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ffmpeg.wasm-core
Commit 4fccc7c4 authored by Laurentiu Ion's avatar Laurentiu Ion Committed by Justin Ruggles
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vb: Use bytestream2 functions 

Signed-off-by: 's avatarJustin Ruggles <justin.ruggles@gmail.com>
parent 4cd0bdae
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Showing with 27 additions and 48 deletions
libavcodec/vb.c
View file @ 4fccc7c4
......@@ -44,7 +44,7 @@ typedef struct VBDecContext {
uint8_t *frame, *prev_frame;
uint32_t pal[AVPALETTE_COUNT];
const uint8_t *stream;
GetByteContext stream;
} VBDecContext;
static const uint16_t vb_patterns[64] = {
......@@ -62,8 +62,8 @@ static void vb_decode_palette(VBDecContext *c, int data_size)
{
int start, size, i;
start = bytestream_get_byte(&c->stream);
size = (bytestream_get_byte(&c->stream) - 1) & 0xFF;
start = bytestream2_get_byte(&c->stream);
size = (bytestream2_get_byte(&c->stream) - 1) & 0xFF;
if(start + size > 255){
av_log(c->avctx, AV_LOG_ERROR, "Palette change runs beyond entry 256\n");
return;
......@@ -73,7 +73,7 @@ static void vb_decode_palette(VBDecContext *c, int data_size)
return;
}
for(i = start; i <= start + size; i++)
c->pal[i] = bytestream_get_be24(&c->stream);
c->pal[i] = bytestream2_get_be24(&c->stream);
}
static inline int check_pixel(uint8_t *buf, uint8_t *start, uint8_t *end)
......@@ -86,10 +86,10 @@ static inline int check_line(uint8_t *buf, uint8_t *start, uint8_t *end)
return buf >= start && (buf + 4) <= end;
}
static int vb_decode_framedata(VBDecContext *c, const uint8_t *buf, int data_size, int offset)
static int vb_decode_framedata(VBDecContext *c, int offset)
{
GetByteContext g;
uint8_t *prev, *cur;
const uint8_t* data_end = buf + data_size;
int blk, blocks, t, blk2;
int blocktypes = 0;
int x, y, a, b;
......@@ -98,6 +98,8 @@ static int vb_decode_framedata(VBDecContext *c, const uint8_t *buf, int data_siz
uint8_t *pstart = c->prev_frame;
uint8_t *pend = c->prev_frame + width*c->avctx->height;
g = c->stream;
prev = c->prev_frame + offset;
cur = c->frame;
......@@ -105,11 +107,7 @@ static int vb_decode_framedata(VBDecContext *c, const uint8_t *buf, int data_siz
blk2 = 0;
for(blk = 0; blk < blocks; blk++){
if(!(blk & 3)) {
if(buf >= data_end){
av_log(c->avctx, AV_LOG_ERROR, "Data pointer out of bounds\n");
return -1;
}
blocktypes = bytestream_get_byte(&buf);
blocktypes = bytestream2_get_byte(&g);
}
switch(blocktypes & 0xC0){
case 0x00: //skip
......@@ -120,15 +118,14 @@ static int vb_decode_framedata(VBDecContext *c, const uint8_t *buf, int data_siz
memset(cur + y*width, 0, 4);
break;
case 0x40:
t = bytestream_get_byte(&buf);
t = bytestream2_get_byte(&g);
if(!t){ //raw block
if(buf + 16 > data_end){
if (bytestream2_get_bytes_left(&g) < 16) {
av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
return -1;
}
for(y = 0; y < 4; y++)
memcpy(cur + y*width, buf + y*4, 4);
buf += 16;
bytestream2_get_buffer(&g, cur + y * width, 4);
}else{ // motion compensation
x = ((t & 0xF)^8) - 8;
y = ((t >> 4) ^8) - 8;
......@@ -141,22 +138,18 @@ static int vb_decode_framedata(VBDecContext *c, const uint8_t *buf, int data_siz
}
break;
case 0x80: // fill
t = bytestream_get_byte(&buf);
t = bytestream2_get_byte(&g);
for(y = 0; y < 4; y++)
memset(cur + y*width, t, 4);
break;
case 0xC0: // pattern fill
if(buf + 2 > data_end){
av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
return -1;
}
t = bytestream_get_byte(&buf);
t = bytestream2_get_byte(&g);
pattype = t >> 6;
pattern = vb_patterns[t & 0x3F];
switch(pattype){
case 0:
a = bytestream_get_byte(&buf);
b = bytestream_get_byte(&buf);
a = bytestream2_get_byte(&g);
b = bytestream2_get_byte(&g);
for(y = 0; y < 4; y++)
for(x = 0; x < 4; x++, pattern >>= 1)
cur[x + y*width] = (pattern & 1) ? b : a;
......@@ -164,7 +157,7 @@ static int vb_decode_framedata(VBDecContext *c, const uint8_t *buf, int data_siz
case 1:
pattern = ~pattern;
case 2:
a = bytestream_get_byte(&buf);
a = bytestream2_get_byte(&g);
for(y = 0; y < 4; y++)
for(x = 0; x < 4; x++, pattern >>= 1)
if(pattern & 1 && check_pixel(prev + x + y*width, pstart, pend))
......@@ -193,16 +186,15 @@ static int vb_decode_framedata(VBDecContext *c, const uint8_t *buf, int data_siz
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
VBDecContext * const c = avctx->priv_data;
uint8_t *outptr, *srcptr;
int i, j;
int flags;
uint32_t size;
int rest = buf_size;
int offset = 0;
bytestream2_init(&c->stream, avpkt->data, avpkt->size);
if(c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
c->pic.reference = 1;
......@@ -211,34 +203,21 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
return -1;
}
c->stream = buf;
flags = bytestream_get_le16(&c->stream);
rest -= 2;
flags = bytestream2_get_le16(&c->stream);
if(flags & VB_HAS_GMC){
i = (int16_t)bytestream_get_le16(&c->stream);
j = (int16_t)bytestream_get_le16(&c->stream);
i = (int16_t)bytestream2_get_le16(&c->stream);
j = (int16_t)bytestream2_get_le16(&c->stream);
offset = i + j * avctx->width;
rest -= 4;
}
if(flags & VB_HAS_VIDEO){
size = bytestream_get_le32(&c->stream);
if(size > rest){
av_log(avctx, AV_LOG_ERROR, "Frame size is too big\n");
return -1;
}
vb_decode_framedata(c, c->stream, size, offset);
c->stream += size - 4;
rest -= size;
size = bytestream2_get_le32(&c->stream);
vb_decode_framedata(c, offset);
bytestream2_skip(&c->stream, size - 4);
}
if(flags & VB_HAS_PALETTE){
size = bytestream_get_le32(&c->stream);
if(size > rest){
av_log(avctx, AV_LOG_ERROR, "Palette size is too big\n");
return -1;
}
size = bytestream2_get_le32(&c->stream);
vb_decode_palette(c, size);
rest -= size;
}
memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE);
......@@ -259,7 +238,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
*(AVFrame*)data = c->pic;
/* always report that the buffer was completely consumed */
return buf_size;
return avpkt->size;
}
static av_cold int decode_init(AVCodecContext *avctx)
......
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