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Diffstat (limited to 'stack/a2dp/a2d_aac.c')
| -rw-r--r-- | stack/a2dp/a2d_aac.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/stack/a2dp/a2d_aac.c b/stack/a2dp/a2d_aac.c new file mode 100644 index 000000000..d299e00cb --- /dev/null +++ b/stack/a2dp/a2d_aac.c @@ -0,0 +1,175 @@ +/****************************************************************************** + * + * Copyright (c) 2016, The Linux Foundation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials provided + * with the distribution. + * * Neither the name of The Linux Foundation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE + * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN + * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + ******************************************************************************/ +/****************************************************************************** + * + * Utility functions to help build and parse AAC Codec Information + * + ******************************************************************************/ + +#include "bt_target.h" +#include <string.h> +#include "a2d_api.h" +#include "a2d_int.h" +#include "a2d_aac.h" +#include "bt_utils.h" + +#if (A2D_M24_INCLUDED == TRUE) +static UINT8 A2D_UINT32_BitsSet(UINT32 num); +/****************************************************************************** +** +** Function A2D_BldAacInfo +** +** Description This function builds byte sequence for +** Aac Codec Capabilities. +** Input : media_type: Audio or MultiMedia. +** p_ie: AAC Codec Information Element +** +** Output : p_result: codec info. +** +** Returns A2D_SUCCESS if successful. +** Error otherwise. +******************************************************************************/ +tA2D_STATUS A2D_BldAacInfo(UINT8 media_type, tA2D_AAC_CIE *p_ie, UINT8 *p_result) +{ + tA2D_STATUS status; + if( p_ie == NULL || p_result == NULL || + (p_ie->object_type & ~A2D_AAC_IE_OBJ_TYPE_MSK) || + (p_ie->samp_freq & ~A2D_AAC_IE_SAMP_FREQ_MSK) || + (p_ie->channels & ~A2D_AAC_IE_CHANNELS_MSK) || + (p_ie->bit_rate & ~A2D_AAC_IE_BIT_RATE_MSK) || + (p_ie->vbr & ~A2D_AAC_IE_VBR_MSK) ) + { + /* return invalid params if invalid bit is set */ + status = A2D_INVALID_PARAMS; + } + else + { + status = A2D_SUCCESS; + *p_result++ = A2D_AAC_INFO_LEN; + *p_result++ = media_type; + *p_result++ = A2D_MEDIA_CT_M24; + + /* Codec information */ + *p_result++ = p_ie->object_type; // object type + + *p_result++ = (UINT8)(p_ie->samp_freq >> 8); + + *p_result++ = (p_ie->samp_freq & 0x00F0)|p_ie->channels; + *p_result++ = p_ie->vbr | ((p_ie->bit_rate >> 16)& 0x007F); + *p_result++ = (p_ie->bit_rate >> 8)& 0x00FF; + *p_result = p_ie->bit_rate & 0x000000FF; + } + return status; +} + +/****************************************************************************** +** +** Function A2D_ParsAacInfo +** +** Description This function parse byte sequence for +** Aac Codec Capabilities. +** Input : p_info: input byte sequence. +** for_caps: True for getcap, false otherwise +** +** Output : p_ie: Aac codec information. +** +** Returns A2D_SUCCESS if successful. +** Error otherwise. +******************************************************************************/ +tA2D_STATUS A2D_ParsAacInfo(tA2D_AAC_CIE *p_ie, UINT8 *p_info, BOOLEAN for_caps) +{ + tA2D_STATUS status; + UINT8 losc; + UINT8 media_type; + + if( p_ie == NULL || p_info == NULL) + status = A2D_INVALID_PARAMS; + else + { + losc = *p_info++; + media_type = *p_info++; + /* Check for wrong length, media type */ + if(losc != A2D_AAC_INFO_LEN || *p_info != A2D_MEDIA_CT_M24) + status = A2D_WRONG_CODEC; + else + { + p_info++; + /* obj type */ + p_ie->object_type = *p_info & A2D_AAC_IE_OBJ_TYPE_MSK; p_info++; + /* samping freq */ + p_ie->samp_freq = *p_info; p_info++; + p_ie->samp_freq = p_ie->samp_freq << 8; + p_ie->samp_freq |= (*p_info & 0xF0); + /* channels */ + p_ie->channels = *p_info & A2D_AAC_IE_CHANNELS_MSK; p_info++; + /* variable bit rate */ + p_ie->vbr = *p_info & A2D_AAC_IE_VBR_MSK; + /* bit rate */ + p_ie->bit_rate = *p_info & 0x7F;p_ie->bit_rate = p_ie->bit_rate << 8; p_info++; + p_ie->bit_rate |= *p_info;p_ie->bit_rate = p_ie->bit_rate << 8; p_info++; + p_ie->bit_rate |= *p_info; + status = A2D_SUCCESS; + + if(for_caps == FALSE) + { + if(A2D_UINT32_BitsSet(p_ie->object_type) != A2D_SET_ONE_BIT) + status = A2D_BAD_OBJ_TYPE; + if(A2D_UINT32_BitsSet(p_ie->samp_freq) != A2D_SET_ONE_BIT) + status = A2D_BAD_SAMP_FREQ; + if(A2D_UINT32_BitsSet(p_ie->channels) != A2D_SET_ONE_BIT) + status = A2D_BAD_CHANNEL; + } + } + } + return status; +} +/****************************************************************************** +** Function A2D_UINT32_BitsSet +** +** Description Check the given number of 32bit for the number of bits set +** Returns A2D_SET_ONE_BIT, if one and only one bit is set +** A2D_SET_ZERO_BIT, if all bits clear +** A2D_SET_MULTL_BIT, if multiple bits are set +******************************************************************************/ +static UINT8 A2D_UINT32_BitsSet(UINT32 num) +{ + UINT8 count; + BOOLEAN res; + if(num == 0) + res = A2D_SET_ZERO_BIT; + else + { + count = (num & (num - 1)); + res = ((count==0)?A2D_SET_ONE_BIT:A2D_SET_MULTL_BIT); + } + return res; +} +#endif /* A2D_M24_INCLUDED == TRUE */ |