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FFmpeg/libavcodec/smacker.c

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/*
* Smacker decoder
* Copyright (c) 2006 Konstantin Shishkov
*
* This file is part of Libav.
*
* Libav 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 2.1 of the License, or (at your option) any later version.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Smacker decoder
*/
/*
* Based on http://wiki.multimedia.cx/index.php?title=Smacker
*/
#include <stdio.h>
#include <stdlib.h>
#include "libavutil/channel_layout.h"
#include "avcodec.h"
#include "internal.h"
#include "mathops.h"
#define BITSTREAM_READER_LE
#include "get_bits.h"
#include "bytestream.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 (hc->current + 1 >= hc->length) {
av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
return -1;
}
if(!get_bits1(gb)){ //Leaf
int val, i1, i2;
i1 = ctx->v1->table ? get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3) : 0;
i2 = ctx->v2->table ? get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3) : 0;
if (i1 < 0 || i2 < 0)
return -1;
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, r_new, t;
t = hc->current++;
r = smacker_decode_bigtree(gb, hc, ctx);
if(r < 0)
return r;
hc->values[t] = SMK_NODE | r;
r++;
r_new = smacker_decode_bigtree(gb, hc, ctx);
if (r_new < 0)
return r_new;
return r + r_new;
}
}
/**
* Store large tree as Libav'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] = { { 0 } };
int escapes[3];
DBCtx ctx;
int err = 0;
if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow
av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");
return -1;
}
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));
if(get_bits1(gb)) {
smacker_decode_tree(gb, &tmp1, 0, 0);
skip_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);
skip_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));
if (smacker_decode_bigtree(gb, &huff, &ctx) < 0)
err = -1;
skip_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)
ff_free_vlc(&vlc[0]);
if(vlc[1].table)
ff_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 err;
}
static int decode_header_trees(SmackVContext *smk) {
GetBitContext gb;
int mmap_size, mclr_size, full_size, type_size;
mmap_size = AV_RL32(smk->avctx->extradata);
mclr_size = AV_RL32(smk->avctx->extradata + 4);
full_size = AV_RL32(smk->avctx->extradata + 8);
type_size = AV_RL32(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 {
if (smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size))
return -1;
}
if(!get_bits1(&gb)) {
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 {
if (smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size))
return -1;
}
if(!get_bits1(&gb)) {
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 {
if (smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size))
return -1;
}
if(!get_bits1(&gb)) {
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 {
if (smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size))
return -1;
}
return 0;
}
static av_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 av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
register int *table = recode;
int v;
while(*table & SMK_NODE) {
if(get_bits1(gb))
table += (*table) & (~SMK_NODE);
table++;
}
v = *table;
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 *got_frame,
AVPacket *avpkt)
{
SmackVContext * const smk = avctx->priv_data;
uint8_t *out;
uint32_t *pal;
GetByteContext gb2;
GetBitContext gb;
int blocks, blk, bw, bh;
int i;
int stride;
int flags;
if (avpkt->size <= 769)
return 0;
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 */
pal = (uint32_t*)smk->pic.data[1];
bytestream2_init(&gb2, avpkt->data, avpkt->size);
flags = bytestream2_get_byteu(&gb2);
smk->pic.palette_has_changed = flags & 1;
smk->pic.key_frame = !!(flags & 2);
if(smk->pic.key_frame)
smk->pic.pict_type = AV_PICTURE_TYPE_I;
else
smk->pic.pict_type = AV_PICTURE_TYPE_P;
for(i = 0; i < 256; i++)
*pal++ = bytestream2_get_be24u(&gb2);
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, avpkt->data + 769, (avpkt->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 == MKTAG('S', 'M', 'K', '4')) { // 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);
AV_WL16(out+2,pix);
pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
AV_WL16(out,pix);
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;
pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
pix1 = smk_get_code(&gb, 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;
}
}
*got_frame = 1;
*(AVFrame*)data = smk->pic;
/* always report that the buffer was completely consumed */
return avpkt->size;
}
/*
*
* Init smacker decoder
*
*/
static av_cold int decode_init(AVCodecContext *avctx)
{
SmackVContext * const c = avctx->priv_data;
c->avctx = avctx;
avctx->pix_fmt = AV_PIX_FMT_PAL8;
/* 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))
return -1;
return 0;
}
/*
*
* Uninit smacker decoder
*
*/
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);
if (smk->pic.data[0])
avctx->release_buffer(avctx, &smk->pic);
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;
GetBitContext gb;
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);
init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
if(!get_bits1(&gb)){
av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
*got_frame_ptr = 0;
return 1;
}
stereo = get_bits1(&gb);
bits = get_bits1(&gb);
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) {
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));
skip_bits1(&gb);
smacker_decode_tree(&gb, &h[i], 0, 0);
skip_bits1(&gb);
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");
return -1;
}
}
}
if(bits) { //decode 16-bit data
for(i = stereo; i >= 0; i--)
pred[i] = sign_extend(av_bswap16(get_bits(&gb, 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 = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
else
res = 0;
val = h[2].values[res];
if(vlc[3].table)
res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);
else
res = 0;
val |= h[3].values[res] << 8;
pred[1] += sign_extend(val, 16);
*samples++ = av_clip_int16(pred[1]);
} else {
if(vlc[0].table)
res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
else
res = 0;
val = h[0].values[res];
if(vlc[1].table)
res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
else
res = 0;
val |= h[1].values[res] << 8;
pred[0] += sign_extend(val, 16);
*samples++ = av_clip_int16(pred[0]);
}
}
} else { //8-bit data
for(i = stereo; i >= 0; i--)
pred[i] = get_bits(&gb, 8);
for(i = 0; i <= stereo; i++)
*samples8++ = pred[i];
for(; i < unp_size; i++) {
if(i & stereo){
if(vlc[1].table)
res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
else
res = 0;
pred[1] += sign_extend(h[1].values[res], 8);
*samples8++ = av_clip_uint8(pred[1]);
} else {
if(vlc[0].table)
res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
else
res = 0;
pred[0] += sign_extend(h[0].values[res], 8);
*samples8++ = av_clip_uint8(pred[0]);
}
}
}
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);
}
*got_frame_ptr = 1;
return buf_size;
}
AVCodec ff_smacker_decoder = {
.name = "smackvid",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_SMACKVIDEO,
.priv_data_size = sizeof(SmackVContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Smacker video"),
};
AVCodec ff_smackaud_decoder = {
.name = "smackaud",
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_SMACKAUDIO,
.init = smka_decode_init,
.decode = smka_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Smacker audio"),
};