--- /dev/null
+/*
+ * 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
+};
+
--- /dev/null
+/*
+ * 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
+ */
+
+/*
+ * Based on http://wiki.multimedia.cx/index.php?title=Smacker
+ */
+
+#include "avformat.h"
+#include "avi.h"
+#include "bswap.h"
+
+#define SMACKER_PAL 0x01
+
+enum SAudFlags {
+ SMK_AUD_PACKED = 0x80000000,
+ SMK_AUD_16BITS = 0x20000000,
+ SMK_AUD_STEREO = 0x10000000,
+ SMK_AUD_BINKAUD = 0x08000000,
+ SMK_AUD_USEDCT = 0x04000000
+};
+
+typedef struct SmackerContext {
+ /* Smacker file header */
+ uint32_t magic;
+ uint32_t width, height;
+ uint32_t frames;
+ int pts_inc;
+ uint32_t flags;
+ uint32_t audio[7];
+ uint32_t treesize;
+ uint32_t mmap_size, mclr_size, full_size, type_size;
+ uint32_t rates[7];
+ uint32_t pad;
+ /* frame info */
+ uint32_t *frm_size;
+ uint8_t *frm_flags;
+ /* internal variables */
+ int cur_frame;
+ int is_ver4;
+ int64_t cur_pts;
+ /* current frame for demuxing */
+ uint8_t pal[768];
+ int indexes[7];
+ int videoindex;
+ uint8_t *bufs[7];
+ int buf_sizes[7];
+ int stream_id[7];
+ int curstream;
+ offset_t nextpos;
+} SmackerContext;
+
+typedef struct SmackerFrame {
+ int64_t pts;
+ int stream;
+} SmackerFrame;
+
+/* palette used in Smacker */
+static const uint8_t smk_pal[64] = {
+ 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
+ 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
+ 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
+ 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
+ 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
+ 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
+ 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
+ 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
+};
+
+
+static int smacker_probe(AVProbeData *p)
+{
+ if (p->buf_size < 4)
+ return 0;
+ if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K'
+ && (p->buf[3] == '2' || p->buf[3] == '4'))
+ return AVPROBE_SCORE_MAX;
+ else
+ return 0;
+}
+
+static int smacker_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+ ByteIOContext *pb = &s->pb;
+ SmackerContext *smk = (SmackerContext *)s->priv_data;
+ AVStream *st, *ast[7];
+ int i, ret;
+ int tbase;
+
+ /* read and check header */
+ smk->magic = get_le32(pb);
+ if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
+ return -1;
+ smk->width = get_le32(pb);
+ smk->height = get_le32(pb);
+ smk->frames = get_le32(pb);
+ smk->pts_inc = (int32_t)get_le32(pb);
+ smk->flags = get_le32(pb);
+ for(i = 0; i < 7; i++)
+ smk->audio[i] = get_le32(pb);
+ smk->treesize = get_le32(pb);
+ smk->mmap_size = get_le32(pb);
+ smk->mclr_size = get_le32(pb);
+ smk->full_size = get_le32(pb);
+ smk->type_size = get_le32(pb);
+ for(i = 0; i < 7; i++)
+ smk->rates[i] = get_le32(pb);
+ smk->pad = get_le32(pb);
+ /* setup data */
+ if(smk->frames > 0xFFFFFF) {
+ av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
+ return -1;
+ }
+ smk->frm_size = av_malloc(smk->frames * 4);
+ smk->frm_flags = av_malloc(smk->frames);
+
+ smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
+
+ /* read frame info */
+ for(i = 0; i < smk->frames; i++) {
+ smk->frm_size[i] = get_le32(pb);
+ }
+ for(i = 0; i < smk->frames; i++) {
+ smk->frm_flags[i] = get_byte(pb);
+ }
+
+ /* init video codec */
+ st = av_new_stream(s, 0);
+ if (!st)
+ return -1;
+ smk->videoindex = st->index;
+ st->codec->width = smk->width;
+ st->codec->height = smk->height;
+ st->codec->pix_fmt = PIX_FMT_PAL8;
+ st->codec->codec_type = CODEC_TYPE_VIDEO;
+ st->codec->codec_id = CODEC_ID_SMACKVIDEO;
+ st->codec->codec_tag = smk->is_ver4;
+ /* Smacker uses 100000 as internal timebase */
+ if(smk->pts_inc < 0)
+ smk->pts_inc = -smk->pts_inc;
+ else
+ smk->pts_inc *= 100;
+ tbase = 100000;
+ av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
+ av_set_pts_info(st, 33, smk->pts_inc, tbase);
+ /* handle possible audio streams */
+ for(i = 0; i < 7; i++) {
+ smk->indexes[i] = -1;
+ if((smk->rates[i] & 0xFFFFFF) && !(smk->rates[i] & SMK_AUD_BINKAUD)){
+ ast[i] = av_new_stream(s, 0);
+ smk->indexes[i] = ast[i]->index;
+ av_set_pts_info(ast[i], 33, smk->pts_inc, tbase);
+ ast[i]->codec->codec_type = CODEC_TYPE_AUDIO;
+ ast[i]->codec->codec_id = (smk->rates[i] & SMK_AUD_PACKED) ? CODEC_ID_SMACKAUDIO : CODEC_ID_PCM_U8;
+ ast[i]->codec->codec_tag = 0;
+ ast[i]->codec->channels = (smk->rates[i] & SMK_AUD_STEREO) ? 2 : 1;
+ ast[i]->codec->sample_rate = smk->rates[i] & 0xFFFFFF;
+ ast[i]->codec->bits_per_sample = (smk->rates[i] & SMK_AUD_16BITS) ? 16 : 8;
+ if(ast[i]->codec->bits_per_sample == 16 && ast[i]->codec->codec_id == CODEC_ID_PCM_U8)
+ ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
+ }
+ }
+
+
+ /* load trees to extradata, they will be unpacked by decoder */
+ st->codec->extradata = av_malloc(smk->treesize + 16);
+ st->codec->extradata_size = smk->treesize + 16;
+ if(!st->codec->extradata){
+ av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
+ av_free(smk->frm_size);
+ av_free(smk->frm_flags);
+ return -1;
+ }
+ ret = get_buffer(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
+ if(ret != st->codec->extradata_size - 16){
+ av_free(smk->frm_size);
+ av_free(smk->frm_flags);
+ return AVERROR_IO;
+ }
+ ((int32_t*)st->codec->extradata)[0] = le2me_32(smk->mmap_size);
+ ((int32_t*)st->codec->extradata)[1] = le2me_32(smk->mclr_size);
+ ((int32_t*)st->codec->extradata)[2] = le2me_32(smk->full_size);
+ ((int32_t*)st->codec->extradata)[3] = le2me_32(smk->type_size);
+
+ smk->curstream = -1;
+ smk->nextpos = url_ftell(pb);
+
+ return 0;
+}
+
+
+static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ SmackerContext *smk = (SmackerContext *)s->priv_data;
+ int flags;
+ int ret;
+ int i;
+ int frame_size = 0;
+ int palchange = 0;
+ int pos;
+
+ if (url_feof(&s->pb) || smk->cur_frame >= smk->frames)
+ return -EIO;
+
+ /* if we demuxed all streams, pass another frame */
+ if(smk->curstream < 0) {
+ url_fseek(&s->pb, smk->nextpos, 0);
+ frame_size = smk->frm_size[smk->cur_frame] & (~3);
+ flags = smk->frm_flags[smk->cur_frame];
+ /* handle palette change event */
+ pos = url_ftell(&s->pb);
+ if(flags & SMACKER_PAL){
+ int size, sz, t, off, j, pos;
+ uint8_t *pal = smk->pal;
+ uint8_t oldpal[768];
+
+ memcpy(oldpal, pal, 768);
+ size = get_byte(&s->pb);
+ size = size * 4 - 1;
+ frame_size -= size;
+ frame_size--;
+ sz = 0;
+ pos = url_ftell(&s->pb) + size;
+ while(sz < 256){
+ t = get_byte(&s->pb);
+ if(t & 0x80){ /* skip palette entries */
+ sz += (t & 0x7F) + 1;
+ pal += ((t & 0x7F) + 1) * 3;
+ } else if(t & 0x40){ /* copy with offset */
+ off = get_byte(&s->pb) * 3;
+ j = (t & 0x3F) + 1;
+ while(j-- && sz < 256) {
+ *pal++ = oldpal[off + 0];
+ *pal++ = oldpal[off + 1];
+ *pal++ = oldpal[off + 2];
+ sz++;
+ off += 3;
+ }
+ } else { /* new entries */
+ *pal++ = smk_pal[t];
+ *pal++ = smk_pal[get_byte(&s->pb) & 0x3F];
+ *pal++ = smk_pal[get_byte(&s->pb) & 0x3F];
+ sz++;
+ }
+ }
+ url_fseek(&s->pb, pos, 0);
+ palchange |= 1;
+ }
+ flags >>= 1;
+ smk->curstream = -1;
+ /* if audio chunks are present, put them to stack and retrieve later */
+ for(i = 0; i < 7; i++) {
+ if(flags & 1) {
+ int size;
+ size = get_le32(&s->pb) - 4;
+ frame_size -= size;
+ frame_size -= 4;
+ smk->curstream++;
+ smk->bufs[smk->curstream] = av_realloc(smk->bufs[smk->curstream], size);
+ smk->buf_sizes[smk->curstream] = size;
+ ret = get_buffer(&s->pb, smk->bufs[smk->curstream], size);
+ if(ret != size)
+ return AVERROR_IO;
+ smk->stream_id[smk->curstream] = smk->indexes[i];
+ }
+ flags >>= 1;
+ }
+ if (av_new_packet(pkt, frame_size + 768))
+ return AVERROR_NOMEM;
+ if(smk->frm_size[smk->cur_frame] & 1)
+ palchange |= 2;
+ pkt->data[0] = palchange;
+ memcpy(pkt->data + 1, smk->pal, 768);
+ ret = get_buffer(&s->pb, pkt->data + 769, frame_size);
+ if(ret != frame_size)
+ return AVERROR_IO;
+ pkt->stream_index = smk->videoindex;
+ pkt->size = ret + 769;
+ smk->cur_frame++;
+ smk->nextpos = url_ftell(&s->pb);
+ } else {
+ if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
+ return AVERROR_NOMEM;
+ memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
+ pkt->size = smk->buf_sizes[smk->curstream];
+ pkt->stream_index = smk->stream_id[smk->curstream];
+ smk->curstream--;
+ }
+
+ return 0;
+}
+
+static int smacker_read_close(AVFormatContext *s)
+{
+ SmackerContext *smk = (SmackerContext *)s->priv_data;
+ int i;
+
+ for(i = 0; i < 7; i++)
+ if(smk->bufs[i])
+ av_free(smk->bufs[i]);
+ if(smk->frm_size)
+ av_free(smk->frm_size);
+ if(smk->frm_flags)
+ av_free(smk->frm_flags);
+
+ for(i=0;i<s->nb_streams;i++) {
+ AVStream *st = s->streams[i];
+ if(st->codec->extradata)
+ av_free(st->codec->extradata);
+ }
+ return 0;
+}
+
+static AVInputFormat smacker_iformat = {
+ "smk",
+ "Smacker Video",
+ sizeof(SmackerContext),
+ smacker_probe,
+ smacker_read_header,
+ smacker_read_packet,
+ smacker_read_close,
+};
+
+int smacker_init(void)
+{
+ av_register_input_format(&smacker_iformat);
+ return 0;
+}
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