925 lines
28 KiB
C
Executable file
925 lines
28 KiB
C
Executable file
/*
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* Duck TrueMotion 1.0 Decoder
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* Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
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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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/**
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* @file
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* Duck TrueMotion v1 Video Decoder by
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* Alex Beregszaszi and
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* Mike Melanson (melanson@pcisys.net)
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*
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* The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and
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* outputs RGB555 (or RGB565) data. 24-bit TM1 data is not supported yet.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "avcodec.h"
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#include "internal.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mem.h"
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#include "truemotion1data.h"
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typedef struct TrueMotion1Context {
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AVCodecContext *avctx;
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AVFrame *frame;
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const uint8_t *buf;
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int size;
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const uint8_t *mb_change_bits;
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int mb_change_bits_row_size;
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const uint8_t *index_stream;
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int index_stream_size;
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int flags;
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int x, y, w, h;
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uint32_t y_predictor_table[1024];
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uint32_t c_predictor_table[1024];
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uint32_t fat_y_predictor_table[1024];
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uint32_t fat_c_predictor_table[1024];
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int compression;
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int block_type;
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int block_width;
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int block_height;
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int16_t ydt[8];
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int16_t cdt[8];
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int16_t fat_ydt[8];
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int16_t fat_cdt[8];
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int last_deltaset, last_vectable;
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unsigned int *vert_pred;
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int vert_pred_size;
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} TrueMotion1Context;
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#define FLAG_SPRITE 32
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#define FLAG_KEYFRAME 16
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#define FLAG_INTERFRAME 8
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#define FLAG_INTERPOLATED 4
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struct frame_header {
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uint8_t header_size;
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uint8_t compression;
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uint8_t deltaset;
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uint8_t vectable;
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uint16_t ysize;
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uint16_t xsize;
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uint16_t checksum;
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uint8_t version;
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uint8_t header_type;
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uint8_t flags;
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uint8_t control;
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uint16_t xoffset;
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uint16_t yoffset;
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uint16_t width;
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uint16_t height;
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};
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#define ALGO_NOP 0
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#define ALGO_RGB16V 1
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#define ALGO_RGB16H 2
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#define ALGO_RGB24H 3
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/* these are the various block sizes that can occupy a 4x4 block */
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#define BLOCK_2x2 0
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#define BLOCK_2x4 1
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#define BLOCK_4x2 2
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#define BLOCK_4x4 3
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typedef struct comp_types {
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int algorithm;
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int block_width; // vres
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int block_height; // hres
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int block_type;
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} comp_types;
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/* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
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static const comp_types compression_types[17] = {
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{ ALGO_NOP, 0, 0, 0 },
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{ ALGO_RGB16V, 4, 4, BLOCK_4x4 },
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{ ALGO_RGB16H, 4, 4, BLOCK_4x4 },
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{ ALGO_RGB16V, 4, 2, BLOCK_4x2 },
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{ ALGO_RGB16H, 4, 2, BLOCK_4x2 },
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{ ALGO_RGB16V, 2, 4, BLOCK_2x4 },
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{ ALGO_RGB16H, 2, 4, BLOCK_2x4 },
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{ ALGO_RGB16V, 2, 2, BLOCK_2x2 },
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{ ALGO_RGB16H, 2, 2, BLOCK_2x2 },
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{ ALGO_NOP, 4, 4, BLOCK_4x4 },
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{ ALGO_RGB24H, 4, 4, BLOCK_4x4 },
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{ ALGO_NOP, 4, 2, BLOCK_4x2 },
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{ ALGO_RGB24H, 4, 2, BLOCK_4x2 },
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{ ALGO_NOP, 2, 4, BLOCK_2x4 },
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{ ALGO_RGB24H, 2, 4, BLOCK_2x4 },
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{ ALGO_NOP, 2, 2, BLOCK_2x2 },
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{ ALGO_RGB24H, 2, 2, BLOCK_2x2 }
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};
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static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
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{
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int i;
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if (delta_table_index > 3)
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return;
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memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
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memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
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memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
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memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
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/* Y skinny deltas need to be halved for some reason; maybe the
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* skinny Y deltas should be modified */
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for (i = 0; i < 8; i++)
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{
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/* drop the lsb before dividing by 2-- net effect: round down
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* when dividing a negative number (e.g., -3/2 = -2, not -1) */
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s->ydt[i] &= 0xFFFE;
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s->ydt[i] /= 2;
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}
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}
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#if HAVE_BIGENDIAN
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static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
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#else
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static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
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#endif
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{
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int lo, hi;
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lo = ydt[p1];
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lo += (lo * 32) + (lo * 1024);
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hi = ydt[p2];
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hi += (hi * 32) + (hi * 1024);
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return (lo + (hi * (1U << 16))) * 2;
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}
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static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
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{
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int r, b, lo;
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b = cdt[p2];
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r = cdt[p1] * 1024;
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lo = b + r;
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return (lo + (lo * (1U << 16))) * 2;
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}
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#if HAVE_BIGENDIAN
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static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
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#else
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static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
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#endif
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{
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int lo, hi;
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lo = ydt[p1];
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lo += (lo << 6) + (lo << 11);
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hi = ydt[p2];
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hi += (hi << 6) + (hi << 11);
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return (lo + (hi << 16)) << 1;
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}
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static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
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{
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int r, b, lo;
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b = cdt[p2];
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r = cdt[p1] << 11;
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lo = b + r;
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return (lo + (lo * (1 << 16))) * 2;
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}
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static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
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{
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int lo, hi;
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lo = ydt[p1];
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hi = ydt[p2];
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return (lo + (hi * (1 << 8)) + (hi * (1 << 16))) * 2;
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}
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static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
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{
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int r, b;
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b = cdt[p2];
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r = cdt[p1] * (1 << 16);
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return (b+r) * 2;
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}
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static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
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{
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int len, i, j;
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unsigned char delta_pair;
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for (i = 0; i < 1024; i += 4)
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{
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len = *sel_vector_table++ / 2;
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for (j = 0; j < len; j++)
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{
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delta_pair = *sel_vector_table++;
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s->y_predictor_table[i+j] = 0xfffffffe &
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make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
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s->c_predictor_table[i+j] = 0xfffffffe &
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make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
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}
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s->y_predictor_table[i+(j-1)] |= 1;
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s->c_predictor_table[i+(j-1)] |= 1;
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}
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}
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static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
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{
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int len, i, j;
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unsigned char delta_pair;
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for (i = 0; i < 1024; i += 4)
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{
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len = *sel_vector_table++ / 2;
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for (j = 0; j < len; j++)
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{
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delta_pair = *sel_vector_table++;
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s->y_predictor_table[i+j] = 0xfffffffe &
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make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
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s->c_predictor_table[i+j] = 0xfffffffe &
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make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
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}
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s->y_predictor_table[i+(j-1)] |= 1;
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s->c_predictor_table[i+(j-1)] |= 1;
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}
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}
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static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
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{
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int len, i, j;
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unsigned char delta_pair;
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for (i = 0; i < 1024; i += 4)
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{
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len = *sel_vector_table++ / 2;
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for (j = 0; j < len; j++)
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{
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delta_pair = *sel_vector_table++;
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s->y_predictor_table[i+j] = 0xfffffffe &
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make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
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s->c_predictor_table[i+j] = 0xfffffffe &
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make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
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s->fat_y_predictor_table[i+j] = 0xfffffffe &
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make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
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s->fat_c_predictor_table[i+j] = 0xfffffffe &
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make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
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}
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s->y_predictor_table[i+(j-1)] |= 1;
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s->c_predictor_table[i+(j-1)] |= 1;
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s->fat_y_predictor_table[i+(j-1)] |= 1;
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s->fat_c_predictor_table[i+(j-1)] |= 1;
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}
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}
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/* Returns the number of bytes consumed from the bytestream. Returns -1 if
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* there was an error while decoding the header */
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static int truemotion1_decode_header(TrueMotion1Context *s)
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{
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int i, ret;
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int width_shift = 0;
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int new_pix_fmt;
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struct frame_header header;
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uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */
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const uint8_t *sel_vector_table;
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header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
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if (s->buf[0] < 0x10)
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{
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av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
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return AVERROR_INVALIDDATA;
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}
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if (header.header_size + 1 > s->size) {
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av_log(s->avctx, AV_LOG_ERROR, "Input packet too small.\n");
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return AVERROR_INVALIDDATA;
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}
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/* unscramble the header bytes with a XOR operation */
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for (i = 1; i < header.header_size; i++)
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header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
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header.compression = header_buffer[0];
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header.deltaset = header_buffer[1];
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header.vectable = header_buffer[2];
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header.ysize = AV_RL16(&header_buffer[3]);
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header.xsize = AV_RL16(&header_buffer[5]);
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header.checksum = AV_RL16(&header_buffer[7]);
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header.version = header_buffer[9];
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header.header_type = header_buffer[10];
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header.flags = header_buffer[11];
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header.control = header_buffer[12];
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/* Version 2 */
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if (header.version >= 2)
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{
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if (header.header_type > 3)
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{
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av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
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return AVERROR_INVALIDDATA;
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} else if ((header.header_type == 2) || (header.header_type == 3)) {
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s->flags = header.flags;
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if (!(s->flags & FLAG_INTERFRAME))
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s->flags |= FLAG_KEYFRAME;
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} else
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s->flags = FLAG_KEYFRAME;
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} else /* Version 1 */
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s->flags = FLAG_KEYFRAME;
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if (s->flags & FLAG_SPRITE) {
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avpriv_request_sample(s->avctx, "Frame with sprite");
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/* FIXME header.width, height, xoffset and yoffset aren't initialized */
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return AVERROR_PATCHWELCOME;
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} else {
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s->w = header.xsize;
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s->h = header.ysize;
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if (header.header_type < 2) {
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if ((s->w < 213) && (s->h >= 176))
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{
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s->flags |= FLAG_INTERPOLATED;
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avpriv_request_sample(s->avctx, "Interpolated frame");
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}
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}
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}
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if (header.compression >= 17) {
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av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
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return AVERROR_INVALIDDATA;
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}
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if ((header.deltaset != s->last_deltaset) ||
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(header.vectable != s->last_vectable))
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select_delta_tables(s, header.deltaset);
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if ((header.compression & 1) && header.header_type)
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sel_vector_table = pc_tbl2;
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else {
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if (header.vectable > 0 && header.vectable < 4)
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sel_vector_table = tables[header.vectable - 1];
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else {
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av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
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return AVERROR_INVALIDDATA;
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}
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}
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if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
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new_pix_fmt = AV_PIX_FMT_0RGB32;
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width_shift = 1;
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} else
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new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well
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s->w >>= width_shift;
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if (s->w & 1) {
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avpriv_request_sample(s->avctx, "Frame with odd width");
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return AVERROR_PATCHWELCOME;
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}
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if (s->w != s->avctx->width || s->h != s->avctx->height ||
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new_pix_fmt != s->avctx->pix_fmt) {
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av_frame_unref(s->frame);
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s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
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s->avctx->pix_fmt = new_pix_fmt;
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if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0)
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return ret;
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ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
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av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
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if (!s->vert_pred)
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return AVERROR(ENOMEM);
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}
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/* There is 1 change bit per 4 pixels, so each change byte represents
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* 32 pixels; divide width by 4 to obtain the number of change bits and
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* then round up to the nearest byte. */
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s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
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if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
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{
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if (compression_types[header.compression].algorithm == ALGO_RGB24H)
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gen_vector_table24(s, sel_vector_table);
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else
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if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)
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gen_vector_table15(s, sel_vector_table);
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else
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gen_vector_table16(s, sel_vector_table);
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}
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/* set up pointers to the other key data chunks */
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s->mb_change_bits = s->buf + header.header_size;
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if (s->flags & FLAG_KEYFRAME) {
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/* no change bits specified for a keyframe; only index bytes */
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s->index_stream = s->mb_change_bits;
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if (s->avctx->width * s->avctx->height / 2048 + header.header_size > s->size)
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return AVERROR_INVALIDDATA;
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} else {
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/* one change bit per 4x4 block */
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s->index_stream = s->mb_change_bits +
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(s->mb_change_bits_row_size * (s->avctx->height >> 2));
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}
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s->index_stream_size = s->size - (s->index_stream - s->buf);
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s->last_deltaset = header.deltaset;
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s->last_vectable = header.vectable;
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s->compression = header.compression;
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s->block_width = compression_types[header.compression].block_width;
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s->block_height = compression_types[header.compression].block_height;
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s->block_type = compression_types[header.compression].block_type;
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if (s->avctx->debug & FF_DEBUG_PICT_INFO)
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av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
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s->last_deltaset, s->last_vectable, s->compression, s->block_width,
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s->block_height, s->block_type,
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s->flags & FLAG_KEYFRAME ? " KEY" : "",
|
|
s->flags & FLAG_INTERFRAME ? " INTER" : "",
|
|
s->flags & FLAG_SPRITE ? " SPRITE" : "",
|
|
s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
|
|
|
|
return header.header_size;
|
|
}
|
|
|
|
static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
|
|
{
|
|
TrueMotion1Context *s = avctx->priv_data;
|
|
|
|
s->avctx = avctx;
|
|
|
|
// FIXME: it may change ?
|
|
// if (avctx->bits_per_sample == 24)
|
|
// avctx->pix_fmt = AV_PIX_FMT_RGB24;
|
|
// else
|
|
// avctx->pix_fmt = AV_PIX_FMT_RGB555;
|
|
|
|
s->frame = av_frame_alloc();
|
|
if (!s->frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
/* there is a vertical predictor for each pixel in a line; each vertical
|
|
* predictor is 0 to start with */
|
|
av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
|
|
if (!s->vert_pred) {
|
|
av_frame_free(&s->frame);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
Block decoding order:
|
|
|
|
dxi: Y-Y
|
|
dxic: Y-C-Y
|
|
dxic2: Y-C-Y-C
|
|
|
|
hres,vres,i,i%vres (0 < i < 4)
|
|
2x2 0: 0 dxic2
|
|
2x2 1: 1 dxi
|
|
2x2 2: 0 dxic2
|
|
2x2 3: 1 dxi
|
|
2x4 0: 0 dxic2
|
|
2x4 1: 1 dxi
|
|
2x4 2: 2 dxi
|
|
2x4 3: 3 dxi
|
|
4x2 0: 0 dxic
|
|
4x2 1: 1 dxi
|
|
4x2 2: 0 dxic
|
|
4x2 3: 1 dxi
|
|
4x4 0: 0 dxic
|
|
4x4 1: 1 dxi
|
|
4x4 2: 2 dxi
|
|
4x4 3: 3 dxi
|
|
*/
|
|
|
|
#define GET_NEXT_INDEX() \
|
|
{\
|
|
if (index_stream_index >= s->index_stream_size) { \
|
|
av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
|
|
return; \
|
|
} \
|
|
index = s->index_stream[index_stream_index++] * 4; \
|
|
}
|
|
|
|
#define INC_INDEX \
|
|
do { \
|
|
if (index >= 1023) { \
|
|
av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \
|
|
return; \
|
|
} \
|
|
index++; \
|
|
} while (0)
|
|
|
|
#define APPLY_C_PREDICTOR() \
|
|
predictor_pair = s->c_predictor_table[index]; \
|
|
horiz_pred += (predictor_pair >> 1); \
|
|
if (predictor_pair & 1) { \
|
|
GET_NEXT_INDEX() \
|
|
if (!index) { \
|
|
GET_NEXT_INDEX() \
|
|
predictor_pair = s->c_predictor_table[index]; \
|
|
horiz_pred += ((predictor_pair >> 1) * 5); \
|
|
if (predictor_pair & 1) \
|
|
GET_NEXT_INDEX() \
|
|
else \
|
|
INC_INDEX; \
|
|
} \
|
|
} else \
|
|
INC_INDEX;
|
|
|
|
#define APPLY_C_PREDICTOR_24() \
|
|
predictor_pair = s->c_predictor_table[index]; \
|
|
horiz_pred += (predictor_pair >> 1); \
|
|
if (predictor_pair & 1) { \
|
|
GET_NEXT_INDEX() \
|
|
if (!index) { \
|
|
GET_NEXT_INDEX() \
|
|
predictor_pair = s->fat_c_predictor_table[index]; \
|
|
horiz_pred += (predictor_pair >> 1); \
|
|
if (predictor_pair & 1) \
|
|
GET_NEXT_INDEX() \
|
|
else \
|
|
INC_INDEX; \
|
|
} \
|
|
} else \
|
|
INC_INDEX;
|
|
|
|
|
|
#define APPLY_Y_PREDICTOR() \
|
|
predictor_pair = s->y_predictor_table[index]; \
|
|
horiz_pred += (predictor_pair >> 1); \
|
|
if (predictor_pair & 1) { \
|
|
GET_NEXT_INDEX() \
|
|
if (!index) { \
|
|
GET_NEXT_INDEX() \
|
|
predictor_pair = s->y_predictor_table[index]; \
|
|
horiz_pred += ((predictor_pair >> 1) * 5); \
|
|
if (predictor_pair & 1) \
|
|
GET_NEXT_INDEX() \
|
|
else \
|
|
INC_INDEX; \
|
|
} \
|
|
} else \
|
|
INC_INDEX;
|
|
|
|
#define APPLY_Y_PREDICTOR_24() \
|
|
predictor_pair = s->y_predictor_table[index]; \
|
|
horiz_pred += (predictor_pair >> 1); \
|
|
if (predictor_pair & 1) { \
|
|
GET_NEXT_INDEX() \
|
|
if (!index) { \
|
|
GET_NEXT_INDEX() \
|
|
predictor_pair = s->fat_y_predictor_table[index]; \
|
|
horiz_pred += (predictor_pair >> 1); \
|
|
if (predictor_pair & 1) \
|
|
GET_NEXT_INDEX() \
|
|
else \
|
|
INC_INDEX; \
|
|
} \
|
|
} else \
|
|
INC_INDEX;
|
|
|
|
#define OUTPUT_PIXEL_PAIR() \
|
|
*current_pixel_pair = *vert_pred + horiz_pred; \
|
|
*vert_pred++ = *current_pixel_pair++;
|
|
|
|
static void truemotion1_decode_16bit(TrueMotion1Context *s)
|
|
{
|
|
int y;
|
|
int pixels_left; /* remaining pixels on this line */
|
|
unsigned int predictor_pair;
|
|
unsigned int horiz_pred;
|
|
unsigned int *vert_pred;
|
|
unsigned int *current_pixel_pair;
|
|
unsigned char *current_line = s->frame->data[0];
|
|
int keyframe = s->flags & FLAG_KEYFRAME;
|
|
|
|
/* these variables are for managing the stream of macroblock change bits */
|
|
const unsigned char *mb_change_bits = s->mb_change_bits;
|
|
unsigned char mb_change_byte;
|
|
unsigned char mb_change_byte_mask;
|
|
int mb_change_index;
|
|
|
|
/* these variables are for managing the main index stream */
|
|
int index_stream_index = 0; /* yes, the index into the index stream */
|
|
int index;
|
|
|
|
/* clean out the line buffer */
|
|
memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
|
|
|
|
GET_NEXT_INDEX();
|
|
|
|
for (y = 0; y < s->avctx->height; y++) {
|
|
|
|
/* re-init variables for the next line iteration */
|
|
horiz_pred = 0;
|
|
current_pixel_pair = (unsigned int *)current_line;
|
|
vert_pred = s->vert_pred;
|
|
mb_change_index = 0;
|
|
if (!keyframe)
|
|
mb_change_byte = mb_change_bits[mb_change_index++];
|
|
mb_change_byte_mask = 0x01;
|
|
pixels_left = s->avctx->width;
|
|
|
|
while (pixels_left > 0) {
|
|
|
|
if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
|
|
|
|
switch (y & 3) {
|
|
case 0:
|
|
/* if macroblock width is 2, apply C-Y-C-Y; else
|
|
* apply C-Y-Y */
|
|
if (s->block_width == 2) {
|
|
APPLY_C_PREDICTOR();
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_C_PREDICTOR();
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
} else {
|
|
APPLY_C_PREDICTOR();
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
}
|
|
break;
|
|
|
|
case 1:
|
|
case 3:
|
|
/* always apply 2 Y predictors on these iterations */
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
break;
|
|
|
|
case 2:
|
|
/* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
|
|
* depending on the macroblock type */
|
|
if (s->block_type == BLOCK_2x2) {
|
|
APPLY_C_PREDICTOR();
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_C_PREDICTOR();
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
} else if (s->block_type == BLOCK_4x2) {
|
|
APPLY_C_PREDICTOR();
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
} else {
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_Y_PREDICTOR();
|
|
OUTPUT_PIXEL_PAIR();
|
|
}
|
|
break;
|
|
}
|
|
|
|
} else {
|
|
|
|
/* skip (copy) four pixels, but reassign the horizontal
|
|
* predictor */
|
|
*vert_pred++ = *current_pixel_pair++;
|
|
horiz_pred = *current_pixel_pair - *vert_pred;
|
|
*vert_pred++ = *current_pixel_pair++;
|
|
|
|
}
|
|
|
|
if (!keyframe) {
|
|
mb_change_byte_mask <<= 1;
|
|
|
|
/* next byte */
|
|
if (!mb_change_byte_mask) {
|
|
mb_change_byte = mb_change_bits[mb_change_index++];
|
|
mb_change_byte_mask = 0x01;
|
|
}
|
|
}
|
|
|
|
pixels_left -= 4;
|
|
}
|
|
|
|
/* next change row */
|
|
if (((y + 1) & 3) == 0)
|
|
mb_change_bits += s->mb_change_bits_row_size;
|
|
|
|
current_line += s->frame->linesize[0];
|
|
}
|
|
}
|
|
|
|
static void truemotion1_decode_24bit(TrueMotion1Context *s)
|
|
{
|
|
int y;
|
|
int pixels_left; /* remaining pixels on this line */
|
|
unsigned int predictor_pair;
|
|
unsigned int horiz_pred;
|
|
unsigned int *vert_pred;
|
|
unsigned int *current_pixel_pair;
|
|
unsigned char *current_line = s->frame->data[0];
|
|
int keyframe = s->flags & FLAG_KEYFRAME;
|
|
|
|
/* these variables are for managing the stream of macroblock change bits */
|
|
const unsigned char *mb_change_bits = s->mb_change_bits;
|
|
unsigned char mb_change_byte;
|
|
unsigned char mb_change_byte_mask;
|
|
int mb_change_index;
|
|
|
|
/* these variables are for managing the main index stream */
|
|
int index_stream_index = 0; /* yes, the index into the index stream */
|
|
int index;
|
|
|
|
/* clean out the line buffer */
|
|
memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
|
|
|
|
GET_NEXT_INDEX();
|
|
|
|
for (y = 0; y < s->avctx->height; y++) {
|
|
|
|
/* re-init variables for the next line iteration */
|
|
horiz_pred = 0;
|
|
current_pixel_pair = (unsigned int *)current_line;
|
|
vert_pred = s->vert_pred;
|
|
mb_change_index = 0;
|
|
mb_change_byte = mb_change_bits[mb_change_index++];
|
|
mb_change_byte_mask = 0x01;
|
|
pixels_left = s->avctx->width;
|
|
|
|
while (pixels_left > 0) {
|
|
|
|
if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
|
|
|
|
switch (y & 3) {
|
|
case 0:
|
|
/* if macroblock width is 2, apply C-Y-C-Y; else
|
|
* apply C-Y-Y */
|
|
if (s->block_width == 2) {
|
|
APPLY_C_PREDICTOR_24();
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_C_PREDICTOR_24();
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
} else {
|
|
APPLY_C_PREDICTOR_24();
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
}
|
|
break;
|
|
|
|
case 1:
|
|
case 3:
|
|
/* always apply 2 Y predictors on these iterations */
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
break;
|
|
|
|
case 2:
|
|
/* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
|
|
* depending on the macroblock type */
|
|
if (s->block_type == BLOCK_2x2) {
|
|
APPLY_C_PREDICTOR_24();
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_C_PREDICTOR_24();
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
} else if (s->block_type == BLOCK_4x2) {
|
|
APPLY_C_PREDICTOR_24();
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
} else {
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
APPLY_Y_PREDICTOR_24();
|
|
OUTPUT_PIXEL_PAIR();
|
|
}
|
|
break;
|
|
}
|
|
|
|
} else {
|
|
|
|
/* skip (copy) four pixels, but reassign the horizontal
|
|
* predictor */
|
|
*vert_pred++ = *current_pixel_pair++;
|
|
horiz_pred = *current_pixel_pair - *vert_pred;
|
|
*vert_pred++ = *current_pixel_pair++;
|
|
|
|
}
|
|
|
|
if (!keyframe) {
|
|
mb_change_byte_mask <<= 1;
|
|
|
|
/* next byte */
|
|
if (!mb_change_byte_mask) {
|
|
mb_change_byte = mb_change_bits[mb_change_index++];
|
|
mb_change_byte_mask = 0x01;
|
|
}
|
|
}
|
|
|
|
pixels_left -= 2;
|
|
}
|
|
|
|
/* next change row */
|
|
if (((y + 1) & 3) == 0)
|
|
mb_change_bits += s->mb_change_bits_row_size;
|
|
|
|
current_line += s->frame->linesize[0];
|
|
}
|
|
}
|
|
|
|
|
|
static int truemotion1_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *got_frame,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int ret, buf_size = avpkt->size;
|
|
TrueMotion1Context *s = avctx->priv_data;
|
|
|
|
s->buf = buf;
|
|
s->size = buf_size;
|
|
|
|
if ((ret = truemotion1_decode_header(s)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
|
|
return ret;
|
|
|
|
if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
|
|
truemotion1_decode_24bit(s);
|
|
} else if (compression_types[s->compression].algorithm != ALGO_NOP) {
|
|
truemotion1_decode_16bit(s);
|
|
}
|
|
|
|
if ((ret = av_frame_ref(data, s->frame)) < 0)
|
|
return ret;
|
|
|
|
*got_frame = 1;
|
|
|
|
/* report that the buffer was completely consumed */
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
|
|
{
|
|
TrueMotion1Context *s = avctx->priv_data;
|
|
|
|
av_frame_free(&s->frame);
|
|
av_freep(&s->vert_pred);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_truemotion1_decoder = {
|
|
.name = "truemotion1",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_TRUEMOTION1,
|
|
.priv_data_size = sizeof(TrueMotion1Context),
|
|
.init = truemotion1_decode_init,
|
|
.close = truemotion1_decode_end,
|
|
.decode = truemotion1_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|