yading@10: /*
yading@10:  * Smacker decoder
yading@10:  * Copyright (c) 2006 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Smacker decoder
yading@10:  */
yading@10: 
yading@10: /*
yading@10:  * Based on http://wiki.multimedia.cx/index.php?title=Smacker
yading@10:  */
yading@10: 
yading@10: #include <stdio.h>
yading@10: #include <stdlib.h>
yading@10: 
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "mathops.h"
yading@10: 
yading@10: #define BITSTREAM_READER_LE
yading@10: #include "get_bits.h"
yading@10: #include "bytestream.h"
yading@10: 
yading@10: #define SMKTREE_BITS 9
yading@10: #define SMK_NODE 0x80000000
yading@10: 
yading@10: /*
yading@10:  * Decoder context
yading@10:  */
yading@10: typedef struct SmackVContext {
yading@10:     AVCodecContext *avctx;
yading@10:     AVFrame pic;
yading@10: 
yading@10:     int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;
yading@10:     int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
yading@10: } SmackVContext;
yading@10: 
yading@10: /**
yading@10:  * Context used for code reconstructing
yading@10:  */
yading@10: typedef struct HuffContext {
yading@10:     int length;
yading@10:     int maxlength;
yading@10:     int current;
yading@10:     uint32_t *bits;
yading@10:     int *lengths;
yading@10:     int *values;
yading@10: } HuffContext;
yading@10: 
yading@10: /* common parameters used for decode_bigtree */
yading@10: typedef struct DBCtx {
yading@10:     VLC *v1, *v2;
yading@10:     int *recode1, *recode2;
yading@10:     int escapes[3];
yading@10:     int *last;
yading@10:     int lcur;
yading@10: } DBCtx;
yading@10: 
yading@10: /* possible runs of blocks */
yading@10: static const int block_runs[64] = {
yading@10:       1,    2,    3,    4,    5,    6,    7,    8,
yading@10:       9,   10,   11,   12,   13,   14,   15,   16,
yading@10:      17,   18,   19,   20,   21,   22,   23,   24,
yading@10:      25,   26,   27,   28,   29,   30,   31,   32,
yading@10:      33,   34,   35,   36,   37,   38,   39,   40,
yading@10:      41,   42,   43,   44,   45,   46,   47,   48,
yading@10:      49,   50,   51,   52,   53,   54,   55,   56,
yading@10:      57,   58,   59,  128,  256,  512, 1024, 2048 };
yading@10: 
yading@10: enum SmkBlockTypes {
yading@10:     SMK_BLK_MONO = 0,
yading@10:     SMK_BLK_FULL = 1,
yading@10:     SMK_BLK_SKIP = 2,
yading@10:     SMK_BLK_FILL = 3 };
yading@10: 
yading@10: /**
yading@10:  * Decode local frame tree
yading@10:  */
yading@10: static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
yading@10: {
yading@10:     if(length > 32 || length > 3*SMKTREE_BITS) {
yading@10:         av_log(NULL, AV_LOG_ERROR, "length too long\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if(!get_bits1(gb)){ //Leaf
yading@10:         if(hc->current >= 256){
yading@10:             av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         if(length){
yading@10:             hc->bits[hc->current] = prefix;
yading@10:             hc->lengths[hc->current] = length;
yading@10:         } else {
yading@10:             hc->bits[hc->current] = 0;
yading@10:             hc->lengths[hc->current] = 0;
yading@10:         }
yading@10:         hc->values[hc->current] = get_bits(gb, 8);
yading@10:         hc->current++;
yading@10:         if(hc->maxlength < length)
yading@10:             hc->maxlength = length;
yading@10:         return 0;
yading@10:     } else { //Node
yading@10:         int r;
yading@10:         length++;
yading@10:         r = smacker_decode_tree(gb, hc, prefix, length);
yading@10:         if(r)
yading@10:             return r;
yading@10:         return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length);
yading@10:     }
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Decode header tree
yading@10:  */
yading@10: static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx)
yading@10: {
yading@10:     if (hc->current + 1 >= hc->length) {
yading@10:         av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if(!get_bits1(gb)){ //Leaf
yading@10:         int val, i1, i2;
yading@10:         i1 = ctx->v1->table ? get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3) : 0;
yading@10:         i2 = ctx->v2->table ? get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3) : 0;
yading@10:         if (i1 < 0 || i2 < 0)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         val = ctx->recode1[i1] | (ctx->recode2[i2] << 8);
yading@10:         if(val == ctx->escapes[0]) {
yading@10:             ctx->last[0] = hc->current;
yading@10:             val = 0;
yading@10:         } else if(val == ctx->escapes[1]) {
yading@10:             ctx->last[1] = hc->current;
yading@10:             val = 0;
yading@10:         } else if(val == ctx->escapes[2]) {
yading@10:             ctx->last[2] = hc->current;
yading@10:             val = 0;
yading@10:         }
yading@10: 
yading@10:         hc->values[hc->current++] = val;
yading@10:         return 1;
yading@10:     } else { //Node
yading@10:         int r = 0, r_new, t;
yading@10: 
yading@10:         t = hc->current++;
yading@10:         r = smacker_decode_bigtree(gb, hc, ctx);
yading@10:         if(r < 0)
yading@10:             return r;
yading@10:         hc->values[t] = SMK_NODE | r;
yading@10:         r++;
yading@10:         r_new = smacker_decode_bigtree(gb, hc, ctx);
yading@10:         if (r_new < 0)
yading@10:             return r_new;
yading@10:         return r + r_new;
yading@10:     }
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Store large tree as FFmpeg's vlc codes
yading@10:  */
yading@10: static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
yading@10: {
yading@10:     int res;
yading@10:     HuffContext huff;
yading@10:     HuffContext tmp1, tmp2;
yading@10:     VLC vlc[2] = { { 0 } };
yading@10:     int escapes[3];
yading@10:     DBCtx ctx;
yading@10:     int err = 0;
yading@10: 
yading@10:     if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow
yading@10:         av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     tmp1.length = 256;
yading@10:     tmp1.maxlength = 0;
yading@10:     tmp1.current = 0;
yading@10:     tmp1.bits = av_mallocz(256 * 4);
yading@10:     tmp1.lengths = av_mallocz(256 * sizeof(int));
yading@10:     tmp1.values = av_mallocz(256 * sizeof(int));
yading@10: 
yading@10:     tmp2.length = 256;
yading@10:     tmp2.maxlength = 0;
yading@10:     tmp2.current = 0;
yading@10:     tmp2.bits = av_mallocz(256 * 4);
yading@10:     tmp2.lengths = av_mallocz(256 * sizeof(int));
yading@10:     tmp2.values = av_mallocz(256 * sizeof(int));
yading@10: 
yading@10:     if(get_bits1(gb)) {
yading@10:         res = smacker_decode_tree(gb, &tmp1, 0, 0);
yading@10:         if (res < 0)
yading@10:             return res;
yading@10:         skip_bits1(gb);
yading@10:         if(tmp1.current > 1) {
yading@10:             res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length,
yading@10:                         tmp1.lengths, sizeof(int), sizeof(int),
yading@10:                         tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
yading@10:             if(res < 0) {
yading@10:                 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10:     if (!vlc[0].table) {
yading@10:         av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n");
yading@10:     }
yading@10:     if(get_bits1(gb)){
yading@10:         res = smacker_decode_tree(gb, &tmp2, 0, 0);
yading@10:         if (res < 0)
yading@10:             return res;
yading@10:         skip_bits1(gb);
yading@10:         if(tmp2.current > 1) {
yading@10:             res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length,
yading@10:                         tmp2.lengths, sizeof(int), sizeof(int),
yading@10:                         tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
yading@10:             if(res < 0) {
yading@10:                 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10:     if (!vlc[1].table) {
yading@10:         av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n");
yading@10:     }
yading@10: 
yading@10:     escapes[0]  = get_bits(gb, 16);
yading@10:     escapes[1]  = get_bits(gb, 16);
yading@10:     escapes[2]  = get_bits(gb, 16);
yading@10: 
yading@10:     last[0] = last[1] = last[2] = -1;
yading@10: 
yading@10:     ctx.escapes[0] = escapes[0];
yading@10:     ctx.escapes[1] = escapes[1];
yading@10:     ctx.escapes[2] = escapes[2];
yading@10:     ctx.v1 = &vlc[0];
yading@10:     ctx.v2 = &vlc[1];
yading@10:     ctx.recode1 = tmp1.values;
yading@10:     ctx.recode2 = tmp2.values;
yading@10:     ctx.last = last;
yading@10: 
yading@10:     huff.length = ((size + 3) >> 2) + 3;
yading@10:     huff.maxlength = 0;
yading@10:     huff.current = 0;
yading@10:     huff.values = av_mallocz(huff.length * sizeof(int));
yading@10: 
yading@10:     if (smacker_decode_bigtree(gb, &huff, &ctx) < 0)
yading@10:         err = -1;
yading@10:     skip_bits1(gb);
yading@10:     if(ctx.last[0] == -1) ctx.last[0] = huff.current++;
yading@10:     if(ctx.last[1] == -1) ctx.last[1] = huff.current++;
yading@10:     if(ctx.last[2] == -1) ctx.last[2] = huff.current++;
yading@10:     if(huff.current > huff.length){
yading@10:         ctx.last[0] = ctx.last[1] = ctx.last[2] = 1;
yading@10:         av_log(smk->avctx, AV_LOG_ERROR, "bigtree damaged\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     *recodes = huff.values;
yading@10: 
yading@10:     if(vlc[0].table)
yading@10:         ff_free_vlc(&vlc[0]);
yading@10:     if(vlc[1].table)
yading@10:         ff_free_vlc(&vlc[1]);
yading@10:     av_free(tmp1.bits);
yading@10:     av_free(tmp1.lengths);
yading@10:     av_free(tmp1.values);
yading@10:     av_free(tmp2.bits);
yading@10:     av_free(tmp2.lengths);
yading@10:     av_free(tmp2.values);
yading@10: 
yading@10:     return err;
yading@10: }
yading@10: 
yading@10: static int decode_header_trees(SmackVContext *smk) {
yading@10:     GetBitContext gb;
yading@10:     int mmap_size, mclr_size, full_size, type_size;
yading@10: 
yading@10:     mmap_size = AV_RL32(smk->avctx->extradata);
yading@10:     mclr_size = AV_RL32(smk->avctx->extradata + 4);
yading@10:     full_size = AV_RL32(smk->avctx->extradata + 8);
yading@10:     type_size = AV_RL32(smk->avctx->extradata + 12);
yading@10: 
yading@10:     init_get_bits(&gb, smk->avctx->extradata + 16, (smk->avctx->extradata_size - 16) * 8);
yading@10: 
yading@10:     if(!get_bits1(&gb)) {
yading@10:         av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");
yading@10:         smk->mmap_tbl = av_malloc(sizeof(int) * 2);
yading@10:         smk->mmap_tbl[0] = 0;
yading@10:         smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;
yading@10:     } else {
yading@10:         if (smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size))
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if(!get_bits1(&gb)) {
yading@10:         av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");
yading@10:         smk->mclr_tbl = av_malloc(sizeof(int) * 2);
yading@10:         smk->mclr_tbl[0] = 0;
yading@10:         smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;
yading@10:     } else {
yading@10:         if (smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size))
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if(!get_bits1(&gb)) {
yading@10:         av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");
yading@10:         smk->full_tbl = av_malloc(sizeof(int) * 2);
yading@10:         smk->full_tbl[0] = 0;
yading@10:         smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;
yading@10:     } else {
yading@10:         if (smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size))
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if(!get_bits1(&gb)) {
yading@10:         av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");
yading@10:         smk->type_tbl = av_malloc(sizeof(int) * 2);
yading@10:         smk->type_tbl[0] = 0;
yading@10:         smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;
yading@10:     } else {
yading@10:         if (smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size))
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_always_inline void last_reset(int *recode, int *last) {
yading@10:     recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;
yading@10: }
yading@10: 
yading@10: /* get code and update history */
yading@10: static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
yading@10:     register int *table = recode;
yading@10:     int v;
yading@10: 
yading@10:     while(*table & SMK_NODE) {
yading@10:         if(get_bits1(gb))
yading@10:             table += (*table) & (~SMK_NODE);
yading@10:         table++;
yading@10:     }
yading@10:     v = *table;
yading@10: 
yading@10:     if(v != recode[last[0]]) {
yading@10:         recode[last[2]] = recode[last[1]];
yading@10:         recode[last[1]] = recode[last[0]];
yading@10:         recode[last[0]] = v;
yading@10:     }
yading@10:     return v;
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     SmackVContext * const smk = avctx->priv_data;
yading@10:     uint8_t *out;
yading@10:     uint32_t *pal;
yading@10:     GetByteContext gb2;
yading@10:     GetBitContext gb;
yading@10:     int blocks, blk, bw, bh;
yading@10:     int i, ret;
yading@10:     int stride;
yading@10:     int flags;
yading@10: 
yading@10:     if (avpkt->size <= 769)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     if ((ret = ff_reget_buffer(avctx, &smk->pic)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     /* make the palette available on the way out */
yading@10:     pal = (uint32_t*)smk->pic.data[1];
yading@10:     bytestream2_init(&gb2, avpkt->data, avpkt->size);
yading@10:     flags = bytestream2_get_byteu(&gb2);
yading@10:     smk->pic.palette_has_changed = flags & 1;
yading@10:     smk->pic.key_frame = !!(flags & 2);
yading@10:     if(smk->pic.key_frame)
yading@10:         smk->pic.pict_type = AV_PICTURE_TYPE_I;
yading@10:     else
yading@10:         smk->pic.pict_type = AV_PICTURE_TYPE_P;
yading@10: 
yading@10:     for(i = 0; i < 256; i++)
yading@10:         *pal++ = 0xFFU << 24 | bytestream2_get_be24u(&gb2);
yading@10: 
yading@10:     last_reset(smk->mmap_tbl, smk->mmap_last);
yading@10:     last_reset(smk->mclr_tbl, smk->mclr_last);
yading@10:     last_reset(smk->full_tbl, smk->full_last);
yading@10:     last_reset(smk->type_tbl, smk->type_last);
yading@10:     init_get_bits(&gb, avpkt->data + 769, (avpkt->size - 769) * 8);
yading@10: 
yading@10:     blk = 0;
yading@10:     bw = avctx->width >> 2;
yading@10:     bh = avctx->height >> 2;
yading@10:     blocks = bw * bh;
yading@10:     out = smk->pic.data[0];
yading@10:     stride = smk->pic.linesize[0];
yading@10:     while(blk < blocks) {
yading@10:         int type, run, mode;
yading@10:         uint16_t pix;
yading@10: 
yading@10:         type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
yading@10:         run = block_runs[(type >> 2) & 0x3F];
yading@10:         switch(type & 3){
yading@10:         case SMK_BLK_MONO:
yading@10:             while(run-- && blk < blocks){
yading@10:                 int clr, map;
yading@10:                 int hi, lo;
yading@10:                 clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
yading@10:                 map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
yading@10:                 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
yading@10:                 hi = clr >> 8;
yading@10:                 lo = clr & 0xFF;
yading@10:                 for(i = 0; i < 4; i++) {
yading@10:                     if(map & 1) out[0] = hi; else out[0] = lo;
yading@10:                     if(map & 2) out[1] = hi; else out[1] = lo;
yading@10:                     if(map & 4) out[2] = hi; else out[2] = lo;
yading@10:                     if(map & 8) out[3] = hi; else out[3] = lo;
yading@10:                     map >>= 4;
yading@10:                     out += stride;
yading@10:                 }
yading@10:                 blk++;
yading@10:             }
yading@10:             break;
yading@10:         case SMK_BLK_FULL:
yading@10:             mode = 0;
yading@10:             if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes
yading@10:                 if(get_bits1(&gb)) mode = 1;
yading@10:                 else if(get_bits1(&gb)) mode = 2;
yading@10:             }
yading@10:             while(run-- && blk < blocks){
yading@10:                 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
yading@10:                 switch(mode){
yading@10:                 case 0:
yading@10:                     for(i = 0; i < 4; i++) {
yading@10:                         pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
yading@10:                         AV_WL16(out+2,pix);
yading@10:                         pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
yading@10:                         AV_WL16(out,pix);
yading@10:                         out += stride;
yading@10:                     }
yading@10:                     break;
yading@10:                 case 1:
yading@10:                     pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
yading@10:                     out[0] = out[1] = pix & 0xFF;
yading@10:                     out[2] = out[3] = pix >> 8;
yading@10:                     out += stride;
yading@10:                     out[0] = out[1] = pix & 0xFF;
yading@10:                     out[2] = out[3] = pix >> 8;
yading@10:                     out += stride;
yading@10:                     pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
yading@10:                     out[0] = out[1] = pix & 0xFF;
yading@10:                     out[2] = out[3] = pix >> 8;
yading@10:                     out += stride;
yading@10:                     out[0] = out[1] = pix & 0xFF;
yading@10:                     out[2] = out[3] = pix >> 8;
yading@10:                     out += stride;
yading@10:                     break;
yading@10:                 case 2:
yading@10:                     for(i = 0; i < 2; i++) {
yading@10:                         uint16_t pix1, pix2;
yading@10:                         pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
yading@10:                         pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
yading@10:                         AV_WL16(out,pix1);
yading@10:                         AV_WL16(out+2,pix2);
yading@10:                         out += stride;
yading@10:                         AV_WL16(out,pix1);
yading@10:                         AV_WL16(out+2,pix2);
yading@10:                         out += stride;
yading@10:                     }
yading@10:                     break;
yading@10:                 }
yading@10:                 blk++;
yading@10:             }
yading@10:             break;
yading@10:         case SMK_BLK_SKIP:
yading@10:             while(run-- && blk < blocks)
yading@10:                 blk++;
yading@10:             break;
yading@10:         case SMK_BLK_FILL:
yading@10:             mode = type >> 8;
yading@10:             while(run-- && blk < blocks){
yading@10:                 uint32_t col;
yading@10:                 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
yading@10:                 col = mode * 0x01010101;
yading@10:                 for(i = 0; i < 4; i++) {
yading@10:                     *((uint32_t*)out) = col;
yading@10:                     out += stride;
yading@10:                 }
yading@10:                 blk++;
yading@10:             }
yading@10:             break;
yading@10:         }
yading@10: 
yading@10:     }
yading@10: 
yading@10:     if ((ret = av_frame_ref(data, &smk->pic)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     /* always report that the buffer was completely consumed */
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: 
yading@10: 
yading@10: /*
yading@10:  *
yading@10:  * Init smacker decoder
yading@10:  *
yading@10:  */
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     SmackVContext * const c = avctx->priv_data;
yading@10: 
yading@10:     c->avctx = avctx;
yading@10: 
yading@10:     avctx->pix_fmt = AV_PIX_FMT_PAL8;
yading@10:     avcodec_get_frame_defaults(&c->pic);
yading@10: 
yading@10:     /* decode huffman trees from extradata */
yading@10:     if(avctx->extradata_size < 16){
yading@10:         av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if (decode_header_trees(c))
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: 
yading@10: 
yading@10: /*
yading@10:  *
yading@10:  * Uninit smacker decoder
yading@10:  *
yading@10:  */
yading@10: static av_cold int decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     SmackVContext * const smk = avctx->priv_data;
yading@10: 
yading@10:     av_freep(&smk->mmap_tbl);
yading@10:     av_freep(&smk->mclr_tbl);
yading@10:     av_freep(&smk->full_tbl);
yading@10:     av_freep(&smk->type_tbl);
yading@10: 
yading@10:     av_frame_unref(&smk->pic);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: 
yading@10: static av_cold int smka_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     if (avctx->channels < 1 || avctx->channels > 2) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
yading@10:     avctx->sample_fmt = avctx->bits_per_coded_sample == 8 ? AV_SAMPLE_FMT_U8 : AV_SAMPLE_FMT_S16;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Decode Smacker audio data
yading@10:  */
yading@10: static int smka_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                              int *got_frame_ptr, AVPacket *avpkt)
yading@10: {
yading@10:     AVFrame *frame     = data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size = avpkt->size;
yading@10:     GetBitContext gb;
yading@10:     HuffContext h[4] = { { 0 } };
yading@10:     VLC vlc[4]       = { { 0 } };
yading@10:     int16_t *samples;
yading@10:     uint8_t *samples8;
yading@10:     int val;
yading@10:     int i, res, ret;
yading@10:     int unp_size;
yading@10:     int bits, stereo;
yading@10:     int pred[2] = {0, 0};
yading@10: 
yading@10:     if (buf_size <= 4) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     unp_size = AV_RL32(buf);
yading@10: 
yading@10:     if (unp_size > (1U<<24)) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "packet is too big\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
yading@10: 
yading@10:     if(!get_bits1(&gb)){
yading@10:         av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
yading@10:         *got_frame_ptr = 0;
yading@10:         return 1;
yading@10:     }
yading@10:     stereo = get_bits1(&gb);
yading@10:     bits = get_bits1(&gb);
yading@10:     if (stereo ^ (avctx->channels != 1)) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "channels mismatch\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     if (bits && avctx->sample_fmt == AV_SAMPLE_FMT_U8) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "sample format mismatch\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     /* get output buffer */
yading@10:     frame->nb_samples = unp_size / (avctx->channels * (bits + 1));
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10:     samples  = (int16_t *)frame->data[0];
yading@10:     samples8 =            frame->data[0];
yading@10: 
yading@10:     // Initialize
yading@10:     for(i = 0; i < (1 << (bits + stereo)); i++) {
yading@10:         h[i].length = 256;
yading@10:         h[i].maxlength = 0;
yading@10:         h[i].current = 0;
yading@10:         h[i].bits = av_mallocz(256 * 4);
yading@10:         h[i].lengths = av_mallocz(256 * sizeof(int));
yading@10:         h[i].values = av_mallocz(256 * sizeof(int));
yading@10:         skip_bits1(&gb);
yading@10:         res = smacker_decode_tree(&gb, &h[i], 0, 0);
yading@10:         if (res < 0)
yading@10:             return res;
yading@10:         skip_bits1(&gb);
yading@10:         if(h[i].current > 1) {
yading@10:             res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
yading@10:                     h[i].lengths, sizeof(int), sizeof(int),
yading@10:                     h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
yading@10:             if(res < 0) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10:     if(bits) { //decode 16-bit data
yading@10:         for(i = stereo; i >= 0; i--)
yading@10:             pred[i] = sign_extend(av_bswap16(get_bits(&gb, 16)), 16);
yading@10:         for(i = 0; i <= stereo; i++)
yading@10:             *samples++ = pred[i];
yading@10:         for(; i < unp_size / 2; i++) {
yading@10:             if(get_bits_left(&gb)<0)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             if(i & stereo) {
yading@10:                 if(vlc[2].table)
yading@10:                     res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
yading@10:                 else
yading@10:                     res = 0;
yading@10:                 if (res < 0) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10:                 val  = h[2].values[res];
yading@10:                 if(vlc[3].table)
yading@10:                     res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);
yading@10:                 else
yading@10:                     res = 0;
yading@10:                 if (res < 0) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10:                 val |= h[3].values[res] << 8;
yading@10:                 pred[1] += sign_extend(val, 16);
yading@10:                 *samples++ = av_clip_int16(pred[1]);
yading@10:             } else {
yading@10:                 if(vlc[0].table)
yading@10:                     res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
yading@10:                 else
yading@10:                     res = 0;
yading@10:                 if (res < 0) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10:                 val  = h[0].values[res];
yading@10:                 if(vlc[1].table)
yading@10:                     res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
yading@10:                 else
yading@10:                     res = 0;
yading@10:                 if (res < 0) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10:                 val |= h[1].values[res] << 8;
yading@10:                 pred[0] += sign_extend(val, 16);
yading@10:                 *samples++ = av_clip_int16(pred[0]);
yading@10:             }
yading@10:         }
yading@10:     } else { //8-bit data
yading@10:         for(i = stereo; i >= 0; i--)
yading@10:             pred[i] = get_bits(&gb, 8);
yading@10:         for(i = 0; i <= stereo; i++)
yading@10:             *samples8++ = pred[i];
yading@10:         for(; i < unp_size; i++) {
yading@10:             if(get_bits_left(&gb)<0)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             if(i & stereo){
yading@10:                 if(vlc[1].table)
yading@10:                     res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
yading@10:                 else
yading@10:                     res = 0;
yading@10:                 if (res < 0) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10:                 pred[1] += sign_extend(h[1].values[res], 8);
yading@10:                 *samples8++ = av_clip_uint8(pred[1]);
yading@10:             } else {
yading@10:                 if(vlc[0].table)
yading@10:                     res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
yading@10:                 else
yading@10:                     res = 0;
yading@10:                 if (res < 0) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10:                 pred[0] += sign_extend(h[0].values[res], 8);
yading@10:                 *samples8++ = av_clip_uint8(pred[0]);
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     for(i = 0; i < 4; i++) {
yading@10:         if(vlc[i].table)
yading@10:             ff_free_vlc(&vlc[i]);
yading@10:         av_free(h[i].bits);
yading@10:         av_free(h[i].lengths);
yading@10:         av_free(h[i].values);
yading@10:     }
yading@10: 
yading@10:     *got_frame_ptr = 1;
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_smacker_decoder = {
yading@10:     .name           = "smackvid",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_SMACKVIDEO,
yading@10:     .priv_data_size = sizeof(SmackVContext),
yading@10:     .init           = decode_init,
yading@10:     .close          = decode_end,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Smacker video"),
yading@10: };
yading@10: 
yading@10: AVCodec ff_smackaud_decoder = {
yading@10:     .name           = "smackaud",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_SMACKAUDIO,
yading@10:     .init           = smka_decode_init,
yading@10:     .decode         = smka_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Smacker audio"),
yading@10: };