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ffv1dec_template.c
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/*
* FFV1 decoder template
*
* Copyright (c) 2003-2016 Michael Niedermayer <michaelni@gmx.at>
*
* 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
*/
static av_always_inline int RENAME(decode_line)(FFV1Context *s, int w,
TYPE *sample[2],
int plane_index, int bits)
{
PlaneContext *const p = &s->plane[plane_index];
RangeCoder *const c = &s->c;
int x;
int run_count = 0;
int run_mode = 0;
int run_index = s->run_index;
if (is_input_end(s))
return AVERROR_INVALIDDATA;
if (s->slice_coding_mode == 1) {
int i;
for (x = 0; x < w; x++) {
int v = 0;
for (i=0; i<bits; i++) {
uint8_t state = 128;
v += v + get_rac(c, &state);
}
sample[1][x] = v;
}
return 0;
}
for (x = 0; x < w; x++) {
int diff, context, sign;
if (!(x & 1023)) {
if (is_input_end(s))
return AVERROR_INVALIDDATA;
}
context = RENAME(get_context)(p, sample[1] + x, sample[0] + x, sample[1] + x);
if (context < 0) {
context = -context;
sign = 1;
} else
sign = 0;
av_assert2(context < p->context_count);
if (s->ac != AC_GOLOMB_RICE) {
diff = get_symbol_inline(c, p->state[context], 1);
} else {
if (context == 0 && run_mode == 0)
run_mode = 1;
if (run_mode) {
if (run_count == 0 && run_mode == 1) {
if (get_bits1(&s->gb)) {
run_count = 1 << ff_log2_run[run_index];
if (x + run_count <= w)
run_index++;
} else {
if (ff_log2_run[run_index])
run_count = get_bits(&s->gb, ff_log2_run[run_index]);
else
run_count = 0;
if (run_index)
run_index--;
run_mode = 2;
}
}
if (sample[1][x - 1] == sample[0][x - 1]) {
while (run_count > 1 && w-x > 1) {
sample[1][x] = sample[0][x];
x++;
run_count--;
}
} else {
while (run_count > 1 && w-x > 1) {
sample[1][x] = RENAME(predict)(sample[1] + x, sample[0] + x);
x++;
run_count--;
}
}
run_count--;
if (run_count < 0) {
run_mode = 0;
run_count = 0;
diff = get_vlc_symbol(&s->gb, &p->vlc_state[context],
bits);
if (diff >= 0)
diff++;
} else
diff = 0;
} else
diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
ff_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
run_count, run_index, run_mode, x, get_bits_count(&s->gb));
}
if (sign)
diff = -(unsigned)diff;
sample[1][x] = av_mod_uintp2(RENAME(predict)(sample[1] + x, sample[0] + x) + (SUINT)diff, bits);
}
s->run_index = run_index;
return 0;
}
static int RENAME(decode_rgb_frame)(FFV1Context *s, uint8_t *src[4], int w, int h, int stride[4])
{
int x, y, p;
TYPE *sample[4][2];
int lbd = s->avctx->bits_per_raw_sample <= 8;
int bits = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 8;
int offset = 1 << bits;
int transparency = s->transparency;
for (x = 0; x < 4; x++) {
sample[x][0] = RENAME(s->sample_buffer) + x * 2 * (w + 6) + 3;
sample[x][1] = RENAME(s->sample_buffer) + (x * 2 + 1) * (w + 6) + 3;
}
s->run_index = 0;
memset(RENAME(s->sample_buffer), 0, 8 * (w + 6) * sizeof(*RENAME(s->sample_buffer)));
for (y = 0; y < h; y++) {
for (p = 0; p < 3 + transparency; p++) {
int ret;
TYPE *temp = sample[p][0]; // FIXME: try a normal buffer
sample[p][0] = sample[p][1];
sample[p][1] = temp;
sample[p][1][-1]= sample[p][0][0 ];
sample[p][0][ w]= sample[p][0][w-1];
if (lbd && s->slice_coding_mode == 0)
ret = RENAME(decode_line)(s, w, sample[p], (p + 1)/2, 9);
else
ret = RENAME(decode_line)(s, w, sample[p], (p + 1)/2, bits + (s->slice_coding_mode != 1));
if (ret < 0)
return ret;
}
for (x = 0; x < w; x++) {
int g = sample[0][1][x];
int b = sample[1][1][x];
int r = sample[2][1][x];
int a = sample[3][1][x];
if (s->slice_coding_mode != 1) {
b -= offset;
r -= offset;
g -= (b * s->slice_rct_by_coef + r * s->slice_rct_ry_coef) >> 2;
b += g;
r += g;
}
if (lbd)
*((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + ((unsigned)g<<8) + ((unsigned)r<<16) + ((unsigned)a<<24);
else if (sizeof(TYPE) == 4 || transparency) {
*((uint16_t*)(src[0] + x*2 + stride[0]*y)) = g;
*((uint16_t*)(src[1] + x*2 + stride[1]*y)) = b;
*((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r;
if (transparency)
*((uint16_t*)(src[3] + x*2 + stride[3]*y)) = a;
} else {
*((uint16_t*)(src[0] + x*2 + stride[0]*y)) = b;
*((uint16_t*)(src[1] + x*2 + stride[1]*y)) = g;
*((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r;
}
}
}
return 0;
}