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jpeg2000: Define the maximum decomposition levels

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And define the resolution levels according.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Luca Barbato
2013-07-01 10:01:00 +02:00
parent fbcc03db8f
commit be3271009e
2 changed files with 6 additions and 4 deletions
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8
libavcodec/jpeg2000.h
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@@ -67,7 +67,9 @@ enum Jpeg2000Quantsty { // quantization style
#define JPEG2000_MAX_CBLKW 64
#define JPEG2000_MAX_CBLKH 64
#define JPEG2000_MAX_RESLEVELS 33
#define JPEG2000_MAX_DECLEVELS 32
#define JPEG2000_MAX_RESLEVELS (JPEG2000_MAX_DECLEVELS + 1)
// T1 flags
// flags determining significance of neighbor coefficients
@@ -145,8 +147,8 @@ typedef struct Jpeg2000CodingStyle {
} Jpeg2000CodingStyle;
typedef struct Jpeg2000QuantStyle {
uint8_t expn[32 * 3]; // quantization exponent
uint32_t mant[32 * 3]; // quantization mantissa
uint8_t expn[JPEG2000_MAX_DECLEVELS * 3]; // quantization exponent
uint32_t mant[JPEG2000_MAX_DECLEVELS * 3]; // quantization mantissa
uint8_t quantsty; // quantization style
uint8_t nguardbits; // number of guard bits
} Jpeg2000QuantStyle;

2
libavcodec/jpeg2000dec.c
View File

@@ -367,7 +367,7 @@ static int get_qcx(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q)
x = bytestream_get_be16(&s->buf);
q->expn[0] = x >> 11;
q->mant[0] = x & 0x7ff;
for (i = 1; i < 32 * 3; i++) {
for (i = 1; i < JPEG2000_MAX_DECLEVELS * 3; i++) {
int curexpn = FFMAX(0, q->expn[0] - (i - 1) / 3);
q->expn[i] = curexpn;
q->mant[i] = q->mant[0];