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lavc: Prettify printing of codec tags containing non alphanumeric characters

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Make av_get_codec_tag_string() show codec tag string characters in a more
intelligible ways. For example the ascii char "@" is used as a number, so
should be displayed like "[64]" rather than as a printable character.

Apart alphanumeric chars, only the characters ' ' and '.' are used
literally in codec tags, all the other characters represent numbers.

This also avoids relying on locale-dependent character class functions.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Stefano Sabatini 2012-05-26 01:38:03 +02:00 committed by Martin Storsjö
parent d65522e826
commit 70762508ec
1 changed files with 6 additions and 1 deletions
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7
libavcodec/utils.c
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@ -1562,9 +1562,14 @@ size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_ta
{
int i, len, ret = 0;
#define TAG_PRINT(x) \
(((x) >= '0' && (x) <= '9') || \
((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z') || \
((x) == '.' || (x) == ' '))
for (i = 0; i < 4; i++) {
len = snprintf(buf, buf_size,
isprint(codec_tag & 0xFF) ? "%c" : "[%d]", codec_tag & 0xFF);
TAG_PRINT(codec_tag & 0xFF) ? "%c" : "[%d]", codec_tag & 0xFF);
buf += len;
buf_size = buf_size > len ? buf_size - len : 0;
ret += len;