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Code Issues Releases Activity

dvdsubdec: Convert to the new bitstream reader

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Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Alexandra Hájková 2016-04-09 19:05:56 +02:00 committed by Anton Khirnov
parent 928f8c7ce3
commit d8618570be
1 changed files with 17 additions and 17 deletions
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34
libavcodec/dvdsubdec.c
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@ -20,7 +20,7 @@
*/
#include "avcodec.h"
#include "get_bits.h"
#include "bitstream.h"
#include "internal.h"
#include "libavutil/attributes.h"
@ -50,13 +50,13 @@ static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *
}
}
static int decode_run_2bit(GetBitContext *gb, int *color)
static int decode_run_2bit(BitstreamContext *bc, int *color)
{
unsigned int v, t;
v = 0;
for (t = 1; v < t && t <= 0x40; t <<= 2)
v = (v << 4) | get_bits(gb, 4);
v = (v << 4) | bitstream_read(bc, 4);
*color = v & 3;
if (v < 4) { /* Code for fill rest of line */
return INT_MAX;
@ -64,23 +64,23 @@ static int decode_run_2bit(GetBitContext *gb, int *color)
return v >> 2;
}
static int decode_run_8bit(GetBitContext *gb, int *color)
static int decode_run_8bit(BitstreamContext *bc, int *color)
{
int len;
int has_run = get_bits1(gb);
if (get_bits1(gb))
*color = get_bits(gb, 8);
int has_run = bitstream_read_bit(bc);
if (bitstream_read_bit(bc))
*color = bitstream_read(bc, 8);
else
*color = get_bits(gb, 2);
*color = bitstream_read(bc, 2);
if (has_run) {
if (get_bits1(gb)) {
len = get_bits(gb, 7);
if (bitstream_read_bit(bc)) {
len = bitstream_read(bc, 7);
if (len == 0)
len = INT_MAX;
else
len += 9;
} else
len = get_bits(gb, 3) + 2;
len = bitstream_read(bc, 3) + 2;
} else
len = 1;
return len;
@ -89,24 +89,24 @@ static int decode_run_8bit(GetBitContext *gb, int *color)
static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
const uint8_t *buf, int start, int buf_size, int is_8bit)
{
GetBitContext gb;
BitstreamContext bc;
int bit_len;
int x, y, len, color;
uint8_t *d;
bit_len = (buf_size - start) * 8;
init_get_bits(&gb, buf + start, bit_len);
bitstream_init(&bc, buf + start, bit_len);
x = 0;
y = 0;
d = bitmap;
for(;;) {
if (get_bits_count(&gb) > bit_len)
if (bitstream_tell(&bc) > bit_len)
return -1;
if (is_8bit)
len = decode_run_8bit(&gb, &color);
len = decode_run_8bit(&bc, &color);
else
len = decode_run_2bit(&gb, &color);
len = decode_run_2bit(&bc, &color);
len = FFMIN(len, w - x);
memset(d + x, color, len);
x += len;
@ -117,7 +117,7 @@ static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
d += linesize;
x = 0;
/* byte align */
align_get_bits(&gb);
bitstream_align(&bc);
}
}
return 0;