438 lines
15 KiB
C
438 lines
15 KiB
C
/*
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2013 Clément Bœsch <u pkh me>
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* Simple post processing filter
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*
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* This implementation is based on an algorithm described in
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* "Aria Nosratinia Embedded Post-Processing for
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* Enhancement of Compressed Images (1999)"
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*
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* Originally written by Michael Niedermayer for the MPlayer project, and
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* ported by Clément Bœsch for FFmpeg.
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*/
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#include "libavcodec/dsputil.h"
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#include "libavutil/avassert.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "internal.h"
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#include "vf_spp.h"
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enum mode {
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MODE_HARD,
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MODE_SOFT,
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NB_MODES
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};
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#define OFFSET(x) offsetof(SPPContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption spp_options[] = {
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{ "quality", "set quality", OFFSET(log2_count), AV_OPT_TYPE_INT, {.i64 = 3}, 0, MAX_LEVEL, FLAGS },
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{ "qp", "force a constant quantizer parameter", OFFSET(qp), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 63, FLAGS },
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{ "mode", "set thresholding mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_HARD}, 0, NB_MODES - 1, FLAGS, "mode" },
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{ "hard", "hard thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_HARD}, INT_MIN, INT_MAX, FLAGS, "mode" },
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{ "soft", "soft thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_SOFT}, INT_MIN, INT_MAX, FLAGS, "mode" },
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{ "use_bframe_qp", "use B-frames' QP", OFFSET(use_bframe_qp), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(spp);
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// XXX: share between filters?
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DECLARE_ALIGNED(8, static const uint8_t, ldither)[8][8] = {
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{ 0, 48, 12, 60, 3, 51, 15, 63 },
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{ 32, 16, 44, 28, 35, 19, 47, 31 },
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{ 8, 56, 4, 52, 11, 59, 7, 55 },
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{ 40, 24, 36, 20, 43, 27, 39, 23 },
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{ 2, 50, 14, 62, 1, 49, 13, 61 },
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{ 34, 18, 46, 30, 33, 17, 45, 29 },
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{ 10, 58, 6, 54, 9, 57, 5, 53 },
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{ 42, 26, 38, 22, 41, 25, 37, 21 },
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};
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static const uint8_t offset[127][2] = {
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{0,0},
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{0,0}, {4,4}, // quality = 1
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{0,0}, {2,2}, {6,4}, {4,6}, // quality = 2
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{0,0}, {5,1}, {2,2}, {7,3}, {4,4}, {1,5}, {6,6}, {3,7}, // quality = 3
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{0,0}, {4,0}, {1,1}, {5,1}, {3,2}, {7,2}, {2,3}, {6,3}, // quality = 4
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{0,4}, {4,4}, {1,5}, {5,5}, {3,6}, {7,6}, {2,7}, {6,7},
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{0,0}, {0,2}, {0,4}, {0,6}, {1,1}, {1,3}, {1,5}, {1,7}, // quality = 5
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{2,0}, {2,2}, {2,4}, {2,6}, {3,1}, {3,3}, {3,5}, {3,7},
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{4,0}, {4,2}, {4,4}, {4,6}, {5,1}, {5,3}, {5,5}, {5,7},
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{6,0}, {6,2}, {6,4}, {6,6}, {7,1}, {7,3}, {7,5}, {7,7},
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{0,0}, {4,4}, {0,4}, {4,0}, {2,2}, {6,6}, {2,6}, {6,2}, // quality = 6
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{0,2}, {4,6}, {0,6}, {4,2}, {2,0}, {6,4}, {2,4}, {6,0},
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{1,1}, {5,5}, {1,5}, {5,1}, {3,3}, {7,7}, {3,7}, {7,3},
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{1,3}, {5,7}, {1,7}, {5,3}, {3,1}, {7,5}, {3,5}, {7,1},
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{0,1}, {4,5}, {0,5}, {4,1}, {2,3}, {6,7}, {2,7}, {6,3},
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{0,3}, {4,7}, {0,7}, {4,3}, {2,1}, {6,5}, {2,5}, {6,1},
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{1,0}, {5,4}, {1,4}, {5,0}, {3,2}, {7,6}, {3,6}, {7,2},
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{1,2}, {5,6}, {1,6}, {5,2}, {3,0}, {7,4}, {3,4}, {7,0},
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};
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static void hardthresh_c(int16_t dst[64], const int16_t src[64],
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int qp, const uint8_t *permutation)
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{
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int i;
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int bias = 0; // FIXME
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unsigned threshold1 = qp * ((1<<4) - bias) - 1;
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unsigned threshold2 = threshold1 << 1;
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memset(dst, 0, 64 * sizeof(dst[0]));
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dst[0] = (src[0] + 4) >> 3;
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for (i = 1; i < 64; i++) {
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int level = src[i];
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if (((unsigned)(level + threshold1)) > threshold2) {
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const int j = permutation[i];
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dst[j] = (level + 4) >> 3;
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}
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}
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}
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static void softthresh_c(int16_t dst[64], const int16_t src[64],
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int qp, const uint8_t *permutation)
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{
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int i;
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int bias = 0; //FIXME
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unsigned threshold1 = qp * ((1<<4) - bias) - 1;
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unsigned threshold2 = threshold1 << 1;
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memset(dst, 0, 64 * sizeof(dst[0]));
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dst[0] = (src[0] + 4) >> 3;
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for (i = 1; i < 64; i++) {
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int level = src[i];
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if (((unsigned)(level + threshold1)) > threshold2) {
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const int j = permutation[i];
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if (level > 0) dst[j] = (level - threshold1 + 4) >> 3;
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else dst[j] = (level + threshold1 + 4) >> 3;
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}
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}
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}
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static void store_slice_c(uint8_t *dst, const int16_t *src,
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int dst_linesize, int src_linesize,
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int width, int height, int log2_scale,
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const uint8_t dither[8][8])
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{
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int y, x;
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#define STORE(pos) do { \
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temp = ((src[x + y*src_linesize + pos] << log2_scale) + d[pos]) >> 6; \
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if (temp & 0x100) \
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temp = ~(temp >> 31); \
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dst[x + y*dst_linesize + pos] = temp; \
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} while (0)
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for (y = 0; y < height; y++) {
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const uint8_t *d = dither[y];
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for (x = 0; x < width; x += 8) {
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int temp;
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STORE(0);
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STORE(1);
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STORE(2);
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STORE(3);
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STORE(4);
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STORE(5);
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STORE(6);
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STORE(7);
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}
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}
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}
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static inline void add_block(int16_t *dst, int linesize, const int16_t block[64])
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{
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int y;
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for (y = 0; y < 8; y++) {
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*(uint32_t *)&dst[0 + y*linesize] += *(uint32_t *)&block[0 + y*8];
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*(uint32_t *)&dst[2 + y*linesize] += *(uint32_t *)&block[2 + y*8];
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*(uint32_t *)&dst[4 + y*linesize] += *(uint32_t *)&block[4 + y*8];
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*(uint32_t *)&dst[6 + y*linesize] += *(uint32_t *)&block[6 + y*8];
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}
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}
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// XXX: export the function?
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static inline int norm_qscale(int qscale, int type)
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{
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switch (type) {
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case FF_QSCALE_TYPE_MPEG1: return qscale;
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case FF_QSCALE_TYPE_MPEG2: return qscale >> 1;
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case FF_QSCALE_TYPE_H264: return qscale >> 2;
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case FF_QSCALE_TYPE_VP56: return (63 - qscale + 2) >> 2;
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}
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return qscale;
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}
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static void filter(SPPContext *p, uint8_t *dst, uint8_t *src,
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int dst_linesize, int src_linesize, int width, int height,
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const uint8_t *qp_table, int qp_stride, int is_luma)
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{
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int x, y, i;
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const int count = 1 << p->log2_count;
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const int linesize = is_luma ? p->temp_linesize : FFALIGN(width+16, 16);
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DECLARE_ALIGNED(16, uint64_t, block_align)[32];
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int16_t *block = (int16_t *)block_align;
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int16_t *block2 = (int16_t *)(block_align + 16);
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for (y = 0; y < height; y++) {
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int index = 8 + 8*linesize + y*linesize;
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memcpy(p->src + index, src + y*src_linesize, width);
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for (x = 0; x < 8; x++) {
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p->src[index - x - 1] = p->src[index + x ];
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p->src[index + width + x ] = p->src[index + width - x - 1];
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}
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}
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for (y = 0; y < 8; y++) {
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memcpy(p->src + ( 7-y)*linesize, p->src + ( y+8)*linesize, linesize);
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memcpy(p->src + (height+8+y)*linesize, p->src + (height-y+7)*linesize, linesize);
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}
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for (y = 0; y < height + 8; y += 8) {
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memset(p->temp + (8 + y) * linesize, 0, 8 * linesize * sizeof(*p->temp));
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for (x = 0; x < width + 8; x += 8) {
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int qp;
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if (p->qp) {
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qp = p->qp;
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} else{
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const int qps = 3 + is_luma;
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qp = qp_table[(FFMIN(x, width - 1) >> qps) + (FFMIN(y, height - 1) >> qps) * qp_stride];
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qp = FFMAX(1, norm_qscale(qp, p->qscale_type));
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}
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for (i = 0; i < count; i++) {
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const int x1 = x + offset[i + count - 1][0];
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const int y1 = y + offset[i + count - 1][1];
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const int index = x1 + y1*linesize;
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p->dsp.get_pixels(block, p->src + index, linesize);
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p->dsp.fdct(block);
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p->requantize(block2, block, qp, p->dsp.idct_permutation);
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p->dsp.idct(block2);
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add_block(p->temp + index, linesize, block2);
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}
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}
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if (y)
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p->store_slice(dst + (y - 8) * dst_linesize, p->temp + 8 + y*linesize,
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dst_linesize, linesize, width,
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FFMIN(8, height + 8 - y), MAX_LEVEL - p->log2_count,
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ldither);
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}
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum PixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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SPPContext *spp = inlink->dst->priv;
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const int h = FFALIGN(inlink->h + 16, 16);
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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spp->hsub = desc->log2_chroma_w;
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spp->vsub = desc->log2_chroma_h;
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spp->temp_linesize = FFALIGN(inlink->w + 16, 16);
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spp->temp = av_malloc_array(spp->temp_linesize, h * sizeof(*spp->temp));
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spp->src = av_malloc_array(spp->temp_linesize, h * sizeof(*spp->src));
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if (!spp->use_bframe_qp) {
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/* we are assuming here the qp blocks will not be smaller that 16x16 */
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spp->non_b_qp_alloc_size = FF_CEIL_RSHIFT(inlink->w, 4) * FF_CEIL_RSHIFT(inlink->h, 4);
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spp->non_b_qp_table = av_calloc(spp->non_b_qp_alloc_size, sizeof(*spp->non_b_qp_table));
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if (!spp->non_b_qp_table)
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return AVERROR(ENOMEM);
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}
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if (!spp->temp || !spp->src)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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SPPContext *spp = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFrame *out = in;
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int qp_stride = 0;
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const int8_t *qp_table = NULL;
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/* if we are not in a constant user quantizer mode and we don't want to use
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* the quantizers from the B-frames (B-frames often have a higher QP), we
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* need to save the qp table from the last non B-frame; this is what the
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* following code block does */
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if (!spp->qp) {
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qp_table = av_frame_get_qp_table(in, &qp_stride, &spp->qscale_type);
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if (qp_table && !spp->use_bframe_qp && in->pict_type != AV_PICTURE_TYPE_B) {
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int w, h;
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/* if the qp stride is not set, it means the QP are only defined on
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* a line basis */
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if (!qp_stride) {
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w = FF_CEIL_RSHIFT(inlink->w, 4);
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h = 1;
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} else {
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w = FF_CEIL_RSHIFT(qp_stride, 4);
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h = FF_CEIL_RSHIFT(inlink->h, 4);
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}
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av_assert0(w * h <= spp->non_b_qp_alloc_size);
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memcpy(spp->non_b_qp_table, qp_table, w * h);
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}
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}
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if (spp->log2_count && !ctx->is_disabled) {
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if (!spp->use_bframe_qp && spp->non_b_qp_table)
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qp_table = spp->non_b_qp_table;
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if (qp_table || spp->qp) {
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const int cw = FF_CEIL_RSHIFT(inlink->w, spp->hsub);
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const int ch = FF_CEIL_RSHIFT(inlink->h, spp->vsub);
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/* get a new frame if in-place is not possible or if the dimensions
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* are not multiple of 8 */
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if (!av_frame_is_writable(in) || (inlink->w & 7) || (inlink->h & 7)) {
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const int aligned_w = FFALIGN(inlink->w, 8);
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const int aligned_h = FFALIGN(inlink->h, 8);
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out = ff_get_video_buffer(outlink, aligned_w, aligned_h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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out->width = in->width;
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out->height = in->height;
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}
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filter(spp, out->data[0], in->data[0], out->linesize[0], in->linesize[0], inlink->w, inlink->h, qp_table, qp_stride, 1);
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filter(spp, out->data[1], in->data[1], out->linesize[1], in->linesize[1], cw, ch, qp_table, qp_stride, 0);
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filter(spp, out->data[2], in->data[2], out->linesize[2], in->linesize[2], cw, ch, qp_table, qp_stride, 0);
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emms_c();
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}
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}
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if (in != out) {
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if (in->data[3])
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av_image_copy_plane(out->data[3], out->linesize[3],
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in ->data[3], in ->linesize[3],
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inlink->w, inlink->h);
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av_frame_free(&in);
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}
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return ff_filter_frame(outlink, out);
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}
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
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char *res, int res_len, int flags)
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{
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SPPContext *spp = ctx->priv;
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if (!strcmp(cmd, "level")) {
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if (!strcmp(args, "max"))
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spp->log2_count = MAX_LEVEL;
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else
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spp->log2_count = av_clip(strtol(args, NULL, 10), 0, MAX_LEVEL);
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return 0;
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}
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return AVERROR(ENOSYS);
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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SPPContext *spp = ctx->priv;
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spp->avctx = avcodec_alloc_context3(NULL);
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if (!spp->avctx)
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return AVERROR(ENOMEM);
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avpriv_dsputil_init(&spp->dsp, spp->avctx);
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spp->store_slice = store_slice_c;
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switch (spp->mode) {
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case MODE_HARD: spp->requantize = hardthresh_c; break;
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case MODE_SOFT: spp->requantize = softthresh_c; break;
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}
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if (ARCH_X86)
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ff_spp_init_x86(spp);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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SPPContext *spp = ctx->priv;
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av_freep(&spp->temp);
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av_freep(&spp->src);
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if (spp->avctx) {
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avcodec_close(spp->avctx);
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av_freep(&spp->avctx);
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}
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av_freep(&spp->non_b_qp_table);
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}
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static const AVFilterPad spp_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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|
.filter_frame = filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad spp_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_vf_spp = {
|
|
.name = "spp",
|
|
.description = NULL_IF_CONFIG_SMALL("Apply a simple post processing filter."),
|
|
.priv_size = sizeof(SPPContext),
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
.inputs = spp_inputs,
|
|
.outputs = spp_outputs,
|
|
.process_command = process_command,
|
|
.priv_class = &spp_class,
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
|
|
};
|