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audio/format: add function for determining sample conversion candidates

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This commit is contained in:
wm4 2015-09-10 23:30:51 +02:00
parent e45f469280
commit 60a617df31
2 changed files with 32 additions and 0 deletions
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31
audio/format.c
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@ -211,6 +211,37 @@ int af_format_conversion_score(int dst_format, int src_format)
return score;
}
struct entry {
int fmt;
int score;
};
static int cmp_entry(const void *a, const void *b)
{
#define CMP_INT(a, b) (a > b ? 1 : (a < b ? -1 : 0))
return -CMP_INT(((struct entry *)a)->score, ((struct entry *)b)->score);
}
// Return a list of sample format compatible to src_format, sorted by order
// of preference. out_formats[0] will be src_format (as long as it's valid),
// and the list is terminated with 0 (AF_FORMAT_UNKNOWN).
// Keep in mind that this also returns formats with flipped interleaving
// (e.g. for s16, it returns [s16, s16p, ...]).
void af_get_best_sample_formats(int src_format, int out_formats[AF_FORMAT_COUNT])
{
int num = 0;
struct entry e[AF_FORMAT_COUNT];
for (int fmt = 1; fmt < AF_FORMAT_COUNT; fmt++) {
int score = af_format_conversion_score(fmt, src_format);
if (score > INT_MIN)
e[num++] = (struct entry){fmt, score};
}
qsort(e, num, sizeof(e[0]), cmp_entry);
for (int n = 0; n < num; n++)
out_formats[n] = e[n].fmt;
out_formats[num] = 0;
}
// Return the number of samples that make up one frame in this format.
// You get the byte size by multiplying them with sample size and channel count.
int af_format_sample_alignment(int format)

1
audio/format.h
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@ -76,6 +76,7 @@ int af_fmt_seconds_to_bytes(int format, float seconds, int channels, int sampler
void af_fill_silence(void *dst, size_t bytes, int format);
int af_format_conversion_score(int dst_format, int src_format);
void af_get_best_sample_formats(int src_format, int out_formats[AF_FORMAT_COUNT]);
int af_format_sample_alignment(int format);