0,0 → 1,828 |
/* |
* Smacker decoder |
* Copyright (c) 2006 Konstantin Shishkov |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg 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. |
* |
* FFmpeg 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 FFmpeg; 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(length > 32 || length > 3*SMKTREE_BITS) { |
av_log(NULL, AV_LOG_ERROR, "length too long\n"); |
return AVERROR_INVALIDDATA; |
} |
if(!get_bits1(gb)){ //Leaf |
if(hc->current >= hc->length){ |
av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n"); |
return AVERROR_INVALIDDATA; |
} |
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 AVERROR_INVALIDDATA; |
} |
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 AVERROR_INVALIDDATA; |
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 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] = { { 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 AVERROR_INVALIDDATA; |
} |
|
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 (!tmp1.bits || !tmp1.lengths || !tmp1.values || |
!tmp2.bits || !tmp2.lengths || !tmp2.values) { |
err = AVERROR(ENOMEM); |
goto error; |
} |
|
if(get_bits1(gb)) { |
res = smacker_decode_tree(gb, &tmp1, 0, 0); |
if (res < 0) { |
err = res; |
goto error; |
} |
skip_bits1(gb); |
if(tmp1.current > 1) { |
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"); |
err = res; |
goto error; |
} |
} |
} |
if (!vlc[0].table) { |
av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n"); |
} |
if(get_bits1(gb)){ |
res = smacker_decode_tree(gb, &tmp2, 0, 0); |
if (res < 0) { |
err = res; |
goto error; |
} |
skip_bits1(gb); |
if(tmp2.current > 1) { |
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"); |
err = res; |
goto error; |
} |
} |
} |
if (!vlc[1].table) { |
av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n"); |
} |
|
escapes[0] = get_bits(gb, 16); |
escapes[1] = get_bits(gb, 16); |
escapes[2] = get_bits(gb, 16); |
|
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) + 4; |
huff.maxlength = 0; |
huff.current = 0; |
huff.values = av_mallocz(huff.length * sizeof(int)); |
if (!huff.values) { |
err = AVERROR(ENOMEM); |
goto error; |
} |
|
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++; |
if (ctx.last[0] >= huff.length || |
ctx.last[1] >= huff.length || |
ctx.last[2] >= huff.length) { |
av_log(smk->avctx, AV_LOG_ERROR, "Huffman codes out of range\n"); |
err = AVERROR_INVALIDDATA; |
} |
|
*recodes = huff.values; |
|
error: |
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, ret; |
|
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_bits8(&gb, smk->avctx->extradata + 16, smk->avctx->extradata_size - 16); |
|
if(!get_bits1(&gb)) { |
av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n"); |
smk->mmap_tbl = av_malloc(sizeof(int) * 2); |
if (!smk->mmap_tbl) |
return AVERROR(ENOMEM); |
smk->mmap_tbl[0] = 0; |
smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1; |
} else { |
ret = smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size); |
if (ret < 0) |
return ret; |
} |
if(!get_bits1(&gb)) { |
av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n"); |
smk->mclr_tbl = av_malloc(sizeof(int) * 2); |
if (!smk->mclr_tbl) |
return AVERROR(ENOMEM); |
smk->mclr_tbl[0] = 0; |
smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1; |
} else { |
ret = smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size); |
if (ret < 0) |
return ret; |
} |
if(!get_bits1(&gb)) { |
av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n"); |
smk->full_tbl = av_malloc(sizeof(int) * 2); |
if (!smk->full_tbl) |
return AVERROR(ENOMEM); |
smk->full_tbl[0] = 0; |
smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1; |
} else { |
ret = smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size); |
if (ret < 0) |
return ret; |
} |
if(!get_bits1(&gb)) { |
av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n"); |
smk->type_tbl = av_malloc(sizeof(int) * 2); |
if (!smk->type_tbl) |
return AVERROR(ENOMEM); |
smk->type_tbl[0] = 0; |
smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1; |
} else { |
ret = smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size); |
if (ret < 0) |
return ret; |
} |
|
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, ret; |
int stride; |
int flags; |
|
if (avpkt->size <= 769) |
return AVERROR_INVALIDDATA; |
|
if ((ret = ff_reget_buffer(avctx, smk->pic)) < 0) |
return ret; |
|
/* 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++ = 0xFFU << 24 | 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); |
if ((ret = init_get_bits8(&gb, avpkt->data + 769, avpkt->size - 769)) < 0) |
return ret; |
|
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; |
} |
|
} |
|
if ((ret = av_frame_ref(data, smk->pic)) < 0) |
return ret; |
|
*got_frame = 1; |
|
/* always report that the buffer was completely consumed */ |
return avpkt->size; |
} |
|
|
|
/* |
* |
* 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); |
|
av_frame_free(&smk->pic); |
|
return 0; |
} |
|
|
/* |
* |
* Init smacker decoder |
* |
*/ |
static av_cold int decode_init(AVCodecContext *avctx) |
{ |
SmackVContext * const c = avctx->priv_data; |
int ret; |
|
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 AVERROR(EINVAL); |
} |
|
ret = decode_header_trees(c); |
if (ret < 0) { |
decode_end(avctx); |
return ret; |
} |
|
c->pic = av_frame_alloc(); |
if (!c->pic) |
return AVERROR(ENOMEM); |
|
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); |
|
if (unp_size > (1U<<24)) { |
av_log(avctx, AV_LOG_ERROR, "packet is too big\n"); |
return AVERROR_INVALIDDATA; |
} |
|
if ((ret = init_get_bits8(&gb, buf + 4, buf_size - 4)) < 0) |
return ret; |
|
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)) < 0) |
return ret; |
samples = (int16_t *)frame->data[0]; |
samples8 = frame->data[0]; |
|
// Initialize |
for(i = 0; i < (1 << (bits + stereo)); i++) { |
h[i].length = 256; |
h[i].maxlength = 0; |
h[i].current = 0; |
h[i].bits = av_mallocz(256 * 4); |
h[i].lengths = av_mallocz(256 * sizeof(int)); |
h[i].values = av_mallocz(256 * sizeof(int)); |
if (!h[i].bits || !h[i].lengths || !h[i].values) { |
ret = AVERROR(ENOMEM); |
goto error; |
} |
skip_bits1(&gb); |
if (smacker_decode_tree(&gb, &h[i], 0, 0) < 0) { |
ret = AVERROR_INVALIDDATA; |
goto error; |
} |
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"); |
ret = AVERROR_INVALIDDATA; |
goto error; |
} |
} |
} |
/* this codec relies on wraparound instead of clipping audio */ |
if(bits) { //decode 16-bit data |
for(i = stereo; i >= 0; i--) |
pred[i] = sign_extend(av_bswap16(get_bits(&gb, 16)), 16); |
for(i = 0; i <= stereo; i++) |
*samples++ = pred[i]; |
for(; i < unp_size / 2; i++) { |
if(get_bits_left(&gb)<0) |
return AVERROR_INVALIDDATA; |
if(i & stereo) { |
if(vlc[2].table) |
res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3); |
else |
res = 0; |
if (res < 0) { |
av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
return AVERROR_INVALIDDATA; |
} |
val = h[2].values[res]; |
if(vlc[3].table) |
res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3); |
else |
res = 0; |
if (res < 0) { |
av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
return AVERROR_INVALIDDATA; |
} |
val |= h[3].values[res] << 8; |
pred[1] += sign_extend(val, 16); |
*samples++ = pred[1]; |
} else { |
if(vlc[0].table) |
res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); |
else |
res = 0; |
if (res < 0) { |
av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
return AVERROR_INVALIDDATA; |
} |
val = h[0].values[res]; |
if(vlc[1].table) |
res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); |
else |
res = 0; |
if (res < 0) { |
av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
return AVERROR_INVALIDDATA; |
} |
val |= h[1].values[res] << 8; |
pred[0] += sign_extend(val, 16); |
*samples++ = pred[0]; |
} |
} |
} else { //8-bit data |
for(i = stereo; i >= 0; i--) |
pred[i] = get_bits(&gb, 8); |
for(i = 0; i <= stereo; i++) |
*samples8++ = pred[i]; |
for(; i < unp_size; i++) { |
if(get_bits_left(&gb)<0) |
return AVERROR_INVALIDDATA; |
if(i & stereo){ |
if(vlc[1].table) |
res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); |
else |
res = 0; |
if (res < 0) { |
av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
return AVERROR_INVALIDDATA; |
} |
pred[1] += sign_extend(h[1].values[res], 8); |
*samples8++ = pred[1]; |
} else { |
if(vlc[0].table) |
res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); |
else |
res = 0; |
if (res < 0) { |
av_log(avctx, AV_LOG_ERROR, "invalid vlc\n"); |
return AVERROR_INVALIDDATA; |
} |
pred[0] += sign_extend(h[0].values[res], 8); |
*samples8++ = pred[0]; |
} |
} |
} |
|
*got_frame_ptr = 1; |
ret = buf_size; |
|
error: |
for(i = 0; i < 4; i++) { |
if(vlc[i].table) |
ff_free_vlc(&vlc[i]); |
av_free(h[i].bits); |
av_free(h[i].lengths); |
av_free(h[i].values); |
} |
|
return ret; |
} |
|
AVCodec ff_smacker_decoder = { |
.name = "smackvid", |
.long_name = NULL_IF_CONFIG_SMALL("Smacker video"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_SMACKVIDEO, |
.priv_data_size = sizeof(SmackVContext), |
.init = decode_init, |
.close = decode_end, |
.decode = decode_frame, |
.capabilities = CODEC_CAP_DR1, |
}; |
|
AVCodec ff_smackaud_decoder = { |
.name = "smackaud", |
.long_name = NULL_IF_CONFIG_SMALL("Smacker audio"), |
.type = AVMEDIA_TYPE_AUDIO, |
.id = AV_CODEC_ID_SMACKAUDIO, |
.init = smka_decode_init, |
.decode = smka_decode_frame, |
.capabilities = CODEC_CAP_DR1, |
}; |