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ffmpeg.wasm-core
Commit 0afcf97e authored by Alexandra Khirnova's avatar Alexandra Khirnova Committed by Anton Khirnov
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vmdav: convert to bytestream2 

Signed-off-by: 's avatarAnton Khirnov <anton@khirnov.net>
parent 8a2f5f0c
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Showing with 59 additions and 93 deletions
libavcodec/vmdav.c
View file @ 0afcf97e
......@@ -48,6 +48,7 @@
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "internal.h"
#include "bytestream.h"
#define VMD_HEADER_SIZE 0x330
#define PALETTE_COUNT 256
......@@ -77,8 +78,6 @@ typedef struct VmdVideoContext {
static void lz_unpack(const unsigned char *src, int src_len,
unsigned char *dest, int dest_len)
{
const unsigned char *s;
unsigned int s_len;
unsigned char *d;
unsigned char *d_end;
unsigned char queue[QUEUE_SIZE];
......@@ -89,18 +88,17 @@ static void lz_unpack(const unsigned char *src, int src_len,
unsigned int speclen;
unsigned char tag;
unsigned int i, j;
GetByteContext gb;
s = src;
s_len = src_len;
bytestream2_init(&gb, src, src_len);
d = dest;
d_end = d + dest_len;
dataleft = AV_RL32(s);
s += 4; s_len -= 4;
dataleft = bytestream2_get_le32(&gb);
memset(queue, 0x20, QUEUE_SIZE);
if (s_len < 4)
if (bytestream2_get_bytes_left(&gb) < 4)
return;
if (AV_RL32(s) == 0x56781234) {
s += 4; s_len -= 4;
if (bytestream2_peek_le32(&gb) == 0x56781234) {
bytestream2_get_le32(&gb);
qpos = 0x111;
speclen = 0xF + 3;
} else {
......@@ -108,40 +106,32 @@ static void lz_unpack(const unsigned char *src, int src_len,
speclen = 100; /* no speclen */
}
while (dataleft > 0 && s_len > 0) {
tag = *s++; s_len--;
while (dataleft > 0 && bytestream2_get_bytes_left(&gb) > 0) {
tag = bytestream2_get_byteu(&gb);
if ((tag == 0xFF) && (dataleft > 8)) {
if (d + 8 > d_end || s_len < 8)
if (d + 8 > d_end || bytestream2_get_bytes_left(&gb) < 8)
return;
for (i = 0; i < 8; i++) {
queue[qpos++] = *d++ = *s++;
queue[qpos++] = *d++ = bytestream2_get_byteu(&gb);
qpos &= QUEUE_MASK;
}
s_len -= 8;
dataleft -= 8;
} else {
for (i = 0; i < 8; i++) {
if (dataleft == 0)
break;
if (tag & 0x01) {
if (d + 1 > d_end || s_len < 1)
if (d + 1 > d_end || bytestream2_get_bytes_left(&gb) < 1)
return;
queue[qpos++] = *d++ = *s++;
queue[qpos++] = *d++ = bytestream2_get_byte(&gb);
qpos &= QUEUE_MASK;
dataleft--;
s_len--;
} else {
if (s_len < 2)
return;
chainofs = *s++;
chainofs |= ((*s & 0xF0) << 4);
chainlen = (*s++ & 0x0F) + 3;
s_len -= 2;
chainofs = bytestream2_get_byte(&gb);
chainofs |= ((bytestream2_peek_byte(&gb) & 0xF0) << 4);
chainlen = (bytestream2_get_byte(&gb) & 0x0F) + 3;
if (chainlen == speclen) {
if (s_len < 1)
return;
chainlen = *s++ + 0xF + 3;
s_len--;
chainlen = bytestream2_get_byte(&gb) + 0xF + 3;
}
if (d + chainlen > d_end)
return;
......@@ -161,49 +151,44 @@ static void lz_unpack(const unsigned char *src, int src_len,
static int rle_unpack(const unsigned char *src, unsigned char *dest,
int src_count, int src_size, int dest_len)
{
const unsigned char *ps;
unsigned char *pd;
int i, l;
unsigned char *dest_end = dest + dest_len;
GetByteContext gb;
ps = src;
bytestream2_init(&gb, src, src_size);
pd = dest;
if (src_count & 1) {
if (src_size < 1)
if (bytestream2_get_bytes_left(&gb) < 1)
return 0;
*pd++ = *ps++;
src_size--;
*pd++ = bytestream2_get_byteu(&gb);
}
src_count >>= 1;
i = 0;
do {
if (src_size < 1)
if (bytestream2_get_bytes_left(&gb) < 1)
break;
l = *ps++;
src_size--;
l = bytestream2_get_byteu(&gb);
if (l & 0x80) {
l = (l & 0x7F) * 2;
if (pd + l > dest_end || src_size < l)
return ps - src;
memcpy(pd, ps, l);
ps += l;
src_size -= l;
if (pd + l > dest_end || bytestream2_get_bytes_left(&gb) < l)
return bytestream2_tell(&gb);
bytestream2_get_buffer(&gb, pd, l);
pd += l;
} else {
if (pd + i > dest_end || src_size < 2)
return ps - src;
if (pd + i > dest_end || bytestream2_get_bytes_left(&gb) < 2)
return bytestream2_tell(&gb);
for (i = 0; i < l; i++) {
*pd++ = ps[0];
*pd++ = ps[1];
*pd++ = bytestream2_get_byteu(&gb);
*pd++ = bytestream2_get_byteu(&gb);
}
ps += 2;
src_size -= 2;
bytestream2_skip(&gb, 2);
}
i += l;
} while (i < src_count);
return ps - src;
return bytestream2_tell(&gb);
}
static void vmd_decode(VmdVideoContext *s, AVFrame *frame)
......@@ -212,11 +197,8 @@ static void vmd_decode(VmdVideoContext *s, AVFrame *frame)
unsigned int *palette32;
unsigned char r, g, b;
/* point to the start of the encoded data */
const unsigned char *p = s->buf + 16;
GetByteContext gb;
const unsigned char *pb;
unsigned int pb_size;
unsigned char meth;
unsigned char *dp; /* pointer to current frame */
unsigned char *pp; /* pointer to previous frame */
......@@ -261,30 +243,31 @@ static void vmd_decode(VmdVideoContext *s, AVFrame *frame)
}
/* check if there is a new palette */
bytestream2_init(&gb, s->buf + 16, s->size - 16);
if (s->buf[15] & 0x02) {
p += 2;
bytestream2_skip(&gb, 2);
palette32 = (unsigned int *)s->palette;
for (i = 0; i < PALETTE_COUNT; i++) {
r = *p++ * 4;
g = *p++ * 4;
b = *p++ * 4;
palette32[i] = (r << 16) | (g << 8) | (b);
if (bytestream2_get_bytes_left(&gb) >= PALETTE_COUNT * 3) {
for (i = 0; i < PALETTE_COUNT; i++) {
r = bytestream2_get_byteu(&gb) * 4;
g = bytestream2_get_byteu(&gb) * 4;
b = bytestream2_get_byteu(&gb) * 4;
palette32[i] = (r << 16) | (g << 8) | (b);
}
}
s->size -= (256 * 3 + 2);
}
if (s->size > 0) {
/* originally UnpackFrame in VAG's code */
pb = p;
pb_size = s->buf + s->size - pb;
if (pb_size < 1)
bytestream2_init(&gb, gb.buffer, s->buf + s->size - gb.buffer);
if (bytestream2_get_bytes_left(&gb) < 1)
return;
meth = *pb++; pb_size--;
meth = bytestream2_get_byteu(&gb);
if (meth & 0x80) {
lz_unpack(pb, pb_size,
lz_unpack(gb.buffer, bytestream2_get_bytes_left(&gb),
s->unpack_buffer, s->unpack_buffer_size);
meth &= 0x7F;
pb = s->unpack_buffer;
pb_size = s->unpack_buffer_size;
bytestream2_init(&gb, s->unpack_buffer, s->unpack_buffer_size);
}
dp = &frame->data[0][frame_y * frame->linesize[0] + frame_x];
......@@ -294,17 +277,12 @@ static void vmd_decode(VmdVideoContext *s, AVFrame *frame)
for (i = 0; i < frame_height; i++) {
ofs = 0;
do {
if (pb_size < 1)
return;
len = *pb++;
pb_size--;
len = bytestream2_get_byte(&gb);
if (len & 0x80) {
len = (len & 0x7F) + 1;
if (ofs + len > frame_width || pb_size < len)
if (ofs + len > frame_width || bytestream2_get_bytes_left(&gb) < len)
return;
memcpy(&dp[ofs], pb, len);
pb += len;
pb_size -= len;
bytestream2_get_buffer(&gb, &dp[ofs], len);
ofs += len;
} else {
/* interframe pixel copy */
......@@ -326,11 +304,7 @@ static void vmd_decode(VmdVideoContext *s, AVFrame *frame)
case 2:
for (i = 0; i < frame_height; i++) {
if (pb_size < frame_width)
return;
memcpy(dp, pb, frame_width);
pb += frame_width;
pb_size -= frame_width;
bytestream2_get_buffer(&gb, dp, frame_width);
dp += frame->linesize[0];
pp += s->prev_frame.linesize[0];
}
......@@ -340,24 +314,16 @@ static void vmd_decode(VmdVideoContext *s, AVFrame *frame)
for (i = 0; i < frame_height; i++) {
ofs = 0;
do {
if (pb_size < 1)
return;
len = *pb++;
pb_size--;
len = bytestream2_get_byte(&gb);
if (len & 0x80) {
len = (len & 0x7F) + 1;
if (pb_size < 1)
return;
if (*pb++ == 0xFF)
len = rle_unpack(pb, &dp[ofs], len, pb_size, frame_width - ofs);
else {
if (pb_size < len)
return;
memcpy(&dp[ofs], pb, len);
}
pb += len;
pb_size -= 1 + len;
ofs += len;
if (bytestream2_get_byte(&gb) == 0xFF)
len = rle_unpack(gb.buffer, &dp[ofs],
len, bytestream2_get_bytes_left(&gb),
frame_width - ofs);
else
bytestream2_get_buffer(&gb, &dp[ofs], len);
bytestream2_skip(&gb, len);
} else {
/* interframe pixel copy */
if (ofs + len + 1 > frame_width || !s->prev_frame.data[0])
......
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