| /* |
| * 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; |
| } |