diff options
Diffstat (limited to 'audio/filter/af_tools.c')
| -rw-r--r-- | audio/filter/af_tools.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/audio/filter/af_tools.c b/audio/filter/af_tools.c index 77638ed9d6..c5f423ebf9 100644 --- a/audio/filter/af_tools.c +++ b/audio/filter/af_tools.c @@ -23,7 +23,7 @@ #include "af.h" /* Convert to gain value from dB. Returns AF_OK if of and AF_ERROR if - fail */ + * fail. input <= -200dB will become 0 gain. */ int af_from_dB(int n, float* in, float* out, float k, float mi, float ma) { int i = 0; @@ -41,7 +41,7 @@ int af_from_dB(int n, float* in, float* out, float k, float mi, float ma) } /* Convert from gain value to dB. Returns AF_OK if of and AF_ERROR if - fail */ + * fail. gain=0 will become -200 dB. k is just a multiplier. */ int af_to_dB(int n, float* in, float* out, float k) { int i = 0; @@ -86,7 +86,18 @@ int af_to_ms(int n, int* in, float* out, int rate) return AF_OK; } -/* Helper function for testing the output format */ +/* + * test if output format matches + * af: audio filter + * out: needed format, will be overwritten by available + * format if they do not match + * returns: AF_FALSE if formats do not match, AF_OK if they match + * + * compares the format, rate and nch values of af->data with out + * Note: logically, *out=*af->data always happens, because out contains the + * format only, no actual audio data or memory allocations. *out always + * contains the parameters from af->data after the function returns. + */ int af_test_output(struct af_instance* af, struct mp_audio* out) { if((af->data->format != out->format) || |