233 lines
9 KiB
C
233 lines
9 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2002-2012 Broadcom Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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/******************************************************************************
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*
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* Utility functions to help build and parse SBC Codec Information Element
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* and Media Payload.
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*
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******************************************************************************/
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#include "common/bt_target.h"
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#include <string.h>
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#include "stack/a2d_api.h"
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#include "a2d_int.h"
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#include "stack/a2d_sbc.h"
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#include "common/bt_defs.h"
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#if (defined(A2D_INCLUDED) && A2D_INCLUDED == TRUE)
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/******************************************************************************
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**
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** Function A2D_BldSbcInfo
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**
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** Description This function is called by an application to build
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** the SBC Media Codec Capabilities byte sequence
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** beginning from the LOSC octet.
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** Input Parameters:
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** media_type: Indicates Audio, or Multimedia.
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**
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** p_ie: The SBC Codec Information Element information.
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**
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** Output Parameters:
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** p_result: the resulting codec info byte sequence.
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**
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** Returns A2D_SUCCESS if function execution succeeded.
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** Error status code, otherwise.
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******************************************************************************/
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tA2D_STATUS A2D_BldSbcInfo(UINT8 media_type, tA2D_SBC_CIE *p_ie, UINT8 *p_result)
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{
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tA2D_STATUS status;
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if ( p_ie == NULL || p_result == NULL ||
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(p_ie->samp_freq & ~A2D_SBC_IE_SAMP_FREQ_MSK) ||
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(p_ie->ch_mode & ~A2D_SBC_IE_CH_MD_MSK) ||
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(p_ie->block_len & ~A2D_SBC_IE_BLOCKS_MSK) ||
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(p_ie->num_subbands & ~A2D_SBC_IE_SUBBAND_MSK) ||
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(p_ie->alloc_mthd & ~A2D_SBC_IE_ALLOC_MD_MSK) ||
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(p_ie->max_bitpool < p_ie->min_bitpool) ||
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(p_ie->max_bitpool < A2D_SBC_IE_MIN_BITPOOL) ||
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(p_ie->max_bitpool > A2D_SBC_IE_MAX_BITPOOL) ||
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(p_ie->min_bitpool < A2D_SBC_IE_MIN_BITPOOL) ||
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(p_ie->min_bitpool > A2D_SBC_IE_MAX_BITPOOL) ) {
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/* if any unused bit is set */
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status = A2D_INVALID_PARAMS;
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} else {
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status = A2D_SUCCESS;
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*p_result++ = A2D_SBC_INFO_LEN;
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*p_result++ = media_type;
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*p_result++ = A2D_MEDIA_CT_SBC;
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/* Media Codec Specific Information Element */
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*p_result++ = p_ie->samp_freq | p_ie->ch_mode;
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*p_result++ = p_ie->block_len | p_ie->num_subbands | p_ie->alloc_mthd;
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*p_result++ = p_ie->min_bitpool;
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*p_result = p_ie->max_bitpool;
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}
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return status;
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}
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/******************************************************************************
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**
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** Function A2D_ParsSbcInfo
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**
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** Description This function is called by an application to parse
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** the SBC Media Codec Capabilities byte sequence
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** beginning from the LOSC octet.
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** Input Parameters:
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** p_info: the byte sequence to parse.
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**
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** for_caps: TRUE, if the byte sequence is for get capabilities response.
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**
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** Output Parameters:
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** p_ie: The SBC Codec Information Element information.
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**
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** Returns A2D_SUCCESS if function execution succeeded.
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** Error status code, otherwise.
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******************************************************************************/
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tA2D_STATUS A2D_ParsSbcInfo(tA2D_SBC_CIE *p_ie, UINT8 *p_info, BOOLEAN for_caps)
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{
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tA2D_STATUS status;
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UINT8 losc;
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if ( p_ie == NULL || p_info == NULL) {
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status = A2D_INVALID_PARAMS;
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} else {
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losc = *p_info++;
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p_info++;
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/* If the function is called for the wrong Media Type or Media Codec Type */
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if (losc != A2D_SBC_INFO_LEN || *p_info != A2D_MEDIA_CT_SBC) {
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status = A2D_WRONG_CODEC;
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} else {
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p_info++;
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p_ie->samp_freq = *p_info & A2D_SBC_IE_SAMP_FREQ_MSK;
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p_ie->ch_mode = *p_info & A2D_SBC_IE_CH_MD_MSK;
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p_info++;
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p_ie->block_len = *p_info & A2D_SBC_IE_BLOCKS_MSK;
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p_ie->num_subbands = *p_info & A2D_SBC_IE_SUBBAND_MSK;
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p_ie->alloc_mthd = *p_info & A2D_SBC_IE_ALLOC_MD_MSK;
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p_info++;
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p_ie->min_bitpool = *p_info++;
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p_ie->max_bitpool = *p_info;
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status = A2D_SUCCESS;
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if (p_ie->min_bitpool < A2D_SBC_IE_MIN_BITPOOL || p_ie->min_bitpool > A2D_SBC_IE_MAX_BITPOOL ) {
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status = A2D_BAD_MIN_BITPOOL;
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}
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if (p_ie->max_bitpool < A2D_SBC_IE_MIN_BITPOOL || p_ie->max_bitpool > A2D_SBC_IE_MAX_BITPOOL ||
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p_ie->max_bitpool < p_ie->min_bitpool) {
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status = A2D_BAD_MAX_BITPOOL;
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}
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if (for_caps == FALSE) {
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if (A2D_BitsSet(p_ie->samp_freq) != A2D_SET_ONE_BIT) {
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status = A2D_BAD_SAMP_FREQ;
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}
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if (A2D_BitsSet(p_ie->ch_mode) != A2D_SET_ONE_BIT) {
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status = A2D_BAD_CH_MODE;
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}
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if (A2D_BitsSet(p_ie->block_len) != A2D_SET_ONE_BIT) {
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status = A2D_BAD_BLOCK_LEN;
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}
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if (A2D_BitsSet(p_ie->num_subbands) != A2D_SET_ONE_BIT) {
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status = A2D_BAD_SUBBANDS;
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}
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if (A2D_BitsSet(p_ie->alloc_mthd) != A2D_SET_ONE_BIT) {
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status = A2D_BAD_ALLOC_MTHD;
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}
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}
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}
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}
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return status;
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}
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/******************************************************************************
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**
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** Function A2D_BldSbcMplHdr
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**
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** Description This function is called by an application to parse
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** the SBC Media Payload header.
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** Input Parameters:
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** frag: 1, if fragmented. 0, otherwise.
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**
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** start: 1, if the starting packet of a fragmented frame.
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**
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** last: 1, if the last packet of a fragmented frame.
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**
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** num: If frag is 1, this is the number of remaining fragments
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** (including this fragment) of this frame.
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** If frag is 0, this is the number of frames in this packet.
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**
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** Output Parameters:
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** p_dst: the resulting media payload header byte sequence.
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**
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** Returns void.
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******************************************************************************/
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void A2D_BldSbcMplHdr(UINT8 *p_dst, BOOLEAN frag, BOOLEAN start, BOOLEAN last, UINT8 num)
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{
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if (p_dst) {
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*p_dst = 0;
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if (frag) {
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*p_dst |= A2D_SBC_HDR_F_MSK;
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}
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if (start) {
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*p_dst |= A2D_SBC_HDR_S_MSK;
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}
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if (last) {
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*p_dst |= A2D_SBC_HDR_L_MSK;
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}
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*p_dst |= (A2D_SBC_HDR_NUM_MSK & num);
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}
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}
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/******************************************************************************
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**
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** Function A2D_ParsSbcMplHdr
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**
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** Description This function is called by an application to parse
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** the SBC Media Payload header.
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** Input Parameters:
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** p_src: the byte sequence to parse..
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**
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** Output Parameters:
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** frag: 1, if fragmented. 0, otherwise.
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**
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** start: 1, if the starting packet of a fragmented frame.
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**
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** last: 1, if the last packet of a fragmented frame.
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**
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** num: If frag is 1, this is the number of remaining fragments
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** (including this fragment) of this frame.
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** If frag is 0, this is the number of frames in this packet.
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**
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** Returns void.
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******************************************************************************/
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void A2D_ParsSbcMplHdr(UINT8 *p_src, BOOLEAN *p_frag, BOOLEAN *p_start, BOOLEAN *p_last, UINT8 *p_num)
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{
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if (p_src && p_frag && p_start && p_last && p_num) {
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*p_frag = (*p_src & A2D_SBC_HDR_F_MSK) ? TRUE : FALSE;
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*p_start = (*p_src & A2D_SBC_HDR_S_MSK) ? TRUE : FALSE;
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*p_last = (*p_src & A2D_SBC_HDR_L_MSK) ? TRUE : FALSE;
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*p_num = (*p_src & A2D_SBC_HDR_NUM_MSK);
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}
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}
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#endif /* #if (defined(A2D_INCLUDED) && A2D_INCLUDED == TRUE) */
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