Smacker demuxer and decoder.

Originally committed as revision 5189 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 689 insertions, 0 deletions

diff --git a/libavcodec/smacker.c b/libavcodec/smacker.c
new file mode 100644
index 0000000000..8842b5e5f2
--- /dev/null
+++ b/libavcodec/smacker.c
@@ -0,0 +1,689 @@
+/*
+ * Smacker decoder
+ * Copyright (c) 2006 Konstantin Shishkov
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+/**
+ * @file smacker.c
+ * Smacker decoder
+ */
+
+/*
+ * Based on http://wiki.multimedia.cx/index.php?title=Smacker
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "common.h"
+#include "avcodec.h"
+
+#define ALT_BITSTREAM_READER_LE
+#include "bitstream.h"
+
+#define SMKTREE_BITS 9
+#define SMK_NODE 0x80000000
+
+/*
+ * Decoder context
+ */
+typedef struct SmackVContext {
+    AVCodecContext *avctx;
+    AVFrame pic;
+
+    int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;
+    int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
+} SmackVContext;
+
+/**
+ * Context used for code reconstructing
+ */
+typedef struct HuffContext {
+    int length;
+    int maxlength;
+    int current;
+    uint32_t *bits;
+    int *lengths;
+    int *values;
+} HuffContext;
+
+/* common parameters used for decode_bigtree */
+typedef struct DBCtx {
+    VLC *v1, *v2;
+    int *recode1, *recode2;
+    int escapes[3];
+    int *last;
+    int lcur;
+} DBCtx;
+
+/* possible runs of blocks */
+static const int block_runs[64] = {
+      1,    2,    3,    4,    5,    6,    7,    8,
+      9,   10,   11,   12,   13,   14,   15,   16,
+     17,   18,   19,   20,   21,   22,   23,   24,
+     25,   26,   27,   28,   29,   30,   31,   32,
+     33,   34,   35,   36,   37,   38,   39,   40,
+     41,   42,   43,   44,   45,   46,   47,   48,
+     49,   50,   51,   52,   53,   54,   55,   56,
+     57,   58,   59,  128,  256,  512, 1024, 2048 };
+
+enum SmkBlockTypes {
+    SMK_BLK_MONO = 0,
+    SMK_BLK_FULL = 1,
+    SMK_BLK_SKIP = 2,
+    SMK_BLK_FILL = 3 };
+
+/**
+ * Decode local frame tree
+ */
+static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
+{
+    if(!get_bits1(gb)){ //Leaf
+        if(hc->current >= 256){
+            av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
+            return -1;
+        }
+        if(length){
+            hc->bits[hc->current] = prefix;
+            hc->lengths[hc->current] = length;
+        } else {
+            hc->bits[hc->current] = 0;
+            hc->lengths[hc->current] = 0;
+        }
+        hc->values[hc->current] = get_bits(gb, 8);
+        hc->current++;
+        if(hc->maxlength < length)
+            hc->maxlength = length;
+        return 0;
+    } else { //Node
+        int r;
+        length++;
+        r = smacker_decode_tree(gb, hc, prefix, length);
+        if(r)
+            return r;
+        return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length);
+    }
+}
+
+/**
+ * Decode header tree
+ */
+static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx)
+{
+    if(!get_bits1(gb)){ //Leaf
+        int val, i1, i2, b1, b2;
+        if(hc->current >= hc->length){
+            av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
+            return -1;
+        }
+        b1 = get_bits_count(gb);
+        i1 = get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3);
+        b1 = get_bits_count(gb) - b1;
+        b2 = get_bits_count(gb);
+        i2 = get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3);
+        b2 = get_bits_count(gb) - b2;
+        val = ctx->recode1[i1] | (ctx->recode2[i2] << 8);
+        if(val == ctx->escapes[0]) {
+            ctx->last[0] = hc->current;
+            val = 0;
+        } else if(val == ctx->escapes[1]) {
+            ctx->last[1] = hc->current;
+            val = 0;
+        } else if(val == ctx->escapes[2]) {
+            ctx->last[2] = hc->current;
+            val = 0;
+        }
+
+        hc->values[hc->current++] = val;
+        return 1;
+    } else { //Node
+        int r = 0, t;
+
+        t = hc->current++;
+        r = smacker_decode_bigtree(gb, hc, ctx);
+        if(r < 0)
+            return r;
+        hc->values[t] = SMK_NODE | r;
+        r++;
+        r += smacker_decode_bigtree(gb, hc, ctx);
+        return r;
+    }
+}
+
+/**
+ * Store large tree as FFmpeg's vlc codes
+ */
+static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
+{
+    int res;
+    HuffContext huff;
+    HuffContext tmp1, tmp2;
+    VLC vlc[2];
+    int escapes[3];
+    DBCtx ctx;
+
+    tmp1.length = 256;
+    tmp1.maxlength = 0;
+    tmp1.current = 0;
+    tmp1.bits = av_mallocz(256 * 4);
+    tmp1.lengths = av_mallocz(256 * sizeof(int));
+    tmp1.values = av_mallocz(256 * sizeof(int));
+
+    tmp2.length = 256;
+    tmp2.maxlength = 0;
+    tmp2.current = 0;
+    tmp2.bits = av_mallocz(256 * 4);
+    tmp2.lengths = av_mallocz(256 * sizeof(int));
+    tmp2.values = av_mallocz(256 * sizeof(int));
+
+    memset(&vlc[0], 0, sizeof(VLC));
+    memset(&vlc[1], 0, sizeof(VLC));
+
+    if(get_bits1(gb)) {
+        smacker_decode_tree(gb, &tmp1, 0, 0);
+        get_bits1(gb);
+        res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length,
+                    tmp1.lengths, sizeof(int), sizeof(int),
+                    tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
+        if(res < 0) {
+            av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
+            return -1;
+        }
+    } else {
+        av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n");
+    }
+    if(get_bits1(gb)){
+        smacker_decode_tree(gb, &tmp2, 0, 0);
+        get_bits1(gb);
+        res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length,
+                    tmp2.lengths, sizeof(int), sizeof(int),
+                    tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
+        if(res < 0) {
+            av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
+            return -1;
+        }
+    } else {
+        av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n");
+    }
+
+    escapes[0]  = get_bits(gb, 8);
+    escapes[0] |= get_bits(gb, 8) << 8;
+    escapes[1]  = get_bits(gb, 8);
+    escapes[1] |= get_bits(gb, 8) << 8;
+    escapes[2]  = get_bits(gb, 8);
+    escapes[2] |= get_bits(gb, 8) << 8;
+
+    last[0] = last[1] = last[2] = -1;
+
+    ctx.escapes[0] = escapes[0];
+    ctx.escapes[1] = escapes[1];
+    ctx.escapes[2] = escapes[2];
+    ctx.v1 = &vlc[0];
+    ctx.v2 = &vlc[1];
+    ctx.recode1 = tmp1.values;
+    ctx.recode2 = tmp2.values;
+    ctx.last = last;
+
+    huff.length = ((size + 3) >> 2) + 3;
+    huff.maxlength = 0;
+    huff.current = 0;
+    huff.values = av_mallocz(huff.length * sizeof(int));
+
+    smacker_decode_bigtree(gb, &huff, &ctx);
+    get_bits1(gb);
+    if(ctx.last[0] == -1) ctx.last[0] = huff.current++;
+    if(ctx.last[1] == -1) ctx.last[1] = huff.current++;
+    if(ctx.last[2] == -1) ctx.last[2] = huff.current++;
+
+    *recodes = huff.values;
+
+    if(vlc[0].table)
+        free_vlc(&vlc[0]);
+    if(vlc[1].table)
+        free_vlc(&vlc[1]);
+    av_free(tmp1.bits);
+    av_free(tmp1.lengths);
+    av_free(tmp1.values);
+    av_free(tmp2.bits);
+    av_free(tmp2.lengths);
+    av_free(tmp2.values);
+
+    return 0;
+}
+
+static int decode_header_trees(SmackVContext *smk) {
+    GetBitContext gb;
+    int mmap_size, mclr_size, full_size, type_size;
+
+    mmap_size = LE_32(smk->avctx->extradata);
+    mclr_size = LE_32(smk->avctx->extradata + 4);
+    full_size = LE_32(smk->avctx->extradata + 8);
+    type_size = LE_32(smk->avctx->extradata + 12);
+
+    init_get_bits(&gb, smk->avctx->extradata + 16, (smk->avctx->extradata_size - 16) * 8);
+
+    if(!get_bits1(&gb)) {
+        av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");
+        smk->mmap_tbl = av_malloc(sizeof(int) * 2);
+        smk->mmap_tbl[0] = 0;
+        smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;
+    } else {
+        smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size);
+    }
+    if(!get_bits(&gb, 1)) {
+        av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");
+        smk->mclr_tbl = av_malloc(sizeof(int) * 2);
+        smk->mclr_tbl[0] = 0;
+        smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;
+    } else {
+        smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size);
+    }
+    if(!get_bits(&gb, 1)) {
+        av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");
+        smk->full_tbl = av_malloc(sizeof(int) * 2);
+        smk->full_tbl[0] = 0;
+        smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;
+    } else {
+        smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size);
+    }
+    if(!get_bits(&gb, 1)) {
+        av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");
+        smk->type_tbl = av_malloc(sizeof(int) * 2);
+        smk->type_tbl[0] = 0;
+        smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;
+    } else {
+        smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size);
+    }
+
+    return 0;
+}
+
+static always_inline void last_reset(int *recode, int *last) {
+    recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;
+}
+
+/* get code and update history */
+static always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
+    register int *table = recode;
+    int v, b;
+
+    b = get_bits_count(gb);
+    while(*table & SMK_NODE) {
+        if(get_bits1(gb))
+            table += (*table) & (~SMK_NODE);
+        table++;
+    }
+    v = *table;
+    b = get_bits_count(gb) - b;
+
+    if(v != recode[last[0]]) {
+        recode[last[2]] = recode[last[1]];
+        recode[last[1]] = recode[last[0]];
+        recode[last[0]] = v;
+    }
+    return v;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
+{
+    SmackVContext * const smk = (SmackVContext *)avctx->priv_data;
+    uint8_t *out;
+    uint32_t *pal;
+    GetBitContext gb;
+    int blocks, blk, bw, bh;
+    int i;
+    int stride;
+
+    if(buf_size == 769)
+        return 0;
+    if(smk->pic.data[0])
+            avctx->release_buffer(avctx, &smk->pic);
+
+    smk->pic.reference = 1;
+    smk->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
+    if(avctx->reget_buffer(avctx, &smk->pic) < 0){
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+
+    /* make the palette available on the way out */
+    out = buf + 1;
+    pal = (uint32_t*)smk->pic.data[1];
+    smk->pic.palette_has_changed = buf[0] & 1;
+    smk->pic.key_frame = !!(buf[0] & 2);
+    if(smk->pic.key_frame)
+        smk->pic.pict_type = FF_I_TYPE;
+    else
+        smk->pic.pict_type = FF_P_TYPE;
+
+    for(i = 0; i < 256; i++) {
+        int r, g, b;
+        r = *out++;
+        g = *out++;
+        b = *out++;
+        *pal++ = (r << 16) | (g << 8) | b;
+    }
+
+    last_reset(smk->mmap_tbl, smk->mmap_last);
+    last_reset(smk->mclr_tbl, smk->mclr_last);
+    last_reset(smk->full_tbl, smk->full_last);
+    last_reset(smk->type_tbl, smk->type_last);
+    init_get_bits(&gb, buf + 769, (buf_size - 769) * 8);
+
+    blk = 0;
+    bw = avctx->width >> 2;
+    bh = avctx->height >> 2;
+    blocks = bw * bh;
+    out = smk->pic.data[0];
+    stride = smk->pic.linesize[0];
+    while(blk < blocks) {
+        int type, run, mode;
+        uint16_t pix;
+
+        type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
+        run = block_runs[(type >> 2) & 0x3F];
+        switch(type & 3){
+        case SMK_BLK_MONO:
+            while(run-- && blk < blocks){
+                int clr, map;
+                int hi, lo;
+                clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
+                map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
+                out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
+                hi = clr >> 8;
+                lo = clr & 0xFF;
+                for(i = 0; i < 4; i++) {
+                    if(map & 1) out[0] = hi; else out[0] = lo;
+                    if(map & 2) out[1] = hi; else out[1] = lo;
+                    if(map & 4) out[2] = hi; else out[2] = lo;
+                    if(map & 8) out[3] = hi; else out[3] = lo;
+                    map >>= 4;
+                    out += stride;
+                }
+                blk++;
+            }
+            break;
+        case SMK_BLK_FULL:
+            mode = 0;
+            if(avctx->codec_tag != 0) { // In case of Smacker v4 we have three modes
+                if(get_bits1(&gb)) mode = 1;
+                else if(get_bits1(&gb)) mode = 2;
+            }
+            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(&gb, smk->full_tbl, smk->full_last);
+                        out[2] = pix & 0xFF;
+                        out[3] = pix >> 8;
+                        pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
+                        out[0] = pix & 0xFF;
+                        out[1] = pix >> 8;
+                        out += stride;
+                    }
+                    break;
+                case 1:
+                    pix = smk_get_code(&gb, 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(&gb, 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;
+                        pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
+                        pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
+                        out[0] = pix1 & 0xFF; out[1] = pix1 >> 8;
+                        out[2] = pix2 & 0xFF; out[3] = pix2 >> 8;
+                        out += stride;
+                        out[0] = pix1 & 0xFF; out[1] = pix1 >> 8;
+                        out[2] = pix2 & 0xFF; out[3] = pix2 >> 8;
+                        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;
+        }
+
+    }
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = smk->pic;
+
+    /* always report that the buffer was completely consumed */
+    return buf_size;
+}
+
+
+
+/*
+ *
+ * Init smacker decoder
+ *
+ */
+static int decode_init(AVCodecContext *avctx)
+{
+    SmackVContext * const c = (SmackVContext *)avctx->priv_data;
+
+    c->avctx = avctx;
+    avctx->has_b_frames = 0;
+
+    c->pic.data[0] = NULL;
+
+    if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
+        return 1;
+    }
+
+    avctx->pix_fmt = PIX_FMT_PAL8;
+
+
+    /* decode huffman trees from extradata */
+    if(avctx->extradata_size < 16){
+        av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
+        return -1;
+    }
+
+    decode_header_trees(c);
+
+
+    return 0;
+}
+
+
+
+/*
+ *
+ * Uninit smacker decoder
+ *
+ */
+static int decode_end(AVCodecContext *avctx)
+{
+    SmackVContext * const smk = (SmackVContext *)avctx->priv_data;
+
+    if(smk->mmap_tbl)
+        av_free(smk->mmap_tbl);
+    if(smk->mclr_tbl)
+        av_free(smk->mclr_tbl);
+    if(smk->full_tbl)
+        av_free(smk->full_tbl);
+    if(smk->type_tbl)
+        av_free(smk->type_tbl);
+
+    if (smk->pic.data[0])
+        avctx->release_buffer(avctx, &smk->pic);
+
+    return 0;
+}
+
+
+static int smka_decode_init(AVCodecContext *avctx)
+{
+    return 0;
+}
+
+/**
+ * Decode Smacker audio data
+ */
+static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
+{
+    GetBitContext gb;
+    HuffContext h[4];
+    VLC vlc[4];
+    int16_t *samples = data;
+    int val;
+    int i, res;
+    int unp_size;
+    int bits, stereo;
+    int pred[2] = {0, 0};
+
+    unp_size = LE_32(buf);
+
+    init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
+
+    if(!get_bits1(&gb)){
+        av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
+        *data_size = 0;
+        return 1;
+    }
+    stereo = get_bits1(&gb);
+    bits = get_bits1(&gb);
+
+    memset(vlc, 0, sizeof(VLC) * 4);
+    memset(h, 0, sizeof(HuffContext) * 4);
+    // 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));
+        get_bits1(&gb);
+        smacker_decode_tree(&gb, &h[i], 0, 0);
+        get_bits1(&gb);
+        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");
+            return -1;
+        }
+    }
+    if(bits) { //decode 16-bit data
+        pred[0]  = get_bits(&gb, 8);
+        pred[0] |= get_bits(&gb, 8);
+        if(stereo) {
+            pred[1]  = get_bits(&gb, 8);
+            pred[1] |= get_bits(&gb, 8);
+        }
+        for(i = 0; i < unp_size / 2; i++) {
+            if(i & stereo) {
+                val  = h[2].values[get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3)];
+                val |= (int8_t)h[3].values[get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3)] << 8;
+                pred[1] += val;
+                *samples++ = pred[1];
+            } else {
+                val  = h[0].values[get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3)];
+                val |= (int8_t)h[1].values[get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3)] << 8;
+                pred[0] += val;
+                *samples++ = pred[0];
+            }
+        }
+    } else { //8-bit data
+        pred[0] = get_bits(&gb, 8);
+        if(stereo)
+            pred[1] = get_bits(&gb, 8);
+        for(i = 0; i < unp_size; i++) {
+            if(i & stereo){
+                pred[1] += (int8_t)h[1].values[get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3)];
+                *samples++ = (pred[1] - 0x80) << 8;
+            } else {
+                pred[0] += (int8_t)h[0].values[get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3)];
+                *samples++ = (pred[0] - 0x80) << 8;
+            }
+        }
+        unp_size *= 2;
+    }
+
+    for(i = 0; i < 4; i++) {
+        if(vlc[i].table)
+            free_vlc(&vlc[i]);
+        if(h[i].bits)
+            av_free(h[i].bits);
+        if(h[i].lengths)
+            av_free(h[i].lengths);
+        if(h[i].values)
+            av_free(h[i].values);
+    }
+
+    *data_size = unp_size;
+    return buf_size;
+}
+
+AVCodec smacker_decoder = {
+    "smackvid",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_SMACKVIDEO,
+    sizeof(SmackVContext),
+    decode_init,
+    NULL,
+    decode_end,
+    decode_frame
+};
+
+AVCodec smackaud_decoder = {
+    "smackaud",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_SMACKAUDIO,
+    0,
+    smka_decode_init,
+    NULL,
+    NULL,
+    smka_decode_frame
+};
+