hw+4]);
break;
}
pa += ri->c_stride;
pb += ri->c_stride;
}
pa = ri->current_frame->data[2] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame->data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
}
}
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;
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 = get_word(buf);
chunk_size = get_long(buf);
chunk_arg = get_word(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].y0 = get_byte(buf);
ri->cells[i].y1 = get_byte(buf);
ri->cells[i].y2 = get_byte(buf);
ri->cells[i].y3 = 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:
apply_motion_8x8(ri, xp, yp, 0, 8, 8);
break;
case RoQ_ID_FCC:
apply_motion_8x8(ri, xp, yp, buf[bpos++], chunk_arg >> 8,
chunk_arg & 0xff);
break;
case RoQ_ID_SLD:
qcell = ri->qcells + buf[bpos++];
apply_vector_4x4(ri, xp, yp, ri->cells + qcell->idx[0]);
apply_vector_4x4(ri, xp+4, yp, ri->cells + qcell->idx[1]);
apply_vector_4x4(ri, xp, yp+4, ri->cells + qcell->idx[2]);
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:
apply_motion_4x4(ri, x, y, 0, 8, 8);
break;
case RoQ_ID_FCC:
apply_motion_4x4(ri, x, y, buf[bpos++],
chunk_arg >> 8, chunk_arg & 0xff);
break;
case RoQ_ID_SLD:
qcell = ri->qcells + buf[bpos++];
apply_vector_2x2(ri, x, y, ri->cells + qcell->idx[0]);
apply_vector_2x2(ri, x+2, y, ri->cells + qcell->idx[1]);
apply_vector_2x2(ri, x, y+2, ri->cells + qcell->idx[2]);
apply_vector_2x2(ri, x+2, y+2, ri->cells + qcell->idx[3]);
break;
case RoQ_ID_CCC:
apply_vector_2x2(ri, x, y, ri->cells + buf[bpos]);
apply_vector_2x2(ri, x+2, y, ri->cells + buf[bpos+1]);
apply_vector_2x2(ri, x, y+2, ri->cells + buf[bpos+2]);
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;
int i;
s->avctx = avctx;
s->first_frame = 1;
s->last_frame = &s->frames[0];
s->current_frame = &s->frames[1];
avctx->pix_fmt = PIX_FMT_YUV420P;
avctx->has_b_frames = 0;
dsputil_init(&s->dsp, avctx);
uiclp = uiclip+512;
for(i = -512; i < 512; i++)
uiclp[i] = (i < 0 ? 0 : (i > 255 ? 255 : i));
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->get_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);
/* release the last frame if it is allocated */
if (s->first_frame)
s->first_frame = 0;
else
avctx->release_buffer(avctx, s->last_frame);
*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);
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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