libavfilter/vf_uspp.c
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 /*
  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  * Copyright (c) 2014 Arwa Arif <arwaarif1994@gmail.com>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 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 General Public License for more details.
  *
  * You should have received a copy of the GNU 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.
  */
 
 /**
  * @file
  * Ultra Slow/Simple Post-processing filter.
  *
  * Originally written by Michael Niedermayer for the MPlayer project, and
  * ported by Arwa Arif for FFmpeg.
  */
 
 #include "libavutil/avassert.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
 #include "internal.h"
 #include "avfilter.h"
 
 #define MAX_LEVEL 8 /* quality levels */
 #define BLOCK 16
 
 typedef struct {
     const AVClass *av_class;
     int log2_count;
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     int hsub, vsub;
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     int qp;
     int qscale_type;
     int temp_stride[3];
     uint8_t *src[3];
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     uint16_t *temp[3];
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     int outbuf_size;
     uint8_t *outbuf;
     AVCodecContext *avctx_enc[BLOCK*BLOCK];
     AVFrame *frame;
     AVFrame *frame_dec;
     uint8_t *non_b_qp_table;
     int non_b_qp_alloc_size;
     int use_bframe_qp;
 } USPPContext;
 
 #define OFFSET(x) offsetof(USPPContext, x)
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
 static const AVOption uspp_options[] = {
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     { "quality",       "set quality",                          OFFSET(log2_count),    AV_OPT_TYPE_INT, {.i64 = 3}, 0, MAX_LEVEL, FLAGS },
     { "qp",            "force a constant quantizer parameter", OFFSET(qp),            AV_OPT_TYPE_INT, {.i64 = 0}, 0, 63,        FLAGS },
     { "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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 AVFILTER_DEFINE_CLASS(uspp);
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 DECLARE_ALIGNED(8, static const uint8_t, dither)[8][8] = {
     {  0*4,  48*4,  12*4,  60*4,   3*4,  51*4,  15*4,  63*4, },
     { 32*4,  16*4,  44*4,  28*4,  35*4,  19*4,  47*4,  31*4, },
     {  8*4,  56*4,   4*4,  52*4,  11*4,  59*4,   7*4,  55*4, },
     { 40*4,  24*4,  36*4,  20*4,  43*4,  27*4,  39*4,  23*4, },
     {  2*4,  50*4,  14*4,  62*4,   1*4,  49*4,  13*4,  61*4, },
     { 34*4,  18*4,  46*4,  30*4,  33*4,  17*4,  45*4,  29*4, },
     { 10*4,  58*4,   6*4,  54*4,   9*4,  57*4,   5*4,  53*4, },
     { 42*4,  26*4,  38*4,  22*4,  41*4,  25*4,  37*4,  21*4, },
 };
 
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 static const uint8_t offset[511][2] = {
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     { 0, 0},
     { 0, 0}, { 8, 8},                                                              // quality 1
     { 0, 0}, { 4, 4}, {12, 8}, { 8,12},                                            // quality 2
     { 0, 0}, {10, 2}, { 4, 4}, {14, 6}, { 8, 8}, { 2,10}, {12,12}, { 6,14},        // quality 3
 
     { 0, 0}, {10, 2}, { 4, 4}, {14, 6}, { 8, 8}, { 2,10}, {12,12}, { 6,14},
     { 5, 1}, {15, 3}, { 9, 5}, { 3, 7}, {13, 9}, { 7,11}, { 1,13}, {11,15},        // quality 4
 
     { 0, 0}, { 8, 0}, { 0, 8}, { 8, 8}, { 5, 1}, {13, 1}, { 5, 9}, {13, 9},
     { 2, 2}, {10, 2}, { 2,10}, {10,10}, { 7, 3}, {15, 3}, { 7,11}, {15,11},
     { 4, 4}, {12, 4}, { 4,12}, {12,12}, { 1, 5}, { 9, 5}, { 1,13}, { 9,13},
     { 6, 6}, {14, 6}, { 6,14}, {14,14}, { 3, 7}, {11, 7}, { 3,15}, {11,15},        // quality 5
 
     { 0, 0}, { 8, 0}, { 0, 8}, { 8, 8}, { 4, 0}, {12, 0}, { 4, 8}, {12, 8},
     { 1, 1}, { 9, 1}, { 1, 9}, { 9, 9}, { 5, 1}, {13, 1}, { 5, 9}, {13, 9},
     { 3, 2}, {11, 2}, { 3,10}, {11,10}, { 7, 2}, {15, 2}, { 7,10}, {15,10},
     { 2, 3}, {10, 3}, { 2,11}, {10,11}, { 6, 3}, {14, 3}, { 6,11}, {14,11},
     { 0, 4}, { 8, 4}, { 0,12}, { 8,12}, { 4, 4}, {12, 4}, { 4,12}, {12,12},
     { 1, 5}, { 9, 5}, { 1,13}, { 9,13}, { 5, 5}, {13, 5}, { 5,13}, {13,13},
     { 3, 6}, {11, 6}, { 3,14}, {11,14}, { 7, 6}, {15, 6}, { 7,14}, {15,14},
     { 2, 7}, {10, 7}, { 2,15}, {10,15}, { 6, 7}, {14, 7}, { 6,15}, {14,15},        // quality 6
 
     { 0, 0}, { 8, 0}, { 0, 8}, { 8, 8}, { 0, 2}, { 8, 2}, { 0,10}, { 8,10},
     { 0, 4}, { 8, 4}, { 0,12}, { 8,12}, { 0, 6}, { 8, 6}, { 0,14}, { 8,14},
     { 1, 1}, { 9, 1}, { 1, 9}, { 9, 9}, { 1, 3}, { 9, 3}, { 1,11}, { 9,11},
     { 1, 5}, { 9, 5}, { 1,13}, { 9,13}, { 1, 7}, { 9, 7}, { 1,15}, { 9,15},
     { 2, 0}, {10, 0}, { 2, 8}, {10, 8}, { 2, 2}, {10, 2}, { 2,10}, {10,10},
     { 2, 4}, {10, 4}, { 2,12}, {10,12}, { 2, 6}, {10, 6}, { 2,14}, {10,14},
     { 3, 1}, {11, 1}, { 3, 9}, {11, 9}, { 3, 3}, {11, 3}, { 3,11}, {11,11},
     { 3, 5}, {11, 5}, { 3,13}, {11,13}, { 3, 7}, {11, 7}, { 3,15}, {11,15},
     { 4, 0}, {12, 0}, { 4, 8}, {12, 8}, { 4, 2}, {12, 2}, { 4,10}, {12,10},
     { 4, 4}, {12, 4}, { 4,12}, {12,12}, { 4, 6}, {12, 6}, { 4,14}, {12,14},
     { 5, 1}, {13, 1}, { 5, 9}, {13, 9}, { 5, 3}, {13, 3}, { 5,11}, {13,11},
     { 5, 5}, {13, 5}, { 5,13}, {13,13}, { 5, 7}, {13, 7}, { 5,15}, {13,15},
     { 6, 0}, {14, 0}, { 6, 8}, {14, 8}, { 6, 2}, {14, 2}, { 6,10}, {14,10},
     { 6, 4}, {14, 4}, { 6,12}, {14,12}, { 6, 6}, {14, 6}, { 6,14}, {14,14},
     { 7, 1}, {15, 1}, { 7, 9}, {15, 9}, { 7, 3}, {15, 3}, { 7,11}, {15,11},
     { 7, 5}, {15, 5}, { 7,13}, {15,13}, { 7, 7}, {15, 7}, { 7,15}, {15,15},        // quality 7
 
     { 0, 0}, { 8, 0}, { 0, 8}, { 8, 8}, { 4, 4}, {12, 4}, { 4,12}, {12,12},
     { 0, 4}, { 8, 4}, { 0,12}, { 8,12}, { 4, 0}, {12, 0}, { 4, 8}, {12, 8},
     { 2, 2}, {10, 2}, { 2,10}, {10,10}, { 6, 6}, {14, 6}, { 6,14}, {14,14},
     { 2, 6}, {10, 6}, { 2,14}, {10,14}, { 6, 2}, {14, 2}, { 6,10}, {14,10},
     { 0, 2}, { 8, 2}, { 0,10}, { 8,10}, { 4, 6}, {12, 6}, { 4,14}, {12,14},
     { 0, 6}, { 8, 6}, { 0,14}, { 8,14}, { 4, 2}, {12, 2}, { 4,10}, {12,10},
     { 2, 0}, {10, 0}, { 2, 8}, {10, 8}, { 6, 4}, {14, 4}, { 6,12}, {14,12},
     { 2, 4}, {10, 4}, { 2,12}, {10,12}, { 6, 0}, {14, 0}, { 6, 8}, {14, 8},
     { 1, 1}, { 9, 1}, { 1, 9}, { 9, 9}, { 5, 5}, {13, 5}, { 5,13}, {13,13},
     { 1, 5}, { 9, 5}, { 1,13}, { 9,13}, { 5, 1}, {13, 1}, { 5, 9}, {13, 9},
     { 3, 3}, {11, 3}, { 3,11}, {11,11}, { 7, 7}, {15, 7}, { 7,15}, {15,15},
     { 3, 7}, {11, 7}, { 3,15}, {11,15}, { 7, 3}, {15, 3}, { 7,11}, {15,11},
     { 1, 3}, { 9, 3}, { 1,11}, { 9,11}, { 5, 7}, {13, 7}, { 5,15}, {13,15},
     { 1, 7}, { 9, 7}, { 1,15}, { 9,15}, { 5, 3}, {13, 3}, { 5,11}, {13,11},        // quality 8
     { 3, 1}, {11, 1}, { 3, 9}, {11, 9}, { 7, 5}, {15, 5}, { 7,13}, {15,13},
     { 3, 5}, {11, 5}, { 3,13}, {11,13}, { 7, 1}, {15, 1}, { 7, 9}, {15, 9},
     { 0, 1}, { 8, 1}, { 0, 9}, { 8, 9}, { 4, 5}, {12, 5}, { 4,13}, {12,13},
     { 0, 5}, { 8, 5}, { 0,13}, { 8,13}, { 4, 1}, {12, 1}, { 4, 9}, {12, 9},
     { 2, 3}, {10, 3}, { 2,11}, {10,11}, { 6, 7}, {14, 7}, { 6,15}, {14,15},
     { 2, 7}, {10, 7}, { 2,15}, {10,15}, { 6, 3}, {14, 3}, { 6,11}, {14,11},
     { 0, 3}, { 8, 3}, { 0,11}, { 8,11}, { 4, 7}, {12, 7}, { 4,15}, {12,15},
     { 0, 7}, { 8, 7}, { 0,15}, { 8,15}, { 4, 3}, {12, 3}, { 4,11}, {12,11},
     { 2, 1}, {10, 1}, { 2, 9}, {10, 9}, { 6, 5}, {14, 5}, { 6,13}, {14,13},
     { 2, 5}, {10, 5}, { 2,13}, {10,13}, { 6, 1}, {14, 1}, { 6, 9}, {14, 9},
     { 1, 0}, { 9, 0}, { 1, 8}, { 9, 8}, { 5, 4}, {13, 4}, { 5,12}, {13,12},
     { 1, 4}, { 9, 4}, { 1,12}, { 9,12}, { 5, 0}, {13, 0}, { 5, 8}, {13, 8},
     { 3, 2}, {11, 2}, { 3,10}, {11,10}, { 7, 6}, {15, 6}, { 7,14}, {15,14},
     { 3, 6}, {11, 6}, { 3,14}, {11,14}, { 7, 2}, {15, 2}, { 7,10}, {15,10},
     { 1, 2}, { 9, 2}, { 1,10}, { 9,10}, { 5, 6}, {13, 6}, { 5,14}, {13,14},
     { 1, 6}, { 9, 6}, { 1,14}, { 9,14}, { 5, 2}, {13, 2}, { 5,10}, {13,10},
     { 3, 0}, {11, 0}, { 3, 8}, {11, 8}, { 7, 4}, {15, 4}, { 7,12}, {15,12},
     { 3, 4}, {11, 4}, { 3,12}, {11,12}, { 7, 0}, {15, 0}, { 7, 8}, {15, 8},
 };
 
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 static void store_slice_c(uint8_t *dst, const uint16_t *src,
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                           int dst_stride, int src_stride,
                           int width, int height, int log2_scale)
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 {
     int y, x;
 
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 #define STORE(pos) do {                                                     \
     temp = ((src[x + y * src_stride + pos] << log2_scale) + d[pos]) >> 8;   \
     if (temp & 0x100) temp = ~(temp >> 31);                                 \
     dst[x + y * dst_stride + pos] = temp;                                   \
 } while (0)
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     for (y = 0; y < height; y++) {
         const uint8_t *d = dither[y&7];
         for (x = 0; x < width; x += 8) {
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             int temp;
             STORE(0);
             STORE(1);
             STORE(2);
             STORE(3);
             STORE(4);
             STORE(5);
             STORE(6);
             STORE(7);
         }
     }
 }
 
 static void filter(USPPContext *p, uint8_t *dst[3], uint8_t *src[3],
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                    int dst_stride[3], int src_stride[3], int width,
                    int height, uint8_t *qp_store, int qp_stride)
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 {
     int x, y, i, j;
     const int count = 1<<p->log2_count;
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     for (i = 0; i < 3; i++) {
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         int is_chroma = !!i;
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         int w = FF_CEIL_RSHIFT(width,  is_chroma ? p->hsub : 0);
         int h = FF_CEIL_RSHIFT(height, is_chroma ? p->vsub : 0);
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         int stride = p->temp_stride[i];
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         int block = BLOCK >> (is_chroma ? p->hsub : 0);
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         if (!src[i] || !dst[i])
             continue;
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         for (y = 0; y < h; y++) {
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             int index = block + block * stride + y * stride;
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             memcpy(p->src[i] + index, src[i] + y * src_stride[i], w );
             for (x = 0; x < block; x++) {
                 p->src[i][index     - x - 1] = p->src[i][index +     x    ];
                 p->src[i][index + w + x    ] = p->src[i][index + w - x - 1];
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             }
         }
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         for (y = 0; y < block; y++) {
             memcpy(p->src[i] + (  block-1-y) * stride, p->src[i] + (  y+block  ) * stride, stride);
             memcpy(p->src[i] + (h+block  +y) * stride, p->src[i] + (h-y+block-1) * stride, stride);
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         }
 
         p->frame->linesize[i] = stride;
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         memset(p->temp[i], 0, (h + 2 * block) * stride * sizeof(int16_t));
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     }
 
     if (p->qp)
         p->frame->quality = p->qp * FF_QP2LAMBDA;
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     else {
         int qpsum=0;
         int qpcount = (height>>4) * (height>>4);
 
         for (y = 0; y < (height>>4); y++) {
             for (x = 0; x < (width>>4); x++)
                 qpsum += qp_store[x + y * qp_stride];
         }
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         p->frame->quality = ff_norm_qscale((qpsum + qpcount/2) / qpcount, p->qscale_type) * FF_QP2LAMBDA;
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     }
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 //    init per MB qscale stuff FIXME
     p->frame->height = height;
     p->frame->width  = width;
 
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     for (i = 0; i < count; i++) {
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         const int x1 = offset[i+count-1][0];
         const int y1 = offset[i+count-1][1];
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         const int x1c = x1 >> p->hsub;
         const int y1c = y1 >> p->vsub;
         const int BLOCKc = BLOCK >> p->hsub;
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         int offset;
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         AVPacket pkt = {0};
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         int got_pkt_ptr;
 
         av_init_packet(&pkt);
         pkt.data = p->outbuf;
         pkt.size = p->outbuf_size;
 
         p->frame->data[0] = p->src[0] + x1   + y1   * p->frame->linesize[0];
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         p->frame->data[1] = p->src[1] + x1c  + y1c  * p->frame->linesize[1];
         p->frame->data[2] = p->src[2] + x1c  + y1c  * p->frame->linesize[2];
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         p->frame->format  = p->avctx_enc[i]->pix_fmt;
 
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         avcodec_encode_video2(p->avctx_enc[i], &pkt, p->frame, &got_pkt_ptr);
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         p->frame_dec = p->avctx_enc[i]->coded_frame;
 
         offset = (BLOCK-x1) + (BLOCK-y1) * p->frame_dec->linesize[0];
 
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         for (y = 0; y < height; y++)
             for (x = 0; x < width; x++)
                 p->temp[0][x + y * p->temp_stride[0]] += p->frame_dec->data[0][x + y * p->frame_dec->linesize[0] + offset];
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         if (!src[2] || !dst[2])
             continue;
 
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         offset = (BLOCKc-x1c) + (BLOCKc-y1c) * p->frame_dec->linesize[1];
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         for (y = 0; y < FF_CEIL_RSHIFT(height, p->vsub); y++) {
             for (x = 0; x < FF_CEIL_RSHIFT(width, p->hsub); x++) {
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                 p->temp[1][x + y * p->temp_stride[1]] += p->frame_dec->data[1][x + y * p->frame_dec->linesize[1] + offset];
                 p->temp[2][x + y * p->temp_stride[2]] += p->frame_dec->data[2][x + y * p->frame_dec->linesize[2] + offset];
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             }
         }
     }
 
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     for (j = 0; j < 3; j++) {
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         int is_chroma = !!j;
         if (!dst[j])
             continue;
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         store_slice_c(dst[j], p->temp[j], dst_stride[j], p->temp_stride[j],
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                       FF_CEIL_RSHIFT(width,  is_chroma ? p->hsub : 0),
                       FF_CEIL_RSHIFT(height, is_chroma ? p->vsub : 0),
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                       8-p->log2_count);
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     }
 }
 
 static int query_formats(AVFilterContext *ctx)
 {
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     static const enum AVPixelFormat pix_fmts[] = {
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         AV_PIX_FMT_YUV444P,
         AV_PIX_FMT_YUV420P,
         AV_PIX_FMT_YUV410P,
         AV_PIX_FMT_YUVJ444P,
         AV_PIX_FMT_YUVJ420P,
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         AV_PIX_FMT_GRAY8,
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         AV_PIX_FMT_NONE
     };
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     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
     if (!fmts_list)
         return AVERROR(ENOMEM);
     return ff_set_common_formats(ctx, fmts_list);
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 }
 
 static int config_input(AVFilterLink *inlink)
 {
 
     AVFilterContext *ctx = inlink->dst;
     USPPContext *uspp = ctx->priv;
     const int height = inlink->h;
     const int width  = inlink->w;
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     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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     int i;
 
     AVCodec *enc = avcodec_find_encoder(AV_CODEC_ID_SNOW);
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     if (!enc) {
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         av_log(ctx, AV_LOG_ERROR, "SNOW encoder not found.\n");
         return AVERROR(EINVAL);
     }
 
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     uspp->hsub = desc->log2_chroma_w;
     uspp->vsub = desc->log2_chroma_h;
 
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     for (i = 0; i < 3; i++) {
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         int is_chroma = !!i;
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         int w = (width  + 4 * BLOCK-1) & (~(2 * BLOCK-1));
         int h = (height + 4 * BLOCK-1) & (~(2 * BLOCK-1));
 
         if (is_chroma) {
             w = FF_CEIL_RSHIFT(w, uspp->hsub);
             h = FF_CEIL_RSHIFT(h, uspp->vsub);
         }
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         uspp->temp_stride[i] = w;
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         if (!(uspp->temp[i] = av_malloc_array(uspp->temp_stride[i], h * sizeof(int16_t))))
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             return AVERROR(ENOMEM);
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         if (!(uspp->src [i] = av_malloc_array(uspp->temp_stride[i], h * sizeof(uint8_t))))
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             return AVERROR(ENOMEM);
     }
 
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     for (i = 0; i < (1<<uspp->log2_count); i++) {
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         AVCodecContext *avctx_enc;
         AVDictionary *opts = NULL;
         int ret;
 
         if (!(uspp->avctx_enc[i] = avcodec_alloc_context3(NULL)))
             return AVERROR(ENOMEM);
 
         avctx_enc = uspp->avctx_enc[i];
         avctx_enc->width = width + BLOCK;
         avctx_enc->height = height + BLOCK;
         avctx_enc->time_base = (AVRational){1,25};  // meaningless
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         avctx_enc->gop_size = INT_MAX;
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         avctx_enc->max_b_frames = 0;
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         avctx_enc->pix_fmt = inlink->format;
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         avctx_enc->flags = CODEC_FLAG_QSCALE | CODEC_FLAG_LOW_DELAY;
         avctx_enc->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
         avctx_enc->global_quality = 123;
         av_dict_set(&opts, "no_bitstream", "1", 0);
         ret = avcodec_open2(avctx_enc, enc, &opts);
         if (ret < 0)
             return ret;
         av_dict_free(&opts);
         av_assert0(avctx_enc->codec);
     }
 
     uspp->outbuf_size = (width + BLOCK) * (height + BLOCK) * 10;
     if (!(uspp->frame = av_frame_alloc()))
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         return AVERROR(ENOMEM);
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     if (!(uspp->outbuf = av_malloc(uspp->outbuf_size)))
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         return AVERROR(ENOMEM);
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     return 0;
 }
 
 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 {
     AVFilterContext *ctx = inlink->dst;
     USPPContext *uspp = ctx->priv;
     AVFilterLink *outlink = ctx->outputs[0];
     AVFrame *out = in;
 
     int qp_stride = 0;
     uint8_t *qp_table = NULL;
 
     /* if we are not in a constant user quantizer mode and we don't want to use
      * the quantizers from the B-frames (B-frames often have a higher QP), we
      * need to save the qp table from the last non B-frame; this is what the
      * following code block does */
     if (!uspp->qp) {
         qp_table = av_frame_get_qp_table(in, &qp_stride, &uspp->qscale_type);
 
         if (qp_table && !uspp->use_bframe_qp && in->pict_type != AV_PICTURE_TYPE_B) {
             int w, h;
 
             /* if the qp stride is not set, it means the QP are only defined on
              * a line basis */
             if (!qp_stride) {
                 w = FF_CEIL_RSHIFT(inlink->w, 4);
                 h = 1;
             } else {
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                 w = qp_stride;
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                 h = FF_CEIL_RSHIFT(inlink->h, 4);
             }
d2d8ac24
 
             if (w * h > uspp->non_b_qp_alloc_size) {
                 int ret = av_reallocp_array(&uspp->non_b_qp_table, w, h);
                 if (ret < 0) {
                     uspp->non_b_qp_alloc_size = 0;
                     return ret;
                 }
                 uspp->non_b_qp_alloc_size = w * h;
             }
 
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             av_assert0(w * h <= uspp->non_b_qp_alloc_size);
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             memcpy(uspp->non_b_qp_table, qp_table, w * h);
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         }
     }
 
     if (uspp->log2_count && !ctx->is_disabled) {
         if (!uspp->use_bframe_qp && uspp->non_b_qp_table)
             qp_table = uspp->non_b_qp_table;
 
         if (qp_table || uspp->qp) {
 
             /* get a new frame if in-place is not possible or if the dimensions
              * are not multiple of 8 */
             if (!av_frame_is_writable(in) || (inlink->w & 7) || (inlink->h & 7)) {
                 const int aligned_w = FFALIGN(inlink->w, 8);
                 const int aligned_h = FFALIGN(inlink->h, 8);
 
                 out = ff_get_video_buffer(outlink, aligned_w, aligned_h);
                 if (!out) {
                     av_frame_free(&in);
                     return AVERROR(ENOMEM);
                 }
                 av_frame_copy_props(out, in);
                 out->width  = in->width;
                 out->height = in->height;
             }
 
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             filter(uspp, out->data, in->data, out->linesize, in->linesize,
                    inlink->w, inlink->h, qp_table, qp_stride);
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         }
     }
 
     if (in != out) {
         if (in->data[3])
             av_image_copy_plane(out->data[3], out->linesize[3],
                                 in ->data[3], in ->linesize[3],
                                 inlink->w, inlink->h);
         av_frame_free(&in);
     }
     return ff_filter_frame(outlink, out);
 }
 
 static av_cold void uninit(AVFilterContext *ctx)
 {
     USPPContext *uspp = ctx->priv;
     int i;
 
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     for (i = 0; i < 3; i++) {
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         av_freep(&uspp->temp[i]);
         av_freep(&uspp->src[i]);
     }
 
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     for (i = 0; i < (1 << uspp->log2_count); i++) {
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         avcodec_close(uspp->avctx_enc[i]);
         av_freep(&uspp->avctx_enc[i]);
     }
 
     av_freep(&uspp->non_b_qp_table);
     av_freep(&uspp->outbuf);
     av_frame_free(&uspp->frame);
 }
 
 static const AVFilterPad uspp_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .config_props = config_input,
         .filter_frame = filter_frame,
     },
     { NULL }
 };
 
 static const AVFilterPad uspp_outputs[] = {
     {
         .name = "default",
         .type = AVMEDIA_TYPE_VIDEO,
     },
     { NULL }
 };
 
 AVFilter ff_vf_uspp = {
     .name            = "uspp",
     .description     = NULL_IF_CONFIG_SMALL("Apply Ultra Simple / Slow Post-processing filter."),
     .priv_size       = sizeof(USPPContext),
     .uninit          = uninit,
     .query_formats   = query_formats,
     .inputs          = uspp_inputs,
     .outputs         = uspp_outputs,
     .priv_class      = &uspp_class,
     .flags           = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
 };