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459 lines
14 KiB
C
459 lines
14 KiB
C
/*
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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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "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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} FICThreadContext;
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typedef struct FICContext {
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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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} 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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static av_always_inline void fic_idct(int16_t *blk, int step, int shift)
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{
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const int t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
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const int t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
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const int t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
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const int t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
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const int t4 = 5793 * (t2 + t0 + 0x800 >> 12);
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const int t5 = 5793 * (t3 + t1 + 0x800 >> 12);
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const int t6 = t2 - t0;
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const int t7 = t3 - t1;
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const int t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
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const int t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
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const int tA = (blk[0 * step] - blk[4 * step] << 15) + (1 << shift - 1);
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const int tB = (blk[0 * step] + blk[4 * step] << 15) + (1 << shift - 1);
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blk[0 * step] = ( t4 + t9 + tB) >> shift;
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blk[1 * step] = ( t6 + t7 + t8 + tA) >> shift;
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blk[2 * step] = ( t6 - t7 - t8 + tA) >> shift;
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blk[3 * step] = ( t5 - t9 + tB) >> shift;
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blk[4 * step] = ( -t5 - t9 + tB) >> shift;
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blk[5 * step] = (-(t6 - t7) - t8 + tA) >> shift;
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blk[6 * step] = (-(t6 + t7) + t8 + tA) >> shift;
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blk[7 * step] = ( -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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for (i = 0; i < 8; i++) {
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fic_idct(ptr, 8, 13);
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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);
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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)
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{
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int i, num_coeff;
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/* Is it a skip block? */
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if (get_bits1(gb)) {
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/* This is a 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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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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block[ff_zigzag_direct[i]] = get_se_golomb(gb) *
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ctx->qmat[ff_zigzag_direct[i]];
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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;
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init_get_bits(&gb, src, src_size * 8);
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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, tctx->block)) != 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 = 0;
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uint8_t *sdata;
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if ((ret = ff_reget_buffer(avctx, ctx->frame)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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return ret;
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}
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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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goto skip;
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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 < 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 (cur_x > avctx->width || cur_y > avctx->height) {
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av_log(avctx, AV_LOG_WARNING,
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"Invalid cursor position: (%d,%d). Skipping cusor.\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 (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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/* 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 <= 0) {
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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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/*
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* Set the frametype to I initially. It will be set to P if the frame
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* has any dependencies (skip blocks). There will be a race condition
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* inside the slice decode function to set these, but we do not care.
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* since they will only ever be set to 0/P.
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*/
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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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/* 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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}
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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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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) {
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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 + 59, 32 * 32 * 4);
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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;
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ctx->aligned_width = FFALIGN(avctx->width, 16);
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ctx->aligned_height = FFALIGN(avctx->height, 16);
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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avctx->bits_per_raw_sample = 8;
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ctx->frame = av_frame_alloc();
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if (!ctx->frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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AVCodec ff_fic_decoder = {
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.name = "fic",
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.long_name = NULL_IF_CONFIG_SMALL("Mirillis FIC"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_FIC,
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.priv_data_size = sizeof(FICContext),
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.init = fic_decode_init,
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.decode = fic_decode_frame,
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.close = fic_decode_close,
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.capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
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};
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