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avformat/isom: Simplify mov_rewrite_dvd_sub_extradata()

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This avoids the 2nd buffer and fixes the palette truncated check

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-03-17 17:06:30 +01:00
parent b1eb92a6bc
commit f6f3c85c0e
1 changed files with 8 additions and 10 deletions
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18
libavformat/isom.c
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@ -26,6 +26,7 @@
#include "isom.h"
#include "libavcodec/mpeg4audio.h"
#include "libavcodec/mpegaudiodata.h"
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
/* http://www.mp4ra.org */
@ -456,28 +457,25 @@ static uint32_t yuv_to_rgba(uint32_t ycbcr)
static int mov_rewrite_dvd_sub_extradata(AVStream *st)
{
char pal_s[256];
char buf[256];
int pal_s_pos = 0;
char buf[256] = {0};
uint8_t *src = st->codec->extradata;
int i;
if (st->codec->extradata_size != 64)
return 0;
snprintf(buf, sizeof(buf), "size: %dx%d\npalette: ",
st->codec->width, st->codec->height);
for (i = 0; i < 16; i++) {
uint32_t yuv = AV_RB32(src + i * 4);
uint32_t rgba = yuv_to_rgba(yuv);
snprintf(pal_s + pal_s_pos, sizeof(pal_s) - pal_s_pos, "%06x%s", rgba,
i != 15 ? ", " : "");
pal_s_pos = strlen(pal_s);
if (pal_s_pos >= sizeof(pal_s))
return 0;
av_strlcatf(buf, sizeof(buf), "%06x%s", rgba, i != 15 ? ", " : "");
}
snprintf(buf, sizeof(buf), "size: %dx%d\npalette: %s\n",
st->codec->width, st->codec->height, pal_s);
if (av_strlcat(buf, "\n", sizeof(buf)) >= sizeof(buf))
return 0;
av_freep(&st->codec->extradata);
st->codec->extradata_size = 0;