mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-24 03:59:43 +00:00
772 lines
24 KiB
C
772 lines
24 KiB
C
/*
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* Smacker decoder
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* Copyright (c) 2006 Konstantin Shishkov
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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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/**
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* @file
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* Smacker decoder
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*/
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/*
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* Based on http://wiki.multimedia.cx/index.php?title=Smacker
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "libavutil/channel_layout.h"
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#define BITSTREAM_READER_LE
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#include "avcodec.h"
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#include "bitstream.h"
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#include "bytestream.h"
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#include "internal.h"
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#include "mathops.h"
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#define SMKTREE_BITS 9
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#define SMK_NODE 0x80000000
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typedef struct SmackVContext {
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AVCodecContext *avctx;
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AVFrame *pic;
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int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;
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int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
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} SmackVContext;
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/**
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* Context used for code reconstructing
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*/
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typedef struct HuffContext {
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int length;
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int maxlength;
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int current;
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uint32_t *bits;
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int *lengths;
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int *values;
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} HuffContext;
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/* common parameters used for decode_bigtree */
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typedef struct DBCtx {
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VLC *v1, *v2;
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int *recode1, *recode2;
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int escapes[3];
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int *last;
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int lcur;
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} DBCtx;
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/* possible runs of blocks */
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static const int block_runs[64] = {
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1, 2, 3, 4, 5, 6, 7, 8,
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9, 10, 11, 12, 13, 14, 15, 16,
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17, 18, 19, 20, 21, 22, 23, 24,
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25, 26, 27, 28, 29, 30, 31, 32,
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33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48,
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49, 50, 51, 52, 53, 54, 55, 56,
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57, 58, 59, 128, 256, 512, 1024, 2048 };
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enum SmkBlockTypes {
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SMK_BLK_MONO = 0,
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SMK_BLK_FULL = 1,
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SMK_BLK_SKIP = 2,
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SMK_BLK_FILL = 3 };
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/**
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* Decode local frame tree
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*/
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static int smacker_decode_tree(BitstreamContext *bc, HuffContext *hc,
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uint32_t prefix, int length)
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{
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if (!bitstream_read_bit(bc)) { // Leaf
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if(hc->current >= 256){
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av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
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return -1;
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}
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if(length){
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hc->bits[hc->current] = prefix;
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hc->lengths[hc->current] = length;
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} else {
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hc->bits[hc->current] = 0;
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hc->lengths[hc->current] = 0;
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}
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hc->values[hc->current] = bitstream_read(bc, 8);
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hc->current++;
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if(hc->maxlength < length)
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hc->maxlength = length;
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return 0;
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} else { //Node
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int r;
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length++;
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r = smacker_decode_tree(bc, hc, prefix, length);
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if(r)
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return r;
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return smacker_decode_tree(bc, hc, prefix | (1 << (length - 1)), length);
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}
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}
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/**
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* Decode header tree
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*/
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static int smacker_decode_bigtree(BitstreamContext *bc, HuffContext *hc,
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DBCtx *ctx)
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{
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if (hc->current + 1 >= hc->length) {
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av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
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return -1;
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}
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if (!bitstream_read_bit(bc)) { // Leaf
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int val, i1, i2;
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i1 = ctx->v1->table ? bitstream_read_vlc(bc, ctx->v1->table, SMKTREE_BITS, 3) : 0;
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i2 = ctx->v2->table ? bitstream_read_vlc(bc, ctx->v2->table, SMKTREE_BITS, 3) : 0;
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if (i1 < 0 || i2 < 0)
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return -1;
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val = ctx->recode1[i1] | (ctx->recode2[i2] << 8);
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if(val == ctx->escapes[0]) {
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ctx->last[0] = hc->current;
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val = 0;
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} else if(val == ctx->escapes[1]) {
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ctx->last[1] = hc->current;
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val = 0;
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} else if(val == ctx->escapes[2]) {
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ctx->last[2] = hc->current;
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val = 0;
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}
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hc->values[hc->current++] = val;
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return 1;
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} else { //Node
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int r = 0, r_new, t;
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t = hc->current++;
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r = smacker_decode_bigtree(bc, hc, ctx);
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if(r < 0)
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return r;
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hc->values[t] = SMK_NODE | r;
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r++;
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r_new = smacker_decode_bigtree(bc, hc, ctx);
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if (r_new < 0)
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return r_new;
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return r + r_new;
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}
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}
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/**
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* Store large tree as Libav's vlc codes
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*/
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static int smacker_decode_header_tree(SmackVContext *smk, BitstreamContext *bc,
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int **recodes, int *last, int size)
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{
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int res;
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HuffContext huff;
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HuffContext tmp1, tmp2;
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VLC vlc[2] = { { 0 } };
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int escapes[3];
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DBCtx ctx;
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int err = 0;
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if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow
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av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");
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return -1;
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}
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tmp1.length = 256;
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tmp1.maxlength = 0;
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tmp1.current = 0;
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tmp1.bits = av_mallocz(256 * 4);
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tmp1.lengths = av_mallocz(256 * sizeof(int));
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tmp1.values = av_mallocz(256 * sizeof(int));
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tmp2.length = 256;
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tmp2.maxlength = 0;
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tmp2.current = 0;
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tmp2.bits = av_mallocz(256 * 4);
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tmp2.lengths = av_mallocz(256 * sizeof(int));
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tmp2.values = av_mallocz(256 * sizeof(int));
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if (!tmp1.bits || !tmp1.lengths || !tmp1.values ||
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!tmp2.bits || !tmp2.lengths || !tmp2.values) {
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err = AVERROR(ENOMEM);
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goto error;
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}
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if (bitstream_read_bit(bc)) {
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smacker_decode_tree(bc, &tmp1, 0, 0);
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bitstream_skip(bc, 1);
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res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length,
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tmp1.lengths, sizeof(int), sizeof(int),
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tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
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if(res < 0) {
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av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
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err = res;
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goto error;
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}
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} else {
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av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n");
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}
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if (bitstream_read_bit(bc)) {
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smacker_decode_tree(bc, &tmp2, 0, 0);
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bitstream_skip(bc, 1);
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res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length,
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tmp2.lengths, sizeof(int), sizeof(int),
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tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
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if(res < 0) {
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av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
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err = res;
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goto error;
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}
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} else {
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av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n");
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}
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escapes[0] = bitstream_read(bc, 8);
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escapes[0] |= bitstream_read(bc, 8) << 8;
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escapes[1] = bitstream_read(bc, 8);
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escapes[1] |= bitstream_read(bc, 8) << 8;
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escapes[2] = bitstream_read(bc, 8);
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escapes[2] |= bitstream_read(bc, 8) << 8;
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last[0] = last[1] = last[2] = -1;
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ctx.escapes[0] = escapes[0];
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ctx.escapes[1] = escapes[1];
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ctx.escapes[2] = escapes[2];
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ctx.v1 = &vlc[0];
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ctx.v2 = &vlc[1];
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ctx.recode1 = tmp1.values;
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ctx.recode2 = tmp2.values;
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ctx.last = last;
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huff.length = ((size + 3) >> 2) + 4;
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huff.maxlength = 0;
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huff.current = 0;
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huff.values = av_mallocz(huff.length * sizeof(int));
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if (!huff.values) {
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err = AVERROR(ENOMEM);
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goto error;
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}
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if (smacker_decode_bigtree(bc, &huff, &ctx) < 0)
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err = -1;
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bitstream_skip(bc, 1);
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if(ctx.last[0] == -1) ctx.last[0] = huff.current++;
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if(ctx.last[1] == -1) ctx.last[1] = huff.current++;
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if(ctx.last[2] == -1) ctx.last[2] = huff.current++;
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if (ctx.last[0] >= huff.length ||
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ctx.last[1] >= huff.length ||
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ctx.last[2] >= huff.length) {
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av_log(smk->avctx, AV_LOG_ERROR, "Huffman codes out of range\n");
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err = AVERROR_INVALIDDATA;
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}
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*recodes = huff.values;
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error:
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if(vlc[0].table)
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ff_free_vlc(&vlc[0]);
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if(vlc[1].table)
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ff_free_vlc(&vlc[1]);
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av_free(tmp1.bits);
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av_free(tmp1.lengths);
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av_free(tmp1.values);
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av_free(tmp2.bits);
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av_free(tmp2.lengths);
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av_free(tmp2.values);
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return err;
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}
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static int decode_header_trees(SmackVContext *smk) {
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BitstreamContext bc;
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int mmap_size, mclr_size, full_size, type_size;
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mmap_size = AV_RL32(smk->avctx->extradata);
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mclr_size = AV_RL32(smk->avctx->extradata + 4);
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full_size = AV_RL32(smk->avctx->extradata + 8);
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type_size = AV_RL32(smk->avctx->extradata + 12);
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bitstream_init(&bc, smk->avctx->extradata + 16, (smk->avctx->extradata_size - 16) * 8);
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if (!bitstream_read_bit(&bc)) {
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av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");
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smk->mmap_tbl = av_malloc(sizeof(int) * 2);
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if (!smk->mmap_tbl)
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return AVERROR(ENOMEM);
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smk->mmap_tbl[0] = 0;
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smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;
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} else {
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if (smacker_decode_header_tree(smk, &bc, &smk->mmap_tbl, smk->mmap_last, mmap_size))
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return -1;
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}
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if (!bitstream_read_bit(&bc)) {
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av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");
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smk->mclr_tbl = av_malloc(sizeof(int) * 2);
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if (!smk->mclr_tbl)
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return AVERROR(ENOMEM);
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smk->mclr_tbl[0] = 0;
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smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;
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} else {
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if (smacker_decode_header_tree(smk, &bc, &smk->mclr_tbl, smk->mclr_last, mclr_size))
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return -1;
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}
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if (!bitstream_read_bit(&bc)) {
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av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");
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smk->full_tbl = av_malloc(sizeof(int) * 2);
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if (!smk->full_tbl)
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return AVERROR(ENOMEM);
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smk->full_tbl[0] = 0;
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smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;
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} else {
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if (smacker_decode_header_tree(smk, &bc, &smk->full_tbl, smk->full_last, full_size))
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return -1;
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}
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if (!bitstream_read_bit(&bc)) {
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av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");
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smk->type_tbl = av_malloc(sizeof(int) * 2);
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if (!smk->type_tbl)
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return AVERROR(ENOMEM);
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smk->type_tbl[0] = 0;
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smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;
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} else {
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if (smacker_decode_header_tree(smk, &bc, &smk->type_tbl, smk->type_last, type_size))
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return -1;
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}
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return 0;
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}
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static av_always_inline void last_reset(int *recode, int *last) {
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recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;
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}
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/* get code and update history */
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static av_always_inline int smk_get_code(BitstreamContext *bc, int *recode,
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int *last)
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{
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register int *table = recode;
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int v;
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while(*table & SMK_NODE) {
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if (bitstream_read_bit(bc))
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table += (*table) & (~SMK_NODE);
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table++;
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}
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v = *table;
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if(v != recode[last[0]]) {
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recode[last[2]] = recode[last[1]];
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recode[last[1]] = recode[last[0]];
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recode[last[0]] = v;
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}
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return v;
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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SmackVContext * const smk = avctx->priv_data;
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uint8_t *out;
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uint32_t *pal;
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GetByteContext gb2;
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BitstreamContext bc;
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int blocks, blk, bw, bh;
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int i, ret;
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int stride;
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int flags;
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if (avpkt->size <= 769)
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return 0;
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if ((ret = ff_reget_buffer(avctx, smk->pic)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return ret;
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}
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/* make the palette available on the way out */
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pal = (uint32_t*)smk->pic->data[1];
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bytestream2_init(&gb2, avpkt->data, avpkt->size);
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flags = bytestream2_get_byteu(&gb2);
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smk->pic->palette_has_changed = flags & 1;
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smk->pic->key_frame = !!(flags & 2);
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if(smk->pic->key_frame)
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smk->pic->pict_type = AV_PICTURE_TYPE_I;
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else
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smk->pic->pict_type = AV_PICTURE_TYPE_P;
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for(i = 0; i < 256; i++)
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*pal++ = bytestream2_get_be24u(&gb2);
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last_reset(smk->mmap_tbl, smk->mmap_last);
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last_reset(smk->mclr_tbl, smk->mclr_last);
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last_reset(smk->full_tbl, smk->full_last);
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last_reset(smk->type_tbl, smk->type_last);
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bitstream_init(&bc, avpkt->data + 769, (avpkt->size - 769) * 8);
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blk = 0;
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bw = avctx->width >> 2;
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bh = avctx->height >> 2;
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blocks = bw * bh;
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out = smk->pic->data[0];
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stride = smk->pic->linesize[0];
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while(blk < blocks) {
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int type, run, mode;
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uint16_t pix;
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type = smk_get_code(&bc, smk->type_tbl, smk->type_last);
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run = block_runs[(type >> 2) & 0x3F];
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switch(type & 3){
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case SMK_BLK_MONO:
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while(run-- && blk < blocks){
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int clr, map;
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int hi, lo;
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clr = smk_get_code(&bc, smk->mclr_tbl, smk->mclr_last);
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map = smk_get_code(&bc, smk->mmap_tbl, smk->mmap_last);
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out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
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hi = clr >> 8;
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lo = clr & 0xFF;
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for(i = 0; i < 4; i++) {
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if(map & 1) out[0] = hi; else out[0] = lo;
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if(map & 2) out[1] = hi; else out[1] = lo;
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if(map & 4) out[2] = hi; else out[2] = lo;
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if(map & 8) out[3] = hi; else out[3] = lo;
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map >>= 4;
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out += stride;
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}
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blk++;
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}
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break;
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case SMK_BLK_FULL:
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mode = 0;
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if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes
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if (bitstream_read_bit(&bc))
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mode = 1;
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else if (bitstream_read_bit(&bc))
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mode = 2;
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}
|
|
while(run-- && blk < blocks){
|
|
out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
|
|
switch(mode){
|
|
case 0:
|
|
for(i = 0; i < 4; i++) {
|
|
pix = smk_get_code(&bc, smk->full_tbl, smk->full_last);
|
|
AV_WL16(out+2,pix);
|
|
pix = smk_get_code(&bc, smk->full_tbl, smk->full_last);
|
|
AV_WL16(out,pix);
|
|
out += stride;
|
|
}
|
|
break;
|
|
case 1:
|
|
pix = smk_get_code(&bc, smk->full_tbl, smk->full_last);
|
|
out[0] = out[1] = pix & 0xFF;
|
|
out[2] = out[3] = pix >> 8;
|
|
out += stride;
|
|
out[0] = out[1] = pix & 0xFF;
|
|
out[2] = out[3] = pix >> 8;
|
|
out += stride;
|
|
pix = smk_get_code(&bc, smk->full_tbl, smk->full_last);
|
|
out[0] = out[1] = pix & 0xFF;
|
|
out[2] = out[3] = pix >> 8;
|
|
out += stride;
|
|
out[0] = out[1] = pix & 0xFF;
|
|
out[2] = out[3] = pix >> 8;
|
|
out += stride;
|
|
break;
|
|
case 2:
|
|
for(i = 0; i < 2; i++) {
|
|
uint16_t pix1, pix2;
|
|
pix2 = smk_get_code(&bc, smk->full_tbl, smk->full_last);
|
|
pix1 = smk_get_code(&bc, smk->full_tbl, smk->full_last);
|
|
AV_WL16(out,pix1);
|
|
AV_WL16(out+2,pix2);
|
|
out += stride;
|
|
AV_WL16(out,pix1);
|
|
AV_WL16(out+2,pix2);
|
|
out += stride;
|
|
}
|
|
break;
|
|
}
|
|
blk++;
|
|
}
|
|
break;
|
|
case SMK_BLK_SKIP:
|
|
while(run-- && blk < blocks)
|
|
blk++;
|
|
break;
|
|
case SMK_BLK_FILL:
|
|
mode = type >> 8;
|
|
while(run-- && blk < blocks){
|
|
uint32_t col;
|
|
out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
|
|
col = mode * 0x01010101;
|
|
for(i = 0; i < 4; i++) {
|
|
*((uint32_t*)out) = col;
|
|
out += stride;
|
|
}
|
|
blk++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
if ((ret = av_frame_ref(data, smk->pic)) < 0)
|
|
return ret;
|
|
|
|
*got_frame = 1;
|
|
|
|
/* always report that the buffer was completely consumed */
|
|
return avpkt->size;
|
|
}
|
|
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
SmackVContext * const smk = avctx->priv_data;
|
|
|
|
av_freep(&smk->mmap_tbl);
|
|
av_freep(&smk->mclr_tbl);
|
|
av_freep(&smk->full_tbl);
|
|
av_freep(&smk->type_tbl);
|
|
|
|
av_frame_free(&smk->pic);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
SmackVContext * const c = avctx->priv_data;
|
|
|
|
c->avctx = avctx;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_PAL8;
|
|
|
|
c->pic = av_frame_alloc();
|
|
if (!c->pic)
|
|
return AVERROR(ENOMEM);
|
|
|
|
/* decode huffman trees from extradata */
|
|
if(avctx->extradata_size < 16){
|
|
av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
|
|
return -1;
|
|
}
|
|
|
|
if (decode_header_trees(c)) {
|
|
decode_end(avctx);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
static av_cold int smka_decode_init(AVCodecContext *avctx)
|
|
{
|
|
if (avctx->channels < 1 || avctx->channels > 2) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
|
|
avctx->sample_fmt = avctx->bits_per_coded_sample == 8 ? AV_SAMPLE_FMT_U8 : AV_SAMPLE_FMT_S16;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode Smacker audio data
|
|
*/
|
|
static int smka_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
|
{
|
|
AVFrame *frame = data;
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
BitstreamContext bc;
|
|
HuffContext h[4] = { { 0 } };
|
|
VLC vlc[4] = { { 0 } };
|
|
int16_t *samples;
|
|
uint8_t *samples8;
|
|
int val;
|
|
int i, res, ret;
|
|
int unp_size;
|
|
int bits, stereo;
|
|
int pred[2] = {0, 0};
|
|
|
|
if (buf_size <= 4) {
|
|
av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
unp_size = AV_RL32(buf);
|
|
|
|
bitstream_init(&bc, buf + 4, (buf_size - 4) * 8);
|
|
|
|
if (!bitstream_read_bit(&bc)) {
|
|
av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
|
|
*got_frame_ptr = 0;
|
|
return 1;
|
|
}
|
|
stereo = bitstream_read_bit(&bc);
|
|
bits = bitstream_read_bit(&bc);
|
|
if (stereo ^ (avctx->channels != 1)) {
|
|
av_log(avctx, AV_LOG_ERROR, "channels mismatch\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
if (bits && avctx->sample_fmt == AV_SAMPLE_FMT_U8) {
|
|
av_log(avctx, AV_LOG_ERROR, "sample format mismatch\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
/* get output buffer */
|
|
frame->nb_samples = unp_size / (avctx->channels * (bits + 1));
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return ret;
|
|
}
|
|
samples = (int16_t *)frame->data[0];
|
|
samples8 = frame->data[0];
|
|
|
|
// Initialize
|
|
for(i = 0; i < (1 << (bits + stereo)); i++) {
|
|
h[i].length = 256;
|
|
h[i].maxlength = 0;
|
|
h[i].current = 0;
|
|
h[i].bits = av_mallocz(256 * 4);
|
|
h[i].lengths = av_mallocz(256 * sizeof(int));
|
|
h[i].values = av_mallocz(256 * sizeof(int));
|
|
if (!h[i].bits || !h[i].lengths || !h[i].values) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto error;
|
|
}
|
|
bitstream_skip(&bc, 1);
|
|
if (smacker_decode_tree(&bc, &h[i], 0, 0) < 0) {
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto error;
|
|
}
|
|
bitstream_skip(&bc, 1);
|
|
if(h[i].current > 1) {
|
|
res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
|
|
h[i].lengths, sizeof(int), sizeof(int),
|
|
h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
|
|
if(res < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto error;
|
|
}
|
|
}
|
|
}
|
|
/* this codec relies on wraparound instead of clipping audio */
|
|
if(bits) { //decode 16-bit data
|
|
for(i = stereo; i >= 0; i--)
|
|
pred[i] = sign_extend(av_bswap16(bitstream_read(&bc, 16)), 16);
|
|
for(i = 0; i <= stereo; i++)
|
|
*samples++ = pred[i];
|
|
for(; i < unp_size / 2; i++) {
|
|
if(i & stereo) {
|
|
if(vlc[2].table)
|
|
res = bitstream_read_vlc(&bc, vlc[2].table, SMKTREE_BITS, 3);
|
|
else
|
|
res = 0;
|
|
val = h[2].values[res];
|
|
if(vlc[3].table)
|
|
res = bitstream_read_vlc(&bc, vlc[3].table, SMKTREE_BITS, 3);
|
|
else
|
|
res = 0;
|
|
val |= h[3].values[res] << 8;
|
|
pred[1] += sign_extend(val, 16);
|
|
*samples++ = pred[1];
|
|
} else {
|
|
if(vlc[0].table)
|
|
res = bitstream_read_vlc(&bc, vlc[0].table, SMKTREE_BITS, 3);
|
|
else
|
|
res = 0;
|
|
val = h[0].values[res];
|
|
if(vlc[1].table)
|
|
res = bitstream_read_vlc(&bc, vlc[1].table, SMKTREE_BITS, 3);
|
|
else
|
|
res = 0;
|
|
val |= h[1].values[res] << 8;
|
|
pred[0] += sign_extend(val, 16);
|
|
*samples++ = pred[0];
|
|
}
|
|
}
|
|
} else { //8-bit data
|
|
for(i = stereo; i >= 0; i--)
|
|
pred[i] = bitstream_read(&bc, 8);
|
|
for(i = 0; i <= stereo; i++)
|
|
*samples8++ = pred[i];
|
|
for(; i < unp_size; i++) {
|
|
if(i & stereo){
|
|
if(vlc[1].table)
|
|
res = bitstream_read_vlc(&bc, vlc[1].table, SMKTREE_BITS, 3);
|
|
else
|
|
res = 0;
|
|
pred[1] += sign_extend(h[1].values[res], 8);
|
|
*samples8++ = pred[1];
|
|
} else {
|
|
if(vlc[0].table)
|
|
res = bitstream_read_vlc(&bc, vlc[0].table, SMKTREE_BITS, 3);
|
|
else
|
|
res = 0;
|
|
pred[0] += sign_extend(h[0].values[res], 8);
|
|
*samples8++ = pred[0];
|
|
}
|
|
}
|
|
}
|
|
|
|
*got_frame_ptr = 1;
|
|
ret = buf_size;
|
|
|
|
error:
|
|
for(i = 0; i < 4; i++) {
|
|
if(vlc[i].table)
|
|
ff_free_vlc(&vlc[i]);
|
|
av_free(h[i].bits);
|
|
av_free(h[i].lengths);
|
|
av_free(h[i].values);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
AVCodec ff_smacker_decoder = {
|
|
.name = "smackvid",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Smacker video"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_SMACKVIDEO,
|
|
.priv_data_size = sizeof(SmackVContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
.decode = decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|
|
|
|
AVCodec ff_smackaud_decoder = {
|
|
.name = "smackaud",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Smacker audio"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_SMACKAUDIO,
|
|
.init = smka_decode_init,
|
|
.decode = smka_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|