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audio: add af_select_best_samplerate function

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This function chooses the best match to a given samplerate from a provided
list. This can be used, for example, by the ao to decide what samplerate to use
for output.
This commit is contained in:
Kevin Mitchell 2016-03-16 23:37:46 -07:00
parent a993cdc481
commit a0884c82a9
2 changed files with 32 additions and 0 deletions
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31
audio/format.c
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@ -245,6 +245,37 @@ void af_get_best_sample_formats(int src_format, int out_formats[AF_FORMAT_COUNT]
out_formats[num] = 0;
}
// Return the best match to src_samplerate from the list provided in the array
// *available, which must be terminated by 0, or itself NULL. If *available is
// empty or NULL, return a negative value. Exact match to src_samplerate is
// most preferred, followed by the lowest integer multiple, followed by the
// maximum of *available.
int af_select_best_samplerate(int src_samplerate, const int *available)
{
if (!available)
return -1;
int min_mult_rate = INT_MAX;
int max_rate = INT_MIN;
for (int i = 0; available[i]; i++) {
if (available[i] == src_samplerate)
return available[i];
if (!(available[i] % src_samplerate))
min_mult_rate = MPMIN(min_mult_rate, available[i]);
max_rate = MPMAX(max_rate, available[i]);
}
if (min_mult_rate < INT_MAX)
return min_mult_rate;
if (max_rate > INT_MIN)
return max_rate;
return -1;
}
// 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
View File

@ -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);
void af_get_best_sample_formats(int src_format, int out_formats[AF_FORMAT_COUNT]);
int af_select_best_samplerate(int src_sampelrate, const int *available);
int af_format_sample_alignment(int format);