/******************************************************************************
*
* Copyright 2004-2012 Broadcom Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/******************************************************************************
*
* This module contains utility functions for dealing with SBC data frames
* and codec capabilities.
*
******************************************************************************/
#include "a2dp_sbc_up_sample.h"
typedef int(tA2DP_SBC_ACT)(void* p_src, void* p_dst, uint32_t src_samples,
uint32_t dst_samples, uint32_t* p_ret);
typedef struct {
int32_t cur_pos; /* current position */
uint32_t src_sps; /* samples per second (source audio data) */
uint32_t dst_sps; /* samples per second (converted audio data) */
tA2DP_SBC_ACT* p_act; /* the action function to do the conversion */
uint8_t bits; /* number of bits per pcm sample */
uint8_t n_channels; /* number of channels (i.e. mono(1), stereo(2)...) */
int16_t worker1;
int16_t worker2;
uint8_t div;
} tA2DP_SBC_UPS_CB;
tA2DP_SBC_UPS_CB a2dp_sbc_ups_cb;
/*******************************************************************************
*
* Function a2dp_sbc_init_up_sample
*
* Description initialize the up sample
*
* src_sps: samples per second (source audio data)
* dst_sps: samples per second (converted audio data)
* bits: number of bits per pcm sample
* n_channels: number of channels (i.e. mono(1), stereo(2)...)
*
* Returns none
*
******************************************************************************/
void a2dp_sbc_init_up_sample(uint32_t src_sps, uint32_t dst_sps, uint8_t bits,
uint8_t n_channels) {
a2dp_sbc_ups_cb.cur_pos = -1;
a2dp_sbc_ups_cb.src_sps = src_sps;
a2dp_sbc_ups_cb.dst_sps = dst_sps;
a2dp_sbc_ups_cb.bits = bits;
a2dp_sbc_ups_cb.n_channels = n_channels;
if (n_channels == 1) {
/* mono */
if (bits == 8) {
a2dp_sbc_ups_cb.p_act = a2dp_sbc_up_sample_8m;
a2dp_sbc_ups_cb.div = 1;
} else {
a2dp_sbc_ups_cb.p_act = a2dp_sbc_up_sample_16m;
a2dp_sbc_ups_cb.div = 2;
}
} else {
/* stereo */
if (bits == 8) {
a2dp_sbc_ups_cb.p_act = a2dp_sbc_up_sample_8s;
a2dp_sbc_ups_cb.div = 2;
} else {
a2dp_sbc_ups_cb.p_act = a2dp_sbc_up_sample_16s;
a2dp_sbc_ups_cb.div = 4;
}
}
}
/*******************************************************************************
*
* Function a2dp_sbc_up_sample
*
* Description Given the source (p_src) audio data and
* source speed (src_sps, samples per second),
* This function converts it to audio data in the desired
* format
*
* p_src: the data buffer that holds the source audio data
* p_dst: the data buffer to hold the converted audio data
* src_samples: The number of source samples (number of bytes)
* dst_samples: The size of p_dst (number of bytes)
*
* Note: An AE reported an issue with this function.
* When called with a2dp_sbc_up_sample(src, uint8_array_dst..)
* the byte before uint8_array_dst may get overwritten.
* Using uint16_array_dst avoids the problem.
* This issue is related to endian-ness and is hard to resolve
* in a generic manner.
* **************** Please use uint16 array as dst.
*
* Returns The number of bytes used in p_dst
* The number of bytes used in p_src (in *p_ret)
*
******************************************************************************/
int a2dp_sbc_up_sample(void* p_src, void* p_dst, uint32_t src_samples,
uint32_t dst_samples, uint32_t* p_ret) {
uint32_t src;
uint32_t dst;
if (a2dp_sbc_ups_cb.p_act) {
src = src_samples / a2dp_sbc_ups_cb.div;
dst = dst_samples / a2dp_sbc_ups_cb.div;
return (*a2dp_sbc_ups_cb.p_act)(p_src, p_dst, src, dst, p_ret);
} else {
*p_ret = 0;
return 0;
}
}
/*******************************************************************************
*
* Function a2dp_sbc_up_sample_16s (16bits-stereo)
*
* Description Given the source (p_src) audio data and
* source speed (src_sps, samples per second),
* This function converts it to audio data in the desired
* format
*
* p_src: the data buffer that holds the source audio data
* p_dst: the data buffer to hold the converted audio data
* src_samples: The number of source samples (in uint of 4
* bytes)
* dst_samples: The size of p_dst (in uint of 4 bytes)
*
* Returns The number of bytes used in p_dst
* The number of bytes used in p_src (in *p_ret)
*
******************************************************************************/
int a2dp_sbc_up_sample_16s(void* p_src, void* p_dst, uint32_t src_samples,
uint32_t dst_samples, uint32_t* p_ret) {
int16_t* p_src_tmp = (int16_t*)p_src;
int16_t* p_dst_tmp = (int16_t*)p_dst;
int16_t* p_worker1 = &a2dp_sbc_ups_cb.worker1;
int16_t* p_worker2 = &a2dp_sbc_ups_cb.worker2;
uint32_t src_sps = a2dp_sbc_ups_cb.src_sps;
uint32_t dst_sps = a2dp_sbc_ups_cb.dst_sps;
while (a2dp_sbc_ups_cb.cur_pos > 0 && dst_samples) {
*p_dst_tmp++ = *p_worker1;
*p_dst_tmp++ = *p_worker2;
a2dp_sbc_ups_cb.cur_pos -= src_sps;
dst_samples--;
}
a2dp_sbc_ups_cb.cur_pos = dst_sps;
while (src_samples-- && dst_samples) {
*p_worker1 = *p_src_tmp++;
*p_worker2 = *p_src_tmp++;
do {
*p_dst_tmp++ = *p_worker1;
*p_dst_tmp++ = *p_worker2;
a2dp_sbc_ups_cb.cur_pos -= src_sps;
dst_samples--;
} while (a2dp_sbc_ups_cb.cur_pos > 0 && dst_samples);
a2dp_sbc_ups_cb.cur_pos += dst_sps;
}
if (a2dp_sbc_ups_cb.cur_pos == (int32_t)dst_sps) a2dp_sbc_ups_cb.cur_pos = 0;
*p_ret = ((char*)p_src_tmp - (char*)p_src);
return ((char*)p_dst_tmp - (char*)p_dst);
}
/*******************************************************************************
*
* Function a2dp_sbc_up_sample_16m (16bits-mono)
*
* Description Given the source (p_src) audio data and
* source speed (src_sps, samples per second),
* This function converts it to audio data in the desired
* format
*
* p_src: the data buffer that holds the source audio data
* p_dst: the data buffer to hold the converted audio data
* src_samples: The number of source samples (in uint of 2
* bytes)
* dst_samples: The size of p_dst (in uint of 2 bytes)
*
* Returns The number of bytes used in p_dst
* The number of bytes used in p_src (in *p_ret)
*
******************************************************************************/
int a2dp_sbc_up_sample_16m(void* p_src, void* p_dst, uint32_t src_samples,
uint32_t dst_samples, uint32_t* p_ret) {
int16_t* p_src_tmp = (int16_t*)p_src;
int16_t* p_dst_tmp = (int16_t*)p_dst;
int16_t* p_worker = &a2dp_sbc_ups_cb.worker1;
uint32_t src_sps = a2dp_sbc_ups_cb.src_sps;
uint32_t dst_sps = a2dp_sbc_ups_cb.dst_sps;
while (a2dp_sbc_ups_cb.cur_pos > 0 && dst_samples) {
*p_dst_tmp++ = *p_worker;
*p_dst_tmp++ = *p_worker;
a2dp_sbc_ups_cb.cur_pos -= src_sps;
dst_samples--;
dst_samples--;
}
a2dp_sbc_ups_cb.cur_pos = dst_sps;
while (src_samples-- && dst_samples) {
*p_worker = *p_src_tmp++;
do {
*p_dst_tmp++ = *p_worker;
*p_dst_tmp++ = *p_worker;
a2dp_sbc_ups_cb.cur_pos -= src_sps;
dst_samples--;
dst_samples--;
} while (a2dp_sbc_ups_cb.cur_pos > 0 && dst_samples);
a2dp_sbc_ups_cb.cur_pos += dst_sps;
}
if (a2dp_sbc_ups_cb.cur_pos == (int32_t)dst_sps) a2dp_sbc_ups_cb.cur_pos = 0;
*p_ret = ((char*)p_src_tmp - (char*)p_src);
return ((char*)p_dst_tmp - (char*)p_dst);
}
/*******************************************************************************
*
* Function a2dp_sbc_up_sample_8s (8bits-stereo)
*
* Description Given the source (p_src) audio data and
* source speed (src_sps, samples per second),
* This function converts it to audio data in the desired
* format
*
* p_src: the data buffer that holds the source audio data
* p_dst: the data buffer to hold the converted audio data
* src_samples: The number of source samples (in uint of 2
* bytes)
* dst_samples: The size of p_dst (in uint of 2 bytes)
*
* Returns The number of bytes used in p_dst
* The number of bytes used in p_src (in *p_ret)
*
******************************************************************************/
int a2dp_sbc_up_sample_8s(void* p_src, void* p_dst, uint32_t src_samples,
uint32_t dst_samples, uint32_t* p_ret) {
uint8_t* p_src_tmp = (uint8_t*)p_src;
int16_t* p_dst_tmp = (int16_t*)p_dst;
int16_t* p_worker1 = &a2dp_sbc_ups_cb.worker1;
int16_t* p_worker2 = &a2dp_sbc_ups_cb.worker2;
uint32_t src_sps = a2dp_sbc_ups_cb.src_sps;
uint32_t dst_sps = a2dp_sbc_ups_cb.dst_sps;
while (a2dp_sbc_ups_cb.cur_pos > 0 && dst_samples) {
*p_dst_tmp++ = *p_worker1;
*p_dst_tmp++ = *p_worker2;
a2dp_sbc_ups_cb.cur_pos -= src_sps;
dst_samples--;
dst_samples--;
}
a2dp_sbc_ups_cb.cur_pos = dst_sps;
while (src_samples-- && dst_samples) {
*p_worker1 = *(uint8_t*)p_src_tmp++;
*p_worker1 -= 0x80;
*p_worker1 <<= 8;
*p_worker2 = *(uint8_t*)p_src_tmp++;
*p_worker2 -= 0x80;
*p_worker2 <<= 8;
do {
*p_dst_tmp++ = *p_worker1;
*p_dst_tmp++ = *p_worker2;
a2dp_sbc_ups_cb.cur_pos -= src_sps;
dst_samples--;
dst_samples--;
} while (a2dp_sbc_ups_cb.cur_pos > 0 && dst_samples);
a2dp_sbc_ups_cb.cur_pos += dst_sps;
}
if (a2dp_sbc_ups_cb.cur_pos == (int32_t)dst_sps) a2dp_sbc_ups_cb.cur_pos = 0;
*p_ret = ((char*)p_src_tmp - (char*)p_src);
return ((char*)p_dst_tmp - (char*)p_dst);
}
/*******************************************************************************
*
* Function a2dp_sbc_up_sample_8m (8bits-mono)
*
* Description Given the source (p_src) audio data and
* source speed (src_sps, samples per second),
* This function converts it to audio data in the desired
* format
*
* p_src: the data buffer that holds the source audio data
* p_dst: the data buffer to hold the converted audio data
* src_samples: The number of source samples (number of bytes)
* dst_samples: The size of p_dst (number of bytes)
*
* Returns The number of bytes used in p_dst
* The number of bytes used in p_src (in *p_ret)
*
******************************************************************************/
int a2dp_sbc_up_sample_8m(void* p_src, void* p_dst, uint32_t src_samples,
uint32_t dst_samples, uint32_t* p_ret) {
uint8_t* p_src_tmp = (uint8_t*)p_src;
int16_t* p_dst_tmp = (int16_t*)p_dst;
int16_t* p_worker = &a2dp_sbc_ups_cb.worker1;
uint32_t src_sps = a2dp_sbc_ups_cb.src_sps;
uint32_t dst_sps = a2dp_sbc_ups_cb.dst_sps;
while (a2dp_sbc_ups_cb.cur_pos > 0 && dst_samples) {
*p_dst_tmp++ = *p_worker;
*p_dst_tmp++ = *p_worker;
a2dp_sbc_ups_cb.cur_pos -= src_sps;
dst_samples -= 4;
}
a2dp_sbc_ups_cb.cur_pos = dst_sps;
while (src_samples-- && dst_samples) {
*p_worker = *(uint8_t*)p_src_tmp++;
*p_worker -= 0x80;
*p_worker <<= 8;
do {
*p_dst_tmp++ = *p_worker;
*p_dst_tmp++ = *p_worker;
a2dp_sbc_ups_cb.cur_pos -= src_sps;
dst_samples -= 4;
} while (a2dp_sbc_ups_cb.cur_pos > 0 && dst_samples);
a2dp_sbc_ups_cb.cur_pos += dst_sps;
}
if (a2dp_sbc_ups_cb.cur_pos == (int32_t)dst_sps) a2dp_sbc_ups_cb.cur_pos = 0;
*p_ret = ((char*)p_src_tmp - (char*)p_src);
return ((char*)p_dst_tmp - (char*)p_dst);
}