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Remove unused data conversion functions from usb hal

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Change-Id: I4ccf8441171ad796e8954b1960f76411ebb86e9d
This commit is contained in:
Andy Hung 2015-05-07 17:48:38 -07:00
parent 182ddc7d13
commit f90f8f8ada
1 changed files with 0 additions and 68 deletions
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68
modules/usbaudio/audio_hal.c
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@ -123,74 +123,6 @@ struct stream_in {
size_t conversion_buffer_size; /* in bytes */
};
/*
* Data Conversions
*/
/*
* Convert a buffer of packed (3-byte) PCM24LE samples to PCM16LE samples.
* in_buff points to the buffer of PCM24LE samples
* num_in_samples size of input buffer in SAMPLES
* out_buff points to the buffer to receive converted PCM16LE LE samples.
* returns
* the number of BYTES of output data.
* We are doing this since we *always* present to The Framework as A PCM16LE device, but need to
* support PCM24_3LE (24-bit, packed).
* NOTE:
* This conversion is safe to do in-place (in_buff == out_buff).
* TODO Move this to a utilities module.
*/
static size_t convert_24_3_to_16(const unsigned char * in_buff, size_t num_in_samples,
short * out_buff)
{
/*
* Move from front to back so that the conversion can be done in-place
* i.e. in_buff == out_buff
*/
/* we need 2 bytes in the output for every 3 bytes in the input */
unsigned char* dst_ptr = (unsigned char*)out_buff;
const unsigned char* src_ptr = in_buff;
size_t src_smpl_index;
for (src_smpl_index = 0; src_smpl_index < num_in_samples; src_smpl_index++) {
src_ptr++; /* lowest-(skip)-byte */
*dst_ptr++ = *src_ptr++; /* low-byte */
*dst_ptr++ = *src_ptr++; /* high-byte */
}
/* return number of *bytes* generated: */
return num_in_samples * 2;
}
/*
* Convert a buffer of packed (3-byte) PCM32 samples to PCM16LE samples.
* in_buff points to the buffer of PCM32 samples
* num_in_samples size of input buffer in SAMPLES
* out_buff points to the buffer to receive converted PCM16LE LE samples.
* returns
* the number of BYTES of output data.
* We are doing this since we *always* present to The Framework as A PCM16LE device, but need to
* support PCM_FORMAT_S32_LE (32-bit).
* NOTE:
* This conversion is safe to do in-place (in_buff == out_buff).
* TODO Move this to a utilities module.
*/
static size_t convert_32_to_16(const int32_t * in_buff, size_t num_in_samples, short * out_buff)
{
/*
* Move from front to back so that the conversion can be done in-place
* i.e. in_buff == out_buff
*/
short * dst_ptr = out_buff;
const int32_t* src_ptr = in_buff;
size_t src_smpl_index;
for (src_smpl_index = 0; src_smpl_index < num_in_samples; src_smpl_index++) {
*dst_ptr++ = *src_ptr++ >> 16;
}
/* return number of *bytes* generated: */
return num_in_samples * 2;
}
/*
* Extract the card and device numbers from the supplied key/value pairs.
* kvpairs A null-terminated string containing the key/value pairs or card and device.