194 lines
6.6 KiB
C
194 lines
6.6 KiB
C
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/*
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* FFV1 decoder template
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*
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* Copyright (c) 2003-2016 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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static av_always_inline int RENAME(decode_line)(FFV1Context *s, int w,
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TYPE *sample[2],
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int plane_index, int bits)
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{
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PlaneContext *const p = &s->plane[plane_index];
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RangeCoder *const c = &s->c;
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int x;
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int run_count = 0;
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int run_mode = 0;
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int run_index = s->run_index;
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if (is_input_end(s))
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return AVERROR_INVALIDDATA;
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if (s->slice_coding_mode == 1) {
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int i;
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for (x = 0; x < w; x++) {
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int v = 0;
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for (i=0; i<bits; i++) {
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uint8_t state = 128;
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v += v + get_rac(c, &state);
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}
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sample[1][x] = v;
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}
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return 0;
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}
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for (x = 0; x < w; x++) {
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int diff, context, sign;
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if (!(x & 1023)) {
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if (is_input_end(s))
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return AVERROR_INVALIDDATA;
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}
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context = RENAME(get_context)(p, sample[1] + x, sample[0] + x, sample[1] + x);
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if (context < 0) {
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context = -context;
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sign = 1;
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} else
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sign = 0;
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av_assert2(context < p->context_count);
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if (s->ac != AC_GOLOMB_RICE) {
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diff = get_symbol_inline(c, p->state[context], 1);
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} else {
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if (context == 0 && run_mode == 0)
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run_mode = 1;
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if (run_mode) {
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if (run_count == 0 && run_mode == 1) {
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if (get_bits1(&s->gb)) {
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run_count = 1 << ff_log2_run[run_index];
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if (x + run_count <= w)
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run_index++;
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} else {
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if (ff_log2_run[run_index])
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run_count = get_bits(&s->gb, ff_log2_run[run_index]);
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else
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run_count = 0;
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if (run_index)
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run_index--;
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run_mode = 2;
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}
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}
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if (sample[1][x - 1] == sample[0][x - 1]) {
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while (run_count > 1 && w-x > 1) {
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sample[1][x] = sample[0][x];
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x++;
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run_count--;
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}
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} else {
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while (run_count > 1 && w-x > 1) {
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sample[1][x] = RENAME(predict)(sample[1] + x, sample[0] + x);
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x++;
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run_count--;
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}
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}
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run_count--;
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if (run_count < 0) {
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run_mode = 0;
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run_count = 0;
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diff = get_vlc_symbol(&s->gb, &p->vlc_state[context],
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bits);
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if (diff >= 0)
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diff++;
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} else
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diff = 0;
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} else
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diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
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ff_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
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run_count, run_index, run_mode, x, get_bits_count(&s->gb));
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}
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if (sign)
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diff = -(unsigned)diff;
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sample[1][x] = av_mod_uintp2(RENAME(predict)(sample[1] + x, sample[0] + x) + (SUINT)diff, bits);
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}
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s->run_index = run_index;
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return 0;
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}
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static int RENAME(decode_rgb_frame)(FFV1Context *s, uint8_t *src[4], int w, int h, int stride[4])
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{
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int x, y, p;
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TYPE *sample[4][2];
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int lbd = s->avctx->bits_per_raw_sample <= 8;
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int bits = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 8;
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int offset = 1 << bits;
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int transparency = s->transparency;
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for (x = 0; x < 4; x++) {
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sample[x][0] = RENAME(s->sample_buffer) + x * 2 * (w + 6) + 3;
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sample[x][1] = RENAME(s->sample_buffer) + (x * 2 + 1) * (w + 6) + 3;
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}
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s->run_index = 0;
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memset(RENAME(s->sample_buffer), 0, 8 * (w + 6) * sizeof(*RENAME(s->sample_buffer)));
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for (y = 0; y < h; y++) {
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for (p = 0; p < 3 + transparency; p++) {
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int ret;
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TYPE *temp = sample[p][0]; // FIXME: try a normal buffer
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sample[p][0] = sample[p][1];
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sample[p][1] = temp;
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sample[p][1][-1]= sample[p][0][0 ];
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sample[p][0][ w]= sample[p][0][w-1];
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if (lbd && s->slice_coding_mode == 0)
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ret = RENAME(decode_line)(s, w, sample[p], (p + 1)/2, 9);
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else
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ret = RENAME(decode_line)(s, w, sample[p], (p + 1)/2, bits + (s->slice_coding_mode != 1));
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if (ret < 0)
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return ret;
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}
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for (x = 0; x < w; x++) {
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int g = sample[0][1][x];
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int b = sample[1][1][x];
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int r = sample[2][1][x];
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int a = sample[3][1][x];
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if (s->slice_coding_mode != 1) {
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b -= offset;
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r -= offset;
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g -= (b * s->slice_rct_by_coef + r * s->slice_rct_ry_coef) >> 2;
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b += g;
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r += g;
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}
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if (lbd)
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*((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + ((unsigned)g<<8) + ((unsigned)r<<16) + ((unsigned)a<<24);
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else if (sizeof(TYPE) == 4 || transparency) {
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*((uint16_t*)(src[0] + x*2 + stride[0]*y)) = g;
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*((uint16_t*)(src[1] + x*2 + stride[1]*y)) = b;
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*((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r;
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if (transparency)
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*((uint16_t*)(src[3] + x*2 + stride[3]*y)) = a;
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} else {
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*((uint16_t*)(src[0] + x*2 + stride[0]*y)) = b;
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*((uint16_t*)(src[1] + x*2 + stride[1]*y)) = g;
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*((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r;
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}
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}
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}
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return 0;
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}
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