float _af_format_sample_size (const AudioFormat *fmt, bool stretch3to4)
{
const CompressionUnit *unit = _af_compression_unit_from_id(fmt->compressionType);
float squishFactor = unit->squishFactor;
return _af_format_sample_size_uncompressed(fmt, stretch3to4) /
squishFactor;
}
float _af_format_sample_size (_AudioFormat *fmt, bool stretch3to4)
{
int compressionIndex;
float squishFactor;
compressionIndex = _af_compression_index_from_id(fmt->compressionType);
squishFactor = _af_compression[compressionIndex].squishFactor;
return _af_format_sample_size_uncompressed(fmt, stretch3to4) /
squishFactor;
}
/*
Set the sampleFormat and sampleWidth fields in f, and set the
PCM info to the appropriate default values for the given sample
format and sample width.
*/
status _af_set_sample_format (AudioFormat *f, int sampleFormat, int sampleWidth)
{
switch (sampleFormat)
{
case AF_SAMPFMT_UNSIGNED:
case AF_SAMPFMT_TWOSCOMP:
if (sampleWidth < 1 || sampleWidth > 32)
{
_af_error(AF_BAD_SAMPFMT,
"illegal sample width %d for integer data",
sampleWidth);
return AF_FAIL;
}
else
{
int bytes;
f->sampleFormat = sampleFormat;
f->sampleWidth = sampleWidth;
bytes = _af_format_sample_size_uncompressed(f, false);
if (sampleFormat == AF_SAMPFMT_TWOSCOMP)
f->pcm = _af_default_signed_integer_pcm_mappings[bytes];
else
f->pcm = _af_default_unsigned_integer_pcm_mappings[bytes];
}
break;
case AF_SAMPFMT_FLOAT:
f->sampleFormat = sampleFormat;
f->sampleWidth = 32;
f->pcm = _af_default_float_pcm_mapping;
break;
case AF_SAMPFMT_DOUBLE:
f->sampleFormat = sampleFormat;
f->sampleWidth = 64; /*for convenience */
f->pcm = _af_default_double_pcm_mapping;
break;
default:
_af_error(AF_BAD_SAMPFMT, "unknown sample format %d",
sampleFormat);
return AF_FAIL;
}
return AF_SUCCEED;
}
int _af_format_frame_size_uncompressed (const AudioFormat *fmt, bool stretch3to4)
{
return _af_format_sample_size_uncompressed(fmt, stretch3to4) *
fmt->channelCount;
}
