* Smacker decoder
* Copyright (c) 2006 Konstantin Shishkov
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * 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.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/smacker.c
+ * @file
* Smacker decoder
*/
#include <stdio.h>
#include <stdlib.h>
-#include "avcodec.h"
+#include "libavutil/channel_layout.h"
-#define ALT_BITSTREAM_READER_LE
-#include "get_bits.h"
+#define BITSTREAM_READER_LE
+#include "avcodec.h"
+#include "bitstream.h"
#include "bytestream.h"
+#include "internal.h"
+#include "mathops.h"
+#include "vlc.h"
#define SMKTREE_BITS 9
#define SMK_NODE 0x80000000
-/*
- * Decoder context
- */
+
typedef struct SmackVContext {
AVCodecContext *avctx;
- AVFrame pic;
+ AVFrame *pic;
int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;
int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
/**
* Decode local frame tree
*/
-static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
+static int smacker_decode_tree(BitstreamContext *bc, HuffContext *hc,
+ uint32_t prefix, int length)
{
- if(!get_bits1(gb)){ //Leaf
+ if (!bitstream_read_bit(bc)) { // Leaf
if(hc->current >= 256){
av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
if(length){
hc->bits[hc->current] = prefix;
hc->bits[hc->current] = 0;
hc->lengths[hc->current] = 0;
}
- hc->values[hc->current] = get_bits(gb, 8);
+ hc->values[hc->current] = bitstream_read(bc, 8);
hc->current++;
if(hc->maxlength < length)
hc->maxlength = length;
} else { //Node
int r;
length++;
- r = smacker_decode_tree(gb, hc, prefix, length);
+ r = smacker_decode_tree(bc, hc, prefix, length);
if(r)
return r;
- return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length);
+ return smacker_decode_tree(bc, hc, prefix | (1 << (length - 1)), length);
}
}
/**
* Decode header tree
*/
-static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx)
+static int smacker_decode_bigtree(BitstreamContext *bc, 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;
+ if (hc->current + 1 >= hc->length) {
+ av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
+ return AVERROR_INVALIDDATA;
+ }
+ if (!bitstream_read_bit(bc)) { // Leaf
+ int val, i1, i2;
+ i1 = ctx->v1->table ? bitstream_read_vlc(bc, ctx->v1->table, SMKTREE_BITS, 3) : 0;
+ i2 = ctx->v2->table ? bitstream_read_vlc(bc, 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;
hc->values[hc->current++] = val;
return 1;
} else { //Node
- int r = 0, t;
+ int r = 0, r_new, t;
t = hc->current++;
- r = smacker_decode_bigtree(gb, hc, ctx);
+ r = smacker_decode_bigtree(bc, hc, ctx);
if(r < 0)
return r;
hc->values[t] = SMK_NODE | r;
r++;
- r += smacker_decode_bigtree(gb, hc, ctx);
- return r;
+ r_new = smacker_decode_bigtree(bc, hc, ctx);
+ if (r_new < 0)
+ return r_new;
+ return r + r_new;
}
}
/**
- * Store large tree as FFmpeg's vlc codes
+ * Store large tree as Libav's vlc codes
*/
-static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
+static int smacker_decode_header_tree(SmackVContext *smk, BitstreamContext *bc,
+ int **recodes, int *last, int size)
{
int res;
HuffContext huff;
HuffContext tmp1, tmp2;
- VLC vlc[2];
+ 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;
+ return AVERROR_INVALIDDATA;
}
tmp1.length = 256;
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;
+ }
- memset(&vlc[0], 0, sizeof(VLC));
- memset(&vlc[1], 0, sizeof(VLC));
-
- if(get_bits1(gb)) {
- smacker_decode_tree(gb, &tmp1, 0, 0);
- skip_bits1(gb);
+ if (bitstream_read_bit(bc)) {
+ smacker_decode_tree(bc, &tmp1, 0, 0);
+ bitstream_skip(bc, 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");
- return -1;
+ err = res;
+ goto error;
}
} 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);
+ if (bitstream_read_bit(bc)) {
+ smacker_decode_tree(bc, &tmp2, 0, 0);
+ bitstream_skip(bc, 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");
- return -1;
+ err = res;
+ goto error;
}
} 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;
+ escapes[0] = bitstream_read(bc, 8);
+ escapes[0] |= bitstream_read(bc, 8) << 8;
+ escapes[1] = bitstream_read(bc, 8);
+ escapes[1] |= bitstream_read(bc, 8) << 8;
+ escapes[2] = bitstream_read(bc, 8);
+ escapes[2] |= bitstream_read(bc, 8) << 8;
last[0] = last[1] = last[2] = -1;
ctx.recode2 = tmp2.values;
ctx.last = last;
- huff.length = ((size + 3) >> 2) + 3;
+ 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;
+ }
- smacker_decode_bigtree(gb, &huff, &ctx);
- skip_bits1(gb);
+ if ((res = smacker_decode_bigtree(bc, &huff, &ctx)) < 0)
+ err = res;
+ bitstream_skip(bc, 1);
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)
- free_vlc(&vlc[0]);
+ ff_free_vlc(&vlc[0]);
if(vlc[1].table)
- free_vlc(&vlc[1]);
+ ff_free_vlc(&vlc[1]);
av_free(tmp1.bits);
av_free(tmp1.lengths);
av_free(tmp1.values);
av_free(tmp2.lengths);
av_free(tmp2.values);
- return 0;
+ return err;
}
static int decode_header_trees(SmackVContext *smk) {
- GetBitContext gb;
- int mmap_size, mclr_size, full_size, type_size;
+ BitstreamContext bc;
+ 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_bits(&gb, smk->avctx->extradata + 16, (smk->avctx->extradata_size - 16) * 8);
+ bitstream_init8(&bc, smk->avctx->extradata + 16, smk->avctx->extradata_size - 16);
- if(!get_bits1(&gb)) {
+ if (!bitstream_read_bit(&bc)) {
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 {
- smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size);
+ if ((ret = smacker_decode_header_tree(smk, &bc, &smk->mmap_tbl, smk->mmap_last, mmap_size)) < 0)
+ return ret;
}
- if(!get_bits1(&gb)) {
+ if (!bitstream_read_bit(&bc)) {
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 {
- smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size);
+ if ((ret = smacker_decode_header_tree(smk, &bc, &smk->mclr_tbl, smk->mclr_last, mclr_size)) < 0)
+ return ret;
}
- if(!get_bits1(&gb)) {
+ if (!bitstream_read_bit(&bc)) {
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 {
- smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size);
+ if ((ret = smacker_decode_header_tree(smk, &bc, &smk->full_tbl, smk->full_last, full_size)) < 0)
+ return ret;
}
- if(!get_bits1(&gb)) {
+ if (!bitstream_read_bit(&bc)) {
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 {
- smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size);
+ if ((ret = smacker_decode_header_tree(smk, &bc, &smk->type_tbl, smk->type_last, type_size)) < 0)
+ return ret;
}
return 0;
}
/* get code and update history */
-static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
+static av_always_inline int smk_get_code(BitstreamContext *bc, int *recode,
+ int *last)
+{
register int *table = recode;
- int v, b;
+ int v;
- b = get_bits_count(gb);
while(*table & SMK_NODE) {
- if(get_bits1(gb))
+ if (bitstream_read_bit(bc))
table += (*table) & (~SMK_NODE);
table++;
}
v = *table;
- b = get_bits_count(gb) - b;
if(v != recode[last[0]]) {
recode[last[2]] = recode[last[1]];
return v;
}
-static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
+static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+ AVPacket *avpkt)
{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
SmackVContext * const smk = avctx->priv_data;
uint8_t *out;
uint32_t *pal;
- GetBitContext gb;
+ GetByteContext gb2;
+ BitstreamContext bc;
int blocks, blk, bw, bh;
- int i;
+ int i, ret;
int stride;
+ int flags;
- if(buf_size <= 769)
+ if (avpkt->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){
+ if ((ret = ff_reget_buffer(avctx, smk->pic)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
+ return ret;
}
/* make the palette available on the way out */
- 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;
+ 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 = FF_P_TYPE;
+ smk->pic->pict_type = AV_PICTURE_TYPE_P;
- buf++;
for(i = 0; i < 256; i++)
- *pal++ = bytestream_get_be24(&buf);
- buf_size -= 769;
+ *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, buf, buf_size * 8);
+ bitstream_init8(&bc, avpkt->data + 769, avpkt->size - 769);
blk = 0;
bw = avctx->width >> 2;
bh = avctx->height >> 2;
blocks = bw * bh;
- out = smk->pic.data[0];
- stride = smk->pic.linesize[0];
+ 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);
+ type = smk_get_code(&bc, 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;
+ clr = smk_get_code(&bc, smk->mclr_tbl, smk->mclr_last);
+ map = smk_get_code(&bc, 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++) {
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;
+ if (bitstream_read_bit(&bc))
+ mode = 1;
+ else if (bitstream_read_bit(&bc))
+ mode = 2;
}
while(run-- && blk < blocks){
- out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
+ 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);
+ pix = smk_get_code(&bc, smk->full_tbl, smk->full_last);
AV_WL16(out+2,pix);
- pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
+ pix = smk_get_code(&bc, 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);
+ pix = smk_get_code(&bc, 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);
+ pix = smk_get_code(&bc, smk->full_tbl, smk->full_last);
out[0] = out[1] = pix & 0xFF;
out[2] = out[3] = pix >> 8;
out += stride;
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);
+ pix2 = smk_get_code(&bc, smk->full_tbl, smk->full_last);
+ pix1 = smk_get_code(&bc, smk->full_tbl, smk->full_last);
AV_WL16(out,pix1);
AV_WL16(out+2,pix2);
out += stride;
mode = type >> 8;
while(run-- && blk < blocks){
uint32_t col;
- out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
+ 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;
}
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = smk->pic;
+ if ((ret = av_frame_ref(data, smk->pic)) < 0)
+ return ret;
+
+ *got_frame = 1;
/* always report that the buffer was completely consumed */
- return buf_size;
+ return avpkt->size;
}
+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;
- c->pic.data[0] = NULL;
-
- if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
- return 1;
- }
-
- avctx->pix_fmt = PIX_FMT_PAL8;
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+ c->pic = av_frame_alloc();
+ if (!c->pic)
+ return AVERROR(ENOMEM);
/* decode huffman trees from extradata */
if(avctx->extradata_size < 16){
av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- decode_header_trees(c);
-
+ if ((ret = decode_header_trees(c))) {
+ decode_end(avctx);
+ return ret;
+ }
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)
{
- avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
+ if (avctx->channels < 1 || avctx->channels > 2) {
+ av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
+ return AVERROR_INVALIDDATA;
+ }
+ 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 *data_size, AVPacket *avpkt)
+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];
- VLC vlc[4];
- int16_t *samples = data;
- int8_t *samples8 = data;
+ BitstreamContext bc;
+ HuffContext h[4] = { { 0 } };
+ VLC vlc[4] = { { 0 } };
+ int16_t *samples;
+ uint8_t *samples8;
int val;
- int i, res;
+ 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_INVALIDDATA;
+ }
+
unp_size = AV_RL32(buf);
- init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
+ bitstream_init8(&bc, buf + 4, buf_size - 4);
- if(!get_bits1(&gb)){
+ if (!bitstream_read_bit(&bc)) {
av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
- *data_size = 0;
+ *got_frame_ptr = 0;
return 1;
}
- stereo = get_bits1(&gb);
- bits = get_bits1(&gb);
- if (unp_size & 0xC0000000 || unp_size > *data_size) {
- av_log(avctx, AV_LOG_ERROR, "Frame is too large to fit in buffer\n");
- return -1;
+ stereo = bitstream_read_bit(&bc);
+ bits = bitstream_read_bit(&bc);
+ if (stereo ^ (avctx->channels != 1)) {
+ av_log(avctx, AV_LOG_ERROR, "channels mismatch\n");
+ return AVERROR_INVALIDDATA;
+ }
+ if (bits && avctx->sample_fmt == AV_SAMPLE_FMT_U8) {
+ av_log(avctx, AV_LOG_ERROR, "sample format mismatch\n");
+ return AVERROR_INVALIDDATA;
}
+ if (unp_size % (avctx->channels * (bits + 1))) {
+ av_log(avctx, AV_LOG_ERROR,
+ "The buffer does not contain an integer number of samples\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* get output buffer */
+ frame->nb_samples = unp_size / (avctx->channels * (bits + 1));
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
+ }
+ samples = (int16_t *)frame->data[0];
+ samples8 = frame->data[0];
- 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].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].bits || !h[i].lengths || !h[i].values) {
+ ret = AVERROR(ENOMEM);
+ goto error;
+ }
+ bitstream_skip(&bc, 1);
+ if (smacker_decode_tree(&bc, &h[i], 0, 0) < 0) {
+ ret = AVERROR_INVALIDDATA;
+ goto error;
+ }
+ bitstream_skip(&bc, 1);
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;
+ 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] = bswap_16(get_bits(&gb, 16));
- for(i = 0; i < stereo; i++)
+ pred[i] = sign_extend(av_bswap16(bitstream_read(&bc, 16)), 16);
+ for(i = 0; i <= stereo; i++)
*samples++ = pred[i];
- for(i = 0; i < unp_size / 2; i++) {
+ for(; i < unp_size / 2; i++) {
if(i & stereo) {
if(vlc[2].table)
- res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
+ res = bitstream_read_vlc(&bc, 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);
+ res = bitstream_read_vlc(&bc, vlc[3].table, SMKTREE_BITS, 3);
else
res = 0;
val |= h[3].values[res] << 8;
- pred[1] += (int16_t)val;
+ pred[1] += sign_extend(val, 16);
*samples++ = pred[1];
} else {
if(vlc[0].table)
- res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
+ res = bitstream_read_vlc(&bc, 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);
+ res = bitstream_read_vlc(&bc, vlc[1].table, SMKTREE_BITS, 3);
else
res = 0;
val |= h[1].values[res] << 8;
- pred[0] += val;
+ 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++)
+ pred[i] = bitstream_read(&bc, 8);
+ for(i = 0; i <= stereo; i++)
*samples8++ = pred[i];
- for(i = 0; i < unp_size; i++) {
+ for(; i < unp_size; i++) {
if(i & stereo){
if(vlc[1].table)
- res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
+ res = bitstream_read_vlc(&bc, vlc[1].table, SMKTREE_BITS, 3);
else
res = 0;
- pred[1] += (int8_t)h[1].values[res];
+ 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);
+ res = bitstream_read_vlc(&bc, vlc[0].table, SMKTREE_BITS, 3);
else
res = 0;
- pred[0] += (int8_t)h[0].values[res];
+ 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)
- 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);
+ ff_free_vlc(&vlc[i]);
+ av_free(h[i].bits);
+ av_free(h[i].lengths);
+ av_free(h[i].values);
}
- *data_size = unp_size;
- return buf_size;
+ return ret;
}
-AVCodec smacker_decoder = {
- "smackvid",
- CODEC_TYPE_VIDEO,
- CODEC_ID_SMACKVIDEO,
- sizeof(SmackVContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("Smacker video"),
+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 = AV_CODEC_CAP_DR1,
};
-AVCodec smackaud_decoder = {
- "smackaud",
- CODEC_TYPE_AUDIO,
- CODEC_ID_SMACKAUDIO,
- 0,
- smka_decode_init,
- NULL,
- NULL,
- smka_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("Smacker audio"),
+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 = AV_CODEC_CAP_DR1,
};
-
projects / ffmpeg / blobdiff