static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
int *golden_frame)
{
VP56RangeCoder *c = &s->c;
int rows, cols;
vp56_init_range_decoder(&s->c, buf, buf_size);
s->framep[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
vp56_rac_get(c);
vp56_init_dequant(s, vp56_rac_gets(c, 6));
if (s->framep[VP56_FRAME_CURRENT]->key_frame)
{
vp56_rac_gets(c, 8);
if(vp56_rac_gets(c, 5) > 5)
return 0;
vp56_rac_gets(c, 2);
if (vp56_rac_get(c)) {
av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
return 0;
}
rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
vp56_rac_gets(c, 2);
if (!s->macroblocks || /* first frame */
16*cols != s->avctx->coded_width ||
16*rows != s->avctx->coded_height) {
avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
return 2;
}
} else if (!s->macroblocks)
return 0;
return 1;
}
static void vp56_decode_4mv(VP56Context *s, int row, int col)
{
VP56mv mv = {0,0};
int type[4];
int b;
/* parse each block type */
for (b=0; b<4; b++) {
type[b] = vp56_rac_gets(&s->c, 2);
if (type[b])
type[b]++; /* only returns 0, 2, 3 or 4 (all INTER_PF) */
}
/* get vectors */
for (b=0; b<4; b++) {
switch (type[b]) {
case VP56_MB_INTER_NOVEC_PF:
#ifdef IDE_COMPILE
{
VP56mv tmp1 = {0,0};
s->mv[b] = tmp1;
}
#else
s->mv[b] = (VP56mv) {0,0};
#endif
break;
case VP56_MB_INTER_DELTA_PF:
s->parse_vector_adjustment(s, &s->mv[b]);
break;
case VP56_MB_INTER_V1_PF:
s->mv[b] = s->vector_candidate[0];
break;
case VP56_MB_INTER_V2_PF:
s->mv[b] = s->vector_candidate[1];
break;
}
mv.x += s->mv[b].x;
mv.y += s->mv[b].y;
}
/* this is the one selected for the whole MB for prediction */
s->macroblocks[row * s->mb_width + col].mv = s->mv[3];
/* chroma vectors are average luma vectors */
if (s->avctx->codec->id == AV_CODEC_ID_VP5) {
s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);
s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);
} else {
#ifdef IDE_COMPILE
{
VP56mv tmp2 = {mv.x/4, mv.y/4};
s->mv[4] = s->mv[5] = tmp2;
}
#else
s->mv[4] = s->mv[5] = (VP56mv) {mv.x/4, mv.y/4};
#endif
}
}
static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
{
VP56RangeCoder *c = &s->c;
int rows, cols;
ff_vp56_init_range_decoder(&s->c, buf, buf_size);
s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
vp56_rac_get(c);
ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
if (s->frames[VP56_FRAME_CURRENT]->key_frame)
{
vp56_rac_gets(c, 8);
if(vp56_rac_gets(c, 5) > 5)
return AVERROR_INVALIDDATA;
vp56_rac_gets(c, 2);
if (vp56_rac_get(c)) {
av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
return AVERROR_PATCHWELCOME;
}
rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
if (!rows || !cols) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
cols << 4, rows << 4);
return AVERROR_INVALIDDATA;
}
vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
vp56_rac_gets(c, 2);
if (!s->macroblocks || /* first frame */
16*cols != s->avctx->coded_width ||
16*rows != s->avctx->coded_height) {
int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
if (ret < 0)
return ret;
return VP56_SIZE_CHANGE;
}
} else if (!s->macroblocks)
return AVERROR_INVALIDDATA;
return 0;
}
static void vp56_parse_mb_type_models(VP56Context *s)
{
VP56RangeCoder *c = &s->c;
VP56Model *model = s->modelp;
int i, ctx, type;
for (ctx=0; ctx<3; ctx++) {
if (vp56_rac_get_prob(c, 174)) {
int idx = vp56_rac_gets(c, 4);
memcpy(model->mb_types_stats[ctx],
vp56_pre_def_mb_type_stats[idx][ctx],
sizeof(model->mb_types_stats[ctx]));
}
if (vp56_rac_get_prob(c, 254)) {
for (type=0; type<10; type++) {
for(i=0; i<2; i++) {
if (vp56_rac_get_prob(c, 205)) {
int delta, sign = vp56_rac_get(c);
delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,
vp56_mb_type_model_model);
if (!delta)
delta = 4 * vp56_rac_gets(c, 7);
model->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;
}
}
}
}
}
/* compute MB type probability tables based on previous MB type */
for (ctx=0; ctx<3; ctx++) {
int p[10];
for (type=0; type<10; type++)
p[type] = 100 * model->mb_types_stats[ctx][type][1];
for (type=0; type<10; type++) {
int p02, p34, p0234, p17, p56, p89, p5689, p156789;
/* conservative MB type probability */
model->mb_type[ctx][type][0] = 255 - (255 * model->mb_types_stats[ctx][type][0]) / (1 + model->mb_types_stats[ctx][type][0] + model->mb_types_stats[ctx][type][1]);
p[type] = 0; /* same MB type => weight is null */
/* binary tree parsing probabilities */
p02 = p[0] + p[2];
p34 = p[3] + p[4];
p0234 = p02 + p34;
p17 = p[1] + p[7];
p56 = p[5] + p[6];
p89 = p[8] + p[9];
p5689 = p56 + p89;
p156789 = p17 + p5689;
model->mb_type[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
model->mb_type[ctx][type][2] = 1 + 255 * p02 / (1+p0234);
model->mb_type[ctx][type][3] = 1 + 255 * p17 / (1+p156789);
model->mb_type[ctx][type][4] = 1 + 255 * p[0] / (1+p02);
model->mb_type[ctx][type][5] = 1 + 255 * p[3] / (1+p34);
model->mb_type[ctx][type][6] = 1 + 255 * p[1] / (1+p17);
model->mb_type[ctx][type][7] = 1 + 255 * p56 / (1+p5689);
model->mb_type[ctx][type][8] = 1 + 255 * p[5] / (1+p56);
model->mb_type[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
/* restore initial value */
p[type] = 100 * model->mb_types_stats[ctx][type][1];
}
}
}