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497 lines
15 KiB
C
Executable File
497 lines
15 KiB
C
Executable File
/*
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* Mirillis FIC decoder
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*
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* Copyright (c) 2014 Konstantin Shishkov
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* Copyright (c) 2014 Derek Buitenhuis
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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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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "get_bits.h"
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#include "golomb.h"
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typedef struct FICThreadContext {
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DECLARE_ALIGNED(16, int16_t, block)[64];
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uint8_t *src;
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int slice_h;
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int src_size;
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int y_off;
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int p_frame;
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} FICThreadContext;
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typedef struct FICContext {
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AVClass *class;
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AVCodecContext *avctx;
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AVFrame *frame;
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AVFrame *final_frame;
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FICThreadContext *slice_data;
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int slice_data_size;
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const uint8_t *qmat;
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enum AVPictureType cur_frame_type;
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int aligned_width, aligned_height;
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int num_slices, slice_h;
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uint8_t cursor_buf[4096];
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int skip_cursor;
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} FICContext;
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static const uint8_t fic_qmat_hq[64] = {
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1, 2, 2, 2, 3, 3, 3, 4,
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2, 2, 2, 3, 3, 3, 4, 4,
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2, 2, 3, 3, 3, 4, 4, 4,
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2, 2, 3, 3, 3, 4, 4, 5,
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2, 3, 3, 3, 4, 4, 5, 6,
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3, 3, 3, 4, 4, 5, 6, 7,
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3, 3, 3, 4, 4, 5, 7, 7,
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3, 3, 4, 4, 5, 7, 7, 7,
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};
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static const uint8_t fic_qmat_lq[64] = {
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1, 5, 6, 7, 8, 9, 9, 11,
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5, 5, 7, 8, 9, 9, 11, 12,
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6, 7, 8, 9, 9, 11, 11, 12,
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7, 7, 8, 9, 9, 11, 12, 13,
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7, 8, 9, 9, 10, 11, 13, 16,
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8, 9, 9, 10, 11, 13, 16, 19,
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8, 9, 9, 11, 12, 15, 18, 23,
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9, 9, 11, 12, 15, 18, 23, 27
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};
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static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
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#define FIC_HEADER_SIZE 27
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#define CURSOR_OFFSET 59
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static av_always_inline void fic_idct(int16_t *blk, int step, int shift, int rnd)
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{
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const unsigned t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
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const unsigned t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
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const unsigned t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
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const unsigned t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
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const unsigned t4 = 5793U * ((int)(t2 + t0 + 0x800) >> 12);
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const unsigned t5 = 5793U * ((int)(t3 + t1 + 0x800) >> 12);
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const unsigned t6 = t2 - t0;
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const unsigned t7 = t3 - t1;
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const unsigned t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
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const unsigned t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
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const unsigned tA = (blk[0 * step] - blk[4 * step]) * 32768 + rnd;
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const unsigned tB = (blk[0 * step] + blk[4 * step]) * 32768 + rnd;
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blk[0 * step] = (int)( t4 + t9 + tB) >> shift;
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blk[1 * step] = (int)( t6 + t7 + t8 + tA) >> shift;
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blk[2 * step] = (int)( t6 - t7 - t8 + tA) >> shift;
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blk[3 * step] = (int)( t5 - t9 + tB) >> shift;
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blk[4 * step] = (int)( -t5 - t9 + tB) >> shift;
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blk[5 * step] = (int)(-(t6 - t7) - t8 + tA) >> shift;
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blk[6 * step] = (int)(-(t6 + t7) + t8 + tA) >> shift;
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blk[7 * step] = (int)( -t4 + t9 + tB) >> shift;
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}
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static void fic_idct_put(uint8_t *dst, int stride, int16_t *block)
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{
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int i, j;
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int16_t *ptr;
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ptr = block;
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fic_idct(ptr++, 8, 13, (1 << 12) + (1 << 17));
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for (i = 1; i < 8; i++) {
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fic_idct(ptr, 8, 13, 1 << 12);
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ptr++;
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}
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ptr = block;
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for (i = 0; i < 8; i++) {
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fic_idct(ptr, 1, 20, 0);
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ptr += 8;
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}
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ptr = block;
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for (j = 0; j < 8; j++) {
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for (i = 0; i < 8; i++)
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dst[i] = av_clip_uint8(ptr[i]);
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dst += stride;
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ptr += 8;
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}
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}
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static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
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uint8_t *dst, int stride, int16_t *block, int *is_p)
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{
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int i, num_coeff;
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if (get_bits_left(gb) < 8)
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return AVERROR_INVALIDDATA;
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/* Is it a skip block? */
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if (get_bits1(gb)) {
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*is_p = 1;
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return 0;
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}
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memset(block, 0, sizeof(*block) * 64);
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num_coeff = get_bits(gb, 7);
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if (num_coeff > 64)
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return AVERROR_INVALIDDATA;
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for (i = 0; i < num_coeff; i++) {
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int v = get_se_golomb(gb);
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if (v < -2048 || v > 2048)
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return AVERROR_INVALIDDATA;
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block[ff_zigzag_direct[i]] = v *
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ctx->qmat[ff_zigzag_direct[i]];
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}
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fic_idct_put(dst, stride, block);
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return 0;
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}
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static int fic_decode_slice(AVCodecContext *avctx, void *tdata)
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{
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FICContext *ctx = avctx->priv_data;
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FICThreadContext *tctx = tdata;
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GetBitContext gb;
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uint8_t *src = tctx->src;
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int slice_h = tctx->slice_h;
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int src_size = tctx->src_size;
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int y_off = tctx->y_off;
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int x, y, p, ret;
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ret = init_get_bits8(&gb, src, src_size);
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if (ret < 0)
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return ret;
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for (p = 0; p < 3; p++) {
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int stride = ctx->frame->linesize[p];
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uint8_t* dst = ctx->frame->data[p] + (y_off >> !!p) * stride;
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for (y = 0; y < (slice_h >> !!p); y += 8) {
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for (x = 0; x < (ctx->aligned_width >> !!p); x += 8) {
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int ret;
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if ((ret = fic_decode_block(ctx, &gb, dst + x, stride,
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tctx->block, &tctx->p_frame)) != 0)
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return ret;
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}
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dst += 8 * stride;
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}
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}
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return 0;
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}
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static av_always_inline void fic_alpha_blend(uint8_t *dst, uint8_t *src,
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int size, uint8_t *alpha)
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{
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int i;
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for (i = 0; i < size; i++)
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dst[i] += ((src[i] - dst[i]) * alpha[i]) >> 8;
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}
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static void fic_draw_cursor(AVCodecContext *avctx, int cur_x, int cur_y)
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{
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FICContext *ctx = avctx->priv_data;
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uint8_t *ptr = ctx->cursor_buf;
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uint8_t *dstptr[3];
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uint8_t planes[4][1024];
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uint8_t chroma[3][256];
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int i, j, p;
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/* Convert to YUVA444. */
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for (i = 0; i < 1024; i++) {
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planes[0][i] = (( 25 * ptr[0] + 129 * ptr[1] + 66 * ptr[2]) / 255) + 16;
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planes[1][i] = ((-38 * ptr[0] + 112 * ptr[1] + -74 * ptr[2]) / 255) + 128;
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planes[2][i] = ((-18 * ptr[0] + 112 * ptr[1] + -94 * ptr[2]) / 255) + 128;
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planes[3][i] = ptr[3];
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ptr += 4;
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}
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/* Subsample chroma. */
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for (i = 0; i < 32; i += 2)
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for (j = 0; j < 32; j += 2)
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for (p = 0; p < 3; p++)
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chroma[p][16 * (i / 2) + j / 2] = (planes[p + 1][32 * i + j ] +
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planes[p + 1][32 * i + j + 1] +
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planes[p + 1][32 * (i + 1) + j ] +
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planes[p + 1][32 * (i + 1) + j + 1]) / 4;
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/* Seek to x/y pos of cursor. */
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for (i = 0; i < 3; i++)
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dstptr[i] = ctx->final_frame->data[i] +
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(ctx->final_frame->linesize[i] * (cur_y >> !!i)) +
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(cur_x >> !!i) + !!i;
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/* Copy. */
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for (i = 0; i < FFMIN(32, avctx->height - cur_y) - 1; i += 2) {
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int lsize = FFMIN(32, avctx->width - cur_x);
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int csize = lsize / 2;
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fic_alpha_blend(dstptr[0],
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planes[0] + i * 32, lsize, planes[3] + i * 32);
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fic_alpha_blend(dstptr[0] + ctx->final_frame->linesize[0],
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planes[0] + (i + 1) * 32, lsize, planes[3] + (i + 1) * 32);
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fic_alpha_blend(dstptr[1],
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chroma[0] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
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fic_alpha_blend(dstptr[2],
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chroma[1] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
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dstptr[0] += ctx->final_frame->linesize[0] * 2;
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dstptr[1] += ctx->final_frame->linesize[1];
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dstptr[2] += ctx->final_frame->linesize[2];
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}
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}
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static int fic_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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FICContext *ctx = avctx->priv_data;
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uint8_t *src = avpkt->data;
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int ret;
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int slice, nslices;
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int msize;
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int tsize;
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int cur_x, cur_y;
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int skip_cursor = ctx->skip_cursor;
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uint8_t *sdata;
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if ((ret = ff_reget_buffer(avctx, ctx->frame, 0)) < 0)
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return ret;
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/* Header + at least one slice (4) */
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if (avpkt->size < FIC_HEADER_SIZE + 4) {
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av_log(avctx, AV_LOG_ERROR, "Frame data is too small.\n");
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return AVERROR_INVALIDDATA;
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}
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/* Check for header. */
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if (memcmp(src, fic_header, 7))
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av_log(avctx, AV_LOG_WARNING, "Invalid FIC Header.\n");
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/* Is it a skip frame? */
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if (src[17]) {
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if (!ctx->final_frame) {
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av_log(avctx, AV_LOG_WARNING, "Initial frame is skipped\n");
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return AVERROR_INVALIDDATA;
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}
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goto skip;
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}
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nslices = src[13];
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if (!nslices) {
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av_log(avctx, AV_LOG_ERROR, "Zero slices found.\n");
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return AVERROR_INVALIDDATA;
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}
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/* High or Low Quality Matrix? */
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ctx->qmat = src[23] ? fic_qmat_hq : fic_qmat_lq;
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/* Skip cursor data. */
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tsize = AV_RB24(src + 24);
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if (tsize > avpkt->size - FIC_HEADER_SIZE) {
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av_log(avctx, AV_LOG_ERROR,
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"Packet is too small to contain cursor (%d vs %d bytes).\n",
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tsize, avpkt->size - FIC_HEADER_SIZE);
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return AVERROR_INVALIDDATA;
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}
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if (!tsize || !AV_RL16(src + 37) || !AV_RL16(src + 39))
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skip_cursor = 1;
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if (!skip_cursor && tsize < 32) {
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av_log(avctx, AV_LOG_WARNING,
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"Cursor data too small. Skipping cursor.\n");
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skip_cursor = 1;
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}
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/* Cursor position. */
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cur_x = AV_RL16(src + 33);
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cur_y = AV_RL16(src + 35);
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if (!skip_cursor && (cur_x > avctx->width || cur_y > avctx->height)) {
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av_log(avctx, AV_LOG_DEBUG,
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"Invalid cursor position: (%d,%d). Skipping cursor.\n",
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cur_x, cur_y);
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skip_cursor = 1;
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}
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if (!skip_cursor && (AV_RL16(src + 37) != 32 || AV_RL16(src + 39) != 32)) {
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av_log(avctx, AV_LOG_WARNING,
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"Invalid cursor size. Skipping cursor.\n");
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skip_cursor = 1;
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}
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if (!skip_cursor && avpkt->size < CURSOR_OFFSET + sizeof(ctx->cursor_buf)) {
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skip_cursor = 1;
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}
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/* Slice height for all but the last slice. */
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ctx->slice_h = 16 * (ctx->aligned_height >> 4) / nslices;
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if (ctx->slice_h % 16)
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ctx->slice_h = FFALIGN(ctx->slice_h - 16, 16);
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/* First slice offset and remaining data. */
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sdata = src + tsize + FIC_HEADER_SIZE + 4 * nslices;
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msize = avpkt->size - nslices * 4 - tsize - FIC_HEADER_SIZE;
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if (msize <= ctx->aligned_width/8 * (ctx->aligned_height/8) / 8) {
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av_log(avctx, AV_LOG_ERROR, "Not enough frame data to decode.\n");
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return AVERROR_INVALIDDATA;
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}
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/* Allocate slice data. */
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av_fast_malloc(&ctx->slice_data, &ctx->slice_data_size,
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nslices * sizeof(ctx->slice_data[0]));
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if (!ctx->slice_data_size) {
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av_log(avctx, AV_LOG_ERROR, "Could not allocate slice data.\n");
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return AVERROR(ENOMEM);
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}
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memset(ctx->slice_data, 0, nslices * sizeof(ctx->slice_data[0]));
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for (slice = 0; slice < nslices; slice++) {
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unsigned slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
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unsigned slice_size;
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int y_off = ctx->slice_h * slice;
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int slice_h = ctx->slice_h;
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/*
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* Either read the slice size, or consume all data left.
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* Also, special case the last slight height.
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*/
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if (slice == nslices - 1) {
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slice_size = msize;
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slice_h = FFALIGN(avctx->height - ctx->slice_h * (nslices - 1), 16);
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} else {
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slice_size = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4 + 4);
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if (slice_size < slice_off)
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return AVERROR_INVALIDDATA;
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}
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if (slice_size < slice_off || slice_size > msize)
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continue;
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slice_size -= slice_off;
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ctx->slice_data[slice].src = sdata + slice_off;
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ctx->slice_data[slice].src_size = slice_size;
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ctx->slice_data[slice].slice_h = slice_h;
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ctx->slice_data[slice].y_off = y_off;
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}
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if ((ret = avctx->execute(avctx, fic_decode_slice, ctx->slice_data,
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NULL, nslices, sizeof(ctx->slice_data[0]))) < 0)
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return ret;
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ctx->frame->key_frame = 1;
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ctx->frame->pict_type = AV_PICTURE_TYPE_I;
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for (slice = 0; slice < nslices; slice++) {
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if (ctx->slice_data[slice].p_frame) {
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ctx->frame->key_frame = 0;
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ctx->frame->pict_type = AV_PICTURE_TYPE_P;
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break;
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}
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}
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av_frame_free(&ctx->final_frame);
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ctx->final_frame = av_frame_clone(ctx->frame);
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if (!ctx->final_frame) {
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av_log(avctx, AV_LOG_ERROR, "Could not clone frame buffer.\n");
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return AVERROR(ENOMEM);
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}
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/* Make sure we use a user-supplied buffer. */
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if ((ret = ff_reget_buffer(avctx, ctx->final_frame, 0)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "Could not make frame writable.\n");
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return ret;
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}
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/* Draw cursor. */
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if (!skip_cursor) {
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memcpy(ctx->cursor_buf, src + CURSOR_OFFSET, sizeof(ctx->cursor_buf));
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fic_draw_cursor(avctx, cur_x, cur_y);
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}
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skip:
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*got_frame = 1;
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if ((ret = av_frame_ref(data, ctx->final_frame)) < 0)
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return ret;
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return avpkt->size;
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}
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static av_cold int fic_decode_close(AVCodecContext *avctx)
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{
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FICContext *ctx = avctx->priv_data;
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av_freep(&ctx->slice_data);
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av_frame_free(&ctx->final_frame);
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av_frame_free(&ctx->frame);
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return 0;
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}
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static av_cold int fic_decode_init(AVCodecContext *avctx)
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{
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FICContext *ctx = avctx->priv_data;
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/* Initialize various context values */
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ctx->avctx = avctx;
|
|
ctx->aligned_width = FFALIGN(avctx->width, 16);
|
|
ctx->aligned_height = FFALIGN(avctx->height, 16);
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
|
|
avctx->bits_per_raw_sample = 8;
|
|
|
|
ctx->frame = av_frame_alloc();
|
|
if (!ctx->frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const AVOption options[] = {
|
|
{ "skip_cursor", "skip the cursor", offsetof(FICContext, skip_cursor), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass fic_decoder_class = {
|
|
.class_name = "FIC decoder",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVCodec ff_fic_decoder = {
|
|
.name = "fic",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Mirillis FIC"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_FIC,
|
|
.priv_data_size = sizeof(FICContext),
|
|
.init = fic_decode_init,
|
|
.decode = fic_decode_frame,
|
|
.close = fic_decode_close,
|
|
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
|
|
.priv_class = &fic_decoder_class,
|
|
};
|